WO2014175020A1 - Internal lighting-type lighting device - Google Patents

Abstract

The present invention is provided with multiple planar light-emitting panels (100), a chassis (50), and a curved lighting panel (60). The chassis (50 supports the multiple planar light-emitting panels (100). The curved lighting panel (60) is supported by the chassis (50). In the curved lighting panel (60), light radiated from the multiple planar light-emitting panels (100) is radiated from the inner surface toward the outer surface. Using a point at which a light-emitting centroidal line (L21) intersects the lighting panel (60) as a reference point (P1), the multiple planar light-emitting panels (100) are supported by the chassis (50) so that the distances (D1) from the respective surfaces (100S) of the multiple planar light-emitting panels (100) to the reference point (P1) in the light-emitting centroidal line (L21) are the same. The light-emitting centroidal line extends from the centroid positions on the respective surfaces of the multiple planar light-emitting panels (100) perpendicularly to the surface (100S) of the planar light-emitting panel (100).

Description

Internal illumination system

The present invention relates to the structure of an internally illuminated lighting device using a surface light emitting element.

Japanese Patent Laying-Open No. 2012-141342 (Patent Document 1) relates to a display panel and discloses a structure in which a curved light guide plate is used to illuminate a curved panel from the inside using an LED as a light emission source. Yes.

Japanese Patent Application Laid-Open No. 11-1226029 (Patent Document 2) relates to a display capable of displaying a curved surface, and discloses a structure in which a flexible light emitting sheet is bent and attached to a backlight unit along a liquid crystal cell.

JP 2012-141342 A JP 11-1226029 A

In recent years, development of a lighting device in which a plurality of planar light-emitting panels such as organic EL (Organic Electroluminecense) panels are arranged in a planar shape is in progress. In the future, the development of a lighting device using an organic EL panel capable of freely forming a curved surface shape is also expected, but at present, development of a planar light emitting panel in a flat state is in progress. .

On the other hand, as a lighting device installed in a tunnel and a commercial advertisement lighting device installed on a pillar in a station, an internally illuminated lighting device in which a light source is housed is often used. Also in this internally illuminating device, the use of a planar light emitting panel using an organic EL panel or the like as a light source is expected.

However, the walls in the tunnel and the pillars in the station have many curved surfaces. When a planar light emitting panel using an organic EL panel that is not curved as a light source is used and a plurality of planar light emitting panels are arranged, when viewed from the surface of the lighting panel through which light emitted from the planar light emitting panel passes Therefore, it is necessary to obtain an illumination state (light emission state) where brightness unevenness is not noticeable.

Therefore, the present invention has been made in view of the above problems, and in an internally-illuminated illumination device having a curved illumination panel, when a plurality of surface-emitting light sources are employed, the illumination panel has an inconspicuous luminance state. It is an object of the present invention to provide an internally illuminated lighting device having a structure capable of obtaining the above.

In the internally illuminating device according to the present invention, a plurality of planar light emitting panels, a casing that supports the plurality of planar light emitting panels, and a casing that is supported by the casing and irradiated from the plurality of planar light emitting panels. And a curved illumination panel that is irradiated from the inner surface toward the outer surface.

A plurality of light emission centroid lines on the light emission centroid lines with reference to a point where a light emission centroid line extending perpendicularly to the surface of the planar light emission panel from the position of the center of gravity of each surface of the plurality of planar light emission panels intersects the illumination panel. The plurality of planar light emitting panels are supported by the casing so that the distances from the respective surfaces of the planar light emitting panels to the reference point are equal.

According to this invention, in the internal illumination type illumination device having a curved illumination panel, when a plurality of surface-emitting light sources are employed, the illumination panel has a structure capable of obtaining an illumination state in which luminance unevenness is not conspicuous, It is possible to provide an internally illuminated lighting device.

It is a front view which shows the internal illumination type illuminating device in embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. It is a top view which shows the planar light emitting element used for the internal illumination type illuminating device in embodiment. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is a cross-sectional schematic diagram which shows the arrangement | positioning relationship between the illumination panel and planar light emission panel of the internal illumination type illuminating device in embodiment. It is a cross-sectional schematic diagram which shows the arrangement | positioning relationship between the illumination panel of the internal illumination type illuminating device in embodiment, and a some planar light emission panel. It is a 1st cross-sectional schematic diagram which shows the attachment structure to the housing of the planar light emission unit employ | adopted for the internal illumination type illuminating device in embodiment. It is a 2nd cross-sectional schematic diagram which shows the attachment structure to the housing of the planar light emission unit employ | adopted for the internal illumination type illuminating device in embodiment. It is a cross-sectional schematic diagram which shows the arrangement | positioning relationship between the illumination panel of the internal illumination type illuminating device in Embodiment 2, and a some planar light emission panel. It is a cross-sectional schematic diagram which shows the arrangement | positioning relationship between the illumination panel and the some planar light emission panel of the internal illumination type illuminating device in other embodiment. Furthermore, it is a cross-sectional schematic diagram which shows the arrangement | positioning relationship between the illumination panel and the some planar light emission panel of the internally-illuminated illuminating device in other embodiment. It is a figure which shows the state which drew the design on the illumination panel.

DETAILED DESCRIPTION Hereinafter, an internally illuminating illumination device in each embodiment based on the present invention will be described with reference to the drawings. In the embodiments described below, when referring to the number, amount, and the like, the scope of the present invention is not necessarily limited to the number, amount, and the like unless otherwise specified. The same parts and corresponding parts are denoted by the same reference numerals, and redundant description may not be repeated. It is planned from the beginning to use a combination of the configurations in each embodiment as appropriate.

(Embodiment 1: Internal illumination device 500)
With reference to FIG. 1 and FIG. 2, the internal illumination type illumination device 500 in the present embodiment will be described. FIG. 1 is a front view showing an internally-illuminated lighting device 500 in the present embodiment, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

The internally illuminated lighting device 500 according to the present embodiment is attached along a wall 1000 having a curved wall surface. Examples of the curved wall 1000 include a wall in a tunnel, a pillar in a station, a ceiling wall of a bus, a train, and the like.

Referring to FIGS. 1 and 2, internally illuminating device 500 has a plurality of planar light emitting panels 100 therein, and each planar light emitting panel 100 is supported by housing 50. The housing 50 has a shape along the wall surface of the wall 1000. On the opposite side of the housing 50 from the wall 1000, an illumination panel 60 having a curved shape along the wall surface is provided. The lighting panel 60 is made of a light-transmitting material, and generally an acrylic resin or the like is used. For the lighting panel 60, a member having a light scattering effect may be used in order to suppress the occurrence of luminance unevenness.

The light emitted from each planar light emitting panel 100 passes through the illumination panel 60, and the entire surface of the illumination panel 60 can obtain a light emission state as a display surface. The illumination panel 60 can be used as an illumination device by using, for example, a milky white translucent panel.

As shown in FIG. 12, by drawing a design on the lighting panel 60, it can also be used as an advertising device. Since the internally illuminated illumination device 500 is irradiated with light from the inside, the design can be clearly recognized even in a dark place.

As shown in FIG. 1, the internally-illuminated lighting device 500 of the present embodiment includes four square light emitting panels 100 arranged vertically and 8 horizontally, for a total of 32 sheets. The shape of the planar light emitting panel 100 is not limited to a square, and various shapes such as a rectangle and a hexagon can be used. The number of the planar light emitting panels 100 to be used is also appropriately selected according to the size of the lighting panel 60.

(Surface emitting panel 100)
The planar light emitting panel 100 in the present embodiment is composed of a planar light emitting element 10 using organic EL (see FIG. 4). The planar light emitting panel 100 includes a case where the planar light emitting panel 100 is composed of one planar light emitting element 10 and a case where it is composed of two or more planar light emitting elements 10. The planar light emitting panel 100 may be configured as a planar light emitting panel using a plurality of light emitting diodes (LEDs) and a diffusion plate, or may be configured as a planar light emitting panel using a cold cathode tube or the like. .

FIG. 3 is a plan view showing the planar light emitting device 10. FIG. 3 shows a state where the planar light emitting device 10 is viewed from the back surface 19 side of the planar light emitting device 10. 4 is a cross-sectional view taken along line IV-IV in FIG.

3 and 4, the planar light emitting device 10 has a square shape with a side of about 10 cm in length, and includes a transparent substrate 11 (cover layer), an anode 14, an organic layer 15, a cathode 16, a seal. A stop member 17 and an insulating layer 18 are included. The transparent substrate 11 forms the surface 12 (light emitting surface) of the planar light emitting element 10, and the outer peripheral end surface of the transparent substrate 11 forms the outer periphery 10 </ b> E of the planar light emitting element 10. The anode 14, the organic layer 15, and the cathode 16 are sequentially stacked on the back surface 13 of the transparent substrate 11. The sealing member 17 forms the back surface 19 of the planar light emitting element 10.

The transparent substrate 11 is composed of various glass substrates, for example. As a member constituting the transparent substrate 11, a film substrate such as PET (Polyethylene Terephthalate) or polycarbonate may be used. The anode 14 is a conductive film having transparency. In order to form the anode 14, ITO (Indium Tin Oxide) or the like is formed on the transparent substrate 11 by sputtering or the like. The anode 14 is formed by patterning the ITO film into a predetermined shape by photolithography or the like. The anode 14 is divided into two regions by patterning to form an electrode extraction portion 21 (for anode) and an electrode extraction portion 22 (for cathode).

The organic layer 15 (light emitting unit) can generate light (visible light) by being supplied with electric power. The organic layer 15 may be composed of a single light emitting layer, or may be composed of a hole transport layer, a light emitting layer, a hole blocking layer, an electron transport layer, and the like that are sequentially laminated. The cathode 16 is, for example, aluminum (AL). The cathode 16 is formed so as to cover the organic layer 15 by a vacuum deposition method or the like. In order to pattern the cathode 16 into a predetermined shape, a mask may be used during vacuum deposition.

An insulating layer 18 is provided between the cathode 16 and the anode 14 on the electrode extraction part 21 side so that the cathode 16 and the anode 14 are not short-circuited. The part of the cathode 16 opposite to the side on which the insulating layer 18 is provided is connected to the anode 14 on the electrode extraction part 22 side. The insulating layer 18 is formed in a desired pattern so as to cover a portion that insulates the anode 14 and the cathode 16 from each other using a photolithography method or the like after, for example, a SiO ₂ film is formed using a sputtering method. .

The sealing member 17 is made of an insulating resin or a glass substrate. The sealing member 17 is formed to protect the organic layer 15 from moisture and the like. The sealing member 17 seals substantially the whole of the anode 14, the organic layer 15, and the cathode 16 (that is, a member provided inside the planar light emitting element 10) on the transparent substrate 11. A part of the anode 14 is exposed from the sealing member 17 for electrical connection.

The portion exposed from the sealing member 17 of the anode 14 (on the left side in FIG. 4) constitutes an electrode extraction portion 21 (for anode). The electrode extraction part 21 and the anode 14 are made of the same material. The electrode extraction portion 21 is located on the outer periphery of the planar light emitting element 10. The portion of the cathode 16 exposed from the sealing member 17 (on the right side in FIG. 4) constitutes an electrode extraction portion 22 (for cathode). The electrode extraction part 22 and the anode 14 are made of the same material. The electrode extraction portion 22 is also located on the outer periphery of the planar light emitting element 10.

The electrode extraction part 21 and the electrode extraction part 22 are located on opposite sides of the organic layer 15. A divided region 20 (see FIG. 3) is formed between adjacent electrode extraction portions 21 and electrode extraction portions 22. A wiring pattern (not shown) is attached to the electrode extraction portion 21 and the electrode extraction portion 22 using soldering (silver paste) or the like.

The surface 12 of the planar light emitting element 10 configured as described above becomes a light emitting region. Electric power is supplied to the organic layer 15 of the planar light emitting element 10 from an external power supply device through a wiring pattern (not shown), electrode extraction parts 21 and 22, an anode 14 and a cathode 16. The light generated in the organic layer 15 is extracted from the surface 12 (light emitting surface) to the outside through the anode 14 and the transparent substrate 11.

In addition to transparent glass, the transparent substrate 11 is a transparent film such as polyimide, polyethylene naphthalate (PEN), polyethylene terephthalate (PET), polystyrene (PS), polyethersulfone (PES), polycarbonate (PC ), Polypropylene (PP) or the like.

The anode 14 is made of a light transmissive material such as indium titanium oxide (ITO) or polyethylenedioxythiophene (PEDOT). For the cathode 16, for example, aluminum (Al), lithium fluoride (LiF), a stack of Al and Ca, a stack of Al and LiF, a stack of Al and Ba, or the like is used.

The sealing member 17 is formed by laminating a plurality of layers of an inorganic thin film such as SiO ₂ , AL ₂ O ₃ , SiNx, and a flexible acrylic resin thin film on a film such as PET, PEN, PS, PES, and polyimide. Thus, those having gas barrier properties are used. Gold, silver, copper, or the like may be further laminated on the electrode extraction portion 21 and the electrode extraction portion 22.

(Arrangement of the planar light emitting panel 100)
With reference to FIGS. 5 and 6, the arrangement of the planar light emitting panel 100 with respect to the illumination panel 60 will be described. FIG. 5 is a schematic cross-sectional view showing the positional relationship between the lighting panel 60 and the planar light emitting panel, and FIG. 6 is a schematic cross-sectional diagram showing the positional relationship between the lighting panel 60 and the plurality of planar light emitting panels 100.

Referring to FIG. 5, in the present embodiment, the center of gravity position of the surface of planar light emitting panel 100 is designated as CP, and the light emission center line extending perpendicularly from CP to surface 100S of planar light emitting panel 100 is designated as L21. A point where L21 intersects with the lighting panel 60 is defined as a reference point P1. Each planar light emitting panel 100 is supported by the casing 50 such that the distance D1 from the surface 100S of the planar light emitting panel 100 on the light emission center line L21 to the reference point P1 is equal in each planar light emitting panel 100. ing.

In the present embodiment, since the planar light emitting panel 100 uses a square panel, the center of gravity of the surface of the planar light emitting panel 100 is the center of gravity (center point) CP where the diagonal lines intersect (FIG. 3). Reference). The same applies when the planar shape of the planar light emitting panel 100 is rectangular.

When the light emitted from each planar light emitting panel 100 (light source) is viewed on the surface of the illumination panel 60 and the distance from the light source to the illumination panel 60 is different, the luminance on the display surface of the illumination panel 60 is a distance. It changes according to. Therefore, when a plurality of light sources having different distances are arranged, a luminance difference, that is, luminance unevenness occurs on the surface of the illumination panel by the difference in the distance.

When a light diffusing plate is used for the illumination panel 60, the degree of light diffusion varies depending on the distance from the light source to the illumination panel, so that illumination such as how non-light emitting parts appear when the light source is tiled (arranged), etc. This greatly affects the conspicuous degree of luminance unevenness on the display surface of the panel 60.

However, as shown in the present embodiment, the distance D1 from the surface 100S of the planar light emitting panel 100 on the light emission center line L21 to the reference point P1 is equal in each planar light emitting panel 100. Thereby, the influence of the conspicuous degree of luminance unevenness can be suppressed to the minimum, and the uniformity can be improved.

In the present embodiment, as an example in which the distance D1 from the surface 100S of the planar light emitting panel 100 on the light emission center line L21 to the reference point P1 is equally arranged in each planar light emitting panel 100, the surface of the planar light emitting panel 100 Each planar light emitting panel 100 is supported by the housing 50 so that 100S passes through the reference point P1 and is parallel to a virtual plane L60 that intersects perpendicularly to the light emission center line L21.

As a result, as shown in FIG. 6, when the illumination panel 60 has a cylindrical surface shape and is curved so as to have a predetermined radius of curvature L11, the light emission gravity center line L21 of each planar light emission panel 100 is Each planar light emitting panel 100 is arranged so as to face the center point P11 of the curvature radius L11 of the lighting panel 60.

In this way, when the planar planar light emitting panel 100 (planar light source) is arranged with respect to the curved illumination panel 60, the difference in distance from each position on the planar light source with respect to the curved surface of the illumination panel 60 is minimized. By arranging the planar light sources so as to be (substantially parallel), it is possible to suppress the cause of luminance unevenness due to the difference in the distance to the curved surface due to the difference in position on the surface on the same planar light source.

By arranging the planar light emitting panel 100 (light source) as in the present embodiment, a plurality of planar light emitting panels 100 can be obtained without preparing a bent one in accordance with the shape of the curved lighting panel 60. By using the planar planar light emitting panel 100, it is possible to configure the internal illumination type illumination device 500 in which uneven brightness is less noticeable.

(Detailed configuration of the internal illumination device 500)
With reference to FIG. 7 and FIG. 8, the attachment structure to the housing of the planar light emitting unit 200 will be described. FIGS. 7 and 8 are a first cross-sectional schematic diagram and a second cross-sectional schematic diagram showing a mounting structure of the planar light emitting unit 200 employed in the internally-illuminated lighting device 500 to the housing 50, respectively.

In the internally illuminating device 500, each of the planar light emitting panels 100 described above is supported by a frame 210 and constitutes a planar light emitting unit 200 as a whole. Engagement shafts 220 are provided on both sides at the upper end of the frame 210. In FIG. 7, only the engagement shaft 220 positioned on the front side in the vertical direction of the paper surface is illustrated.

A hook-like hook 51 for engaging the engagement shaft 220 of the planar light emitting unit 200 is provided on the upper part of the inner surface of the casing 50. By engaging the engagement shaft 220 of the planar light emitting unit 200 with the hook 51, the planar light emitting unit 200 is in a state of being suspended from the hook 51 in a rotatable manner. The planar light emitting unit 200 can be easily attached to and detached from the hook 51.

The control board 400 of the planar light emitting panel 100 is disposed on the housing 50. The planar light emitting unit 200 is provided with a cable 310, and a connector C <b> 1 is provided at one end of the cable 310. A cable 320 is provided on the control board 400, and a connector C2 is provided at one end of the cable 320. By connecting the connector C <b> 1 and the connector C <b> 2, a drive current is sent from the control board 400 to the planar light emitting panel 100 in the planar light emitting unit 200.

The connection between the connector C1 and the connector C2 is performed in a state where the lower end is lifted and tilted while pivotally supporting the planar light emitting unit 200 with respect to the housing 50 (state shown in FIG. 7). At that time, if the wiring length of the cables 310 and 320 is the minimum length necessary for connection, the wiring will be stretched and difficult to work when lifted, so that the cable 310 and 320 have a slight margin. Is desirable.

After connecting the connector C1 and the connector C2, as shown in FIG. 8, the fixing bracket 230 provided at the lower end of the frame 210 is brought into contact with the fixing hook 52 provided in the lower part of the housing 50, so that the screw B is fixed. Fix with etc. Thereafter, the lighting panel 60 is attached to the housing 50.

With the above configuration, the planar light emitting unit 200 can be easily attached to the housing 50. Furthermore, maintenance work of the planar light emitting unit 200 can be easily performed.

(Embodiment 2)
Next, with reference to FIG. 9, an internally illuminated illumination device 500 </ b> A according to Embodiment 2 will be described. FIG. 9 is a schematic cross-sectional view showing the positional relationship between the illumination panel 60 and the plurality of planar light emitting panels 100 of the internally illuminated illumination device 500A.

In the second embodiment, as in the first embodiment, the planar light emitting panel 100 has a light emitting center of gravity that extends perpendicularly from the center of gravity of the surface of the planar light emitting panel 100 to the surface 100S of the planar light emitting panel 100. With the point where the line L21 intersects the lighting panel 60 as a reference point P1, the distance D1 from the surface 100S of the planar light emitting panel 100 on the light emission center line L21 to the reference point P1 is equal in each planar light emitting panel 100. Each planar light emitting panel 100 is supported by the housing 50.

The difference from the first embodiment is that each planar light emitting panel 100 is supported by the housing 50 such that the respective surfaces 100S of the plurality of planar light emitting panels 100 are parallel to each other. Other configurations are the same as those of the internal illumination type illumination device 500 according to the first embodiment.

Thus, even when the planar light emitting panel 100 is arranged, the distance D1 from the surface 100S of each planar light emitting panel 100 to the reference point P1 on the light emission center line L21 is equal in each planar light emitting panel 100. The occurrence of uneven brightness in the lighting panel 60 can be suppressed and the uniformity can be improved. Since the planar light emitting panels 100 are arranged in parallel to each other, the planar light emitting unit can be easily manufactured.

In the said Embodiment 1 and 2, although the case where the internal illumination type illuminating device 500,500A was arrange | positioned to the inner surface (concave surface) side of the wall 1000 which has a curved shape was demonstrated, as shown to FIG. 10 and FIG. You may arrange | position an internal illumination type illuminating device in the outer surface (convex surface) side of the wall 1000 which has a curved shape.

The internal illumination type illumination device 500B shown in FIG. 10 has the configuration of the internal illumination type illumination device 500 in Embodiment 1 provided on the outer surface side of the wall 1000. In this case, the outer surface (irradiation surface) of the illumination panel is curved in a convex shape. Also in this configuration, as in the first embodiment, each surface has the same distance D1 from the surface 100S of each planar light emitting panel 100 on the light emission center line L21 to the reference point P1 in each planar light emitting panel 100. Since the light emitting panel 100 is disposed, it is possible to suppress the occurrence of luminance unevenness in the lighting panel 60 and improve the uniformity.

An internal illumination type illumination device 500C shown in FIG. 11 has the configuration of the internal illumination type illumination device 500A according to the second embodiment provided on the outer surface side of the wall 1000. Even in this configuration, it is possible to obtain the same operational effects as those of the first embodiment.

As described above, according to each embodiment, in the planar light emitting panel 100, the light emission center line L21 extending perpendicularly to the surface 100S of the planar light emitting panel 100 from the position of the center of gravity of the surface of the planar light emitting panel 100 has the illumination panel 60. Each planar light emitting panel is set such that the distance D1 from the surface 100S of the planar light emitting panel 100 on the light emission center line L21 to the reference point P1 is equal in each planar light emitting panel 100, with the point intersecting with the reference point P1. 100 is supported by the housing 50.

Thereby, since the distance D1 from the surface 100S of the planar light emitting panel 100 on the light emission center line L21 to the reference point P1 is equal in each planar light emitting panel 100, the influence of the conspicuous degree of luminance unevenness is minimized. , Uniformity can be improved.

The light source is not limited to an organic EL panel, and a planar planar light-emitting panel (light source) can be used. Generally, a large number of planar rigid panels, flexible panels, and plural planar shapes are available. The present invention can also be applied to a light-emitting panel obtained by modularizing a light-emitting panel, or a general flexible panel, and a light source having high availability can be selected and used according to the application.

As mentioned above, although the internal illumination type illuminating device in each embodiment of this invention was demonstrated, it should be thought that embodiment disclosed this time is an illustration and restrictive at no points. Therefore, the scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

DESCRIPTION OF SYMBOLS 10 Planar light emitting element, 11 Transparent substrate, 13 Back surface, 14 Anode, 15 Organic layer, 16 Cathode, 17 Sealing member, 18 Insulating layer, 19 Back surface, 20 Divided area, 21, 22 Electrode extraction part, 50 Housing, 51 Hook, 52 fixed hook, 60 lighting panel, 100 planar light emitting panel, 200 planar light emitting unit, 210 frame, 220 engaging shaft, 230 fixed bracket, 310, 320 cable, 400 control board, 500, 500A, 500B, 500C Illuminated lighting device, 1000 walls.

Claims (7)

A plurality of planar light emitting panels;
A housing that supports the plurality of planar light emitting panels;
A curved lighting panel supported by the housing and irradiated with light emitted from the plurality of planar light emitting panels from the inner surface toward the outer surface;
A plurality of light emission centroid lines on the light emission centroid lines with reference to a point where a light emission centroid line extending perpendicularly to the surface of the planar light emission panel from the position of the center of gravity of each surface of the plurality of planar light emission panels intersects the illumination panel An internally illuminated lighting device in which a plurality of the planar light emitting panels are supported by the casing so that the distances from the respective surfaces of the planar light emitting panels to the reference point are equal. A plurality of the planar light emitting panels are supported by the casing so that the surface of the planar light emitting panel is parallel to a virtual plane that passes through the reference point and intersects the light emission center line perpendicularly. The internally illuminated lighting device according to claim 1. The internally illuminated lighting device according to claim 1, wherein the plurality of planar light emitting panels are supported by the casing so that the surfaces of the plurality of planar light emitting panels are parallel to each other. 4. The internally illuminated lighting device according to claim 1, wherein each of the plurality of planar light emitting panels is a single planar light emitting element or a combination of a plurality of planar light emitting elements. 5. . The internal illumination type illumination device according to any one of claims 1 to 4, wherein the illumination panel has a cylindrical surface shape. The internal illumination device according to any one of claims 1 to 5, wherein an outer surface of the illumination panel has a convex shape. The internal illumination type illumination device according to any one of claims 1 to 6, wherein the illumination panel has a design.

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