Video projector lens system

Details Video projector lens system Video projector lens system

1986-12-04

1989-10-24

Sugarman, Scott J.

350412, G02B 1318

Patent

active

048757632

ABSTRACT:
The present invention provides a video projector lens system for projecting onto a screen a video image formed on a face plate of a cathode ray tube, with having high optical performance, large aperture, or matching for applying optical coupling technique. The lens system 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 bi-convex lens made of a glass material; and a fourth negative lens having a screen side concave surface. The lens system includes at least one aspheric surface and fulfills the following condition;

REFERENCES:
patent: 4530575 (1985-07-01), Yamakawa
patent: 4577935 (1986-03-01), Yamakawa et al.
patent: 4595263 (1986-06-01), Clarke
patent: 4758074 (1988-07-01), Yamakawa

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