# US 12,111,562 B2 · Projection device

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- Number: US 12,111,562 B2
- Document ID: US12111562B2
- Status: Granted
- Kind: B2
- Application number: 17/540,473
- Filed: 2021-12-02
- Published: 2022-03-24
- Granted: 2024-10-08
- Earliest claimed: 2019-06-28
- Assignees: FUJIFILM Corporation
- Applicants: FUJIFILM Corporation
- Inventors: Hironobu Kayano; Shoki Kasahara
- Web page: https://patentgrep.com/patent/US12111562B2

## CPC

- G03B 21/145: {Housing details, e.g. position adjustments thereof}
- G03B 21/2013: {Plural light sources}
- G02B 19/00: Condensers, {e.g. light collectors or similar non-imaging optics}(for microscopes G02B21/08)
- G03B 21/006: {using LCD's}
- G03B 21/142: {Adjusting of projection optics}
- G03B 21/16: Cooling; Preventing overheating
- G03B 21/2033: {LED or laser 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 21/2066: {Reflectors in illumination beam (in projection beam G03B21/28)}
- G03B 21/2073: {Polarisers in the lamp house (peculiar to electronic spatial light modulators H04N9/3197)}
- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- H04N 5/74: Projection arrangements for image reproduction, e.g. using eidophor
- G02F 2203/01: transmissive
- 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)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION
- 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 projection device includes: a housing that includes a base portion and a protruding portion protruding from the base portion; a projection lens that projects image light onto a projection target, is disposed to face the protruding portion, and is mounted on the base portion; a prism that is disposed in the base portion to face an incident-side end part of the projection lens; a plurality of transmission type electro-optical elements that are arranged to face a plurality of side surfaces of the prism, respectively; and a semiconductor light source that is disposed in the protruding portion and generates the image light.

## Claims

### Claim 1

A projection device, comprising:
a housing that includes a base portion and a protruding portion protruding from the base portion;
a projection lens that projects image light onto a projection target, is disposed to face the protruding portion, and is mounted on the base portion;
a prism that is disposed in the base portion to face an incident-side end part of the projection lens;
a plurality of transmission type electro-optical elements that are arranged to face a plurality of side surfaces of the prism, respectively;
a semiconductor light source that is disposed in the protruding portion and generates the image light; and
a wavelength conversion element that is provided in the base portion and converts a wavelength of light emitted from the semiconductor light source,
wherein the wavelength conversion element is disposed to be close to a side surface, which is closer to the protruding portion, of two side surfaces of the base portion facing each other.

### Claim 2

A projection device, comprising:
a housing that includes a base portion and a protruding portion protruding from the base portion;
a projection lens that projects image light onto a projection target, is disposed to face the protruding portion, and is mounted on the base portion;
a prism that is disposed in the base portion to face an incident-side end part of the projection lens;
a plurality of transmission type electro-optical elements that are arranged to face a plurality of side surfaces of the prism, respectively;
a semiconductor light source that is disposed in the protruding portion and generates the image light; and
a control board that is disposed in the base portion,
wherein, the control board is disposed to be close to a side surface, which is farther from the protruding portion, of two side surfaces of the base portion facing each other.