JP6910007B2 - Lighting device - Google Patents

Description

The present invention relates to a lighting device.

Conventionally, there is known an illumination device using a light guide plate in which light from a light source is incident on a side surface of the light guide plate and emitted from the surface of the light guide plate (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 5-107542

The light guide plate is provided with a through hole for attaching to the main body of the lighting device, but the through hole blocks the light traveling in the light guide plate and causes a shadow in the light guide plate. When a shadow is generated, the appearance of the surface of the light guide plate at the time of light emission is impaired.

Therefore, an object of the present invention is to provide an illuminating device capable of suppressing shadows in a light guide plate due to a through hole for mounting and improving the uniformity of light on the surface of the light guide plate. ..

In order to solve the above problems, the lighting device according to one aspect of the present invention has a front surface, a back surface opposite to the front surface, and an incident surface on which light is incident, and guides the light incident from the incident surface. Then, a light guide plate that reflects light at a plurality of recesses formed on the back surface and emits light from the front surface and an arrangement along the extending direction of the incident surface so that the light is incident on the incident surface. A plurality of through holes penetrating from the front surface to the back surface are arranged along the incident surface at the end of the light guide plate on the incident surface side, and at least the plurality of through holes are provided. In the facing regions facing each other via the incident surface, a plurality of light sources are arranged more densely than in the non-facing regions.

According to the present invention, it is possible to improve the uniformity of light on the surface of the light guide plate by suppressing the shadow in the light guide plate caused by the through hole for mounting.

FIG. 1 is a perspective view of the lighting device according to the embodiment. FIG. 2 is a cross-sectional view of the lighting device according to the embodiment. FIG. 3 is a top view showing the light guide plate and the light emitting module according to the embodiment. FIG. 4 is an explanatory view showing an example of a shadow formed in the light guide plate by the through hole. FIG. 5 is an explanatory diagram showing an example of a structure that suppresses the generation of shadows caused by through holes. FIG. 6 is an explanatory diagram showing the positional relationship between the light source at one end and the through hole at one end according to the embodiment. FIG. 7 is an enlarged view showing a part of the light guide plate according to the first modification. FIG. 8 is an enlarged view showing a part of the light guide plate according to the second modification. FIG. 9 is an enlarged view showing a part of the light guide plate according to the modified example 3. FIG. 10 is a cross-sectional view of the lighting device according to the modified example 4.

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 of the components, connection forms, etc. shown in the following embodiments are examples and are not intended to limit the present invention. Therefore, among the components in the following embodiments, the components not described in the independent claims indicating the highest level concept of the present invention will be described as arbitrary components.

It should be noted that each figure is a schematic view and is not necessarily exactly illustrated. Further, in each figure, the same reference numerals are given to substantially the same configurations, and duplicate description will be omitted or simplified.

Hereinafter, a light guide plate and a lighting device using the light guide plate according to the embodiment of the present invention will be described.

[Constitution]
First, the configuration of the lighting device according to the embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a perspective view of the lighting device 10 according to the embodiment. FIG. 2 is a cross-sectional view of the lighting device 10 according to the embodiment.

As shown in FIGS. 1 and 2, the lighting device 10 is an edge light type lighting device and is fixed to the ceiling. Specifically, the lighting device 10 is fixed to the ceiling in a state of being connected to an external power source (not shown) arranged behind the ceiling.

The lighting device 10 includes a main body portion 11, a power supply portion 13, a pair of light emitting modules 15, and a pair of light guide plates 30.

The main body 11 is formed in a long box shape, and houses the power supply 13 electrically connected to an external power supply. Further, light guide plate support portions 21 are provided on both sides of the main body portion 11. Since the light guide plate support portion 21 is the same on both side portions of the main body portion 11, one light guide plate support portion 21 will be described, and the other light guide plate support portion 21 will be omitted.

The light guide plate support portion 21 is a rectangular groove portion recessed from one side surface of the main body portion 11 toward the other side. A plurality of screw holes 211 for screwing the light guide plate 30 are formed on the top surface of the light guide plate support portion 21. The plurality of screw holes 211 are arranged at predetermined intervals along the longitudinal direction of the main body 11. The light guide plate 30 supported by the light guide plate support portion 21 is arranged substantially parallel to the ceiling. Further, the inner surface of the light guide plate support portion 21 on the inner side is substantially orthogonal to the top surface of the light guide plate support portion 21. A light emitting module 15 is attached to the inner surface of the light guide plate support portion 21.

The light emitting module 15 is arranged in the light guide plate support portion 21, and includes a substrate 151 and a plurality of light sources 152.

The substrate 151 is a long rectangular plate-shaped substrate. The substrate 151 is installed on the inner side surface of the light guide plate support portion 21 so as to be parallel to the longitudinal direction of the main body portion 11.

The plurality of light sources 152 are so-called SMD (Surface Mount Devices) 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 light source 152 is turned on and off by being controlled by a control unit (not shown) provided in the power supply unit 13. Further, each light source 152 is subjected to dimming and toning control by a control unit.

The light emitting module 15 is not limited to such a configuration, and a COB (Chip On Board) type light emitting module in which an LED chip is directly mounted on a substrate 151 may be used. Further, the light emitting element included in the light source 152 is not limited to the LED, and is, for example, a semiconductor light emitting element such as a semiconductor laser, or another solid light emitting element such as an EL element such as an organic EL (Electro Luminescence) or an inorganic EL. It may be.

The plurality of light sources 152 are arranged between the incident surface 31 of the light guide plate 30 and the inner surface of the light guide plate support portion 21. The light source 152 is arranged so that the exit direction in which the light is emitted faces the incident surface 31 of the light guide plate 30, and the light is incident toward the incident surface 31. That is, the emission direction of the light source 152 is substantially perpendicular to the incident surface 31 of the light guide plate 30.

The light guide plate 30 has a rectangular flat plate shape in a plan view. The light guide plate 30 is an optical member that guides the light from the light source 152 toward the emission surface 32 described later. The light guide plate 30 is formed of a translucent resin such as polycarbonate or acrylic, but may be formed of other translucent material.

The light guide plate 30 is supported by the light guide plate support portion 21 so as to be substantially parallel to the ceiling. One side surface of the light guide plate 30 arranged in the light guide plate support portion 21 is an incident surface 31 on which light from a plurality of light sources 152 is incident. The incident surface 31 extends along the longitudinal direction of the main body 11. A plurality of light sources 152 are arranged at predetermined intervals along the extending direction of the incident surface 31.

Of the pair of main surfaces of the light guide plate 30, one main surface is a surface facing downward, and is an exit surface 32 that emits light. Of the pair of main surfaces of the light guide plate 30, the main surface on the opposite side is the back surface facing the ceiling, and is the reflection surface 33 that reflects the light passing through the light guide plate 30. In the light guide plate 30, an incident surface 31 is provided between the emitting surface 32 and the reflecting surface 33.

The entrance surface 31 and the exit surface 32 of the light guide plate 30 are flat. The reflection surface 33 of the light guide plate 30 is a surface opposite to the exit surface 32 of the light guide plate 30.

FIG. 3 is a top view showing the light guide plate 30 and the light emitting module 15 according to the embodiment. As shown in FIG. 3, the light guide plate 30 includes a mixing region M1 and a reflection region M2.

The reflection region M2 is a region farther from the light source 152 than the mixing region M1 and is a region in which the lights of the plurality of light sources 152 are mixed to make the brightness uniform. As shown in FIGS. 2 and 3, a plurality of recesses 37 recessed toward the exit surface 32 are arranged in a matrix in the reflection region M2 on the reflection surface 33 of the light guide plate 30. In other words, the reflection region M2 can be said to be a region in which a plurality of recesses 37 are formed.

The recess 37 is a prism recessed in a frustum shape or a cone shape. For example, specific shapes of the recess 37 include a truncated cone shape, a pyramidal trapezoidal shape, a conical shape, and a pyramidal shape. The light traveling through the light guide plate 30 is reflected by the inner surface of the recess 37 in the light guide plate 30, heads toward the exit surface 32, and is emitted from the exit surface 32 to become illumination light.

The mixing region M1 is a region in which the light of the plurality of light sources 152 incident from the incident surface 31 is not sufficiently mixed. The mixing region M1 is interposed between the incident surface 31 and the reflection region M2. A plurality of through holes 36 penetrating from the exit surface 32 to the reflection surface 33 are formed at the end of the mixing region M1 on the incident surface 31 side. The plurality of through holes 36 are arranged at predetermined intervals along the extending direction of the incident surface 31. The light guide plate 30 is supported by the light guide plate support portion 21 by fastening the screws 80 to the screw holes 211 of the light guide plate support portion 21 through the plurality of through holes 36.

[Positional relationship between through hole and light source]
By the way, the through hole 36 for screwing blocks the light traveling in the light guide plate 30. FIG. 4 is an explanatory view showing an example of a shadow formed in the light guide plate 30 by the through hole 36. Note that FIG. 4 shows a state in which one light source 152 is arranged for one through hole 36. As shown in FIG. 4, the light L emitted from the light source 152 enters the light guide plate 30 from the incident surface 31 and travels in the light guide plate 30. At this time, since a part of the light L is blocked by the through hole 36, a shadow S1 is formed in the light guide plate 30. When such a shadow S1 is generated, the appearance of the surface of the light guide plate 30 at the time of light emission is impaired.

Therefore, in the present embodiment, a structure that suppresses the generation of the shadow S1 is adopted. Specifically, the positional relationship between the plurality of through holes 36 and the plurality of light sources 152 is determined so that the generation of the shadow S1 is suppressed. Hereinafter, the positional relationship between the plurality of through holes 36 and the plurality of light sources 152 will be described in detail.

FIG. 5 is an explanatory diagram showing an example of a structure that suppresses the generation of the shadow S1 due to the through hole 36. In FIG. 5, a plurality of light sources 152 are arranged more densely than in the case of FIG. 4 in the facing region H1 facing the through hole 36 via the incident surface 31 of the light guide plate 30. The facing region H1 is a region on the substrate 151. Specifically, four light sources 152 are arranged at equal intervals in the facing region H1. When a plurality of light sources 152 are densely arranged in the facing region H1 in this way, the through hole 36 is illuminated by the light L emitted by each light source 152, so that the shadow S1 is canceled. Note that FIG. 5 shows only the shadow S1 caused by the light from one light source 152. In reality, a plurality of shadows are formed by the light from all the light sources 152 in the opposite region H1, but these shadows are also canceled by the light from the other light sources 152.

Here, the center of the facing region H1 is at the same position as the center of the through hole 36, and the width of the facing region H1 is obtained by the equation (1).

Here, as shown in FIG. 3, α is an angle that is half of the irradiation angle of the light source 152. Specifically, α is 42 degrees. The side A is a straight line that intersects the normal line passing through the center of the light source 152 located at the end of the facing region H1 at an angle α, and is a straight line that is tangent to the through hole 36. The side B is a normal line of the incident surface 31 and is a straight line passing through the center of the through hole 36. The side C is a straight line connecting the intersection of the incident surface 31 on the side A and the intersection of the incident surface 31 on the side B. The width of the facing region H1 is obtained by doubling this side C. The width of the facing region H1 may be equal to or less than the value obtained by the equation (1).

Further, the distance between adjacent light sources 152 arranged in the facing region H1 is smaller than the diameter of the through hole 36. If this interval is equal to or larger than the diameter of the through hole 36, the number of light sources 152 that can be installed in the facing region H1 will be small, and the amount of cancellation of the shadow S1 will be small. The minimum value of this interval is 2 mm. Further, this interval may be the interval between the center positions of the adjacent light sources 152, or may be the interval between the adjacent light sources 152.

In the present embodiment, as shown in FIG. 3, among the plurality of through holes 36, the region facing the through holes 36 other than the through holes 36 at both ends via the incident surface 31 is the facing region H1. On the other hand, the region facing the incident surface 31 in the through holes 36 at both ends is an unmounted region H2 in which the light source 152 is not mounted. The region between the plurality of opposed regions H1 is a non-opposed region h1 that does not face the through hole 36. The region between the opposed region H1 and the unmounted region H2 is a non-opposed region h2 that does not face the through hole 36. In the present embodiment, since one light source 152 is arranged at the boundary portion between the unmounted region H2 and the non-mounted region h2, the light source 152 partially enters the unmounted region H2. Even in this case, it is assumed that the light source 152 is not mounted in the unmounted region H2.

Here, also in the non-opposing regions h1 and h2, if a plurality of light sources 152 are arranged at the same density as the facing regions H1, the number of installed light sources 152 increases, which leads to an increase in cost. Therefore, in the non-opposing regions h1 and h2, it is required to arrange a plurality of light sources 152 having a lower density than the facing regions H1. At this time, if a plurality of light sources 152 are evenly arranged in the non-opposing regions h1 and h2, the brightness suddenly changes at the boundary portion with the facing region H1 in which the light sources 152 are densely arranged, resulting in uneven brightness. It will stand out. In order to suppress this luminance unevenness, the arrangement of the plurality of light sources 152 in the non-opposing regions h1 and h2 is appropriate.

For example, the plurality of light sources 152 arranged in the non-opposing region h1 are arranged so that the distance between them increases as the distance from the facing region H1 increases. Since the non-opposing region h1 is a region sandwiched between the two opposing regions H1, the distance between the plurality of light sources 152 is the widest in the middle and the narrowest between both ends. As shown in FIG. 3, when six light sources 152 are arranged in the non-opposing region h1, the relationship between the center interval d3, the interval d1 at both ends, and the interval d2 between them is d1 <d2 <d3. The interval d1 is larger than the interval between the plurality of light sources 152 in the facing region H1.

Further, the plurality of light sources 152 arranged in the non-opposing region h2 are arranged so that the distance between them increases as the distance from the facing region H1 increases. As shown in FIG. 3, when five light sources 152 are arranged in the non-opposing region h2, if the spacing d4, the spacing d5, the spacing d6, and the spacing d7 are set in the order of proximity to the facing region H1, the relationship between them is , D4 <d5 <d6 <d7. The interval d4 is larger than the interval between the plurality of light sources 152 in the facing region H1.

As described above, in the non-opposing regions h1 and h2, since the plurality of light sources 152 are arranged so as to increase the interval as the distance from the facing region H1 increases, the brightness gradually decreases as the distance from the facing region H1 increases. Become. That is, it is possible to suppress a steep change in brightness at the boundary portion between the opposite region H1 and the non-opposed regions h1 and h2, and it is possible to suppress the conspicuous brightness unevenness.

Next, the positional relationship between the light sources 152 at both ends and the through holes 36 at both ends will be described.

FIG. 6 is an explanatory diagram showing the positional relationship between the light source 152 at one end and the through hole 36 at one end according to the embodiment. Since the positional relationship between the light source 152 and the through hole 36 on the other end side is the same as that on the one end side, the description thereof will be omitted here.

As shown in FIG. 6, the light source 152 at one end of the plurality of light sources 152 in the extending direction is a shadow S2 formed when the through hole 36 at one end of the plurality of through holes 36 is irradiated with light. Is arranged at a position within the mixing region M1 of the light guide plate 30. As a result, it is possible to prevent the shadow S2 caused by the through hole 36 at one end from entering the reflection region M2 even if the light source 152 is not densely provided in the unmounted region H2.

[Effects, etc.]
As described above, the lighting device 10 according to the present embodiment has a front surface (emission surface 32), a back surface opposite to the front surface (reflection surface 33), and an incident surface 31 on which light is incident. The light incident from the surface 31 is guided, the light is reflected by the plurality of recesses 37 formed on the back surface, and the light is emitted from the front surface, so that the light is incident on the incident surface 31 and the light guide plate 30. , A plurality of light sources 152 arranged along the extending direction of the incident surface 31. At the end of the light guide plate 30 on the incident surface 31 side, a plurality of through holes 36 penetrating from the front surface to the back surface are arranged along the incident surface. In the facing region H1 facing at least one of the plurality of through holes 36 via the incident surface 31, a plurality of light sources 152 are arranged more densely than the non-opposing regions h1 and h2.

According to this, in the facing region H1, since the plurality of light sources 152 are arranged more densely than in the non-opposing regions h1 and h2, the through hole 36 is illuminated by the plurality of light sources 152. As a result, the shadow S1 formed when irradiated by one light source 152 is canceled by the light from the other light source 152. Therefore, the shadow S1 in the light guide plate 30 caused by the through hole 36 for mounting can be suppressed, and the uniformity of light on the exit surface 32 of the light guide plate 30 can be improved.

Further, the plurality of light sources 152 arranged in the facing region H1 are arranged at equal intervals, and the plurality of light sources 152 arranged in the non-opposing regions h1 and h2 are spaced apart from the facing region H1 so that the intervals become larger. It is arranged.

According to this, in the non-opposing regions h1 and h2, since the plurality of light sources 152 are arranged so as to increase the interval as the distance from the facing region H1 increases, the brightness gradually decreases as the distance from the facing region H1 increases. become. That is, it is possible to suppress a steep change in brightness at the boundary portion between the opposite region H1 and the non-opposed regions h1 and h2, and it is possible to suppress the conspicuous brightness unevenness.

Further, among the plurality of light sources 152, the light sources 152 at both ends in the extending direction have a shadow S2 formed when the through holes 36 at both ends of the plurality of through holes 36 are irradiated with light, and the light guide plate 30 has a shadow S2. It is arranged at a position within the mixing region M1.

According to this, since the shadow S2 caused by the through holes 36 at both ends is contained in the mixing region M1 of the light guide plate 30, the shadow S2 is placed in the reflection region M2 even if the light source 152 is not densely provided in the unmounted region H2. It is possible to prevent entry. Therefore, the uniformity of light on the exit surface 32 of the reflection region M2 can be improved.

Further, among the plurality of through holes 36, in the plurality of facing regions H1 facing the through holes 36 other than the through holes 36 at both ends, the plurality of light sources 152 are arranged more densely than the non-opposing regions h1 and h2.

According to this, since the plurality of light sources 152 are arranged more densely than the non-opposed regions h1 and h2 in all of the plurality of opposed regions H1, shadows caused by the through holes 36 other than the through holes 36 at both ends are caused. Can be suppressed. Therefore, the uniformity of light on the surface of the light guide plate 30 can be further improved.

[Modification 1]
In the above embodiment, a case where a plurality of recesses 37 are arranged in a matrix on the reflecting surface 33 of the light guide plate 30 is illustrated. In the first to third modifications, other layout examples of the plurality of recesses 37 will be described. In the following description, the description may be omitted in the same parts as those in the above embodiment.

FIG. 7 is an enlarged view showing a part of the light guide plate 30A according to the first modification. In FIG. 7, among the lights emitted by each of the plurality of light sources 152, the light reaching the through hole 36 and the shadow formed by blocking the light by the through hole 36 are shown by a pair of virtual lines L2 and L3. ing. That is, in the portion sandwiched between the pair of virtual lines L2 and L3, the through hole 36 to the light source 152 show light, and the portion on the opposite side shows a shadow.

As shown in FIG. 7, in the light guide plate 30A, the coverage of the plurality of recesses 37 per unit area on the reflecting surface 33a is a region superposed on the shadow of the through hole 36 formed by the light from each of the plurality of light sources 152. Is higher than other areas. Here, the region superimposed on the shadow of the through hole 36 is a region showing a shadow sandwiched between the pair of virtual lines L2 and L3. As described above, in the reflection region M2 of the reflection surface 33a, the coverage of the region sandwiched between the pair of virtual lines L2 and L3 is higher than that of the other regions. In the first modification, the coverage of the region superimposed on the shadow is constant, and the coverage of the other regions is also constant.

Here, the coverage is the ratio of the portion occupied by the plurality of recesses 37 per unit area. When the plurality of recesses 37 have the same shape, the coverage can be said to be the density of the recesses 37. It is also possible to adjust the coverage by changing the size of the recess 37. In the portion where the coverage is high, a large amount of light is reflected toward the exit surface 32 by the plurality of recesses 37, so that the brightness is increased. That is, even if a shadow is generated, the brightness is increased in the region, so that the difference in brightness from the other regions is small. Therefore, the uniformity of light on the exit surface 32 of the light guide plate 30 can be further improved.

[Modification 2]
FIG. 8 is an enlarged view showing a part of the light guide plate 30B according to the second modification. FIG. 8 is a diagram corresponding to FIG. 7. In the first modification, a case where the coverage of the region superimposed on the shadow is constant has been illustrated. In this modification 2, the case where the coverage of the region superimposed on the shadow is changed depending on the location is illustrated.

Here, the shadow caused by the through hole 36 becomes thinner as the distance from the incident surface 31 increases. That is, in the portion far from the incident surface 31, the difference in brightness from the other regions becomes small. Therefore, in the region overlapping the shadow of the through hole 36 on the reflecting surface 33b of the light guide plate 30B, the covering ratio is lowered as the distance from the incident surface 31 increases to suppress uneven brightness in the shadow extending direction. In this case, the lower limit of the coverage may be set to a value that reflects the light in the light guide plate 30B without uneven brightness. That is, it is better not to reduce the coverage to zero.

Further, at both ends of the region superimposed on the shadow, the shadow is faded by the light from the other region, and the difference in brightness from the other region is small. Therefore, the luminance unevenness in the width direction of the shadow is suppressed by increasing the coverage in the central portion of the region overlapping the shadow and lowering the coverage in both end portions as compared with the central portion. Further, the coverage does not change sharply at the boundary portion between the region superimposed on the shadow and the other region (the portion near the pair of virtual lines L2 and L3). As a result, it is possible to suppress a sense of discomfort due to the difference in coverage between the region superimposed on the shadow and the other region.

In the second modification, both the measures against the uneven brightness in the extending direction of the shadow and the measures against the uneven brightness in the width direction of the shadow are taken as an example, but even if only one of the measures is taken. good.

[Modification 3]
FIG. 9 is an enlarged view showing a part of the light guide plate 30C according to the modified example 3. FIG. 9 is a diagram corresponding to FIG. 7. In the first modification, a case where the coverage is different inside and outside the region superimposed on the shadow is illustrated. In this modification 3, the case where the coverage is changed depending on the location regardless of the region superimposed on the shadow is illustrated.

As shown in FIG. 9, in the reflecting surface 33c of the light guide plate 30C according to the modified example 3, a plurality of recesses 37 are arranged so as to form a horizontal stripe pattern in a portion close to the incident surface 31. Specifically, the plurality of recesses 37 of each row in the portion close to the incident surface 31 have a wider row spacing than the other portions. As described above, the shadow caused by the through hole 36 becomes thinner as the distance from the incident surface 31 increases. Therefore, if a pattern that can be visually recognized only in the portion close to the incident surface 31 is formed by the plurality of recesses 37, the user can be given the illusion that the pattern is conspicuous and no shadow exists.

If the pattern formed by the plurality of recesses 37 can give the illusion that no shadow exists, the plurality of recesses 37 may form a pattern other than that illustrated in the third modification.

[Modification example 4]
In the above embodiment, the case where the light guide plate 30 has a flat plate shape is illustrated. In this modification 4, the case where the end portion of the light guide plate 30D on the incident surface side is bent will be described as an example.

FIG. 10 is a cross-sectional view of the lighting device 10D according to the modified example 4. As shown in FIG. 10, the light guide plate 30D provided in the lighting device 10D has an end portion on the incident surface 31 side bent, and the incident surface 31 faces downward. The light emitting module 15 is installed on the bottom surface of the light guide plate support portion 21 so that the plurality of light sources 152 face the incident surface 31 of the light guide plate 30D.

In the facing region H1 in the above embodiment, the case where the plurality of light sources 152 and the through holes 36 are linearly opposed to each other is illustrated, but in the facing region according to the modification 4, the plurality of light sources 152 and the through holes 152 penetrate. The holes 36 are curvedly opposed to each other. In any case, in the facing region, the plurality of light sources 152 and the through holes 36 face each other in the traveling direction of the light incident on the light guide plates 30 and 30D from the incident surface 31. The lighting device 10D according to the fourth modification can also have the same effect as the lighting device 10 according to the above embodiment.

[others]
The lighting device 10 and the light guide plate 30 according to the present invention have been described above based on the above-described embodiments and modifications 1 to 4, but the present invention is limited to the above-described embodiments and modifications 1 to 4. It's not something.

For example, in the above embodiment, the case where the light source 152 is not mounted as the unmounted region H2 is exemplified in the region facing the through holes 36 at both ends among the plurality of through holes 36. However, the region facing the through holes 36 at both ends may also be a facing region in which the light source 152 is arranged more densely than the non-facing regions h1 and h2. Thereby, it is possible to suppress the generation of shadows caused by the through holes 36 at both ends.

Further, in the above embodiment, a case where a plurality of light sources 152 are arranged more densely than the non-opposing regions h1 and h2 in all three facing regions H1 is illustrated, but in at least one facing region H1. It suffices that the plurality of light sources 152 are arranged more densely than the non-opposing regions h1 and h2.

Further, in the above embodiment, a case where a plurality of light sources 152 arranged in the non-opposing regions h1 and h2 are arranged so that the distance between them increases as the distance from the facing region H1 increases is illustrated. However, in the non-opposing regions h1 and h2, the layout of the plurality of light sources 152 may be arbitrary as long as the density is smaller than that of the facing regions H1. For example, in the non-opposing regions h1 and h2, a plurality of light sources 152 may be arranged at equal intervals.

In addition, it is realized by arbitrarily combining the components and functions in each embodiment within the range obtained by applying various modifications to each embodiment and the gist of the present invention. Forms are also included in the present invention.

10, 10D Lighting device 30, 30A, 30B, 30C, 30D Light guide plate 31 Incident surface 32 Exit surface (surface)
33, 33a, 33b, 33c Reflective surface (back surface)
36 Through hole 37 Recessed 152 Light source h1, h2 Non-opposing area H1 Opposing area L Light M1 Mixing area S1, S2 Shadow

Claims (9)

It has a front surface, a back surface opposite to the front surface, and an incident surface on which light is incident, guides the light incident from the incident surface, and reflects the light at a plurality of recesses formed on the back surface. , A light guide plate that emits light from the surface,
A plurality of light sources arranged along the extending direction of the incident surface so as to incident light on the incident surface are provided.
At the end of the light guide plate on the incident surface side, a plurality of through holes penetrating from the front surface to the back surface are arranged along the incident surface.
In the facing region facing at least one of the plurality of through holes via the incident surface, the plurality of light sources are arranged more densely than in the non-opposing region .
An illuminating device in which the distance between adjacent light sources in the facing region is smaller than the diameter of the through hole. A plurality of light sources arranged in the opposite region are arranged at equal intervals, and the light sources are arranged at equal intervals.
The lighting device according to claim 1, wherein the plurality of light sources arranged in the non-opposing region are arranged so that the distance between the light sources increases as the distance from the facing region increases. Of the plurality of light sources, the light sources at both ends in the extending direction have shadows formed when light is applied to the through holes at both ends of the plurality of through holes in the mixing region of the light guide plate. The lighting device according to claim 1 or 2, which is arranged at a position where it fits. The third aspect of claim 3, wherein in the plurality of facing regions facing the through holes other than the through holes at both ends, the plurality of light sources are arranged more densely than the non-opposing regions. Lighting device. The coverage of the plurality of recesses on the back surface is higher than that of the other regions in the region superposed on the shadow of the through hole formed by the light from each of the plurality of light sources. The lighting device according to paragraph 1. The lighting device according to any one of claims 1 to 5, wherein the coverage of the plurality of recesses on the back surface decreases as the distance from the incident surface side increases. It has a front surface, a back surface opposite to the front surface, and an incident surface on which light is incident, guides the light incident from the incident surface, and reflects the light at a plurality of recesses formed on the back surface. , A light guide plate that emits light from the surface,
A plurality of light sources arranged along the extending direction of the incident surface so as to incident light on the incident surface are provided.
At the end of the light guide plate on the incident surface side, a plurality of through holes penetrating from the front surface to the back surface are arranged along the incident surface.
In the facing region facing at least one of the plurality of through holes via the incident surface, the plurality of light sources are arranged more densely than in the non-opposing region.
Of the plurality of light sources, the light sources at both ends in the extending direction have shadows formed when light is applied to the through holes at both ends of the plurality of through holes in the mixing region of the light guide plate. It is placed in a position where it fits
Lighting device. It has a front surface, a back surface opposite to the front surface, and an incident surface on which light is incident, guides the light incident from the incident surface, and reflects the light at a plurality of recesses formed on the back surface. , A light guide plate that emits light from the surface,
A plurality of light sources arranged along the extending direction of the incident surface so as to incident light on the incident surface are provided.
At the end of the light guide plate on the incident surface side, a plurality of through holes penetrating from the front surface to the back surface are arranged along the incident surface.
In the facing region facing at least one of the plurality of through holes via the incident surface, the plurality of light sources are arranged more densely than in the non-opposing region.
The coverage of the plurality of recesses on the back surface is higher in the region superposed on the shadow of the through hole formed by the light from each of the plurality of light sources than in the other regions.
Lighting device. It has a front surface, a back surface opposite to the front surface, and an incident surface on which light is incident, guides the light incident from the incident surface, and reflects the light at a plurality of recesses formed on the back surface. , A light guide plate that emits light from the surface,
A plurality of light sources arranged along the extending direction of the incident surface so as to incident light on the incident surface are provided.
At the end of the light guide plate on the incident surface side, a plurality of through holes penetrating from the front surface to the back surface are arranged along the incident surface.
In the facing region facing at least one of the plurality of through holes via the incident surface, the plurality of light sources are arranged more densely than in the non-opposing region.
The coverage of the plurality of recesses on the back surface decreases as the distance from the incident surface side increases.
Lighting device.

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