# US 9,518,717 B2 · Lighting device

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- Number: US 9,518,717 B2
- Document ID: US9518717B2
- Status: Granted
- Kind: B2
- Application number: 14/185,049
- Filed: 2014-02-20
- Published: 2014-09-04
- Granted: 2016-12-13
- Earliest claimed: 2013-03-01
- Assignees: Panasonic Intellectual Property Management Co., Ltd.
- Applicants: Panasonic Corporation
- Inventors: Osamu Tanahashi; Yoshiyuki Miyake; Tadashi Murakami; Hideharu Kawachi
- Web page: https://patentgrep.com/patent/US9518717B2

## CPC

- F21V 7/00: Reflectors for light sources (characterised by cooling arrangements F21V29/505)
- F21V 13/02: Combinations of only two kinds of elements
- H01L 51/524
- H01L 51/5271
- F21S 8/033: {the surface being a wall or like vertical structure, e.g. building facade}
- F21S 8/04: intended only for mounting on a ceiling or the like overhead structures (F21S8/02 takes precedence; {details of ceiling bases F21V21/03})
- F21Y 2105/00: Planar light sources
- F21Y 2115/15: Organic light-emitting diodes [OLED]
- H01L 51/5268
- H01L 2251/5361
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- H01L
- F21S: NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21Y: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED

## Abstract

A lighting device 1 includes a planar light-emitting panel 4 and a translucent material 5 disposed on a light-emitting surface side of the planar light-emitting panel 4. The planar light-emitting panel 4 has a light-emitting region 4A and a non-light-emitting region 4B. The translucent material 5 has a reflection part 51 in a region facing the non-light-emitting region 4B. Light emitted from the planar light-emitting panel 4 and guided into the translucent material 5 is reflected by the reflection part 51 and emitted to the front side of the non-light-emitting region 4B. Accordingly, the front side of the non-light-emitting region 4B does not become a dark section, so that it is capable of increasing the light irradiation region and giving the light irradiation surface having uniform illuminance even if the plural lighting devices 1 are arranged in a matrix form.

## Claims

### Claim 1

A lighting device, comprising:
a planar light-emitting panel having a light-emitting surface on one side; and
a flat plate-shaped translucent material disposed on the light-emitting surface side of the planar light-emitting panel, wherein
the planar light-emitting panel has a light-emitting region from which light is emitted and a non-light-emitting region located around the light-emitting region from which light is not emitted,
the translucent material has a reflection part which is provided in a region facing the non-light-emitting region and reflects light,
the reflection part is extended toward a region which faces the light-emitting region of the planar light-emitting panel, and
a region surrounded by the reflection part becomes smaller than the light-emitting region.

### Claim 2 (depends on 1)

The lighting device according to claim 1, wherein
the reflection part is formed by applying a white coating material or sticking a white tape on the translucent material.

### Claim 3 (depends on 1)

The lighting device according to claim 1, wherein
the translucent material further has a side reflection part which is provided at a side surface of the translucent material and reflects light.

### Claim 4 (depends on 1)

The lighting device according to claim 1, wherein
a light outputting surface of the translucent material is prepared as a light diffusion surface which diffuses light.

### Claim 5 (depends on 1)

The lighting device according to claim 1, wherein
a light diffusion layer which diffuses light is further added onto a light outputting surface of the translucent material.

### Claim 6 (depends on 1)

The lighting device according to claim 1, wherein
the translucent material contains a light diffusion agent which diffuses light.

### Claim 7 (depends on 1)

The lighting device according to claim 1, wherein
the translucent material and the planar light-emitting panel are adhered or stuck to each other via a translucent resin.

### Claim 8 (depends on 1)

The lighting device according to claim 1, wherein
the translucent material further has a peripheral frame which extends from a periphery of the translucent material so as to cover a side surface of the planar light-emitting panel.