JP6108900B2 - Reflector and lighting device - Google Patents

Description

  The present invention relates to a reflecting plate that is incorporated in a lighting device and reflects light emitted from a light source, and a lighting device including the reflecting plate.

  In recent years, lighting devices using light-emitting diodes (LEDs) as light sources are generally more energy efficient than fluorescent lamps and incandescent bulbs, and have a long lifetime, so that their applications are rapidly expanding. However, a point light source typified by an LED (in the description of the present application, it is a light source that is distinguished from a linear light source or a planar light source, and the area of the light emitting part (light-emitting part) in the light source is larger than the area occupied by the illumination device The light emitted from a small light source) has high directivity, and in that state, the light is locally radiated. Therefore, in order to improve the light distribution (also referred to as “orientation”) of the lighting device, that is, to irradiate a certain amount of light over a certain area, the light emitted from the light source with high directivity Needs to be diffused appropriately.

  As a method of diffusing light from the light source with high directivity, a recess (hereinafter referred to as a reflector recess) is formed in a flat plate material excellent in light reflectivity, and formed at the bottom of the reflector recess. It has been proposed that the light emitting portion of the light source protrudes into the concave portion of the reflecting plate from the opened opening, and the light emitted from the light source is reflected and diffused on the inner surface of the concave portion of the reflecting plate. As an example of an illumination device including such a reflector, a light source module including a plurality of LEDs arranged in a planar shape, a reflector formed to cover the light source module, and a reflector is formed to cover the reflector. There has been proposed a light box including a diffuser plate that diffuses and transmits light from a light source. In this illuminating device, a reflecting plate recess is formed at a position corresponding to the LED of the light source module, and the light emitted from the LED protruding into each reflecting plate recess and the light reflected by the reflecting plate are diffusers. Since the light passes through the diffusion plate while being diffused, it is possible to irradiate a certain amount of light from a planar region (Patent Document 1 below).

International Publication WO2007 / 037035

  The light source with high directivity has a small directivity angle, which is an angle representing the spread with respect to the optical axis of the light emitted from the light source. However, in the lighting device described in Patent Document 1, it is difficult to say that the reflector incorporated in the lighting device is appropriately formed according to the directivity angle of the LED. For this reason, in this illuminating device, illuminance unevenness may occur. That is, there was a possibility that irradiation with intense light locally as described above could not be sufficiently suppressed.

  Then, this invention makes it a subject to provide the reflecting plate which can suppress effectively the illumination intensity nonuniformity of the illuminating device which is a mounting object, and an illuminating device provided with this reflecting plate.

The present invention is a reflecting plate that is incorporated in a lighting device and reflects light emitted from a light source, and includes a reflecting plate recess in which at least a part of the light source is located, and the reflecting plate recess emits light of the light source. A bottom part where the light source light emitting part is located, and a peripheral side wall part that has an inner reflection surface that is inclined outwardly from the outer edge part of the bottom part and reflects the light of the light source light emitting part , It has a longitudinal cross-sectional shape that connects the front end of the inner reflection surface and the outer edge of the bottom with an arc, and the distance between the outer edges facing each other across the light source light emitting part at the bottom is L1, The distance between the front ends of the inner reflection surface facing each other across the light source emitting part is L2, the distance in the front-rear direction from the rear end to the front end of the inner reflection surface is H, the radius of the arc is R, A straight line connecting the front end of the inner reflective surface and the outer edge of the bottom If it is to the angle formed with the normal line of the bottom beta, and satisfies the following formula.
2.4 ≦ L2 / H ≦ 5.5
1.0 ≦ (L2-L1) /H≦2.2
R = [{(L2-L1) / 2} ² + H ² ] ^0.5 / {2 × sin (7.5 ° + | 37.5 ° −β |)}

According to this configuration, the inner reflection surface in the reflecting plate concave portion that is shaped to satisfy the above formula reflects the light of the light source, and guides the reflected light in an appropriate direction without the light flux being too blocked. be able to. For this reason, the reflecting plate recess can be appropriately formed according to the directivity angle of the light source, and even with a light source having high directivity, uniform irradiation can be performed while increasing the irradiation efficiency to the front of the illumination device.

Furthermore , according to this configuration, the inner reflection surface of the peripheral side wall portion having a vertical cross-sectional shape having an arc satisfying the above equation reflects the light of the light source according to the surface corresponding to the arc, and this light is It is possible to guide efficiently in an appropriate direction. For this reason, the irradiation efficiency to the front of an illuminating device can further be improved.

  Further, at least a part of the outer edge portion of the reflecting plate is provided with an outer edge surface portion, the outer edge surface portion has an outer edge surface portion reflecting surface that inclines toward the outside, and the outer edge surface portion reflecting surface is the light source. The light that has been emitted from the light emitting unit and then reflected in the lighting device can be reflected to guide the light to the side of the lighting device.

  According to this structure, the said outer edge surface part reflective surface can guide to the side of the said illuminating device by reflecting the light reflected in the said illuminating device after being emitted from the said light source light emission part. For this reason, the irradiation efficiency to the side of an illuminating device can be improved.

  A plurality of reflection plate recesses, and further including a connection portion between the plurality of reflection plate recesses in addition to the outer edge surface portion, the connection portion being rearward as it goes outward from the center of the reflection plate in plan view. The connecting portion reflecting surface is inclined to the side, and the connecting portion reflecting surface reflects the light emitted from the light source light emitting portion and then reflected in the lighting device, to the side of the lighting device. It can also lead to.

  According to this structure, the said connection part reflective surface guides to the side of the said illuminating device by reflecting the light reflected in the said illuminating device after being emitted from the said light source light emission part. For this reason, the irradiation efficiency to the side of an illuminating device can further be improved by the combination of the said outer edge surface part and a connection part.

  In addition, the plurality of concave portions of the reflection plate may be disposed so as to spread in a plane direction, and one curved surface may be configured by the outer edge surface reflection surface and the connection portion reflection surface. According to this configuration, a single curved surface formed by the outer edge surface reflection surface and the connection portion reflection surface can balance light reflection to the front of the lighting device and light reflection to the side. . Note that the phrase “spread in the plane direction” also allows a positional shift in the front-rear direction.

  In addition, the present invention is characterized in that any one of the reflecting plates is combined with at least one point light source in which the light source light emitting portion is located in the concave portion of the reflecting plate. According to this configuration, the light from the point light source with high directivity is reflected by the reflecting plate having any one of the shapes, and the reflected light is guided in an appropriate direction without the light beam being too blocked. Can do. For this reason, the reflector depression can be appropriately formed according to the directivity angle of the light source, and even when a point light source is used, uniform irradiation is possible while increasing the irradiation efficiency to the front of the illumination device.

  Moreover, it can be further provided with a cover that is located in front of the point light source and allows the light from the light source light emitting part to pass through while diffusing. According to this structure, it can suppress that a light nonuniformity and a shadow nonuniformity arise in an illuminating device with a cover.

  As described above, according to the present invention, the reflector concave portion can be appropriately formed according to the directivity angle of the light source, and even with a highly directional light source, the irradiation efficiency to the front of the illumination device is increased while being uniform. Irradiation is possible. For this reason, the illuminance nonuniformity of the illuminating device which is the object for incorporating the reflector can be effectively suppressed.

The perspective view of the decomposition | disassembly state which showed the structural article of the illumination lamp in which the reflecting plate which concerns on 1st Embodiment was integrated. The perspective view which showed the light source container of the illumination lamp incorporating the reflecting plate which concerns on 1st Embodiment. (A) is the perspective view which showed the cross section orthogonal to the longitudinal direction of the reflecting plate of the illumination lamp incorporating the reflecting plate which concerns on 1st Embodiment, (b) showed the longitudinal cross section of the reflecting plate. (C) is explanatory drawing which showed the dimensional relationship of the reflecting plate recessed part. Explanatory drawing about the measuring method of the radiation angle and directivity angle of a light source. Sectional drawing which showed the cross section orthogonal to each longitudinal direction in the state with which the light source container, the reflecting plate, and the diffusion plate of the illumination lamp with which the reflecting plate which concerns on 1st Embodiment was integrated were piled up. (A)-(f) is the perspective view which showed the reflecting plate which concerns on other embodiment by which the several light source was arranged in linear form. (A) is the perspective view which showed the reflecting plate which concerns on 2nd Embodiment, and displayed the center in the longitudinal cross section, (b) The perspective view which showed the reflecting plate which concerns on 4th Embodiment, and displayed the cross section in the center. Figure. (A) is the longitudinal cross-sectional view which showed the illuminating device with which the reflecting plate which concerns on 2nd Embodiment was integrated, (b) was the longitudinal cross-section which showed the illuminating device with which the reflecting plate concerning 4th Embodiment was integrated. Figure. (A) is the longitudinal cross-sectional view which showed the reflecting plate which concerns on 3rd Embodiment, (b) is the longitudinal cross-sectional view which showed the deformation | transformation form of the reflecting plate concerning 3rd Embodiment, (c) is 4th. The longitudinal cross-sectional view which showed the reflecting plate which concerns on embodiment. (A) is explanatory drawing which showed each part dimension of the reflector recessed part, (b) is explanatory drawing which showed each part dimension of the illuminating device, (c) is description which shows the measuring method of front illumination intensity and side illumination intensity Figure. The figure which shows the planar view shape and vertical end surface view shape of an Example, a comparative example, and a reference example.

  Hereinafter, a plurality of embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the vertical and horizontal / vertical directions are expressed when the cover 1 is located above in the vertical direction and the light source container 2 is located below as shown in FIG. The standard. The expressions before and after are based on the direction of a light emitting diode (LED) located in the illumination lamp (more specifically, the direction of a light beam emitted from the LED).

  First, the first embodiment will be described. The illuminating lamp that constitutes a part of the illuminating device in which the reflector of the present embodiment is incorporated is mainly intended to replace the conventional straight tube fluorescent lamp in which the light emitting portion is a straight tube. Is an illumination lamp having a straight tube appearance. As shown in FIG. 1, a cover 1 that diffuses and transmits light, a light source container 2 that houses an LED that is a light source L, and a reflector 3 that reflects light from the light source L. , And a pair of caps 5 and 5 inserted into a socket for supplying a current. Then, the light source container 2 is attached along the axis of the cover 1 to form a straight tube. The reflecting plate 3 and the diffusion plate 4 are disposed in the internal space of the straight tube portion. A lighting device is formed by attaching a pair of caps 5 and 5 to both ends of the light source container 2).

  The cover 1 is detachable from the light source container 2 and is formed so that the axial direction is long. In the present embodiment, the cover 1 has a cylindrical outer peripheral portion that is cut out along the longitudinal direction by forming the side opening 1b along the axial direction (specifically, across the entire region between both ends in the longitudinal direction). The cross-sectional shape of the cross section orthogonal to the longitudinal direction is formed in a substantially “C” shape. Further, the cover 1 has end openings 1a and 1a formed at both ends. The side opening 1b is formed in parallel with the longitudinal direction, and the width dimension is set such that the light source container 2 can be attached to the side opening 1b. For this reason, the cover 1 receives an external force applied downward to the cover 1 and is elastically deformable so that the side openings 1b expand in the width direction. Further, the opening edge 1c of the side opening 1b is indirectly attached to the upper side surface 2b1 of the container flange 2b in the light source container 2 (this embodiment) when the cover 1 is attached to the light source container 2. Then, it functions as an abutting portion that abuts (through the reflecting plate 3 and the diffusion plate 4).

  Moreover, the cover 1 is provided with the latching protrusion 1d as a latching part which protrudes from an internal peripheral surface. The locking projection 1d is formed parallel to the longitudinal direction. Specifically, the locking projection 1d is formed with one end-side locking projection 1d1 on the side close to the side opening 1b, and further, one locking projection 1d at a position away from the side opening 1b in the circumferential direction. A back side locking projection 1d2 is formed one by one. That is, two are formed on one side in the width direction of the side opening 1b. The distance between the position on the back side of the base end portion of the end side locking projection 1d1 and the position on the end side (side opening side) of the base end portion of the back side locking projection 1d2 is the diffusion plate flange portion 4b, The thickness substantially coincides with the thickness of the reflecting plate flange portion 3c and the container flange portion 2b.

  The locking projection 1d is formed linearly over the entire area between the end openings 1a, 1a formed at both ends of the cover 1. In the present embodiment, a pair of locking projections 1d are formed such that each set of two sets sandwiches the side opening 1b. The cross-sectional shape of the locking projection 1d is a triangle. Specifically, the container of the light source container 2 in a state where the side surface shape of the locking projection 1d near the side opening 1b is attached to the light source container 2 (or assembled as an illumination lamp). It is a shape parallel to the upper side surface 2b1 of the flange portion 2b, and the opposite side surface is a horizontal surface in the same state. By adopting such a shape, it is possible to prevent light from being blocked by the locking projection 1d on the upper surface 2b1 side of the housing flange portion 2b after the cover 1 is mounted on the light source housing 2. In the present embodiment, the end-side locking projection 1d1 is formed so as to coincide with the opening edge 1c of the side opening 1b, but the end-side locking is located at a position away from the opening edge 1c in the circumferential direction. The protrusion 1d1 may be formed. One locking protrusion 1d may be formed on one side in the width direction of the side opening 1b.

  The material for forming the cover 1 is not particularly limited as long as it has light diffusibility, that is, can diffuse and transmit light from the light source L. For example, resins having different refractive indexes are used. It may be a mixture or an incompatible fine particle added to the material or coated on the surface. In particular, in this embodiment, since the cover 1 is attached to the light source container 2, the cover 1 is deformed when the side opening 1b is enlarged or reduced. For this reason, it is preferable to set it as the material excellent in intensity | strength, As a preferable material, polymethyl acrylate type and a polycarbonate-type resin raw material are mentioned, for example. Further, for example, the surface of the cover 1 may be provided with light diffusibility by being provided with concave stripes and convex stripes, or fine processing.

  The cover 1 configured as described above is mounted from the outside in the width direction of the light source container 2. For this reason, the translucent cover can be positioned in a wide range in the circumferential direction in the light emitting portion having a straight tube shape. Therefore, the light distribution of the illumination lamp can be improved. The “light emitting portion” in the present embodiment is a portion corresponding to the light emitting portion in a conventional straight tube type fluorescent lamp, and refers to a portion excluding a base and a base connected to the base.

  The light source container 2 is formed to be elongated along one direction. The length of the light source container 2 is not particularly limited, but in the present embodiment, the length of the cover 1 is almost the same as the length of the cover 1 in the longitudinal direction. The light source container 2 is configured to house a light source module Lm including an LED as the light source L. Specifically, the light source container 2 is formed in a concave shape (more specifically, a cross-sectional shape orthogonal to the longitudinal direction is concave), and is configured to accommodate the light source module Lm inside. In addition, the light source module Lm of this embodiment is formed so that it may become long along the longitudinal direction of the light source container 2, and the several light source L is linearly formed (in one direction) along a longitudinal direction on a board | substrate. It is a board mounting type arranged at equal intervals. In the present embodiment, as shown in FIG. 1, the light sources L are arranged in a line, but the present invention is not limited to this, and the light sources L are arranged in a plurality of lines or in a staggered pattern. Or you may. Furthermore, as in the second embodiment (see FIG. 7A) or the fourth embodiment (see FIG. 7B), when the plurality of light sources L. It may be arranged to spread. Conversely, the light source module Lm may be composed of only one light source L (see FIG. 11). Further, the light source module Lm can be conveniently selected such as a wiring module type in addition to the substrate mounting type.

  The light source container 2 will be described in more detail. As shown in FIG. 2, the light source container 2 is formed in a concave shape to accommodate a light source module Lm, and a widthwise end of the container concave part 2a. And a container flange portion 2b extending outward from the portion. Here, the outside is a direction orthogonal to the axial direction in a state where the cover 1 is mounted on the light source container 2 (that is, a direction orthogonal to the longitudinal direction of the cover 1 and the light source container 2), It refers to the direction from the inside to the outside of the housing recess 2a.

  The container recess 2a includes a container bottom 2c on which the light source module Lm is placed, and a pair of container walls 2d and 2d formed from the end of the container bottom 2c toward the opening direction. Has been.

  The container bottom portion 2 c is formed in a plane whose upper surface is elongated along the longitudinal direction of the light source container 2. The container bottom 2c is configured to be in close contact with the light source module Lm. The container wall 2d is formed along the longitudinal direction of the light source container 2 (that is, the container bottom 2c) (specifically, over the entire area between both ends in the longitudinal direction). The lower part of the container wall 2d is formed so as to be substantially orthogonal to the container bottom 2c. On the other hand, an intermediate portion of the container wall 2d is formed so as to be inclined outward from the container bottom 2c. And the upper part of the container body wall part 2d is formed so as to be directed upward.

  A plurality of fins 2e protrude from the lower surface of the container bottom 2c and the outer surface of the container wall 2d. The fin portion 2e on the container bottom 2c side is a flat plate formed orthogonal to the lower surface of the container bottom 2c and along the longitudinal direction. The fin portion 2e on the container wall 2d side has a cross-sectional shape in which the inner surface is a vertical surface and the outer surface is an inclined surface as shown in FIG. 2, and is formed along the longitudinal direction. And the surface above the outer side in the fin part 2e by the side of the container body 2d comprises a part of fitting part 2f.

  The container flange portion 2b is formed so as to extend downward and obliquely outward from the end of the container wall portion 2d located in the opening direction of the container recess 2a. The container flange portion 2b is formed along the longitudinal direction of the light source container 2 (specifically, over the entire area between both ends in the longitudinal direction). The upper side surface 2b1 of the container flange portion 2b is a flat inclined surface that faces outward in the width direction. In the present embodiment, the inclination angle of the upper side surface 2b1 is 45 °.

  A groove-like fitting portion 2f along the longitudinal direction is formed by the inner lower surface of the flange portion 2b, the outer upper surface of the fin portion 2e on the container body wall portion 2d side, and the upper portion of the container wall portion 2d. The fitting portion 2f functions as a locked portion with respect to the locking protrusion 1d as the locking portion. An end side locking projection 1d1 of the cover 1 is fitted to the fitting portion 2f.

  In addition, it does not specifically limit as a material which forms the light source container 2, In this embodiment, the aluminum alloy is formed by extrusion molding. However, it is not limited to an aluminum alloy, and various materials can be used. In particular, considering heat dissipation, it is preferable to use a material having high thermal conductivity (metal or the like). By forming the light source container 2 using such a material, the heat of the light source module Lm can be dissipated to the outside of the light source container 2, and the temperature rise of the light source module Lm is suppressed. Can do. In particular, an aluminum alloy is preferable because it is excellent in thermal conductivity, can be lightweight, has good workability, and has excellent surface light reflectivity. Furthermore, since the fin part 2e is formed in the light source container 2 of this embodiment, the heat of the light source module Lm can be effectively dissipated from the fin part 2e. In the present invention, the formation of the fin portion 2e is not essential and may be omitted. Moreover, it is shapes other than a fin, Comprising: You may be comprised so that heat dissipation may be accelerated | stimulated by having increased the surface area of the light source container 2. FIG.

  Returning to FIG. 1, the reflecting plate 3 is formed to be long in one direction. The length of the reflector 3 is not particularly limited and can be various lengths. Moreover, the reflecting plate 3 has a concave shape (specifically, a cross-sectional shape orthogonal to the longitudinal direction is concave). Moreover, the reflecting plate 3 includes a plurality of concave regions (reflecting plate recesses 3a described later). A plurality of the concave regions are formed along the longitudinal direction of the reflecting plate 3. And the reflecting plate 3 is provided with the partition wall part 3b which partitions off the space formed inside the area | region used as each concave shape between the areas used as each concave shape. The reflection plate 3 is stacked above the light source container 2 so that light from the light source L is reflected on the surface of the reflection plate 3 (particularly, the reflection inner wall surface 3f of the reflection wall portion 3e and the wall surface 3j of the partition wall portion 3b). Can be reflected to reach the cover 1. Thereby, the illumination intensity of an illumination lamp can be improved. In addition, the unevenness of light due to the plurality of light sources L can be reduced, and the light distribution can be made uniform (this is an effect that is particularly prominent when a reflecting plate having high diffuse reflectivity is used).

  The reflecting plate 3 will be described in more detail. As shown in FIG. 3A, the reflecting plate 3 is housed in the cover 1 in which the light source housing 2 is combined (the light source housing 2 and the cover 1). In a state where the reflecting plate 3 is located in the space formed by the locking of the reflecting plate, the reflection is formed so that the cross-sectional shape orthogonal to the axis of the cover 1 (in other words, the longitudinal direction of the reflecting plate 3) is concave. A plate recess 3a and a reflector flange portion (outer edge surface portion) 3c extending outward from an end located in the opening direction of the reflector recess 3a are provided. In the present embodiment, a plurality of reflecting plate recesses 3a are formed along the axis of the cover 1 (in other words, the longitudinal direction of the reflecting plate 3). And the partition wall part 3b which partitions off the space formed inside each reflecting plate recessed part 3a is formed between each reflecting plate recessed part 3a. Here, “outward” refers to a direction perpendicular to the axis of the cover 1 in a state in which the reflector 3 is accommodated in the cover 1 and from the inside to the outside of the reflector recess 3 a.

  The reflection plate recess 3a is formed in the same shape as a reflection bottom portion 3d, which is a bottom portion formed in a flat plate shape (specifically, a square shape in plan view), and is open from the end portion of the reflection bottom portion 3d in the opening direction. It is comprised from a pair of opposing reflecting wall part (circumferential side wall part) 3e, 3e formed toward the front. The reflecting plate recess 3a includes a reflecting inner wall surface (inner reflecting surface) 3f formed so as to be inclined outwardly from the outer edge portion of the reflecting bottom portion 3d toward the opening direction.

  The reflective bottom 3d includes an opening 3g formed so as to penetrate in the thickness direction. The opening 3g is configured such that the light source L can be inserted from the lower outer side of the reflecting plate recess 3a, and the reflecting plate 3 is placed on the light source container 2 as shown in FIG. A part of the light source L protrudes upward (specifically, a part including a light emitting part which is a part of the LED that emits light). Thereby, the light of the light source L is irradiated from the reflection bottom 3d. The reflection inner wall surface 3f is formed so that the opposing surfaces of the pair of reflection wall portions 3e and 3e facing each other are inclined outward from the reflection bottom portion 3d in the opening direction. That is, the reflecting plate recess 3a includes a pair of opposing reflecting inner wall surfaces 3f and 3f.

  The reflection plate flange portion 3c is formed to extend obliquely downward and outward from an end portion of the reflection wall portion 3e located in the opening direction of the reflection plate recess 3a. That is, the upper side surface (outer reflection surface) of the reflector plate flange portion 3c is a surface inclined at a different angle from the reflection inner wall surface (inner reflection surface) 3f of the reflection wall portion 3e. Moreover, the reflecting plate flange portion 3c is formed along the longitudinal direction of the reflecting plate 3 (specifically, over the entire area between both ends in the longitudinal direction). Further, as shown in FIG. 5, the reflecting plate flange portion 3 c has an upper side surface and a lower side surface of the container flange portion 3 b in the light source container 2 with the reflecting plate 3 superimposed on the light source container 2. It is formed to be parallel to the upper side surface 2b1. Since the left and right reflector flange portions 3c, 3c are sandwiched between the light source container 2 and the cover 1, the reflector 3 can be fixed to the light source container 2 without displacement without using an adhesive or an adhesive tape. .

  The partition wall 3b is formed so as to be substantially orthogonal to the axis of the cover 1 (in other words, the longitudinal direction of the reflector 3). A plurality of partition wall portions 3 b are arranged at regular intervals along the longitudinal direction of the reflecting plate 3 (at equal intervals). And as shown in FIG.3 (b), a pair of opposing partition wall part 3b, 3b is formed so that the space | interval of opposing wall surface 3j, 3j may become wide toward the open direction of the reflecting plate recessed part 3a. ing. The wall surfaces 3j and 3j are formed in a flat plate shape like the reflection wall portions 3e and 3e. As a result, the space defined by the pair of opposing partition walls 3b, 3b and the reflecting plate recess 3a has a reverse truncated polygonal pyramid shape or a polygonal frustum shape (specifically, a quadrangular frustum shape). ing. In the present embodiment, the partition wall 3b has the end 3k positioned on the opening direction side of the reflecting plate recess 3a positioned on the reflecting bottom 3d side of the opening 3m in the opening direction of the reflecting plate recess 3a. . By forming the partition wall 3b, a plurality of the inverted truncated polygonal pyramid-shaped or polygonal frustum-shaped (quadratic frustum-shaped) spaces are juxtaposed in the longitudinal direction of the reflecting plate 3.

  As described above, since the reflecting plate 3 is accommodated in the cover 1 combined with the light source container 2, a lamp using a conventional fluorescent lamp is provided on the side of the lamp to which the illumination lamp of this embodiment is attached. Thus, since it is not necessary to provide a reflector for reflecting the light of the illumination lamp (mainly, the light irradiated in the direction opposite to the irradiation direction) outside the illumination lamp, the configuration of the lamp can be simplified.

  Further, since the reflecting plate 3 includes the plurality of partition wall portions 3b, more light is reflected by the inner surface of the reflecting plate recess 3a and the opposing wall surfaces of the pair of partition wall portions 3b. For this reason, brighter light can be irradiated toward the opening direction of the reflector recessed part 3a. Thereby, it becomes an illumination lamp which irradiates brighter light uniformly.

  Moreover, the rigidity of the direction orthogonal to the direction along the axis line of the cover 1 in the reflecting plate 3 can be improved by providing the some partition wall part 3b. Thereby, workability | operativity at the time of the assembly of an illumination lamp can be improved.

  Further, the end portion 3k of the partition wall portion 3b is positioned closer to the reflection bottom portion 3d than the end portion 3m of the reflection plate recess 3a, so that the rigidity of the reflection plate 3 in the direction along the axis of the cover 1 is improved. be able to. Thereby, workability | operativity at the time of the assembly of an illumination lamp can be improved.

  Further, the end 3k of the partition wall 3b has a function of converging the light toward the opening direction of the reflector recess 3a, so that the reflector 3 covers the cover 1 in a state combined with the light source container 2. When it is close to 1, it becomes difficult for light to reach between the end 3 k of the partition wall 3 b and the cover 1. For this reason, the light quantity of the area | region corresponding to the edge part 3k of the partition wall part 3b in the cover 1 falls, and a nonuniformity will arise in a light quantity. On the other hand, since the end 3k of the partition wall 3b is positioned on the reflection bottom 3d side, the interval between the end 3k of the partition 3b and the cover 1 is widened. Light can easily reach between the end 3k and the cover 1. Thereby, it becomes an illumination lamp which irradiates brighter light uniformly.

  In addition, it does not specifically limit as a material which forms the reflecting plate 3, In this embodiment, the reflecting plate 3 is formed by thermoforming a plate-shaped material. The plate-like material is not particularly limited, but for example, it is preferable to use a thermoplastic resin sheet. By forming the reflecting plate 3 by thermoforming the thermoplastic resin sheet, the reflecting plate 3 can be easily manufactured. Moreover, it is easier to produce a complicated shape than when the thermoplastic resin sheet is bent, and it is possible to prevent a decrease in reflectivity due to the crease formed by the bending process.

Here, as shown in FIG. 3C, the dimensions (longitudinal dimension or longitudinal dimension) of the reflecting plate recess 3a are the dimensions (inner dimensions) of the reflecting bottom 3d, that is, on the upper surface of the reflecting bottom 3d. The distance between the outer edges facing each other across the light source L is L1, and the dimension (inner dimension) between the upper ends of the partition walls 3b and 3b or the reflection walls 3e and 3e, that is, the partition walls 3b and 3b or the reflection interior The distance between the upper ends facing each other across the light source L between the wall surfaces 3f and 3f (that is, the opening end dimension of the reflector recess 3a) is L2 (the dimensions of the partition wall sections 3b and 3b are shown), and the partition wall section 3b, When the height dimension from the lower end to the upper end of 3b or the reflecting wall portions 3e, 3e (that is, the height dimension of the reflecting plate recess 3a) is H (illustrated is the height of the partition wall portions 3b, 3b), It is preferable to satisfy Formula 1 and Formula 2 in order to improve light distribution.

2.4 ≦ L2 / H ≦ 5.5 (Formula 1)
1.0 ≦ (L2−L1) /H≦2.2 (Formula 2)

  According to the reflector concave portion 3a whose dimensions are specified by Equation 1 and Equation 2, primary reflection (direct reflection of light emitted from the light source L) particularly on the reflection inner wall surface 3f in the reflection wall portion 3e and the wall surface 3j in the partition wall portion 3b. ) Can be efficiently focused forward. For this reason, by reflecting the light of the light source L, this light can be guide | induced forward, the loss light irradiated back from the light source L can be reduced, and the illumination intensity to the front can be improved. Moreover, the light reflected by the inner wall surface 3f of the reflection and the wall surface 3j of the partition wall portion 3b can be guided in an appropriate direction without the light flux being too blocked. For this reason, the reflecting plate recess 3a can be appropriately formed according to the directivity angle of the light source L, and even if a highly directional LED is used as the light source L, the illumination efficiency to the front of the illumination lamp is increased and uniform. Irradiation is possible.

  As described above, the optimum L2 can be determined by determining L1 and H according to the specifications of the illumination lamp, and thus the reflector 3 having a good light distribution can be designed.

Next, as the preferred shape of the reflector recess 3a is described, a method for measuring the radiation angle (angle corresponding to the spread of all the light emitted from the light source L) θ and the directivity angle θ _1/2 will be described. To do. The radiation angle θ is measured as follows. As shown in FIG. 4, an LED is prepared as the light source L to be measured. A luminance meter K is disposed at a position 50 cm away from the vertex Ls on the LED on a vertical straight line passing through the vertex Ls on the LED. As the luminance meter K, for example, a spot luminance meter commercially available under the trade name “CS-1000” from Konica Minolta, Inc., a spot luminance meter commercially available under the trade name “BM-7” from Topcon Techno House, Inc. A spectral radiance meter commercially available from Topcon Techno House under the trade name “SR-3AR” can be used.

  After turning on the LED, the luminance meter K is moved on a circle with a radius of 50 cm centered on the vertex Ls in the longitudinal section passing through the vertex Ls on the LED, and the luminance meter K is scanned every 1 ° interval. The brightness of light emitted from the LED is measured. Note that the measurement conditions of luminance by the luminance meter K are a measurement angle of 1 °, an ND filter of 10%, and an average number of times of 3 times / point.

  In FIG. 4, the point E1 at which the light from the LED is no longer measured is specified on the right side of the vertex Ls on the LED, and the point E2 at which the light from the LED is no longer measured on the left side of the vertex Ls on the LED To do. An angle ½ of an angle (2θ) formed by a line F1 connecting the vertex Ls on the LED and the point E1 and a line F2 connecting the vertex Ls on the LED and the point E2 is defined as θ.

Similarly, among the points where 50% of the maximum luminance is measured on the right or left side from the point where the maximum luminance is measured in FIG. 4, the right point in the drawing is specified as E3, and the left point in the drawing is specified as E4. Then, 1 / of an angle (2θ _1/2 , also referred to as “half-value angle”) formed by a line F3 connecting the vertex Ls on the LED and the point E3 and a line F4 connecting the vertex Ls on the LED and the point E4. The angle of ₂ is defined as the directivity angle θ _1/2 . Here, the maximum luminance is not limited to a strictly maximum (maximum) luminance. For example, in the case of a light source having a plurality of maximum peak characteristics, the rightmost and leftmost peaks thereof are determined. It can be used as a reference for the maximum brightness. In general, the specification display of the LED in circulation is made at the half-value angle 2θ _1/2 .

Next, preferable conditions relating to the shape of the reflecting plate recess 3a will be described. An angle (2α ′, FIG. 10) formed between the portion of the light source L that emits light (light source light emitting portion) formed on the reflection bottom portion 3d of the reflection plate recess 3a of the reflection plate 3 and the opening edge both edges of the reflection plate recess 3a. (B)) is an opening angle α ′, α ′ is intended to demarcate a peripheral side wall surface for reflecting a light beam emitted from the light source L in an angle range of θ _1/2 or more. ,
θ _1/2 ± 10 ° ≦ α '<θ
It is preferable that When α ′> θ, the light beam emitted from the light source L cannot be directly reflected, and it is difficult to substantially exhibit the function of directing the light beam emitted from the light source L directly forward. Further, when α ′ is sufficiently smaller than θ _1/2 (that is, θ _1/2 −10 °> α ′), the light beam emitted from the light source is blocked too much forward, so that the forward orientation is improved. The difference from the area other than the front becomes significant, and light unevenness is likely to occur. The formula is more preferably
θ _1/2 ± 5 ° ≦ α '<θ
It is.

On the other hand, when the opening angle α (see FIG. 10A) of the reflecting plate recess 3a is expressed using the opening end dimension L2 of the reflecting plate recess 3a and the height dimension H of the reflecting plate recess 3a, the following Expression 3 is obtained. .

tanα = L2 / (2 · H) (Formula 3)

  Here, the height dimension H can be approximated to a height H1 (see FIG. 10B) from the light source light emitting portion to the opening of the reflector concave portion 3a (that is, the height from the reflection bottom portion 3d of the light source light emitting portion). However, if it is negligible because it is sufficiently small with respect to the height dimension H), it may be considered that α = α ′. However, if it is more accurate or cannot be ignored, it can be considered by replacing H with H1. In this embodiment, the height of the light source is assumed to be sufficiently smaller than the height H of the reflector 3 and α = α ′ is applied.

When α = α ′ is applied, Equation 3 is expressed as Equation 4 below.

tan (θ _1/2 ± 10 °) = L2 / (2 · H) (Formula 4)

The directivity angle θ _1/2 of the light source can be conveniently selected according to the type of the light source L. In this embodiment, θ _1/2 = 60 °, and this value is common for LEDs. θ _1/2 = 60 ° is preferable because the directivity is not too strong (the directivity angle is not too narrow). The light source L may be used in combination with a lens or the like for adjusting directivity by condensing or diffusing in advance.

When the directivity angle range is ± 10 °, the directivity angle θ _1/2 = 60 ° of the light source L used in the present embodiment is substituted into Equation 4.
tan (60 ° ± 10 °) = L2 / (2 · H)
From this, the range of L2 / H is 2.4 ≦ L2 / H ≦ 5.5 of the above-mentioned formula 1.

When L2 / H <2.4 (α <50 °), α << θ1 _{/ 2} , and the ratio of the light beam from the light source L that is primarily reflected on the peripheral side wall surface of the reflector 3 is too high. While the front illuminance is further increased, the light source is excessively condensed and the difference between light and dark becomes clear and light unevenness is likely to occur. On the contrary, when 5.5 <L2 / H (70 ° <α), θ _1/2 << α, and the ratio of the primary reflection of the light source light beam on the peripheral side wall surface of the reflector 3 is too low. It becomes difficult to improve forward illuminance. In addition, when it is more preferable (when the range of the directivity angle is ± 5 °),
tan (60 ° ± 5 °) = L2 / (2 · H)
In this case, 2.9 ≦ L2 / H ≦ 4.3.

In order to increase the front illuminance efficiently, it is preferable that the inner surface (partition wall portions 3b, 3b or reflection inner wall surfaces 3f, 3f) of the reflecting plate recess 3a has a predetermined angle range. As a result of intensive studies, the line segment connecting the opening edge in the longitudinal section of the reflector recess 3a and the outer edge of the reflecting bottom 3d is the normal line of the reflecting bottom 3d. If the inclination angle β (see FIG. 10A),

tan β = (L2−L1) / (2 · H) (Formula 5)

By making β = 37.5 ° optimally in the range of ± 10 °, the light beam that is primarily reflected is efficiently reflected forward to increase the front illuminance and reduce light unevenness. I found out that I can. At this time, Equation 5 is
tan (37.5 ° ± 10 °) = (L2−L1) / (2 · H)
From this, the appropriate range of (L2−L1) / H is expressed by 1.0 ≦ (L2−L1) /H≦2.2 in the above formula 2. When the reflective bottom 3d does not have a flat surface, the normal line is determined from a virtual surface at the average position of the surfaces of the reflective bottom 3d.

  When (L2-L1) / H <1.0 (β <27.5 °), the ratio at which the light beam from the light source L is reflected off the front after being primarily reflected by the inner surface of the reflector recess 3a. Since it becomes high, it becomes difficult to improve front illumination intensity. Also, when 2.2 <(L2-L1) / H (47.5 ° <β), the ratio of reflection to other than the front is also high, and thus it is difficult to improve the front illuminance.

Note that Formula 5 is more preferably within a range of ± 5 °.
tan (37.5 ° ± 5 °) = (L2−L1) / (2 · H)
From this, the appropriate range of (L2-L1) / H is 1.3 ≦ (L2-L1) /H≦1.8.

The peripheral side wall surface of the reflecting plate recess 3a (in the first embodiment, the wall surfaces 3j and 3j or the reflecting inner wall surfaces 3f and 3f in the partition walls 3b and 3b) are formed between the opening edge and the reflecting bottom 3d in the longitudinal section of the reflecting plate recess 3a. It is not necessary to be a plane having a vertical cross-sectional shape that connects the outer edge with a straight line, and is a curved surface that is a vertical cross-sectional shape that connects the opening edge in the vertical cross section of the reflecting plate recess 3a and the outer edge of the reflecting bottom 3d with a curve. Also good. Here, when the curved surface is a curved surface having a longitudinal sectional shape connecting the opening edge in the longitudinal section of the reflecting plate recess 3a and the outer edge of the reflecting bottom 3d with an arc, the curved surface is the opening edge from the bottom side starting point. It has an ascending slope to the end point. That is, assuming a left inclined surface in the longitudinal sectional view of the reflector recess 3a, the angle formed by the tangent to the curve from the start point to the end point and the horizontal line of the reflection bottom 3d is in the range of 0 ° to 90 ° (in other words, The fourth quadrant of a circle centered on the origin on the Cartesian coordinates). More preferably, it is comprised in the range of 45 degrees-60 degrees, and it is preferable that this range is included. The curved surface that can be formed at this time is radiated to a 90 ° -α region that can be primarily reflected by the peripheral wall surface by applying an approximate value of the arc radius R (see FIG. 10A) obtained from the following equation. It is possible to increase the efficiency of reflecting the luminous flux in the front vertical direction, and therefore it is possible to efficiently increase the front illuminance even with a small luminous flux.

R = [{(L2−L1) / 2} ² + H ² ] ^0.5 / {2 × sin (7.5 ° + | 37.5 ° −β |)} (Expression 6)

Here, as a more preferable form, when β = 37.5 °,

R = [{(L2-L1) / 2} ² + H ² ] ^0.5 / ( ² × sin 7.5 °) (Expression 7)

(“|” Is an absolute value symbol).

  As described above, by simultaneously satisfying the conditions of the above formulas 1 and 2, it is possible to form the reflector recess 3a that efficiently increases the forward illuminance and reduces the light unevenness. The lighting device can be easily set by arbitrarily setting the dimensions L2, L1, and H for determining the dimensions of each part of the reflecting plate recess 3a in accordance with the relationship between the constituent members and the light source L. Can be designed.

  Next, returning to FIG. 1, the diffusion plate 4 is formed to be longitudinal along one direction. The length of the diffusion plate 4 is not particularly limited, and can be various lengths. The diffusion plate 4 has a convex shape (specifically, a cross-sectional shape perpendicular to the longitudinal direction is convex). The diffusion plate 4 is overlaid on the reflection plate 3.

  The diffusing plate 4 will be described in more detail. As shown in FIG. 5, the diffusing plate 4 is housed in the cover 1 in a state combined with the light source housing 2 and is elongated along the axial direction. A flat plate portion 4a and a diffusion plate flange portion 4b extending obliquely outward and downward from the widthwise end of the flat plate portion 4a are provided. Since the left and right diffusion plate flange portions 4b and 4b are sandwiched between the light source housing 2 and the cover 1, the diffusion plate 4 can be fixed without being displaced with respect to the light source housing 2 without using an adhesive or an adhesive tape. .

  Since the light from the light source L is reflected on the upper and lower surfaces of the diffuser plate 4 by the diffuser plate 4, the number of multiple reflections inside the cover 1 increases even if the light source L has a high directivity. Therefore, the light distribution can be made uniform with respect to the light emitted from the cover 1. Further, even when two or more different color light sources L are arranged in one light source module Lm, the color mixture of light is promoted and the color rendering property is excellent.

  As with the cover 1, the material for forming the diffusion plate 4 is not particularly limited as long as it can diffuse and transmit light from the light source L, and various materials can be used. The diffuser plate 4 of the present embodiment is formed by thermoforming a plate-like material like the reflector plate 3. The plate-like material is not particularly limited, but for example, it is preferable to use a thermoplastic resin sheet. When the diffusion plate 4 is formed by thermoforming the thermoplastic resin sheet, the diffusion plate 4 can be easily manufactured.

  Returning to FIG. 1, the base 5 includes a cylindrical base body 5 a with one end closed, and a pair of base pins 5 b and 5 b. The base body 5a is formed using a resin material (preferably having heat resistance). On the other hand, the pair of base pins 5b, 5b are made of, for example, a metal such as aluminum or copper, and are disposed so as to penetrate the base body 5a. One end portion is located outside the base body 5a, and the other end portion is formed. It is located inside the base body 5a. Then, with the illumination lamp formed, the other ends of the pair of cap pins 5b and 5b are electrically connected to the wiring pattern of the light source module Lm via lead wires.

  Next, a procedure for forming an illumination lamp using the cover 1, the light source container 2, the reflection plate 3, the diffusion plate 4, and the pair of caps 5 and 5 having the above-described configuration will be described. First, as shown in FIG. 5, the reflection plate 3 is overlaid on the light source container 2, and the diffusion plate 4 is overlaid thereon. Specifically, the light source container 2 and the reflector 3 are overlapped so as to accommodate the reflector recess 3a inside the container recess 2a, and the opening at the upper end of the reflector recess 3a is closed by the flat plate portion 4a. The diffusion plates 4 are stacked.

  At this time, the light source L protrudes into the reflector recess 3a from the opening 3g formed in the reflection bottom 3d. In this embodiment, it is demarcated by facing surfaces 3j, 3j of a pair of opposing partition walls 3b and inner surfaces of the reflecting plate recess 3a (a pair of reflecting inner wall surfaces 3f, 3f and one surface of the reflecting bottom 3d). At least one light source L protrudes into the space. Further, at both ends in the width direction, the container flange portion 2b, the reflection plate flange portion 3c, and the diffusion plate flange portion 4b are overlapped.

  Next, the cover 1 is attached to the light source container 2, the reflecting plate 3, and the diffusing plate 4 that are overlapped. In this case, first, when the cover 1 is brought into contact with the light source container 2 on which the reflecting plate 3 and the diffusing plate 4 are overlaid from above, the end side locking projection 1d1 of the cover 1 comes into contact with the diffusing plate flange portion 4b. (Indirect contact with the housing flange portion 2b of the light source housing 2). More specifically, the opening edge 1c of the side opening 1b in the cover 1 and the plane located at the edge of the end-side locking projection 1d1 that coincides with the opening edge 1c are on the upper surface of the diffusion plate flange 4b. Abut against.

  When a downward external force is applied to the cover 1 by an operator or the like to push the cover 1 in the above state, the cover 1 is elastically deformed, and the side opening 1b expands to open outward in the width direction (left and right direction). . At this time, the surfaces that have been in contact with each other as described above are shifted in a diagonally downward direction. When the side opening 1b further expands due to an external force, the end-side locking projection 1d1 of the cover 1 moves down over the diffusion plate flange 4b, the reflector flange 3c, and the housing flange 2b. After the overcoming, the elastic deformation is reduced and the side opening 1b is reduced by the elastic force of the cover 1 so as to close inward in the width direction. At this time, the opening edge 1c of the side opening 1b moves obliquely upward, and the end-side locking projection 1d1 enters the fitting portion 2f. Thereby, the end side latching protrusion 1d1 is fitted to the fitting portion 2f. At the same time, the rear side locking projection 1d2 of the cover 1 comes into contact with the diffusion plate flange portion 4b. For this reason, the diffusion plate flange portion 4b, the reflection plate flange portion 3c, and the housing flange portion 2b are sandwiched between the end side locking projection 1d1 and the back side locking projection 1d2. As described above, the cover 1 is attached.

  In the state after the cover 1 is attached, the cover 1 may remain with the elastic force generated when the side opening 1b expands, or the elastic deformation is released and the elastic force is released. May be in a free state where is 0.

  Next, the caps 5 and 5 are attached to both ends of the assembly (the light emitting portion in the present embodiment) in which the cover 1, the light source container 2, the reflection plate 3, and the diffusion plate 4 are combined as described above. As a result, an illumination lamp is formed which is long along the axial direction and has a light-emitting portion with a straight tubular appearance.

  As described above, according to the first embodiment, an illumination lamp using an LED as a light source can be easily manufactured in a small size.

  In the illumination lamp manufactured as described above, the light flux from the light source L is reflected in the reflection inner wall surface 3f, the wall surface 3j of the partition wall portion 3b, the diffusion plate flange portion 4b of the diffusion plate 4, and the cross section in the cover 1. Reflects on the arc-shaped inner surface. Then, the light is refracted and reflected by the flat plate portion 4 a of the diffusion plate 4. Regarding reflection, once reflected light may be reflected again at a different position (multiple reflection). In this way, the light from the light source L is guided to the cover 1 and is irradiated from the surface of the cover 1 to the outside. Therefore, by appropriately setting the reflection and refraction, it is possible to irradiate light reflected and refracted from other than the region corresponding to the light source L on the surface of the cover 1, and uniformize the light emitted from the cover 1. And the light distribution property and illumination intensity (brightness) of an illumination lamp can be improved.

  As described above, since the illumination lamp can be assembled by pushing the cover 1 downward against the light source container 2, a working space for assembly is inserted from, for example, a conventional opening at the end of the tube. Since it is not necessary to secure more than twice as much as the cover 1 as in the assembly method, the work space can be small. In addition, since the light-transmitting cover 1 can occupy most of the exposed portion of the illumination lamp as a light emitting portion, the light distribution can be improved. Moreover, since the reflecting plate 3 and the diffusing plate 4 can be incorporated into the light source container 2 at the same time, workability for assembling the illumination lamp is good.

  In the present embodiment, the length of the reflecting plate 3 and the diffusing plate 4 is shorter than the length of the cover 1, so that the plurality of reflecting plates 3 and the plurality of diffusing plates 4 are arranged in the longitudinal direction. Those arranged in a straight line can be combined with the cover 1 and the light source container 2. Thus, since the cover 1 can be attached by connecting the plurality of reflectors 3 and the plurality of diffusers 4, it is possible to improve workability when manufacturing the illumination lamp.

  Moreover, since the cover 1, the light source container 2, the reflecting plate 3, and the diffusion plate 4 are combined as described above, the reflecting plate 3 and the diffusion plate 4 are connected to the cover 1 and the light source housing 2. Thus, the illumination lamp can be rotated around the axis of the cover 1 to arbitrarily set the light irradiation direction.

  Moreover, it is not restricted to the assembly method which pushes the cover 1 downward like this embodiment, It assembles by sliding the light source container 2 from the edge part of the cover 1 along an axial direction (longitudinal direction of each part). Also good.

  Here, when the reflecting plate recess 3a is formed according to the number of the light sources L (however, the present invention is not limited to this, and a plurality of light sources L may be arranged in one reflecting plate recess 3a). One reflecting plate recess 3a may be formed per reflecting plate 3, or a plurality of reflecting plate recesses 3a ... 3a may be formed. Next, 2nd-4th embodiment in which the some reflecting plate recessed part 3a was formed is demonstrated.

  In the second to fourth embodiments, the reflecting plate 3 is incorporated in an illuminating device that is arranged so that the plurality of light sources L... L spread in a plan view (when viewed from above). As shown in FIG. 7A, the reflecting plate 3 of the second embodiment has a plurality of reflecting plate recesses 3a... 3a concentrically formed on a flat disc. Further, as shown in FIG. 9 (a), the reflector 3 of the third embodiment has a shape that inclines downward (rearward) as the outer edge of the flat disk goes radially outward. Although not shown, a plurality of reflecting plate recesses 3a... 3a are formed concentrically on the plate. As shown in FIGS. 7B and 9C, the reflecting plate 3 of the fourth embodiment is concentrically shaped into a curved plate having a circular plan view and a central portion protruding upward (forward). A plurality of reflecting plate recesses 3a... 3a are formed. As for the reflector 3 of the third embodiment, as shown in FIG. 9B, only one reflector recess 3a may be formed.

  These reflectors 3 will be described below. 7 to 9 are the same as those in the first embodiment shown in FIG. 1 to FIG. 3 and FIG. The “arrangement so as to have a spread in a plan view” is not limited to the arrangement shown in FIGS. 7A and 7B. For example, the arrangement is spread in a lattice shape or a matrix shape in the vertical and horizontal directions. There may be various directions such as directions. Further, as in the fourth embodiment, it is allowed to be displaced in the vertical (front-rear) direction.

  Of these reflectors 3, plate-like parts 3n are formed so as to surround each reflector recess 3a. Among the plate-like portions 3n, the outer edge surface portion 3n1 is located at the outer edge portion of the reflecting plate 3, and the connection portion 3n2 is located at the inner peripheral portion of the reflecting plate 3. That is, the connecting portion 3n2 is formed between the plurality of reflecting plate recesses 3a ... 3a. The reflector flange portion 3c in the first embodiment corresponds to the outer edge surface portion 3n1 in the second to fourth embodiments. Moreover, the edge part 3k of the partition wall part 3b in the said 1st Embodiment is corresponded to the connection part 3n2 of 2nd-4th embodiment. Moreover, in the case of the said 1st Embodiment, the position in the reflecting plate 3 of the reflecting plate flange part 3c corresponded to the said plate-shaped part 3n is not the longitudinal direction but this width direction (including the reflecting plate recessed part 3a) ( Evaluation is made with reference to the reflecting plate recess 3a in the case of being cut vertically in a direction perpendicular to the longitudinal direction.

  In 2nd Embodiment, as shown to Fig.7 (a), the outer edge surface part 3n1 and the connection part 3n2 are located on a horizontal surface. In 3rd Embodiment, as shown to Fig.9 (a), the connection part 3n2 is located on a horizontal surface, and as the outer edge surface part 3n1 goes to radial direction, it inclines below (back) and is formed. Yes. An upper surface (front surface) of the inclined outer edge surface portion 3n1 is an outer edge surface portion reflecting surface. In 4th Embodiment, as shown in FIG.7 (b) and FIG.9 (c), the outer edge surface part 3n1 and the connection part 3n2 are inclined and formed in the downward (rear) as it goes to radial direction. An upper surface (front surface) of the inclined outer edge surface portion 3n1 is an outer edge surface reflection surface, and an upper surface (front surface) of the connection portion 3n2 is a connection portion reflection surface. In this 4th Embodiment, one curved surface is comprised by the said outer edge surface part reflective surface and the said connection part reflective surface. As shown in FIG. 9 (c), this one curved surface has a portion closer to the outer edge (outer edge surface portion 3n1) in the plate-like portion 3n than the portion closer to the center (connecting portion 3n2) in the plate-like portion 3n of the reflecting plate 3. This is a curved surface with a large inclination angle with respect to the horizontal plane. For this reason, when the reflection bottoms 3d... 3d of the plurality of reflection plate recesses 3a... 3a are formed on the same surface, the reflection plate recesses 3a from the plate-like portion 3n as shown in FIG. The depth of the reflector plate 3 is shallower in the reflector recess 3 a located closer to the outer edge than in the reflector recess 3 a located closer to the center of the reflector 3. And the height (front-rear) dimension of the reflecting wall part (circumferential side wall part) 3e is also lower on the outer edge side than on the center side of the reflecting plate 3.

  Among the plate-like portions 3n, the inclination angles of the portions inclined downward (rearward) as described above (the outer edge surface portion 3n1 of the third embodiment, the outer edge surface portion 3n1 and the connection portion 3n2 of the fourth embodiment) are the third angle. An angle (a depression angle) δ of the outer edge surface portion 3n1 with respect to the horizontal plane of the embodiment (including the modification shown in FIG. 9B) is set to 5 ° to 50 °. Moreover, the angle of the outer edge position of the reflecting plate 3 on the basis of the horizontal plane passing through the center upper end of the reflecting plate 3 of the fourth embodiment (more specifically, the opening edge of the reflecting plate recess 3a located at the center of the reflecting plate 3). (Depression angle) ε is 5 ° or more and 50 ° or less. The angle δ and the angle ε are angles corresponding to the angle γ shown in FIG.

  The reflecting plate 3 of the second embodiment is preferably incorporated into a backlight in a display device used for, for example, an electric signboard. An example of the backlight is shown in FIG. In the backlight shown in FIG. 8A, corresponding to each light source L, the reflecting plate recess 3a, that is, the reflective bottom portion 3d having a circular shape and the reflecting wall portion (circumferential side wall portion) 3e surrounding the entire circumference of the reflecting bottom portion 3d. And are formed. Therefore, the space defined by the reflective bottom 3d and the reflective wall (circumferential side wall) 3e has an inverted frustoconical shape, and this space is arranged concentrically as shown in FIG.

  As in the first embodiment, the reflection wall portion (circumferential wall portion) 3e reflects the light from the light source L to guide it forward (see FIG. 8A). ). The plate-like portion 3n reflects the light emitted from the light source L and then reflected in the illuminating device, thereby guiding the light forward (the reflected light beam in FIG. ). Thus, since light can be uniformly guided to the front, the backlight can increase the forward irradiation efficiency.

  On the other hand, the reflector 3 of the fourth embodiment is preferably incorporated into, for example, a ceiling light installed on the ceiling or wall of a building. An example of the ceiling light is shown in FIG. Also in the ceiling light shown in FIG. 8 (b), corresponding to each light source L, the reflecting plate recess 3a, that is, the reflecting wall part (circumferential side wall part) 3e surrounding the entire circumference of the reflecting bottom part 3d and the reflecting bottom part 3d. And are formed. Therefore, the space defined by the reflective bottom 3d and the reflective wall (circumferential side wall) 3e has an inverted frustoconical shape, and this space is arranged concentrically as shown in FIG. 7B.

  As in the first embodiment, the reflection wall portion (circumferential side wall portion) 3e reflects the light from the light source L to guide it forward (the box X in FIG. 8B, forward). The rays going are indicated by solid arrows). And the outer edge surface reflection surface and the connection portion reflection surface in the plate-like portion 3n reflect the light that is emitted from the light source L and then reflected in the illumination device, and thus outward and forward of each reflection plate recess 3a. (A box Y in FIG. 8B, the reflected light beam is indicated by a broken line arrow). Thus, in the fourth embodiment, light can be spread outward as shown in FIG. 8B. Further, the inclination of the plate-like portion 3n and the reflection wall portion (circumferential side wall portion) 3e formed with the inclination lower on the radially outer side than on the radially inner side, thereby allowing light to be evenly forward and obliquely forward. Therefore, unevenness in illuminance can be reduced with the ceiling light or the like.

  In addition, in the reflector 3 of the third embodiment (including the modified form shown in FIG. 9B), the reflection of the light is not shown, but the outer edge surface portion 3n1 is inclined, so that the outer edge surface portion reflection is performed. The light reflected by the surface can be guided outward and forward of the reflecting plate 3. For this reason, since at least one part can be guide | induced to diagonally forward among the light emitted from several reflecting plate recessed part 3a ... 3a (inside light source L), the illuminating device incorporating the reflecting plate 3 of 3rd Embodiment Illuminance unevenness can be reduced.

  As described above, in the reflector 3 that needs to increase the forward illuminance, as in the second embodiment, as shown in FIG. 8A, the plate-like portion 3n of the reflector 3 reflects this reflection. Although it is usually configured as a flat surface facing the flat cover 1 located above (front) the plate 3, side illuminance (that is, illuminance in the outward direction of the diameter of the reflector 3) is required together with the front illuminance. When applied to a lighting device, the plate-like portion 3n is configured as a curved surface having a downward slope that inclines downward (backward) from the center of the reflecting plate 3 toward the outer edge as in the fourth embodiment. It may be. Since the plate-like portion 3n is curved as described above, as shown in FIG. 8B, illumination in which the cover 1 having the light diffusing and transmitting member is disposed from the upper side (front) to the side. In the apparatus, the light beam reflected by the cover 1 and returning to the reflection plate 3 occupying some percent of the light beam irradiated forward from the reflection plate concave portion 3a, than when the plate-shaped portion 3n is configured as a plane, It is possible to reflect more radially outward. For this reason, lateral illuminance can be increased.

  In particular, when the light source L is arranged on the reflection bottom 3d of the reflector recess 3a, a wide-angle light beam component (light beam directly emitted from the light source L) out of the light emitted from the light source L is reflected by the reflection wall portion (peripheral side wall). Part) Since the light is reflected forward by 3e, the side illuminance is reduced against the contrary. Furthermore, when the plate-like portion 3n is configured as a flat surface, multiple reflections in the forward direction occur, which contributes to further improving the forward illuminance. Therefore, in a lighting device that requires side illuminance such as a ceiling light, when such a planar reflector 3 is applied, the side illuminance is merely a flat plate that does not form the reflector recess 3a. There is a possibility that the side illuminance is significantly reduced as compared with the case where the reflector 3 is provided.

  Therefore, in the reflector 3 that satisfies the conditions of the predetermined range of the present invention, the front illumination efficiency in the reflector recess 3a can be increased, and the front illumination can be improved in advance. In addition, since the plate-like portion 3n is inclined as described above, the side illuminance can be improved by increasing the side reflection efficiency with respect to the return light beam reflected on the cover 1. .

  For example, as shown in FIGS. 7A and 7B, in the reflector 3 having a plurality of reflector recesses 3a... 3a arranged so as to spread, the outer edge of the reflector 3 as in the second embodiment. Inclination can be formed only on the outer edge surface portion 3n1 located at the outer edge surface portion 3n1, but the inclination can also be formed toward the outer edge surface portion 3n1 from the connecting portion 3n2 located on the inner peripheral portion. In this case, there may be a step between the connection portion 3n2 and the outer edge surface portion 3n1, or, as shown in FIGS. 7B and 9C, the connection portion 3n2 and the outer edge surface portion 3n1 are identical. Two curved surfaces may be formed. In the reflecting plate 3 having the step, when the depth of the plurality of reflecting plate recesses 3a... 3a is constant, a difference occurs in the position of the reflecting bottom 3d in each reflecting plate recess 3a, and light emission that follows them. Applicable to equipment. Further, when one curved surface is constituted by the connecting portion 3n2 and the outer edge surface portion 3n1, the reflecting plate moves from the starting point (center portion of the reflecting plate 3) to the ending point (outer edge portion of the reflecting plate 3). A position corresponding to the concave portion 3a is lost, and the height (front-rear) dimension of the reflector 3 is reduced. At this time, since the plate-like portion 3n does not exist at the position of the reflecting plate recess 3a, which is the defective portion, the front irradiation efficiency is reduced, but the height (front and rear) size of the reflecting plate 3 is relatively increased toward the outside of the diameter. The side irradiation light flux is increased by decreasing to a small value. It should be noted that the plate-like portion 3n near the center where the front illuminance is required does not form an inclination (a horizontal plane), and forms an inclination stepwise toward the outside by a specific part in one reflector 3 The proportion of the illuminance and the side illuminance may be adjusted for convenience.

  As for the inclination of the plate-like part 3n, when the descending slope is less than 5 °, the side irradiation efficiency is difficult to increase, and when it exceeds 50 °, the projected area for receiving the returning light flux from the front decreases, and the side irradiation efficiency is reduced. It may be difficult to go up, or light unevenness may occur due to irregular reflection. For this reason, when the taper angle is γ (see FIG. 10A), it is preferable that the angle is in the range of 5 ° ≦ γ ≦ 50 °. More preferably, 20 ° ≦ γ ≦ 40 °.

  Since the illumination device for mounting the reflector 3 according to the present invention is specialized in increasing the front irradiation efficiency as its main purpose, the cover 1 provided with the light diffusing and transmitting member above (front) the reflector 3 is provided. In the illuminating device used in combination, the distance ratio is preferably in the range of 0.1 <(H1 / H0) <0.3. Here, H1 is the height from the light source emitting part to the opening located at the front end of the reflecting plate 3, and H0 is the vertical (front-rear) direction distance from the light source emitting part to the inner surface of the cover 1 (see FIG. 10B). ). When (H1 / H0) ≦ 0.1, the distance from the reflector 3 to the cover 1 is too long, and the light is diffused or attenuated, so that it is difficult to improve the front illuminance, or the light extraction efficiency may be reduced. . When 0.3 ≦ (H1 / H0), the distance from the reflecting plate 3 to the cover 1 is (relatively) too short, and the light flux and shadow unevenness are generated because the front light flux by the reflecting plate 3 is increased. Sometimes.

  Although the reflector recesses 3a of the second to fourth embodiments have a reverse truncated cone shape, the present invention is not limited to this, and the shape of the plan view has a large number of inverted truncated cones such as a triangle, a quadrangle, and a hexagon. The shape may be a pyramid shape or a polygonal frustum shape, and a polyhedral surface that does not correspond to the shape of the reflective bottom 3d or the opening may be provided on the inner surface, or these shapes may be combined with each other. Further, the reflecting plate recess 3a does not need to surround the entire circumference of the light source L. For example, as shown in FIGS. 6 (a) and 6 (f), the inner surface is formed only on two opposing surfaces having a V-shaped cross section. Good. Therefore, it has a cross-sectional shape that can specify each of the dimensions L1, L2, and H, and at least half of the inner surface should satisfy a predetermined range of conditions with the intention of increasing the forward illuminance. Furthermore, when a plurality of reflecting plate recesses 3a... 3a are formed, the above condition may be satisfied only by a part of the reflecting plate recesses 3a in the reflecting plate 3 in order to increase the forward illuminance.

  Moreover, in the said 2nd-4th embodiment, although several reflective-plate recessed part 3a ... 3a is formed apart as shown in figure, arrangement | positioning of the reflective-plate recessed part 3a on the reflective plate 3 is limited to this. It is not a thing, and some reflection plate recessed part 3a ... 3a, for example, reflection wall part 3e ... 3e etc., may overlap and be formed. In this case, the height of the reflection wall portion (peripheral side wall portion) 3e in the overlapping portion is formed lower than that in the non-overlapping portion. Thus, the form which assembled the some reflecting plate recessed part 3a can increase the quantity of the light sources L, and can raise the illumination intensity of an illuminating device in a spot. Further, by arranging two or more different color light sources L in the plurality of reflecting plate recesses 3a, the color mixture of light is promoted and the color rendering property is excellent. In addition, when the said several reflecting plate recessed part 3a ... 3a overlaps and is formed, the positional relationship with the plate-shaped part 3n is evaluated on the basis of each reflecting plate recessed part 3a.

  The reflector and the illumination device according to the present invention are not limited to the first to fourth embodiments, and various modifications can be made without departing from the gist of the present invention. In addition, the configurations and methods of the plurality of embodiments may be arbitrarily adopted and combined (the configuration and method according to one embodiment may be applied to the configurations and methods according to other embodiments). Furthermore, it goes without saying that configurations and methods according to various modifications described below may be arbitrarily selected and employed in the configurations and methods according to the above-described embodiments.

  For example, in the above-described embodiment, the cover 1 is cut out by forming the side opening 1b in the outer peripheral portion of a cylindrical shape (a cylindrical shape curved with a certain curvature), and has a cross-sectional shape orthogonal to the longitudinal direction. Although it is formed in a substantially “C” shape, it is not limited to this, and may be a shape in which the outer peripheral portion of a polygonal cylinder or an elliptic cylinder is cut out.

  Moreover, in the said embodiment, the cover 1 and light source accommodation are carried out so that the cover 1 may fit from the width direction outer side of the light source container 2 by expanding the side opening part 1b to the width direction (left-right direction) with external force. The body 2 or the like is configured (fitting from the outside), but is not limited to this, and the side opening 1b is reduced in the width direction (left-right direction) by an external force, whereby the light source container 2 The cover 1, the light source container 2, and the like may be configured so that the cover 1 is fitted from the inner side in the width direction (fitting from the inner side).

  Moreover, in the said embodiment, it can be elastically deformed so that the side opening 1b may be expanded in the width direction by receiving a downward external force applied to the cover 1 toward the light source container 2. The side opening 1b may be elastically deformable so that the side opening 1b expands or contracts in the width direction by, for example, pinching or gripping the cover 1 by an operator.

  Moreover, in the said embodiment, the two latching protrusions 1d and 1d of the cover 1 serve as the container flange 2b of the light source container 2, the reflector flange 3c of the reflector 3, and the diffuser flange 4b of the diffuser 4. Although it is comprised so that each may be fixed by pinching, it is not limited to this, The fitting part (not shown) in which the reflecting plate 3 was separately formed in the container flange part 2b of the light source container 2 You may be comprised so that it may be supported by fitting with respect to. This fitting part is a groove | channel along the longitudinal direction opened, for example facing the width direction inner side, Comprising: It can be set as the shape which can support the width direction edge part of the reflecting plate 3. FIG.

  Moreover, in the said embodiment, although the latching protrusion 1d is continuously formed in the longitudinal direction (without interruption), it is not limited to this, You may be formed intermittently. Further, the cross-sectional shape of the locking projection 1d is not limited to the triangle of the above embodiment, and may be a quadrangle or a semicircle.

  Moreover, in the said embodiment, although the light source container 2 which is a base part consists of one member, it is not limited to this, The base part may be comprised combining the several member. In addition, a part of the members constituting the base part may be a light-transmitting member like the cover 1. By carrying out like this, a part of light can be irradiated also from a base part.

  Moreover, in the said embodiment, although the reflecting plate 3 is provided with the some partition wall part 3b, it is not limited to this, As shown to Fig.6 (a), it is in the longitudinal direction of the reflecting plate 3. As shown in FIG. A plurality of openings 3g may be formed in the reflecting bottom 3d by forming the reflecting plate recess 3a along the same. The reflection plate 3 having this configuration can be formed by bending a plate-like material.

  Moreover, in the said embodiment, as shown in FIG.3 (b), the edge part 3k of the partition wall part 3b located in the open direction side of the reflecting plate recessed part 3a is the edge part 3m located in the opening direction of the reflecting plate recessed part 3a. However, the present invention is not limited to this, and as shown in FIGS. 6B and 6C, it is substantially the same as the end portion 3m positioned in the opening direction of the reflecting plate recess 3a. You may be comprised so that the edge part 3k of the partition wall part 3b may be located in the same position. In addition, what is shown in FIG.6 (c) is what the upper surface of the edge part 3k of the reflecting plate recessed part 3a was made into the flat surface.

  Moreover, in the said embodiment, although the one opening part 3g is provided between the partition walls 3b and 3b, it is not limited to this, As shown in FIG. May have two openings 3g.

  Moreover, in the said embodiment, although the space demarcated by a pair of opposing partition wall parts 3b and 3b and the reflecting plate recessed part 3a becomes a reverse truncated polygonal pyramid shape or a polygonal frustum shape, it is limited to this. Instead, as shown in FIG. 6 (e), the reflecting plate recess 3a may be configured to form a reverse truncated cone-shaped space in which the opening 3g is located at the bottom. .

  Moreover, in the said embodiment, although the reflecting plate 3 consists of one member, it is not limited to this, As shown in FIG.6 (f), it consists of the two members 31 and 31 which oppose, between each member. You may be comprised so that the light source L can be located.

  Further, in order to give rigidity to the outer edge portion of the reflecting plate recess 3a or the outer edge portion of the reflecting plate 3, convex or concave ribs may be formed within a range that does not affect the reflection characteristics. A plurality of light sources L ... L may be arranged at the bottom of the reflector recess 3a (see FIG. 6D). Further, the reflector 3 may be provided with a configuration for fixing to the lighting device or a configuration for interconnection within a range that does not affect the reflection characteristics.

  Further, the reflector 3 of the first embodiment is incorporated in an illumination lamp in which the appearance of the light emitting portion is a straight tube, but is not limited thereto, a circular illumination lamp, The fluorescent lamp is suitable for an incandescent lamp socket, and may be incorporated into an illumination lamp having a shape corresponding to a fluorescent lamp having a light-emitting portion with a curved axis by bending and folding the tube.

  Moreover, although the said embodiment is an illumination lamp using LED, it is not limited to this, The illumination lamp using light-emitting elements (for example, organic EL element) other than LED as a light-emitting body may be sufficient.

  Next, since the inventor of this application made and evaluated the reflector (refer FIG. 11) which concerns on Examples 1-12 and Comparative Examples 1-12, it describes below. In addition, this invention is not limited to the form which concerns on Examples 1-12.

(Evaluation method)
At the time of evaluation, as shown in FIG. 10B, a combination of light source module Lm using LED as light source L, reflector 3, light source container 2, and cover 1 (evaluation lighting device) was used.

(Evaluation lighting device)
First, prior to the evaluation, the board size is 60 mm × 60 mm and one LED in the center (“SMD LED Model # LU6-FWH1-03-N5-NS” manufactured by Cree, chip size: 3.3 mm (one side on the plane side) Dimension) x 3.5 mm (dimension on the other side of the plane) x 2 mm (height dimension), radiation angle (2θ): 180 °, half-value angle (2θ _1/2 ): 120 °) Prepared a 0.1 W light source module Lm.

(reflector)
Thermoplastic resin non-foamed sheet (thickness: 0.55 mm, overall density: 1.1 g / cm ³ , total light reflectance on one surface is 99.0%, diffuse reflectance is 97.0%, total light reflectance The portion corresponding to the reflecting plate concave portion 3a and the outer edge surface portion 3n1 is formed in the shape shown in FIG. 11 by heating and heating so that the surface temperature is 140 ° C. (In FIG. 11, the plan view shape and the vertical end face view shape are described for each of the examples and comparative examples), and each part size (design dimension) described in Table 1 is formed (in Table 1). 10 (a) and 10 (b), an opening 3g which is a 5.5 mm × 5.5 mm through-hole for allowing the LED to be inserted from the back side into the reflection bottom 3d of the reflector recess 3a is formed. And the position of φ53mm around the opening 3g A reflection plate 3 having a circular shape in plan view cut to be an outer edge was produced. In Table 1, “normal” of “light reflector type” refers to the reflector 3 in which a portion corresponding to the outer edge surface portion 3n1 is formed horizontally, and “taper” corresponds to the outer edge surface portion 3n1. It refers to the reflecting plate 3 formed so that at least a part of the portion is inclined.

  In addition, about the outer edge surface part 3n1, about Examples 1-6 and Comparative Examples 1-6, it was set as the flat thing extended in a horizontal direction. Moreover, the taper part was formed about Examples 7-12 and Comparative Examples 7-12. That is, at least a part of the outer edge surface portion 3n1 has a shape that inclines downward (backward) toward the horizontal plane at an angle γ (see FIG. 10A) as it goes outward. Of the reflecting plate 3 formed with the tapered portion, Examples 7 to 8 and Comparative Example 10 are simply downward (rear) from the opening edge of the reflecting plate recess 3a to the outer peripheral edge of the reflecting plate 3 uniformly. An inclined taper portion was formed. In Examples 9 to 12 and Comparative Examples 7 to 9 and 11 to 12, in addition to the tapered portion, a flat portion was formed on the opening edge side of the reflecting plate recess 3 a or on the outer peripheral edge side of the reflecting plate 3.

  Further, in Examples 4 and 8, the reflection inner wall surface 3f was formed into a curved surface having a circular arc whose longitudinal cross-sectional shape has a radius R (see FIG. 10A). In addition, about another Example and a comparative example, the reflection inner wall surface 3f is formed in the surface where a longitudinal cross-sectional shape has a straight line.

  In addition, as a reference example for making a comparative reference for evaluation, a flat reflector 3 made of the same material as the reflector 3 according to each of the examples and the comparative example is formed into a disc shape having a diameter of 53 mm, and 5.5 mm in the center. A x5.5 mm through hole (corresponding to the opening 3 g) was formed.

(Evaluation sample)
The reflecting plate 3 according to each of the examples and the comparative examples was mounted so as to expose the light emitting portion of the LED from the opening 3g provided in the reflecting bottom 3d, and used as an evaluation sample.

(Lighting device)
Next, as shown in FIG. 10B, the evaluation cover 1 formed into a substantially hemispherical shape having a cavity having an inner radius of 29.5 mm and a central angle of 202.5 ° and the evaluation light source accommodation A body 2 was prepared, and the evaluation sample was placed on the light source housing 2 and covered with the cover 1 from above to produce an evaluation illumination device. The cover 1 has a thickness of 1.5 mm and a light transmittance of 58%. In addition, in order to incorporate the reflectors 3 having different heights according to the respective examples and comparative examples into the evaluation illumination device, the size of the reflector 3 is provided between the back surface of the evaluation sample and the bottom of the light source container 2. The height was adjusted by inserting a spacer according to the above.

  In the evaluation illumination device, the light emitting part of the LED and the reflection plate 3 are housed between the cover 1 and the light source housing 2. For this reason, all of the upper side (front side) and the side of the reflecting plate 3 face the cover 1. At this time, the distance from the light emitting portion of the LED mounted on the reflecting bottom 3d of the reflecting plate 3 to the inner surface of the cover 1 vertically above is H0. Moreover, the height dimension from the light emission part of LED to the upper end of the reflecting plate recessed part 3a of the reflecting plate 3 is H1 (refer FIG.10 (b)).

(Measurement and evaluation of front illuminance and side illuminance)
In the evaluation illumination device, the center point (0 °) on the surface of the cover 1 positioned vertically above the LED and the point on the surface of the cover 1 at the outer side 90 ° on the side surface side from the point were used as measurement points. . In a state where the evaluation illumination device is energized and the LED is made to emit light, the light receiving part of the illuminometer ("Digital illuminometer T-1" manufactured by Konica Minolta) T is vertically contacted from above to the 0 ° measurement point. The illuminance was measured five times at regular time intervals, and the arithmetic average value was defined as the forward illuminance (0 ° illuminance) of the lighting device. Similarly to the 0 ° illuminance, the light receiving part of the illuminometer T is brought into contact with the measurement point of the outer side 90 ° on the side surface from the normal direction to the surface of the cover 1 so that the illuminance can be measured at any five locations in the circumferential direction. The arithmetic average value was measured as the side illuminance (90 ° illuminance) of the lighting device.

  The evaluation of the front illuminance and the side illuminance is based on the distance H0 to the cover 1 above (front) from the light emitting part of the LED in the evaluation illumination device incorporating the flat reflector 3 as the reference example. The front illuminance (0 ° illuminance) and the side illuminance (90 ° illuminance) are measured in the same manner as each of the above examples and comparative examples, and the front illuminance and side illuminance (“flat illuminance” in Table 1) are used as a reference (100 %), The relative ratio (%) related to the increase / decrease was calculated for the front illuminance and the side illuminance of the evaluation illumination device incorporating the reflector 3 according to each example and comparative example. Then, with respect to the relative ratio of the front illuminance and the side illuminance, those that increase by 40% or more with respect to the front illuminance are judged as “good”, and those that increase by 10% or more are acceptable “Δ” An increase of less than% was judged as “No”. Next, with respect to the side illuminance, a decrease of -10% or an increase is good, "○", a decrease of -25% is acceptable, "△", a decrease of -25% or more Was determined as “No”.

(Evaluation of uniform visibility)
The light emission state in the range from the top (front) of the cover 1 of each evaluation lighting device to the side (0 ° to 90 °) was evaluated based on visual judgment. And, when the light emission unevenness is hardly visually recognized, “Good”, when the linear light emission unevenness (shadow) is slightly visible “△”, when the clear light emission unevenness (shadow) is visually recognized Was determined to be impossible “×”.

(Comprehensive judgment)
Comprehensive determination was performed based on each evaluation result of the said front illumination intensity, side illumination intensity, and uniform visibility. Here, when the determination of the front illuminance is good “◯” and both the side illuminance and the uniform visibility are both acceptable “Δ” or more, the overall determination is passed “O”, and the front illuminance is acceptable “Δ” The case where the determination is “x” is not possible for any of the following determinations, or either the side illuminance or the uniform visibility is determined as “failed” “x”.

  The evaluation results are also shown in Table 1. Thus, the superiority of the present invention was confirmed by the fact that the examples were highly evaluated compared to the comparative examples.

DESCRIPTION OF SYMBOLS 1 ... Cover, 2 ... Light source container, 3 ... Reflecting plate, 3a ... Reflecting plate recessed part, 3b ... Peripheral side wall part (partition wall part), 3c ... Outer edge surface part (reflecting plate flange part), 3d ... Bottom part of reflecting part recessed part (Reflection bottom part), 3e ... peripheral wall part (reflection wall part), 3f ... inner reflection surface (reflection inner wall surface, peripheral wall surface), 3j ... inner reflection surface (wall surface, peripheral wall surface in partition wall part), 3n ... Plate-shaped part, 3n1 ... outer edge surface part, 3n2 ... connection part, 4 ... diffusion plate, 5 ... base, L ... light source (light emitting diode)

Claims (6)

It is a reflector that reflects light emitted from a light source built into a lighting device,
A reflector recess where at least a portion of the light source is located;
The reflector concave portion has a bottom portion on which a light source light emitting portion that emits light among the light sources is located, and an inner reflection surface that is inclined outwardly from an outer edge portion of the bottom portion and reflects light from the light source light emitting portion. A side wall, and
The peripheral side wall has a vertical cross-sectional shape that connects the front end of the inner reflection surface and the outer edge of the bottom with an arc.
The distance between the outer edge portions facing each other across the light source light emitting portion at the bottom portion is L1, the distance between the front ends facing each other across the light source light emitting portion of the inner reflection surface is L2, and the inner reflection surface The distance in the front-rear direction from the rear end to the front end is H, the radius of the arc is R, and a straight line connecting the front end of the inner reflection surface and the outer edge of the bottom in a longitudinal section is the normal of the bottom When the angle formed is β , a reflector satisfying the following formula:
2.4 ≦ L2 / H ≦ 5.5
1.0 ≦ (L2-L1) /H≦2.2
R = [{(L2-L1) / 2} ² + H ² ] ^0.5 / {2 × sin (7.5 ° + | 37.5 ° −β |)} An outer edge surface part is provided on at least a part of the outer edge part of the reflector,
The outer edge surface portion has an outer edge surface reflecting surface that inclines backward as it goes outward,
The outer surface portion reflecting surface, the light reflected within the illumination device after being emitted from the light source emitting portion, by reflection, according to claim 1, characterized in that leads to the side of the illumination device Reflector. A plurality of the reflector recesses,
In addition to the outer edge surface portion, further comprising a connecting portion between the plurality of reflector concave portions,
The connecting portion has a connecting portion reflecting surface that inclines backward as it goes outward from the center of the reflecting plate in plan view.
The connecting portion reflecting surface, the light reflected by the illuminating device after being emitted from the light source emitting portion, by reflection, according to claim 2, characterized in that leads to the side of the illumination device Reflector. The plurality of reflecting plate recesses are arranged in a plane direction,
The reflecting plate according to claim 3 , wherein the outer edge surface reflection surface and the connection portion reflection surface form one curved surface. An illumination comprising the reflector according to any one of claims 1 to 4 and at least one point light source in which the light source light emitting unit is located in the concave portion of the reflector. apparatus. The illumination device according to claim 5 , further comprising a cover that is positioned in front of the point light source and allows light from the light source light emitting unit to diffuse and pass therethrough.

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