Optical projector

Details Optical projector Optical projector

1997-01-14

1998-05-12

Dowling, William

Optics: image projectors

Prism in light path

359831, G03B 2114

Patent

active

057496412

ABSTRACT:
An optical projector is described that orients its optics engine preferably vertically within an enclosure that is higher than it is wide or deep. The invented optics engine uses a prismatic cube for color separation or beam splitting, with the prismatic elements within the cube being secured within a durable frame that mounts the three color light valves, e.g. twisted nematic liquid crystal display (LCD)-type shutters, in a predefined position and orientation relative to the prismatic cube. In order to improve image quality and brightness, especially of the notoriously difficult-to-reproduce green color, red and blue beams are S polarized, as is conventional, but the green beam is P-polarized. The invented optical projector preferably includes a frame having a footing portion for resting on a support surface, a light source high above the footing portion, optical convolution structure downstream from the light source for reverse-bending downwardly flowing light from the source, light modulation structure near the reverse bend region for infusing the light with image information and for directing modulated light upwardly in a projectable, image-containing stream of light and outward-projection directing structure high on the frame for receiving and outwardly directing such stream of light.

REFERENCES:
patent: 4784469 (1988-11-01), Tsukada et al.
patent: 4786146 (1988-11-01), Ledebuhr
patent: 4850685 (1989-07-01), Kamakura et al.
patent: 4981352 (1991-01-01), Tejima et al.
patent: 5067799 (1991-11-01), Gold et al.
patent: 5097323 (1992-03-01), Sato et al.
patent: 5214457 (1993-05-01), Takanashi et al.
patent: 5221998 (1993-06-01), Sugahara
patent: 5231431 (1993-07-01), Yano et al.
patent: 5241407 (1993-08-01), Sonehara et al.
patent: 5270804 (1993-12-01), Lach
patent: 5276523 (1994-01-01), Kurematsu et al.
patent: 5283602 (1994-02-01), Kwon
patent: 5404234 (1995-04-01), Taniguchi et al.
patent: 5418583 (1995-05-01), Masumoto
patent: 5467154 (1995-11-01), Gale et al.
patent: 5570231 (1996-10-01), Mogamiya
patent: 5653522 (1997-08-01), Loucks

Affiliated with

Also associated with

Rating

Optical projector does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical projector, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical projector will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-974271