Color corrected projection lens

Details Color corrected projection lens Color corrected projection lens

1986-02-03

1988-03-29

Corbin, John K.

G02B 1318, G02B 934

Patent

active

047339535

ABSTRACT:
A color corrected projection lens with a large aperture ratio and a wide angle of view for producing on a screen an enlargement of an image appearing on a CRT, the lens having sequentially from the screen end a first unit of a bi-convex element having a positive power with a strongly convex surface directed toward the screen end, a second unit of a bi-concave element having a negative power and being located at or in the vicinity of the entrance pupil position of the entire lens system, a third unit of a bi-convex element having a positive power, and a fourth unit having a negative power with a strongly concave surface directed toward the screen end.

REFERENCES:
patent: 3912379 (1975-10-01), De Jager
patent: 4606607 (1986-08-01), Kurihara

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