Optics: image projectors – Cabinet encloses projector and one side of screen
Patent
1994-12-20
1996-04-09
Dowling, William C.
Optics: image projectors
Cabinet encloses projector and one side of screen
353 77, 353 98, G03B 2128
Patent
active
055066429
ABSTRACT:
A projector comprising liquid crystal display panels and a projection lens for projecting the modulated light to a screen. A back surface reflection mirror including a transparent plastic sheet and a reflecting film is arranged between the projection lens and the screen. The mirror is thin and light and may have optical anisotropy. In order to eliminate an uneven pattern appearing in the screen caused by optical isotropy of the mirror and the difference between the light distribution characteristics in the screen for P- and S-polarized light, the projection lens and the back surface reflection mirror are arranged in such a relationship that a wave normal vector of an arbitrary component of the light projected by the projection lens and made incident to the back surface reflection mirror is not parallel to the optical axis of the plastic sheet.
REFERENCES:
patent: 5048949 (1991-09-01), Sato et al.
patent: 5278595 (1994-01-01), Nishida et al.
patent: 5379080 (1995-01-01), Onozuka
Goto Takeshi
Hamada Tetsuya
Kanno Takashi
Kobayashi Tetsuya
Nagakari Tsutomu
Dowling William C.
Fujitsu Limited
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