Projection lens system for use in projection television

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

1990-04-24

1991-02-19

Sugarman, Scott J.

350412, G02B 1318

Patent

active

049938169

ABSTRACT:
A six-element projection lens system for use in a projection television is disclosed which comprises, in order from the screen side, a positive first lens, a positive meniscus second lens, a negative third lens having a stronger concave surface directed toward the CRT side than on the other side, a biconvex positive fourth lens, a positive meniscus fifth lens, and a negative sixth lens having a concave surface directed toward the screen side, with each of the second and sixth lenses being a plastic lens having at least one aspheric surface.

REFERENCES:
patent: 4767199 (1988-01-01), Yamamoto et al.
patent: 4776682 (1988-10-01), Hosoya
patent: 4792218 (1988-12-01), Nakajima et al.

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