JP2018186006A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of performing light distribution control with a simple structure.SOLUTION: A luminaire 1 includes: a first light source 11b; a second light source 13b arranged in a place different from the first light source 11b; and a light guide plate 8 including an incident surface 8a where light enters, a light diffusion surface 8b which crosses the incident surface 8a and in which light diffuses, and an emission surface 8c which is on the opposite side from the light diffusion surface 8b and from which the light emits. Also, on the light diffusion surface 8b, a plurality of optical structures 81 are formed having a first reflection surface 82a for reflecting light, and also, having a convex shape or a concave shape. Furthermore, at least one of the first light source 11b and the second light source 13b is arranged oppositely from the first reflection surface 82a via the incident surface 8a. The light guide plate 8 emits light of a first light distribution angle from the emission surface 8c in the case where the first light source 11b is lighted, and emits light of a second light distribution angle larger than the first light distribution angle from the emission surface 8c, in the case where the second light source 13b is lighted.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a lighting device using a light guide plate.

  Conventionally, an illuminating device including a first light source, a second light source, and a light guide plate has been disclosed (see, for example, Patent Document 1). The light guide plate is taken in from the first light incident surface on which light from the first light source enters, the second light incident surface in which light from the second light source enters, and the first light incident surface and the second light incident surface. A light emitting surface that guides and emits the emitted light, and a facing surface that faces the light emitting surface.

  A first microstructure having a reflecting surface that reflects only light from the first light source and a second microstructure having a reflecting surface that reflects only light from the second light source are formed on the opposing surface. Yes.

  In this illuminating device, when the first light source is turned on, the light is reflected by the reflecting surface of the first fine structure to illuminate the first light emitting region. Moreover, in this illuminating device, when the 2nd light source is lighted, light reflects with the reflective surface of a 1st fine structure, and illuminates a 1st light emission area | region.

JP 2012-182017 A

  However, in a normal lighting device, it is only possible to switch the lighting in different places, and in houses, offices, warehouses, etc., light distribution control can be performed in order to illuminate the area where the user exists. Not done. Therefore, if the irradiation positions of the first light source and the second light source are changed, the area illuminated by the lighting device can be changed, but the facilities of the lighting device are complicated.

  Accordingly, an object of the present disclosure is to provide an illumination device that can perform light distribution control with a simple configuration.

  In order to achieve the above object, an illumination device according to an aspect of the present invention includes a first light source, a second light source disposed at a different location from the first light source, an incident surface on which light is incident, and the incident surface. And a light guide plate having a light diffusion surface on which light is diffused and a surface opposite to the light diffusion surface, and an emission surface from which light is emitted, the light diffusion surface, A plurality of optical structures having a reflecting surface for reflecting light and having a convex shape or a concave shape are formed, and at least one of the first light source and the second light source is connected to the reflecting surface via the incident surface. The light guide plate is disposed to face the first light distribution angle when the first light source is turned on and the first light distribution angle is emitted from the emission surface and the second light source is turned on when the first light source is turned on. A light having a larger second light distribution angle is emitted from the emission surface.

  According to the illumination device of the present disclosure, light distribution control can be performed with a simple configuration.

FIG. 1 is a perspective view of the lighting apparatus according to Embodiment 1. FIG. 2 is a cross-sectional view of the lighting apparatus according to Embodiment 1 taken along the line II-II in FIG. FIG. 3 is an exploded perspective view of the lighting apparatus according to Embodiment 1. FIG. FIG. 4 is a plan view showing the light guide plate, the first light emitting module, and the second light emitting module in the lighting apparatus according to Embodiment 1. FIG. 5 is a diagram illustrating an optical structure of the light guide plate of the lighting apparatus according to Embodiment 1. FIG. 6 is an image diagram when the first light emitting module and the second light emitting module of the lighting apparatus according to Embodiment 1 are selectively lit. FIG. 7 is a perspective view showing an optical structure used in the simulation analysis. FIG. 8 is a diagram showing a light distribution curve when the optical structure of FIG. 7 is used. FIG. 9 is a diagram showing a light distribution curve when the optical structure of FIG. 7 is used. FIG. 10 is a diagram showing a light distribution curve when the optical structure of FIG. 7 is used. FIG. 11 is a diagram showing a light distribution curve when the optical structure of FIG. 7 is used. FIG. 12 is a diagram showing an optical structure in an illumination apparatus according to a modification of the first embodiment. FIG. 13 is a plan view showing the light guide plate, the first light emitting module, and the second light emitting module in the lighting apparatus according to Embodiment 2. FIG. 14 is a diagram showing a light distribution curve when the optical structure of FIG. 7 is used. FIG. 15 is a plan view showing a light guide plate, a first light emitting module, and a second light emitting module in an illumination apparatus according to a modification of the second embodiment. FIG. 16 is a diagram showing a light distribution curve when the optical structure of FIG. 7 is used.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components shown in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  In addition, the description of “substantially **” is intended to include not only exactly the same, but also those that are recognized as being substantially the same, with “substantially identical” as an example.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
[Constitution]
FIG. 1 is a perspective view of lighting apparatus 1 according to Embodiment 1. FIG. FIG. 2 is a cross-sectional view of lighting apparatus 1 according to Embodiment 1 taken along line II-II in FIG. FIG. 3 is an exploded perspective view of the lighting device 1 according to the first embodiment. FIG. 4 is a plan view showing the light guide plate 8, the first light emitting module 11, and the second light emitting module 13 in the lighting device 1 according to the first embodiment. FIG. 5 is a diagram showing an optical structure 81 in the light guide plate 8 of the illumination device 1 according to the first embodiment.

  FIG. 5A is a partially enlarged perspective view showing the optical structure 81 in the light guide plate 8 of the lighting device 1. FIG. 5B is a plan view showing the optical structure 81 in the light guide plate 8 of the lighting device 1. FIG. 5C is a cross-sectional view showing the optical structure 81 of the light guide plate 8 taken along the line Vc-Vc in FIG. FIG. 5D is a cross-sectional view showing the optical structure 81 of the light guide plate 8 taken along the line Vd-Vd in FIG.

  In FIG. 1, in the lighting device 1, the longitudinal direction of the optical structure 81 is defined as the X-axis direction, the direction orthogonal to the X-axis direction and parallel to the light guide plate 8 is defined as the Y-axis direction, and the X-axis direction. A direction intersecting with the Y-axis direction is defined as a Z-axis direction. Then, each direction shown in each figure after FIG. 2 is displayed in correspondence with each direction shown in FIG.

  As shown in FIG. 1, the lighting device 1 is a downlight using an edge light type light guide plate 8 and is embedded in a construction material such as a ceiling and a wall. Moreover, the illuminating device 1 is not limited to a downlight, A spotlight, a pendant light, etc. may be sufficient. The illuminating device 1 is attached to construction materials, such as a house, an office, a warehouse, for example.

  As shown in FIGS. 1 to 3, the lighting device 1 includes a first case 3, a second case 5, a control circuit 6, a power supply unit 7, a reflection plate 9, a light guide plate 8, and a plurality of first cases. One light emitting module 11, a plurality of second light emitting modules 13, a holding member 10, a fixed frame 15, a packing 17, and a mounting bracket 19 are provided. The reflection plate 9 may be a reflection sheet.

  The first case 3 is a casing that is flat in the Z-axis direction and has a bottomed cylindrical shape, and is open on the Z-axis plus direction side. The second case 5 is a casing having a bottomed cylindrical shape that is flat in the Z-axis direction and is open on the Z-axis minus direction side. On the Z axis plus direction side of the first case 3, the second case 5 is covered and fixed in a fitted state. The method of fixing the second case 5 to the first case 3 is realized by a fixing member such as a screw or a bolt.

  A plurality of through holes 3 a are formed in the bottom wall of the first case 3. At least a part of the plurality of through holes 3 a engages with the reflecting plate 9. The bottom wall of the first case 3 is a wall portion on the Z axis minus direction side of the first case 3.

  The second case 5 accommodates the control circuit 6. A control circuit 6 is fixed to the bottom wall of the second case 5. The bottom wall of the second case 5 is a wall portion of the second case 5 on the Z axis plus direction side. A power supply unit 7 is fixed to the surface of the bottom wall of the second case 5 on the Z axis plus direction side.

  The control circuit 6 has an electronic circuit for adjusting DC power output from the power supply unit 7 to the plurality of first light emitting modules 11 and the plurality of second light emitting modules 13. The control circuit 6 controls operations such as lighting, extinguishing, dimming, and toning of the first light emitting module 11 and the second light emitting module 13 in accordance with a control signal from a remote controller or the like. For example, the control circuit 6 controls the power source unit 7 to increase the brightness of the first light emitting module 11 and controls the power source unit 7 to decrease the brightness of the second light emitting module 13. The light emission of the module 11 and the second light emitting module 13 is controlled. The control circuit 6 includes a circuit for controlling the first light emitting module 11, the second light emitting module 13, and the like. The control circuit 6 realizes these operations by a microcomputer, a processor, or a dedicated circuit that controls current values supplied to the first light emitting module 11 and the second light emitting module 13 in accordance with the input signals.

  The power supply unit 7 is formed in a metal box shape, and houses a substrate on which circuit components such as a lighting circuit are mounted. A power cable from a commercial AC power supply is connected to the power supply unit 7 and the commercial AC power is supplied to the lighting circuit.

  The reflection plate 9 is a member that reflects the light guided through the light guide plate 8 and uses, for example, a hard white resin material such as polybutylene terephthalate (PBT). The reflection plate 9 reflects light toward the light guide plate 8. The reflecting plate 9 is a hexagonal flat plate.

  The reflecting plate 9 has a mirror surface portion 9a and a plurality of engaging portions 9b. The mirror surface portion 9 a has a mirror surface on the Z-axis minus direction side and is disposed on the surface of the light guide plate 8 on the Z-axis plus direction side. The mirror surface portion 9a has a hexagonal flat plate shape. The engaging portion 9b is a standing wall that rises from the outer peripheral edge of the mirror surface portion 9a toward the Z-axis plus direction. Each engaging portion 9b is engaged with the first light emitting module 11 and the second light emitting module 13, and the rotation of the reflecting plate 9 is restricted.

  The light guide plate 8 is an even-numbered polygonal shape in plan view, and is an optical member that guides light emitted from the first light emitting module 11 and the second light emitting module 13. The light guide plate 8 is a translucent member such as a resin such as acrylic or polycarbonate, or glass, but may be formed of any other material as long as it has translucency. In the present embodiment, the light guide plate 8 has a hexagonal shape. However, the light guide plate 8 is not limited to an even-numbered polygonal shape such as a square shape, and may be a circular shape or other shapes.

  The light guide plate 8 may be arranged on the surface of the mirror surface portion 9a on the Z axis minus direction side so as to be in close contact with the mirror surface portion 9a of the reflection plate 9. The light guide plate 8 has an incident surface 8a, a light diffusion surface 8b, and an output surface 8c.

  As shown in FIGS. 3 to 5, the incident surface 8 a is a surface on which light emitted from the first light emitting module 11 and the second light emitting module 13 is incident, and is an outer peripheral side surface of the light guide plate 8. The incident surface 8a intersects with the light diffusion surface 8b and the exit surface 8c. The incident surface 8a is disposed substantially perpendicular to the optical axis of the first light emitting module 11 and the optical axis of the second light emitting module 13 so that light emitted from the first light emitting module 11 and the second light emitting module 13 is incident thereon. May be. In the present embodiment, the light guide plate 8 has a hexagonal shape, and thus has six incident surfaces 8a. The incident surface 8a is a substantially uniform plane when the light guide plate 8 has a polygonal shape. The incident surface 8a is, for example, a curved surface when the light guide plate 8 is circular.

  The light diffusion surface 8 b is a surface on which light to be guided is diffused, and is a surface on the Z axis plus direction side of the light guide plate 8. The light diffusing surface 8b may be in close contact with the mirror surface portion 9a of the reflecting plate 9. A plurality of convex or concave optical structures 81 are formed on the light diffusion surface 8b.

  The optical structure 81 has a long shape substantially parallel to the X-axis direction. In the optical structure 81, the longitudinal direction of the optical structure 81 is substantially orthogonal to the optical axis of the first light emitting module 11 when the light guide plate 8 is viewed from the Z axis plus direction side. The width in the Y-axis direction of the optical structure 81 is larger than the height or depth of the optical structure 81. The Y-axis direction in the optical structure 81 is an example of the short direction.

  The plurality of optical structures 81 are regularly arranged on the light diffusion surface 8b. Specifically, the optical structures 81 are regularly arranged in a matrix shape, a staggered lattice shape, or the like. That is, the optical structures 81 are not randomly arranged. Note that the regularity of the arrangement is not limited to a matrix shape, a staggered lattice shape, or the like. In the present embodiment, the plurality of optical structures 81 are arranged in a matrix so that the longitudinal directions of the optical structures 81 are substantially parallel.

  The optical structure 81 is a long polyhedron, and is a polyhedral structure that is a substantially isosceles triangle in a cross section in the Y-axis direction. In the present embodiment, the optical structure 81 has a substantially isosceles triangular cross section substantially parallel to the optical axis of the first light emitting module 11 and is linear along the X-axis direction perpendicular to the cross section. Accordingly, a concave shape is formed by cutting out a part of the light diffusion surface 108b. That is, the optical structure 81 is a triangular prism-like concave shape. The optical structure 81 is not limited to the concave shape in which the light diffusion surface 8b of the light guide plate 8 is recessed, but may be formed in a convex shape that protrudes from the light diffusion surface 8b of the light guide plate 8 to the Z axis plus direction side. .

  The length of the optical structure 81 in the X-axis direction is about 0.5 mm to 5 mm. In particular, the thickness is preferably about 1 mm to 3 mm.

  The optical structure 81 may be formed using, for example, a drilling tool such as a diamond tool, or may be formed using a mold, and the manufacturing method is not particularly limited.

  As shown in FIGS. 4 and 5, the optical structure 81 is long in the X-axis direction, faces a pair of first reflecting surfaces 82 a that reflects light, and both ends of the pair of first reflecting surfaces 82 a, A pair of second reflecting surfaces 82b for reflecting light.

  The first reflecting surface 82a is inclined so as to reflect the light from the first light emitting module 11 and the second light emitting module 13 incident from the incident surface 8a of the light guide plate 8 toward the emitting surface 8c. When viewed from the vertical direction of the light diffusing surface 8b, the optical structure 81 has a light diffusing surface 8b so that the straight line connecting both ends of the second reflecting surface 82b and the optical axis of the first light emitting module 11 are substantially orthogonal. Is formed. As a result, the light incident from the first light emitting module 11 is reflected by the first reflecting surface 82a of the optical structure 81 toward the emitting surface 8c.

  As shown in FIGS. 3 to 5, the emission surface 8 c is a surface opposite to the light diffusion surface 8 b and is a surface from which the guided light is emitted. That is, the exit surface 8 c is a surface on the negative side of the Z axis that is substantially orthogonal to the entrance surface 8 a of the light guide plate 8. The outer peripheral edge side of the emission surface 8 c is in contact with a ring portion 10 a described later of the holding member 10.

  As shown in FIGS. 2 and 3, the holding member 10 is a member that holds the light guide plate 8 in a predetermined position, and can accommodate the light guide plate 8. Specifically, the holding member 10 holds the light guide plate 8 so that the light diffusion surface 8b of the light guide plate 8 is brought into contact with the mirror surface portion 9a of the reflection plate 9. The holding member 10 has a shape equivalent to that of the light guide plate 8 so as to correspond to the shape of the light guide plate 8. That is, the holding member 10 may have a polygonal shape, a circular shape, or other shapes. In the present embodiment, the holding member 10 has a hexagonal shape in plan view. The holding member 10 is made of a metal member or a resin member. The holding member 10 is a member that holds the plurality of first light emitting modules 11 and the plurality of second light emitting modules 13 at predetermined positions.

  The holding member 10 includes a ring portion 10a and a plurality of engagement holding portions 10b. The ring portion 10 a has a flat plate shape and is in contact with the outer peripheral edge of the light exit surface 8 c of the light guide plate 8. The ring portion 10a is configured so as not to hinder light emitted from the emission surface 8c as much as possible. In the present embodiment, the ring portion 10a has a hexagonal shape in plan view. In the ring part 10a, the light emitted from the light guide plate 8 passes through the opening of the ring part 10a.

  The engagement holding portion 10b is a standing wall that rises from the outer peripheral edge of the ring portion 10a toward the Z-axis plus direction. The engagement holding portion 10 b is in contact with the incident surface 8 a of the light guide plate 8 so as to be along the Z-axis direction at the corner portion of the light guide plate 8. In the present embodiment, six engagement holding portions 10b are formed and correspond to the six corner portions of the light guide plate 8 on a one-to-one basis. That is, each engagement holding portion 10 b holds each corner portion of the light guide plate 8, thereby suppressing the rotation and movement of the light guide plate 8. In this way, the light guide plate 8 is prevented from being separated from the reflection plate 9 and rotated with respect to the first light emitting module 11 and the second light emitting module 13 by the holding member 10.

  The plurality of first light emitting modules 11 and the plurality of second light emitting modules 13 are arranged on the outer peripheral side of the light guide plate 8 so as to surround the periphery of the light guide plate 8, and emit light that is emitted from the lighting device 1. The plurality of first light emitting modules 11 and the plurality of second light emitting modules 13 are arranged to face each incident surface 8 a so that light is incident on the incident surface 8 a of the light guide plate 8 by the holding member 10. The 1st light emission module 11 or the 2nd light emission module 13 is opposingly arranged by the entrance plane 8a so that it may correspond to each entrance plane 8a on a one-to-one basis.

  Each of the plurality of first light emitting modules 11 and the plurality of second light emitting modules 13 includes a power feeding unit 14. Each power feeding portion 14 corresponds to each through hole 3 a of the first case 3 on a one-to-one basis. Each power feeding section 14 is inserted through each through hole 3 a and is electrically connected to the control circuit 6.

  In the present embodiment, two first light emitting modules 11 are provided on the outer periphery of the light guide plate 8. One first light emitting module 11 is disposed opposite to the other first light emitting module 11 with the light guide plate 8 interposed therebetween. That is, the pair of first light emitting modules 11 are arranged line-symmetrically with respect to the optical axis of the lighting device 1. The optical axis of the illuminating device 1 here is a normal direction with respect to the exit surface 8 c of the light guide plate 8.

  In the present embodiment, four second light emitting modules 13 are provided. That is, the remaining four incident surfaces 8a are arranged to face each incident surface 8a so that the second light emitting modules 13 correspond one-to-one. Also in the second light emitting module 13, one second light emitting module 13 is disposed to face the other second light emitting module 13 with the light guide plate 8 interposed therebetween. That is, the pair of second light emitting modules 13 are arranged line-symmetrically with respect to the optical axis of the lighting device 1.

  In the illuminating device 1, the second light emitting module 13 is arranged at a different location from the first light emitting module 11. In addition, the plurality of first light emitting modules 11 and the plurality of second light emitting modules 13 are arranged around the light guide plate 8 so that the second light emitting module 13 exists on both sides of the first light emitting module 11.

  In the present embodiment, the first light emitting module 11 and the second light emitting module 13 are modules having LEDs (Light Emitting Diodes), and have LED light sources that emit predetermined light radially.

  The first light emitting module 11 includes a base 11a and a plurality of first light sources 11b mounted on the base 11a. The second light emitting module 13 includes a base 13a and a plurality of second light sources 13b mounted on the base 13a. Each of the first light source 11b and the second light source 13b includes an LED element that emits light, and a sealing member that seals the LED element and includes a phosphor. In addition, the sealing member may seal all the light sources collectively, and it is good also as a structure which forms a sealing member in the shape of several lines along the sequence direction of the light source arranged in the line form. Each of the first light source 11b and the second light source 13b is configured to emit white light, for example.

  The bases 11a and 13a are mounting substrates for mounting each of the plurality of first light sources 11b and the plurality of second light sources 13b, and are, for example, a ceramic substrate, a resin substrate, an insulating-coated metal base substrate, or the like. . Moreover, the bases 11a and 13a are plate-shaped which has a plane which is a rectangle in front view, for example, and are fixed by being attached to the holding member 10. Although not shown, the bases 11a and 13a are formed with a power feeding unit 14 for receiving DC power for emitting light from the first light source 11b and the second light source 13b from the outside. The power feeding unit 14 is a positive electrode terminal and a negative electrode terminal.

  The first light sources 11b are mounted on the base 11a so as to be arranged in a line at equal intervals. Further, the second light sources 13b are mounted on the base 13a so as to be arranged in a line at equal intervals. Two or more rows of the first light source 11b and the second light source 13b may be arranged on the bases 11a and 13a.

  A plurality of first light sources 11 b and second light sources 13 b are provided around the light guide plate 8. Each first light source 11 b in one first light emitting module 11 is disposed to face each first light source 11 b in one first light emitting module 11 with the light guide plate 8 interposed therebetween. In addition, each second light source 13 b in one second light emitting module 13 is disposed to face each second light source 13 b in one second light emitting module 13 via the light guide plate 8.

  The first light source 11 b and the second light source 13 b irradiate the incident surface 8 a of the light guide plate 8 with light. That is, the 1st light source 11b and the 2nd light source 13b are arrange | positioned at substantially equal intervals so that each optical axis J may face the entrance plane 8a. Specifically, the first light source 11 b and the second light source 13 b are arranged to face the incident surface 8 a so that each optical axis J is substantially orthogonal to the incident surface 8 a of the light guide plate 8. That is, the light guide plate 8 is arranged in the emission direction of the first light source 11b and the second light source 13b. The optical axis J of the first light source 11 b is synonymous with the optical axis of the first light emitting module 11, and the optical axis J of the second light source 13 b is synonymous with the optical axis of the second light emitting module 13.

  At least one of the first light source 11b and the second light source 13b is disposed to face the first reflecting surface 82a through the incident surface 8a. In the present embodiment, the first light source 11b is disposed to face the first reflecting surface 82a via the incident surface 8a. Specifically, when the first light source 11b, the second light source 13b, and the light guide plate 8 are viewed in plan, the first light source 11b has the optical axis J of the first light source 11b substantially orthogonal to the first reflecting surface 82a. The second light source 13b is arranged so that the optical axis J of the second light source 13b is inclined with respect to the first reflecting surface 82a. In addition, when the 1st light source 11b, the 2nd light source 13b, and the light-guide plate 8 are planarly viewed, the 1st light source 11b is the state in which the optical axis J of the 1st light source 11b becomes incline with respect to the 1st reflective surface 82a. The second light source 13b may be arranged such that the optical axis J of the second light source 13b is substantially orthogonal to the first reflecting surface 82a. Moreover, the 1st light source 11b may be arrange | positioned facing the 2nd reflective surface 82b.

  Further, a gap is provided between the first light source 11b and the second light source 13b and the light guide plate 8 so that the first light source 11b and the second light source 13b and the light guide plate 8 do not contact each other. This is to prevent heat from the first light source 11 b and the second light source 13 b from being conducted to the light guide plate 8 and damaging the light guide plate 8.

  The amount of light when the first light source 11b is lit and the amount of light when the second light source 13b is lit are substantially the same. Further, the first light source 11b and the second light source 13b may be the same light source.

  The first light source 11b and the second light source 13b may be so-called SMD (Surface Mount Device) type LED elements. Specifically, the SMD type LED element is a package type LED element in which an LED chip (light emitting element) is mounted in a resin-molded cavity, and a phosphor-containing resin is sealed in the cavity. The first light source 11b and the second light source 13b are controlled by the control circuit 6 to perform dimming and toning. For example, a surface-mounted LED element that emits white light by a combination of a blue LED chip and a yellow phosphor-containing resin is employed as the first light source 11b and the second light source 13b.

  In addition, the 1st light source 11b and the 2nd light source 13b are not limited to such a structure, A LED chip is directly on each base 11a, 13a of the 1st light source 11b and the 2nd light source 13b. A COB (Chip On Board) type light-emitting module mounted on the board may be used. The light emitting elements included in the first light source 11b and the second light source 13b are not limited to LEDs. For example, a semiconductor light emitting element such as a semiconductor laser, or an EL such as an organic EL (Electro Luminescence) or an inorganic EL. Other solid light emitting devices such as devices may be used.

  The fixed frame 15 is an annular member that has an insertion hole and is fixed to an attachment hole formed in the construction material. The fixed frame 15 is a cover that covers a gap between the mounting hole and the lighting device 1 when the lighting device 1 is attached to the construction material. The fixed frame 15 is fixed to the first case 3 with screws. The fixed frame 15 is arranged along the inner periphery of the mounting hole of the construction material, and is fixed to the mounting hole by the mounting bracket 19. The fixed frame 15 has a hook-shaped portion that comes into contact with the construction material. The hook-shaped portion is an annular portion that protrudes outward from the fixed frame 15. In the fixed frame 15, the light emitted from the light guide plate 8 passes through the opening of the fixed frame 15.

  The material for forming the fixed frame 15 is not particularly limited. In the present embodiment, the fixed frame 15 is formed of a conductive member such as aluminum, for example.

  The packing 17 is an example of an annular seal member that seals between the flanged portion of the fixed frame 15 and the building material when the fixed frame 15 is disposed on the surface on the Z axis minus direction side of the building material. The diameter of the packing 17 is larger than the diameter of the mounting hole and smaller than the outer diameter of the fixed frame 15. The packing 17 is provided along the circumferential direction of the fixed frame 15 so as to fill a space between the fixed frame 15 and the construction material. The packing 17 seals the space between the bowl-shaped portion and the construction material over the entire circumference by, for example, a screw fastening force. Further, since the packing 17 comes into contact with the construction material by this fastening force, the rotation range of the fixed frame 15 is restricted.

  The packing 17 is formed from a material having a low moisture permeability. As a material of the packing 17, for example, a resin material such as butyl rubber can be used.

  The mounting bracket 19 is an elastic member that fixes the fixing frame 15 to a mounting hole formed in the construction material. The mounting bracket 19 is, for example, a leaf spring, but is not limited to a leaf spring, and may be fixed by a fixing member such as a screw or an adhesive, and a known method can be used. In the present embodiment, the fixing frame 15 is fixed to the mounting hole by two leaf springs. The leaf spring has a curved portion. The lighting device 1 is fixed to the construction material by sandwiching the construction material between the curved shape portion and the bowl-shaped portion of the fixed frame 15.

  The material for forming the mounting bracket 19 is not particularly limited as long as it is an elastic member. The mounting bracket 19 is made of a conductive member such as steel or aluminum. The curved portion of the mounting bracket 19 can be formed, for example, by pressing a plate-like member against a mold.

  In such an illuminating device 1, the light emitted from the first light source 11 b and the second light source 13 b enters from the incident surface 8 a of the light guide plate 8 and is guided in the light guide plate 8.

  A case where the first light source 11b and the second light source 13b are selectively turned on will be described with reference to FIG. FIG. 6 is an image diagram when the first light emitting module 11 and the second light emitting module 13 of the lighting apparatus 1 according to Embodiment 1 are selectively turned on. FIG. 6A is an image diagram when the first light emitting module 11 of the lighting device 1 is turned on. FIG. 6B is an image diagram when the second light emitting module 13 of the lighting device 1 is turned on. FIG. 6C is an image diagram when the first light emitting module 11 and the second light emitting module 13 of the lighting device 1 are turned on.

  As shown in FIG. 6A, the light emitted from the first light source 11b is incident on the optical structure 81 of the light diffusion surface 8b when the first light source 11b, the second light source 13b, and the light guide plate 8 are viewed in plan. Incident in a state substantially orthogonal to the first reflecting surface 82a. This light is reflected by the first reflecting surface 82a, enters the exit surface 8c, and exits directly from the exit surface 8c. For this reason, when the 1st light source 11b lights, the light-guide plate 8 radiate | emits the light of the narrow 1st light distribution angle from the output surface 8c. The first light distribution angle is a ½ beam angle.

  6B, the light emitted from the second light source 13b is the optical structure of the light diffusion surface 8b when the first light source 11b, the second light source 13b, and the light guide plate 8 are viewed in plan. The light enters the first reflecting surface 82a of 81 in an inclined state. This light is reflected by the first reflecting surface 82a, enters the exit surface 8c, and exits from the exit surface 8c directly below and around it. For this reason, when the 2nd light source 13b lights, the light-guide plate 8 radiate | emits the light of the wide 2nd light distribution angle larger than a 1st light distribution angle from the output surface 8c. The second light distribution angle is a ½ beam angle.

  Further, as shown in FIG. 6C, when both the first light source 11b and the second light source 13b are turned on, the second light source 13b can illuminate a wide area, and the first light source 11b The narrow area to be irradiated can be illuminated more brightly.

  Thus, in this illuminating device 1, it is possible to illuminate a narrow area or illuminate a wide area only by selectively changing lighting of the first light source 11b and the second light source 13b.

[Analysis result]
Next, the result of the simulation analysis about the light distribution by the light guide plate 8 will be described.

  FIG. 7 is a perspective view showing the optical structure 85 used in the simulation analysis. FIG. 8 is a diagram showing a light distribution curve when the optical structure 85 of FIG. 7 is used. FIG. 9 is a diagram showing a light distribution curve of the light guide plate 8 using the optical structure 85 of FIG. FIG. 10 is a diagram showing a light distribution curve when the optical structure 85 of FIG. 7 is used. FIG. 11 is a diagram showing a light distribution curve when the optical structure 85 of FIG. 7 is used.

  In this analysis, the light guide plate 8 formed with the optical structure 85 shown in FIG. 7 was used instead of the optical structure 81 according to the present embodiment. The optical structure 85 has a trapezoidal cross-sectional shape substantially parallel to the optical axis of the first light emitting module 11, and a part of the light diffusion surface 8b linearly along the X-axis direction perpendicular to the cross-section. A concave shape is formed by cutting out. The optical structure 85 has a substantially rectangular columnar concave shape, and the longitudinal direction thereof is substantially orthogonal to the optical axis J of the first light source 11b when the light guide plate 8 is viewed from the Z axis plus direction side.

  In this analysis, the other points are the same conditions as in FIG. 4 according to the present embodiment, and the description of the same conditions is omitted unless otherwise specified.

  First, the following simulation analysis was performed.

  In this simulation analysis, the shape of the light guide plate 8 in plan view is a hexagonal shape, the size of the light guide plate 8 is 80 × 60 cm, and the area of the light diffusion surface 8b of the light guide plate 8 on which the optical structure 85 is formed is 57. 5 × 57.5 mm, and the size of each of the first light emitting module 11 and the second light emitting module 13 was 20 × 2.6 mm. In this simulation analysis, a light guide plate is formed using a pair of first light emitting modules 11 arranged to face each other via the light guide plate 8 and a pair of second light emitting modules 13 arranged to face each other via the light guide plate 8. Light was incident on 8. That is, in this simulation analysis, the two first light emitting modules 11 and the two second light emitting elements are arranged on the six incident surfaces 8a of the light guide plate 8 without arranging the second light emitting modules 13 to face the two incident surfaces 8a. Module 13 was used.

  (A) of FIG. 8 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 27.5 °. The 1/2 beam angle here is the first light distribution angle.

  FIG. 8B is a diagram showing a light distribution curve when the second light source 13b is turned on. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 84.7 °. The 1/2 beam angle here is the second light distribution angle.

  Next, the following simulation analysis was performed.

  In this simulation analysis, the shape of the light guide plate 8 in plan view is hexagonal, the size of the light guide plate 8 is 80 × 60 cm, and the area of the light diffusion surface 8b of the light guide plate 8 on which the optical structure 85 is formed is 40. The size of each of the first light emitting module 11 and the second light emitting module 13 was set to 20 × 2.6 mm. Also in this simulation analysis, a light guide plate is formed by using a pair of first light emitting modules 11 arranged to face each other via the light guide plate 8 and a pair of second light emitting modules 13 arranged to face each other via the light guide plate 8. Light was incident on 8. That is, even in this simulation analysis, the two first light emitting modules 11 and the two second light emitting elements are arranged in the six incident surfaces 8a of the light guide plate 8 without arranging the second light emitting modules 13 to face the two incident surfaces 8a. Module 13 was used.

  (A) of FIG. 9 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 25.9 °.

  FIG. 9B is a diagram showing a light distribution curve when the second light source 13b is turned on. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 91.3 °.

  From these results, it can be seen that when the first light source 11b is turned on, the ½ beam angle is small, and when the second light source 13b is lit, the ½ beam angle is large. That is, in this illuminating device 1, the light distribution angle is smaller when the first light source 11b is lit than when the second light source 13b is lit. On the other hand, in this illuminating device 1, the light distribution angle is larger when the second light source 13b is lit than when the first light source 11b is lit. For this reason, in this illuminating device 1, light distribution control can be performed by selectively lighting the first light source 11b and the second light source 13b.

  Next, the following simulation analysis was performed.

  In this simulation analysis, the shape of the light guide plate 8 in plan view is an octagonal shape, the size of the light guide plate 8 is 80 × 60 cm, and the area of the light diffusion surface 8b of the light guide plate 8 on which the optical structure 85 is formed is 57. 5 × 57.5 mm, and the size of each of the first light emitting module 11 and the second light emitting module 13 was 20 × 2.6 mm. Further, in this simulation analysis, a pair of first light emitting modules 11 arranged opposite to each other via the light guide plate 8 and two pairs of second light emitting modules 13 arranged opposite to each other via the light guide plate 8 are used. Light was incident on the light plate 8. That is, in this simulation analysis, two first light emitting modules 11 and four second light emitting elements are arranged on the eight incident surfaces 8a of the light guide plate 8 without arranging the second light emitting modules 13 to face the two incident surfaces 8a. Using the module 13, the second light emitting module 13 was disposed on both sides of the first light emitting module 11.

  (A) of FIG. 10 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 29.0 °.

  FIG. 10B is a diagram showing a light distribution curve when the second light source 13b is turned on. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the ½ beam angle was 71.7 °.

  Next, the following simulation analysis was performed.

  In this simulation analysis, the shape of the light guide plate 8 in plan view is an octagonal shape, the size of the light guide plate 8 is 80 × 60 cm, and the area of the light diffusion surface 8b of the light guide plate 8 on which the optical structure 85 is formed is 40. The size of each of the first light emitting module 11 and the second light emitting module 13 was set to 20 × 2.6 mm. In this simulation analysis, a light guide plate is formed using a pair of first light emitting modules 11 arranged to face each other via the light guide plate 8 and a pair of second light emitting modules 13 arranged to face each other via the light guide plate 8. Light was incident on 8. That is, in this simulation analysis, two first light emitting modules 11 and two second light emitting elements are arranged on the eight incident surfaces 8a of the light guide plate 8 without arranging the second light emitting modules 13 to face the four incident surfaces 8a. Module 13 was used.

  (A) of FIG. 11 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. In this case, the 1/2 beam angle was 30.1 °. FIG. 11B is a diagram showing a light distribution curve when the second light source 13b is turned on. 11 (a) and 11 (b), the solid line shows a light distribution curve when a plane defined by the X-axis direction and the Z-axis direction is seen, and the broken line shows the Y-axis direction and the Z-axis direction. It is a light distribution curve when the plane defined by is seen. In this case, the 1/2 beam angle was 70.9 °.

  Next, the following simulation analysis was performed.

  In this simulation analysis, the shape of the light guide plate 8 in plan view is rectangular, the size of the light guide plate 8 is 564 × 564 cm, and the area of the light diffusion surface 8b of the light guide plate 8 on which the optical structure 85 is formed is 560. The size of each of the first light emitting module 11 and the second light emitting module 13 was 538 × 2.6 mm. In this simulation analysis, a light guide plate is formed using a pair of first light emitting modules 11 arranged to face each other via the light guide plate 8 and a pair of second light emitting modules 13 arranged to face each other via the light guide plate 8. Light was incident on 8. That is, in the simulation analysis, two first light emitting modules 11 and two second light emitting modules 13 were used.

  (C) of FIG. 11 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. In this case, the 1/2 beam angle was 30.1 °. FIG. 11D is a diagram showing a light distribution curve when the second light source 13b is turned on. In FIG. 11C and FIG. 11D, the solid line shows the light distribution curve when viewing the plane defined by the X-axis direction and the Z-axis direction, and the broken line shows the Y-axis direction and the Z-axis direction. It is a light distribution curve when the plane defined by is seen. In this case, the 1/2 beam angle was 70.9 °.

[Function and effect]
Next, the effect of the illuminating device 1 in this Embodiment is demonstrated.

  As described above, the lighting device 1 according to the present embodiment includes the first light source 11b, the second light source 13b disposed at a different location from the first light source 11b, the incident surface 8a on which light is incident, and the incident surface. The light guide plate 8 intersects with the light diffuser 8a and has a light diffusion surface 8b on which light is diffused and a light output surface 8c that is opposite to the light diffusion surface 8b and emits light. The light diffusing surface 8b includes a plurality of optical structures 81 having a first reflecting surface 82a that reflects light and having a convex shape or a concave shape. Furthermore, at least one of the first light source 11b and the second light source 13b is disposed to face the first reflecting surface 82a via the incident surface 8a. The light guide plate 8 emits light having the first light distribution angle from the emission surface 8c when the first light source 11b is turned on, and is larger than the first light distribution angle when the second light source 13b is turned on. Light having the second light distribution angle is emitted from the emission surface 8c.

  According to this, at least one of the plurality of first light sources 11b and the plurality of second light sources 13b includes the first light diffusing surface 8b on the optical axis J of the first light source 11b and the optical axis J of the second light source 13b. The reflective surface 82a is disposed opposite to the reflective surface 82a. That is, in this illuminating device 1, since it is the structure by which the some 1st light source 11b and the some 2nd light source 13b are arrange | positioned around the light-guide plate 8 in which the some convex or concave optical structure 81 was formed. The structure is simple.

  Further, in the illumination device 1 having such a configuration, when the first light source 11b is turned on, the light from the first light source 11b is reflected by the optical structure 81 toward the emission surface 8c, and the first light distribution from the emission surface 8c. Corner light is emitted from the exit surface 8c to illuminate a narrow area. When the second light source 13b is lit, the light from the second light source 13b is reflected by the optical structure 81 and travels toward the emission surface 8c, and light having a second light distribution angle is emitted from the emission surface 8c from the emission surface 8c. , Lighting a wide area. For this reason, the light distribution of the light emitted from the illumination device 1 can be controlled by selectively turning on the first light source 11b and the second light source 13b.

  Therefore, in this illuminating device 1, light distribution control can be performed with a simple configuration.

  In particular, in such a lighting device 1, by switching the lighting state to the first light source 11b or the second light source 13b, it is possible to perform wide-area illumination and narrow-area illumination in the space where the user exists, and as a result , Lighting comfort can be increased. In addition, even when switching between the wide area illumination and the narrow area illumination, the entire light exit surface 8c of the light guide plate 8 is in a light emitting state, so that the atmosphere of the construction material to which the illumination device 1 is attached is not changed significantly. In terms of point, the comfort of the lighting environment can be enhanced.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, the optical structure 81 is an elongate shape and is a polyhedral structure which becomes a substantially isosceles triangle in the cross section of a Y-axis direction.

  According to this, since the optical structure 81 is a polyhedral structure having a substantially isosceles triangle in the cross section in the Y-axis direction, the first light source 11b and the second light source 13b are emitted from the first reflecting surface 82a of the optical structure 81. Light can be reflected toward the exit surface 8c. For example, the first light distribution angle and the second light distribution angle can be adjusted only by appropriately changing the inclination angle, shape, etc. of the optical structure 81. The light distribution control can be performed.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, when the 1st light source 11b, the 2nd light source 13b, and the light-guide plate 8 are planarly viewed, as for the 1st light source 11b, the optical axis J of the 1st light source 11b is 1st. The second light source 13b is arranged so that the optical axis J of the second light source 13b is inclined with respect to the first reflecting surface 82a.

  According to this, the first light source 11b, the second light source 13b, and the light guide plate 8 are viewed in plan so that the optical axis J of the first light source 11b is substantially orthogonal to the optical structure 81 when viewed in plan. Since the light source 11b is disposed on the outer peripheral side of the light guide plate 8, the light emitted from the first light source 11b guides the light guide plate 8 and is reflected by the first reflecting surface 82a of the optical structure 81 to be substantially Z-axis minus. Head in the direction. For this reason, when the 1st light source 11b lights, the light of the 1st light distribution angle which goes to a substantially Z-axis minus direction from the output surface 8c of the light-guide plate 8 is radiate | emitted.

  On the other hand, since the second light source 13b is disposed on the outer peripheral side of the light guide plate 8 so that the optical axis J of the second light source 13b is inclined with respect to the optical structure 81, the light emitted from the second light source 13b. Guides the light guide plate 8 and is reflected by the first reflecting surface 82a or the second reflecting surface 82b of the optical structure 81 and travels in the direction inclined from the Z-axis minus direction to the X-axis direction or the Y-axis direction. For this reason, when the 2nd light source 13b lights, the light of the 2nd light distribution angle larger than a 1st light distribution angle is radiate | emitted from the output surface 8c of the light-guide plate 8. FIG.

  For this reason, in this illuminating device 1, light distribution control can be performed by selectively lighting the 1st light source 11b and the 2nd light source 13b.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, the light-guide plate 8 has comprised even-numbered substantially polygonal shape by planar view. A plurality of first light sources 11 b are provided around the light guide plate 8, and are arranged to face each other with the light guide plate 8 interposed therebetween. A plurality of second light sources 13 b are provided around the light guide plate 8, and are arranged to face each other via the light guide plate 8.

  According to this, as in the present embodiment, two first light sources 11b and four second light sources 13b are arranged around the light guide plate 8, and second light sources 13b are arranged on both sides of the first light source 11b. Has been. That is, the light distribution angle of the light emitted from the emission surface 8c when the first light source 11b is lit is smaller than the light distribution angle of the light emitted from the emission surface 8c when the second light source 13b is lit, so A larger number of second light sources 13b that illuminate a wider area than the first light sources 11b that illuminate the area are arranged. For this reason, the brightness that illuminates the surroundings when the first light source 11b is turned on and the brightness that illuminates the surroundings when the second light source 13b is turned on can be made equal. In other words, when the first light source 11b or the second light source 13b is turned on, it is difficult for a large difference to occur in the brightness of the light emitted from the lighting device 1.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, the light quantity at the time of lighting of the 1st light source 11b and the light quantity at the time of lighting of the 2nd light source 13b are substantially the same.

  If the output of the first light source 11b and the output of the second light source 13b are different, two power supply units 7 for supplying power to the first light source 11b and the second light source 13b are required. If the outputs of the first light source 11b and the second light source 13b are made substantially the same, desired light distribution control can be performed by one power source unit 7. For this reason, the increase in the manufacturing cost of the illuminating device 1 can be suppressed.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, the some optical structure 81 is regularly arrange | positioned at the light-diffusion surface 8b.

  According to this, since substantially uniform light can be emitted from the emission surface 8c, luminance spots and suppressed light can be emitted from the emission surface 8c.

(Modification of Embodiment 1)
[Constitution]
The structure of the illuminating device which concerns on this modification is demonstrated using FIG.

  FIG. 12 is a diagram showing an optical structure 181 in the illumination device according to the modification of the first embodiment. FIG. 12A is a partially enlarged perspective view showing the light diffusion surface 108b of the light guide plate 108 of the lighting device. FIG. 12B is a plan view showing the optical structure 181 in the light guide plate 108 of the lighting device. FIG. 12C is a cross-sectional view showing the optical structure 181 of the light guide plate 108 taken along the line VIIIc-VIIIc in FIG. FIG. 12D is a cross-sectional view showing the optical structure 181 of the light guide plate 108 taken along the line VIIId-VIIId in FIG.

  This modification is different from the first embodiment in that the shape of the optical structure 181 is different. In addition, the lighting device of the present modification is the same as that of the first embodiment unless otherwise specified, and the same components are denoted by the same reference numerals and detailed description thereof is omitted.

  In this modification, the optical structure 181 has a substantially isosceles triangular cross section substantially parallel to the optical axis of the first light emitting module 11, and linearly extends along a direction perpendicular to the cross section. Thus, a concave shape is formed by cutting out a part of the light diffusion surface 108b. That is, the optical structure 181 has a spindle shape that is a substantially isosceles triangle in the cross section in the Y-axis direction.

  The optical structure 181 has a pair of reflecting surfaces 181a extending in the longitudinal direction and receiving light. Since the optical structure 181 has a spindle shape, the reflecting surface 181a is a curved surface. The at least one of the first light source 11b and the second light source 13b referred to in this modification is opposed to the reflecting surface 181a via the incident surface 8a. The longitudinal direction of the optical structure 181 and the first light source 11b and the second light source 13b It means that at least one optical axis J is substantially orthogonal.

  The optical structure 181 is not limited to the concave shape formed by cutting out the light diffusion surface 108b of the light guide plate 108, and is formed so as to protrude from the light diffusion surface 108b of the light guide plate 108 to the Z axis plus direction side. May be.

[Function and effect]
The effect of the illumination device in this modification will be described.

  As described above, in the illumination device according to this modification, the optical structure 181 has a spindle shape that is a substantially isosceles triangle in the cross section in the Y-axis direction.

  According to this configuration, since the optical structure 181 has a spindle shape, the light emitted from the first light source 11b and the second light source 13b can be reflected toward the emission surface 8c. For example, the first light distribution angle and the second light distribution angle can be adjusted by simply changing the inclination angle, shape, and the like of the optical structure 181. Therefore, if the light guide plate 108 is used in a lighting device, a desired light distribution angle can be obtained. Light distribution control can be performed.

  The other operational effects in the present modification also have the same operational effects as in the first embodiment.

(Embodiment 2)
[Constitution]
The structure of the lighting device according to this embodiment will be described with reference to FIG.

  FIG. 13 is a plan view showing the light guide plate 208, the first light emitting module 11, and the second light emitting module 13 in the lighting apparatus according to Embodiment 2. FIG.

  The present embodiment is different from the first embodiment in that the first optical structure 281 and the second optical structure 282 having different sizes exist on the light diffusion surface 208b. The lighting device of the present embodiment is the same as that of the first embodiment and the like unless otherwise specified, and the same components are denoted by the same reference numerals and detailed description thereof is omitted.

  As shown in FIG. 13, in the present embodiment, a first optical structure 281 and a second optical structure 282 are formed on the light diffusion surface 208 b of the light guide plate 208. The plurality of optical structures 282 includes a plurality of first optical structures 281 and a second optical structure 282.

  The first optical structure 281 has the same configuration as the optical structure of the first embodiment. The second optical structure 282 has a shape similar to the first optical structure 281 in plan view and is larger than the first optical structure 281. The second optical structure 282 is located on the central diffusion surface E1 of the light diffusion surface 208b. In addition, the 1st optical structure 281 and the 2nd optical structure 282 are not limited only to the completely same shape.

  The light diffusion surface 208b has a central diffusion surface E1 and a peripheral diffusion surface E2.

  The central diffusion surface E1 is located at the central portion of the light diffusion surface 208b. A second optical structure 282 is disposed on the central diffusion surface E1. In the present embodiment, one second optical structure 282 is formed on the central diffusion surface E1. Note that the second optical structure 282 may be disposed at a plurality of locations on the central diffusion surface E1.

  The peripheral diffusion surface E2 is located so as to surround the periphery of the central diffusion surface E1. In other words, the peripheral diffusion surface E2 is in contact with all outer edges of the light diffusion surface 208b. A plurality of first optical structures 281 are regularly arranged on the central diffusion surface E1.

[Analysis result]
Next, the result of simulation analysis for light distribution by the light guide plate 208 will be described.

  FIG. 14 is a diagram showing a light distribution curve when the optical structure 85 of FIG. 7 is used.

  In this analysis, a light guide plate 208 having a substantially hexagonal shape in plan view was used. Further, instead of the optical structure 281 formed on the light guide plate 208 according to the present embodiment, a light guide plate 208 having an optical structure similar to the optical structure 85 shown in FIG. 7 is used. The optical structure 282 has the same shape and the same size as the optical structure 85 shown in FIG. The optical structure 85 has a trapezoidal cross-sectional shape substantially parallel to the optical axis of the first light emitting module 11, and a part of the light diffusion surface 208b linearly along the X-axis direction perpendicular to the cross-section. A concave shape is formed by cutting out. The optical structure 85 has a substantially rectangular columnar concave shape, and the longitudinal direction of the optical structure 85 is substantially orthogonal to the optical axis J of the first light source 11b when the light guide plate 208 is viewed from the Z axis plus direction side.

  In this analysis, when the first light source 11b, the second light source 13b, and the light guide plate 208 are viewed in plan, the optical axis J of the first light source 11b is reflected by each of the first optical structure 281 and the second optical structure 282. The optical axis J of the second light source 13b is arranged so as to be substantially orthogonal to the reflecting surface of the first optical structure 281. In this analysis, the first light source 11b is arranged so that the angle between the optical axis J of the first light source 11b and the longitudinal direction of the first optical structure 281 and the second optical structure 282 is about 30 °.

  In this analysis, the other points are the same conditions as in FIG. 13 according to the present embodiment, and the description of the same conditions is omitted unless otherwise specified.

  First, the following simulation analysis was performed.

  In this simulation analysis, a pair of first light emitting modules 11 disposed to face each other via the light guide plate 208 and a pair of second light emitting modules 13 disposed to face each other via the light guide plate 208 are used. Light was incident. The optical axis of the first light emitting module 11 and the optical axis of the second light emitting module 13 are substantially orthogonal. That is, in this simulation analysis, the two first light emitting modules 11 and the two second light emitting elements are arranged on the six incident surfaces 8a of the light guide plate 208 without arranging the second light emitting modules 13 to face the two incident surfaces 8a. Module 13 was used.

  (A) of FIG. 14 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 68.0 °.

  FIG. 14B is a diagram showing a light distribution curve when the second light source 13b is turned on. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 21.2 °.

[Function and effect]
Next, the function and effect of the lighting device in this embodiment will be described.

  As described above, in the illumination device according to the present embodiment, the light diffusing surface 8b includes the central diffusing surface E1 located in the central portion and the peripheral diffusing surface E2 located so as to surround the central diffusing surface E1. Have. The plurality of optical structures include a plurality of first optical structures 281 and a second optical structure 282 that is larger than the first optical structure 281. Furthermore, at least the second optical structure 282 is disposed on the central diffusion surface E1. The first optical structures 281 are regularly arranged on the peripheral diffusion surface E2.

  According to this, since the second optical structure 282 larger than the first optical structure 281 is arranged on the central diffusing surface E1, it is possible to illuminate a narrow area when the first light source 11b is turned on. When the light source 13b is turned on, a wider area than the first light source 11b can be illuminated. Further, as in the simulation analysis, when the first light source 11b, the second light source 13b, and the light guide plate 208 are viewed in plan, the first light source 11b is inclined with respect to the reflection surface of the first optical structure 281. In the case of being arranged, a narrow area can be illuminated when the second light source 13b is turned on, and a wider area than the first light source 11b can be illuminated when the first light source 11b is turned on. For these reasons, when the first light source 11b or the second light source 13b is turned on, the light emitted from the illumination device 1 can be controlled.

  Other effects in the present embodiment are similar to those in the first embodiment.

(Modification of Embodiment 2)
[Constitution]
The structure of the illuminating device which concerns on this modification is demonstrated using FIG.

  FIG. 15 is a plan view showing the light guide plate 308, the first light emitting module 11, and the second light emitting module 13 in the lighting apparatus according to the modification of the second embodiment.

  In this modification, the Y-axis direction of the second optical structure 382 existing on the central diffusion surface E1 is different from the Y-axis direction of the first optical structure 381 existing on the peripheral diffusion surface E2. This is different from the second embodiment. Further, the lighting device of the present modification is the same as that of the second embodiment unless otherwise specified, and the same components are denoted by the same reference numerals, and detailed description thereof is omitted.

  As shown in FIG. 15, a plurality of first optical structures 381 and second optical structures 382 are arranged on the central diffusion surface E1 of the light guide plate 308. In the present modification, one second optical structure 382 is formed on the central diffusion surface E1. Note that the second optical structure 382 may be disposed at a plurality of locations on the central diffusion surface E1. The first optical structure 381 and the second optical structure 382 of the central diffusion surface E1 are arranged so that the longitudinal direction is substantially parallel to the Y-axis direction. Note that only the second optical structure 382 may be provided on the central diffusion surface E1.

  A plurality of first optical structures 381 are arranged on the peripheral diffusion surface E2. The first optical structure 381 of the peripheral diffusion surface E2 is disposed so that the longitudinal direction is substantially parallel to the X-axis direction.

[Analysis result]
Next, the result of simulation analysis for light distribution by the light guide plate 308 will be described.

  FIG. 16 is a diagram showing a light distribution curve when the optical structure 85 of FIG. 7 is used.

  In this analysis, the light diffusing surface 308b of the light guide plate 308 is arranged in a substantially octagonal shape as a whole in a plan view. In this analysis, a light guide plate 308 having an optical structure similar to the optical structure 85 shown in FIG. 7 is used instead of the optical structure 381 formed on the light guide plate 308 according to this modification. Further, the optical structure 382 has the same shape and the same size as the optical structure 85 shown in FIG. The optical structure 85 has a trapezoidal cross-sectional shape substantially parallel to the optical axis of the first light emitting module 11, and a part of the light diffusion surface 308b linearly along the X-axis direction perpendicular to the cross-section. A concave shape is formed by cutting out. The optical structure 85 is a substantially quadrangular prism-shaped concave shape, and the longitudinal direction of the optical structure 85 is substantially orthogonal to the optical axis J of the first light source 11b when the light guide plate 308 is viewed from the Z axis plus direction side.

  First, the following simulation analysis was performed.

  In this simulation analysis, a pair of first light emitting modules 11 arranged to face each other via the light guide plate 308 and a pair of second light emitting modules 13 arranged to face each other via the light guide plate 308 are used to form a light guide plate 308. Light was incident. That is, in this simulation analysis, two first light emitting modules 11 and two second light emitting elements are arranged on the eight incident surfaces 8a of the light guide plate 308 without arranging the second light emitting modules 13 to face the four incident surfaces 8a. Module 13 was used. The first light emitting module 11 is provided with one first light source 11b, and the second light emitting module 13 is provided with four second light sources 13b.

  (A) of FIG. 16 is a figure which shows the light distribution curve at the time of lighting the 1st light source 11b. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 26.1 °.

  FIG. 16B is a diagram showing a light distribution curve when the second light source 13b is turned on. The solid line shows the light distribution curve when viewing the plane defined by the X axis direction and the Z axis direction, and the broken line is the light distribution curve when viewing the plane defined by the Y axis direction and the Z axis direction. is there. In this case, the 1/2 beam angle was 58.7 °.

  The other operational effects in the present modification also have the same operational effects as in the first embodiment.

(Other variations)
As described above, the present invention has been described based on the first and second embodiments and the first and second modifications. However, the present invention includes the first and second embodiments and the first and second modifications. It is not limited to.

  For example, in the first and second embodiments and the modifications of the first and second embodiments, the optical structures may be arranged radially with reference to the center of the light guide plate. In the modification of the second embodiment in this case, the optical structure may be arranged radially on the light diffusion surface so that the radiation direction from the center of the light diffusion surface and the longitudinal direction of the optical structure are orthogonal to each other.

  Moreover, in the said Embodiment 1, 2 and the modification of Embodiment 1, 2, you may divide | segment into three or more area | regions which become fan shape on the basis of the center of a light-guide plate. For example, when divided into four areas having a fan shape, the longitudinal directions of the optical structures of the two areas that are symmetric with respect to the center of the light guide plate are substantially orthogonal to the longitudinal directions of the optical structures of the remaining two areas. As such, the optical structures may be arranged.

  Moreover, in the said Embodiment 1, 2 and the modification of Embodiment 1, 2, the polyhedron structure should just be a dihedron or more, and is not limited to the number of surfaces. Further, the surface forming the optical structure or the exit surface is not necessarily a flat surface, and may be a curved surface.

  In addition, Embodiments 1 and 2 and Embodiments 1 and 2 within a range that does not depart from the gist of the present invention, or forms obtained by making various modifications conceivable by those skilled in the art to the modifications of Embodiments 1 and 2 And the form implement | achieved by combining arbitrarily the component and function in the modification of Embodiment 1, 2 is also contained in this invention.

DESCRIPTION OF SYMBOLS 1 Illuminating device 8,108,208,308 Light-guide plate 8a Incident surface 8b, 108b, 208b, 308b Light diffusion surface 8c Output surface 82a 1st reflective surface (reflective surface)
82b Second reflection surface (reflection surface)
181a Reflecting surface 11b First light source 13b Second light source 81, 85, 181 Optical structure 281, 381 First optical structure (optical structure)
282, 382 Second optical structure (optical structure)
E1 Central diffusion surface E2 Peripheral diffusion surface

Claims (8)

A first light source;
A second light source disposed at a different location from the first light source;
A light guide plate having an incident surface on which light is incident, a light diffusing surface that intersects the incident surface and diffuses light, and an exit surface that is opposite to the light diffusing surface and emits light And
The light diffusing surface has a reflecting surface that reflects light, and a plurality of optical structures that are convex or concave are formed,
At least one of the first light source and the second light source is disposed to face the reflecting surface through the incident surface,
The light guide plate is
When the first light source is turned on, light having a first light distribution angle is emitted from the emission surface,
An illumination device that emits light having a second light distribution angle larger than the first light distribution angle from the emission surface when the second light source is turned on. The illuminating device according to claim 1, wherein the optical structure is a polyhedral structure that is long and has a substantially isosceles triangle in a cross-section in the lateral direction. The illuminating device according to claim 1, wherein the optical structure has a spindle shape that is a substantially isosceles triangle in a cross section in a short direction. When the first light source, the second light source and the light guide plate are viewed in plan view,
The first light source is arranged so that the optical axis of the first light source is substantially orthogonal to the reflecting surface,
The lighting device according to any one of claims 1 to 3, wherein the second light source is disposed such that an optical axis of the second light source is inclined with respect to the reflecting surface. The light guide plate has an even number of substantially polygonal shapes in plan view,
A plurality of the first light sources are provided around the light guide plate and are arranged to face each other through the light guide plate.
The lighting device according to any one of claims 1 to 4, wherein a plurality of the second light sources are provided around the light guide plate, and are arranged to face each other via the light guide plate. The lighting device according to any one of claims 1 to 5, wherein a light amount when the first light source is turned on and a light amount when the second light source is turned on are substantially the same. The illumination device according to any one of claims 1 to 6, wherein the plurality of optical structures are regularly arranged on the light diffusion surface. The light diffusing surface has a central diffusing surface located in a central portion and a peripheral diffusing surface located so as to surround the central diffusing surface.
The plurality of optical structures have a plurality of first optical structures and a second optical structure larger than the first optical structures;
At least the second optical structure is disposed on the central diffusion surface;
The lighting device according to claim 1, wherein the first optical structure is regularly arranged on the peripheral diffusion surface.

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