Optical: systems and elements – Single channel simultaneously to or from plural channels – By partial reflection at beam splitting or combining surface
Patent
1994-11-15
1996-07-23
Epps, Georgia Y.
Optical: systems and elements
Single channel simultaneously to or from plural channels
By partial reflection at beam splitting or combining surface
353 30, 353 34, G02B 2714, G03B 2126
Patent
active
055395791
ABSTRACT:
An optical system of a projection display apparatus includes a projection lens assembly having a first lens group having a negative power, a second lens group having a negative power and a third lens group having a positive power, all arranged in this order from a side of a screen. An air space is provided between the first and second lens groups and also between the second and third lens groups. Each air space is longer than the entire length of the second lens group as taken along the optical axis of the assembly. The projection display apparatus has a light source for radiating rays of light including three primary color components, a color separating optical system for separating the radiation into three primary color components, first to third light valves each operable to receive the respective primary color components from the color separating optical system and to form an optical image having an optical characteristic varying as a function of a video signal, a color combining optical system for combining images of light emerging, respectively, from the light valves to provide a composite image. The projection lens assembly receives the image from the combining unit so as to project the optical images, formed on the respective light valves, onto a screen.
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Fushimi Yoshimasa
Kimura Yuichi
Miyatake Yoshito
Sannohe Sinya
Epps Georgia Y.
Matsushita Electric - Industrial Co., Ltd.
Moch Ricky
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