Projection lens apparatus

Details Projection lens apparatus Projection lens apparatus

1983-01-19

1985-10-22

Corbin, John K.

350477, G02B 304, G02B 912

Patent

active

045484805

ABSTRACT:
A projection lens apparatus for projecting an image from a CRT onto a remote screen. The lens apparatus is basically a Petzval type for a large aperture ratio and comprises three lenses. The first lens is a plastic lens having at least one aspherical surface and the third lens has a bi-aspherical surface. To reduce the thermal drift of the focal position, the second lens is a glass lens, having relatively largely positive optical power.

REFERENCES:
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky

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