JP2018056000A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can inhibit a luminance spot at the time of lighting the lighting device while suppressing an increase in size of the lighting device.SOLUTION: A lighting device 1 includes: a light guide plate 7 having a first surface 71 for diffusing light to be guided and a second surface 72 for diffusing less light to be guided than that of the first surface 71; a first light source 41 for radiating light toward a side of the first surface 71 from a side of the second surface 72; and a second light source 51 for radiating light to the second surface 72. The first light source 41 has an optical axis X1 that intersects or three-dimensionally intersects with an optical axis X1 of the second light source 51 in the light guide plate 7.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an illumination device using a light guide plate that emits guided light.

  Conventionally, an LED illumination unit (an example of an illumination device) including a light guide plate having a side surface and an LED (an example of a first light-emitting unit) provided at a position facing the side surface of the light guide plate has been disclosed (for example, an example of an illumination device). Patent Document 1).

  In this LED illumination unit, the light guide plate irradiates light incident in the X direction in the Y direction orthogonal to the X direction.

Registered Utility Model No. 3152140

  However, in the conventional illumination device, a diffusion plate is used to emit light incident in the X direction in the Y direction. However, it is difficult to irradiate light near the first light emitting unit (Y direction). For this reason, in the illuminating device, the vicinity immediately below the first light-emitting portion becomes dark, and when the illuminating device is viewed, luminance spots are generated and the appearance is impaired. Therefore, a new light emitting unit may be provided so as not to cause luminance spots, but this increases the size of the lighting device.

  Then, an object of this invention is to provide the illuminating device which can suppress a brightness spot at the time of lighting of an illuminating device, suppressing the enlargement of an illuminating device.

  In order to achieve the above object, an illumination device according to one embodiment of the present invention includes a first region that diffuses light to be guided and a second region that does not diffuse light to be guided than the first region. An optical plate; a first light source that irradiates light from the second region side toward the first region side; and a second light source that irradiates light to the second region, and an optical axis of the first light source is The optical axis of the second light source intersects or three-dimensionally intersects within the light guide plate.

  ADVANTAGE OF THE INVENTION According to this invention, a brightness spot can be suppressed at the time of lighting of an illuminating device, suppressing the enlargement of an illuminating device.

1 is a perspective view showing a lighting device according to Embodiment 1. FIG. It is a partial expanded sectional view which shows the illuminating device which concerns on Embodiment 1 in the AA line of FIG. 2 is an enlarged cross-sectional view showing the lighting apparatus according to Embodiment 1. FIG. 6 is an explanatory diagram showing light distribution of a light source in the illumination device according to Embodiment 1. FIG. FIG. 6 is an explanatory diagram showing light distribution of a light source of a first light emitting unit in the lighting apparatus according to Embodiment 1. It is explanatory drawing which shows the light distribution of the light source in the illuminating device which concerns on a comparative example. FIG. 10 is a partial enlarged cross-sectional view showing a lighting device according to Modification 1 of Embodiment 1. FIG. 10 is a partial enlarged cross-sectional view showing a lighting device according to a second modification of the first embodiment. FIG. 11 is an explanatory diagram showing light distribution of a light source of a first light emitting unit in an illumination apparatus according to Modification 3 of Embodiment 1. FIG. 6 is a partial enlarged cross-sectional view showing a lighting device according to Embodiment 2.

  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. The same applies to the description of “near **”.

  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.

  Hereinafter, a lighting device according to an embodiment of the present invention will be described.

(Embodiment 1)
[Constitution]
First, the structure of the illuminating device 1 which concerns on this Embodiment is demonstrated using FIGS. 1-3.

  FIG. 1 is a perspective view showing a lighting apparatus 1 according to Embodiment 1. FIG. FIG. 2 is a partially enlarged cross-sectional view showing lighting apparatus 1 according to Embodiment 1 taken along line AA in FIG. FIG. 3 is an enlarged cross-sectional view showing the lighting apparatus 1 according to the first embodiment.

  In FIG. 1, in the lighting device 1, the direction in which the first light sources 41 are arranged is defined as the X-axis direction, the direction in which the light guide plates 7 are arranged is defined as the Y-axis direction, and the vertical direction is defined as the Z-axis direction. In this embodiment, the X axis plus direction is the right direction, the X axis minus direction is the left direction, the Y axis plus direction is the front direction, the Y axis minus direction is the rear direction, and the Z axis plus direction is the upward direction. , The Z-axis minus direction is the downward direction. 2 are displayed in correspondence with the directions shown in FIG. 1. In addition, in FIG. 1, since an up-down direction, a left-right direction, and the front-back direction change with usage modes, it is not limited to this. The same applies to the subsequent drawings.

  As illustrated in FIG. 1, the lighting device 1 is light guide plate illumination using an edge light system, and is disposed, for example, on a wiring device (hook ceiling) installed on a wall or ceiling in a facility. In the present embodiment, the lighting device 1 is provided in a state of being electrically connected to the ceiling ceiling ceiling. When the illumination device 1 is viewed in plan (when viewed from the lower side to the upper side of the illumination device 1), the two light guide plates 7 have an appearance as if the wings are spread in the front-rear and left-right directions.

  As illustrated in FIG. 2, the lighting device 1 includes a housing 2, a plurality of first light emitting units 4, a plurality of second light emitting units 5, a plurality of light guide plates 7, a first support unit 21, and 2. Two second support parts 22, a cover part 8, and a power supply part 9 are provided.

  The casing 2 is a bottomed box that is long in the left-right direction and has an opening formed below the casing 2. The housing 2 houses a plurality of first light emitting units 4, a plurality of second light emitting units 5, a power supply unit 9, and the like. The housing 2 supports the front and rear light guide plates 7.

  In the present embodiment, the first light emitting unit 4 has a plate shape elongated in the left-right direction. In the present embodiment, the two first light emitting units 4 are fixed to the housing 2. The 1st light emission part 4 is arrange | positioned so that the optical axis X1 may radiate | emit in a substantially horizontal direction. Specifically, the optical axis X1 of one first light emitting unit 4 is directed forward, and the optical axis X1 of the other first light emitting unit 4 is directed backward. That is, the two first light emitting units 4 are provided symmetrically in the front-rear direction.

  One (front) first light emitting unit 4 is provided on the rear edge side of the light guide plate 7 provided on the front side, and the optical axis X1 is incident on the incident surface 73 of the light guide plate 7 substantially perpendicularly. Provided. The other (rear) first light emitting unit 4 is provided on the front edge side of the light guide plate 7 provided on the rear side, and is provided so that the optical axis X1 is incident on the incident surface 73 of the light guide plate 7 substantially perpendicularly. It is done. The rear first light emitting unit 4 has the same configuration as that of the front first light emitting unit 4, and therefore, the description thereof is omitted unless particularly described.

  Each first light emitting unit 4 is a module having a plurality of first light sources 41 and a wiring board 42 on which the plurality of first light sources 41 are arranged.

  The plurality of first light sources 41 are mounted on a wiring board 42 that is long in the left-right direction, and are arranged in a row in the left-right direction. In this embodiment, they are arranged in one row, but two or more rows may be arranged in the vertical direction. That is, the light from the light sources provided in two or more rows may be incident on the incident surface 73 of the light guide plate 7.

  Each first light source 41 is electrically connected to the wiring board 42. The wiring board 42 is electrically connected to the power supply unit 9. The first light source 41 is mounted on the wiring substrate 42 so that light enters the incident surface 73 in a state of being separated from the light guide plate 7 so as not to contact the incident surface 73 of the light guide plate 7. The optical axis X1 of each first light source 41 is guided from the second surface 72 side of the second light guide unit 7b described later to the first light guide unit 7a described later (of the light guide unit) so as to guide the light guide plate 7. Light is irradiated toward the first surface 71 side of the example. In other words, the first light source 41 is mounted on the wiring board 42 such that the emission direction in which light is emitted faces the side surface (incident surface 73) of the light guide plate 7, and emits light toward the incident surface 73. Each first light source 41 is provided in the housing 2 such that the optical axis X1 is substantially parallel to the light guide plate 7 and the optical axis X1 is substantially orthogonal to the incident surface 73 of the light guide plate 7. Note that the first light source 41 is preferably close to the incident surface 73 of the light guide plate 7 in order to make much light of the first light source 41 enter the incident surface 73 of the light guide plate 7.

  The second light emitting unit 5 has a plate shape elongated in the left-right direction, and is fixed to the housing 2. In the present embodiment, two second light emitting units 5 are fixed to the housing 2. Each of the second light emitting units 5 is arranged such that the optical axis X2 is emitted in a substantially vertical direction (downward in the present embodiment). One second light emitting unit 5 is provided above the light guide plate 7 on the front side, and an upper surface (a second surface 72 (an example of a second region) described later) of the light guide plate 7 and the optical axis X1 are substantially orthogonal to each other. Is provided in the housing 2. The other second light emitting unit 5 is provided above the rear light guide plate 7 and provided in the housing 2 so that the upper surface (second surface 72 described later) of the light guide plate 7 and the optical axis X2 are substantially orthogonal to each other. It is done.

  Each second light emitting unit 5 is a module having a plurality of second light sources 51 and a wiring substrate 52 on which the plurality of second light sources 51 are arranged.

  The plurality of second light sources 51 are mounted on a wiring board 52 that is long in the left-right direction, and are arranged in two rows in the left-right direction. In the present embodiment, two rows of second light sources 51 are arranged in the front-rear direction, but may be one row or three or more rows.

  Each second light source 51 is electrically connected to the wiring board 52. The wiring board 52 is electrically connected to the power supply unit 9. The second light source 51 is disposed so as to overlap the second surface 72 when the light guide plate 7 is viewed in plan. In other words, the second light source 51 is provided above the second light guide 7b. That is, the second light source 51 directly irradiates the second surface 72 of the second light guide part 7b with light.

  More specifically, the second light source 51 is mounted on the wiring board 52 in a state of being separated from the second surface 72 of the light guide plate 7 so as not to contact the light guide plate 7. The second light source 51 emits light so as to intersect the second surface 72. In other words, the second light source 51 is mounted on the wiring substrate 52 so that the light emitting direction is opposite to the second surface 72 of the light guide plate 7, and emits light toward the second surface 72. That is, each second light source 51 is provided in the housing 2 so that the optical axis X2 is substantially perpendicular to the light guide plate 7 and the optical axis X2 is substantially orthogonal to the second surface 72 of the light guide plate 7.

  As described above, the first light source 41 and the second light source 51 are configured such that the optical axis X1 of the first light source 41 and the optical axis X2 of the second light source 51 intersect or are three-dimensional in the second light guide portion 7b of the light guide plate 7. Provided to intersect.

  Each of the first and second light sources 41 and 51 is a so-called SMD (Surface Mount Device) type LED element. 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. Each of the first and second light sources 41 and 51 is turned on and off by being controlled by a control circuit (not shown) provided in the power supply unit 9. In addition, each of the first and second light sources 41 and 51 is controlled by a control circuit provided in the power supply unit 9 to perform dimming and toning.

  The light guide plate 7 is supported by the housing 2 so as to be kept substantially parallel to the ceiling surface of the ceiling. In the present embodiment, the light guide plate 7 is supported in a state where part of the light guide plate 7 is accommodated in the housing 2, the front light guide plate 7 extends from the housing 2 in the front direction and the left and right directions, and the rear guide The light plate 7 extends rearward and leftward and rightward from the housing 2. Each light guide plate 7 has a substantially polygonal flat plate shape in plan view. The shape of each light guide plate 7 is not limited to a substantially polygonal shape, but may be a disc shape, a triangular shape, or a combination of these shapes.

  Each light guide plate 7 is an optical member that guides light emitted from the first light emitting unit 4 and the second light emitting unit 5. Each light guide plate 7 is a translucent resin such as polycarbonate or acrylic, but may be formed of any other material.

  As shown in FIG. 3, the light guide plate 7 includes a first light guide portion 7a and a second light guide portion 7b.

  The first light guide 7 a is a part extending from the housing 2. The second light guide 7 b is a portion that is positioned closer to the first light emitting unit 4 than the first light guide 7 a and is sandwiched between the housing 2 and the cover 8.

  A first surface 71 (an example of a first region), a first emission surface 74, and a third emission surface 76 are formed in the first light guide portion 7a. In addition, a second surface 72, an incident surface 73, and a second emission surface 75 are formed in the second light guide portion 7b.

  The first surface 71 and the second surface 72 are different from each other, and are the upper surface of the light guide plate 7. The first surface 71 is flush with the second surface 72. The area of the first surface 71 is larger than the area of the second surface 72. The first surface 71 is an upper surface of the first light guide portion 7 a in the light guide plate 7 and is a surface in a portion extending from the housing 2 in a substantially horizontal plane shape. The first surface 71 has a substantially parallel relationship with the optical axis X1 of the first light source 41 in the first light emitting unit 4. The first surface 71 has a function of diffusing the guided light. In the present embodiment, as an example of the function of diffusing light, a plurality of prism elements 71a are formed on the first surface 71, and the guided light is diffused and reflected.

  The prism element 71a is, for example, a hemispherical or conical concave groove, and is a hemispherical concave groove in the present embodiment. Each of the prism elements 71a may be randomly formed on the first surface 71, or may be regularly formed.

  The function of diffusing the light on the first surface 71 is not limited to the concave groove, and for example, surface treatment such as embossing is performed to form minute irregularities on the upper surface of the first surface 71 or the first surface 71. It may be configured to have light diffusibility by printing a dot pattern on the upper surface of the substrate. In addition, a resin or white pigment containing a light diffusing material such as silica, calcium carbonate, titanium oxide or the like is dispersed in a translucent base material or applied to the entire upper surface of the first surface 71 so that a milky white color is obtained. A light diffusion film may be formed.

  The second surface 72 is a surface in a portion provided between the housing 2 and the cover portion 8 on the upper surface of the second light guide portion 7 b in the light guide plate 7, and guides light like the first surface 71. The light diffusing treatment is not performed, and the surface is substantially uniform. The second surface 72 faces the second light emitting unit 5 and is in a relationship substantially orthogonal to the optical axis X2 of the second light source 51 in the second light emitting unit 5.

  The incident surface 73 is a side surface of the light guide plate 7 on the first light emitting unit 4 side. The light emitted from the first light emitting unit 4 is incident on the incident surface 73. The incident surface 73 is a plane that is long in the left-right direction substantially orthogonal to the optical axis X1 of the first light source 41 in the first light emitting unit 4, and is substantially parallel to the top-bottom left-right plane.

  The first emission surface 74 and the second emission surface 75 are different surfaces and are the lower surfaces of the light guide plate 7. The first emission surface 74 is flush with the second emission surface 75. The first emission surface 74 is a lower surface of the first light guide portion 7a in the light guide plate 7 and is a surface opposite to the first surface 71 that overlaps the first surface 71 when the light guide plate 7 is viewed in plan. . That is, the first emission surface 74 is the lower surface of the light guide plate 7 in a portion extending from the housing 2. The first emission surface 74 is a surface from which light guided through the light guide plate 7 is emitted. For example, the light diffused and reflected by the prism element 71a of the first surface 71 is emitted.

  The second emission surface 75 is a lower surface of the second light guide portion 7b in the light guide plate 7, and is a surface opposite to the second surface 72 that overlaps the second surface 72 when the light guide plate 7 is viewed in plan. . That is, the second emission surface 75 is a lower surface of the light guide plate 7 in a portion provided between the housing 2 and the cover portion 8. Moreover, the 2nd output surface 75 is a surface where the light which guided the light-guide plate 7 radiate | emits, for example, is a surface which the light of the 2nd light emission part 5 permeate | transmits and radiate | emits.

  The third exit surface 76 is a side surface opposite to the entrance surface 73. The third emission surface 76 is a surface from which light guided through the light guide plate 7 is emitted. For example, the third emission surface 76 is a surface from which light that has traveled straight from the first light emitting unit 4 is emitted. In the present embodiment, the tip is pointed in a triangular shape in a cross-sectional view, but is not limited thereto, and may be a flat planar shape, an arc shape, or the like. The third exit surface 76 may be subjected to a process for diffusing the emitted light.

  The 1st support part 21 is a member which was long in the left-right direction fixed to the housing | casing 2 and the fixing member, and the cross section made reverse U shape. The first support portion 21 in the present embodiment accommodates two second light emitting portions 5 that are adjacent in the front-rear direction and two second support portions 22 that are adjacent in the front-rear direction. One (front) second light emitting unit 5 is fixed to the first support unit 21 at the bottom of the front side of the first support unit 21. Further, the other (rear) second light emitting unit 5 is fixed to the first support unit 21 at a rear bottom portion of the first support unit 21 in a state of being separated from one second light emitting unit 5.

  Each of the second support portions 22 is provided in a gap between two second light emitting portions 5 adjacent to each other in the front-rear direction, and is fixed in a state of being inverted downward from the bottom portion of the first support portion 21. The two second support portions 22 in the present embodiment are members that are long on the left and right, with cross-sections having an inverted L shape, and are provided symmetrically in the front-rear direction in contact with each other. The light emitting units 4 are fixed one to one.

  The first support portion 21 and the second support portion 22 are disposed on the back surfaces of the wiring boards 42 and 52 so that heat generated by the first and second light sources 41 and 51 is conducted through the wiring boards 42 and 52 and radiated. Surface contact. The first support part 21 and the second support part 22 are metal members, and in order to efficiently dissipate the heat generated in the first light emitting part 4 and the second light emitting part 5, aluminum (Al) and copper (Cu). Alternatively, a metal material having a high thermal conductivity such as iron (Fe) may be used as a main component. Moreover, you may comprise the 1st support part 21 and the 2nd support part 22 not only with metal but using the resin material with high heat conductivity.

  The cover portion 8 is long in the left-right direction, and is a member that transmits light emitted from the first light emitting portion 4 and the second light emitting portion 5, for example. The cover unit 8 may have a function of diffusing light emitted from the first light emitting unit 4 and the second light emitting unit 5.

  The cover 8 is provided on the housing 2 so as to cover the second emission surface 75 of the light guide plate 7 when the lighting device 1 is viewed in plan. The cover portion 8 has an arc shape when viewed in cross section, but is not limited to this shape, and may be an arc shape, a triangular shape, or the like.

  The power supply unit 9 is provided in a housing space formed between the housing 2 and the second support unit 22. The power supply unit 9 may be electrically connected when the lighting device 1 is attached to the ceiling ceiling.

  The power supply unit 9 includes a power supply circuit that generates power for causing the first light emitting unit 4 to emit light. The power source unit 9 converts, for example, power supplied from the power system into DC power of a predetermined level by rectification, smoothing, stepping down, and the like, and supplies the DC power to the first light emitting unit 4. The power supply unit 9 is electrically connected to the power system through a power line such as a control line.

  For example, the power supply unit 9 is controlled by a control circuit of the power supply unit 9 to turn on and off the power supply to the first light emitting unit 4. For example, when a lighting operation is received through an operation unit such as a remote controller, the control circuit supplies power from the power supply unit 9 to the first light emitting unit 4 and turns on the first light source 41 of the first light emitting unit 4. Light up. Further, when the operation unit receives an operation of turning off the light, the control circuit cuts off the supply of power from the power supply unit 9 to the first light emitting unit 4, thereby the first light source 41 of the first light emitting unit 4. Turn off the light.

  The behavior of the light emitted from the first and second light sources 41 and 51 in the lighting device 1 will be described with reference to FIGS. FIG. 4 is an explanatory diagram showing the first and second light sources 41 and 51 of the light source in the illumination device 1 according to the first embodiment. FIG. 5 is an explanatory diagram showing the light distribution of the first light source 41 of the first light emitting unit 4 in the illumination device 1 according to Embodiment 1. FIG. In FIG. 3, description will be made using the front light guide plate 7. 3 and 4, the light emitted from the first and second light sources 41 and 51 is indicated by a solid line. FIG. 5 is a view of the light guide plate 7 as viewed from above, and shows the light distribution of the first light source 41 by broken lines.

  The light that has entered the incident surface 73 of the light guide plate 7 from the first light source 41 enters, for example, the prism element of the first surface 71, is diffused and reflected, and exits from the first exit surface 74. Further, the light incident on the incident surface 73 and guided in the direction of the optical axis X1 of the first light source 41 is emitted from the third emission surface 76, for example.

  As shown in FIG. 4, the light from the second light source 51 incident on the second surface 72 of the light guide plate 7 is guided through the light guide plate 7 and emitted from the second emission surface 75, for example. Here, in the light guide plate 7, the second light guide portion 7 b, which is a portion sandwiched between the second surface 72 and the second light exit surface 75, has the light emitted from the first light source 41 and the second light source 51 inside. This is a mixing area for mixing.

  As shown in FIG. 5, the light of the 1st light source 41 in two adjacent 1st light emission parts 4 mutually cross | intersects within the 1st light guide part 7a. In other words, the light of the first light source 41 in the first light emitting unit 4 intersects the light of the first light source 41 in the other first light emitting unit 4 adjacent to the first light emitting unit 4 in the second light guide unit 7b. doing. The light within the refraction angle θ incident on the incident surface 73 from the two adjacent first light sources 41 intersects with each other in the first light guide portion 7a. For this reason, the prism element 71a is provided in the vicinity of the position where the lights of the plurality of first light sources 41 arranged in the left-right direction start to mix. By doing so, the light diffused and reflected by the prism element 71 a provided on the first surface 71 is not spotted, and the brightness spot is hardly caused from the first emitting surface 74 on the second emitting surface 75 side of the light guide plate 7. Note that the uniformity of the light emitted from the light guide plate 7 is increased when the prism elements 71 a are provided after the lights of the two adjacent first light sources 41 are sufficiently overlapped. The refraction angle θ is an angle between a two-dot chain line (substantially parallel to the optical axis X1) perpendicular to the incident surface 73 and light within the maximum light distribution angle of the first light source 41 refracted by the light guide plate 7. In the present embodiment, the light from the first light source 41 preferably has a refraction angle θ incident from the incident surface 73 of the light guide plate 7 of 0 ° or more and 42 ° or less. That is, the angle range of light of the first light source 41 that guides the second light guide part 72 of the light guide plate 7 is 0 ° or more and 84 ° or less. In such an illuminating device 1, the first light source 41 of each first light emitting unit 4 emits light in the front-rear direction, and the second light source 51 of each second light emitting unit 5 emits light downward. Therefore, in the plan view of the lighting device 1, a portion between the first light emitting portion 4 and the other first light emitting portion 4 (a portion on the lower end side of the second support portion 22) is also distributed. That is, when the light emitted from the cover unit 8 is viewed when the lighting device 1 is turned on, luminance unevenness hardly occurs.

[Comparative example]
Next, the structure of the illuminating device 11 which concerns on a comparative example is demonstrated using FIG.

  FIG. 6 is an explanatory diagram showing the light distribution of the light source 111 in the illumination device 11 according to the comparative example. Other configurations in this comparative example are the same as those in the first embodiment, and the same reference numerals are given to the same configurations, and detailed description regarding the configurations is omitted.

  The comparative example is different from the first embodiment in that one second light emitting unit 110 is provided between two adjacent second support portions 22.

  As shown in FIG. 6, the wiring substrate 112 of the second light emitting unit 110 is provided with three rows of light sources 111 arranged in the left-right direction. The optical axis Y of the light source 111 of the second light emitting unit 110 directly irradiates the cover unit 8 below the second light emitting unit 110 without passing through the light guide plate 7. That is, the optical axis X1 passing through the light guide plate 7 is only the optical axis X1 of the first light source 41 in the first light emitting unit 4. That is, the light from the first light emitting unit 4 and the light from the second light emitting unit 110 are not mixed internally unlike the second light guide unit 7b of the first embodiment.

  When such an illuminating device 11 is viewed in plan, on the lower side of the portion corresponding to the second emission surface 75 of the first embodiment (region E1 indicated by a two-dot chain line), In comparison, not much light is emitted and luminance spots are generated in the cover portion 8. That is, when the lighting device 11 is turned on, the periphery of the boundary between the light guide plate 7 and the cover portion 8 looks dark, and such a lighting device 11 is not visible.

[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 surface 71 that diffuses the light to be guided and the second surface 72 that does not diffuse the light that is guided from the first surface 71. The optical plate 7 includes a first light source 41 that emits light from the second surface 72 side toward the first surface 71 side, and a second light source 51 that emits light to the second surface 72. The optical axis X1 of the first light source 41 intersects or three-dimensionally intersects with the optical axis X1 of the second light source 51 in the light guide plate 7.

  According to this configuration, since the optical axis X1 of the first light emitting unit 4 intersects or three-dimensionally intersects with the optical axis X2 of the second light emitting unit 5 within the light guide plate 7, light is irradiated below the second emission surface 75. In addition, as in the illumination device 11 of the comparative example, the lower region E1 of the first light emitting unit 4 is less likely to have a lower brightness than immediately below the light source 111. That is, when this illuminating device 1 is turned on, light is emitted from the illuminating device 1 so that the light emitted from the light guide plate 7 and the light emitted from the cover portion 8 are connected in a plan view. For this reason, it is difficult for luminance spots to occur in the light emitted from the lighting device 1. That is, it is possible to perform illumination that does not impair the appearance when the lighting device 1 is turned on.

  Moreover, it is not necessary to newly provide a light source for irradiating the region E1 of the comparative example, and the enlargement of the lighting device 1 can be suppressed.

  Therefore, luminance unevenness can be suppressed when the lighting device 1 is turned on while suppressing an increase in the size of the lighting device 1.

  In addition, when the light guide plate 7 in the illumination device 1 according to the present embodiment is viewed in plan, the second light emitting unit 5 is disposed so as to overlap the second surface 72.

  According to this structure, since the 2nd light source 51 of the 2nd light emission part 5 can irradiate the area | region below the 2nd light guide part 7b via the 2nd light guide part 7b, the small size of the illuminating device 1 is possible. In addition, it is possible to suppress the occurrence of uneven brightness of the light emitted from the lighting device 1 with a simple configuration.

  In the illumination device 1 according to the present embodiment, the area of the first surface 71 is larger than the area of the second surface 72.

  When the area of the first surface 71 is smaller than the area of the second surface 72, the second light source 51 of the second light-emitting unit 5 is moved back and forth in order to irradiate the lower region of the second light guide unit 7b. The columns must also be arranged. However, according to this configuration, the light from the first light source 41 in the first light emitting unit 4 is diffusely reflected by the prism element 71a and emitted in the downward direction, the left and right direction, etc. of the light guide plate 7, so that the second light emitting unit 5 is difficult to increase. For this reason, in this illuminating device 1, the enlargement of an apparatus can be suppressed more.

  Moreover, in the illuminating device 1 which concerns on this Embodiment, the light guide plate 7 has the 2nd light guide part 7b in which the 2nd surface 72 was formed. A plurality of first light sources 41 are arranged. And the light within the light distribution angle in the two adjacent first light sources 41 intersects with each other in the second light guide portion 7b.

  According to this configuration, the light within the light distribution angle in the two adjacent first light emitting units 4 intersects with each other in the second light guide unit 7 b, and thus exits from the first output surface 74 of the light guide plate 7. Luminance spots are less likely to occur in the light.

(Modification 1 of Embodiment 1)
Hereinafter, the illuminating device 100 which concerns on this modification is demonstrated using FIG.

  FIG. 7 is a partial enlarged cross-sectional view showing lighting apparatus 100 according to Modification 1 of Embodiment 1.

  In the first embodiment, the two adjacent second support portions 22 are provided symmetrically in the front-rear direction in contact with each other. However, in the present modification, the second support portions 22 are separated from each other. The third light emitting portion 6 is different between the two adjacent second support portions 22.

  Other configurations in the present modification are the same as those in the first embodiment, and the same reference numerals are given to the same configurations, and detailed descriptions thereof are omitted.

  As shown in FIG. 7, the 3rd light emission part 6 has comprised the plate shape long in the left-right direction. In the present modification, the third light emitting unit 6 is fixed to the first support unit 21 of the housing 2. The first light emitting unit 4 is arranged so that the optical axis X3 is emitted in a substantially vertical direction (downward in this modification). The optical axis X3 of the third light source 61 in the third light emitting unit 6 does not pass through the light guide plate 7 and directly irradiates the cover unit 8 below the third light emitting unit 6.

  The third light emitting unit 6 is a module having a plurality of third light sources 61 and a wiring board 62 on which the plurality of third light sources 61 are arranged.

  The plurality of third light sources 61 are wiring boards 62 that are long in the left-right direction, and are arranged in a row in the left-right direction. In this modified example, they are arranged in one row, but two or more rows may be arranged in the front and rear. Each of the third light sources 61 may have the same configuration as the first and second light sources 41 and 51.

  In addition, although the several 3rd light source 61 is provided between the two adjacent 2nd support parts 22, the light which each 3rd light source 61 emits to the wall surface of two adjacent 2nd support parts 22 The surface may be mirror-reflected or diffused. The wall surfaces of two adjacent second support portions 22 are surfaces in which the wall surface of one second support portion 22 faces the wall surface of the other second support portion 22.

  In such an illuminating device 100, since the 3rd light source 61 of the 3rd light emission part 6 irradiates light under two adjacent 2nd support parts 22, the downward direction of the 2nd support part 22 becomes difficult to become darker. That is, the illumination device 100 hardly causes luminance spots.

  Also in this modification, there exists an effect similar to Embodiment 1. FIG.

(Modification 2 of Embodiment 1)
Hereinafter, the illuminating device 1 which concerns on this modification is demonstrated using FIG.

  FIG. 8 is a partial enlarged cross-sectional view showing the illumination device 1 according to the second modification of the first embodiment.

  The present modification is different from the first embodiment in that a prism sheet 120 (an example of a light diffusing unit) is provided on the second emission surface 75.

  As shown in FIG. 8, the prism sheet 120 is formed on the second emission surface 75 (the surface of the light guide plate 7 opposite to the first surface 71) that overlaps the first surface 71 when the light guide plate 7 is viewed in plan. Has been done. A prism sheet 120 that diffuses and transmits the light guided through the light guide plate 7 is provided on the lower surface of the second light guide portion 7b. In this modification, a prism sheet 120 on which a fine optical structure for diffusing light transmitted through the light guide plate 7 is formed is provided on the lower surface of the second light guide portion 7b. In the present modification, the lower surface of the prism sheet 120 is the second emission surface 75. The prism sheet 120 is provided on the lower surface of the second light guide portion 7b, but may be provided on the upper surface.

  The prism sheet 120 applied to the second emission surface 75 may be, for example, a milky white light diffusion film containing a light diffusion material or the like, and light diffusion is internally performed on the lower side surface of the second light guide portion 7b. It may be a light diffusion layer containing a material or the like. The light diffusing material is a milky white resin containing a light diffusing material (fine particles) such as silica or calcium carbonate. Further, the prism sheet 120 may be coated on the entire surface of the second emission surface 75 to form a milky white light diffusion film.

  The prism sheet 120 is formed with, for example, a plurality of uneven portions having a fine optical structure, and the plurality of uneven portions are arranged in a matrix. Each of the uneven portions has a triangular pyramid shape, a quadrangular pyramid shape, a conical shape, a substantially hemispherical shape, or the like.

  Thereby, in the illuminating device 1 according to this modification, the surface of the light guide plate 7 that is the surface opposite to the second surface 72 and overlaps the second surface 72 when the light guide plate 7 is viewed in plan view, A prism sheet 120 that diffuses and transmits the guided light is provided.

  According to this configuration, since the light from the light source 51 of the second light emitting unit 5 is diffused and emitted by the prism sheet 120 of the light guide plate 7, the light emitted from the second emission surface 75 is below the second support unit 22. It is easy to irradiate. For this reason, in the illuminating device 1, it is hard to produce a brightness spot.

  Also in this modification, there exists an effect similar to Embodiment 1. FIG.

(Modification 3 of Embodiment 1)
Hereinafter, the illuminating device 1 which concerns on this modification is demonstrated using FIG.

  FIG. 9 is an explanatory diagram illustrating the light distribution of the first light source 41 of the first light emitting unit 4 in the illumination device 1 according to the third modification of the first embodiment. FIG. 9 is a view of the light guide plate 7 and the first light source 41 as viewed from below.

  This modification is different from the first embodiment in that light diffusion processing is performed on the second emission surface 75.

  As shown in FIG. 9, the light diffusion process is performed on the region R <b> 1 of the second emission surface 75 (the surface of the light guide plate 7 opposite to the first surface 71) when the light guide plate 7 is viewed in plan. Yes. That is, the light diffusion process is performed on the lower surface of the second light guide 7b. The light diffusion process is provided in the region R1 where the light from the first light source 41 is not incident, rather than the light within the refraction angle θ of the first light source 41 that guides the light in the second light guide 7b. The region R1 in which the light of the first light source 41 is not incident on the light within the refraction angle θ of the first light source 41 is a region outside the refraction angle θ of the first light source 41, and the light of the first light source 41 is incident. This is a region where the light from the second light source 42 is incident.

  In this modification, an uneven fine optical structure that diffuses the light of the second light source 51 that passes through the light guide plate 7 is formed. In addition, although the light-diffusion process is provided in the lower surface of the 2nd light guide part 7b, you may provide it in an upper surface. Note that the plurality of concavo-convex portions that are fine optical structures are arranged in a matrix. Each of the uneven portions has a triangular pyramid shape, a quadrangular pyramid shape, a conical shape, a substantially hemispherical shape, or the like.

  Note that the light diffusion process performed on the region R1 of the second emission surface 75 is not limited to the uneven fine optical structure, and may be, for example, a milky white light diffusion film including a light diffusion material or the like. 2 A light diffusing layer containing a light diffusing material or the like inside may be provided on the lower surface of the light guide 7b. The light diffusing material is a milky white resin containing a light diffusing material (fine particles) such as silica or calcium carbonate. Further, a milky white light diffusing film may be formed by coating the entire surface of the region R1 of the second emission surface 75.

  Instead of using a light diffusing material, surface treatment such as embossing is performed to form minute irregularities in the region R1 of the second emission surface 75 of the light guide plate 7, or on the upper surface of the first light guide portion 7a. The light guide plate 7 having light diffusibility can also be realized by printing a dot pattern. Note that a light diffusing material may be further added to the light guide plate 7 in which the unevenness or the dot pattern is formed in the region R1 of the second emission surface 75.

  Thereby, in the illuminating device 1 according to the present modification, the light guide plate overlaps the second surface 72 when the light guide plate 7 is viewed from the surface opposite to the second surface 72 (second emission surface 75). The surface of the light plate 7 is subjected to a light diffusion process that diffuses and transmits the guided light. Then, the light diffusion process is provided in the region R1 where the light of the first light source 41 is not incident than the light within the refraction angle of the first light source 41 that guides the light in the second light guide 7b.

  According to this configuration, only the light diffusion process is performed on the region R1 that is a part of the second emission surface 75, and there is no need to provide another member such as a prism sheet. .

  Also in this modification, there exists an effect similar to Embodiment 1. FIG.

(Embodiment 2)
Next, lighting device 200 according to the present embodiment will be described with reference to FIG.

  FIG. 10 is a partial enlarged cross-sectional view showing the lighting device 1 according to the second embodiment.

[Constitution]
First, the configuration of lighting apparatus 200 according to the present embodiment will be described.

  In the first embodiment, the first light emitting unit 4 and the second light emitting unit 5 are used. However, in the present embodiment, the first light source 241 and the second light source 251 are mounted on the same wiring board 242. And a point that the reflection plate 220 is used.

  In this Embodiment, the other structure in the illuminating device 200 is the same as that of the illuminating device 1 of Embodiment 1, and unless otherwise mentioned, the same code | symbol is attached | subjected about the same structure and the detail regarding a structure is mentioned. The detailed explanation is omitted. In addition, since each 1st light emission part 240 and each light-guide plate 7 are symmetrical before and behind and are the same structure, the description is abbreviate | omitted unless it describes especially.

  As shown in FIG. 10, in the first light emitting unit 240 of the present embodiment, a plurality of first light sources 241 and second light sources 251 arranged in the left-right direction are arranged in three rows in the up-down direction. Specifically, the first light source 241 is provided on the wiring board 242 so that light enters the incident surface 73 of the light guide plate 7. That is, the wiring board 242 is provided so as to intersect on the extension line of the light guide plate 7. The first light sources 241 are arranged in the left-right direction in one row below the wiring board 242. The second light source 251 is provided on the wiring board 242 so as to irradiate the reflection plate 220 with light. The second light sources 251 are arranged above the first light sources 241 in the left and right directions in two rows in the vertical direction on the wiring board 242. Other configurations of the first light emitting units 240 are the same as those of the first light emitting unit 4 of the first embodiment, and the description thereof is omitted.

  The upper two rows of second light sources 251 in the first light emitting unit 240 of the present embodiment are mounted on the wiring board 242 so that each optical axis Z intersects the reflecting plate 220. That is, the light emitted from the second light source 251 in the first light emitting unit 240 is mainly reflected by the reflecting plate 220 and enters the second surface 72 of the light guide plate 7. In addition, each first light source 241 in the column provided on the lower end side of the first light emitting unit 240 is provided so that light is incident on the incident surface 73 of the light guide plate 7. In the present embodiment, the first light source 241 and the second light source 251 are arranged in three rows vertically, but the first light source 241 may be two or more rows, and the second light source 251 is two rows or less or four rows or more. But you can.

  In the present embodiment, the two reflectors 220 are provided so as to face the two first light emitting units 240 on a one-to-one basis. In addition, the reflecting plate 220 and the 1st light emission part 240 are not limited to two, One may be sufficient and three or more may be sufficient.

  The reflection plate 220 is long in the left-right direction and has a cross-section curved in an arc shape. The reflection plate 220 is a member that can reflect the light emitted from the second light source 251 in the first light emitting unit 240 toward the second surface 72 of the light guide plate 7. That is, the reflection plate 220 reflects the light from the second light source 251 so as to intersect the second surface 72.

  The reflection plate 220 may be formed of, for example, a metal material such as aluminum, and a white diffuse reflection coating or a metal vapor deposition film (metal reflection film) made of a metal material such as silver or aluminum is formed. Realized by mirror finish by mirror coating or polishing.

  In such an illumination device 200, the light of the second light source 251 in the first light emitting unit 240 is reflected by, for example, the reflection plate 220, enters the second surface 72, guides the light guide plate 7, and outputs the second light. The light exits from the surface 75. In addition, when the light from the second light source 251 is incident on the reflection plate 220 at a deep angle, the light is directed toward the first light emitting unit 240 when reflected by the reflection plate 220. Therefore, the illumination device 200 is second supported in a plan view. The portion on the lower end side of the portion 22 is also distributed. That is, when the light emitted from the cover unit 8 is viewed when the lighting device 200 is turned on, no luminance spots are generated.

[Function and effect]
Next, the function and effect of lighting apparatus 200 in the present embodiment will be described.

  As described above, the illumination device 200 according to the present embodiment further includes the reflection plate 220 that reflects light. The reflection plate 220 reflects the light from the second light source 251 so as to intersect the second surface 72.

  According to this configuration, since the reflection plate 220 intersects the light from the second light source 51 with the second surface 72, the light from the first light source 51 and the light from the second light source 51 intersect in the second light guide 7b. Or a three-dimensional intersection. For this reason, in the illuminating device 200, it is hard to produce a brightness spot.

  In the lighting device 200 according to the present embodiment, the first light source 41 and the second light source 51 are mounted on the same wiring board 242. The wiring board 242 crosses the light guide plate 7 three-dimensionally.

  According to this configuration, since the first light source 241 and the second light source 251 are mounted on one wiring board 242, compared to the case where the first light source 241 and the second light source 251 are provided on separate wiring boards 242. The equipment can be simplified.

  Also in this embodiment, the same operational effects as those of the first embodiment are obtained.

(Other variations)
As mentioned above, although the illuminating device which concerns on this invention was demonstrated based on Embodiment 1, 2 and the modifications 1-3 of Embodiment, this invention is a modification of the said Embodiment 1, 2 and Embodiment. It is not limited to Examples 1-3.

  For example, in the above embodiment, each light source may emit light of a different color. In this case, for example, the light source may emit blue light, red light, green light, and the like.

  Further, in the above embodiment, the light source is not limited to such a configuration, and a COB (Chip On Board) type light emitting unit in which an LED chip is directly mounted on a substrate (not shown) of the light source is provided. May be used. The light emitting elements included in each light source are not limited to LEDs. For example, other solid light emitting elements such as a semiconductor light emitting element such as a semiconductor laser, or an EL element such as an organic EL (Electro Luminescence) or an inorganic EL. It may be an element.

  Moreover, in the said embodiment, in the 1st light source and the 2nd light source, the light source which emits white light and light bulb color light may be arranged alternately, and the light source which emits white light and blue light may be arranged alternately. .

  In the above embodiment, the light distribution of the lighting device may be changed by appropriately changing the shape of the prism elements, and the closer to the first light source, the smaller the prism element arrangement ratio (coverage ratio). The distance may increase as the distance from the first light source increases. In this case, the brightness of the light emitted from the light guide plate tends to be uniform.

  In addition, Embodiments 1 and 2 and Embodiments 1 and 2 which are obtained by making various modifications conceivable by those skilled in the art to Modifications 1 to 3 of the embodiment and within the scope of the present invention are not included. And the form implement | achieved by combining arbitrarily the component and function in the modifications 1-3 of embodiment are also contained in this invention.

1, 100, 200 Illumination device 7 Light guide plate 7b Second light guide (light guide)
41, 241 First light source 51 Second light source 42, 52, 242 Wiring board (board)
71 1st surface 72 2nd surface 120 Prism sheet (light diffusion part)
220 reflector

Claims (8)

A light guide plate having a first region for diffusing the light to be guided and a second region for not diffusing the light to be guided than the first region;
A first light source that emits light from the second region side toward the first region side;
A second light source for irradiating the second region with light,
The optical axis of the first light source intersects or three-dimensionally intersects with the optical axis of the second light source within the light guide plate. The lighting device according to claim 1, wherein the second light source is disposed so as to overlap the second region when the light guide plate is viewed in plan. The lighting device according to claim 1, wherein an area of the first region is larger than an area of the second region. Furthermore, a reflection plate for reflecting light is provided,
The illuminating device according to any one of claims 1 to 3, wherein the reflector reflects the light from the second light source so as to intersect the second region. The first light source and the second light source are mounted on the same substrate,
The lighting device according to claim 4, wherein the substrate is three-dimensionally crossed with the light guide plate. The light guide plate has a light guide part in which the second region is formed,
A plurality of the first light sources are arranged,
The illuminating device according to claim 1, wherein lights of two adjacent first light sources intersect each other within the light guide unit. The surface of the light guide plate that is opposite to the second region and that overlaps the second region when the light guide plate is viewed in plan is subjected to a light diffusion process that diffuses and transmits the guided light. And
The lighting device according to claim 6, wherein the light diffusion process is provided in a region where light of the first light source is not incident, rather than light within a refraction angle of the first light source that guides the light guide portion. A light diffusing portion for diffusing and transmitting the guided light is provided on the surface opposite to the second region and on the surface of the light guide plate that overlaps the second region when the light guide plate is viewed in plan view. The illumination device according to any one of claims 1 to 6.

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