Projection lens systems for use in projection television

Details Projection lens systems for use in projection television Projection lens systems for use in projection television

1989-01-03

1991-02-05

Dzierzynski, Paul M.

350432, 350412, G02B 962

Patent

active

049899619

ABSTRACT:
A projection lens system including seven lens elements for use in a projection television which comprises, in order from the screen side, a first lens unit composed of a positive lens element, a second lens unit composed of an aspherical lens element made of plastic in a meniscus form having at least one aspherical surface, a third lens unit composed of a concave lens element, a fourth lens unit composed of a positive cemented lens having a convex surface on both sides, a fifth lens unit composed of a positive lens element made of plastic in meniscus form having at least one aspherical surface, and a sixth lens unit composed of a negative lens element which has a concave surface directed toward the screen, the sixth lens unit being made of a plastic lens in meniscus form having at least one aspherical surface.

REFERENCES:
patent: 4682862 (1987-07-01), Moskovich
patent: 4778264 (1988-10-01), Matsumura et al.

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