CN209926035U - Lighting apparatus - Google Patents

Abstract

A lighting fixture (10) is provided with: a tubular light guide (16) having a light extraction structure (20) on the outer peripheral surface (16 a); a light source group (19) composed of a plurality of light sources (18) arranged in a ring shape along the upper end surface of the light guide body (16) in the axial direction; a cylindrical outer cylinder member (14) disposed around the outer side of the light guide (16); the base member (12) is provided so as to cover one axial end of the light guide (16) and the outer cylinder member (14), and is provided with a drive circuit (13) for driving the light source group (19) to emit light.

Description

lighting fixtures

technical field

The present disclosure relates to lighting fixtures.

Background technique

Conventionally, Japanese Unexamined Patent Application Publication No. 2011-150971 describes a lighting fixture including: a fixture body; an LED light-emitting part provided on the fixture body; , an insertion part into which a decoration can be inserted is provided on the outer cylindrical part, and the insertion part can be opened and closed. In this lighting fixture, it is described that the light guide sheet is attached to the inner surface of the inner cylindrical portion, and the light from the LED light-emitting portion is surface-emitted through the light guide sheet.

Utility model content

In the lighting fixture described in Patent Document 1, since the LED light-emitting portion is arranged inside the upper end portion of the inner cylindrical portion, the distance between the LED light-emitting portion and each position in the axial direction of the light guide sheet mounted on the inner surface of the inner cylindrical portion varies. The distance of the light is different and the amount of light reaching is also different. Therefore, the light guide sheet attached to the inner surface of the inner cylindrical portion is bright in the vicinity of the LED light-emitting portion, and darkened at the front end. In addition, since the light guide sheet has no function of controlling the direction of the output light, there is a problem that the light distribution of the lighting fixture cannot be controlled.

An object of the present disclosure is to provide a lighting fixture that can make a cylindrical light guide body emit light uniformly in the axial direction and can design a shape of output light distribution according to the purpose.

The lighting fixture of the present disclosure has: a cylindrical light guide body with a light extraction structure on the outer peripheral surface; a light source group consisting of a plurality of light sources arranged in an annular shape along the upper end surface of the axial direction of the light guide body; a cylindrical outer cylinder member arranged around the outer side of the light guide body; and a base member provided to cover the light guide body and one end portion in the axial direction of the outer cylinder member, and arranged so that the light source Group of light-emitting drive driver circuits.

Further, the inner peripheral surface of the outer cylinder member may be mirror-finished or light-diffusing.

In addition, the light extraction structure may be formed of a dot coating formed by a paint containing a diffusing pigment, or a concave or convex prism.

In addition, the dot coating or the prism may have a certain coverage, or may have a distribution that increases gradually from the upper end surface in the axial direction of the light guide body toward the lower end surface.

In addition, when the light guide body is cut on a plane including the central axis, the prism may have a substantially triangular cross-sectional shape, and may have 10 with respect to an axial line along the outer peripheral surface of the light guide body. ° ~ 40 ° angle.

In addition, the prism may be a substantially conical shape, or may be a groove or a convex portion in which the same cross section is continuous in the circumferential direction.

In addition, the lower end surface of the light guide body in the axial direction may be subjected to uneven processing, embossing processing, or diffusion coating for diffusing and transmitting the light traveling in the light guide body in the axial direction.

Furthermore, the plurality of light sources constituting the light source group may be divided into a plurality of groups in the circumferential direction, and the lighting states may be individually controlled by the drive circuit.

Utility model effect

According to the lighting fixture according to the present disclosure, the cylindrical light guide body can be made to emit light uniformly in the axial direction, and the shape of the output light distribution can be designed according to the purpose.

Description of drawings

FIG. 1 is a side view showing a lighting fixture according to an embodiment of the present disclosure.

FIG. 2 is an exploded perspective view (including a part of an enlarged view) of the lighting fixture shown in FIG. 1 .

FIG. 3 is a diagram for explaining the light distribution emitted from the wall surface of the light guide body.

FIG. 4 is a diagram for explaining the light distribution of the lighting fixture.

FIG. 5 is a diagram showing how light distribution changes depending on the diffusivity of dots.

6 is a partially enlarged perspective view of a light guide body showing an example of a prism constituting a light extraction structure.

7A and 7B are diagrams showing angles of prisms.

8A to 8C are diagrams showing changes in light distribution depending on the angle of the prism, and FIG. 8D is a diagram showing a state in which light is emitted toward the opposing wall surface inside the cylindrical light guide.

Symbol Description

2-ceiling; 4-through hole; 10-lighting fixture; 12-base member; 12a-bottom plate part; 12b-side wall part; 13-drive circuit; 14-outer cylinder member; 16-light guide body; 16a- Outer peripheral surface; 16b-inner peripheral surface; 18-light source; 19-light source group; 20, 20a, 20b-light extraction structure; 22-point; 24a-prism or groove; 24b-prism; A-central axis; La, Lb , Lc, La,b-light distribution; Lg-synthetic light distribution; θ-angle or prism angle.

Detailed ways

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the accompanying drawings. In this description, specific shapes, materials, numerical values, directions, and the like are exemplified for easy understanding of the present disclosure, and can be appropriately changed according to applications, purposes, specifications, and the like. In addition, in the case where a plurality of embodiments, modified examples, and the like are included below, it is assumed from the beginning that they are used in appropriate combination.

FIG. 1 is a side view showing a lighting fixture 10 according to an embodiment of the present disclosure. FIG. 2 is an exploded perspective view (including a partially enlarged view) of the illuminator 10 shown in FIG. 1 . As shown in FIGS. 1 and 2 , the lighting fixture 10 includes a base member 12 , an outer cylinder member 14 , a light guide body 16 , and a light source group 19 . As shown in FIG. 1, the lighting fixture 10 is installed in the through-hole 4 formed in the ceiling 2 as a downlight, for example.

The base member 12 of the luminaire 10 is formed of, for example, a metal member. The base member 12 has a function as a cover member that covers the upper end portion of the lighting fixture 10 . The base member 12 has a circular bottom plate portion 12a and a side wall portion 12b erected on the outer peripheral edge portion of the bottom plate portion 12a. The drive circuit 13 is arranged inside the lighting fixture 10 and on the bottom plate portion 12 a of the base member 12 . The drive circuit 13 controls power supply to the light source group 19 and controls the light emission state (ie, lighting, extinguishing, blinking, dimming, etc.) of the light sources 18 such as LEDs constituting the light source group 19 . In addition, it is preferable to provide an opaque cover member inside the side wall portion 12b of the base member 12 so that the drive circuit 13 cannot be seen from below, in order to improve the appearance of the lighting fixture 10 .

The outer cylinder member 14 is an outer casing member that forms the outer peripheral side surface of the lighting fixture 10 . The outer cylinder member 14 is formed of, for example, synthetic resin or a metal plate. The outer cylinder member 14 is formed in a cylindrical shape, for example. In the present embodiment, the outer cylinder member 14 is formed to have the same diameter as the base member 12 . The outer cylinder member 14 has a function of reflecting light leaked from the light guide body 16 to the outside, and its inner peripheral surface is mirror-finished or light-diffusing. The light-diffusion treatment can be performed by, for example, concavo-convex processing, embossing processing, or diffusion coating.

FIGS. 1 and 2 show an example in which the outer cylinder member 14 is formed in a cylindrical shape with a constant diameter from the upper end surface to the lower end surface, but it is not limited to this. The outer cylinder member 14 may be formed in a truncated cone shape in which the inner diameter becomes larger on the lower end side than on the upper end side. Alternatively, the outer cylinder member 14 may be expanded downward with a flared curved surface.

The light guide body 16 is formed in a cylindrical shape. In FIG. 2 (the same is true for FIG. 6 ), the central axis A of the light guide body 16 is shown by a dashed-dotted line. The light guide body 16 has a function of guiding the light introduced from the upper end surface along the axial direction of the central axis A to the lower end side. The light guide body 16 is preferably formed of, for example, a transparent resin material (eg, acrylic resin) or a glass material.

The light guide body 16 has the light extraction structure 20 on the outer peripheral surface thereof. As shown in the partially enlarged view in FIG. 2 , the light extraction structure 20 is preferably formed by spot coating. This embodiment shows an example in which the circular dots 22 are formed in a staggered manner. The dots 22 may be formed in a matrix shape in the expanded state. The dots 22 are formed by printing or applying a paint containing diffusing pigments.

When forming the light extraction structure 20 by such dot coating, the coverage or arrangement density of the dots 22 may be constant from the upper end surface to the lower end surface in the axial direction of the light guide body 16 . According to this configuration, the amount of light extracted from the inner peripheral surface of the light guide body 16 is large on the upper end surface side and small on the lower end surface side. Therefore, the surface emission state of the inner peripheral surface of the light guide body 16 can be shaded.

On the other hand, the coverage or arrangement density of the dots 22 constituting the dot coating may be gradually increased from the upper end face toward the lower end face in the axial direction of the light guide body 16 . According to this configuration, the amount of light extracted from the inner peripheral surface of the light guide 16 is constant from the upper end surface to the lower end surface. Therefore, the inner peripheral surface of the light guide body 16 can be uniformly surface-emitted in the axial direction.

In addition, the light extraction structure provided on the outer peripheral surface of the light guide body 16 is not limited to spot coating, and may be constituted by fine prisms, grooves, or the like formed on the outer peripheral surface of the light guide body 16 . The shape of the prism and the like will be described later.

In addition, in the present embodiment, the example in which the light guide body 16 is formed in a cylindrical shape with a constant diameter from the upper end surface to the lower end surface is shown, but the present invention is not limited to this. Like the outer cylinder member 14 , the light guide body 16 may be formed such that the inner diameter expands in a truncated cone shape or a flared shape from the upper end surface toward the lower end surface.

It is preferable that the lower end surface in the axial direction of the light guide body 16 is subjected to uneven processing, embossing processing, or diffusion coating. According to this configuration, the light introduced from the upper end surface of the light guide body 16 and advanced in the axial direction in the light guide body 16 can be diffused, transmitted, and emitted by the concavo-convex processing of the lower end surface or the like. Therefore, the light emission state at the lower end surface of the annular light guide body 16 can be uniformized in the circumferential direction. In other words, it is possible to suppress a state in which each light source 18 appears to emit light in a granular shape when the illuminator 10 is viewed from below.

As shown in FIGS. 1 and 2 , the light source group 19 is composed of a plurality of light sources 18 arranged in an annular shape along the upper end surface of the light guide body 16 in the axial direction. The light source 18 is preferably constituted by, for example, LEDs. The plurality of light sources 18 are preferably arranged at equal intervals in the circumferential direction. According to this structure, the surface emission state of the inner peripheral surface of the light guide body 16 can be made uniform in the circumferential direction. However, it is not limited to this, and the arrangement pitch of the plurality of light sources 18 may be made uneven, and the surface emission state of the inner peripheral surface of the light guide body 16 may be shaded in the circumferential direction.

The plurality of light sources 18 constituting the light source group 19 may be provided on the lower surface of the side wall portion 12 b of the base member 12 . In this case, the light source 18 may be exposed and installed on the lower surface of the side wall portion 12b, or may be embedded in the vicinity of the lower surface of the side wall portion 12b. In addition, each light source 18 is electrically connected to the drive circuit 13 via an unillustrated electric wire. Thereby, each light source 18 can receive power supply from the drive circuit 13 and emit light. In addition, the light source group 19 composed of the plurality of light sources 18 may be fixedly arranged on the upper end surface of the light guide body 16 , or may be arranged as another member sandwiched between the base member 12 and the light guide body 16 .

The plurality of light sources 18 constituting the light source group 19 are preferably arranged so as to be in contact with or close to the upper end surface of the cylindrical light guide body 16 so as to face each other. Thereby, the light emitted from the light source 18 can be efficiently introduced into the light guide body 16, and as a result, the inner peripheral surface of the light guide body 16 can be uniformly and brightly surface-emitted in the axial direction.

FIG. 3 is a diagram for explaining the distribution of light emitted from the wall surface of the light guide body 16 . As shown in FIG. 3 , the light extraction structure 20 is provided on the outer peripheral surface 16 a of the light guide body 16 , so that the light distribution La is generated on the inner peripheral side (the left side in FIG. 3 ) of the light guide body 16 . On the outer peripheral side (right side in FIG. 3 ) of the light guide body 16 , a light distribution Lb caused by leakage from between the dot coatings constituting the light extraction structure 20 occurs. In addition, the light distribution Lc that passes through the inside of the light guide body 16 in the axial direction and is emitted from the lower end surface in the axial direction.

FIG. 4 is a diagram for explaining the light distribution of the lighting fixture 10 . As shown in FIG. 4 , on the inner peripheral surface 16 b side of the light guide body 16 , the light distribution La extracted by the light extraction structure 20 and the light distribution La extracted from the outer peripheral side of the light guide body 16 and leaked by the inner peripheral surface of the outer cylinder member 14 are generated. Reflected or diffused light distribution Lb. In addition, as described above, the light distribution Lc that passes through the inside of the light guide body 16 in the axial direction and is emitted from the lower end surface in the axial direction is also generated. By combining these light distributions La, Lb, and Lc, a combined light distribution Lg, which is the illumination light of the illuminator 10 , is generated, and is irradiated below the illuminator 10 .

FIG. 5 is a diagram showing how the light distribution changes according to the diffusivity of the dots 22 . Here, the diffusivity of the dots 22 can be adjusted by the concentration of the pigment contained in the dots 22 . Specifically, when the pigment concentration is reduced to reduce the diffusivity, the light distributions La and Lb change as shown in FIG. 5( a ) from the state shown in FIG. 5( b ), and conversely, When the pigment concentration is increased to increase the diffusivity, the light distributions La and Lb are changed as shown in FIG. 5( c ) from the state shown in FIG. 5( b ). By adjusting the diffusivity in this way, the lighting fixture 10 having the desired light distributions La and Lb can be designed according to the purpose.

Next, a modification of the light extraction structure will be described with reference to FIGS. 6 and 7 . 6 is a partially enlarged perspective view of the light guide body 16 showing an example of the prisms 24a, 24b constituting the light extraction structures 20a, 20b. In the above description, the example in which the light extraction structure 20 provided on the outer peripheral surface 16a of the light guide body 16 is constituted by spot coating has been described, but the present invention is not limited to this. As shown in FIG. 6 , the light extraction structure 20 may be constituted by arranging concave grooves 24 a having the same cross-section continuous in the circumferential direction in the axial direction, or by forming a plurality of The light extraction structure 20b is constituted by fine prisms 24b formed of substantially conical concave portions. In this case, instead of the groove 24a, a convex portion having the same cross-section continuous in the circumferential direction may be used, or a substantially conical protruding portion may be used instead of the prism 24b composed of a substantially conical concave portion. Convex fine prism.

In addition, when the light extraction structures 20a and 20b are constituted by the grooves 24a or the prisms 24b, the coverage in the outer peripheral surface 16a of the light guide body 16 may be constant in the axial direction, or may be gradually increased from the upper end surface to the lower end surface. increase, which is the same as in the case of spot painting above.

7A and 7B are diagrams showing angles of prisms. Preferably, as shown in FIG. 7A , when the light guide body 16 is cut along a plane including the central axis A, the prisms 24 a and 24 b have a substantially triangular cross-sectional shape, and the prisms 24 a and 24 b preferably have a substantially triangular cross-sectional shape with respect to the outer peripheral surface along the light guide body 16 . The axial line of 16a has an angle θ of 10° to 40°. By setting such an angle range, the light extracted on the inner peripheral side of the light guide body 16 can be efficiently emitted from the lighting fixture 10 by the light extraction structures 20a and 20b including the prisms 24a and 24b. In addition, as shown in FIG. 7B , the hem portion and the vertex portion of the substantially triangular prisms 24a and 24b may be formed in an R shape.

8A to 8C are diagrams showing changes in the light distribution La depending on the angle θ of the prisms 24a and 24b , and FIG. 8D is a diagram showing how the light inside the cylindrical light guide is emitted toward the opposing wall surfaces. 8A shows the case where the prism angle θ is 30°, FIG. 8B shows the case where the prism angle θ is 42°, and FIG. 8C shows the case where the prism angle θ is 54°. In FIG. 8A , when the prism angles θ are large as 42° and 54° as compared with FIGS. 8B and 8C , the light distribution La on the inner peripheral side of the light guide body 16 is close to that parallel to the radial direction of the light guide body 16 . direction (equivalent to directly below in FIGS. 8A to 8C ). In this way, as shown in FIG. 8D , the light distribution La,b, which is the combined light of the light distributions La and Lb emitted from the inner peripheral surface 16b on one radial side of the light guide body 16, is incident on the inner periphery on the other radial side. It becomes difficult to irradiate from the lighting fixture 10 to the surface 16b, and the light-emitting efficiency as a lighting fixture falls. Therefore, in order to suppress such a decrease in light irradiation, the prism angle θ is preferably 40° or less. On the other hand, when the prism angle θ is less than 10°, the amount of light extracted by the prisms 24a and 24b decreases, and the amount of light for surface emission of the inner peripheral surface 16b of the light guide 16 is insufficient, which is not preferable.

As described above, the lighting fixture 10 of the present embodiment includes: the cylindrical light guide body 16 having the light extraction structure 20 on the outer peripheral surface 16 a; A light source group 19 composed of a plurality of light sources 18; a cylindrical outer cylinder member 14 arranged around the outer side of the light guide body 16; provided and arranged to cover one end portion in the axial direction of the light guide body 16 and the outer cylinder member 14 There is a base member 12 of a drive circuit 13 that drives the light source group 19 to emit light.

According to this configuration, compared to the case where the light source is provided at a position facing the inner space of the cylindrical light guide, the cylindrical light guide 16 can be made to emit light uniformly in the axial direction, and the output can be distributed. The shape of the light is designed according to the purpose. Thereby, it is possible to provide a novel downlight that has not been heretofore in which the inner peripheral surface 16b of the cylindrical light guide body 16 performs surface emission, thereby realizing enhancement of the product lineup and improvement of the product value.

In the lighting fixture 10 of the present embodiment, the inner peripheral surface of the outer cylinder member 14 is mirror-finished or light-diffusing. Thereby, the distribution light leaking from the outer peripheral surface 16a on which the light extraction structure 20 is provided can be guided to the inner peripheral side of the light guide 16, and the surface emission state of the inner peripheral surface 16b of the light guide 16 can be made brighter.

In addition, in the lighting fixture 10 of the present embodiment, the light extraction structures 20 , 20 a , and 20 b may be formed of a dot coating formed of a paint containing a diffusing pigment, or a concave or convex prism.

In this case, the dot coating or the prism may have a certain coverage, or may have a distribution that increases from the upper end face toward the lower end face in the axial direction of the light guide body 16 .

Further, in the lighting fixture 10 of the present embodiment, when the light guide body 16 is cut along a plane including the central axis A, the prisms 24 a and 24 b preferably have a substantially triangular cross-sectional shape, and the prisms 24 a and 24 b preferably have a substantially triangular cross-sectional shape with respect to the outer circumference along the light guide body 16 . The axial line of the face 16a has an angle θ of 10° to 40°.

In this case, the prisms 24a and 24b may be substantially conical, or may be grooves or protrusions in which the same cross section is continuous in the circumferential direction.

Further, in the lighting fixture 10 of the present embodiment, it is preferable that the lower end surface of the light guide body 16 in the axial direction is subjected to uneven processing for diffusing and transmitting the light traveling in the axial direction in the light guide body 16 , Embossed or diffused coating. As a result, the light emission state at the lower end surface of the annular light guide body 16 can be uniformized in the circumferential direction.

In addition, the lighting fixture of the present disclosure is not limited to the above-described embodiment and its modifications, and various changes and improvements can be made within the scope of the features described in the claims of the present application.

For example, the plurality of light sources 18 constituting the light source group 19 may be divided into a plurality of groups in the circumferential direction, and the lighting states may be individually controlled by the drive circuit 13 . By performing such control, the lighting fixture 10 provided with the cylindrical light guide body 16 can perform a novel illumination light expression which has never been seen before, and can improve the product value.

Claims (8)

1. A lighting device, comprising:

a cylindrical light guide having a light extraction structure on an outer peripheral surface;

a light source group including a plurality of light sources arranged in a ring shape along an upper end surface of the light guide body in an axial direction;

a cylindrical outer cylinder member disposed around an outer side of the light guide; and

and a base member that is provided so as to cover one end portion in the axial direction of the light guide and the outer cylinder member, and on which a drive circuit for driving the light source group to emit light is arranged.

2. The lighting apparatus of claim 1,

the inner peripheral surface of the outer tube member is mirror-finished or light-diffused.

3. The lighting apparatus of claim 1,

the light extraction structure is formed by dot coating formed by paint containing a diffusion pigment, or concave or convex prisms.

4. The lighting apparatus of claim 3,

the dot coating or the prism has a certain coverage, or has a distribution that increases from the upper end surface toward the lower end surface in the axial direction of the light guide.

5. The lighting apparatus of claim 3,

when the light guide is cut on a plane including the central axis, the cross-sectional shape of the prism is substantially triangular, and the prism has an angle of 10 DEG to 40 DEG with respect to an axial line along the outer peripheral surface of the light guide.

6. The lighting apparatus of claim 3,

the prism has a substantially conical shape, or a groove or a projection having the same cross section and being continuous in the circumferential direction.

7. The lighting apparatus of claim 1,

the lower end surface of the light guide body in the axial direction is subjected to embossing, texturing, or diffusion coating for diffusing and transmitting light that has advanced in the axial direction within the light guide body.

8. The lighting device according to any one of claims 1 to 7,

the plurality of light sources constituting the light source group are divided into a plurality of groups in the circumferential direction, and the lighting state can be controlled by the drive circuit.

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