CN114144613A

CN114144613A - Lighting device

Info

Publication number: CN114144613A
Application number: CN202080051662.5A
Authority: CN
Inventors: 山内哲; 白川友树; 船木那由太; 友田尚纪
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2019-07-19
Filing date: 2020-07-14
Publication date: 2022-03-04
Anticipated expiration: 2040-07-14
Also published as: WO2021015058A1; CN114144613B

Abstract

The lighting device (1) is provided with: a casing (10); a light source (22) fixed in the casing (10) and emitting light; a fixed lens (40) fixed in the casing (10) and having A light emitting surface (88) on the light emitting side of the light source (22) in the Z direction (optical axis direction); and a movable lens (60) having a projection light disposed on the light emitting side in the Z direction relative to the fixed lens (40) The surface (87) can vary in distance from the light source (22) in the Z direction. The light incident surface (86) of the fixed lens (40) is substantially flat, while the light exit surface (88) is convex. The first projection area of the orthographic projection of the fixed lens (40) on the vertical plane perpendicular to the Z direction is larger than the second projection area of the orthographic projection of the light source (22) on the vertical plane.

Description

Lighting device

Technical Field

The present disclosure relates to lighting devices.

Background

Conventionally, there is a structure described in patent document 1 as an illumination. The lighting device includes a base, a light source module, a 1 st cylindrical member, a 2 nd cylindrical member, a lens holder, and a lens. The base constitutes an upper side of the housing and has a plurality of fins on a side opposite to a light exit side. The light source module is fixed to an end surface (main surface) of the base on the light emitting side, and emits light to the opposite side of the optical axis direction from the fin side. The 1 st cylindrical member is fixed to the base so as not to be movable relative thereto. The 2 nd cylindrical member is attached to the 1 st cylindrical member so as to be relatively movable in the optical axis direction, and when rotated relative to the 1 st cylindrical member, the height position relative to the 1 st cylindrical member varies. The lens holder constitutes a lower side of a housing of the lighting device and is fixed to a radial outer side of the 2 nd cylindrical member so as not to be movable relative thereto. The lens is fixed to the inside of the lens holder so as not to be movable relative to the lens holder. The lens is located closer to the light exit side than the light source module in the optical axis direction. In this lighting device, the height position of the lens holder relative to the base can be varied by rotating the lens holder relative to the base, and the optical axis direction position of the lens relative to the light source module can be appropriately adjusted. Therefore, the narrow-angle performance of the emitted light can be adjusted, the degree of freedom of light distribution control can be increased, and desired light distribution can be easily achieved.

Documents of the prior art

Patent document

Patent document 1: japanese patent No. 6159460

Disclosure of Invention

Problems to be solved by the invention

In the above-described lighting device, if it is desired to improve the narrow-angle characteristic (characteristic in which the lens narrows the light distribution region at a position away from the light source), the center of the irradiation light tends to become dark (phenomenon in which the center of the irradiation region becomes dark) at a position in the optical axis direction of the middle-angle region of the lens. On the other hand, if the occurrence of the center darkening of the lens is to be suppressed, the narrow angle characteristic is likely to be deteriorated. Further, it is preferable that the light from the light source can be emitted to the irradiation region without loss.

Therefore, an object of the present disclosure is to provide an illumination device that easily realizes both good narrow-angle characteristics and suppression of center dimming, and that easily emits light from a light source to an irradiation region without loss.

Means for solving the problems

In order to solve the above problem, an illumination device according to the present disclosure includes: a housing; a light source fixed in the housing and emitting light; a movable lens whose distance from the light source in the optical axis direction can be varied; and a narrow-angle central darkening improvement mechanism capable of suppressing central darkening, in which the illuminance of the irradiation light emitted from the moving lens is lower at the central portion than at the peripheral portion of the irradiation surface, and suppressing a decrease in narrow-angle characteristics in which the area of the irradiation surface is reduced.

Further, an illumination device according to an embodiment of the present disclosure includes: a housing; a light source fixed in the housing and emitting light; a fixed lens fixed in the housing and having a light emitting surface positioned on a light emitting side in an optical axis direction with respect to the light source; and a movable lens having a light projecting surface disposed on a light emitting side in the optical axis direction with respect to the fixed lens, the movable lens being capable of varying a distance from the light source in the optical axis direction; the light incident surface of the fixed lens is substantially planar, while the light exit surface is convex; the 1 st projection area of the orthographic projection of the fixed lens on a vertical plane vertical to the optical axis direction is more than or equal to the 2 nd projection area of the orthographic projection of the light source on the vertical plane. The optical axis direction is a direction of the optical axis of the fixed lens and substantially coincides with a direction of the optical axis of the movable lens.

Effects of the invention

According to the illumination device of the present disclosure, both good narrow-angle characteristics and suppression of center dimming are easily achieved, and light from the light source is easily emitted to the irradiation region without loss.

Drawings

Fig. 1 is a perspective view of a lighting device according to embodiment 1 of the present disclosure.

Fig. 2 is a perspective view of the optical axis adjusting member of the illumination device.

Fig. 3 is an exploded perspective view of a main part of the lighting device.

Fig. 4 is a cross-sectional view of a cross-section including the optical axis direction of the main portion of the illumination device.

Fig. 5 is a perspective view of the fixed lens assembly mounted on the housing of the lighting device as viewed from the lower side.

Fig. 6 is a perspective view of the fixed lens of the lighting device.

Fig. 7 is a perspective view of a lens mounting member of the lighting device.

Fig. 8 is a perspective view showing the lens mounting member in a state where the fixed lens is placed on the upper side.

Fig. 9 is a perspective view of the fixed lens assembly of the lighting device.

Fig. 10 is a perspective view of the fixed lens unit to which the lens mounting member is attached, as viewed from the lower side.

Fig. 11 is a perspective view of the fixed lens assembly after the fixed lens is removed from the state shown in fig. 10 as viewed from the lower side.

Fig. 12 is a perspective view of the fixed lens assembly with the light source module removed, as viewed from the upper side.

Fig. 13 is a perspective view of the substrate holder holding the light source module when viewed from above.

Fig. 14 is a perspective view of an optical component composed of a lens holder and a moving lens held by the lens holder.

Fig. 15 is a perspective view of a lens holder of the lighting device.

Fig. 16 is a perspective view of the movable lens of the lighting device.

Fig. 17 is a perspective view of the rotating member of the lighting device.

Fig. 18 is a perspective view of a movable lens unit configured by integrally integrating an optical member and a rotating member.

Fig. 19 is a perspective view of the 1 st member of the housing of the lighting device.

Fig. 20 is a perspective view of the lighting device as viewed from a different angle from fig. 1.

Fig. 21 is a schematic sectional view for explaining the dimensions of the light source, the fixed lens, and the moving lens.

Fig. 22 (a) is a schematic view showing the light distribution at the narrow angle of the illumination device, (b) is a schematic view showing the light distribution at the narrow angle, at the middle angle, and at the wide angle of the illumination device of a reference example in which only the fixed lens is not present, and (c) is a schematic view showing the light distribution at the narrow angle, at the middle angle, and at the wide angle of the illumination device.

Fig. 23 is a perspective view of a lighting device according to embodiment 2 of the present disclosure.

Fig. 24 is an exploded perspective view of a main part of the lighting device of embodiment 2.

Fig. 25 is a perspective view of the housing of the illumination device of embodiment 2 as viewed from the light exit side.

Fig. 26 is a perspective view of a fixed lens assembly of the lighting device of embodiment 2.

Fig. 27 is a perspective view showing a state in which the fixed lens and the lens attachment member are removed from the fixed lens assembly shown in fig. 26.

Fig. 28 is a perspective view of the moving lens assembly of the lighting device of embodiment 2.

Fig. 29 is a perspective view of a C-shaped retainer ring of the lighting device according to embodiment 2.

Fig. 30 is a diagram illustrating a mounting structure of the rotating member to the housing according to embodiment 2.

Fig. 31 is a perspective view of the fixed lens of the illumination device according to embodiment 2 when viewed from the light exit side in the optical axis direction.

Fig. 32 is a schematic sectional view showing a light source module and a fixed lens of a lighting device that can be manufactured.

Fig. 33 is a perspective view of a lighting device according to embodiment 3 of the present disclosure.

Fig. 34 is a perspective view of the lighting device of embodiment 3 as viewed from another direction.

Fig. 35 is an exploded perspective view of a main part of the lighting device according to embodiment 3.

Fig. 36 is a perspective view of a movable lens unit incorporated with a C-shaped retainer ring included in the lighting apparatus according to embodiment 3.

Fig. 37 is a perspective view of the movable lens of the illumination device according to embodiment 3 when viewed from the light incident side.

Fig. 38 is a perspective view of the movable lens of the illumination device according to embodiment 3 as viewed from the light exit side.

Fig. 39 is a cross-sectional view of the moving lens of the illumination device according to embodiment 3 taken along a plane passing through the optical axis.

Fig. 40 is a perspective view of the housing of the illumination device according to embodiment 3 as viewed from the lower side in the optical axis direction.

Fig. 41 is a perspective view of a lens holder of the lighting device of embodiment 3.

Fig. 42 is a diagram illustrating a preferable dimensional relationship among the housing, the movable lens, and the lens holder, in the illumination device according to embodiment 3.

Fig. 43 is a perspective view of a lighting device according to embodiment 4 of the present disclosure.

Fig. 44 is an exploded perspective view of a main part of the lighting device according to embodiment 4.

Fig. 45 is a perspective view of a movable lens unit incorporated with a C-shaped retainer ring included in the lighting apparatus according to embodiment 4.

Fig. 46 is a perspective view of the movable lens of the illumination device according to embodiment 4 when viewed from the upper side in the optical axis direction.

Fig. 47 is a perspective view of the lighting device according to embodiment 4, in which the inner member to which the light source module is fixed is being fixed to the outer tube member, as viewed from the lower side of the outer tube member in the Z direction.

Fig. 48 is a perspective view of a lens holder of the lighting device according to embodiment 4.

Fig. 49 is a perspective view of the lighting device according to embodiment 4, illustrating the relative position of the light source module with respect to the movable lens, and is a perspective view of the movable lens and the light source module when viewed from the obliquely lower side of the movable lens.

Fig. 50 is a perspective view of the lighting device according to embodiment 4, illustrating the relative position of the light source module with respect to the movable lens, and is a plan view of the movable lens and the light source module when viewed from above in the Z direction.

Detailed Description

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. In addition, when a plurality of embodiments, modifications, and the like are included below, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the characteristic portions thereof. In the following embodiments, the same components are denoted by the same reference numerals in the drawings, and redundant description thereof is omitted. In addition, the dimensional ratios of the vertical, horizontal, and height of the respective members are not necessarily uniform between different drawings. In the drawings and the following description, the R direction is a radial direction of the

main body

41, 141 of the fixed

lens

40, 148 described below, and the θ direction is a circumferential direction of the

main body

41, 141 of the fixed

lens

40, 148. The Z direction is a direction of an optical axis of the fixed

lens

40 or 148 described below, and is substantially the same as the height direction of the

housing

10 or 130, and also substantially the extending direction of the central axis of the

movable lens

60 or 163, that is, the direction of the optical axis of the

movable lens

60 or 163. The R direction, the theta direction and the Z direction are orthogonal to each other.

In the following description, the upper side refers to the side opposite to the light exit side in the optical axis direction, and the lower side refers to the light exit side in the optical axis direction. Further, the inclined groove described below is defined as a configuration in which: the engaging portion is provided with a pair of inner side wall surfaces inclined with respect to the Z direction and opposed to each other, and at least a part of the engaging portion between the pair of inner side wall surfaces is guided by the pair of inner side wall surfaces, so that the engaging portion can move in the extending direction of the pair of inner side wall surfaces. Therefore, the inclined groove may have a bottom portion, but may have a structure having a through hole with an elongated long hole shape inclined with respect to the optical axis direction, such as the inclined groove 81 described below, and may penetrate the side wall of the rotating member or the optical member in the thickness direction. Among the constituent elements described below, those not recited in the independent claims representing the uppermost concept are arbitrary constituent elements and are not essential constituent elements. In the present specification, the term "substantially" is used in the same sense as the term "substantially", and the term "substantially" means that the term "substantially" is satisfied as long as a person looks substantially … …. For example, the substantially circular shape is sufficient if people look like a substantially circular shape.

(embodiment 1)

Fig. 1 is a perspective view of a lighting device 1 according to embodiment 1 of the present disclosure. As shown in fig. 1, the lighting device 1 is an embedded type general-purpose downlight, and is embedded in a ceiling of a building disposed in a hall or the like, and is capable of changing the optical axis direction of outgoing light emitted downward. More specifically, as shown in fig. 1, the lighting device 1 includes a housing 10. The case 10 has a bottomed cylindrical portion 11. The case 10 functions as a mount for mounting the light source 22 (see fig. 4 and 11) in the bottomed tubular portion 11, and is stationary with respect to the light source 22. The case 10 has a plurality of fins 12 projecting upward, and the entire case functions as a heat sink for dissipating heat generated by the light source 22, and in particular, the fins 12 dissipate heat from the light source 22 to outside air. Therefore, the case 10 is preferably made of a material having high thermal conductivity such as a metal material. The case 10 is configured by integrally molding the bottomed cylindrical portion 11 and the fins 12 by aluminum die casting or the like, for example. The case may be formed by joining a bottomed cylindrical portion and a fin. In this case, for example, the bottomed cylindrical portion may be connected to the fin by inserting a protrusion provided in the bottomed cylindrical portion into a hole provided in the fin and then plastically deforming the protrusion. In addition, the housing may not have fins.

The illumination device 1 further includes a spring attachment member 15, an optical axis adjusting member 17, and a housing 20. The spring attachment member 15, the optical axis adjusting member 17, and the housing 20 are each formed of a metal material such as aluminum or a resin material such as polybutylene terephthalate as appropriate. The housing 10, the spring attachment member 15, the optical axis adjusting member 17, and the housing 20 are integrated as described below. Specifically, as shown in fig. 1, the spring attachment member 15 includes an annular flat plate portion 15a and 3 spring attachment portions 15b, and the 3 spring attachment portions 15b protrude downward from the annular flat plate portion 15a at substantially equal intervals in the circumferential direction of the annular flat plate portion 15 a. The frame 20 is a cylindrical member including an annular disc-shaped upper end surface (not shown). As shown in fig. 2, which is a perspective view of the optical axis adjusting member 17, the optical axis adjusting member 17 includes an annular flat plate portion 17a, an upper case fixing portion 17b, and a lower case fixing portion 17c, the upper case fixing portion 17b projecting upward from the annular flat plate portion 17a, and the lower case fixing portion 17c projecting downward from the annular flat plate portion 17 a.

Referring again to fig. 1, the annular flat plate portion 15a of the optical axis adjusting member 17 is fixed to the upper end surface of the frame 20 by screws 23 in a state where the annular flat plate portion 17a of the optical axis adjusting member 17 is sandwiched between the annular flat plate portion 15a of the spring attachment member 15 and the upper end surface of the frame 20. By this fixation, the spring attachment member 15, the optical axis adjusting member 17, and the housing 20 are integrated. As shown in fig. 2, the upper case fixing portion 17b has an elongated hole 17d, and the lower case fixing portion 17c has a cylindrical hole 17 e. Referring to fig. 1, the optical axis adjusting member 17 is screwed to the housing 10 by screws 16 using the elongated hole 17d, and is screwed to the housing 10 by unshown screws using the cylindrical hole 17e (see fig. 2).

The lighting device 1 further includes 3 mounting springs 28. The 3 mounting springs 28 are arranged at substantially equal intervals in the θ direction, and the respective mounting springs 28 are fixed to the spring mounting portion 15 b. The mounting spring 28 is formed of, for example, a metal plate having a bent portion, and has a plate spring structure. The mounting spring 28 is deformed so that the root side portion 28a of the mounting spring 28 extends in the height direction of the embedded hole along the periphery of the embedded hole, and at least a part of the root side portion 28a presses the inner peripheral surface of the embedded hole radially outward. The stationary portion 28b located on the tip end side of the root portion 28a extends radially outward from the embedding hole and is stationary on the back side of the ceiling along the back side of the ceiling. Thus, the mounting spring 28 is fixed around the buried hole. As described above, the spring attachment portion 15b is fixed to the housing 20. Thus, the frame 20 is fixed around the embedding hole. Since the mounting spring 28 is mounted to the housing 20, it is stationary with respect to the housing 20 and also stationary with respect to the ceiling-embedded hole. In addition, the number of the mounting springs may be 2 or 4 or more. The structure for attaching the lighting device to the ceiling may be any structure as long as the lighting device can be fixed to the ceiling, and the structure may not include the attachment spring.

As shown in fig. 1, the case 10 is fixed to the right end of the elongated hole 17d on the paper surface by the screw 16 in a state where the extending direction of the central axis of the housing 20 substantially coincides with the Z direction. In a state where the housing 20 is fixed to the embedding hole by the mounting spring 28, the user applies a force equal to or greater than a static friction force generated by a fastening force of the screw 16 to the upper housing fixing portion 17b to the housing 10. Then, the housing 10 is rotated relative to the optical axis adjusting member 17 with a screw (not shown) screwed into the cylindrical hole 17e and the housing 10 as a fulcrum so that the screw 16 moves leftward in fig. 1 in the elongated hole 17 d. In other words, since the optical axis adjusting member 17 is fixed to the housing 20 so as not to be movable relative thereto, the housing 10 is inclined relative to the housing 20.

Therefore, after the lighting device 1 is fixed to the embedded hole, the user can adjust the housing 10 to be inclined at a desired angle with respect to the housing 20, and can incline the optical axis of the light emitted from the light source 22 (see fig. 4 and 11) fixed to the housing 10 (substantially aligned with the optical axis of the fixed lens 40 described later) at a desired angle with respect to the vertical direction. This can significantly improve the degree of freedom of the irradiation region. Further, although the case where the lighting device 1 is a general-purpose downlight capable of adjusting the optical axis direction with respect to the vertical direction has been described, the lighting device may be configured such that the optical axis direction with respect to the vertical direction cannot be adjusted.

Fig. 3 is an exploded perspective view of a main part of the lighting device 1, and fig. 4 is a cross-sectional view of a cross-sectional surface including the Z direction of the main part. As shown in fig. 3, the lighting device 1 includes a housing 10, a light source module 25, a substrate holder 30, a fixed lens 40, a holder fixing member 42, a lens mounting member 45 (see fig. 7), a movable lens 60, an annular lens holder 70, and an annular rotating member 80. The substrate holder 30 holds the substrate 21 of the light source module 25, and the holder fixing member 42 is used to fix the substrate holder 30 to the upper end surface (main surface) of the housing. The lens mounting member 45 is used to mount the fixed lens 40 disposed below the substrate 21 on the substrate holder 30, and the lens holder 70 holds the movable lens 60. The rotating member 80 has a substantially cylindrical shape and functions to move the lens holder 70 in the optical axis direction with respect to the housing 10.

As shown in fig. 4, the fixed lens 40 is disposed below the light source module 25, and the moving lens 60 is disposed below the fixed lens 40. More specifically, the light emitting surface (end surface on the light emitting side in the Z direction) 88 of the fixed lens 40 is disposed on the light emitting side in the Z direction (lower side in the Z direction) with respect to the light source module 25, and the light projecting surface (end surface on the light emitting side in the Z direction) 87 of the movable lens 60 is disposed on the light emitting side in the Z direction (lower side in the Z direction) with respect to the fixed lens 40. The lens holder 70 is disposed on the outer diameter side of the moving lens 60 so as to surround the moving lens 60, and the rotating member 80 is disposed on the outer diameter side of the lens holder 70 so as to surround the lens holder 70.

As shown in fig. 4, the light incident surface 86 of the fixed lens 40 is formed of a substantially flat surface and is developed in a direction substantially orthogonal to the Z direction. On the other hand, the light emitting surface 88 of the fixed lens 40 is a convex surface that is convex downward in the Z direction. The main body 41 of the fixed lens 40 and the movable lens 60 are each made of a translucent material having translucency. More specifically, in the present embodiment, the body 41 of the fixed lens 40 is formed of a transparent silicone resin, and the moving lens 60 is formed of a transparent resin such as acryl or polycarbonate, or a glass material. The main body of the fixed lens and the movable lens may be made of any of transparent resin materials such as acrylic, polycarbonate, and silicone, or glass materials.

As shown in fig. 4, the rotating member 80 has an inner peripheral surface 85 disposed so as to surround the moving lens 60. The entirety of the inner peripheral surface 85 constitutes a low reflectance inner surface portion. Specifically, the rotating member 80 is made of a colored, particularly preferably black resin, or the inner peripheral surface 85 of the rotating member 80 is coated with a colored, particularly preferably black coating. Therefore, the light reflectance of the inner peripheral surface 85 is 15% or less. The light reflectance of the inner peripheral surface 85 is preferably 10% or less, more preferably 5% or less, and most preferably 0%.

With this configuration, light is hardly reflected by the inner peripheral surface 85, and light can be absorbed by the inner peripheral surface 85. This can reduce the glare when the person looks at the lighting device 1. In addition, although the case where the entire inner peripheral surface 85 constitutes the low reflectance inner surface portion and the entire light reflectance of the inner peripheral surface 85 is 15% or less has been described, the light reflectance may not be 15% or less in the entire inner peripheral surface. More specifically, the inner peripheral surface surrounded by the moving lens may include a low-reflectance inner surface portion having a light reflectance of 15% or less in a portion located on the light emitting side with respect to the Z direction from the position where the moving lens is moved to the most light source side. Alternatively, the light reflectance may be larger than 15% in the entire inner peripheral surface.

Fig. 5 is a perspective view of the fixed lens assembly 90 mounted on the housing 10 as viewed from the lower side. The light source module (see fig. 3)25, the substrate holder 30, the fixed lens 40, the holder fixing member 42, and the lens mounting member 45 are integrated and integrated. The fixed lens assembly 90 comprises this unitary construction. Hereinafter, first, the structure of the fixed lens unit 90 will be described, and the structure of fixing the fixed lens unit 90 to the housing 10 will also be described.

Fig. 6 is a perspective view of the fixed lens 40, and fig. 7 is a perspective view of the lens mount 45. Fig. 8 is a perspective view of the lens attachment member 45 in a state where the fixed lens 40 is placed on the upper side, and fig. 9 is a perspective view of the fixed lens unit 90. As shown in fig. 6, the fixed lens 40 has a main body 41 and a pair of holding

portions

53 and 54. The fixed lens 40 is formed by, for example, two-color molding, and the main body 41 and the pair of holding

portions

53 and 54 are formed of different materials from each other. The main body 41 has a higher transmittance than the pair of holding

portions

53 and 54. As described above, in the present embodiment, the main body 41 for fixing the lens 40 is formed of a transparent silicone resin, but it is preferable that the holding

portions

53 and 54 for fixing the lens 40 are formed of a transparent or non-transparent silicone resin. The holding

portions

53 and 54 for fixing the lens 40 may be made of any of a transparent resin material such as acrylic, polycarbonate, or silicone, a non-transparent resin material, or a glass material. The main body 41 and the pair of holding

portions

53 and 54 may be formed of the same transparent material or may have the same transmittance.

The main body 41 has a substantially circular shape in a plan view when viewed from the optical axis direction. The body 41 has the above-described substantially planar light incident surface 86, the above-described light emitting surface 88 (see fig. 4) which is a convex surface protruding downward in the Z direction, and a conical outer peripheral surface 63. The light incident surface 86 is formed of a substantially circular plane, and the extending direction of the central axis of the conical outer peripheral surface 63 substantially coincides with the Z direction. On the other hand, the pair of holding

portions

53 and 54 are disposed to face each other in the R direction with the central axis of the main body 41 interposed therebetween, and the holding

portions

53 and 54 extend outward in the R direction from the conical outer peripheral surface 63. The holding

portions

53 and 54 radially protrude from the 1 st edge portion 41a of the main body 41, more specifically, from the 1 st edge portion 41a of the conical outer peripheral surface 63. The one holding portion 53 has a 1 st radially extending portion 55 radially protruding from the 1 st edge portion 41a of the main body 41, and a 1 st L-shaped portion 56. Further, the 1L-th letter portion 56 includes a 1 st orthogonal extension portion 56a extending from the tip of the 1 st radially extending portion 55 in the orthogonal direction orthogonal to the 1 st radially extending portion 55, and a 2 nd radially extending portion 56b extending from the tip of the 1 st orthogonal extension portion 56a on the opposite side to the 1 st radially extending portion 55 side substantially in parallel with the 1 st radially extending portion 55. The 2 nd radially extending portion 56b is provided with a 1 st through hole 56 c.

Similarly, the other holding portion 54 protrudes in the radial direction from the 2 nd edge portion 41b of the main body 41 facing the 1 st edge portion 41a in the R direction, more specifically, from the 2 nd edge portion 41b of the conical outer peripheral surface 63. The other holding portion 54 has a 3 rd radially extending portion 57 projecting in the radial direction from the 2 nd edge portion 41b, and a 2 nd L-shaped portion 58. Further, the 2L-th letter portion 58 includes a 2 nd orthogonal extension portion 58a extending from the leading end portion of the 3 rd radially extending portion 57 in the direction orthogonal to the 3 rd radially extending portion 57, and a 4 th radially extending portion 58b extending from the leading end portion of the 2 nd orthogonal extension portion 58a on the side opposite to the 3 rd radially extending portion 57 side substantially in parallel with the 3 rd radially extending portion 57. The 4 th radially extending portion 58b is provided with a 2 nd through hole 58 c. In a plan view when viewed from the Z direction, the 1 st radially extending portion 55 and the 3 rd radially extending portion 57 are located on the same 1 st straight line passing through the center of the main body 41. Further, in a plan view when viewed from the Z direction, a 2 nd straight line connecting the center of the 1 st through hole 56c and the center of the 2 nd through hole 58c passes through the center of the main body 41 and is inclined with respect to the 1 st straight line.

As shown in fig. 7, the lens mounting member 45 has a plane-symmetrical structure, and includes a ring portion 50, 2 lens support portions 51, and 2 holder locking portions 52. The lens support portion 51 has a recess 59, and the recess 59 protrudes outward in the radial direction from the ring portion 50, and is open on both sides in the R direction and on the upper side in the Z direction. Further, the lens support portion 51 has a flat surface portion 51a located on the same plane as the bottom surface 59a of the recess 59. Further, the holder locking portion 52 protrudes outward in the R direction from the end surface of the lens support portion 51 on the outer side in the R direction. The length a in the orthogonal direction orthogonal to both the R direction and the Z direction in the recess 59 is larger than the width b of the 1 st radially extending portion 55 (the 3 rd radially extending portion 57 of the holding portion 54) of the holding portion 53 (see fig. 6).

Each of the holder locking portions 52 has a 1 st flat plate portion 46 extending in a direction orthogonal to the Z direction, and a 2 nd flat plate portion 47 extending upward in the Z direction from an outer end of the 1 st flat plate portion 46 in the R direction. The 1 st flat plate portion 46 is provided with a through hole 66 penetrating therethrough in the Z direction. The pair of

columnar portions

64a and 64b project upward in the Z direction from both sides of the through hole 66 of the 1 st flat plate portion 46 in the orthogonal direction. On the other hand, the 2 nd flat plate portion 47 has a recess 48 communicating with the through hole 66 and opening to the lower side in the Z direction. The bottom surface of the recess 48 is a locking end surface 65 facing the Z-direction lower side.

As shown in fig. 8, the 1 st and 3 rd radially extending

portions

55, 57 pass through the recess 59. The main body 41 side portions of the holding

portions

53 and 54 are placed on the flat surface portion 51 a. As described above, the holding

portions

53 and 54 are L-shaped at portions connected to the R-direction outer ends of the 1 st and 3 rd radially extending

portions

55 and 57. As a result, in the state shown in fig. 8, the holding

portions

53 and 54 are present at positions not overlapping the through-holes 66 when viewed from the Z direction.

Fig. 10 is a perspective view of the fixed lens unit 90 with the lens attachment member 45 removed, as viewed from the lower side. As shown in fig. 9 and 10, the substrate holder 30 has a pair of

columnar protrusions

31a and 31b protruding downward and inserted into the 1 st and 2 nd through

holes

56c and 58 c. As shown in fig. 9, the substrate holder 30 has an engaging portion 34 extending downward. After the fixed lens 40 is placed on the lens mounting member 45 and brought into the state shown in fig. 8, if the

protrusions

31a and 31b are inserted into the 1 st and 2 nd through

holes

56c and 58c, the locking portion 34 of the substrate holder 30 is accommodated in the through hole 66 in a state positioned by the pair of

columnar portions

64a and 64b (see fig. 7) as shown in fig. 9, and the locking claw 34a of the locking portion 34 is locked to the locking end surface 65. Thereby, the substrate holder 30, the fixed lens 40, and the lens mounting member 45 are integrated. As shown in fig. 5, in the state where the integrated structure is configured, the ring portion 50 of the lens mount member 45 is positioned outward in the R direction of the main body 41 to which the lens 40 is fixed.

Next, the holding of the light source module 25 in the fixed lens unit 90 and the fixing of the fixed lens unit 90 to the housing 10 will be described. Fig. 11 is a perspective view of the fixed lens unit 90 after the fixed lens 40 is removed from the state shown in fig. 10 when viewed from the lower side. Fig. 12 is a perspective view of the fixed lens unit 90 with the light source module 25 (see fig. 11) removed as viewed from above, and fig. 13 is a perspective view of the substrate holder 30 holding the light source module 25 as viewed from above.

As shown in fig. 10, if the lens mounting part 45 is detached from the fixed lens assembly 90, the fixed lens 40 is exposed to the outside. The main body 41 of the fixed lens 40 has a light emitting surface 88 formed of the convex surface described above. As shown in fig. 4 and 10, the light emitting surface 88 has an annular tapered surface portion 88a whose tip is tapered as it goes downward in the Z direction in the peripheral portion in the radial direction, and a substantially circular flat surface portion 88b in the central portion in the radial direction. Further, as shown in fig. 11, if the lens mounting member 45 and the fixed lens 40 are detached from the fixed lens assembly 90, the light source 22 is exposed to the outside. Referring to fig. 11, the light source module 25 has a substrate 21 and a light source 22. The substrate 21 has a flat plate shape that is substantially rectangular in plan view. The light source 22 has a disc-like shape and is disposed substantially at the center of the lower surface (mounting surface) of the substrate 21. The light source module 25 has, for example, a COB (Chip On Board) structure, and the light source 22 includes a plurality of LEDs (light emitting diodes) mounted On the substrate 21 and a sealing member sealing the plurality of LEDs.

The substrate 21 is made of, for example, a ceramic substrate, a resin substrate, a metal base substrate, or the like. Although not described in detail, a pair of electrode terminals and a metal wiring having a predetermined pattern are formed on the substrate 21. The pair of electrode terminals is provided to receive dc power from the outside to cause the LED to emit light. Further, metal wirings of a prescribed pattern are provided to electrically connect the LEDs to each other.

The LED is composed of, for example, a bare chip that emits monochromatic visible light, and a blue LED chip that emits blue light when energized. The plurality of LEDs are arranged in a matrix on the substrate 21, for example. In addition, only 1 LED may be mounted on the substrate. The sealing member is made of, for example, a translucent resin and contains a phosphor. The phosphor functions to convert the wavelength of light from the LED. The sealing member is made of, for example, a fluorescent material-containing resin in which fluorescent material particles are dispersed in a silicone resin. When the light source module 25 emits white light and the LED is a blue LED chip emitting blue light, the phosphor particles are made of, for example, a yellow phosphor such as YAG.

The sealing member may seal all the LEDs together, may seal a plurality of LEDs in a line shape for each row, or may seal the LEDs individually. The light source may include a light emitting element other than an LED, and may be a solid-state light emitting element such as a semiconductor laser element, an organic EL (Electro Luminescence) element, or an inorganic EL element. Alternatively, the light source may be constituted by an incandescent lamp, a fluorescent lamp, or the like.

As shown in fig. 11, 2 holder fixing members 42 are disposed below the substrate holder 30 at intervals in the longitudinal direction of the substrate holder 30. The holder fixing member 42 has a mounting hole 43, and the mounting hole 43 overlaps with the mounting hole 39 (see fig. 12) of the substrate holder 30 and also overlaps with a screw hole (not shown) provided in the main surface 18 (see fig. 5) of the housing 10 when viewed from the Z direction. As shown in fig. 12, the substrate holder 30 has a through hole 37 having a substantially rectangular shape in a plan view. When the holder fixing member 42 is disposed at a predetermined position with respect to the substrate holder 30, the substrate receiving portion 42a, which is a part of the holder fixing member 42, overlaps the through hole 37 when viewed in the Z direction. The substrate holder 30 and the holder fixing member 42 define the substrate accommodating chamber 27.

As shown in fig. 13, the light source module 25 is housed in the substrate housing chamber 27 (see fig. 11) with the light source 22 facing downward. In a state where the light source module 25 is accommodated in the substrate accommodating chamber 27, a part of the lower surface of the substrate 21 is in contact with the substrate receiving portion 42a (see fig. 12). Further, the substrate holder 30, which accommodates the substrate 21 in the substrate accommodating chamber 27, is integrated with the fixed lens 40 and the lens mounting member 45 as described above. Then, bolts (not shown) are screwed from below into the mounting holes 43 (fig. 11) of the holder fixing member 42, the mounting holes 39 (see fig. 12) of the substrate holder 30, and screw holes (not shown) provided in the main surface 18 (see fig. 5) of the housing 10. By this screwing, the fixed lens assembly 90 (refer to fig. 9) is fixed to the main surface 18 of the housing 10.

Referring again to fig. 4, in a state where the fixed lens unit 90 is fixed to the main surface 18, the front end surface 29 of the disc-shaped resin injection part of the light source 22 faces the planar light incident surface 86 of the fixed lens 40 with a slight gap therebetween in the Z direction. In this way, the light emitted from the light source 22 without being incident on the fixed lens 40 is reduced, and the fixture efficiency, that is, the ratio of the light emitted from the light source 22 to the light emitted outside the lighting device 1 is increased. Further, the Z-direction position of the front end surface 29 of the disc-shaped resin injection part of the light source 22 may be matched with the Z-direction position of the planar light incident surface 86 of the fixed lens 40, so that the front end surface 29 of the light source 22 is brought into contact with the light incident surface 86 of the fixed lens 40, and as a result, the device efficiency can be further improved.

As described above, the fixed lens 40 is made of a silicone resin and is made of a silicone-containing material having excellent heat resistance. In this way, the distal end surface 29 of the light source 22 is positioned in the vicinity of the light incident surface 86 of the fixed lens 40, and even if the fixed lens 40 becomes high in temperature due to heat from the light source 22, thermal degradation of the fixed lens 40 is suppressed or prevented.

Furthermore, the fixed lens 40 has a Shore A hardness (JISK 6253: 2012) of 50 to 90 and a large elasticity. More specifically, the fixed lens 40 is made of, for example, a rubber elastic body, and is made of a silicone material. In this way, since the distal end surface 29 of the light source 22 is disposed in the vicinity of the light incident surface 86 of the fixed lens 40, even if the fixed lens 40 is thermally expanded due to heat from the LED to a high temperature and comes into contact with the resin molded part of the light source 22, the volume increase of the fixed lens 40 due to the thermal expansion is absorbed by the elasticity of the fixed lens 40. Further, excessive stress is not applied to the resin injection part and the fixed lens 40 which are in contact with each other, and damage to the resin injection part and the fixed lens 40 is suppressed or prevented. Therefore, the lighting device 1 can simultaneously achieve 2 operational effects in a trade-off relationship (a relationship opposite to each other), that is, an operational effect of reducing stray light and improving the device efficiency, and an operational effect of suppressing damage to the resin injection part and the fixed lens 40, and can achieve a significant operational effect.

When the front end surface 29 of the light source 22 is in contact with the light incident surface 86 of the fixed lens 40 and the distance between the light source 22 and the light incident surface 86 in the Z direction is 0mm, the instrument efficiency can be maximized, which is preferable. However, if the distance between the light source 22 and the light incident surface 86 in the Z direction is 1.5mm or less, the device efficiency can be improved as in the present embodiment, and for example, the distance between the light source 22 and the light incident surface 86 in the Z direction may be set to 1.3mm or less, 1.0mm or less, 0.7mm or less, or 0.5mm or less. Note that, the case where the distance between the light source 22 and the light incident surface 86 in the Z direction is 0mm includes the case where the distance between the light source 22 and the light incident surface 86 in the Z direction is set to 1mm and the distance in the Z direction is 0mm due to a tolerance.

Further, in the present embodiment, the transmission coefficient of the body 41 of the fixed lens 40 is higher than that of the moving lens 60. Further, the refractive index of the fixed lens 40 is smaller than that of the moving lens 60. Here, as in the present embodiment, in the case where the fixed lens 40 includes the main body 41 and the pair of holding

portions

53 and 54, the condition that the refractive index of the fixed lens 40 is smaller than the refractive index of the moving lens 60 is satisfied if the refractive index of the main body 41 of the fixed lens 40 is smaller than the refractive index of the moving lens 60. More specifically, in the present disclosure, the condition that the refractive index of the fixed lens is smaller than the refractive index of the moving lens is satisfied if the refractive index of a portion of the fixed lens that is substantially circular in plan view when viewed from the Z direction is smaller than the refractive index of a portion of the moving lens that is substantially circular in plan view when viewed from the Z direction. In the case where the fixed lens 40 has the shape described in the present embodiment, the refractive index of the body 41 of the fixed lens 40 may be smaller than the refractive index of the moving lens 60, and the refractive index of the holding

portions

53 and 54 of the fixed lens 40 may also be smaller than the refractive index of the moving lens 60, or the refractive index of the body 41 of the fixed lens 40 may be smaller than the refractive index of the moving lens 60, while the refractive index of the holding

portions

53 and 54 of the fixed lens 40 may be equal to or greater than the refractive index of the moving lens 60. The fixed lens may have a shape different from that of the present embodiment, or may not have a holding portion, and may be configured only by a portion having a substantially circular shape in a plan view when viewed from the Z direction, for example. If the entire fixed lens 40 is formed of a transparent silicone resin and the moving lens 60 is formed of a transparent resin such as acrylic or polycarbonate or a glass material, the refractive index of the fixed lens 40 can be easily made smaller than that of the moving lens 60. According to this configuration, the traveling direction of light incident on the fixed lens 40 is not easily changed. This can prevent the light incident on the fixed lens 40 from bypassing the holding portions 53 and 54 (see fig. 6) and becoming stray light in the illumination device 1, thereby improving the fixture efficiency and realizing bright illumination light.

In the present embodiment, the arithmetic average roughness of the light incident surface 86 is smaller than the arithmetic average roughness of the light exit surface 88. The LED has a property that the color of light around the optical axis is easily different from the color of light on the peripheral side, and for example, in the case of a white LED, the color of light around the optical axis is close to a desired white color, and the light on the peripheral side is easily yellowish. Therefore, when the light source is an LED, if any measures are not taken, color unevenness is likely to occur in the illumination light.

In contrast, in the present embodiment, since the arithmetic average roughness of the light incident surface 86 is smaller than the arithmetic average roughness of the light emitting surface 88, it is easy not only to control the light incident on the light incident surface 86 so as to easily and efficiently guide the light to the light emitting surface 88 side, but also to mix and blend the light emitted from the light emitting surface 88. This can suppress color unevenness of the illumination light for each illumination region, and realize clean illumination light.

Next, a structure in which the movable lens 60 (see fig. 3) can move in the Z direction will be described. Fig. 14 is a perspective view of an optical member 95 including a lens holder 70 and a movable lens 60 held by the lens holder, fig. 15 is a perspective view of the lens holder 70, and fig. 16 is a perspective view of the movable lens 60. As shown in fig. 14, the lens holder 70 is an annular member and is disposed so as to surround the moving lens 60. The lens holder 70 is suitably formed of a metal material such as aluminum or a resin material such as polybutylene terephthalate.

As shown in fig. 15, the lens holder 70 has 3 locking portions 71 arranged at intervals in the circumferential direction, and each locking portion 71 extends in the Z direction. The locking portion 71 includes a concave surface 71a projecting inward in the R direction, and the concave surface 71a extends outward in the R direction and in the Z direction. The function of the locking portion 71 will be described later. The lens holder 70 has 3 lens fitting portions 73, and the 3 lens fitting portions 73 are arranged on the inner peripheral side at substantially equal intervals in the θ direction. The lens fitting portion 73 is constituted by a protruding portion protruding inward in the R direction. As shown in fig. 16, the moving lens 60 has a shape whose tip widens as it goes to the lower side in the Z direction. The moving lens 60 has 3 holder fitting portions 61 arranged at substantially equal intervals in the θ direction at the lower end of the outer peripheral side. The holder fitting portion 61 has a shape corresponding to the shape of the lens fitting portion 73 (see fig. 15), and is formed of a concave portion recessed inward in the R direction. The lens fitting portion 73 is press-fitted into the holder fitting portion 61, and the moving lens 60 is fixed to the lens holder 70, whereby an optical member 95 shown in fig. 14 is configured.

Next, an integrated structure in which the optical member 95 can move relative to the rotating member 80 will be described. As shown in fig. 15, the lens holder 70 has 2 fitting claws 78 on the outer peripheral side. The fitting claw 78 is an example of a fitting portion. The 2 fitting claws 78 are arranged to face each other in the R direction, and each fitting claw 78 has a plate shape having a pair of

inclined surfaces

78a and 78 b. The

inclined surfaces

78a and 78b extend in a direction inclined with respect to the Z direction.

Fig. 17 is a perspective view of the rotating member 80. As shown in fig. 17, the rotating member 80 is a substantially cylindrical member and has 2 inclined grooves 81 arranged at intervals in the θ direction. The inclined groove 81 has a shape constituted by a part of a spiral groove. The inclined groove 81 is inclined with respect to the Z direction and extends from the Z direction lower side to the Z direction upper side of the rotary member 80 as it goes to the θ direction side. The inclined groove 81 has a structure of an elongated through hole having a long hole shape penetrating the rotary member 80 in the thickness direction, and includes a pair of inner wall surfaces (inclined surfaces) 81a and 81b facing each other in the Z direction.

As shown in fig. 18, the fitting claw 78 projecting outward in the R direction in the optical member 95 is fitted into the inclined groove 81 of the rotating member 80, and the optical member 95 and the rotating member 80 are integrated to constitute the movable lens unit 75. The fitting claw 78 is movable in the extending direction of the inclined groove 81 in the inclined groove 81. When the optical member 95 is rotated relative to the rotating member 80 in the direction indicated by θ 1 in fig. 18 from the state shown in fig. 18, the moving lens 60 moves upward in the Z direction relative to the rotating member 80. In this way, the position of the fitting claw 78 in the inclined groove 81 is adjusted, and the Z-direction position of the moving lens 60 with respect to the rotating member 80 can be adjusted.

Next, a mounting structure of the movable lens unit 75 to the housing 10 will be described. As shown in fig. 3, the housing 10 has a two-part configuration including a 1 st part 10a and a 2 nd part 10 b. Fig. 19 is a perspective view of the 1 st part 10a of the housing 10. As shown in fig. 19, the case 10 has a plurality of columnar portions (ribs) 97 extending from the main surface 18 side to the Z-direction lower side. The columnar portion 97 is provided in a stationary portion that is stationary with respect to the light source 22. The front end surface of the columnar portion 97 is a convex surface 97a that is convex inward in the R direction. In this embodiment, the 1 st member 10a shown in fig. 19 has 2 columnar portions 97, and the 2 nd member 10b (see fig. 3) has 1 columnar portion (not shown).

The convex surface 97a of the 3 columnar portions 97 is locked to the concave surface 71a of the 3 locking portions 71 of the lens holder 70 included in the movable lens unit 75 (see fig. 18). Further, as shown in fig. 20, which is a perspective view of the lighting device 1 viewed from a different angle from fig. 1, if the 1 st member 10a and the 2 nd member 10b are integrated by the screws 98, the rotary member 80 included in the movable lens unit 75 is attached to the housing 10 so as to be relatively rotatable with respect to the housing 10 with the Z-direction position thereof being almost unchanged with respect to the housing 10. By this attachment, the movable lens unit 75 is integrated with the housing 10.

In more detail, the mounting of the rotating member 80 with respect to the housing 10 is performed as follows. As shown in fig. 4, the rotating member 80 includes a 1 st annular flange 35 and a 2 nd annular flange 36 located on the lower side in the Z direction, and an annular groove 38 is provided between these

flanges

35, 36 in the Z direction. The housing 10 has an annular protrusion 13 protruding inward in the R direction on the Z direction lower side. When the 1 st member 10a and the 2 nd member 10b are integrated and the case 10 and the movable lens unit 75 are integrated, the annular projection 13 is accommodated in the annular groove 38. The 1 st annular flange portion 35 has a portion overlapping the annular protrusion 13 when viewed in the Z direction, and the 2 nd annular flange portion 36 has a portion overlapping the annular end surface 14 located on the lower side in the Z direction in the housing 10. As shown in fig. 4, in a state where the lower surface of the 1 st annular flange 35 is in contact with the upper surface of the annular projecting portion 13, the annular end surface 14 and the upper surface of the 2 nd annular flange 36 are opposed to each other with a slight gap therebetween in the Z direction. The lower movement of the rotary member 80 relative to the housing 10 is restricted by the annular protrusion 13, and the upper movement of the rotary member 80 relative to the housing 10 is restricted by the annular end surface 14 of the housing 10. As a result, the rotary member 80 can be relatively rotated with respect to the casing 10 in a state where the Z-direction position is substantially unchanged with respect to the casing 10. Since the slight gap is present, the rotary member 80 can be smoothly rotated with respect to the housing 10. The Z-direction position of the rotary member 80 relative to the casing 10 varies by the Z-direction length of the slight gap. This is repeated, but the Z-direction position of the rotary member 80 with respect to the casing 10 is not substantially changed.

Referring again to fig. 17, the rotary member 80 has an annular grip portion 80a on the lower side in the Z direction for a person to grip and rotate. As shown in fig. 4, the grip portion 80a is located below the housing 10 in the Z direction and is exposed to the outside. Therefore, a person can insert a finger into the gap to rotate the grip portion 80a of the rotating member 80, and can rotate the rotating member 80 in the θ direction in both directions with respect to the housing 10.

In the above configuration, it is assumed that a person rotates the rotary member 80 with respect to the housing 10 using the grip portion 80 a. Then, since the optical member 95 is locked to the columnar portion 97 by the locking portion 71 and is in a state of being unable to rotate relative to the housing 10, the rotating member 80 does not rotate in conjunction with the rotation of the rotating member 80, but the rotating member 80 rotates relative to the optical member 95. Therefore, the fitting claw 78 moves in the inclined groove 81 by the relative rotation, and as a result, the optical member 95 moves relative to the rotating member 80 in the Z direction. Thus, as described above, even if the rotating member 80 rotates, the Z-direction position of the rotating member 80 hardly changes, and therefore the Z-direction position of the optical member 95 can be freely changed, and the Z-direction position of the moving lens 60 included therein can also be freely changed.

Fig. 21 is a schematic cross-sectional view for explaining the dimensions of the light source 22, the fixed lens 40, and the moving lens 60. As shown in fig. 16 and 21, the moving lens 60 includes an annular fresnel element 69 on the upper side in the Z direction and on the outer peripheral side in the θ direction. As shown in fig. 21 (a), the 1 st projection area S2 of the normal projection of the fixed lens 40 on the vertical plane P perpendicular to the Z direction is equal to or larger than the 2 nd projection area S1 of the normal projection of the light source 22 on the vertical plane P. Further, the 3 rd projected area S21 of the orthogonal projection of the light incident surface 86 of the fixed lens 40 to the vertical plane P is smaller than the 4 th projected area S22 of the orthogonal projection of the light exit surface 88 to the vertical plane P, and the 2 nd projected area S1 is smaller than the 3 rd projected area S21. In addition, in the present embodiment, the 1 st projected area S2 coincides with the 4 th projected area S22, but the 1 st projected area S2 may be larger than the 4 th projected area S22. Further, a 5 th projected area S31 of an orthogonal projection of the light incident surface 83 on the light source 22 side with respect to the vertical plane P in the Z direction of the moving lens 60 is smaller than a 6 th projected area S32 of an orthogonal projection of the light projecting surface 87 with respect to the vertical plane P, and a 4 th projected area S22 is smaller than a 5 th projected area S31.

Further, in the present embodiment, the height h1 of the fresnel element 69 is larger than the thickness (height) h2 of the fixed lens 40. Further, as shown in fig. 21 (b), when the movable lens 60 is moved to the wide angle position of the movable lens 60 closest to the light source 22 in the Z direction, the entire fixed lens 40 is accommodated in the concave portion 77 defined by the inner peripheral surface 69a of the annular fresnel element 69 and the end surface 76 of the movable lens 60 on the light source 22 side in the Z direction.

In addition, in the present embodiment, even if the Z-direction position of the movable lens 60 varies, the Z-direction dimension of the illumination device 1 does not change, and therefore the illumination device 1 can be made compact and fashionable. Here, the case where the inclined groove 81 has a structure having a through hole with an elongated long hole shape has been described, but the inclined groove may have a structure having a bottom. In the lighting device 1, the fitting claw 78 is provided on the optical member, and the inclined groove 81 into which the fitting claw 78 is fitted is provided on the rotating member 80, whereby the movable lens 60 can be moved relative to the fixed lens 40 in the Z direction. However, the fitting claw may be provided on the rotating member, and the inclined groove into which the fitting claw is fitted may be provided on the optical member, so that the movable lens can be relatively moved in the Z direction with respect to the fixed lens. Instead of the fitting claw, a cylindrical pin may be fitted into the inclined groove.

Alternatively, the illumination device of the present disclosure may not have the inclined groove 81 unlike the illumination device 1 of embodiment 1, or may move the moving lens in the Z direction without using the inclined groove 81. For example, the illumination device of the present disclosure may be configured as disclosed in a plurality of publications such as patent document 1, that is, configured such that the dimension in the Z direction of the illumination device varies if the position in the Z direction of the movable lens varies. In this case, the housing may include the 1 st housing and the 2 nd housing, and the 2 nd housing may be relatively moved in the Z direction with respect to the 1 st housing by using a screw structure, or the moving lens fixed to the 2 nd housing may be relatively moved in the Z direction with respect to the fixed lens fixed to the 1 st housing.

As described above, the lighting device 1 includes: a housing 10; a light source 22 fixed in the housing 10 and emitting light; a fixed lens 40 fixed in the housing 10 and having a light emitting surface 88 positioned on a light emitting side in the Z direction (optical axis direction) with respect to the light source 22; and a movable lens 60 having a light projecting surface 87 disposed on the light emitting side in the Z direction with respect to the fixed lens 40, wherein the distance between the movable lens 60 and the light source 22 in the Z direction can be varied. The light incident surface 86 of the fixed lens 40 is substantially planar, while the light exit surface 88 is convex. The 1 st projected area S2 of the normal projection of the fixed lens 40 on the vertical plane P perpendicular to the Z direction is equal to or larger than the 2 nd projected area S1 of the normal projection of the light source 22 on the vertical plane P.

Fig. 22 (a) is a schematic view showing the light distribution at the narrow angle of the illumination device 1, and fig. 22 (b) is a schematic view showing the light distribution at the narrow angle, the middle angle, and the wide angle of the illumination device of the reference example, which is different from the illumination device 1 only in that there is no fixed lens. Fig. 22 (c) is a schematic diagram showing the light distribution at the narrow angle, the middle angle, and the wide angle of the illumination device 1.

As shown in fig. 22 (b), in the case of an illumination device without a fixed lens, the central portion of the illumination region tends to be darker than the peripheral portion at the middle angle. In contrast, in the illumination device 1 of the present disclosure, since the fixed lens 40 is fixed in the housing 10, more of the light emitted from the light source 22 can be received by the fixed lens 40, and the light received by the fixed lens 40 can be controlled to be directed downward with a small inclination angle with respect to the Z direction. Thus, excellent narrow angle control can be performed. Further, since the light received by the fixed lens 40 can be controlled in the light distribution in the direction having a small inclination angle with respect to the Z direction, the efficiency of the device can be easily improved, and not only can the light be effectively used, but also the light emitted from the light source 22 can be easily controlled in the light distribution more precisely by the movable lens 60, and as shown in fig. 22 (c), the generation of the center dimming at the middle angle can be suppressed. This makes it easy to achieve both good narrow-angle characteristics and suppression of center darkening, and to emit light from the light source 22 to the irradiation region without loss. Therefore, the lighting device 1 includes: a housing 10; a light source 22 fixed in the housing 10 and emitting light; a movable lens 60 whose distance from the light source 22 in the Z direction (optical axis direction) can be varied; and a narrow-angle central darkening improvement mechanism for suppressing the central darkening of the irradiation light emitted from the moving lens 60, in which the illuminance of the irradiation light at the central portion of the irradiation surface is lower than that at the peripheral portion, and also suppressing the reduction of narrow-angle characteristics in which the area of the irradiation surface is reduced. Also, the fixed lens 40 includes a darkening improvement mechanism in the narrow-angle center.

Further, according to the lighting device 1, the 1 st projected area S2 is equal to or larger than the 2 nd projected area S1, and the light incident surface 86 of the fixed lens 40 is substantially planar. Therefore, not only the light from the light source 22 is easily made to efficiently enter the fixed lens 40, but also the light passing through the fixed lens 40 is easily made into parallel light parallel to the Z direction, and the spread of the emitted light is easily suppressed. Further, since the light exit surface 88 of the fixed lens 40 is convex, light reaching the light exit surface 88 can be easily condensed, and light projected from the light exit surface 88 can be easily and efficiently incident on the movable lens 60. This can further improve the efficiency of the device.

The 3 rd projected area S21 of the light incident surface 86 on the orthogonal projection with respect to the vertical plane P may be smaller than the 4 th projected area S22 of the light exit surface 88 on the orthogonal projection with respect to the vertical plane P. The 2 nd projected area S1 may be smaller than the 3 rd projected area S21.

According to the present configuration, since the 2 nd projected area S1 is smaller than the 3 rd projected area S21, the light from the light source 22 can be made to enter the fixed lens 40 more efficiently. Further, since the 3 rd projected area S21 is smaller than the 4 th projected area S22, it is easy to control the light from the light source 22 to the lower side in the Z direction, and it is easy to make the light from the fixed lens 40 enter the moving lens 60 more efficiently. Thus, the efficiency of the appliance can be further improved. In addition, this configuration may not be adopted, and the 3 rd projected area may be equal to or larger than the 4 th projected area. The 2 nd projection area may be equal to or larger than the 3 rd projection area.

Further, the 5 th projection area S31 of the orthogonal projection of the light incident surface 83 on the light source 22 side in the Z direction of the moving lens 60 on the vertical plane P may be smaller than the 6 th projection area S32 of the orthogonal projection of the light projecting surface 87 on the vertical plane P. The 4 th projected area S22 may be smaller than the 5 th projected area S31.

According to this configuration, since the 4 th projected area S22 is smaller than the 5 th projected area S31, the light emitted from the fixed lens 40 can be efficiently incident on the moving lens 60. Further, since the 5 th projected area S31 is smaller than the 6 th projected area S32, it is easy to control the irradiation light from the illumination device 1 to the lower side in the Z direction. This enables excellent narrow-angle light distribution at a narrow-angle position. In addition, this configuration may not be adopted, and the 4 th projected area may be equal to or larger than the 5 th projected area. The 5 th projected area may be equal to or larger than the 6 th projected area.

The distance between the light source 22 and the light incident surface 86 in the Z direction may be 1.5mm or less.

According to this configuration, as described above, the light emitted from the light source 22 and not incident on the fixed lens 40 can be reduced, and the device efficiency can be further improved. Further, without adopting this configuration, the distance between the light source and the light incident surface of the fixed lens in the Z direction may be larger than 1.5 mm.

The arithmetic average roughness of the light incident surface 86 may be smaller than the arithmetic average roughness of the light exit surface 88.

According to this configuration, since the arithmetic average roughness of the light incident surface 86 is smaller than the arithmetic average roughness of the light exit surface 88, the light incident on the light incident surface 86 is easily controlled, and the light is easily and efficiently guided toward the light exit surface 88. Further, since the light emitted from the light emitting surface 88 can be easily mixed and homogenized, the light on the optical axis side and the light on the peripheral side emitted from the LED can be easily mixed and homogenized as a result. This can suppress color unevenness of the illumination light for each illumination region, and can emit clean and pleasant illumination light. Further, without adopting this configuration, the arithmetic average roughness of the light incident surface of the fixed lens may be equal to or more than the arithmetic average roughness of the light emitting surface of the fixed lens.

Further, the Shore (A) hardness of the fixed lens 40 may be 50 to 90.

As described above, if the light source is in contact with the light incident surface of the fixed lens, the light from the light source can be most efficiently incident on the fixed lens, and the device efficiency can be improved. However, in such a case, the fixing lens is likely to expand due to heat from the light source, and the fixing lens and the light source may be damaged due to the expansion of the fixing lens.

In contrast, according to the present configuration, the shore (a) hardness of the fixed lens 40 is 50 to 90, and the fixed lens 40 has excellent elasticity. Therefore, in the case where the light source 22 is brought into contact with the light incident surface 86 of the fixed lens 40 to achieve excellent device efficiency, even if the fixed lens 40 is thermally expanded, the fixed lens 40 is elastically deformed, and damage to the fixed lens 40 or the light source 22 can be suppressed or prevented. This makes it possible to achieve 2 effects in a trade-off relationship (a relationship opposite to each other), that is, an effect of excellent device efficiency and an effect of suppressing damage to the light source 22 and the fixed lens 40, and thus a significant effect can be achieved.

In embodiment 1, the case where the fixed lens 40 is formed of a rubber elastic body made of a transparent silicone material and the shore (a) hardness of the fixed lens 40 satisfies the condition of 50 to 90 is described. However, the condition that the shore (a) hardness is 50 to 90 may be satisfied by forming the fixed lens from a rubber elastic body made of a material other than silicone material, or may be satisfied by forming the fixed lens from a transparent elastic body other than silicone material. Alternatively, instead of this configuration, the shore (a) hardness of the fixed lens may be smaller than 50 or larger than 90.

The fixed lens 40 may be made of a silicone material containing silicone.

The closer the light source is to the light incident surface of the fixed lens, the higher the efficiency of the device can be improved, and the brighter the irradiation light can be realized.

In contrast, according to this configuration, the fixed lens 40 is made of a silicone material having excellent heat resistance. Therefore, 2 operational effects in a mutually balanced relationship (a mutually opposite relationship) can be simultaneously achieved, that is, an operational effect of excellent instrument efficiency and an operational effect of suppressing or preventing thermal degradation of the fixed lens 40, and a significant operational effect can be achieved. Further, instead of this configuration, the fixed lens may be made of a transparent resin material such as acrylic or polycarbonate, a glass material, or a transparent elastomer, as described above.

The lighting device 1 may further include a substrate 21 for fixing the light source 22, and a substrate holder 30 for fixing the substrate 21 to the housing 10. Further, the fixed lens 40 may have: a main body 41 that is substantially circular in a plan view when viewed from the Z direction; and a pair of holding

portions

53, 54 projecting in the opposite radial directions from the edge of the main body 41 so as to face each other in the radial direction of the main body 41. As in the present embodiment, the holding

portions

53 and 54 may be indirectly fixed to the substrate holder 30 via the other member 45, or the holding portions may be directly fixed to the substrate holder.

According to this configuration, since the fixed lens 40 has the pair of holding

portions

53 and 54 protruding in the radial direction from the

edge portions

41a and 41b of the main body 41, the fixed lens 40 can be easily fixed to the substrate holder using the holding

portions

53 and 54. Further, since the fixed lens 40 can be reliably fixed to the substrate holder 30 that fixes the light source 22 by using the holding

portions

53 and 54, it is possible to prevent the optical axis of the fixed lens 40 from being positionally displaced with respect to the light source 22, and to easily emit desired irradiation light. In addition, this structure may not be adopted. For example, the fixed lens may be directly fixed to the housing using a fixing mechanism such as an adhesive or an adhesion member, instead of being indirectly fixed to the housing 10 via the substrate holder 30 by fixing the fixed lens 40 to the substrate holder 30 as in the present configuration.

Further, the fixed lens 40 may have: a main body 41 that is substantially circular in a plan view when viewed from the Z direction; and a pair of holding

portions

53, 54 projecting in the radial direction from the edge portion of the main body 41 so as to face in the radial direction of the main body 41. The transmittance of the main body 41 may be higher than the transmittance of the holding

portions

53 and 54.

According to this configuration, the light passing through the fixed lens 40 can be controlled to the lower side in the Z direction easily, and the light bypassing from the main body 41 to the holding

portions

53 and 54 can be suppressed. Therefore, stray light emitted from the light source 22 and remaining in the lighting device 1 and attenuated can be suppressed, and the efficiency of the appliance can be improved. Further, without adopting this configuration, the transmittance of the main body for fixing the lens may be equal to or lower than the transmittance of the holding portion of the main body. As described above, the fixed lens may not have a holding portion, or may be configured only by a portion that is substantially circular in a plan view when viewed from the Z direction. Further, in the above-described embodiment, the case where the transmission coefficient of the body 41 of the fixed lens 40 is higher than that of the moving lens 60 has been described, but the transmission coefficient of the body of the fixed lens may be equal to or lower than that of the moving lens. In addition, when all of the fixed lenses are formed of the same material, the transmission coefficient of the fixed lenses is preferably higher than that of the moving lenses, but the transmission coefficient of the fixed lenses may be equal to or lower than that of the moving lenses.

The refractive index of the fixed lens 40 may be smaller than that of the moving lens 60.

In this configuration, the light passing through the fixed lens 40 is easily controlled to the lower side in the Z direction, and the light bypassing the main body 41 to the holding

portions

53 and 54 can be suppressed. Therefore, stray light emitted from the light source 22 and remaining in the lighting device 1 and attenuated can be suppressed, and the efficiency of the appliance can be improved. In addition, this configuration is not necessary, and the refractive index of the fixed lens 40 may be equal to or higher than the refractive index of the movable lens 60.

The lighting device 1 may have an inner peripheral surface 85 disposed so as to surround the moving lens 60. Further, the inner peripheral surface 85 may include a low-reflectance inner surface portion which is located on the light emitting side with respect to the Z direction from the position where the moving lens 60 is moved to the side closest to the light source 22 and which has a light reflectance of 15% or less.

According to this configuration, light is less likely to be reflected by the low-reflectance inner surface portion, and light can be absorbed by the low-reflectance inner surface portion. This can reduce the glare when the person looks up at the lighting device 1. As described above, the present configuration may not be adopted, and the lighting device may not have such a low-reflectance inner surface portion.

The moving lens 60 may have a ring-shaped fresnel element 69 protruding toward the light source 22 in the Z direction. Further, the following configuration is also possible: the entire fixed lens 40 can be accommodated in a recess 77 defined by the inner peripheral surface 69a of the annular fresnel element 69 and the end surface 76 of the movable lens 60 on the light source 22 side in the Z direction.

According to this configuration, the efficiency of the device can be improved in the wide-angle control in which the movable lens 60 is present at the wide-angle position, and particularly bright illumination light can be emitted in the wide-angle control. Further, since the Z-direction movement range of the movable lens 60 can be expanded, the degree of freedom of the light distribution of the illumination device 1 can be improved, and excellent light distribution control can be realized.

Further, although not described in detail in the above embodiments, the following configurations are employed to obtain particular operational effects.

Specifically, the moving lens 60 may have 1 or more fresnel elements 69 on the Z-direction upper side and the R-direction outer peripheral side, and particularly, as in the present embodiment, the moving lens 60 may have 1 or more fresnel elements 69 on the Z-direction upper side and the outer peripheral side.

According to this configuration, the light emitted from the light source 22 to the outside in the R direction is easily received by the fresnel element 69. Thus, the appliance efficiency can be increased. Further, although this configuration is preferably employed, it may not be employed, and the moving lens may not have a fresnel element on the upper side and the outer peripheral side in the Z direction.

As shown in fig. 4, the lens effective diameter on the light exit side in the Z direction of the fixed lens 40 (reference numeral 26 denotes a part located on the lens effective diameter of the fixed lens 40) may be larger than the outer diameter of the light source 22, more specifically, the diameter of the circumscribed circle of the annular edge on the lower side in the Z direction of the light source 22, and may be smaller than the lens effective diameter on the light exit side in the Z direction of the moving lens 60 (reference numeral 31 denotes a part located on the lens effective diameter of the moving lens 60). Here, the lens effective diameter is defined as the maximum diameter of the region through which light rays pass in the plane through which light rays pass in the lens. Further, the lens effective diameter may also be defined as the diameter of a parallel bundle of rays coming out of an infinite object point on the optical axis of the lens and passing through the lens.

According to this configuration, the fixed lens 40 can efficiently receive the light emitted from the light source 22, and further, the light converging degree of the fixed lens 40 can be easily adjusted to a light converging degree at which the peripheral light emitted from the fixed lens 40 can be incident on the light incident surface 83 of the movable lens 60 disposed at the narrow-angle position. Further, as in the present embodiment, if the lens effective diameter of the fixed lens 40 is smaller than the inner diameter of the annular fresnel element 69 located on the innermost peripheral side, it is preferable that the peripheral light be more easily incident on the outer edge portion 83a of the light incident surface 83 of the moving lens 60 disposed at the narrow-angle position. These structures are preferably used, but may not be used.

Further, the lens effective diameter on the light exit side in the Z direction of the fixed lens 40 may be 2.5 times or more the diameter of the circumscribed circle.

According to this configuration, the narrow angle performance can be obtained without enlarging the normal device size, and for example, the excellent narrow angle performance of less than 14 ° can be realized at a beam angle of 1/2 ° without enlarging the normal device size. In the case of a device capable of adjusting the optical axis direction by tilting, such as a general-purpose downlight, it is difficult to extend the device in a situation where the ceiling embedding aperture is fixed or the tilt angle of the device is fixed. This structure has a more significant effect. These structures are preferably used, but may not be used.

The fixed lens 40 may have a light condensing degree to the extent that the peripheral light of the light cone (light cone) emitted therefrom can be incident on the outer edge portion 83a of the light incident surface 83 in the Z direction of the movable lens 60 disposed at the narrow-angle position farthest from the light source 22. In other words, the fixed lens 40 may have a light condensing degree such that peripheral light positioned at the periphery of the outgoing light emitted therefrom is incident on the outer edge portion 83a of the light incident surface 83 of the moving lens 60 positioned on the light outgoing side most in the optical axis direction.

According to this configuration, the light emitted from the fixed lens 40 can be efficiently incident on the moving lens 60, and the efficiency of the device can be further improved. These structures are preferably used, but may not be used.

As described above, in embodiment 1, a case where the technical idea of the present disclosure is applied to an embedded downlight is described as an example. However, the lighting device may be suspended from a beam or from a ceiling. Further, the lighting device of the present disclosure may also be a spotlight. Further, in the case where the lighting device of the present disclosure is a downlight or a spotlight, there are various structures of the downlight or the spotlight, but the technique of the present disclosure may be based on any of these various structures of the downlight or the spotlight.

(embodiment 2)

In embodiment 2, an example of a case where the technical idea of the present disclosure is applied to a spotlight will be described. Any configuration of 1 or more of all the configurations described in embodiment 1 can also be applied to the spotlight constituting the illumination device 101 of embodiment 2.

Fig. 23 is a perspective view of the lighting device 101 according to embodiment 2 of the present disclosure. The lighting device 101 is a spotlight, and includes a power supply unit 105, a support unit 110, and a main body unit 115 which also serve as mounting units. The power supply unit 105 is mounted on a wiring duct, not shown. The power supply unit 105 includes a housing unit 106 and a power supply circuit (not shown) housed in the housing unit 106. The power supply circuit is supplied with ac power from an external power supply such as a commercial power supply via a wiring duct. The power supply circuit converts ac power into dc power by, for example, rectifying and smoothing the supplied ac power, and supplies the converted dc power to a light source described later. Although not described in detail, the support portion 110 is attached to one end portion of the elongated housing portion 106 in the longitudinal direction, for example, and extends in a direction substantially orthogonal to the longitudinal direction. The main body 115 incorporates a light source 143 (see fig. 27). The main body 115 is attached to the support 110 so that the optical axis direction of the emitted light emitted from the light source 143 can be changed.

Fig. 24 is an exploded perspective view of main part 120 of main body part 115. As shown in fig. 24, the main portion 120 includes a housing 130, a fixed lens unit 140, a movable lens unit 160, and a cover 195. The housing 130 includes an outer tube 130a and an inner member 130b, and the inner member 130b is inserted into the outer tube 130a from one axial side of the outer tube 130 a. The inner member 130b is fixed by screwing a screw 191 into an inner flange 190 (see fig. 25) of the outer tube 130 a. Further, the fixed lens assembly 140 is screwed into the housing 130, and the movable lens assembly 160 is mounted on the housing 130 in a rotatable manner with respect to the housing 130. Although not described in detail, the cover 195 is a cylindrical member, and is locked to the movable lens unit 160 by using a spring member, not shown, for example. The cover 195 functions to limit the irradiation area of the emitted light.

Fig. 25 is a perspective view of the housing 130 viewed from the light exit side. As shown in fig. 25, the housing 130 has a cylindrical portion 131 having a light emission side opening, and includes a substrate contact portion 133 on a main surface 132 (an end surface on the light emission side). A fixed lens unit 140 (see fig. 24) is fixed to the main surface 132. Fig. 26 is a perspective view of the fixed lens assembly 140. As shown in fig. 26, the fixed lens unit 140 has the same structure as the fixed lens unit 90 according to embodiment 1, and includes a light source module, a substrate holder 145, a fixed lens 148, and a lens mounting member 150. The fixed lens 148 is included in the narrow angle central darkening improvement mechanism. As shown in fig. 27, which is a perspective view showing a state in which the fixed lens 148 and the lens mounting member 150 are detached from the fixed lens assembly 140, the light source module 125 includes a substrate 142 and a light source 143. The substrate 142 has a substantially rectangular shape in plan view. The light source 143 has a disc-like shape and is disposed substantially at the center of the mounting surface of the substrate 142.

The fixed lens unit 140 is fixed to the main surface 132 of the cylindrical portion 131 (see fig. 25) by using 2 bracket fixing members 146 and 2 screws shown in fig. 24, similarly to the structure of embodiment 1. As in embodiment 1, the holder fixing member 146 presses a part of the peripheral edge portion of the light-emitting-side surface of the substrate 142 to the side opposite to the light-emitting side. In a state where the fixed lens unit 140 is fixed to the main surface 132, the surface of the substrate 142 opposite to the light exit side is in contact with the substrate contact portion 133 (see fig. 25), and thus heat generated by the light source 143 can be efficiently discharged.

Fig. 28 is a perspective view of the moving lens assembly 160. The moving lens unit 160 has the same structure as the moving lens unit 75 according to embodiment 1, and includes an optical member 161 and a rotating member 165, and the optical member 161 includes a lens holder 162 and a moving lens 163.

The lighting device 101 has a C-shaped collar 194 shown in a perspective view in fig. 29. The C-shaped retainer 194 is made of a material that is easily elastically deformable, and easily elastically deformable in the R direction. The C-shaped retainer 194 includes a plurality of projections 192 that project outward in the R direction at intervals in the θ direction. On the other hand, the rotating member 165 has an annular groove, not shown, extending in the θ direction on the inner peripheral side, and as shown in fig. 30, has a plurality of through holes 193 communicating with the annular groove and penetrating in the radial direction. The through holes 193 are spaced apart in the θ direction. The C-shaped retainer 194 is fitted into the annular groove and fixed, and the protrusion 192 is inserted into the through hole 193. The portion 192a of the protruding portion 192 protruding outward in the R direction from the rotating member 165 is accommodated in a circumferentially extending groove (e.g., an annular groove), not shown, provided on the inner circumferential surface of the cylindrical portion 131 and extending in the θ direction. Thus, the rotary member 165 is attached to the cylindrical portion 131 so as to be rotatable relative to the cylindrical portion 131 while being positioned substantially unchanged in the Z direction relative to the cylindrical portion 131. If this mounting method is used, the cylindrical portion 131 does not need to be of a divided structure. This can significantly improve the handling property and ease of assembly of the lighting device 101. The rotating member 165 may be fixed to the inner circumferential side of the cylindrical portion 131, similarly to the structure of embodiment 1.

As shown in fig. 28, the lighting device 101 (see fig. 23) according to embodiment 2 also has the rotation member 165 having the grip 164 on the lower side in the Z direction as in the lighting device 1 according to embodiment 1, and as shown in fig. 23, the grip 164 is located on the light emitting side in the Z direction with respect to the cylindrical portion 131 and is exposed to the outside. In the lighting device 101 of embodiment 2, in the same configuration as the lighting device 1 of embodiment 1, a person uses the grip portion 164 to rotate the rotating member 165 relative to the cylindrical portion 131 in the circumferential direction, thereby moving the movable lens 163 relative to the fixed lens 148 in the Z direction.

In embodiment 2, the lighting device 101 also includes: a housing 130; a light source 143 fixed in the housing 130 and emitting light; a movable lens 163 whose distance from the light source 143 in the Z direction (optical axis direction) can be varied; and a narrow-angle central darkening improvement means capable of suppressing the darkening of the irradiation light emitted from the moving lens 163 at the center where the illuminance of the irradiation light on the irradiation surface is lower than that of the peripheral portion, and suppressing the deterioration of the narrow-angle characteristic in which the area of the irradiation light on the irradiation surface is reduced. Also, the fixed lens 148 is included in the narrow-angle central darkening improvement mechanism. Further, the lighting device 101 includes: a light source 143 fixed to the housing 130 and emitting light; and a fixed lens 148 fixed in the housing 130 and having a light emitting surface positioned on a light emitting side in the Z direction (optical axis direction) with respect to the light source 143. The lighting device 101 further includes a movable lens 163, and the movable lens 163 has a light projecting surface disposed on the light emitting side in the Z direction with respect to the fixed lens 148, and is variable in distance in the Z direction from the light source 143. The light incident surface of the fixed lens 148 is substantially planar, while the light emitting surface is convex. The 1 st projection area of the orthogonal projection of the fixed lens 148 on the vertical plane perpendicular to the Z direction is equal to or larger than the 2 nd projection area of the orthogonal projection of the light source 143 on the vertical plane. Therefore, both good narrow-angle characteristics and center darkening suppression can be easily achieved, and light from the light source 143 can be emitted to the irradiation region without loss.

The illumination device 101 can be applied to any configuration applicable to the illumination device 1, and can provide all the operational effects that can be provided by the illumination device 1. For example, the 3 rd projected area of the orthogonal projection of the light incident surface of the fixed lens 148 on the vertical plane may be smaller than the 4 th projected area of the orthogonal projection of the light exit surface of the fixed lens 148 on the vertical plane. The 2 nd projection area may be smaller than the 3 rd projection area.

According to this configuration, the light from the light source 143 can be more efficiently incident on the fixed lens 148. Further, the light from the light source 143 is easily controlled to the lower side in the Z direction, and the light from the fixed lens 148 is easily made to enter the moving lens 163 more efficiently. Thus, the efficiency of the appliance can be further improved.

Further, the 5 th projected area of the orthogonal projection of the light incident surface of the light source 143 side in the Z direction of the moving lens 163 on the vertical plane may be smaller than the 6 th projected area of the orthogonal projection of the light incident surface of the light emitting side in the Z direction of the moving lens 163 on the vertical plane. The 4 th projected area may be smaller than the 5 th projected area.

According to this configuration, the light emitted from the fixed lens 148 can be efficiently incident on the moving lens 163. Further, the irradiation light from the illumination device 101 can be easily controlled to the lower side in the Z direction, and excellent narrow-angle light distribution at a narrow-angle position can be realized.

The distance between the light source 143 and the light incident surface of the fixed lens 148 in the Z direction may be 1.5mm or less.

According to this configuration, light emitted from the light source 143 without entering the fixed lens 148 can be reduced, and the efficiency of the device can be further improved.

The arithmetic average roughness of the light incident surface of the fixed lens 148 may be smaller than the arithmetic average roughness of the light emitting surface of the fixed lens 148.

According to this configuration, the light incident on the light incident surface can be easily controlled, and the light can be easily and efficiently guided to the light emitting surface side. Further, since the light emitted from the light emitting surface can be easily mixed and homogenized, the light on the optical axis side and the light on the peripheral side emitted from the LED can be easily mixed and homogenized as a result. This can suppress color unevenness of the illumination light for each illumination region, and can emit clean and pleasant illumination light. In addition, since the spotlight is subjected to high narrow-angle control, color unevenness is easily noticeable. Therefore, if this structure is employed, a significant operational effect can be obtained.

Further, the Shore (A) hardness of the fixed lens 148 may be 50 to 90.

According to the present structure, the fixed lens 148 has excellent elasticity. Therefore, even if the light source 143 is brought into contact with the light incident surface of the fixed lens 148 at a temperature of the fixed lens 148 during use to achieve excellent device efficiency, the fixed lens 148 is elastically deformed to suppress or prevent damage to the fixed lens 148 or the light source 143. This makes it possible to achieve 2 effects in a trade-off relationship (a relationship opposite to each other), that is, an effect of excellent device efficiency and an effect of suppressing damage to the light source 143 and the fixed lens 148, and thus, a significant effect can be achieved.

The fixed lens 148 may be made of a silicone material containing silicone.

According to this structure, the fixed lens 148 is made of a silicone material having excellent heat resistance. Therefore, 2 operational effects in a mutually balanced relationship (a mutually opposite relationship) can be simultaneously exhibited, that is, an operational effect of excellent instrument efficiency and an operational effect of suppressing or preventing thermal degradation of the fixed lens 148, and a significant operational effect can be achieved.

The lighting device 101 may further include a substrate 142 for fixing the light source 143 and a substrate holder 145 for fixing the substrate 142 to the cylindrical portion 131. As shown in fig. 31, which is a perspective view when the fixed lens 148 is viewed from the light exit side in the Z direction, the fixed lens 148 may include a main body 141 having a substantially circular shape in plan view when viewed from the Z direction, and a pair of holding

portions

153 and 154 that protrude from the edge of the main body 141 in the radial direction so as to face each other in the radial direction of the main body 141. The holding

portions

153 and 154 may be indirectly fixed to the substrate holder 145 via another member 150 (see fig. 26) as in the present embodiment, or the holding portions may be directly fixed to the substrate holder.

According to this configuration, since the fixed lens 148 has the pair of holding

portions

153 and 154 protruding in the radial direction from the edge portion of the main body 141, the fixed lens 148 can be easily fixed to the substrate holder 145 using the holding

portions

153 and 154. Further, since the fixed lens 148 can be reliably fixed to the substrate holder 145 to which the light source 143 is fixed by using the holding

portions

153 and 154, the optical axis of the fixed lens 148 can be prevented from being positionally displaced with respect to the light source 143, and desired irradiation light can be reliably emitted.

The fixed lens 148 may have a main body 141 having a substantially circular shape in plan view when viewed from the Z direction, and a pair of holding

portions

153 and 154 radially protruding from an edge portion of the main body 141 so as to face each other in the radial direction of the main body 141. The transmittance of the main body 141 may be higher than the transmittance of the holding

portions

153 and 154. The refractive index of the fixed lens 148 may be smaller than that of the moving lens 163.

With these configurations, the light passing through the fixed lens 148 can be controlled to the lower side in the Z direction easily, and the light bypassing from the main body 141 to the holding

portions

153 and 164 can be suppressed. Therefore, stray light emitted from the light source 143 and remaining in the lighting device 101 and attenuating the stray light can be suppressed, and the efficiency of the apparatus can be improved.

The lighting device 101 may have an inner circumferential surface disposed so as to surround the moving lens 163. The inner peripheral surface may include a low-reflectance inner surface portion that is located closer to the light exit side than the position where the movable lens 163 is moved closest to the light source 143 in the Z direction and has a light reflectance of 15% or less.

According to this structure, light is less likely to be reflected by the low-reflectance inner surface portion, and light can be absorbed by the low-reflectance inner surface portion. This can reduce the glare when the person looks up at the lighting device 101.

The moving lens 163 may have a ring-shaped fresnel element 169 (fig. 28) projecting toward the light source 143 in the Z direction. The entire fixed lens 148 may be accommodated in a recess 177 defined by the inner circumferential surface 169a of the annular fresnel element 169 and the end surface 176 of the movable lens 163 on the light source 143 side in the Z direction.

With this configuration, the device efficiency can be improved in the wide-angle control for moving the lens 163 to the wide-angle position, and particularly bright illumination light can be emitted in the wide-angle control. Further, since the moving range of the moving lens 163 in the Z direction can be enlarged, the degree of freedom of the light distribution of the illumination device 101 can be improved, and the illumination device 101 excellent in the light distribution control can be realized.

As described above, in embodiment 1, an example of applying the technical idea of the present disclosure to a downlight is described, and in embodiment 2, an example of applying the technical idea of the present disclosure to a spotlight is described. However, the technical idea of the present disclosure may be applied to any lighting device other than downlights and spotlights, for example, ceiling lights, linear lights, floor lights, ceiling lights, and the like.

In short, the lighting device may be any type of lighting device as long as it has a structure including: a housing; a light source fixed in the housing and emitting light; a fixed lens fixed in the housing and having a light emitting surface positioned on a light emitting side in an optical axis direction with respect to the light source; and a movable lens having a light projecting surface disposed on a light emitting side in an optical axis direction with respect to the fixed lens, the movable lens being capable of varying a distance from the light source in the optical axis direction; the light incident surface of the fixed lens is substantially planar, while the light exit surface is convex; the 1 st projection area of the orthographic projection of the fixed lens on a vertical plane vertical to the optical axis direction is more than or equal to the 2 nd projection area of the orthographic projection of the light source on the vertical plane.

In addition, the illumination device 201 may be manufactured to be different from the illumination devices of all the embodiments and the modification described so far only in the following points: the light incident surface 234 of the fixed lens 248 is not substantially planar, but as shown in the schematic cross-sectional view shown in fig. 32, the light incident surface 234 of the fixed lens 248 has an annular fresnel element 278 protruding toward the substrate 221 side in the Z direction on the outer circumferential side in the radial direction.

In this case, it is more preferable that the tip (Z-direction upper end) 278a of the fresnel element 278 be located closer to the substrate 221 in the Z direction than the position shifted to the 1mm light emission side in the Z direction with respect to the tip on the light emission side of the light source 222. Further, the Z-direction position of the front end 278a of the fresnel element 278 is more preferably coincident with the Z-direction position of the front end (Z-direction lower end) 222a on the light emission side of the light source 222, or is located closer to the substrate 221 than the Z-direction position of the front end 222a on the light emission side of the light source 222, and in this case, the front end 278a of the fresnel element 278 may be in contact with the substrate 221.

With such an illumination device, the light from the light source 222 can be efficiently made incident on the fixed lens 248, and particularly, when the front end 222a of the light source 222 on the light emitting side is surrounded in the radial direction by the annular fresnel element 278, the light from the light source 222 can be made incident on the fixed lens 248 more efficiently. Thus, a lighting device having excellent appliance efficiency can be realized.

(embodiment 3)

The case where the narrow-angle central darkening improving mechanism includes the fixed lens 40 is described for the lighting apparatus (ceiling lamp) 1 of embodiment 1, and the case where the lighting apparatus 1 includes the fixed lens 40 and the movable lens 60 is also described. The case where the lighting device 1 has a two-lens structure (a doublet lens structure) is described. However, the lighting device may not have a fixed lens. In embodiment 3, a case where the lighting device 301 is a ceiling lamp having only the movable lens 360 without a fixed lens is described.

Fig. 33 is a perspective view of the illumination device 301 according to embodiment 3, and fig. 34 is a perspective view of the illumination device 301 viewed from another direction. As shown in fig. 33, the lighting device 301 is an embedded general ceiling lamp having an optical axis adjusting member 317 similarly to the lighting device 1 of embodiment 1, and can change the Z direction (optical axis direction) to a desired angle with respect to the vertical direction. As shown in fig. 34, the lighting device 301 has a two-part structure including a 1 st member 310a, a 2 nd member 310b, and a bolt 398, as in the case of the lighting device 1. The 1 st member 310a and the 2 nd member 310b are integrally fixed by a bolt 398, thereby constituting a housing 310. The structure for fixing the lighting device 301 to the periphery of the embedded hole is the same as that of embodiment 1, and therefore, the description thereof is omitted.

Fig. 35 is an exploded perspective view of a main part of the lighting device 301. As shown in fig. 35, the illumination device 301 includes the 1 st member 310a, the 2 nd member 310b, the light source module 325, a rotating member 380, a substrate holder 330, a lens holder 370, and a moving lens 360. The light source module 325 includes a substrate 321 and a light source 322, and the light source 322 is fixed to a mounting surface on the light emitting side of the substrate 321. These components or portions have the same structure as the corresponding components or portions in the lighting device 1 of embodiment 1. These components or portions are made of, for example, the same material as the corresponding components or portions in the lighting device 1.

Similarly to embodiment 1, the light source module 325 is fixed to the main surface 311 of the housing 310 by bolts, not shown, while being held by the substrate holder 330. Further, with the same configuration as that of embodiment 1, the movable lens 360 is fixed to the lens holder 370, and the fitting claw 378, which is an example of a fitting portion of the lens holder 370, is movably fitted in the inclined groove (spiral groove) 381 of the rotary member 380. Thus, the movable lens unit 375 shown in a perspective view in fig. 36 is configured.

Then, with the same structure as that of embodiment 2, the illumination device 301 is configured by using the C-shaped retainer 394 that has the projection 394a (see fig. 36) as an example of the guide locking portion and is elastically deformable for the movable lens assembly 375 and fitting the projection 394a in the groove 385 (see fig. 35) so as to be movable in the θ direction, and the groove 385 is provided on the inner peripheral surface of the housing 310 in which the 1 st and 2

nd members

310a and 310b are fixed to each other and integrated, and extends in the circumferential direction. In addition, the movable lens assembly 375 may be fixed to the housing 310 using the structure described in embodiment 1, instead of the C-shaped retainer 394.

Next, a mechanism for improving the narrow-angle central dimming of the illumination device 301 according to embodiment 3 will be described. Fig. 37 is a perspective view of the movable lens 360 viewed from the light incident side, and fig. 38 is a perspective view of the movable lens 360 viewed from the light emitting side. Fig. 39 is a cross-sectional view of the moving lens 360 cut along a plane passing through the optical axis thereof. As shown in fig. 37, the moving lens 360 has a ring-shaped fresnel element 369 on the Z-direction upper side and the R-direction outer side. In the example shown in fig. 37, the moving lens 360 has only 1 annular fresnel element 369 on the Z-direction upper side, but the moving lens 360 may have a plurality of annular fresnel elements having different inner diameters on the Z-direction upper side.

As shown in fig. 39, the moving lens 360 includes a dome-shaped portion 351, a flange portion 352, and an annular fresnel element 353 at an end portion on the light exit side. The dome-shaped portion 351 is located at the center in the R direction and has a convex dome shape on the lower side in the Z direction. The flange portion 352 is located at the outer end in the R direction and projects outward in the R direction. Further, the fresnel element 353 is located between the dome-shaped portion 351 and the flange portion 352 in the R direction, and protrudes downward in the Z direction.

Further, as shown in fig. 39, the fresnel element 369 has a reflecting surface 334 as an outer peripheral surface on the outer side in the R direction. The reflecting surface 334 is an annular tapered surface centered on the optical axis X of the moving lens 360, and is gradually enlarged in diameter from the upper end toward the lower end. The reflecting surface 334 reflects the light diffused radially outward toward the light emitting surface 333, thereby improving the light use efficiency. The reflecting surface 334 is a so-called total reflection surface, and totally reflects light incident at an angle equal to or greater than a critical angle. The upper end of the reflecting surface 334 is positioned at the upper end of the moving lens 360, and the lower end of the reflecting surface 334 is connected to the flange 352.

The reflecting surface 334 is included in the narrow-angle central darkening improving mechanism. Specifically, the reflecting surface 334 includes an inner convex region 334a that is convex toward the optical axis X and an outer convex region 334b that is convex toward the side opposite to the optical axis X. In particular, when the distance between the light source 322 and the moving lens 360 is close and the light distribution angle is increased, the inner convex region 334a reflects the light that has diffused outward in the R direction toward the right below the illumination device 301, and when the light source 322 and the moving lens 360 are separated and the light distribution angle is set to be small, the outer convex region 334b reflects the reached light efficiently toward the right below the illumination device 301. Therefore, when the inner convex region 334a and the outer convex region 34b are formed on the reflection surface 334, the light reflected by the reflection surface 334 can be efficiently irradiated directly below the illumination device 301, and the occurrence of center darkening in which the center of the irradiated region is darkened can be suppressed.

The reflection surface 334 includes a plurality of inner convex regions 334a and outer convex regions 334b, respectively, which may be formed in a wave shape, but preferably includes 1 inner convex region 334a and outer convex region 334b, respectively. The inner convex region 334a is preferably formed closer to the light exit surface 333 than the outer convex region 334b, that is, on the lower end side of the moving lens 360. In the present embodiment, the reflective surface 334 includes 1 inner

convex region

334a and 1 outer convex region 334b, and the continuous inner convex region 334a and outer convex region 334b are formed in the entirety of the reflective surface 334.

The inner convex region 334a and the outer convex region 334b are preferably curved surfaces having no curved portion, and are formed in a ring shape with the optical axis X as a center. In the present embodiment, the inner convex region 334a is gently curved toward the inner side of the moving lens 360, and the outer convex region 334b is gently curved toward the outer side of the moving lens 360. The inner convex region 334a and the outer convex region 334b may be curved surfaces having a constant curvature or curved surfaces having a variable curvature. In the present embodiment, the radius of curvature of the outer convex region 334b is larger than that of the inner convex region 334 a.

In the present embodiment, the width (optical axis direction length) of the outward convex region 334b is wider than the width of the inward convex region 334a, and the area of the outward convex region 334b is larger than the area of the inward convex region 334 a. The area ratio of the inner convex region 334a to the outer convex region 334b is preferably changed as appropriate depending on the curvature of each region, and the area of the outer convex region may be smaller than that of the inner convex region.

When the area of the inner convex region 334a is S1, the radius of curvature of the inner convex region 334a is R1, the area of the outer convex region 334b is S2, the radius of curvature of the outer convex region 334b is R2, and the maximum diameter of the reflection surface 334 is Φ, the moving lens 360 preferably satisfies at least one of the following relationships (1) and (2), and particularly preferably satisfies both of the relationships (1) and (2). When the conditions (1) and (2) are satisfied, the occurrence of the center dimming can be more effectively suppressed. When the area S1 of the inward convex region 334a is small, the curvature is preferably set to be large by decreasing the radius of curvature R1 of the inward convex region 334 a.

(1)R2≥1.5×φ

(2)5×φ×(S1/S2)²≤R1≤25×φ×(S1/S2)²

Next, a dimensional relationship preferably adopted in the illumination device 301 will be described. Fig. 40 is a perspective view of the housing 310 viewed from the Z-direction lower side, and fig. 41 is a perspective view of the lens holder 370. The illumination device 301 has the same structure for preventing the follow-up rotation as described in detail in embodiment 1. Specifically, as shown in fig. 40, the housing 310 has 1 or more columnar portions 350 extending in the Z direction and provided on an inner wall surface 391 of the light source housing chamber 390 housing the light source 322, and preferably has a plurality of columnar portions 350 as in the present embodiment.

As shown in fig. 41, the lens holder 370 has a ring-shaped

portion

371 and 1 or more leg portions 372, and preferably has a plurality of leg portions 372 as in the present embodiment. The leg 372 is an example of a circumferential movement restricting portion, and extends upward in the Z direction from the annular portion 371. The plurality of columnar portions 350 and the plurality of leg portions 372 are arranged at intervals in the θ direction. The leg 372 has a locking surface 377 opening in the R-direction outer side and the Z-direction vertical direction. The locking surface 377 is an example of a locking portion. By locking the columnar portion 350 to the locking surface 377 of the leg portion 372 so as to be relatively movable in the Z direction, the lens holder 370 is prevented from rotating in the circumferential direction with respect to the housing 310, and the movement range of the lens holder 370 in the circumferential direction with respect to the housing 310 is restricted.

Fig. 42 is a diagram illustrating a preferable dimensional relationship for realizing the housing 310, the moving lens 360, and the lens holder 370. As shown in fig. 42, the fresnel element 369 having the highest Z-directional height among the 1 or more annular fresnel elements 369 preferably has a Z-directional height H1 lower than the Z-directional height H2 of the leg 372 having the highest Z-directional height among the 1 or more leg portions 372.

According to this configuration, the moving range of the moving lens 360 in the Z direction can be enlarged.

In addition, among the 1 or more leg portions 372, it is preferable that the height H2 of the leg portion 372 having the highest height in the Z direction is higher than the height H3 of the column portion 350 having the highest height in the Z direction among the 1 or more column portions 350.

According to this configuration, a larger region in the height direction of the leg 372 can be supported by the columnar portion 350. Thus, the wobbling of the moving lens 260 can be suppressed.

Further, it is preferable that the housing 310 has a plurality of column parts 350 and the lens holder 370 has a plurality of leg parts 372.

According to this configuration, when the moving lens 360 moves, the optical axis X of the moving lens 360 can be prevented from being positionally displaced with respect to the light source 322. This makes it easy to emit the irradiation light in a desired direction.

The lighting device 301 may further include a rotating member 380 that is rotatable relative to the housing 310 in the θ direction of the movable lens 360, with the height position in the Z direction of the inner wall surface 391 of the light source housing chamber 390 that houses the light source 322 in the housing 310 being substantially unchanged. Further, the rotating member 380 may have an inclined groove 381. The lens holder 370 may have a fitting claw 378 fitted into the inclined groove 381, and the movable lens 360 may be continuously movable in the Z direction in the housing 310 while rotating about the optical axis X.

According to this configuration, the light distribution variation can be continuously performed, and the desired illumination light can be easily set.

The housing 310 may have a guide portion on an inner wall surface 391 (see fig. 40) for movably guiding the rotating member 380 in the θ direction, and the guide portion may be a circumferentially extending groove 385 extending in the θ direction. Referring to fig. 36, the protrusion 394a of the C-shaped retainer 394 may be locked to the circumferentially extending groove 385 so as to be relatively movable in the θ direction. The housing 310 may have a structure that can be divided into a plurality of members, and may include, for example, the 1 st member 310a and the 2 nd member 310 b.

According to this configuration, the falling of the rotating member 380 can be reliably prevented, and the assembling performance and the disassembling performance of the rotating member 380 can be improved. Further, heat is easily dissipated from the gap between the 1 st and 2

nd members

310a and 310b integrated by the bolts 398 to form the annular housing 310, and as a result, the heat dissipation performance of the lighting device 301 can be improved.

The surface reflectance of the case 310 may be 15% or less.

According to this configuration, it is possible to suppress light that is reflected on the inner peripheral surface of the housing 310 and becomes uncontrollable, and to suppress light distribution disturbance of the irradiation light.

The surface reflectance of the case 310 may be 70% or more.

According to this configuration, the housing 310 can be prevented from being thermally confined, and thermal degradation of the housing 310 can be prevented.

Referring to fig. 42, the light source 322 may have a disc shape. Further, the inner diameter L1 of the end portion of the fresnel element 369 located innermost in the R direction of the moving lens 360 among the 1 or more annular fresnel elements 369 on the side opposite to the light exit side in the Z direction may be larger than the outer diameter L2 of the light source 322.

According to this configuration, the amount of light entering the light source 322 toward the R direction inner side of the fresnel element 369 located at the innermost side can be increased, the light not entering the moving lens 360 can be reduced, and the device efficiency can be increased.

(embodiment 4)

In embodiment 4, a case where the lighting device is a spotlight and the center dimming suppression is performed by moving only the lens without using a fixed lens while maintaining a good narrow angle control has been described. Fig. 43 is a perspective view of a lighting device 401 according to embodiment 4 of the present disclosure. The lighting device 401 is a spotlight, and includes a power supply unit 405, a support unit 408, and a main body 415 which also serve as a mounting unit. The power supply unit 405 is mounted in a wiring duct, not shown. The power supply unit 405 includes a housing unit 406 and a power supply circuit (not shown) housed in the housing unit 406. The power supply circuit is supplied with ac power from an external power supply such as a commercial power supply via a wiring duct. The power supply circuit converts ac power into dc power by, for example, rectifying and smoothing the supplied ac power, and supplies the converted dc power to a light source described later. The support portion 408 is attached to one end of the elongated housing portion 406 in the longitudinal direction, for example, and extends in a direction substantially orthogonal to the longitudinal direction. The main body 415 incorporates a light source 422 (see fig. 44). The main body 415 is attached to the support 408 so that the optical axis direction of the emitted light emitted from the light source 422 can be changed.

Fig. 44 is an exploded perspective view of a main portion 420 of the main body portion 415. As shown in fig. 44, the main portion 420 includes a housing 410, a movable lens 460, a lens holder 470, a rotating member 480, a C-shaped stopper ring 494, and a cover 495. The housing 410 has an outer cylindrical member 411 and an inner member 412. The inner member 412 is disposed on the outer tubular member 411 from the side opposite to the light exit side in the Z direction of the outer tubular member 411. An end surface on the light emission side in the Z direction of the inner member 412 is fixed to an upper end surface in the Z direction of an inner annular flange 411a that is provided on the light emission side in the Z direction of the outer cylindrical member 411 and protrudes radially inward from the inner circumferential surface of the outer cylindrical member 411. For this fixation, bolts 435 and screw holes 411b provided in the inner annular flange portion 411a are used.

As shown in fig. 44, the light source module 425 is fixed to the center portion of the end surface of the inner member 412 on the light exit side in the Z direction. As shown in fig. 45, the movable lens 460, the lens holder 470, and the rotating member 480 are assembled to form a movable lens assembly 475 in the same manner as in embodiment 3. The rotary member 480 further includes a plurality of protrusion insertion holes 498 provided at intervals in the θ direction. Protrusion 494a of C-shaped stop ring 494 is inserted through protrusion insertion hole 498 through which C-shaped stop ring 494 is assembled on moving lens assembly 475. The front end side of the projection 494a projects outward in the R direction than the outer peripheral surface of the rotary member 480. The front end side of the projection 494a is received in a circumferentially extending groove 485 (see fig. 44) provided in the inner circumferential surface of the outer cylindrical member 411 and extending in the θ direction, whereby the housing 410, the movable lens unit 475, and the C-shaped stopper ring 494 are integrated. The cover 495 is a cylindrical member, and is locked to the movable lens unit 460 by using a spring member, not shown, for example. The cap 495 functions to limit an irradiation area of the emitted light.

Fig. 46 is a perspective view of the movable lens 460 viewed from the upper side in the Z direction, and fig. 47 is a perspective view of the outer tube member 411 viewed from the lower side in the Z direction, in a state where the inner member 412 to which the light source module 425 is fixed in the middle of the outer tube member 411. Fig. 48 is a perspective view of the lens holder 470. As shown in fig. 46, the shift lens 460 includes a ring-shaped fresnel element 469 protruding upward in the Z direction, similarly to the shift lens 360 according to embodiment 3. Although not shown, the reflection surface 434 of the moving lens 460 includes an inner convex region that is convex toward the optical axis X and an outer convex region that is convex toward the side opposite to the optical axis X, as in the moving lens 360, and the reflection surface 434 is included in the narrow-angle central darkening improvement mechanism.

As shown in fig. 47, the housing 410 preferably has 1 or more columnar portions 450 provided on an inner wall surface 491 of the light source housing chamber 490 housing the light source 422 and extending in the Z direction, and a plurality of columnar portions 450 as in the present embodiment. As shown in fig. 48, the lens holder 470 includes an annular portion 471 and at least one leg 472, and preferably includes a plurality of legs 472 as in the present embodiment.

The leg 472 is an example of a circumferential movement restricting portion, and extends upward in the Z direction from the annular portion 471. The plurality of columnar portions 450 and the plurality of leg portions 472 are arranged at intervals in the θ direction. The leg 472 has a locking surface 477 opened outward in the R direction and in the up-down direction in the Z direction on the outer side surface on the outer side in the R direction. By locking the columnar portion 450 to the locking surface 477 of the leg 472 so as to be relatively movable in the Z direction, the lens holder 470 is prevented from rotating in the circumferential direction with respect to the housing 410.

As described above, in the illumination device 401, as in the illumination device 301 according to embodiment 3, the moving lens 460 includes the reflecting surface 434 which is formed in a ring shape with the optical axis as the center and included in the narrow-angle central darkening improvement mechanism. Further, the reflecting surface 434 includes an inner convex region that is convex toward the optical axis side and an outer convex region that is convex toward the side opposite to the optical axis.

Therefore, both good narrow-angle characteristics and suppression of center darkening are easily achieved, and light from the light source 422 is easily emitted to the irradiation region without loss.

In addition, in the lighting device 401, as in the lighting device 301 of embodiment 3, it is preferable that a plurality of configurations described below are satisfied.

Specifically, the moving lens 460 may include 1 or more annular fresnel elements 469 protruding in the Z direction on the side opposite to the light exit side. The lighting device 401 may further include a lens holder 470, the lens holder 470 holding the moving lens 460, being disposed outside the moving lens 460 in the R direction, and including 1 or more leg portions (circumferential movement restricting portions) 472 that come into contact with the housing 410 to restrict the circumferential movement range of the moving lens 460. Further, among the 1 or more annular fresnel elements 469, the fresnel element 469 having the highest height in the Z direction may have a height lower than the height of the leg 472 having the highest height in the Z direction among the 1 or more leg 472.

According to this configuration, the moving range of the moving lens 460 in the Z direction can be enlarged. Further, among the 1 or more annular fresnel elements 469, the fresnel element 469 having the highest height in the Z direction may have a height lower than the leg 472 having the lowest height in the Z direction among the 1 or more leg 472.

The housing 410 may have 1 or more columnar portions 450 extending substantially in the Z direction on an inner wall surface 491 defining a light source accommodation chamber 490 in which the light source 422 is accommodated. The lens holder 470 may have an annular portion 471, and the circumferential movement restricting portion may be a leg portion 472 that protrudes from the annular portion 471 toward the side opposite to the light emitting side in the Z direction and has a locking surface 477 (locking portion) that locks the columnar portion 450. Further, the height of the leg 472 having the highest height in the Z direction among the 1 or more legs 472 may be higher than the height of the columnar portion 450 having the highest height in the Z direction among the 1 or more columnar portions 450.

According to this configuration, a larger region in the height direction of the columnar portion 450 can be supported by the leg 472. Thus, the wobbling of the moving lens 460 can be suppressed.

In addition, the housing 410 may have a plurality of column portions 450, and the lens holder 470 may have a plurality of leg portions 472.

According to this configuration, when the moving lens 460 moves, the optical axis of the moving lens 460 can be suppressed from being displaced from the light source position. This makes it easy to emit the irradiation light in a desired direction.

The lighting device 401 may further include a rotary member 480, and the rotary member 480 may be relatively rotatable in the θ direction of the movable lens 460 with respect to the housing 410 in a state where the height position in the Z direction on the inner wall surface 491 of the light source housing chamber 490 in the housing 410 defining the light source 422 is substantially unchanged. The rotary member 480 may have an inclined groove (spiral groove) 481 (see fig. 45). The lens holder 470 may have a fitting claw (engaging portion) 478 fitted to the inclined groove 481, and the moving lens 460 may be continuously moved in the Z direction in the housing 410 while rotating around the optical axis.

The surface reflectance of the case 410 may be 15% or less.

According to this configuration, light that is reflected on the inner peripheral surface of the housing 410 and becomes uncontrollable can be suppressed, and disturbance in the distribution of the irradiated light can be suppressed.

The surface reflectance of the case 410 may be 70% or more.

According to this configuration, the housing 410 can be prevented from being thermally confined, and thermal degradation of the housing 410 can be prevented.

Further, the following structure may be adopted to increase the efficiency of the appliance. Fig. 49 is a perspective view for explaining the relative position of the light source module 425 with respect to the moving lens 460, and is a perspective view when the moving lens 460 and the light source module 425 are viewed obliquely from below the moving lens 460. Fig. 50 is a perspective view for explaining the relative position of the light source module 425 with respect to the moving lens 460, and is a plan view when the moving lens 460 and the light source module 425 are viewed from above in the Z direction. As shown in fig. 49, the light source 422 of the light source module 425 may have a circular plate shape. As shown in fig. 49 and 50, the entire light source module 425 may overlap the region surrounded by the annular fresnel element 469 of the moving lens 460 when viewed from the Z direction, and the central axis of the light source 422 may substantially coincide with the central axis of the fresnel element 469. That is, the inner diameter of the end of the fresnel element 469 located on the innermost side in the R direction of the moving lens 460 among the 1 or more annular fresnel elements 469 on the side opposite to the light exit side in the Z direction may be larger than the outer diameter of the light source 422.

According to this configuration, the amount of light incident on the R direction inner side of the fresnel element 469 located on the innermost side among the light emitted from the light source 422 can be increased, and light not incident on the moving lens 460 can be reduced, thereby increasing the efficiency of the device.

(other embodiments)

In embodiments 1 and 2 and their modifications, the case where the moving

lenses

60 and 163 and the fixed

lenses

40 and 148 are mounted to achieve favorable narrow angle control and suppression of center darkening is described. In the embodiments 3 and 4 and their modifications, the case where the fixed lens is not mounted, and instead the

movable lenses

360 and 460 are shaped into a special shape, thereby achieving favorable narrow angle control and suppression of center darkening is described. In embodiments 3 and 4, the component sizes indicated by H1 to H3 in fig. 42 and the component sizes indicated by L1 and L2 define a preferable size relationship to be realized. However, in the illumination device having the

movable lenses

360 and 460 described in embodiments 3 and 4, the relationship between the sizes of these components may not be established.

Note that, although the description is made for the sake of safety, the dimensional relationship established between the dimensions of these components described in embodiment 3 and embodiment 4 may or may not be established for the illumination device described in embodiment 1, the illumination device described in embodiment 2, and the illumination device according to the modification of embodiment 1 and embodiment 2. In the lighting device having the moving

lenses

360 and 460 described in embodiments 3 and 4, the surface reflectance of the housing may not be 15% or less, or the surface reflectance of the housing may not be 70% or more. The lighting devices according to embodiments 1 and 2 and their modifications may or may not have the structure in which the surface reflectance of the housing is 15% or less as described in embodiments 3 and 4. Alternatively, the lighting devices according to embodiments 1 and 2 and their modifications may or may not have the structure in which the surface reflectance of the housing is 70% or more as described in embodiments 3 and 4.

In the lighting device having the fixed lens and the movable lens, the movable lens may be the movable lens having the inner convex region and the outer convex region described in embodiments 3 and 4, or may be a movable lens having no both of the inner convex region and the outer convex region. Any configuration adopted for the ceiling lamps of the

lighting devices

1 and 301 according to embodiments 1 and 3 may be adopted for the spot lights of the

lighting devices

101 and 401 according to embodiments 2 and 4. On the contrary, any configuration adopted as the spotlight of the

lighting devices

101 and 401 according to embodiments 2 and 4 may be adopted as the ceiling lamp of the

lighting devices

1 and 301 according to embodiments 1 and 3.

Further, in the lighting device of the present disclosure, the output of the light emitting portion (e.g., light emitting element (e.g., LED)) may be any output. However, as in the

lighting devices

301 and 401, a configuration in which the inner convex region 334a and the outer convex region 334b are provided on the reflection surface 334 of the moving lens 360 without a fixed lens to suppress the center dimming and to control the narrow angle well is preferably mounted on a high-output member having a light emitting part (for example, an LED) whose output is larger than 15W (watt). Further, the configuration in which the central dimming is suppressed and the excellent narrow angle control is performed by providing the fixed lens and the moving lens as in the

lighting devices

1 and 101 is preferably mounted on a low output member having an output of a light emitting unit (for example, LED) smaller than 15W (watt).

(Lighting device for beneficial effect)

In embodiments 3 and 4, it is preferable to expand the moving range of the moving lens, prevent the moving lens from wobbling, increase the tool efficiency, and the like, with respect to the plurality of size relationships described with respect to the component sizes indicated by H1 to H3 and the component sizes indicated by L1 and L2 in fig. 42. Thus, in comparison with the lighting devices according to embodiment 3 and embodiment 4 and their modifications, even if a lighting device is manufactured in which the movable lens is changed to a movable lens having no both of the inward convex region and the outward convex region, it is possible to expand the moving range of the movable lens, prevent the movable lens from wobbling, and increase the efficiency of the appliance. Therefore, in comparison with the lighting devices according to embodiment 3 and embodiment 4 and their modifications, the advantageous operational effects described in embodiment 3 and embodiment 4 can be achieved for a lighting device (for example, a ceiling lamp, a spotlight, and the like) that differs only in that the moving lens is changed to a moving lens that does not have both the inward convex region and the outward convex region. Although the description is given with caution, such an illumination device does not have a fixed lens.

Description of the reference symbols

1. 101, 301, 401 lighting devices; 10. 130, 310, 410 housing; 21. 142, 321 base plate; 22. 143, 322, 422 light sources; 30. 145, 330 substrate holder; 40. 148 a fixed lens; 41. 141 a body to which the lens is fixed; 53. 54, 153, 154 holding parts; 60. 163, 360, 460 moving the lens; 69. 169, 369, 469 moving the fresnel elements of the lens; 69a, 169a on the inner periphery of the Fresnel element; 76. 176 moving the end face of the lens; 77. 177 moving the concave portion of the lens; 83 into the light surface; 85 inner peripheral surface; 86 a light incident surface; 87 a light projection surface; 88 light exit face; 310a part 1 of the housing; 310b part 2 of the housing; 334. 434 moving the reflective surface of the lens; 334a, an inwardly convex region; 334b an outer convex region; 350. 450 a columnar portion; 370. 470 a lens holder; 371. 471 an annular portion; 372. 472 a leg portion; 377. 477 a locking surface; 378. 478 engaging claws; 380. 480 a rotating component; 381. 481 an inclined groove; 385 a circumferentially extending groove; 390. 490 a light source accommodating chamber; 391. 491 inner wall surface of the light source accommodating chamber; 394. 494C type retaining ring; 394a, 494a projection; 405 a power supply unit; 406 an accommodating part; 408 a support portion; 415 a main body part; height of the highest fresnel element of H1; height of the highest leg of H2; height of the highest pillar of H3; p is a vertical plane; the inner diameter of the upper end of the L1 fresnel element; l2 outer diameter of disc-shaped light source; s1 projection area No. 2; s2 projection area No. 1; s21 projection area No. 3; s22 projection area No. 4; s31 projection area No. 5; s32 projection area 6; the X-axis moves the optical axis of the lens.

Claims

1. A lighting device, characterized in that,

have:

case;

a light source, which is fixed in the above-mentioned casing and emits light;

Moving the lens, the distance from the light source in the direction of the optical axis can be changed; and

The narrow-angle center dimming improvement mechanism can suppress dimming of the irradiated light emitted from the movable lens in the center of the irradiated surface where the illuminance is lower than the illuminance of the peripheral part, and can also suppress the irradiated light in the region of the irradiated surface Reduced narrow-angle characteristics decrease.

2. A lighting device, characterized in that,

have:

case;

a light source, which is fixed in the above-mentioned casing and emits light;

A fixed lens is included in the narrow-angle center dimming improvement mechanism, and is fixed in the housing and has a light emitting surface positioned on the light emitting side in the optical axis direction relative to the light source, and the narrow-angle center dimming improvement mechanism can It is possible to suppress dimming of the center of the irradiation surface where the illuminance of the irradiation light is lower than the illuminance of the peripheral portion, and also to suppress the reduction of the narrow-angle characteristic when the irradiation light becomes smaller in the region of the irradiation surface; and

The movable lens has a light projection surface disposed on the light emitting side in the optical axis direction rather than the fixed lens, and the distance between the movable lens and the light source in the optical axis direction can be varied,

The light incident surface of the fixed lens is substantially flat, and the light exit surface is convex.

The first projection area of the orthographic projection of the fixed lens on the vertical plane perpendicular to the optical axis direction is equal to or greater than the second projection area of the orthographic projection of the light source on the vertical plane.

3. The lighting device according to claim 2, characterized in that,

The third projected area of the orthographic projection of the light incident surface on the vertical plane is smaller than the fourth projected area of the orthographic projection of the light exit surface on the vertical plane, and the second projected area is smaller than the third projected area.

4. The lighting device of claim 3, wherein

The fifth projection area of the orthographic projection of the light incident surface on the light source side in the optical axis direction of the movable lens to the vertical plane is smaller than the sixth projection area of the orthographic projection of the light projection surface to the vertical plane,

The fourth projected area is smaller than the fifth projected area.

5. The lighting device according to any one of claims 2 to 4, characterized in that:

The distance between the light source and the light incident surface in the optical axis direction is 1.5 mm or less.

6. The lighting device according to any one of claims 2 to 5, characterized in that:

The arithmetic mean roughness of the light incident surface is smaller than the arithmetic mean roughness of the light exit surface.

7. The lighting device according to any one of claims 2 to 6, wherein

The Shore A hardness of the above-mentioned fixed lens is 50-90.

8. The lighting device according to any one of claims 2 to 7, wherein

The above-mentioned fixed lens is composed of a silicone material containing silicone.

9. The lighting device according to any one of claims 2 to 8, characterized in that:

have:

a substrate for fixing the above-mentioned light source; and

a substrate holder for fixing the substrate to the housing,

The fixed lens includes a main body that is substantially circular in plan view when viewed from the optical axis direction, and a pair of holding portions protruding from an edge of the main body in the radial direction so as to face each other in the radial direction of the main body,

The holding portion is directly fixed to the substrate holder, or indirectly fixed to the substrate holder via another member.

10. The lighting device according to any one of claims 2 to 9, characterized in that:

The transmittance of the main body is higher than the transmittance of the holding portion.

11. The lighting device according to any one of claims 2 to 10, characterized in that:

The refractive index of the above-mentioned fixed lens is smaller than that of the above-mentioned movable lens.

12. The lighting device according to any one of claims 2 to 11, characterized in that:

The above-mentioned lighting device has an inner peripheral surface arranged so as to surround the above-mentioned movable lens,

The inner peripheral surface includes a low reflectance inner surface portion having a light reflectance of 15% or less, which is located on the light exit side relative to the position where the movable lens is moved most toward the light source side with respect to the optical axis direction.

13. The lighting device according to any one of claims 2 to 12, characterized in that:

The movable lens has a ring-shaped Fresnel element protruding toward the light source side in the optical axis direction,

The entirety of the fixed lens may be accommodated in a concave portion defined by the inner peripheral surface of the annular Fresnel element and the end surface of the movable lens on the light source side in the optical axis direction.

14. The lighting device according to any one of claims 1 to 13, characterized in that:

The movable lens includes a reflection surface formed in a ring shape with the optical axis as the center and included in the narrow-angle center darkening improvement mechanism,

The reflecting surface includes an inner convex region that is convex toward the optical axis side and an outer convex region that is convex toward the opposite side of the optical axis.

15. The lighting device according to any one of claims 1 to 14, characterized in that:

The movable lens has one or more annular Fresnel elements protruding toward the opposite side of the light exit side in the optical axis direction,

The illumination device includes a lens holder that holds the movable lens, is disposed radially outward of the movable lens, and includes one or more circumferential directions that are in contact with the housing to limit a range of movement in the circumferential direction of the movable lens. Movement Restriction Department,

The height of the Fresnel element having the highest height in the optical axis direction among the one or more annular Fresnel elements is higher than that of the one or more circumferential movement restricting portions having the highest height in the optical axis direction. The height in the optical axis direction of the circumferential movement restricting portion is low.

16. The lighting device of claim 15, wherein

The housing has one or more columnar portions extending substantially in the optical axis direction on an inner wall surface that defines a light source accommodating chamber for accommodating the light source,

The above-mentioned lens holder has an annular portion,

The circumferential movement restricting portion is a leg portion that protrudes from the annular portion to a side opposite to the light emitting side in the optical axis direction and includes a locking portion for locking the columnar portion,

The height of the leg part having the highest height in the optical axis direction among one or more of the leg parts is higher than the height of the columnar part having the highest height in the optical axis direction among the one or more columnar parts.

17. The lighting device of claim 16, wherein

The casing has a plurality of the columnar parts,

The above-mentioned lens holder has a plurality of the above-mentioned legs.

18. The lighting device according to any one of claims 15 to 17, characterized in that:

The above-mentioned lighting device includes a rotating member which can be positioned at a height relative to the above-mentioned casing in a state where the height position in the above-mentioned optical axis direction is substantially constant on an inner wall surface of the above-mentioned casing that defines a light source accommodating chamber that accommodates the above-mentioned light source. The circumferential direction of the above-mentioned moving lens is relatively rotated, and the rotating member has a helical groove,

The lens holder has a fitting portion to be fitted into the annular groove, and the movable lens can continuously move in the optical axis direction within the housing while being rotated about the optical axis.

19. The lighting device of claim 18, wherein

The housing has, on the inner wall surface, a guide portion that guides the rotating member so as to be able to move in the circumferential direction,

The lighting device includes a guide locking portion that is locked to the guide portion so as to be relatively movable in the circumferential direction,

The above-mentioned housing has a structure capable of being divided into a plurality of parts.

20. The lighting device according to any one of claims 1 to 19, characterized in that:

The surface reflectance of the casing is 15% or less.

21. The lighting device according to any one of claims 1 to 19, characterized in that:

The surface reflectance of the casing is 70% or more.

22. The lighting device according to any one of claims 1 to 21, characterized in that:

The above-mentioned light source has a disk-like shape,

Among the one or more annular Fresnel elements, the inner diameter of the Fresnel element located at the innermost in the radial direction of the movable lens has an inner diameter at an end opposite to the light exit side in the optical axis direction than the outer diameter of the light source. big.