# US 11,444,430 B2 · Light emission device

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- Number: US 11,444,430 B2
- Document ID: US11444430B2
- Status: Granted
- Kind: B2
- Application number: 17/016,202
- Filed: 2020-09-09
- Published: 2021-03-25
- Granted: 2022-09-13
- Earliest claimed: 2019-09-20
- Assignees: Nichia Corporation
- Applicants: Nichia Corporation
- Inventors: Akinori Hara; Toshiaki Yamashita
- Web page: https://patentgrep.com/patent/US11444430B2

## CPC

- H01S 5/0267: {Integrated focusing lens (H01S5/18388 takes precedence)}
- G02B 3/04: with continuous faces that are rotationally symmetrical but deviate from a true sphere {, e.g. so called "aspheric" lenses}
- G02B 19/0066: {in the form of an LED array}
- G02B 27/30: Collimators
- H01S 5/0087: {for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials}
- H01S 5/02212: Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis
- H01S 5/02253: using lenses
- H01S 5/02255: using beam deflecting elements
- H01S 5/4025: {Array arrangements, e.g. constituted by discrete laser diodes or laser bar (H01S5/42 takes precedence)}
- H01S 5/4031: {Edge-emitting structures}
- H01S 5/32341: {blue laser based on GaN or GaP}
- H01S: DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A light emission device includes: a plurality of semiconductor light-emitting elements; an optical element configured to collimate light emitted from each of the plurality of semiconductor light-emitting elements and output a plurality of collimated beams; a converging portion having an aspheric surface configured to converge the plurality of collimated beams; and a wavelength-converting portion including a transmissive region and a reflective region that surrounds the transmissive region, the transmissive region including a light-incident surface at which the plurality of collimated beams enter, wherein the transmissive region includes a phosphor adapted to be excited by the plurality of collimated beams that have been converged by the converging portion.

## Claims

### Claim 1

A light emission device comprising:
a plurality of semiconductor light-emitting elements;
an optical element configured to collimate light emitted from each of the plurality of semiconductor light-emitting elements and output a plurality of collimated beams;
a converging portion having an aspheric surface configured to converge the plurality of collimated beams; and
a wavelength-converting portion comprising a transmissive region, and a reflective region that surrounds the transmissive region, the transmissive region including a light-incident surface at which the plurality of collimated beams that have been converged by the converging portion enter, wherein the transmissive region includes a phosphor adapted to be excited by the plurality of collimated beams that have been converged by the converging portion; wherein:
the converging portion is shaped such that:
the plurality of collimated beams that have been converged by the converging portion comprises:
at least one pair of outer collimated beams radiated toward end portions of the light-incident surface, and
one or more inner collimated beams interposed between the outer collimated beams, and
the outer collimated beams are more diverged than the one or more inner collimated beams.

### Claim 2 (depends on 1)

The light emission device of claim 1, wherein the light-incident surface of the transmissive region intersects an optical axis of the converging portion, and is located off a focal point of the converging portion.

### Claim 3 (depends on 1)

The light emission device of claim 1, wherein the plurality of collimated beams output from the optical element are parallel to one another.

### Claim 4 (depends on 1)

The light emission device of claim 1, wherein the plurality of semiconductor light-emitting elements are arranged in one or more rows and two or more columns or in two or more rows and one or more columns along a plane that is perpendicular to an optical axis of the converging portion.

### Claim 5 (depends on 4)

The light emission device of claim 4, wherein a surface shape of the converging portion is adapted to a shape of the light-incident surface of the transmissive region.

### Claim 6 (depends on 1)

The light emission device of claim 1, wherein parts of the outer collimated beams are incident on the reflective region.

### Claim 7 (depends on 1)

The light emission device of claim 1, wherein,
the light-incident surface of the transmissive region has a rectangular shape;
the converging portion is an aspherical lens; and
the aspherical lens has a conic constant k such that −15<k<0 or 0<k<+6.

### Claim 8 (depends on 7)

The light emission device of claim 7, wherein a focal point of the aspherical lens is located between the aspherical lens and the light-incident surface of the transmissive region.

### Claim 9 (depends on 7)

The light emission device of claim 7, wherein the aspherical lens has a conic constant k such that k≥0.5.

### Claim 10 (depends on 1)

The light emission device of claim 1, further comprising:
a housing in which the plurality of semiconductor light-emitting elements, the optical element, and the converging portion are housed,
wherein the housing comprises a lid configured to support the wavelength-converting portion, the lid having a throughhole through which the plurality of collimated beams that have been converged by the converging portion are allowed to pass.

### Claim 11 (depends on 10)

The light emission device of claim 10, wherein the wavelength-converting portion is supported by an edge of the throughhole of the lid.

### Claim 12 (depends on 10)

The light emission device of claim 10, wherein the housing comprises a sidewall portion and a support that protrudes inward from the sidewall portion and supports the converging portion.

### Claim 13 (depends on 1)

The light emission device of claim 1, wherein the plurality of semiconductor light-emitting elements are laser diodes.

### Claim 14 (depends on 13)

The light emission device of claim 13, further comprising a package in which the plurality of laser diodes are hermetically sealed.

### Claim 15 (depends on 1)

The light emission device of claim 1, wherein the reflective region is made of a ceramic.

### Claim 16 (depends on 15)

The light emission device of claim 15, wherein the reflective region is made of aluminum oxide as a main material.

### Claim 17

A light emission device comprising:
a plurality of semiconductor light-emitting elements;
an optical element configured to collimate light emitted from each of the plurality of semiconductor light-emitting elements and output a plurality of collimated beams;
a converging portion having an aspheric surface configured to converge the plurality of collimated beams; and
a wavelength-converting portion comprising a transmissive region, and a reflective region that surrounds the transmissive region, the transmissive region including a light-incident surface at which the plurality of collimated beams that have been converged by the converging portion enter, wherein the transmissive region includes a phosphor adapted to be excited by the plurality of collimated beams that have been converged by the converging portion; wherein:
the light-incident surface of the transmissive region has a rectangular shape;
the converging portion is shaped such that:
the plurality of collimated beams that have been converged by the converging portion comprises:
at least one pair of outer collimated beams radiated toward corners of the light-incident surface, and
one or more inner collimated beams interposed between the outer collimated beams, and
the outer collimated beams are more diverged than the one or more inner collimated beams.

### Claim 18 (depends on 17)

The light emission device of claim 17, wherein the light-incident surface of the transmissive region intersects an optical axis of the converging portion, and is located off a focal point of the converging portion.

### Claim 19 (depends on 17)

The light emission device of claim 17, wherein the plurality of semiconductor light-emitting elements are arranged in one or more rows and two or more columns or in two or more rows and one or more columns along a plane that is perpendicular to an optical axis of the converging portion.

### Claim 20 (depends on 17)

The light emission device of claim 17, wherein parts of the outer collimated beams are incident on the reflective region.