# US 9,753,211 B2 · Light emitting device, surface light source device and display apparatus

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- Number: US 9,753,211 B2
- Document ID: US9753211B2
- Status: Granted
- Kind: B2
- Application number: 14/704,147
- Filed: 2015-05-05
- Published: 2015-11-12
- Granted: 2017-09-05
- Earliest claimed: 2014-05-08
- Assignees: Enplas Corporation
- Applicants: Enplas Corporation
- Inventors: Hiroshi Takatori; Yu Kamijo
- Web page: https://patentgrep.com/patent/US9753211B2

## CPC

- G02B 6/0051: {Diffusing sheet or layer}
- G02B 6/0055: {Reflecting element, sheet or layer}
- G02B 6/0073: {Light emitting diode [LED]}
- G02F 1/133603: {with LEDs}
- G02F 1/133605: {including specially adapted reflectors}
- G02F 1/133607: {the light controlling member including light directing or refracting elements, e.g. prisms or lenses}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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

## Abstract

A light emitting device includes a substrate in which a specular reflection area that specularly reflects reaching light is disposed on one surface, a light emitting element disposed on the substrate to emit light at least from a side surface, and a light flux controlling member disposed over the light emitting element to control a distribution of light to be emitted from the light emitting element. The light flux controlling member includes a rear surface disposed closer to the substrate, an incidence surface being an inner surface of a recess opening toward the rear surface and receiving light emitted from the light emitting element, and an emission surface emitting at least a part of the light incident through the incidence surface toward an outside. An outer edge portion of the specular reflection area is positioned outside an opening edge portion of the recess.

## Claims

### Claim 1

A light emitting device comprising:
a substrate in which a specular reflection area that specularly reflects reaching light is disposed on one surface;
a light emitting element disposed on the substrate to emit light at least from a side surface; and
a light flux controlling member disposed over the light emitting element to control a distribution of light to be emitted from the light emitting element,
wherein:
the light flux controlling member includes:
a rear surface disposed closer to the substrate,
an incidence surface being an inner surface of a recess opening toward the rear surface and receiving light emitted from the light emitting element, and
an emission surface emitting at least a part of the light incident through the incidence surface toward an outside;
an outer edge portion of the specular reflection area is positioned outside an opening edge portion of the recess; and
a part of light emitted from the side surface of the light emitting element reaches the substrate, and then, is specularly reflected at the specular reflection area to enter the light flux controlling member through the incidence surface.

### Claim 2 (depends on 1)

The light emitting device according to claim 1, wherein:
the emission surface is disposed opposite to the rear surface; and
the outer edge portion of the specular reflection area is disposed inside a position where a peak amount of light is indicated which is Fresnel-reflected at the emission surface and reaches the rear surface, out of light emitted from the light emitting element and being incident through the incidence surface.

### Claim 3 (depends on 1)

A surface light source device comprising:
the light emitting device according to claim 1; and
a light diffusing member that transmits light from the light emitting device while diffusing the light.

### Claim 4 (depends on 3)

A display apparatus comprising:
the surface light source device according to claim 3; and
a display member to be irradiated with light emitted from the surface light source device.

### Claim 5 (depends on 2)

A surface light source device comprising:
the light emitting device according to claim 2; and
a light diffusing member that transmits light from the light emitting device while diffusing the light.