# US 10,372,027 B2 · Illuminator and projector

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- Number: US 10,372,027 B2
- Document ID: US10372027B2
- Status: Granted
- Kind: B2
- Application number: 15/904,865
- Filed: 2018-02-26
- Published: 2018-09-06
- Granted: 2019-08-06
- Earliest claimed: 2017-03-06
- Assignees: Seiko Epson Corporation
- Applicants: Seiko Epson Corporation
- Inventors: Koichi Akiyama
- Web page: https://patentgrep.com/patent/US10372027B2

## CPC

- G03B 21/208: {Homogenising, shaping of the illumination light}
- G03B 21/2013: {Plural light sources}
- G03B 21/204: {using secondary light emission, e.g. luminescence or fluorescence (using different colours G03B33/00; if related to video signals H04N9/3197)}
- G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)}
- 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

An illuminator includes first and second light emitting devices that emit first and second light beams, respectively, first and second lens arrays, a light ray combining element that combines at least parts of the first and second light beams having passed through the first and second lens arrays with each other to produce a combined light ray flux, a light collection lens, and a diffused light producing element on which the combined light ray flux having passed through the light collection lens is incident.

## Claims

### Claim 1

An illuminator comprising:
a first light emitting device that emits a first light beam;
a second light emitting device that emits a second light beam;
a first lens array on which the first light beam is incident;
a second lens array on which the second light beam is incident;
a light ray combining element that combines the first light beam having passed through the first lens array with at least part of the second light beam having passed through the second lens array to produce a combined light ray flux;
a light collection lens on which the combined light ray flux is incident; and
a diffused light producing element on which the combined light ray flux having passed through the light collection lens is incident,
wherein a cross section of the first light beam that is perpendicular to an optical axis of the first light beam has a major axis,
a cross section of the second light beam that is perpendicular to an optical axis of the second light beam has a major axis, and
the first light emitting device and the second light emitting device are so provided that a plane containing the major axis of the first light beam and the optical axis of the first light beam and so located as to face a front side of the first lens array intersects a plane containing the major axis of the second light beam and the optical axis of the second light beam and so located as to face a front side of the second lens array.

### Claim 2 (depends on 1)

The illuminator according to claim 1,
wherein an angle of rotation of the first light emitting device viewed in a direction parallel to the optical axis of the first light emitting device differs from an angle of rotation of the second light emitting device viewed in a direction parallel to the optical axis of the second light emitting device.

### Claim 3 (depends on 1)

The illuminator according to claim 1, further comprising;
a first light source unit including a plurality of light emitting devices including the first light emitting device; and
a second light source unit including a plurality of light emitting devices including the second light emitting device,
wherein an angle of rotation of the first light source unit viewed in a direction parallel to the optical axis of the first light emitting device differs from an angle of rotation of the second light source unit viewed in a direction parallel to the optical axis of the second light emitting device.

### Claim 4 (depends on 1)

The illuminator according to claim 1,
wherein when a plain containing a direction in which the first lens array and the second lens array are arranged and a direction of a principal ray of the combined light ray flux is defined as a reference plane, an angle between the major axis of the cross section of the first light beam and the reference plane is greater than an angle between the major axis of the cross section of the second light beam and the reference plane, and
an optical path length of the first light beam between the first lens array and the light collection lens is smaller than an optical path length of the second light beam between the second lens array and the light collection lens.

### Claim 5 (depends on 1)

The illuminator according to claim 1,
wherein the diffused light producing element includes a phosphor.

### Claim 6 (depends on 1)

A projector comprising:
the illuminator according to claim 1;
a light modulator that modulates light from the illuminator in accordance with image information to produce image light; and
a projection system that projects the image light.

### Claim 7 (depends on 2)

A projector comprising:
the illuminator according to claim 2;
a light modulator that modulates light from the illuminator in accordance with image information to produce image light; and
a projection system that projects the image light.

### Claim 8 (depends on 3)

A projector comprising:
the illuminator according to claim 3;
a light modulator that modulates light from the illuminator in accordance with image information to produce image light; and
a projection system that projects the image light.

### Claim 9 (depends on 4)

A projector comprising:
the illuminator according to claim 4;
a light modulator that modulates light from the illuminator in accordance with image information to produce image light; and
a projection system that projects the image light.