Back Panel for Lighting Device and Lighting Device

Abstract

To provide a back panel for a lighting device capable of flexibly allowing the thickness change of a light-emitting panel, and to provide a lighting device including the same.SOLUTION: A back panel 110 for a lighting device is equipped with a panel body 112 that is disposed along a back surface 121B on the opposite side to a light-emitting surface 121A of a light-emitting panel 120 when holding the light-emitting panel, and a front panel holding portion 114 that holds a front panel 130 at a position where the front panel 130 sandwiches the light-emitting panel 120 with the panel body 112 when holding the light-emitting panel. The front panel holding portion 114 is configured to set the size of a clearance between the front panel 130 held by the front panel holding portion 114 and the panel body 112 in an optional size.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a back panel for a lighting device and a lighting device including the same.

Background Art

[0002] Conventionally, as described in Patent Document 1, bendable lighting using an OLED (Organic Light Emitting Diode) is known.

[0003] Patent Document 1 describes lighting including an OLED lighting sheet, a transparent film that protects the OLED lighting sheet, and a rectangular casing plate (back panel) that houses and supports these. This back panel includes a back cover portion that makes surface contact with the back surface of the OLED lighting sheet, side protruding end portions that project vertically from both side surfaces of the back cover portion, and guide arm portions that extend inward from the side protruding end portions. The OLED lighting sheet and the transparent film are supported by the back panel by inserting both end portions in the width direction into a gap (groove) between the guide arm portions and the back cover portion.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the back panel of Patent Document 1, grooves are formed at both ends in the width direction over the entire length direction, and both ends of the OLED lighting sheet (light-emitting panel) are inserted into the grooves respectively. Here, the light-emitting panel has a laminated structure including various components (for example, a diffusion plate, a polarizing plate, an LC film or a color filter, etc.) in addition to the light-emitting layer and electrodes, and the thickness varies depending on the specifications. In the back panel of Patent Document 1, since the size of the groove is constant, it is difficult to flexibly respond to the change in the thickness of the light-emitting panel.

[0006] The present invention has been made in view of the above problems, and an object thereof is to provide a back panel for a lighting device that can flexibly respond to a change in the thickness of a light-emitting panel and a lighting device including the same.

Means for Solving the Problems

[0007] The back panel for a lighting device according to one aspect of the present invention is for holding a light-emitting panel for lighting between a front panel. This back panel for a lighting device includes a panel body disposed along the back surface on the opposite side of the light-emitting surface of the light-emitting panel when the light-emitting panel is held by the back panel for the lighting device, and a front panel holding portion that holds the front panel at a position where the front panel sandwiches the light-emitting panel between the front panel holding portion and the panel body when the light-emitting panel is held. The front panel holding portion is configured such that the size of the gap between the front panel held by the front panel holding portion and the panel body can be set to an arbitrary size As described above, when holding the light-emitting panel, there is a spacer that is interposed between the front panel and the panel body to form a gap for accommodating the light-emitting panel between the front panel and the panel body. The spacer is detachably attached to the panel body. .

[0008] In this back panel for a lighting device, since the front panel holding portion is configured such that the size of the gap between the front panel held by the front panel holding portion and the panel body can be set to an arbitrary size, the gap between the front panel and the panel body can be appropriately set to a size corresponding to the thickness of the light-emitting panel when the light-emitting panel is held. Therefore, it is possible to flexibly respond to a change in the thickness of the light-emitting panel.

[0010] Also Since the spacer that forms a gap for accommodating the light-emitting panel between the front panel and the panel body when holding the light-emitting panel is detachably attached to the panel body, when the thickness of the light-emitting panel is changed, among the members of the back panel other than the spacer, only the spacer can be changed to have a thickness corresponding to the thickness of the light-emitting panel while the other members are used as they are, so as to cope with the change in the thickness of the light-emitting panel. Therefore, a back panel that can cope with the change in the thickness of the light-emitting panel at low cost can be obtained.

[0011] The spacer preferably includes a first spacer portion that extends across the entire extending direction of the light-emitting panel on one outer side in the width direction of the light-emitting panel when holding the light-emitting panel, and a second spacer portion that extends across the entire extending direction of the light-emitting panel at a position opposite to the first spacer portion in the width direction of the light-emitting panel when holding the light-emitting panel.

[0012] If the spacer is not partially provided at any location in the extending direction of the light-emitting panel, when the front panel is pressed from the outer side opposite to the light-emitting panel at that location, the front panel may be deformed and damage the light-emitting panel. However, in this configuration, since the first spacer portion and the second spacer portion extend across the entire extending direction of the light-emitting panel on both sides in the width direction of the light-emitting panel, the deformation of the front panel can be more effectively suppressed against the above-mentioned pressing, and the damage to the light-emitting panel can be more effectively prevented.

[0013] The front panel holding portion preferably further has panel fastening screws for fastening the front panel to the panel body in a state where the spacer is interposed between the front panel and the panel body when holding the light-emitting panel.

[0014] According to this configuration, when holding the light-emitting panel, the light-emitting panel is arranged along the panel body in a state where the front panel is separated from the panel body to which the spacer is attached, and the light-emitting panel is sandwiched between the front panel and the panel body, and the front panel is fastened to the panel body with panel fastening screws, whereby the light-emitting panel can be held. Therefore, compared with the conventional back panel for lighting devices in which both end portions in the width direction of the light-emitting panel are slid and inserted along the extending direction of the light-emitting panel into the grooves at both end portions in the width direction thereof to hold the light-emitting panel on the back panel, the work of holding the light-emitting panel on the back panel becomes easier, and damage to the light-emitting panel that may occur when sliding and inserting the end portion of the light-emitting panel into the groove of the back panel can be avoided.

[0015] The lighting device according to another aspect of the present invention includes the back panel for lighting devices in which at least a part of the panel body is curved, the light-emitting panel curved along one main surface of the panel body, and a front panel that sandwiches the light-emitting panel between the front panel and the panel body by being held by the front panel holding portion, and the front panel curved along the light-emitting panel.

[0016] According to this lighting device, by adopting the above-described back panel for lighting devices, the size of the gap between the front panel held by the front panel holding portion and the panel body can be adjusted according to the thickness of the light-emitting panel, and the light-emitting panel can be more reliably brought into contact with the panel body. As a result, it becomes possible to further enhance the heat dissipation effect from the light-emitting panel to the back panel.

[0017] The lighting device according to still another aspect of the present invention is the back panel for the lighting device in which the front panel holding portion has the spacer, the back panel for the lighting device in which at least a part of the panel body is curved, the light emitting panel curved along one main surface of the panel body, and a front panel that sandwiches the light emitting panel between the panel body by being held by the front panel holding portion, the front panel being curved along the light emitting panel. The front panel holding portion further has a spacer fastening screw for fastening the spacer to the panel body, and the front panel has a screw opening opened so that the head of the spacer fastening screw is disposed inside.

[0018] According to this lighting device, by adopting the above-described back panel for the lighting device, the size of the gap between the front panel held by the front panel holding portion and the panel body can be adjusted according to the thickness of the light emitting panel, and the light emitting panel can be more reliably brought into contact with the panel body. As a result, it becomes possible to further enhance the heat dissipation effect from the light emitting panel to the back panel. Further, in this lighting device, since the spacer is fastened to the panel body by the spacer fastening screw, a structure in which the spacer can be detachably disposed between the front panel and the panel body can be realized, and a structure for adjusting the gap between the front panel and the panel body according to a change in the thickness of the light emitting panel can be embodied. Moreover, in this lighting device, interference between the head of the spacer fastening screw and the front panel can be avoided by disposing the head of the spacer fastening screw inside the screw opening of the front panel.

[0019] The light emitting panel preferably has flexibility, the front panel is made of an elastic material, and the light emitting panel and the front panel are preferably coupled to each other and integrally curved along the one main surface.

[0020] According to this configuration, when the front panel is held by the front panel holding portion and the front panel and the light emitting panel are curved along one main surface of the panel body, the flexible light emitting panel can be curved integrally with the front panel made of an elastic material. Although the light emitting panel has flexibility, it generally often includes a thin glass plate. In that case, when the light emitting panel is curved as described above, if a large bending deformation occurs locally and stress is concentrated, the glass plate included in the light emitting panel may crack. On the other hand, in this configuration, by integrally curving the flexible light emitting panel and the front panel made of an elastic material as described above, the occurrence of local bending deformation in the light emitting panel can be avoided by the elasticity of the front panel, and the occurrence of cracking due to stress concentration in the glass plate included in the light emitting panel can be suppressed.

[0023] An illumination device according to still another aspect of the present invention For holding the light-emitting panel for illumination while sandwiching it between the front panel is a back panel for an illumination device, A panel body that is disposed along the back surface on the side opposite to the light-emitting surface of the light-emitting panel when the light-emitting panel is held by the back panel for the lighting device, and a front panel holding portion that holds the front panel at a position where the front panel sandwiches the light-emitting panel between the front panel and the panel body when the light-emitting panel is held. the back panel for the illumination device in which at least a part of the panel body is curved, the light emitting panel curved along one main surface of the panel body, and a front panel that sandwiches the light emitting panel between the front panel and the panel body, the front panel being curved along the light emitting panel. The front panel holding portion is a claw portion that holds the front panel at a position where the front panel sandwiches the light-emitting panel between the front panel and the panel body when the light-emitting panel is held, so that the size of the gap between the front panel held by the front panel holding portion and the panel body can be set to an arbitrary size. The claw portion protrudes outward in the width direction from the end portion in the width direction of the panel body and is configured to be bendable inward in the width direction. A plurality of the claw portions are provided at intervals in the length direction of the panel body, and are bent inward in the width direction with a gap between the claw portions and the panel body, and the end portions of the light emitting panel and the front panel are inserted into the gap.

[0024] According to this illumination device, By bending the claw portion inward in the width direction of the panel body, inserting the front panel and the light-emitting panel into the gap between the claw portion and the panel body, and holding the front panel by the claw portion, the light-emitting panel is held between the front panel and the panel body. The size of the gap between the claw portion and the panel body can be adjusted by the bending angle of the claw portion or the like. Therefore, according to this configuration, by adjusting the bending angle of the claw portion or the like according to the thickness of the light-emitting panel and adjusting the size of the gap between the claw portion and the panel body, it is possible to flexibly respond to changes in the thickness of the light-emitting panel. the light emitting panel can be actually brought into contact with the panel body. As a result, the heat dissipation effect from the light emitting panel to the back panel And sure becomes possible. To high

[0025] The light emitting panel may be curved along the convex surface of the panel body.

[0026] The light-emitting panel may include a light-emitting sheet portion and a cover portion that covers an edge portion of the light-emitting sheet portion and has light-shielding properties and electrical insulation properties.

[0027] According to this configuration, it is possible to suppress light leakage from the edge portion of the light-emitting sheet portion and to more reliably ensure electrical insulation between the wiring of the light-emitting panel and the front panel and the back panel.

Advantages of the Invention

[0028] As is clear from the above description, according to the present invention, it is possible to provide a back panel for a lighting device that can flexibly respond to a change in the thickness of a light-emitting panel and a lighting device including the same.

Brief Description of the Drawings

[0029]

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Embodiments for Carrying Out the Invention

[0030] Hereinafter, based on the drawings, the back panel for the lighting device and the lighting device according to the embodiments of the present invention will be described in detail.

[0031] (First Embodiment) First, the configuration of the back panel 110 for the lighting device according to the first embodiment of the present invention (hereinafter, also simply referred to as "back panel 110") will be described with reference to FIGS. 1 to 7.

[0032] In the lighting device 100 (see FIG. 1) according to the first embodiment, the back panel 110 is for holding a light-emitting panel 120 for lighting between the back panel 110 and a front panel 130. The light-emitting panel 120 is a flat and thin panel having a rectangular outer shape when viewed from a direction along the thickness direction of the light-emitting panel 120 in a state where it is not held by the back panel 110 and the front panel 130. This light-emitting panel 120 has flexibility. The back panel 110 according to the first embodiment holds the light-emitting panel 120 in a curved shape by sandwiching it from both sides in the thickness direction between the front panel 130. As shown in FIGS. 2 and 3, the back panel 110 has a panel body 112 and a front panel holding portion 114.

[0033] The panel body 112 is arranged along the back surface 121B on the side opposite to the light-emitting surface 121A of the light-emitting panel 120 when the light-emitting panel 120 is held by the back panel 110 and the front panel 130. As shown in FIG. 2, the panel body 112 is formed of a plate body curved with a certain curvature. In the first embodiment, in consideration of heat dissipation, the material of the panel body 112 is a material having relatively high thermal conductivity such as aluminum, but the material of the panel body 112 is not limited thereto.

[0034] The panel body 112 has a first main surface 112A facing the back surface 121B of the light-emitting panel 120 when the light-emitting panel is held, and a second main surface 112B facing the side opposite to the first main surface 112A. The first main surface 112A is a concave surface curved with a certain curvature. The second main surface 112B is a convex surface curved with a certain curvature.

[0035] Also, as shown in FIGS. 4 and 5, the panel body 112 has a first outer portion 112a of the panel body located outside one side of the light-emitting panel 120 in the width direction of the light-emitting panel when holding the light-emitting panel, and a second outer portion 112b of the panel body located outside the other side of the light-emitting panel 120 in the width direction of the light-emitting panel when holding the light-emitting panel. The width direction of the light-emitting panel 120 corresponds to a direction orthogonal to both the thickness direction and the extending direction of the light-emitting panel 120. Note that the extending direction of the light-emitting panel 120 corresponds to the length direction of the light-emitting panel 120 when the light-emitting panel 120 is in a flat plate shape, and also corresponds to the direction along the curved shape of the light-emitting panel 120 when the light-emitting panel 120 is held by the back panel 110 and the front panel 130.

[0036] As shown in FIG. 2, a plurality of main body screw holes 113 penetrating both outer portions 112a and 112b in their thickness direction are provided in each of the first outer portion 112a of the panel body and the second outer portion 112b of the panel body. As shown in FIG. 6, the plurality of main body screw holes 113 provided in the first outer portion 112a of the panel body are arranged at intervals along the extending direction of the panel body 112. Similarly, the plurality of main body screw holes 113 provided in the second outer portion 112b of the panel body are arranged at intervals along the extending direction of the panel body 112. The extending direction of the panel body 112 corresponds to the direction along the curved shape of the panel body 112.

[0037] As shown in FIG. 4, the front panel holding portion 114 holds the front panel 130 at a position where the front panel 130 sandwiches the light-emitting panel 120 between the front panel 130 and the panel body 112 when holding the light-emitting panel. The front panel holding portion 114 is configured to be able to change the size of the gap between the held front panel 130 and the panel body 112 according to the thickness of the light-emitting panel 120.

[0038] Specifically, as shown in FIGS. 2 and 3, the front panel holding portion 114 has a spacer 116, a plurality of spacer fastening screws 117, and a plurality of panel fastening screws 118.

[0039] The spacer 116 is interposed between the front panel 130 and the panel body 112 when holding the light-emitting panel to form a gap in which the light-emitting panel 120 is accommodated between the front panel 130 and the panel body 112. The spacer 116 includes a first spacer portion 116A interposed between the front panel 130 and the first outer portion 112a of the panel body when holding the light-emitting panel, and a second spacer portion 116B interposed between the front panel 130 and the second outer portion 112b of the panel body when holding the light-emitting panel.

[0040] The first spacer portion 116A and the second spacer portion 116B are similarly configured. Each of the first spacer portion 116A and the second spacer portion 116B is made of an elongated plate material and has a shape curved along the concave first main surface 112A of the panel body 112. The first spacer portion 116A and the second spacer portion 116B are made of the same material as the panel body 112, but the materials of the first spacer portion 116A and the second spacer portion 116B are not necessarily limited to this.

[0041] The first spacer portion 116A and the second spacer portion 116B are detachably configured between the front panel 130 and the panel body 112. Specifically, the first spacer portion 116A is detachably attached to the first outer portion 112a of the panel body by being fastened thereto, and the second spacer portion 116B is detachably attached to the second outer portion 112b of the panel body by being fastened thereto. The first spacer portion 116A extends over the entire extending direction of the light emitting panel 120 on one outer side in the width direction of the light emitting panel 120 in a state of being attached to the first outer portion 112a of the panel body when holding the light emitting panel. Further, the second spacer portion 116B extends over the entire extending direction of the light emitting panel 120 at a position opposite to the first spacer portion 116A in the width direction of the light emitting panel 120 in a state of being attached to the second outer portion 112b of the panel body when holding the light emitting panel. In such a state, the first spacer portion 116A and the second spacer portion 116B form a space for accommodating the light emitting panel 120 therebetween. The interval between the first spacer portion 116A and the second spacer portion 116B in a state of being attached to the first outer portion 112a of the panel body and the second outer portion 112b of the panel body is set to be slightly larger than the width of the light emitting panel 120.

[0042] Also, both the first spacer portion 116A and the second spacer portion 116B have a thickness that forms a gap capable of accommodating the light emitting panel 120 between the panel body 112 and the front panel 130. Specifically, both the first spacer portion 116A and the second spacer portion 116B have a thickness substantially equal to the thickness of the light emitting panel 120. When holding the light emitting panel, the first spacer portion 116A and the second spacer portion 116B having a thickness corresponding to the thickness of the light emitting panel 120 are selected and attached to the first outer portion 112a of the panel body and the second outer portion 112b of the panel body. Thereby, the size of the gap between the front panel 130 held by the front panel holding portion 114 and the panel body 112 can be adjusted to a size corresponding to the thickness of the light emitting panel 120.

[0043] Each of the first spacer portion 116A and the second spacer portion 116B is provided with a plurality of spacer screw insertion holes 116a penetrating in the thickness direction thereof. The plurality of spacer screw insertion holes 116a are holes through which the spacer fastening screws 117 or the panel fastening screws 118 are inserted respectively. The plurality of spacer screw insertion holes 116a are arranged at intervals along the extending direction of the first spacer portion 116A and the second spacer portion 116B along the curved shape of the first spacer portion 116A and the second spacer portion 116B (see FIG. 7).

[0044] The plurality of spacer fastening screws 117 (see FIG. 2) are screws for fastening the first spacer portion 116A and the second spacer portion 116B to the first outer portion 112a of the panel body and the second outer portion 112b of the panel body respectively. When each of the plurality of spacer fastening screws 117 is inserted into the corresponding spacer screw insertion hole 116a as shown in FIG. 4 and screwed into the corresponding body screw hole 113 of the panel body 112 and tightened, the first spacer portion 116A is fastened to the first outer portion 112a of the panel body and the second spacer portion 116B is fastened to the second outer portion 112b of the panel body.

[0045] The plurality of panel fastening screws 118 (see FIG. 2) are screws for fastening the front panel 130 to the panel body 112 with a spacer 116 interposed between the front panel 130 and the panel body 112 when holding the light-emitting panel. Specifically, each of the plurality of panel fastening screws 118 is inserted through a corresponding front panel screw insertion hole 132 (described later) and a corresponding spacer screw insertion hole 116a as shown in FIG. 5, and is screwed into a corresponding main body screw hole 113 of the panel body 112 and tightened. As a result, a first spacer portion 116A is interposed between the first outer portion 112a of the panel body and the front panel 130, and a second spacer portion 116B is interposed between the second outer portion 112b of the panel body and the front panel 130, and the front panel 130 is fastened to the panel body 112. By fastening the front panel 130 to the panel body 112 with the panel fastening screw 118, the front panel 130 is held at a position where it sandwiches the light-emitting panel 120 between itself and the panel body 112. Further, by the plurality of panel fastening screws 118, not only the front panel 130 but also the first spacer portion 116A and the second spacer portion 116B are fastened to the panel body 112.

[0046] Next, the configuration of the lighting device 100 according to the first embodiment of the present invention will be described.

[0047] The lighting device 100 (see FIG. 1) is a device that irradiates light using an OLED as a light source and is used for visual inspection of the appearance of various cylindrical bodies and medicine ampoules. The lighting device 100 has an overall curved shape. The lighting device 100 includes the back panel 110, the light-emitting panel 120, and the front panel 130.

[0048] As shown in FIG. 2, in the back panel 110 according to the first embodiment, the panel body 112 is curved in an arc shape such that the first main surface 112A of the panel body 112 is a concave surface. The radius of curvature of the panel body 112 is not particularly limited and can be appropriately set according to the use of the lighting device 100 and the like.

[0049] The light-emitting panel 120 is an OLED panel, which is a rectangular thin panel that is slightly smaller than the panel body 112. The light-emitting panel 120 is flexible and is curved in an arc shape along the first main surface 112A of the panel body 112. At one end of the light-emitting panel 120 in the extending direction (length direction), a cable 123 for supplying power to the light-emitting sheet portion 121 described later is connected. The light-emitting panel 120 has a light-emitting panel surface 120A, which is a surface including the light-emitting surface 121A described later, and a light-emitting panel back surface 120B, which is a surface opposite to the light-emitting panel surface 120A.

[0050] The light-emitting panel 120 includes a light-emitting sheet portion 121 and a cover portion 122 that covers the edge of the light-emitting sheet portion 121. The light-emitting sheet portion 121 has a multilayer structure in which a light-emitting layer, electrodes, etc. are laminated on a thin glass plate. The light-emitting sheet portion 121 has a light-emitting surface 121A, which is a surface for emitting light, and a back surface 121B, which is a surface opposite to the light-emitting surface 121A. The light-emitting color of the light-emitting sheet portion 121 is, for example, white, but is not particularly limited. Further, the light-emitting sheet portion 121 may be one on which a diffusion plate, a polarizing plate, an LC film, or a color filter is further laminated.

[0051] The cover portion 122 is made of a film having light-shielding properties and electrical insulation properties, and for example, a black vinyl tape is used. The cover portion 122 is attached along the four sides of the light-emitting sheet portion 121 to cover the edge of the light-emitting surface 121A of the light-emitting sheet portion 121, the edge of the back surface 121B of the light-emitting sheet portion 121, and the side surface (not shown) connecting the light-emitting surface 121A and the back surface 121B of the light-emitting sheet portion 121. When viewed from the light-emitting surface 121A side of the light-emitting sheet portion 121, the cover portion 122 is provided so as to surround the entire periphery of the light-emitting surface 121A. By providing the cover portion 122 in this way, light leakage from the edge of the light-emitting surface 121A, the edge of the back surface 121B, and the side surface of the light-emitting sheet portion 121 can be suppressed, and more reliable electrical insulation between the electrodes of the light-emitting sheet portion 121 and the front panel 130 and the back panel 110 can be ensured. In addition, cracking of the glass plate of the light-emitting sheet portion 121 can also be suppressed.

[0052] The front panel 130 sandwiches the light-emitting panel 120 between the panel body 112 of the back panel 110. The front panel 130 is made of an elastic material that can prevent the generation of non-uniform stress that causes cracks in the glass plate included in the light-emitting sheet portion 121 when the front panel 130 and the light-emitting panel 120 are integrally curved as described later. Specifically, the elastic material of this front panel 130 is a material having an elastic modulus of 100 GPa or more, such as a leaf spring made of SUS. Further, the front panel 130 is surface-treated, for example, by electrocoating or plating.

[0053] The front panel 130 has a rectangular outer shape that is larger than the light-emitting panel 120 (see FIG. 8). The front panel 130 has a rectangular opening 130A that penetrates the front panel 130 in the thickness direction. The light-emitting panel 120 (see FIG. 3) is attached to the front panel 130 such that the light-emitting surface 121A of the light-emitting sheet portion 121 is exposed through the opening 130A of the front panel 130 and the outer peripheral portion of the front panel 130 protrudes outside the light-emitting panel 120. With the light-emitting panel 120 attached to the front panel 130 in this way, the front panel 130 and the light-emitting panel 120 are integrally curved along the panel body 112, and in that state, the front panel 130 is fastened to the panel body 112.

[0054] The front panel 130 has a first outer portion 130a of the front panel located on one outer side of the light-emitting panel 120 and a second outer portion 130b of the front panel located on the other outer side of the light-emitting panel 120 in the width direction of the light-emitting panel 120.

[0055] A plurality of front panel screw insertion holes 132 penetrating both outer portions 130a and 130b of the front panel in the thickness direction are provided in each of the first outer portion 130a and the second outer portion 130b of the front panel. The plurality of front panel screw insertion holes 132 provided in the first outer portion 130a of the front panel are arranged at intervals along the extending direction of the front panel 130. Similarly, the plurality of front panel screw insertion holes 132 provided in the second outer portion 130b of the front panel are arranged at intervals along the extending direction of the front panel 130. The extending direction of the front panel 130 corresponds to the length direction of the rectangular outer shape of the front panel 130 when the front panel 130 is flat, and also corresponds to the direction along the curved shape of the front panel 130 when the front panel 130 is fastened to the panel body 112 and is curved.

[0056] As described above, each of the plurality of panel fastening screws 118 is inserted into the plurality of front panel screw insertion holes 132 provided in the first outer portion 130a and the second outer portion 130b of the front panel and the plurality of spacer screw insertion holes 116a, and is screwed into and tightened in the plurality of main body screw holes 113 of the panel body 112, whereby the front panel 130 is fastened to the panel body 112.

[0057] Further, in order to avoid interference between the heads of the plurality of spacer fastening screws 117 that fasten the first spacer portion 116A and the second spacer portion 116B to the panel body 112 and the front panel 130, a plurality of screw openings 133 are provided at positions corresponding to the heads of the plurality of spacer fastening screws 117. Each of the plurality of screw openings 133 is disposed between adjacent front panel screw insertion holes 132 in the extending direction of the front panel 130. Each screw opening 133 is a notch formed to be recessed inward in the width direction from the edge in the width direction of the front panel 130 and is open outward in the width direction of the front panel 130. The heads of the plurality of spacer fastening screws 117 are disposed in the corresponding screw openings 133, thereby avoiding interference between the heads of the plurality of spacer fastening screws 117 and the front panel 130.

[0058] Next, the manufacturing process of the lighting device 100 will be described.

[0059] First, prepare the curved panel body 112, the curved first spacer portion 116A, and the curved second spacer portion 116B configured as described above. Then, fasten the first spacer portion 116A to the first outer portion 112a of the panel body with a plurality of spacer fastening screws 117, and fasten the second spacer portion 116B to the second outer portion 112b of the panel body with a plurality of spacer fastening screws 117 (see FIG. 3). At this time, arrange the first spacer portion 116A along the concave surface of the first outer portion 112a of the panel body, insert each of the plurality of spacer fastening screws 117 into the corresponding spacer screw insertion hole 116a (see FIG. 4) of the first spacer portion 116A, and thread and tighten them into the corresponding main body screw hole 113 provided in the first outer portion 112a of the panel body to fasten the first spacer portion 116A to the first outer portion 112a of the panel body. Similarly, arrange the second spacer portion 116B along the concave surface of the second outer portion 112b of the panel body, insert each of the plurality of spacer fastening screws 117 into the corresponding spacer screw insertion hole 116a of the second spacer portion 116B, and thread and tighten them into the corresponding main body screw hole 113 provided in the second outer portion 112b of the panel body to fasten the second spacer portion 116B to the second outer portion 112b of the panel body.

[0060] Next, prepare the light-emitting panel 120 and the front panel 130 (see FIG. 2). Then, align the light-emitting panel 120 and the front panel 130 so that the light-emitting surface 121A of the light-emitting sheet portion 121 of the light-emitting panel 120 is exposed through the opening 130A of the front panel 130, and in that state, couple the light-emitting panel 120 and the front panel 130 to each other with an adhesive tape or the like.

[0061] Then, as shown in FIG. 3, the light-emitting panel 120 and the front panel 130 are integrally curved along the first main surface 112A (concave surface) of the panel body 112. After that, the light-emitting panel 120 is disposed between the first spacer portion 116A and the second spacer portion 116B, and in this state, the front panel 130 is fastened to the panel body 112. Specifically, a plurality of panel fastening screws 118 are respectively inserted into the corresponding front panel screw insertion holes 132 and the corresponding spacer screw insertion holes 116a provided in the first spacer portion 116A and the second spacer portion 116B, and screwed into the corresponding main body screw holes 113 and tightened, so that the first spacer portion 116A is interposed between the first outer portion 130a of the front panel and the first outer portion 112a of the panel body, and the second spacer portion 116B is interposed between the second outer portion 130b of the front panel and the second outer portion 112b of the panel body, and the front panel 130 is fastened to the panel body 112. At this time, the heads of the respective spacer fastening screws 117 are disposed within the respective screw openings 133 of the front panel 130.

[0062] Through the above process, the lighting device 100 (see FIG. 1) in which the light-emitting panel 120 is sandwiched between the front panel 130 and the panel body 112 and held in a predetermined curved shape is completed.

[0063] When the thickness of the light-emitting panel 120 is changed, the first spacer portion 116A and the second spacer portion 116B interposed between the front panel 130 and the panel body 112 are changed to have a thickness corresponding to the thickness of the changed light-emitting panel 120. That is, when preparing the first spacer portion 116A and the second spacer portion 116B described above, the first spacer portion 116A and the second spacer portion 116B having a thickness corresponding to the thickness of the changed light-emitting panel 120 are prepared, and the first spacer portion 116A is fastened to the first outer portion 112a of the panel body by a spacer fastening screw 117, and the second spacer portion 116B is fastened to the second outer portion 112b of the panel body by a spacer fastening screw 117. Thereby, thereafter, when the front panel 130 is fastened to the panel body 112 by a panel fastening screw 118 as described above, a gap corresponding to the thickness of the changed light-emitting panel 120 is formed between the front panel 130 and the panel body 112 by the first spacer portion 116A and the second spacer portion 116B, so that the thickness change of the light-emitting panel 120 can be accommodated.

[0064] As described above, in the back panel 110 for a lighting device according to the first embodiment, since the size of the gap between the front panel 130 and the panel body 112 can be set to an arbitrary size, the gap between the front panel 130 and the panel body 112 can be appropriately set to a size corresponding to the thickness of the light-emitting panel 120 when holding the light-emitting panel. Therefore, the thickness change of the light-emitting panel 120 can be flexibly accommodated.

[0065] Specifically, in the first embodiment, a first spacer portion 116A and a second spacer portion 116B that form a gap for accommodating the light-emitting panel 120 between the front panel 130 and the panel body 112 while intervening between the front panel 130 and the panel body 112 when holding the light-emitting panel are detachable between the front panel 130 and the panel body 112. Thus, when the thickness of the light-emitting panel 120 is changed, the first spacer portion 116A and the second spacer portion 116B can be changed to have a thickness corresponding to the thickness of the light-emitting panel 120, and the gap between the front panel 130 and the panel body 112 can be adjusted to a size corresponding to the thickness of the light-emitting panel 120. Moreover, since the first spacer portion 116A and the second spacer portion 116B are detachable between the front panel 130 and the panel body 112 as described above, while the members other than the first spacer portion 116A and the second spacer portion 116B in the back panel 110 can be used as they are, only the first spacer portion 116A and the second spacer portion 116B can be changed to have a thickness corresponding to the thickness of the light-emitting panel 120 to cope with the change in the thickness of the light-emitting panel 120. Therefore, it is possible to cope with the change in the thickness of the light-emitting panel 120 at low cost.

[0066] Also, in the first embodiment, the first spacer portion 116A is interposed between the front panel 130 and the panel body 112 across the entire extending direction of the light-emitting panel 120 on one outer side in the width direction of the light-emitting panel 120 when holding the light-emitting panel, and the second spacer portion 116B is interposed between the front panel 130 and the panel body 112 across the entire extending direction of the light-emitting panel 120 at a position on the opposite side of the first spacer portion 116A in the width direction of the light-emitting panel 120 when holding the light-emitting panel. If the first spacer portion 116A and the second spacer portion 116B are not partially provided at any location in the extending direction of the light-emitting panel 120, when the front panel 130 is pressed from the outer side opposite to the light-emitting panel 120 at that location, the front panel 130 may be deformed to damage the light-emitting panel 120. However, in the first embodiment, since the first spacer portion 116A and the second spacer portion 116B extend across the entire extending direction of the light-emitting panel 120 on both sides in the width direction of the light-emitting panel 120, the deformation of the front panel 130 can be more effectively suppressed against the above-mentioned pressing, and the damage to the light-emitting panel 120 can be more effectively prevented.

[0067] Also, in the first embodiment, with the front panel 130 separated from the panel body 112 to which the first spacer portion 116A and the second spacer portion 116B are attached when holding the light-emitting panel, the light-emitting panel 120 is arranged along the first main surface 112A of the panel body 112, and the light-emitting panel 120 is sandwiched between the front panel 130 and the panel body 112, and the front panel 130 is fastened to the panel body 112 by a plurality of panel fastening screws 118, whereby the light-emitting panel 120 can be held. Therefore, compared with the conventional back panel for a lighting device in which both end portions in the width direction of the light-emitting panel are slid along the extending direction of the light-emitting panel and inserted into grooves at both end portions in the width direction thereof to hold the light-emitting panel on the back panel, the operation of holding the light-emitting panel 120 on the back panel 110 becomes easier, and damage to the light-emitting panel that may occur when the end portion of the light-emitting panel is slid and inserted into the groove of the conventional back panel for a lighting device can be avoided.

[0068] Also, in the lighting device 100 according to the first embodiment, since the back panel 110 is adopted, the size of the gap between the front panel 130 and the panel body 112 can be adjusted by changing the thickness of the spacer 116 according to the thickness of the light-emitting panel 120, and the light-emitting panel 120 can be more reliably brought into contact with the panel body 112. As a result, the heat dissipation effect from the light-emitting panel 120 to the back panel 110 can be further enhanced.

[0069] Also, in the first embodiment, when the front panel 130 is held by the front panel holding portion 114 and the front panel 130 and the light-emitting panel 120 are curved along the first main surface 112A which is the concave surface of the panel body 112, the flexible light-emitting panel 120 can be integrally curved with the front panel 130 made of an elastic material. Although the light-emitting panel 120 has flexibility, since it includes a thin glass plate, when the light-emitting panel 120 is curved as described above and a large local bending deformation occurs and stress is concentrated, there is a risk that the glass plate included in the light-emitting panel 120 will crack. On the other hand, in the first embodiment, by integrally curving the flexible light-emitting panel 120 and the front panel 130 made of an elastic material as described above, the occurrence of local bending deformation in the light-emitting panel 120 can be avoided by the elasticity of the front panel 130, and the occurrence of cracks due to stress concentration in the glass plate included in the light-emitting panel 120 can be suppressed.

[0070] In the first embodiment, the front panel holding portion 114 has a plurality of spacer fastening screws 117 for fastening the first spacer portion 116A and the second spacer portion 116B to the panel body 112. The front panel 130 has a plurality of screw openings 133 opened so that the heads of the plurality of spacer fastening screws 117 are arranged inside. Therefore, in the first embodiment, while realizing a configuration in which the first spacer portion 116A and the second spacer portion 116B are detachably attached to the panel body 112 by the plurality of spacer fastening screws 117, the heads of those spacer fastening screws 117 are arranged in the corresponding screw openings 133 of the front panel 130, thereby avoiding interference between the heads of those spacer fastening screws 117 and the front panel 130.

[0071] (Second Embodiment) First, the configuration of the back panel 10 for a lighting device according to the second embodiment of the present invention (hereinafter, also simply referred to as "back panel 10") will be described with reference to FIGS. 9 to 11. FIG. 9 is a perspective view schematically showing a lighting device 1 incorporating the back panel 10 according to the second embodiment. FIG. 10 is an exploded perspective view of the lighting device 1 according to the second embodiment.

[0072] As shown in FIG. 10, the back panel 10 is for holding a light-emitting panel 20 for illumination between it and a front panel 30, and is incorporated in the lighting device 1 in a state of being curved in an arc shape. The back panel 10 is made of, for example, an aluminum plate, and can maintain a constant curvature in a curved state as shown in FIG. 10. In this second embodiment, an aluminum back panel 10 is adopted in consideration of heat dissipation, but the material of the back panel is not limited to this.

[0073] FIG. 11 is a plan view schematically showing the configuration of the back panel 10 in a flat plate state before bending. As shown in FIG. 11, the back panel 10 includes a panel body 11 made of a rectangular plate in a plan view, and a plurality of claw portions 12 protruding outward in the width direction from an end portion 13 in the width direction of the panel body 11.

[0074] The panel body 11 has a first main surface 11A on which the light emitting panel 20 (FIG. 10) is disposed, and a second main surface 11B (FIG. 12) facing the opposite side of the first main surface 11A.

[0075] At the end 13 in the width direction of the panel body 11, a notch 13A that is recessed inward in the width direction is formed. As shown in FIG. 11, the notch 13A is a groove that is open outward in the width direction, and is defined by a pair of groove wall surfaces 13C and a groove bottom surface 13B (bottom). The groove wall surfaces 13C each extend in the width direction and face each other with a space therebetween in the length direction. The groove bottom surface 13B extends in the length direction and connects the inner ends of the groove wall surfaces 13C.

[0076] In this second embodiment, a plurality of notches 13A are formed at equal intervals in the length direction at each of the end portions 13 on one side and the other side in the width direction. Each notch 13A is formed with the same shape and size, but is not limited thereto.

[0077] The plurality of claw portions 12 are included in the concept of the front panel holding portion in the present invention, and hold the front panel 30 at a position where the front panel 30 sandwiches the light emitting panel 20 between the panel body 11. Each claw portion 12 protrudes outward in the width direction from the groove bottom surface 13B of the notch 13A. More specifically, as shown in FIG. 11, each claw portion 12 has a base end 12A connected to the groove bottom surface 13B and a tip end 12B located outside the end 13 of the panel body 11 in the width direction, and extends from the base end 12A toward the tip end 12B. Further, there is a slight gap between both side surfaces of the claw portion 12 and the groove wall surface 13C, and the side surface of the claw portion 12 and the groove wall surface 13C are not in contact with each other.

[0078] One claw portion 12 is provided for each notch 13A. Therefore, in this second embodiment, a plurality of claw portions 12 are provided at equal intervals in the length direction at each of the end portions 13 on one side and the other side in the width direction. Note that the notch 13A and the claw portion 12 are formed by laser processing a flat plate that is rectangular in plan view, and the shape is not particularly limited.

[0079] The claw portion 12 is a portion for holding the light-emitting panel 20 and the front panel 30 with respect to the panel main body 11 (FIG. 9), and is configured to be bendable inward in the width direction of the panel main body 11. FIG. 12 is a side view of the back panel 10 as viewed from the direction of arrow XII in FIG. 11. As shown by the broken line in FIG. 12, the claw portion 12 can be bent inward in the width direction of the panel main body 11 about the connection portion (base end 12A, FIG. 11) with the panel main body 11. At this time, the height H1 of the gap between the claw portion 12 and the first main surface 11A can be adjusted according to the bending angle of the claw portion 12. In FIG. 12, the claw portion 12 is bent so as to face the first main surface 11A, but the claw portion 12 can also be bent so as to face the second main surface 11B.

[0080] Next, the configuration of the lighting device 1 according to the second embodiment of the present invention will be described with reference to FIGS. 9 and 10. The lighting device 1 uses an OLED as a light source and has a curved shape, and is used for the appearance inspection of various cylindrical bodies and medicine ampoules. The lighting device 1 includes a back panel 10, a light-emitting panel 20, and a front panel 30.

[0081] As shown in FIG. 10, in the back panel 10 in the second embodiment, the claw portion 12 is bent inward in the width direction with a gap between the claw portion 12 and the first main surface 11A of the panel main body 11, and the panel main body 11 is curved in an arc shape so that the first main surface 11A becomes a concave surface. Both end portions in the width direction of the light-emitting panel 20 and the front panel 30 are inserted into the gap. The radius of curvature of the panel main body 11 is not particularly limited and can be appropriately set according to the use of the lighting device 1 and the like.

[0082] The light-emitting panel 20 is an OLED panel, and is a rectangular thin panel that is slightly smaller than the back panel 10. The light-emitting panel 20 is bendable and is curved in an arc shape along the first main surface 11A of the panel main body 11 as shown in FIG. 10.

[0083] More specifically, the light-emitting panel 20 includes a light-emitting sheet portion 21 and a cover portion 22 that covers the edge portion of the light-emitting sheet portion 21. The light-emitting sheet portion 21 has a multilayer structure in which a light-emitting layer, electrodes, etc. are laminated on a thin glass plate, and has a light-emitting surface 21A. The light-emitting color is, for example, white, but is not particularly limited. Further, the light-emitting sheet portion 21 may be one on which, for example, a diffusion plate, a polarizing plate, an LC film, or a color filter is further laminated.

[0084] The cover portion 22 is a film having light-shielding properties and electrical insulation properties, and for example, a black vinyl tape or the like can be used. FIG. 13 shows a cross section along the width direction of the light-emitting panel 20. As shown in FIG. 13, the cover portion 22 covers the edge portion of the surface (the surface including the light-emitting surface 21A) of the light-emitting sheet portion 21, the edge portion of the back surface 21B of the light-emitting sheet portion 21, and the side surface 21C (the surface connecting the front surface and the back surface 21B) of the light-emitting sheet portion 21, and is attached over the entire edge portion of the light-emitting sheet portion 21 (along the four sides of the light-emitting sheet portion 21). When viewed from the surface side of the light-emitting sheet portion 21, the cover portion 22 is provided so as to surround the entire periphery of the light-emitting surface 21A. By providing this cover portion 22, it is possible to suppress light leakage from the edge portions and the side surfaces of the front and back surfaces of the light-emitting sheet portion 21, and to more reliably ensure electrical insulation between the electrodes of the light-emitting sheet portion 21 and the front panel 30 and the back panel 10. Further, breakage of the glass plate of the light-emitting sheet portion 21 can also be suppressed.

[0085] The front panel 30 sandwiches the light-emitting panel 20 between it and the back panel 10, and is made of an elastic material such as a leaf spring made of SUS, for example. The front panel 30 is curved along the light-emitting panel 20, and in this curved state, it is held together with the light-emitting panel 20 by the claw portions 12 to the back panel 10. The front panel 30 has a rectangular shape that is smaller than the back panel 10 and larger than the light-emitting panel 20, and an opening 30A for exposing the light-emitting surface 21A is formed. Further, the front panel 30 is surface-treated by, for example, electrodeposition coating or plating.

[0086] The light-emitting panel 20 is pressed against the first main surface 11A (concave surface) of the back panel 10 by the reaction force accompanying the bending of the front panel 30. Specifically, since the front panel 30 is made of an elastic material, a reaction force F1 (Fig. 9) that tries to return from the curved state to the flat state is generated. Due to this reaction force F1, the light-emitting panel 20 is pushed toward the back panel 10 side. In the second embodiment, since the front panel 30 is curved such that the substantially central portion in the length direction becomes the top, the reaction force F1 acts strongly as it moves away from the central portion in the length direction.

[0087] Next, the manufacturing process of the lighting device 1 will be described.

[0088] First, the back panel 10 is manufactured in the following procedure. First, a rectangular aluminum flat plate (not shown) in plan view is prepared, and the outer shape of this flat plate is processed by a laser as shown in Fig. 11. Next, the claw portion 12 is struck with a hammer (not shown) or the like, and the claw portion 12 is erected at a predetermined angle θ with respect to the panel body 11 as shown by the broken line in Fig. 14.

[0089] Next, the back panel 10 is set in a jig (not shown), and a height adjustment plate 40 is arranged on the first main surface 11A of the panel body 11 as shown in Fig. 15. As this height adjustment plate, one having a thickness corresponding to the total thickness of the light-emitting panel 20 and the front panel 30 is used. In this state, as shown by the broken line in Fig. 15, the claw portion 12 is bent radially inward along the upper surface of the height adjustment plate 40. Then, the height adjustment plate 40 is removed. In this way, the claw processing of the back panel 10 is completed.

[0090] Next, the bending process of the back panel 10 is performed. As shown in Fig. 16, the back panel 10 after the claw processing is placed on the die 50. Then, the back panel 10 is conveyed in the length direction at a predetermined pitch and passed between the die 50 and the curved punch 60. As a result, the back panel 10 is curved with a predetermined radius of curvature, and the processing of the back panel 10 is completed.

[0091] Next, a light-emitting panel 20 and a front panel 30 are prepared respectively. Then, these are arranged along the concave surface (the first main surface 11A) of the back panel 10, and both end portions in the width direction thereof are held by the claw portions 12. Specifically, the light-emitting panel 20 and the front panel 30 are overlapped and inserted into the gap between the claw portion 12 and the panel main body 11 from one end in the length direction. Thereby, the lighting device 1 (FIG. 9) in which the light-emitting panel 20 is sandwiched between the front panel 30 and the back panel 10 is completed.

[0092] As described above, according to the back panel 10 for a lighting device according to the second embodiment, since the bending angle of the claw portion 12 and the like can be adjusted according to the thickness of the light-emitting panel 20, and the size of the gap between the claw portion 12 and the panel main body 11 can be adjusted, it is possible to flexibly cope with a change in the thickness of the light-emitting panel 20. Thereby, it becomes possible to more surely bring the light-emitting panel 20 into contact with the concave surface of the back panel 10, and the heat radiation effect from the light-emitting panel 20 to the back panel 10 can be further enhanced.

[0093] (Third Embodiment) Next, the configuration of the lighting device 2 according to the third embodiment of the present invention will be described with reference to FIG. 17. The third embodiment is basically the same as the second embodiment, but differs in that the light-emitting panel 20 and the front panel 30 are arranged on the convex surface side of the back panel 10. Hereinafter, only the differences from the second embodiment in the configuration of the back panel 10 and the lighting device 2 according to the third embodiment will be described.

[0094] As shown in FIG. 17, in the third embodiment, the claw portion 12 is bent inward in the width direction so as to face the convex surface (the second main surface 11B) of the panel main body 11. The light-emitting panel 20 and the front panel 30 are curved along the second main surface 11B of the panel main body 11, and are held by the back panel 10 by the claw portion 12 in the same manner as in the second embodiment.

[0095] Thus, the claw portion 12 of the back panel 10 can be bent not only toward the first main surface 11A side but also toward the second main surface 11B side. Therefore, it is possible to manufacture not only the lighting device 1 in which the light emitting panel 20 is disposed on the concave surface of the back panel 10 but also the lighting device 2 in which the light emitting panel 20 is disposed on the convex surface of the back panel 10 using the same back panel 10.

[0096] (Fourth Embodiment) Next, the configuration of the back panel 3 for a lighting device according to the fourth embodiment of the present invention will be described with reference to FIG. 18. The back panel 3 according to the fourth embodiment is basically the same as the back panel 10 according to the second embodiment, but is different from the back panel 10 according to the second embodiment in the pitch of the claw portions 12. Hereinafter, only the points different from the back panel 3 according to the second embodiment will be described in the configuration of the back panel 3 according to the fourth embodiment.

[0097] FIG. 18 schematically shows the arrangement of the claw portions 12 in the back panel 3 according to the fourth embodiment. As shown in FIG. 18, the back panel 3 according to the fourth embodiment is entirely a curved portion. The back panel 3 according to the fourth embodiment includes a central portion 61 in the longitudinal direction, a first end portion 62 and a second end portion 63 in the longitudinal direction, a first intermediate portion 64 located between the central portion 61 and the first end portion 62, and a second intermediate portion 65 located between the central portion 61 and the second end portion 63. The pitch of the claw portions 12 is narrower in the first intermediate portion 64 and the second intermediate portion 65 of the curved portion of the panel body 11 than in the central portion 61 and both end portions in the longitudinal direction of the curved portion. That is, in the first intermediate portion 64 and the second intermediate portion 65, the interval between adjacent claw portions 12 in the longitudinal direction is narrower than in the central portion 61, the first end portion 62, and the second end portion 63. In other words, in the first intermediate portion 64 and the second intermediate portion 65, the claw portions 12 are formed more densely than in the central portion 61, the first end portion 62, and the second end portion 63.

[0098] According to the study by the present inventor, when the light-emitting panel 20 is arranged along the curved back panel 10, it has been found that the light-emitting panel 20 is likely to be separated from the main surface of the back panel 10 at the first intermediate portion 64 and the second intermediate portion 65. On the other hand, by providing the claw portions 12 more densely at the first intermediate portion 64 and the second intermediate portion 65, the light-emitting panel 20 can be held more firmly against the back panel 10, and it is possible to suppress the widening of the gap between the light-emitting panel 20 and the back panel 10. As a result, the heat dissipation effect from the light-emitting panel 20 to the back panel 10 can be further enhanced.

[0099] Note that when the claw portion 12 is bent to the concave surface side of the back panel 10, it is not limited to the case where the density of the claw portion 12 is provided. When the claw portion 12 is bent to the convex surface side of the back panel 10, the density of the claw portion 12 may be provided as in the fourth embodiment.

[0100] (Other Embodiments) Here, other embodiments of the present invention will be described.

[0101] In the first to fourth embodiments, the case where the entire back panels 110, 10, 3 are curved in an arc shape has been described, but it is not limited thereto. For example, the back panel may be curved in an S shape, or may include a curved portion and a flat plate portion. Further, even when the back panel includes a curved portion, it is not limited thereto, and the entire back panel may be flat.

[0102] Also, in the first embodiment, the first spacer portion 116A and the second spacer portion 116B of the back panel 110 extend over the entire extending direction of the light-emitting panel 120, but it is not limited thereto.

[0103] For example, the spacer may be divided into a plurality in its extending direction, and the plurality of divided spacers may be provided at intervals along the extending direction of the light-emitting panel. In this case, it is preferable that each of the divided spacers is provided at a position corresponding to each panel fastening screw for fastening the front panel to the panel body.

[0104] Further, the spacer may be a cylindrical one provided for each panel fastening screw between the front panel and the panel body and through which each panel fastening screw is inserted.

[0105] Further, the spacer may be arranged so as to surround the entire circumference of the light-emitting panel between the front panel and the panel body. Further, the spacer may be arranged so as to surround three sides of the light-emitting panel excluding the cable side between the front panel and the panel body.

[0106] Also, in the first embodiment, the first spacer portion 116A and the second spacer portion 116B are fastened to the panel body 112 by the spacer fastening screws 117, but the configuration of the present invention is not necessarily limited to one in which the spacer is fastened to the panel body by the spacer fastening screws. For example, the spacer may be fastened only by being fastened to the panel body together with the front panel by the panel fastening screws, and the fastening of the spacer alone to the panel body by the spacer fastening screws may be omitted. Further, the spacer may be simply sandwiched between the front panel and the panel body and fixed between the front panel and the panel body, and the fastening of the spacer by screws may be omitted.

[0107] Also, in the back panel and the lighting device in which a gap is formed between the front panel and the panel body by the spacer, the light-emitting panel and the front panel may be arranged on the convex surface side of the panel body and curved along the convex surface in the same manner as in the third embodiment. In this case, the spacer may have a shape curved along the convex surface of the panel body and may be installed on the convex surface of the panel body. For example, the first spacer portion 116A and the second spacer portion 116B in the first embodiment may be curved in the opposite direction to form a shape along the convex surface of the panel body.

[0108] The embodiments disclosed herein should be construed as illustrative in all respects and not restrictive. The scope of the present invention is shown not by the above description but by the claims, and it is intended that all modifications within the meaning and scope equivalent to the claims be included.

Explanation of Reference Numerals

[0109] 100, 1, 2 Lighting device 110, 3, 10 Back panel 112, 11 Panel body 112A, 11A First main surface 112B, 11B Second main surface 12 Claw portion (front panel holding portion) 114 Front panel holding portion 116 Spacer 116A First spacer portion 116B Second spacer portion 117 Spacer fastening screw 118 Panel fastening screw 120, 20 Light-emitting panel 121, 21 Light-emitting sheet portion 122, 22 Cover portion 130, 30 Front panel 133 Opening for screw

Claims

1. A back panel for a lighting device for holding a light-emitting panel for illumination while sandwiching it between a front panel, comprising: a panel body arranged along the back surface on the side opposite to the light-emitting surface of the light-emitting panel when the light-emitting panel is held by the back panel for the lighting device; a front panel holding portion for holding the front panel at a position where the front panel sandwiches the light-emitting panel between the front panel and the panel body when the light-emitting panel is held; and the front panel holding portion is configured to be able to set the size of the gap between the front panel held by the front panel holding portion and the panel body to an arbitrary size, and has a spacer that forms a gap for accommodating the light-emitting panel between the front panel and the panel body while intervening between the front panel and the panel body when the light-emitting panel is held; the spacer is detachably attached to the panel body, a back panel for a lighting device.

2. The back panel for a lighting device according to claim 1, wherein the spacer includes a first spacer portion extending over the entire length in the extending direction of the light-emitting panel on one outer side in the width direction of the light-emitting panel when the light-emitting panel is held, and a second spacer portion extending over the entire length in the extending direction of the light-emitting panel at a position opposite to the first spacer portion in the width direction of the light-emitting panel when the light-emitting panel is held.

3. The back panel for a lighting device according to claim 1 or 2, wherein the front panel holding portion further has a panel fastening screw for fastening the front panel to the panel body with the spacer interposed between the front panel and the panel body when the light-emitting panel is held.

4. A lighting device comprising: the back panel for a lighting device according to any one of claims 1 to 3, wherein at least a part of the panel body is curved; a light-emitting panel curved along one main surface of the panel body; and a front panel that sandwiches the light-emitting panel between the front panel and the panel body by being held by the front panel holding portion, the front panel being curved along the light-emitting panel.

5. A lighting device comprising: the back panel for a lighting device according to any one of claims 1 to 3, wherein at least a part of the panel body is curved; The light-emitting panel curved along one main surface of the panel body, A front panel that holds the light-emitting panel between the panel body by being held by the front panel holding part, the front panel being curved along the light-emitting panel, and comprising: The front panel holding part includes a spacer that forms a gap for accommodating the light-emitting panel between the front panel and the panel body by intervening between the front panel and the panel body, and a spacer fastening screw for fastening the spacer to the panel body. The front panel has a screw opening that opens so that the head of the spacer fastening screw is disposed inside, the lighting device.

6. The light-emitting panel has flexibility, The front panel is made of an elastic material, The lighting device according to claim 4 or 5, wherein the light-emitting panel and the front panel are coupled to each other and integrally curved along the one main surface.

7. A back panel for a lighting device for holding a light-emitting panel for illumination between the front panel, comprising: a panel body disposed along the back surface on the opposite side of the light-emitting surface of the light-emitting panel when the light-emitting panel is held by the back panel for the lighting device; and a front panel holding part for holding the front panel at a position where the front panel sandwiches the light-emitting panel between the front panel and the panel body when the light-emitting panel is held, the back panel for the lighting device having at least a part of the panel body curved. The light-emitting panel curved along one main surface of the panel body, A front panel that sandwiches the light-emitting panel between the panel body, the front panel being curved along the light-emitting panel, and comprising: The front panel holding part is a claw part that holds the front panel at a position where the front panel sandwiches the light-emitting panel between the front panel and the panel body when the light-emitting panel is held, so that the size of the gap between the front panel held by the front panel holding part and the panel body can be set to an arbitrary size, the claw part protruding outward in the width direction from an end in the width direction of the panel body and being configured to be bendable inward in the width direction. A plurality of the claw portions are provided at intervals in the length direction of the panel body, and are bent inward in the width direction with a gap therebetween from the panel body. An illumination device, wherein end portions of the light-emitting panel and the front panel are inserted into the gap.

8. The illumination device according to any one of claims 4 to 7, wherein the light-emitting panel is curved along the convex surface of the panel body.

9. The illumination device according to any one of claims 4 to 8, wherein the light-emitting panel includes a light-emitting sheet portion and a cover portion having light-shielding properties and electrical insulation properties that cover an edge portion of the light-emitting sheet portion.

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