Image display device and adjustment for alignment

• US 20070201009A1
• Filed: 05/01/2007
• Published: 08/30/2007
• Est. Priority Date: 05/10/2000
• Status: Active Grant

• Current Assignee: Hiroshi Suzuki, Jiro Suzuki, Kohei Teramoto, Shinsuke Shikama
• Original Assignee: Hiroshi Suzuki, Jiro Suzuki, Kohei Teramoto, Shinsuke Shikama
• Inventors: Suzuki, Hiroshi, Teramoto, Kohei, Suzuki, Jiro, Shikama, Shinsuke
• Granted Patent: US 7,572,014 B2
• Time in Patent Office: Days
• US Class Current: 353/78
• CPC Class Codes: G02B 13/16 for use in conjunction with image converters or intensifiers , or for use with projectors, e.g. objectives for projection TV
• CPC Class Codes: G02B 13/18 with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration G02B13/002 takes precedence
• CPC Class Codes: G02B 17/002 Arrays of reflective systems
• CPC Class Codes: G02B 17/08 Catadioptric systems used in non-imaging applications G02B19/00
• CPC Class Codes: G02B 17/0852 having a field corrector only
• CPC Class Codes: G02B 17/086 wherein the system is made of a single block of optical material, e.g. solid catadioptric systems
• CPC Class Codes: G02B 27/0025 for optical correction, e.g. distorsion, aberration
• CPC Class Codes: G02B 27/18 for optical projection, e.g. combination of mirror and condenser and objective photographic, cine and overhead projectors G03B21/00; photographic projection printing G03B27/32; photolithographic projectors G03F7/20; projection television H04N5/74; colour projection television H04N9/31
• CPC Class Codes: G02B 5/09 Multifaceted or polygonal mirrors , e.g. polygonal scanning mirrors; Fresnel mirrors
• CPC Class Codes: G02B 7/181 with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
• CPC Class Codes: G02B 7/28 Systems for automatic generation of focusing signals
• CPC Class Codes: G03B 21/10 Projectors with built-in or built-on screen
• CPC Class Codes: G03B 21/16 Cooling; Preventing overheating
• CPC Class Codes: G03B 21/28 Reflectors in projection beam in illumination beam G03B21/2066
• CPC Class Codes: G03B 21/53 Means for automatic focusing, e.g. to compensate thermal effects
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor
• CPC Class Codes: H04N 5/7458 the modulator being an array of deformable mirrors, e.g. digital micromirror device [DMD]
• CPC Class Codes: H04N 9/12 Picture reproducers H04N9/11 takes precedence
• CPC Class Codes: H04N 9/3141 Constructional details thereof details not peculiar to the presence of an electronic spatial light modulator G03B21/14
• CPC Class Codes: H04N 9/3147 Multi-projection systems displays in general H04N9/12; video walls G06F3/1446, G09G2300/026
• CPC Class Codes: H04N 9/317 : Convergence or focusing systems electronic adjustment of convergence H04N9/3185; convergence or focusing arrangements for cathode ray tubes H04N9/28; means for automatic focusing of projectors not peculiar to the presence of an electronic spatial light modulator G03B21/53
• CPC Class Codes: H04N 9/3194 : including sensor feedback

Abstract

An image display device comprises an optical imaging arrangement for providing image information to illumination light and for transmitting the light as an optical image signal; a display for receiving the optical image signal and for displaying an image based on the image information; and a projecting optical arrangement including a reflecting part having a reflecting surface for reflecting the optical image signal, and a refracting optical part having a refracting surface for projecting the optical image signal onto the reflecting part. At least one of the reflecting surface and the refracting surface is aspherical.

Claims

1. An image display device comprising:

transmitting means for providing image information to illumination light and for transmitting said light as an optical image signal;

projecting optical. means for projecting said optical image signal; and

display means for receiving said optical image signal through said projecting optical means and for displaying an image based on said image information,

wherein said display means and said projecting optical means shares an optical axis with each other, and said optical axis is disposed at a position diverged from said display means.

2. The image display device according to claim 1, wherein said transmitting means is composed of a light emitter for emitting light;

a spatial optical modulating element for modulating incident illumination light corresponding to said image information to be outputted, and a converging means for guiding the light emitted from said emitter to said spatial optical modulating element to be incident thereon as illumination light, and wherein said projecting optical means is composed of a reflecting part for reflecting said optical image signal, and a refracting optical part for correcting the aberration of said reflecting part and for projecting said optical image signal to said reflecting part.

3. The image display device according to claim 2, wherein at least a part of said transmitting means is disposed in a space on the side of a receiving surface of said display means and on the side of one of said optical axes, said space not intercepting the optical image signal reflected at said reflecting part.

4. The image display device according to claim 2, further comprising a plane mirror for reflecting for reflecting the optical image signal output from said projecting optical means to said display means,

wherein said image display device has a relationship that a receiving surface of said display means is parallel to a reflecting surface of said plane mirror, and has a bottom orthogonal to a reflecting surface of said plane mirror and a receiving surface of said display means, and

wherein a converging optical system principle part composed of a part of the emitter and converging means is disposed in a placement space in the form of a pentahedron defined as vertexes:

a first point present on the base of a quadrangular image displayed on said display means and furthest from the center of the image;

a second point on said plane mirror on which light toward the first point is reflected;

a third point on said reflecting part on which light toward said second point is reflected;

a fourth point, a fifth point, and a sixth point that are respectively formed by projecting said first point, said second point and said third point onto said bottom from the direction normal to said bottom.

5. The image display device according to claim 2, wherein said projecting optical part has a first path-bending means for reflecting the optical image signal from said refracting optical means to said reflecting part.

6. The image display device according to claim 5, wherein said first path bending means is a reflecting mirror or prism element.

7. The image display device according to claim 2, wherein said refracting optical means has a second path-bending means for reflecting the optical image signal from first lens refracting means to second lens means.

8. The image display device according to claim 7, wherein said second path-bending means is a reflecting mirror or prism element.

9. The image display device according to claim 2, wherein said reflecting part has a shape such that a nonreflecting portion not reflecting the optical image signal to said display means is cut out.

10. The image display device according to claim 4, wherein the optical axis of said converging optical system principle part is disposed parallel to the receiving surface of said display means and said bottom.

11. The image display device according to claim 4, wherein the optical axis of said converging optical system principle part is disposed parallel to the receiving surface of said display means, and is inclined to said bottom at a predetermined angle.

12. The image display device according to claim 4, further comprising a second prism element serving as a medium of a bundle of rays outgoing from said converging optical system principle part to be incident on said spatial optical modulating element, and a bundle of rays outgoing from said spatial optical modulating element to be incident on said refracting optical part.