Image display device and adjustment for alignment

• US 20050083491A1
• Filed: 10/21/2004
• Published: 04/21/2005
• Est. Priority Date: 05/10/2000
• Status: Active Grant

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Suzuki, Hiroshi, Teramoto, Kohei, Suzuki, Jiro, Shikama, Shinsuke
• Granted Patent: US 6,994,437 B2
• Time in Patent Office: Days
• US Class Current: 353/70
• 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

A refracting optical lens 15 is provided to project light from transmitting means onto a convex mirror 16 to correct for pincushion distortion of the convex mirror 16.

Claims

1. An image display device comprising:

an optical imaging arrangement for providing image information to illumination light and for transmitting the image information as an optical image signal;

a projecting optical arrangement for receiving the optical image signal and for projecting the optical image signal;

a display for receiving the optical image signal through said projecting optical arrangement and for displaying an image based on the image information; and

a plane mirror for reflecting the optical image signal output from said projecting optical arrangement on said display,

wherein said image display device has a bottom intercepting a receiving surface of said display; and

wherein at least a part of said optical imaging arrangement is disposed in a placement space defined by linking with a line, respectively;

a first point present on the basis of an image displayed on said display and furthest from the center of the image with a first projected point formed by projecting the first point to said bottom from the direction normal to the bottom;

a second point on said plane mirror on which light toward the first point is reflected with a second projected point formed by projecting the first point to said bottom from the direction normal to said bottom; and

a third point on said plane mirror on which light toward the second point is reflected with a third projected point formed by projecting the third point to said bottom from the direction normal to said bottom.

2. The image display device according to claim 1, further comprising:

a refracting optical part for projecting the optical image signal transmitted from said optical imaging arrangement, and a reflecting part for reflecting the optical image signal projected by said refracting optical part.

3. The image display device according to claim 2, wherein said refracting optical part and a reflecting surface of said plane mirror are held in parallel to each other.

4. The image display device according to claim 3, wherein said optical imaging arrangement comprises:

a converging optical system principle part composed of an illumination light source part for emitting illumination light;

a color wheel for coloring an emitted light from said illumination light source part one after another;

a rod integrator for equalizing illumination distribution of an outgoing end face of the illumination light from said illumination light source part;

a relay lens for relaying the illumination light from said rod integrator;

a field lens for collimating principle light of the illumination light emitted from said relay lens; and

reflecting type image information providing part for providing the image information to the illumination light from said field lens and for reflecting it as an optical image signal, and wherein said converging optical system principle part is disposed in the placement space as a constituent element, and is further provided with an optical path-bending arrangement for reflecting consecutively the illumination light from said converging optical system principle part to said field lens.

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

6. The image display device according to claim 4, wherein an optical axis of said converging optical system principle part is parallel to said receiving surface of said display, and is tilted so that an intersecting point of said illumination light source part and the optical axis is higher than an intersecting point of said relay lens and the axis in the vertical direction.

7. The image display device according to claim 6, wherein said optical imaging arrangement further comprises an adjustment table for mounting the converging optical system principle part and said field lens, and said adjustment table has a receiving hole for receiving an optical path-bending element.

8. The image display device according to claim 4, wherein at least one optical surface of said optical path-bending arrangement is formed in the shape of a curved surface.