# US 8,540,371 B2 · Display device

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- Number: US 8,540,371 B2
- Document ID: US8540371B2
- Status: Granted
- Kind: B2
- Application number: 13/110,288
- Filed: 2011-05-18
- Published: 2011-11-24
- Granted: 2013-09-24
- Earliest claimed: 2010-05-21
- Assignees: Stanley Electric Co., Ltd.
- Applicants: Takashi Sugiyama
- Inventors: Takashi Sugiyama
- Web page: https://patentgrep.com/patent/US8540371B2

## CPC

- G03B 21/28: Reflectors in projection beam {(in illumination beam G03B21/2066)}
- G02B 5/136: plural reflecting elements forming part of a unitary body (G02B5/124 takes precedence)
- G02B 30/56: by projecting aerial or floating images
- 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

## Abstract

A display device includes: a wall defining a viewer-side space; an observed object arranged in an object-side space partitioned off the viewer-side space by a portion of the wall; an imaging optical system of real specular image including a semitransparent substrate with a plane of symmetry for defining the viewer-side space and the object-side space as the portion of the wall to image a real image of the observed object in the viewer-side space with light passing through the substrate; a screen surface having a function of diffuse reflection and provided with the substrate so as to face the viewer-side space; and a projector optical system projecting an image on the screen surface in the viewer-side space.

## Claims

### Claim 1

A display device, comprising:
a wall defining a viewer-side space;
an observed object arranged in an object-side space partitioned off the viewer-side space by a portion of the wall;
an imaging optical system of real specular image including a semitransparent substrate with a plane of symmetry for defining the viewer-side space and the object-side space as the portion of the wall to image a real image of the observed object in the viewer-side space with light passing through the substrate;
a screen surface having a function of diffuse reflection and provided with the substrate so as to face the viewer-side space; and
a projector optical system projecting an image on the screen surface in the viewer-side space.

### Claim 2 (depends on 1)

The display device according to claim 1, wherein the screen surface transmits light rays travelling from the observed object thereto or the light rays emitted by the observed object and bended to pass through the plane of symmetry.

### Claim 3 (depends on 1)

The display device according to claim 1, wherein the imaging optical system of real specular image is an optical element functioning as a dihedral corner reflector.

### Claim 4 (depends on 1)

The display device according to claim 1, wherein the imaging optical system of real specular image is formed by a combination of a half mirror and a retroreflector array.

### Claim 5 (depends on 1)

The display device according to claim 1, wherein the observed object is a three dimensional image displayed on a display surface of an electronic display device.

### Claim 6 (depends on 1)

The display device according to claim 1, wherein at least one of the image projected by the projector optical system and the observed object is an image time-dependently or kinetically changed.