JP2019102163A - Luminaire - Google Patents

Abstract

To provide a luminaire which is smaller than a conventional luminaire, and which can make luminance of the entire surface on the front side even more uniform.SOLUTION: A luminaire 1 includes: a plurality of surface light sources 100 in which the surface light sources 100 for emitting light at least from a central part 112 and a peripheral edge part 114 of a light emission surface 110 are arranged so as to come into contact and be adjacent to each other on side surfaces 120 of the surface light sources 100; and a light transmitting plate 200 placed on the light emission surface 110 side of the plurality of surface light sources 100, and having a first main surface 210 where light emitted from the light emission surface 110 of the surface light sources 100 enters, and a second main surface 220 which is the surface on the opposite side from the first main surface 210 and where the light which has entered from the first main surface 210 emits. A gap between the peripheral edge part 114 and the first main surface 210 of the light transmitting plate 200 is defined as D1, and a gap between the central part 112 of the light emission surface 110 of the surface light source 100 and the first main surface 210 of the light transmitting plate 200 is defined as D2, substantially the relationship of D1=D2=0 mm is established.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device.

  In recent years, a lighting apparatus using a flat plate with a relatively large area has attracted attention. For example, a light transmitting plate on which a desired character, figure, picture, photograph, etc. (these are collectively referred to as "pattern") are printed in advance is disposed on the front side of the lighting device, and the light transmitting plate An illumination device capable of emitting light from the front side while arranging a light source on the back side of the illumination device and irradiating the light transmitting plate with light from the light source to make the design float up It has been known. Such a lighting device is being widely used, for example, as an advertising medium and as a material of interiors, and the demand is increasing.

FIG. 11 is a cross-sectional view of a lighting device 800 shown to explain the conventional lighting device 800. As shown in FIG. The arrows in the figure are for illustratively explaining a part of the light traveling in the illumination device 800, and the direction of the arrows indicates the traveling direction of the light for the sake of convenience.
The conventional lighting device 800 includes a plurality of light emitting sources 840 and a light transmitting plate 200, as shown in FIG.
The plurality of light emitting sources 840 are discretely arranged in a plane, and are housed inside the exterior case 870. Each light emission source 840 is composed of a point light source (bulb, LED (Light Emitting Diode), etc.) or a linear light source (fluorescent tube, etc.).
The light transmitting plate 200 has a first major surface 210 on which light emitted from a plurality of light emitting sources 840 is incident, and light which is a surface opposite to the first major surface 210 and which is incident from the first major surface 210 Has a second main surface 220 from which light is emitted. The light transmitting plate 200 is fixed to the exterior case 870 such that the second main surface 220 appears to the outside. The light transmitting plate 200 is made of, for example, an acrylic plate. A symbol layer 300 representing a symbol may be added to the second main surface 220 side.
According to the conventional lighting device 800, even if the light transmitting plate 200 has a relatively large area, the light transmitting plate 200 is irradiated with light by the plurality of light emitting sources 840. Light can be emitted from the entire second main surface 220 while brightening the entire second main surface 220 brightly. The illumination device 800 having such a configuration is used, for example, as a billboard for advertisement.

  However, in the conventional lighting device 800, the light sources are point light sources or line light sources, and these light sources are discretely arranged. Therefore, there is a problem that uneven brightness appears in a prominent manner on the front surface side of the lighting device 800 (the second main surface 220 of the light transmitting plate 200).

Another conventional illumination device has also been proposed to address such problems (see, for example, Patent Document 1).
FIG. 12 is a figure shown in order to demonstrate another conventional illuminating device 900. As shown in FIG. FIG. 12A is a perspective view showing a state before the lighting device 800 is assembled. FIG.12 (b) is principal part sectional drawing which represented center part vicinity of the illuminating device 800 when the illuminating device 800 is cut | disconnected along the II 'line of Fig.12 (a). Reference numerals 942a, 942b, and 942c indicate circuit boards, and 990 indicates an auxiliary diffusion member.

Another conventional lighting device 900 comprises a surface light source 910 and a light transmitting plate 200, as shown in FIG. In the surface light source 910 used in another conventional lighting device 900, two light guide plates 930a and 930b having first light emitting surfaces 934a and 934b are disposed adjacent to each other with the light emission source 940a interposed therebetween. Become. On the other hand, the light transmitting plate 200 is disposed on the side of the light emitting surface (the first light emitting surfaces 934 a and 934 b) of the surface light source 910. The light transmitting plate 200 has a first major surface 210 on which light emitted from the light emitting surface (first light emitting surfaces 934 a and 934 b) of the surface light source 910 is incident, and a surface opposite to the first major surface 210. And has a second major surface 220 from which light incident from the first major surface 210 is emitted.
According to another conventional lighting device 900, since the surface light source 910 is used, the surface on the front side of the lighting device (the second main surface 220 of the light transmitting plate 200) is compared to the conventional lighting device 800. Uneven luminance that appears can be alleviated.

JP 2011-203735 A JP, 2014-150049, A

However, the light guide plate 930a and the light guide plate 930b of another conventional illumination device 900 are disposed apart from each other with the light emitting source 940a interposed therebetween, in other words, between the light guide plate 930a and the light guide plate 930b Requires a space for disposing the light emitting source 940a. Therefore, in the case of another conventional lighting device 900, the size in the longitudinal direction increases at least in the space, and the entire size also increases.
In addition, another conventional lighting device 900 is a surface light source provided by a support member 980 in order to alleviate unevenness in luminance of the entire front surface of the lighting device 900 (entire second main surface 220 of the light transmitting plate 200). A gap is provided between the surface 910 and the light transmitting plate 200 over the entire surface. Therefore, in the lighting device 900, the dimension in the thickness direction increases at least for the gap, and the overall size also increases.

  Therefore, the present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a lighting device that is smaller than a conventional lighting device and that can further equalize the luminance of the entire front surface. .

[1] In the first lighting device of the present invention, surface light sources emitting light from at least a central portion and a peripheral portion of a light emitting surface are disposed adjacent to each other while being in contact with each other at the side portions of the surface light source. A plurality of the surface light sources, a first main surface which is placed on the light emission surface side of the surface light sources and into which light emitted from the light emission surface of the surface light sources is incident; A light transmitting plate having a second main surface from which the light incident from the first main surface is emitted, the peripheral surface portion of the light emitting surface of the surface light source; And a gap between the peripheral portion located on the side adjacent to another surface light source and the first main surface of the light transmitting plate is D1, and the light emitting surface of the surface light source is When a gap between the central portion and the first main surface of the light transmitting plate is D2, substantially D1 = D2 = 0 mm Characterized in that in the engagement.

[2] In the first illumination device of the present invention, the surface light source is a light source having an end face and a first light emitting surface, and a light emitting source disposed so as to face the end face and emitting light toward the end face And a first light incident surface disposed on the side of the first light emission surface of the light guide plate, on which the light emitted from the first light emission surface is incident, and light emitted from the first light incident surface are emitted. And a light diffusion plate having a second light emission surface, wherein the light diffusion plate protrudes toward the light guide plate, and faces at least the light emission source among peripheral portions of the first light emission surface of the light guide plate. It is provided in the position which counters the above-mentioned peripheral part by the side of the above-mentioned end, and has the convex streak which has the 2nd light incidence surface into which the light emitted from the above-mentioned peripheral part of the above-mentioned 1st light emission surface enters The second light exit surface of the diffuser plate constitutes the light exit surface of the surface light source, and the light It is preferable that the outer peripheral end face of the diffusion plate constitutes an outer peripheral end surface of the surface light source.

[3] In the second lighting device of the present invention, the surface light sources emitting light from at least the central portion and the peripheral portion of the light emitting surface are disposed adjacent to each other while being in contact with each other at the side portions of the surface light source. A plurality of the surface light sources, a first main surface which is placed on the light emission surface side of the surface light sources and into which light emitted from the light emission surface of the surface light sources is incident; A light transmitting plate having a second main surface from which the light incident from the first main surface is emitted, the peripheral surface portion of the light emitting surface of the surface light source; And a gap between the peripheral portion located on the side adjacent to another surface light source and the first main surface of the light transmitting plate is D1, and the light emitting surface of the surface light source is When a gap between the central portion and the first main surface of the light transmitting plate is D2, substantially D1> D2 ≧ 0 mm Characterized in that in the engagement.

[4] In the second illumination device of the present invention described in [3], an inclined portion connecting the light emitting surface and the side portion is provided at the peripheral portion of the light emitting surface of the surface light source. Is preferred.

[5] In the second illumination device of the present invention described in the above-mentioned [3] or [4], the surface light source is disposed so as to face the end surface and a light guide plate having an end surface and a first light emitting surface, A light emitting source for emitting light toward the end face; a first light incident surface which is disposed on the side of the first light emitting surface of the light guide plate and on which the light emitted from the first light emitting surface is incident; 1) A light diffusion plate having a second light emission surface from which light incident from the light incidence surface is emitted, the light diffusion plate protrudes toward the light guide plate, and the first light emission surface of the light guide plate It has a second light incident surface which is provided at a position facing at least the peripheral edge on the end face side facing the light emission source among the peripheral edges of the light emitting device and the light emitted from the peripheral edge of the first light emitting surface is incident The second light emitting surface of the light diffusing plate is a surface light source. Configure the serial light emitting surface, it is preferable that the outer peripheral edge surface of the light diffuser plate constitutes the outer peripheral edge surface of the surface light source.

[6] In the second illumination device of the present invention described in the above-mentioned [3], the surface light source is disposed to face the end surface and the light guide plate having the end surface and the first light emitting surface, A light emitting source for emitting light and a first light incident surface which is disposed on the side of the first light emitting surface of the light guide plate and on which the light emitted from the first light emitting surface is incident; and the first light incident surface And a light diffusion plate having a second light emission surface from which light incident from the light source exits, the second light emission surface of the light diffusion plate constituting the light emission surface of the surface light source, and the light diffusion surface The outer peripheral end face of the plate constitutes at least a part of the outer peripheral end face of the surface light source, and the light diffusion plate protrudes toward the light guide plate, and at least the light emission of the peripheral portion of the first light emission surface of the light guide plate Provided at a position opposite to the peripheral edge on the end face side facing the source, the first light emitting surface The light diffusion plate has a ridge portion having a second light incident surface on which light emitted from the peripheral portion is incident, and the light diffusion plate is connected to a light emitting front surface and an outer peripheral end surface constituting the second light emitting surface. An inclined portion is provided, and the convex streak portion of the light diffusion plate is cut at a plane orthogonal to the light emission front surface and orthogonal to the outer peripheral end face, and the cross section of the convex streak portion is viewed; The thickness of the ridge in the direction perpendicular to the outer peripheral end surface is defined as W, and the height of the ridge from the second light incident surface to the light emission front in the direction perpendicular to the light emission front is Defined as H, the length between the intersection of the virtual extension of the light emission front and the virtual extension of the outer peripheral end and the point at which the light emission front is switched to the inclined portion is defined as M; When the length between the outer peripheral end face and the point where it switches to the inclined portion is defined as L,
(3/10) W M M ((15/10) W and (2/10) H L L ≦ (9/10) H
Preferably, the inclined portion is formed to satisfy the following relationship.

[7] In the second lighting device according to the above [6],
(5/10) W M M ((13/10) W and (5/10) H L L ((8/10) H
More preferably, the inclined portion is formed to satisfy the following relationship.

[8] In the second illumination device according to the above [3] to [7], when the surface light source is placed on a horizontal surface, the height of the central portion of the light emission surface is the light emission surface Preferably, it is configured to be higher than the height of the peripheral portion.

[9] In the first lighting device according to the above [1] and [2], and the second lighting device according to the above [3] and [8], the light transmitting plate is welded by a solvent It is preferable that the surface light source be placed on the surface light source.

According to the first illumination device of the present invention, the light source which illuminates the light transmitting plate from the first main surface (rear surface) is a surface light source which is neither a point light source nor a line light source like a conventional illumination device, Moreover, since the surface light source (so-called "edgeless" surface light source) which emits light not only from the central portion but also from the peripheral portion is used as the surface light source, the luminance of the entire second main surface of the light transmitting plate Can be even more uniform.
In addition, since the plurality of surface light sources are disposed adjacent to each other while being in contact with each other at the side portions, it is not necessary to provide a special gap between the surface light sources.
Further, a gap between a peripheral edge portion located on the side adjacent to another surface light source among the peripheral edge portions of the light emission surface of the surface light source and the first main surface of the light transmitting plate is D1. When the gap between the central portion of the light emitting surface of the light emitting element and the first main surface of the light transmitting plate is D2, the relationship of D1 = D2 = 0 mm is substantially established. For this reason, it is not necessary to provide a special gap between the entire light emitting surface of the surface light source and the first main surface of the light transmitting plate, and the size in the thickness direction can be minimized.
Therefore, according to the first illumination device of the present invention, the illumination device is smaller than the conventional illumination device, and the illumination device can make the luminance of the entire surface on the front side even more uniform.

According to the second lighting device of the present invention, an air layer having such a thickness D1 is provided, which is substantially in the relationship of D1> D200 mm. For this reason, a part of the light emitted from the peripheral portion of the light emission surface of the surface light source can be made to enter the light transmitting plate after passing through the air layer, without directly entering the light transmitting plate. . That is, a part of the light emitted from the peripheral portion is appropriately scattered while being refracted at the interface between the light emitting surface of the surface light source and the air layer, and at the interface between the air layer and the light transmitting plate. Can be scattered appropriately as well.
For this reason, according to the second illumination device of the present invention, in addition to the effect of the first illumination device, the luminance becomes high or low at the peripheral portion of the light emission surface of the surface light source that is abutted Even in this case, the difference in luminance on the second main surface of the light transmitting plate can be reduced (the so-called sharp luminance edge can be blurred).
Therefore, according to the first illumination device of the present invention, the illumination device is smaller than the conventional illumination device, and the illumination device can make the luminance of the entire surface on the front side even more uniform.

BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a view for explaining an illumination device 1 according to a first embodiment. FIG. 2 is a view for explaining a surface light source 100a / 100b of the first embodiment. It is a figure shown in order to demonstrate the illuminating device 2 which concerns on Embodiment 2, and the surface light source 102a / 102b of Embodiment 2. FIG. FIG. 13 is a view for explaining variations of the inclined portion of the light diffusing plate in the second embodiment. FIG. 16 is a cross-sectional view of main parts of the light diffusion plate 150 shown to explain the size, angle, and the like of the inclined portion 116 of the light diffusion plate 150 according to the second embodiment. It is a figure shown in order to demonstrate the illuminating device 3 which concerns on Embodiment 3. FIG. It is a figure shown in order to demonstrate the illuminating device 4 which is a modification of the illuminating device which concerns on Embodiment 3. FIG. It is a figure shown in order to demonstrate the illuminating device 5 which concerns on the modification 1. FIG. It is a figure shown in order to demonstrate the illuminating device 6 which concerns on the modification 2. FIG. It is a figure shown in order to demonstrate the illuminating device 7 which concerns on the modification 3. FIG. FIG. 10 is a cross-sectional view of a lighting device 800 shown to explain the conventional lighting device 800. It is a figure shown in order to demonstrate another conventional illuminating device 900. FIG.

  Hereinafter, the illumination device of the present invention will be described in detail based on the embodiments shown in the drawings. Each drawing is a schematic view, and the dimensions, angles, etc. of each component do not necessarily reflect the actual ones exactly.

Embodiment 1
1. Basic Configuration of Lighting Device 1 According to Embodiment 1 FIG. 1 is a view for explaining the lighting device 1 according to the embodiment 1. As shown in FIG. FIG. 1A is a perspective view showing a state before the lighting device 1 is assembled. FIG. 1B is a perspective view of the entire lighting device 1 when it is viewed in perspective. FIG.1 (c) is sectional drawing when the lighting device 1 is cut | disconnected along the AA of FIG.1 (b), and the cross section is seen. FIG.1 (d) is principal part sectional drawing which expanded the part enclosed with the dotted line in FIG.1 (c). In the description, when the surface light source 100 having the two surface light sources 100a / 100b and the light transmitting plate 200 are stacked, the side on which the light transmitting plate 200 is disposed is referred to as “front side” or “side”. The side on which the surface light source 100 is disposed may be referred to as “back side” or “down”. Further, in the following description, the term "surface light source (symbol 100 in FIG. 1)" may be used to indicate the entire body of a plurality of surface light sources (the surface light sources 100a and 100b correspond to this in FIG. 1). For example, each of the surface light sources may be referred to as “surface light source (symbol 100a or 100b in FIG. 1)”.

  The illuminating device 1 which concerns on Embodiment 1 is provided with the surface light source 100 and the light transmissive board 200 mounted on the surface light source 100, as shown in FIG.

(1) Surface light source 100
The surface light source 100 includes a surface light source 100a and a surface light source 100b. Each of the surface light sources 100a / 100b emits light from at least the central portion 112 and the peripheral portion 114 of the light emission surface 110. The surface light sources 100a / 100b are disposed adjacent to each other while being in contact with each other at the side portions 120 of the surface light sources 100a / 100b. In FIG. 1, the surface light source 100a disposed on the right side and the surface light source 100b disposed on the left side can adopt the configuration common to both of them, and therefore, it is shown in FIG. In the description of each embodiment, the description may be omitted for one surface light source.

  The surface light source 100a / 100b may have any internal configuration as long as it emits light not only from the central portion 112 but also from the peripheral portion 114 of the light emitting surface 110.

(2) Light transmitting plate 200
The light transmitting plate 200 is placed on the light emitting surface 110 side of the surface light source 100. The light transmitting plate 200 has a first major surface 210 on which light emitted from the light emitting surface 110 of the surface light source 100 is incident, and a surface on the opposite side to the first major surface 210 and is the first major surface It has a second major surface 220 from which light incident from 210 is emitted.
The second main surface 220 of the light transmitting plate 200 constitutes a “surface on the front side of the lighting device 1”. Therefore, the uniformity of the luminance of the entire surface on the front side of the lighting device 1 can be grasped by observing the entire second main surface 220.

The light transmitting plate 200 is a light transmitting plate. As long as it has optical transparency, it may be opaque or opaque. As the light transmitting plate 200, for example, acrylic, polycarbonate, other resin in general, glass or the like can be adopted. The non-transparent light transmitting plate 200 may be configured, for example, by including light scattering particles in these members. When light scattering particles are used, the absorption of light by the inclusions is small as compared to the case where colored particles such as pigments are contained, so that the light emitted from the second major surface 220 due to the absorption of light of the inclusions It is possible to suppress the decrease in the amount of emitted light. In addition, the light incident on the inside of the light transmitting plate 200 is scattered by the light scattering particles, so that the difference in the amount of light emitted from the second major surface 220 by the light emission location becomes smaller and becomes uniform. Uneven luminance of light emitted from the second major surface 220 is suppressed. Furthermore, if there are no light scattering particles, the light totally reflected on the second major surface 220 is scattered inside the light transmitting plate 200 by the light scattering particles to become scattered light, and some of the scattered light is The light is emitted from the second main surface 220 which is an output surface without being totally reflected by the two main surfaces 220. This makes it possible to suppress the absorption of light by a material such as an optical resin forming the light transmitting plate 200 which is generated by repeating total reflection inside the light transmitting plate 200, and from the second major surface 220 The emitted light quantity of the emitted light can be increased.
The shape of the light transmitting plate 200 is a plate. For example, it may be a plate that is completely flat. Moreover, the board which has a curved surface part may be sufficient.

(3) Pattern layer 300
In the lighting device 1 according to the first embodiment, the design layer 300 may be further provided on the second main surface 220 of the light transmitting plate 200.
The pattern layer 300 can be formed of a printing material such as ink, a coating material, a plate on which a pattern is drawn, or the like. Moreover, what formed the design directly on the 2nd main surface 220 of the transparent board 200 by methods, such as a laser marking, shall be included in the design layer 300 here.

(4) Relationship between the plurality of surface light sources 100 and the light transmitting plate 200 Of the peripheral portions 114 of the light emitting surface 110a of the surface light source 100, the peripheral portion 114 located on the side adjacent to the surface light source 100b In the peripheral portion 114 of the light emitting surface 110 of the surface light source 100a disposed on the right side in 1, the “peripheral portion 114a” located on the side adjacent to the surface light source 100b is referred to herein as A gap between the transparent plate 200 and the first main surface 210 is denoted by D1 (see FIG. 1 (d)).
Further, a gap between the central portion 112 of the light emitting surface 110 of the surface light source 100a / 100b and the first major surface 210 of the light transmitting plate 200 is D2.
When the distance D1 and the distance D2 are defined as described above, in the lighting device 1 according to the first embodiment, the relationship of D1 = D2 = 0 mm is substantially satisfied.
That is, although the light transmitting plate 200 is mounted on the surface light source 100a / 100b in the lighting device 1, the light transmitting plate 200 is also used in the central portion 112 and the peripheral portion 114 of the surface light source 100a / 100b. It can be said that there is no substantial gap with the first main surface 210, and the surface light source 100a / 100b and the light transmitting plate 200 are superimposed.
For example, it is assumed that the first major surface 210 of the light transmitting plate 200 is flat. In this case, the light emitting surface 110 including the peripheral portion 114 and the central portion 112 of the one surface light source 100a adjacent to each other, and the light emitting surface 110 including the peripheral portion 114 and the central portion 112 of the other surface light source 100b are substantially The peripheral surface 114 and the central portion 112 of the surface light source 100a / 100b are in contact with the first main surface 210 of the light transmitting plate 200.

2. Detailed Configuration of Surface Light Source 100a / 100b The surface light source 100a / 100b may emit light not only from the central portion 112 of the light emitting surface 110 but also from the peripheral portion 114 as described above. It may be one. However, it is more preferable that the surface light source 100a / 100b have the following configuration.

  FIG. 2 is a figure shown in order to demonstrate an example of a concrete structure of the surface light source 100a / 100b of Embodiment 1. FIG. 2 (a) is a plan view of the surface light source 100a / 100b as viewed from the front side, and FIG. 2 (b) is a plan view of the surface light source 100a / 100b along the line A-A in FIG. 2 (a). It is principal part sectional drawing of the left side when it cuts and it looks at the cross section. The dotted line in FIG. 2 (b) is for illustratively explaining the traveling path of a part of the light traveling in the lighting device 800, and the direction of the arrow indicates the traveling direction of the light for convenience. It is shown in.

  The surface light source 100a / 100b includes at least a light guide plate 130, a light emission source 140, and a light diffusion plate 150, as shown in FIG.

(1) Light guide plate 130
The light guide plate 130 guides the light incident from the end surface 132 with a planar spread. The light guide plate 130 is flat and has an end surface 132 and a first light emission surface 134. Further, the light guide plate back surface 136 is provided on the opposite side to the first light emission surface 134.
The end surface 132 is a surface on which the light emitted from the light emitting source 140 is incident. The first light emission surface 134 is a light emission surface that emits light from the light guide plate 130 to the light diffusion plate 150. The light guide plate back surface 136 is in close contact with a reflection plate 160 described later, and the light guide plate back surface 136 functions as a light reflection surface traveling inside the light guide plate 130.
The light guide plate 130 is made of, for example, an acrylic resin having a relatively high light transmittance, and contains light scattering particles therein as needed. The end surface 132 may be configured in a straight line so as to form the side of the outer periphery of the light guide plate 130 when the light guide plate 130 is viewed from the front (see FIG. 2A). <<>> In addition, a part of the side of the surface light source is partially recessed toward the central portion (not shown), and the light source 140 is disposed in the recessed recess, and the surface facing the recessed recess is displayed. The end surface 132 may be configured.

(2) Light emission source 140
The light emission source 140 emits light for a lighting device, is disposed to face the end face 132 of the light guide plate 130 described above, and emits light toward the end face 132.
For example, an LED can be employed as the light source 140.
A plurality of light emitting sources 140 are arranged along the end face 132 of the light guide plate 130 at a substantially constant interval. The light emission source 140 is disposed in the thickness range of the light guide plate 130, but may be disposed substantially at the center of the light guide plate 130 in the thickness direction. By disposing in the center, the amount of light emitted to the outside is increased as compared with the case of not disposing in the center.
Although FIG. 2A illustrates the case where seven light emitting sources 140 are disposed on each of the left side and the right side of the light guide plate 130, the number of light emitting sources 140 is the same as that of the surface light source 100. It is appropriately selected according to the plane size, the required brightness and the like.

(3) Light diffusion plate 150
The light diffusion plate 150 is disposed on the side of the first light emission surface 134 of the light guide plate 130. The light diffusion plate 150 has a first light incident surface 151 on which the light emitted from the first light emission surface 134 is incident and a second light emission surface 152 on which the light incident from the first light incident surface 151 is emitted. The second light exit surface 152 corresponds to the light exit surface 110 described above.
The light diffusion plate 150 may be anything as long as it promotes the uniformity of the luminance distribution of light, but a light scattering light guide containing a large number of light scattering particles (not shown) is adopted. May be

(4) The ridges 155 of the light diffusion plate 150
In addition, the light diffusion plate 150 has a convex portion 155.
The ridges 155 are provided on the peripheral edge 154 of the light diffusion plate 150. The rim 154 corresponds to the rim 114 described above. Specifically, the ridges 155 protrude toward the light guide plate 130, and at least the peripheral edge 135 of the first light emitting surface 134 of the light guide plate 130 that faces the end surface 132 facing the light source 140 faces the peripheral edge 135. It is provided in the position. The ridge portion 155 has a second light incident surface 156 on which light emitted from the peripheral portion 135 of the first light emission surface 134 is incident.

The second light incident surface 156 of the ridge portion 155 is a shielding region B which is a region where the light shielding portion 172 shields the light emitted from the light emitting source 140 or the first light emitting surface 134 (in particular, the peripheral portion 135); And an incident area C which is an area which is incident without being blocked by the light shielding portion 172.
The light shielding portion 172 is disposed between the second light incident surface 156 of the convex ridge portion 155 and the peripheral portion 135 on the side where the light emitting source 140 of the light guide plate 130 is disposed. The amount of light incident on the two light incident surface 156 can be limited. The shielding area B has at least a width (width dimension in the left-right direction) in which the light emitted from the light emitting source 140 is not directly incident on the light diffusion plate 150 without passing through the light guide plate 130.
In the first embodiment, the width of the shielding area B (width in the left-right direction) and the width of the incident area C (width in the left-right direction) are the first light exit surface 134 to the second light incident surface 156. When the light incident on the second light exit surface 152 exits from the second light exit surface 152, the overall brightness of the second light exit surface 152 is set to approach uniformly. That is, the light that has entered the second light incident surface 156 from the first light output surface 134 mainly exits from the peripheral portion 154 of the second light output surface 152. The size of the shielding area B and the size of the incident area C are set such that the brightness of the peripheral portion 154 of the second light emitting surface 152 approaches the brightness of the inner side (central portion 153) than the peripheral portion 154 Be done. The central portion 153 corresponds to the central portion 112 described above.
In addition, the ridges 155 form an inner side surface 157 that forms an inner periphery connecting the second light incident surface 156 and the first light incident surface 151, the second light incident surface 156 and the second light output surface 152 (especially And an outer peripheral end surface 158 forming an outer periphery connecting the portion 154).
The inner side surface 157 and the outer peripheral end surface 158 totally reflect a part of the light incident from the second light incident surface 156 and guide the light within the ridge portion 155, thereby particularly the peripheral portion 154 of the second light emitting surface 152. It is possible to increase the amount of light emitted from the vehicle.
At the same time, a part of the light incident on the outer peripheral end surface 158 breaks the total reflection and exits from the outer peripheral end surface 158, so the incident light on the outer peripheral end surface 158 is increased by the total reflection on the inner side surface 157. It is possible to increase the light quantity of the emitted light.

(5) Reflector 160
The reflection plate 160 is disposed in close contact with the light guide plate back surface 136 of the light guide plate 130. The reflecting plate 160 reflects the light leaked to the light guide plate back surface 136 side among the light guided to the light guide plate 130 to the front side (the first light emitting surface 134 side).
The reflector 160 may be formed of a material having a relatively high reflectance, such as aluminum foil, for example. Note that, instead of the reflection plate 160, a reflection coating may be formed on the light guide plate back surface 136 side of the light guide plate 130.

(6) Frame 170
The frame 170 fixes the light guide plate 130, the light emission source 140, the reflection plate 160 and the like. The frame 170 may be formed by bending a metal plate.
The frame 170 includes a base 171 along the end face 132 of the light guide plate 130, a light shield 172 extending from the base 171 to the first light emission surface 134 of the light guide 130, and a light shield extended to the reflector 160. It has 173 and.
The frame 170 fixes the light guide plate 130 and the reflection plate 160 so as to sandwich the light guide plate 130 and the reflection plate 160 by the light shielding portion 172 and the light shielding portion 173.
The light shielding portion 172 has a light shielding function to prevent the light emitted from the light emission source 140 from entering the light diffusion plate 150 as it is, that is, the light of the light emission source 140 is arranged in the upper direction in the drawing than the light emission source 140. It has a light shielding function of preventing the light diffusion plate 150 from being directly incident. The light shielding portion 173 has a light shielding function of preventing the light from the light emitting source 140 from leaking to the outside on the back surface side of the reflecting plate 160.

(7) Others The outer peripheral end surface 158 of the light diffusion plate 150 corresponds to the side portion 120 of the surface light source 100a / 100b described above. The outer side surface 175 of the frame 170 may form part of the side portion 120 of the surface light source 100a / 100b so as to form the same plane as the outer peripheral end surface 158 of the light diffusion plate 150.
In addition, the outer peripheral end face 158 of the light diffusion plate 150 may protrude further to the outer peripheral side than the outer side surface 175 of the frame 170. In this case, when the outer peripheral end surface 158 corresponds to the side portion 120 and only the outer peripheral end surface 158 of the light diffusion plate 150 is adjacent when the surface light source 100a and the surface light source 100b are in contact with each other 120) and the contact surface.

  For components common to the prior art, for example, the same means as the means described in Patent Document 2 can be employed. The description of Patent Document 2 can be incorporated into the detailed description of the configuration, function, and the like of the component.

3. Integration of a plurality of surface light sources 100 and light transmitting plate 200 (1) Integration by welding The material constituting the light emitting surface 110 of the surface light sources 100a / 100b and the first main surface 210 of the light transmitting plate 200 When the light transmitting plate 200 is bonded to the surface light source 100a / 100b by a material (for example, an adhesive etc.) different from the material to be used, the light emitted from the light emitting surface 110 of the surface light source 100 is light. When traveling toward the first major surface 210 of the transmissive plate 200, light passes through a portion (such as an adhesive) of a material different from these materials, and unintended light attenuation, refraction, scattering, etc. It may also occur.
Therefore, when integrating the plurality of surface light sources 100 and the light transmitting plate 200, it is preferable to integrate them by welding without using an adhesive or the like.

(A) Welding by solvent The light transmitting plate 200 is preferably welded by a solvent and placed on the surface light source 100a / 100b. That is, the light transmitting plate 200 is made of the surface light source 100a by the solvent corresponding to the material of the light emitting surface 110 of the surface light source 100a / 100b or the solvent corresponding to the material of the first main surface 210 of the light transmitting plate 200. It is preferable to be welded and mounted on / 100b. By integrating the plurality of surface light sources 100a / 100b and the light transmitting plate 200 in this manner, it is possible to suppress the occurrence of the above-described unintended light attenuation, refraction, scattering, and the like.

(B) Welding by ultrasonic welding Further, without using a solvent, for example, the light emitting surface 110 of the surface light source 100a / 100b and the first main surface 210 of the light transmitting plate 200 are welded by ultrasonic welding. May be

(2) Integration by pressing the outer peripheral edge Alternatively, integration can be performed by mechanical method, not by welding. For example, a plurality of surface light sources 100a / 100b and the back surface side of the surface light sources 100a / 100b and the second main surface side of the light transmitting plate 200 are sandwiched between outer peripheral edges (not shown) of the lighting device 1 The light transmissive plate 200 may be fixed and integrated.

4. Operation and effect of the illumination device 1 according to the first embodiment (1) In the illumination device 1 according to the first embodiment, the surface light sources 100a / 100b emitting light from at least the central portion 112 and the peripheral portion 114 of the light emission surface 110 are The surface light sources 100a / 100b are mounted on the side of the light emission surface 110 of the plurality of surface light sources 100a / 100b disposed adjacent to each other while being in contact with each other and the side surfaces 120 of the surface light sources 100a / 100b. A first principal surface 210 on which light emitted from the light emission surface 110 of the surface light source 100a / 100b is incident, and light incident from the first principal surface 210 on the surface opposite to the first principal surface 210; And a light transmitting plate 200 having a second main surface 220 for emitting light.
Then, of the peripheral portion 114 of the light emission surface 110 of the surface light source 100a or the surface light source 100b (for example, considering the surface light source 100a disposed on the right side in FIG. Is the gap between the peripheral portion 114a or the peripheral portion 114b located on the side adjacent to the surface light source 100b disposed on the left) and the first major surface 210 of the light transmitting plate 200, When a gap between the central portion 112 of the light emitting surface 110 of the surface light source 100 and the first major surface 210 of the light transmitting plate 200 is D2, the relationship of D1 = D2 = 0 mm is substantially satisfied. That is, the entire surface of the light emitting surface 110 is in contact with the first major surface 210.

According to the illumination device 1 according to the first embodiment, the light source for illuminating the light transmitting plate 200 from the first main surface (rear surface) 210 is neither a point light source like the conventional illumination device 800 nor a line light source. Since it is a surface light source, a surface light source (so-called “edgeless” surface light source) that emits light not only from the central portion 112 but also from the peripheral portion 114 is used as the surface light source. The brightness of the entire second main surface 220 of 200 can be made even more uniform.
Further, according to the lighting device 1 according to the first embodiment, the surface light sources 100a and 100b can be disposed adjacent to each other while being in contact with each other at the side portions 120. There is no gap between the light exit surface 100 b and the light exit surface 110.
Further, the distance between the surface light source 100 and the light transmitting plate 200 is substantially in the relationship of D1 = D2 = 0 mm. That is, there is no gap between the entire light emitting surface 110 of the surface light source 100 and the first major surface 210 of the light transmitting plate 200. Thereby, the dimension of the thickness direction of an illuminating device can be made thin.
Therefore, according to the first embodiment, it is possible to provide the lighting device 1 which is smaller than the conventional lighting device and can further equalize the luminance of the entire front surface.

(2) Further, the surface light source 100a / 100b of the first embodiment is disposed to face the light guide plate 130 having the end face 132 and the first light emitting face 134 and the end face 132, and emits light toward the end face 132. The light source 140 is disposed on the side of the first light emission surface 134 of the light guide plate 130, and the light emitted from the first light emission surface 134 is incident from the first light incident surface 151 and the first light incident surface 151 And a light diffusion plate 150 having a second light exit surface 152 from which light is emitted.
The light diffusion plate 150 protrudes toward the light guide plate 130 and is provided at a position facing at least the peripheral edge 135 on the end surface 132 side facing the light emission source 140 among the peripheral edge 135 of the first light emission surface 134 of the light guide plate 130 And a ridge portion 155 having a second light incident surface 156 on which the light emitted from the peripheral portion 135 of the first light emission surface 134 is incident. The second light emitting surface 152 of the light diffusing plate 150 constitutes the light emitting surface 110 of the surface light source 100a / 100b, and the outer peripheral end face 158 of the light diffusing plate 150 constitutes the side portion 120 of the surface light source 100.

Since the surface light source 100a / 100b of the first embodiment has the above-described convex streaks 155 at the peripheral edge 154 of the light diffusion plate 150, the peripheral edge 154 of the light diffusion plate 150 (a portion immediately above the light emission source 140 Light), and the uniformity of the luminance of the entire light emitting surface 110 of the surface light source 100 can be improved.
Even if D1 = D2 = 0 mm is designed to miniaturize the lighting device 1, the second light transmitting plate 200 can be formed by using a surface light source for which the light is sufficiently transmitted to such a peripheral portion 154 as well. Equalization of the luminance of the entire main surface 220 (surface on the front side of the lighting device 1) can also be achieved.
Therefore, according to the first embodiment, it is possible to provide an illumination device that is smaller than the conventional illumination device and that can further equalize the luminance of the entire front surface.

Second Embodiment
FIG. 3 is a figure shown in order to demonstrate the illuminating device 2 based on Embodiment 2, and the surface light source 102a / 102b of Embodiment 2. FIG. Fig.3 (a) is sectional drawing of the illuminating device 2 (it is drawing corresponding to FIG.1 (c) of Embodiment 1). FIG.3 (b) is principal part sectional drawing which expanded the part enclosed with the dotted line in FIG. 3 (a). FIG. 3C shows a specific configuration of the surface light source 102, and only the surface light source 102a disposed on the right side in FIG. 3B is extracted and shown. In FIG. 3C, the description of a part of the portion common to the surface light source 100a / 100b of the first embodiment in FIG. 2B is omitted.
FIG. 4 is a figure shown in order to demonstrate the variation of the inclination part of the light diffusing plate in Embodiment 2. FIG. The reference numeral 155 ′ ′ indicates a ridge of the light diffusion plate 150.

  The illumination device 2 according to the second embodiment basically has the same configuration as the illumination device 1 according to the first embodiment, but it is between the light emitting surface of the surface light source and the first main surface of the light transmitting plate. The method of setting the gap is different from the lighting device 1 according to the first embodiment.

1. Relationship of D1> D2 ≧ 0 mm In the illumination device 2 according to the second embodiment, as shown in FIG. 3, the surface light sources 102 a / 102 b emitting light from at least the central portion 112 and the peripheral portion 114 of the light emitting surface 110 The plurality of surface light sources 102a / 102b disposed adjacent to each other while being in contact with each other at the side portions 120 of the surface light sources 102a / 102b and the light emission surfaces 110 of the plurality of surface light sources 102a / 102b A first main surface 210 on which light emitted from the light emission surface 110 of the surface light source 102a / 102b is incident, and light incident from the first main surface 210 on the surface opposite to the first main surface 210 And a light transmitting plate 200 having a second main surface 220 for emitting light.
Of the peripheral portion 114 of the light emission surface 110 of the surface light source 102a or the surface light source 102b, one surface light source (for example, when considering the surface light source 102a disposed on the right side in FIG. The gap between the peripheral edge 114a or the peripheral edge 114b located on the side of the side adjacent to the surface light source 102b disposed on the left side) and the first main surface 210 of the light transmitting plate 200 is D1. When the gap between the central portion 112 of the light emitting surface 110 of the light source 102 and the first major surface 210 of the light transmitting plate 200 is D2, the relationship of D1> D2 ≧ 0 mm is substantially satisfied. That is, compared to the gap between the central portion 112 of each of the surface light sources 102a / 102b and the first main surface 210 of the light transmitting plate 200, the surface light sources 102a / 102b are arranged adjacent to each other. The gap between the peripheral portion 114 of and the first major surface 210 of the light transmitting plate 200 is in a widely opened state.

  Generally speaking, when a plurality of surface light sources are arranged adjacent to each other while contacting each other at the side portions of the surface light source, depending on the conditions, the central portion of the peripheral portion of the light emitting surface of the surface light source with the side portions abutted The brightness may be higher than that. Depending on the conditions, the peripheral portion of the light emitting surface of the surface light source with the side portions abutted may be lower in luminance than the central portion. In any case, when light emitted from the peripheral portion is made to directly enter the light transmitting plate in such a situation, in the second main surface of the light transmitting plate, the brightness of the second main surface near the location corresponding to the peripheral portion The difference is noticeable, resulting in the problem of looking like bright or dark lines.

  In the lighting device 2 according to the second embodiment, the relationship of D1> D2 ≧ 0 mm is substantially satisfied. In other words, the central portion 112 of the light emitting surface 110 of the surface light source 102 and the peripheral portion 114 located on the side adjacent to another surface light source and the first main surface 210 of the light transmitting plate 200. A gap D1 larger than D2 (≧ 0 mm), which is a gap between the first main surface 210 of the light transmitting plate 200, is provided. That is, in the vicinity of the peripheral portion 114 of the surface light source 102 with which the side portion 120 is in contact, the so-called thickness D1 between the light emitting surface 110 of the surface light source 102 and the first main surface 210 of the light transmitting plate 200. "Air layer AL" is provided << See FIG. 3 (b). << >>

According to the lighting device 2 of the second embodiment, since the air layer AL having such a thickness D1 is provided, the light emission of the surface light sources 102a and 102b is substantially satisfied. A part of the light emitted from the peripheral portion 114 of the surface 110 can be made incident on the light transmitting plate 200 after passing through the air layer AL without being directly incident on the light transmitting plate 200. That is, a part of the light emitted from the peripheral portion 114 is refracted at the interface between the light emitting surface 110 of the surface light source 102a / 102b and the air layer AL and at the interface between the air layer AL and the light transmitting plate 200. However, the light can be appropriately scattered as well as when passing through the air layer AL.
For this reason, for example, even when the luminance is high or low at the peripheral portion of the light emission surface of the surface light source brought into contact as described in the above-mentioned problem, the second main The difference in luminance at the surface 220 can be blunted (a so-called sharp luminance edge can be blurred).
As a result, the luminance of the entire surface on the front side (the second main surface 220 side of the light transmitting plate 200) of the lighting device 2 can be made even more uniform.

2. Method of Realizing D1> D2 ≧ 0 mm As described above, the illumination device 2 according to the second embodiment substantially has a relationship of D1> D2 ≧ 0 mm. This may be realized in any way as long as the relationship of D1> D2 ≧ 0 mm is substantially established.

(1) Difference in Height of Light Emitting Surface of Surface Light Source When the surface light sources 102a and 102b are placed in a horizontal plane, the height of the central portion 112 of the light emitting surface 110 is equal to the peripheral portion 114 of the light emitting surface 110 It may be realized by configuring to be higher than the height of the inclined portion 116 described later.

  As described above, since the height of the central portion 112 of the light emission surface 110 of the surface light sources 102a / 102b is higher than the height of the peripheral portion 114 of the light emission surface 110, light is emitted onto the surface light sources 102a / 102b. By mounting the transmissive plate 200, the distance D1 can be easily formed between the peripheral portion 114 of the light emitting surface 110 and the first major surface 210 of the light transmissive plate 200.

(2) Configuration by Chamfering The peripheral portion of the surface light source may be realized by so-called "chamfering".
That is, the inclined portion 116 connecting the light emitting surface 110 constituting the light emitting surface 110 and the side portion 120 is provided on the peripheral portion 114 of the light emitting surface 110 of the surface light source 102a / 102b, D1> D2 A relationship of 00 mm may be realized << see FIGS. 3 (b) and 3 (c). <<>>
Here, the inclined portion 116 is a so-called chamfered portion, which is a so-called chamfered portion (see FIG. 3C), since the periphery of the intersection (corner) C1 of the virtual extension of the light emitting surface 110 and the virtual extension . <<>>
The contour of the chamfer can be appropriately designed as long as the effects of the illumination device 2 according to the second embodiment can be obtained. For example, it may be a tapered surface (which inclines toward the central portion 112 as it moves upward). Also, it may be a curved surface that connects between the first switching point C2 switching from the light emitting surface 110 to the inclined portion 116 and the second switching point C3 switching from the outer peripheral end surface 158 to the inclined portion 116. The curved surface may be drawn, for example, as a single circular arc, or may be drawn as a so-called “spline curve” which is a combination of a plurality of circular arcs (see reference numeral 116 ′ in FIG. 4).

(3) Effects of Chamfering As described above, the height of the inclined portion 116 provided by so-called “chamfering” is consequently a portion lower than the height of the light emitting surface 110. Therefore, with such a configuration, gap D1 (as a result, air layer AL) is easily provided between inclined portion 116 (part of peripheral portion 114) and first main surface 210 of light transmitting plate 200. be able to.

  In addition, part of the light traveling inside the surface light source 102 can be emitted to the outside at the inclined portion 116. That is, a part of the light traveling inside the surface light source 102 is emitted to the outside through the inclined portion 116 at a direction different from the direction perpendicular to the light emission surface 110. The light transmitting plate 200 which also receives the light emitted in this manner compensates for the lack of luminance in the vicinity of the portion corresponding to the peripheral portion 114 of the second main surface 220 as compared to the case where the inclined portion 116 is not provided. be able to.

In addition, even when the surface light source 102 includes the light diffusion plate 150 having the ridges 155 as in the light diffusion plate 150 described in the first embodiment, the lack of luminance can be similarly compensated for by the inclined portion 116.
When the inclined portion is not provided in the peripheral portion 114 of the light diffusion plate 150, the intersection P1 of the inner side of the ridge portion 155 << the first light incident surface 151 of the light diffusion plate 150 and the inner side surface 157 of the ridge portion Point to the point of intersection. The thickness of the light diffusion plate 150 between the and the outer peripheral edge 159 of the light diffusion plate 150 is thicker than that of the other portions. That is, the distance between the intersection P1 and the outer peripheral edge 159 of the light diffusion plate 150 is longer than, for example, the distance between the intersection P1 and the light exit surface 110. For this reason, light entering from around the intersection P1 and exiting from around the outer peripheral edge 159 travels through the light diffusion plate 150 for a relatively long distance, and the light intensity is attenuated by an extra amount I will. Therefore, the light emitted from the vicinity of the outer peripheral edge 159 after traveling along such a path is emitted as light weaker than the light emitted from the other portions (see FIG. 2B). <<>>
However, if the light diffusion plate 150 ′ is provided with the sloped portion 116 as in the above-described configuration, the distance between the intersection P 1 and the sloped portion 116 may be equal to the distance between the intersection P 1 and the light exit surface 110. It can be approached. For this reason, the light emitted to the outside from the inclined portion 116 becomes light having less attenuation than the light emitted from the outer peripheral edge 159 when the inclined portion 116 is not provided. Therefore, compared with the case where the sloped portion 116 is not provided, it is possible to compensate for the lack of luminance in the vicinity of the portion of the second major surface 220 corresponding to the peripheral edge portion 114.
Therefore, by providing the inclined portion 116 by so-called "chamfering", the luminance of the entire surface on the front side of the lighting device 2 can be made even more uniform.

(4) The surface light source 102 provided with the light diffusing plate 150 having the convex streak portion 155
An example of a specific configuration of the surface light source 102 according to the second embodiment has the following configuration (see FIG. 3C). <<>>

That is, the surface light sources 102a and 102b according to the second embodiment include the light guide plate 130 having the end surface 132 and the first light emission surface 134, and the light emitting source 140 which is disposed to face the end surface 132 and emits light toward the end surface 132. The first light incident surface 151 is disposed on the side of the first light emission surface 134 of the light guide plate 130, and the light emitted from the first light emission surface 134 is incident, and the light incident from the first light incident surface 151 is emitted. And a light diffusion plate 150 having a second light emission surface 152.
Further, the light diffusion plate 150 is provided at a position projecting toward the light guide plate 130 and facing at least the peripheral edge 135 on the end surface 132 side facing the light emission source 140 among the peripheral edge 135 of the first light emission surface 134 of the light guide plate 130 And has a ridge portion 155 having a second light incident surface 156 on which the light emitted from the peripheral portion 135 of the first light emission surface 134 is incident.
The second light emitting surface 152 of the light diffusing plate 150 constitutes the light emitting surface 110 of the surface light source 102, and the outer peripheral end face 158 of the light diffusing plate 150 constitutes the side portion 120 of the surface light source 102.

(5) Size and Angle of “Chamfer” FIG. 5 is a cross-sectional view of an essential part of the light diffusion plate 150 for explaining the size, angle, and the like of the inclined portion 116 of the light diffusion plate 150 of the second embodiment. .

First, in the surface light source 102 provided with the light diffusion plate 150 having the ridges 155 described in (4), the ridges 155 of the light diffusion plate 150 are orthogonal to the light emission surface 110 and the side portions 120 ( It cut | disconnects in the plane orthogonal to the outer peripheral end surface 158) of the light diffusing plate 150, and the cross section of the said convex part 155 shall be seen.
As illustrated in FIG. 3C, when the light diffusion plate 150 is provided with the inclined portion 116 that connects the light emission surface 110 that constitutes the second light emission surface 152 and the outer peripheral end surface 158. The thickness of the ridges 155 in the direction perpendicular to the outer peripheral end surface 158 is defined as W, and the height of the ridges 155 from the second light incident surface 156 to the light emission surface 110 in the direction perpendicular to the light emission surface 110 Is defined as H, and the length between the intersection (angle) C1 of the virtual extension of the light emitting surface 110 and the virtual extension of the outer peripheral end surface 158 and the first switching point C2 switching from the light emitting surface 110 to the inclined portion 116 The length is defined as M, and the length between the intersection (corner) C1 and the second switching point C3 switching from the outer peripheral end surface 158 to the inclined portion 116 is defined as L.

For reference, if the length of the inclined portion 116 (the length of the line connecting the first switching point C2 to the second switching point C3) is too large, the light emitted from the inclined portion 116 becomes too strong. Conversely, if the length of the sloped portion 116 is too small, the effect of providing the sloped portion 116 can not be obtained sufficiently.
Furthermore, even if the length of the inclined portion 116 is constant, generally, if the inclination of the inclined portion 116 (the angle of the line segment C2-C3 with respect to the horizontal surface when the surface light source 102 is placed directly on the horizontal surface) is too large. The angle of the inclined portion 116 approaches the angle of the outer peripheral end surface 158, and the distance from the intersection P1 on the inner side of the ridge portion 155 becomes longer for a portion closer to the light emitting surface 110 in the inclined portion 116 and proceeds from the intersection P1. The light is attenuated by that amount and the effect of providing the sloped portion 116 is reduced. Conversely, if the angle is made too small, the angle of the inclined portion 116 approaches the angle of the light emitting surface 110, and the distance from the intersection P1 inside the ridge portion 155 becomes longer for the portion of the inclined portion 116 closer to the outer peripheral end surface 158. The light traveling from the intersection point P1 is attenuated accordingly, and the effect of providing the sloped portion 116 is reduced.
Therefore, when forming the inclined portion 116, it is necessary to set the first switching point C2 and the second switching point C3 in an optimum range while considering the above circumstances.

In the lighting device 2 according to the second embodiment, when the dimensions W, M, H, and L related to the inclined portion 116 are defined as described above,
(3/10) W M M ((15/10) W and (2/10) H L L ≦ (9/10) H
It is preferable to set the first switching point C2 and the second switching point C3 within the range satisfying the following relationship, and to form the inclined portion 116 so that the contour is cut out within the range of this relational expression (FIG. 5). See the area enclosed by the dashed dotted line).

Also,
(5/10) W M M ((13/10) W and (5/10) H L L ((8/10) H
It is more preferable to set the first switching point C2 and the second switching point C3 within the range satisfying the following relationship and to form the inclined portion 116 so that the contour is cut off within the range of this relationship (see FIG. See the area enclosed by the dashed-two dotted line 5).

Also in the illumination device 2 according to the second embodiment, it is possible to integrate the surface light source 100 and the light transmitting plate 200 as in the illumination device 1 according to the first embodiment, and at that time also with the solvent Welding by welding or ultrasonic welding is preferred.
Furthermore, at the time of welding, when integrating the surface light source 100 and the light transmitting plate 200, the vicinity of the central portion 112 of the light emitting surface 110 of the surface light source 100 and the first main surface 210 of the light transmitting plate 200. It is preferable to weld
When the above configuration is applied, D2 can be forced to approach 0 by welding the central portion 112 of the light emitting surface 110 and the first main surface 210 without a gap, and temporarily the surface light source 100 is a thermal source. Even if deformation occurs due to expansion or the like, it is possible to suppress a change in the distance between the central portion 112 and the first major surface 210, thereby preventing the relationship of D1> D2 ≧ 0 from being broken. .
The lighting device 2 according to the second embodiment is the lighting device according to the first embodiment except for the method of setting the gap between the light emitting surface of the surface light source and the first main surface of the light transmitting plate. It has the same configuration as 1). Therefore, the corresponding effects among the effects of the lighting device 1 according to the first embodiment are similarly provided.

Third Embodiment
FIG. 6 is a figure shown in order to demonstrate the illuminating device 3 based on Embodiment 3. FIG. FIG. 7 is a figure shown in order to demonstrate the illuminating device 4 which is a modification of the illuminating device based on Embodiment 3. FIG.

  The lighting device 3 according to the third embodiment basically has the same configuration as the lighting device 2 according to the second embodiment, but the lighting according to the second embodiment in the method of realizing the relationship of D1> D2 ≧ 0 mm. It is different from the device 2.

  That is, as shown in FIG. 6, when the surface light sources 103 a and 103 b are correctly placed on the horizontal surface, the lighting device 3 according to the third embodiment has the height 112 of the central portion of the light emitting surface 110 as the light emitting surface 110. Is configured to be higher than the height of the peripheral edge portion 114, and a relationship of D1> D2 ≧ 0 mm is realized using a planar light source 103a / 103b having a wedge-shaped cross section.

Since the cross section of the surface light source is a bowl shape, that is, the light emitting surface 110 of the surface light sources 103a and 103b is substantially arc-shaped, the peripheral portion 114 of the light emitting surface 110 is made of the light transmitting plate 200. The gap with the first major surface 210 gradually increases from the central portion 112 toward the side portion 120.
If a relationship of D1> D2 ≧ 0 mm is realized by so-called “chamfering” (see FIG. 3), design of the sloped portion (tilting) in order to equalize the luminance on the second main surface of the lighting device It is necessary to strictly perform the part angle, length, area etc.). However, according to the bowl-shaped surface light source 103, the gap between the peripheral portion 114 of the light emitting surface 110 and the first main surface 210 of the light transmitting plate 200 approaches the side portion 120 as compared to the case of forming by chamfering. As it becomes larger gradually, the light can be blurred gradually over a wide range. For this reason, even in a relatively rough design, it is possible to easily make the luminance uniform.

  A beveled inclined portion 116 may be further provided in the vicinity of the side portion 120 at the peripheral edge portion of the light emitting surface of the bowl-shaped surface light source (see the lighting device 4 in FIG. 7).

  The lighting devices 3 and 4 according to the third embodiment have the same configuration as the lighting device 2 according to the second embodiment except for the method of realizing the relationship of D1> D2 ≧ 0 mm. Therefore, the corresponding effects among the effects of the lighting device 2 according to the second embodiment are similarly provided.

  As mentioned above, although the present invention was explained based on the above-mentioned embodiment, the present invention is not limited to the above-mentioned embodiment. It is possible to implement in the range which does not deviate from the meaning, for example, the following modifications are also possible.

(1) The number, the material, the shape, the position, the size, and the like of the constituent elements described in the above embodiment are exemplifications, and can be changed as long as the effects of the present invention are not impaired.
For example, in each drawing, an example in which two surface light sources are arranged is described. However, the present invention is not limited to this. The illumination device of the present invention can be configured by appropriately changing the number of arrays, such as three, four, six surface light sources.

(2) In the first to third embodiments, as a specific example of the surface light source, the configuration including the light diffusion plate having the ridges has been described. However, the present invention is not limited to this.
FIG. 8 is a figure shown in order to demonstrate the illuminating device 5 which concerns on the modification 1. FIG.
In the present invention, as shown in FIG. 8, using a light emission source 140 ′ capable of emitting light in a plane, a light diffusion plate 150 ′ not having a ridge portion is mounted on the light emission source 140 ′. The illumination device 5 may be configured by forming the surface light source 100 'and superposing the light transmitting plate 200 thereon (Modified Example 1).

(3) In the second embodiment and the third embodiment, in the diagrams (FIG. 3, FIG. 6, etc.) shown to explain the relationship of D1> D2 ≧ 0 mm, the configuration in which D2 = 0 mm is exemplified. However, the present invention is not limited to this. For example, a rib (not shown) may be provided in the vicinity of the central portion 112 of the light emission surface 110 of the surface light source, etc. to form the central portion 112 of the light emission surface 110 of the surface light source and the first light transmitting plate 200. The illumination device may satisfy the relationship of D2> 0 mm while restricting the dimension of the gap D2 between the main surface 210 and the main surface 210.

(4) In the third embodiment, the relationship of D1> D2 ≧ 0 mm can be obtained by using a planar light source whose cross section is a bowl shape, that is, a planar light source whose upper surface is the light emission surface 110 which is the upper surface Was realized. However, the present invention is not limited to this.
FIG. 9 is a figure shown in order to demonstrate the illuminating device 6 which concerns on the modification 2. FIG. FIG. 10 is a figure shown in order to demonstrate the illuminating device 7 which concerns on the modification 3. FIG.
In the present invention, as shown in FIG. 9, a surface light source 105a / 105b may be used, which is warped in the same manner as the upper surface (light emitting surface 110). Further, as shown in FIG. 10, the height of the central portion 112 of the light emitting surface 110 of the surface light source 100a / 100b and the height of the peripheral portion 114 are both the same, and the side of the first main surface 210 'is concave. The light transmitting plate 201 may be used.

(5) In each embodiment, assuming that the total of the areas of the plurality of surface light sources is Ast and the area of the light transmitting plate 200 is B, a lighting device having a substantially equal relationship to Ast and B is illustrated. However, the present invention is not limited to this.
(A) For example, Ast> B, and the sum of the area of the surface light source may be larger than the area of the light transmitting plate 200.
(B) Conversely, Ast <B, and the sum of the area of the surface light source may be smaller than the area of the light transmitting plate 200. For example, in the light transmitting plate 200, it is possible to use the method of irradiating light only to a part of a part of the pattern that needs illumination.
In this case, it is preferable to satisfy 0.5-0.7 <(Ast / B) ≦ 1.0.

(6) In each embodiment, the area of a plurality of surface light sources illustrated the case where it is a surface light source of the mutually same area. However, the present invention is not limited to this.
Other types of surface light sources different in area from other surface light sources may be used to combine the different types of surface light sources to configure the lighting device of the present invention.
At this time, assuming that the area of the surface light source having the smallest area among the plurality of surface light sources is A and the area of the light transmitting plate 200 is B, 0.02 <(A / B) ≦ 0.5 It is preferable to adopt a surface light source having a minimum area so as to satisfy the following relationship.

(7) In each embodiment, a lighting device configured to arrange a plurality of surface light sources so as to be adjacent to each other with the side portions 120 in contact with each other, that is, the side of one surface light source and the side of the other surface light source The lighting device has been described as being not separated from one another. However, the present invention is not limited to this. In practicing the present invention (manufacturing the lighting device according to the present invention), it is understood that a certain degree of manufacturing variation is tolerated practically as long as the effects of the present invention are exhibited.
Therefore, it is understood that lighting devices configured to be separated by a gap within a certain range on the side portions 120 of the plurality of surface light sources are also included in the lighting device of the present invention. That is, as long as there is a slight gap between the side portions 120 of the plurality of surface light sources due to securing of design margins, manufacturing variations, etc., even if they are separated from one another, the effects of the present invention can be exhibited. Such a lighting device is also included in the lighting device of the present invention.
At this time, for example, assuming that the distance between adjacent sides of the surface light source is D3,
It is preferable to satisfy the relationship of 0 ≦ D3 <(D1 / c) (where c is a coefficient satisfying 2 ≦ c ≦ 9).
Further, when the thickness of the light transmitting plate 200 is D4 and the optical turbidity of the light transmitting plate 200 (the number of particles N multiplied by the scattering cross section) is t, {D1 + D4 × (D × 4) It is preferable to evaluate the luminous efficiency of the illumination device and the degree of uniformity of the luminance over the entire second main surface 220 of the light transmitting plate 200 using an index obtained by 1 + t)} / D3.

(8) In each embodiment, the structure which has the light-guide plate 130, the light emission source 140, the diffusion plate 150, the reflecting plate 160, and the flame | frame 170 was shown as a structure of each surface light source 100,102.
However, as another configuration, it is also possible to share the reflector 160 between the plurality of surface light sources 100 and 102. For example, by arranging a plurality of module products including the light guide plate 130, the light emission source 140, the diffusion plate 150, and the frame 170 on a plane on a single reflection plate 160 larger than the diffusion plate, The reflective plate 160 can be shared.
Furthermore, it is possible to share the frame 170 between the adjacent surface light sources 100 and 102. For example, by making the back surfaces of the light emitting sources 140 disposed in the vicinity of the end face 132 of the light guide plate 130 face each other and arranging one frame 170 between the facing light emitting sources 140, the frame 170 can be shared.
By adopting the above configuration, it is possible to reduce the number of parts.

1, 2, 3, 4, 5, 6, 7, 800, 900: illumination device, 100, 100a, 100b, 102, 102a, 103, 103a, 103b, 105a, 105b, 910: surface light source, 110: light emission Surface 112 112 (of light exit surface) central portion 114, 114a edge (of light exit surface) 116 tilt portion 120 side (of surface light source) 130 930a 930b light guide plate 132: end face of light guide plate 134: first light emission surface 135: peripheral portion of light guide plate 136: light guide plate rear surface 140, 140 ′, 840, 940a: light source, 150, 150 ′ Light diffusing plate 151: first light incident surface 152: second light emitting surface 153: central portion of light diffusing plate 154: peripheral portion of light diffusing plate 155: light diffusing plate Convex ridge, 156 ... 2nd light incident surface, 157 ... inside Surface 158: outer peripheral end face of light diffuser plate 159: outer peripheral edge of light diffuser 160: reflector plate 170: frame 171: base of frame 172, 173: frame Light shielding portion 175: outside surface (of frame) 200, 201: light transmitting plate 210, 210 ′: first main surface 220: second main surface 300: symbol layer 870: external case 934a , 934 b ... first light emitting surface, 980 ... support member

Claims (9)

A plurality of the surface light sources arranged so that surface light sources emitting light from at least a central portion and a peripheral portion of the light emission surface are adjacent to each other while being in contact with each other at the side portions of the surface light sources;
A first main surface mounted on the side of the light emission surface of the plurality of surface light sources, on which light emitted from the light emission surface of the surface light source is incident, and a surface on the opposite side to the first main surface A light transmitting plate having a second main surface from which light incident from the first main surface is emitted,
In the peripheral portion of the light emitting surface of the surface light source, a gap between the peripheral portion located on the side adjacent to another surface light source and the first main surface of the light transmitting plate When a gap between the central portion of the light emitting surface of the surface light source and the first main surface of the light transmitting plate is D2,
A lighting device characterized by substantially a relationship of D1 = D2 = 0 mm. In the lighting device according to claim 1,
The surface light source is
A light guide plate having an end face and a first light exit surface;
A light emitting source disposed to face the end face and emitting light toward the end face;
A first light incident surface disposed on the side of the first light emission surface of the light guide plate, on which the light emitted from the first light emission surface is incident, and a second on which the light incident from the first light incident surface is emitted And a light diffusing plate having a light emitting surface,
The light diffusion plate protrudes toward the light guide plate, and is provided at a position facing at least the peripheral edge on the end face side facing the light emission source among the peripheral edges of the first light emission surface of the light guide plate, It has a ridge having a second light incident surface on which light emitted from the peripheral portion of the first light emission surface is incident,
An illumination device, wherein the second light emitting surface of the light diffusing plate constitutes the light emitting surface of the surface light source, and an outer peripheral end surface of the light diffusing plate constitutes an outer peripheral end surface of the surface light source. A plurality of the surface light sources arranged so that surface light sources emitting light from at least a central portion and a peripheral portion of the light emission surface are adjacent to each other while being in contact with each other at the side portions of the surface light sources;
A first main surface mounted on the side of the light emission surface of the plurality of surface light sources, on which light emitted from the light emission surface of the surface light source is incident, and a surface on the opposite side to the first main surface A light transmitting plate having a second main surface from which light incident from the first main surface is emitted,
In the peripheral portion of the light emitting surface of the surface light source, a gap between the peripheral portion located on the side adjacent to another surface light source and the first main surface of the light transmitting plate When a gap between the central portion of the light emitting surface of the surface light source and the first main surface of the light transmitting plate is D2,
A lighting device characterized by substantially a relationship of D1> D2 ≧ 0 mm. In the lighting device according to claim 3,
An illumination apparatus characterized in that an inclined portion connecting the light emitting surface and the side portion is provided at the peripheral portion of the light emitting surface of the surface light source. In the lighting device according to claim 3 or 4,
The surface light source is
A light guide plate having an end face and a first light exit surface;
A light emitting source disposed to face the end face and emitting light toward the end face;
A first light incident surface disposed on the side of the first light emission surface of the light guide plate, on which the light emitted from the first light emission surface is incident, and a second on which the light incident from the first light incident surface is emitted And a light diffusing plate having a light emitting surface,
The light diffusion plate protrudes toward the light guide plate, and is provided at a position facing at least the peripheral edge on the end face side facing the light emission source among the peripheral edges of the first light emission surface of the light guide plate, It has a ridge having a second light incident surface on which light emitted from the peripheral portion of the first light emission surface is incident,
An illumination device, wherein the second light emitting surface of the light diffusing plate constitutes the light emitting surface of the surface light source, and an outer peripheral end surface of the light diffusing plate constitutes an outer peripheral end surface of the surface light source. In the lighting device according to claim 3,
The surface light source is
A light guide plate having an end face and a first light exit surface;
A light emitting source disposed to face the end face and emitting light toward the end face;
A first light incident surface disposed on the side of the first light emission surface of the light guide plate, on which the light emitted from the first light emission surface is incident, and a second on which the light incident from the first light incident surface is emitted And a light diffusing plate having a light emitting surface,
The second light emitting surface of the light diffusing plate constitutes the light emitting surface of the surface light source, and the outer peripheral end surface of the light diffusing plate constitutes at least a part of the outer peripheral end surface of the surface light source,
The light diffusion plate protrudes toward the light guide plate, and is provided at a position facing at least the peripheral edge on the end face side facing the light emission source among the peripheral edges of the first light emission surface of the light guide plate, It has a ridge having a second light incident surface on which light emitted from the peripheral portion of the first light emission surface is incident,
The light diffusion plate is provided with an inclined portion connecting the light emission front surface forming the second light emission surface and the outer peripheral end surface,
When the ridges of the light diffusion plate are cut at a plane orthogonal to the light emitting front and perpendicular to the outer peripheral end face, and a cross section of the ridges is viewed,
The thickness of the ridge in a direction perpendicular to the outer peripheral end surface is defined as W, and the height of the ridge from the second light incident surface to the light emission front in a direction perpendicular to the light emission front Is defined as H, and the length between the intersection of the virtual extension of the light emitting front and the virtual extension of the outer peripheral end and the point at which the light emitting front is switched to the inclined portion is defined as M; And the length between the outer peripheral end face and the point where the inclined portion switches to L is defined as L,
The inclined portion is formed so as to satisfy the relationship of (3/10) W ≦ M ≦ (15/10) W and (2/10) H ≦ L ≦ (9/10) H. Lighting device to be. In the lighting device according to claim 6,
The inclined portion is formed to satisfy the relationship of (5/10) W ≦ M ≦ (13/10) W and (5/10) H ≦ L ≦ (8/10) H. Lighting device to be. In the lighting device according to any one of claims 3 to 7,
An illumination characterized in that the height of the central portion of the light emitting surface is higher than the height of the peripheral portion of the light emitting surface when the surface light source is placed on a horizontal surface. apparatus. In the lighting device according to any one of claims 1 to 8,
The lighting device according to claim 1, wherein the light transmitting plate is welded by a solvent and placed on the surface light source.

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