Video projector lens system

Details Video projector lens system Video projector lens system

1982-02-08

1986-03-25

Corbin, John K.

350412, G02B 302, G02B 912

Patent

active

045779350

ABSTRACT:
Disclosed is a lens system for projecting onto a screen a video image formed on a face plate of a cathode ray tube and including, a first positive lens unit, a second positive lens unit defined between a pair of convex surfaces and a third negative lens unit having a screen side concave surface. The lens system includes at least one aspheric surface and fulfills the following condition: 1.5f<fl<2.0f, wherein f represents the focal length of the whole lens system and fl represents the focal length of the first positive lens unit.

REFERENCES:
patent: 3800085 (1974-03-01), Ambat et al.
patent: 4300817 (1981-11-01), Betensky
patent: 4348081 (1983-09-01), Betensky

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