Optics: image projectors – Plural projection paths with single light source
Patent
1989-05-31
1990-07-17
Wintercorn, Richard A.
Optics: image projectors
Plural projection paths with single light source
353 78, G03B 2160
Patent
active
049417320
ABSTRACT:
A back-surface projection screen for observing a light image, projected from the rear surface of a screen, on a major surface of the screen comprises a lenticular lens constructed of a greater number of lens units in a continuous array with a top surface section defined as a lens section and with a pair of total-reflection surfaces formed as side convex lenses relative to a central convex lens section formed at the lens section. A pair of linear surfaces are formed one at each of the total-reflection surfaces in an opposed relation with the central lens section located therebetween. The total-reflection surfaces are so curved as to allow light which is incident on the screen from behind to be condensed by reflection toward the linear surfaces. The lens section of each lens unit in the lenticular lens is recessed at the central section to define that center convex lens surface there with the pair of side total-reflection surfaces formed as a pair of convex lens. A pair of stepped sections are formed one at a boundary between the central lens section and the side lens section to define the pair of linear surfaces. The total-reflection surfaces are so curved as to allow light which is incident on the screen from behind to be condensed by reflection toward the linear surfaces.
REFERENCES:
patent: 3895866 (1975-07-01), de Quervain
patent: 3944331 (1976-03-01), Janning
patent: 4222641 (1980-09-01), Stolov
patent: 4468092 (1984-08-01), Inoue et al.
patent: 4722593 (1988-02-01), Shimazaki
patent: 4770525 (1988-09-01), Umeda et al.
patent: 4787737 (1988-11-01), Ogawa et al.
patent: 4824210 (1989-04-01), Shimazaki
Nakakusu Tohru
Sato Makoto
Shimazaki Tatsuo
Umeda Osamu
Casio Computer Co. Ltd.
Wintercorn Richard A.
LandOfFree
Transmission type projection screen does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmission type projection screen, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmission type projection screen will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-92326