Optical: systems and elements – Projection screen – Curved
Patent
1992-02-20
1993-04-06
Wintercorn, Richard A.
Optical: systems and elements
Projection screen
Curved
359460, G03B 2156
Patent
active
052008541
ABSTRACT:
The object of the invention is to provide a large-screen projection-type display using a transmission-type screen, wherein the transmission-type screen is formed of two or more sheets 4, 7, is tilted toward the viewer's side with a small gap kept between the sheets, and is stable relative to the temperature and moisture change of the environment. The front sheet 4 provided on the viewer's side and the Fresnel sheet 7 provided on the projection source side are tilted forward by about 7.degree. toward the viewers. The springs 10 are extended through wires 9 to exert the tension on the front sheet 4 in the vertical direction. At the same time, the springs exert a pressure on the Fresnel sheet 7 in the vertical direction.
REFERENCES:
patent: 3037424 (1962-06-01), Capetta
patent: 4406519 (1983-09-01), Shaw
patent: 4536056 (1985-08-01), Oguino
patent: 4574506 (1986-03-01), Morgan
patent: 5011277 (1991-04-01), Ogino et al.
patent: 5127722 (1992-07-01), Nishitani
Iwahara Yoshiaki
Kobayashi Yukihiro
Ogino Masanori
Sakamoto Shuichi
Hitachi , Ltd.
Hitachi Video & Information System, Inc.
Wintercorn Richard A.
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