Video projector lens system

Details Video projector lens system Video projector lens system

1986-04-18

1988-07-19

Corbin, John K.

350412, G02B 1318, G02B 934

Patent

active

047580747

ABSTRACT:
A video projector lens system is provided, which comprises, from the screen side to the tube side, a first positive lens having a screen side convex surface, a second negative meniscus lens having a screen side convex surface, a third biconvex lens, and a fourth negative lens having a screen side concave surface. The first and second lenses are made of a plastic material for cancelling the temperature depending characteristic of one of the first and second lenses with the counterbalanced refractive power of the other thereof, wherein at least one aspheric surface is applied to the lens system. The third lens bearing a considerable part of the positive refractive power distributed in the whole lens system is made of a glass material for avoiding further temperature dependency.

REFERENCES:
patent: 3429997 (1969-02-01), Rosner et al.
patent: 3516734 (1970-06-01), Schmidt
patent: 3800085 (1974-03-01), Ambats et al.
patent: 3868173 (1975-02-01), Miles et al.
patent: 3912379 (1975-10-01), De Jager
patent: 3961844 (1976-06-01), Betensky
patent: 4348081 (1982-09-01), Betensky

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