# US 11,906,156 B2 · Light emitting device

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- Number: US 11,906,156 B2
- Document ID: US11906156B2
- Status: Granted
- Kind: B2
- Application number: 18/157,217
- Filed: 2023-01-20
- Published: 2023-05-18
- Granted: 2024-02-20
- Earliest claimed: 2016-09-16
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Motokazu Yamada; Takeshi Tamura; Hiroshi Fujimori
- Web page: https://patentgrep.com/patent/US11906156B2

## CPC

- F21V 7/22: characterised by materials, surface treatments or coatings, e.g. dichroic reflectors
- F21V 7/0083: {Array of reflectors for a cluster of light sources, e.g. arrangement of multiple light sources in one plane (combination of two or more reflectors F21V7/0025)}
- F21V 9/30: Elements containing photoluminescent material distinct from or spaced from the light source (shades F21V1/17; globes, bowls or cover glasses F21V3/08, F21V3/12; refractors F21V5/10; reflectors F21V7/26, F21V7/30; elements with provision for controlling the spectral properties or intensity F21V9/40)
- F21V 13/08: the elements being filters or photoluminescent elements and reflectors
- G02F 1/133603: {with LEDs}
- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133606: {including a specially adapted diffusing, scattering or light controlling members}
- G02F 1/133611: {including means for improving the brightness uniformity}
- F21Y 2105/16: square or rectangular, e.g. for light panels
- F21Y 2115/10: Light-emitting diodes [LED]
- F21Y 2115/30: Semiconductor lasers
- G02F 1/133557: {Half-mirrors}
- G02F 1/133614: {using photoluminescence, e.g. phosphors illuminated by UV or blue light}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- 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 light emitting device includes: a mounting board; a light source positioned on the mounting board; a light diffusion plate; a diffuse reflector positioned between the mounting board and the light diffusion plate, and above at least part of an emission face of the light source; and a wavelength conversion layer positioned on or above the diffuse reflector.

## Claims

### Claim 1

A light emitting device comprising:
a mounting board;
a light source positioned on the mounting board;
a light diffusion plate;
a diffuse reflector positioned between the mounting board and the light diffusion plate, and above at least part of an emission face of the light source, wherein:
in a top view, the diffuse reflector overlaps said at least part of the emission face of the light source,
the diffuse reflector comprises a resin, and reflecting particles dispersed in the resin, and
a distance from an upper surface of the mounting board to a lowermost surface of the diffuse reflector is greater than an overall height of the light source from the upper surface of the mounting board; and
a wavelength conversion layer positioned on or above the diffuse reflector.

### Claim 2 (depends on 1)

The light emitting device according to claim 1, further comprising:
a plurality of light sources positioned on the mounting board, the plurality of light sources comprising the light source; and
a plurality of diffuse reflectors positioned between the mounting board and the light diffusion plate, and above at least parts of respective emission faces of the plurality of light sources, the plurality of diffuse reflectors comprising the diffuse reflector.

### Claim 3 (depends on 2)

The light emitting device according to claim 2, wherein:
each of the diffuse reflectors is positioned in an area that, in the top view, is larger than and includes the emission face of each light source.

### Claim 4 (depends on 1)

The light emitting device according to claim 1, further comprising:
first and second prism array layers stacked with each other, the first and second prism array layers positioned on or above the wavelength conversion layer.

### Claim 5 (depends on 1)

The light emitting device according to claim 1, wherein:
the diffuse reflector has a circular shape in the top view.

### Claim 6 (depends on 1)

The light emitting device according to claim 1, further comprising:
a light reflective member positioned on or above the mounting board, the light reflective member comprising a hole that surrounds the light source.

### Claim 7 (depends on 6)

The light emitting device according to claim 6, wherein:
the light reflective member comprises a top surface that is higher than the emission face of the light source the light source.

### Claim 8 (depends on 1)

The light emitting device according to claim 1, wherein:
the reflecting particles consist of oxide substance particles.

### Claim 9 (depends on 1)

The light emitting device according to claim 1, wherein:
the diffuse reflector does not comprise a phosphor.

### Claim 10 (depends on 1)

The light emitting device according to claim 1, wherein:
the reflecting particles consist of titanium oxide particles.

### Claim 11 (depends on 1)

The light emitting device according to claim 1, wherein:
the light source comprises a cover member that covers the emission face of the light source.