# US 2013/0278901 A1 · Light emitting apparatus, illuminator, and projector

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 2013/0278901 A1
- Document ID: US20130278901A1
- Status: Published application
- Kind: A1
- Application number: 13/923,600
- Filed: 2013-06-21
- Published: 2013-10-24
- Earliest claimed: 2010-07-14
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Hiroyasu KASEYA
- Web page: https://patentgrep.com/patent/US20130278901A1

## CPC

- F21V 13/02: Combinations of only two kinds of elements
- G03B 21/20: Lamp housings
- G03B 21/2013: {Plural light sources}
- G03B 21/2033: {LED or laser light sources}
- G03B 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- G03B: APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D)

## Abstract

A light emitting apparatus includes a first rod integrator and a second rod integrator supported by a support substrate and a light emitting device disposed between the first rod integrator and the second rod integrator. The light emitting device emits a plurality of light beams to be incident on the first rod integrator and a plurality of light beams to be incident on the second rod integrator. Each of the rod integrators has a light incident surface on which the plurality of light beams are incident, a bent portion that changes the propagating direction of the plurality of incident light beams, and a light exiting surface through which the plurality of light beams mixed with each other exit.

## Claims

### Claim 1

A light emitting apparatus comprising:
a first rod integrator and a second rod integrator; and
a light emitting device disposed between the first rod integrator and the second rod integrator,
wherein the light emitting device emits first light and second light to be incident on the first rod integrator, and
third light and fourth light to be incident on the second rod integrator,
the first rod integrator has:
a first light incident surface on which the first light and the second light are incident,
a first bent portion that changes the propagating direction of the first light and the second light, and
a first light exiting surface through which the first light and the second light exit toward a predetermined area, and
the second rod integrator has:
a second light incident surface on which the third light and the fourth light are incident,
a second bent portion that changes the propagating direction of the third light and the fourth light, and
a second light exiting surface through which the third light and the fourth light exit toward the predetermined area.

### Claim 2 (depends on 1)

The light emitting apparatus according to claim 1, further comprising:
a first cylindrical lens disposed in the optical paths of the first light and the second light; and
a second cylindrical lens disposed in the optical paths of the third light and the fourth light.

### Claim 3 (depends on 1)

The light emitting apparatus according to claim 1, further comprising:
a first cylindrical lens disposed in the optical path of the light having exited through the first light exiting surface; and
a second cylindrical lens disposed in the optical path of the light having exited through the second light exiting surface.

### Claim 4 (depends on 1)

The light emitting apparatus according to claim 1, further comprising:
a first polarization converter that converts the light having exited through the first light exiting surface into first polarized light; and
a second polarization converter that converts the light having exited through the second light exiting surface into second polarized light,
wherein the first polarized light and the second polarized light are polarized in the same direction.

### Claim 5 (depends on 1)

The light emitting apparatus according to claim 1,
wherein the light emitting device is a super luminescent diode.

### Claim 6 (depends on 1)

The light emitting apparatus according to claim 1,
wherein the first light exiting surface and the second light exiting surface are oriented in the same direction.

### Claim 7 (depends on 1)

An illuminator comprising:
the light emitting apparatus according to claim 1;
a first lens that causes the light having exited through the first light exiting surface of the first rod integrator in the light emitting apparatus to diverge;
a second lens that causes the light having exited through the second light exiting surface of the second rod integrator in the light emitting apparatus to diverge;
a third lens that superimposes the light having exited through the first lens over the light having exited through the second lens; and
a fourth lens that causes the light superimposed by the third lens to converge.

### Claim 8 (depends on 7)

A projector comprising:
the illuminator according to claim 7;
a light modulation apparatus that modulates the light having exited from the illuminator in accordance with image information; and
a projection apparatus that projects an image formed by the light modulation apparatus.