Projection lens

Details Projection lens Projection lens

1987-12-30

1990-08-21

Sugarman, Scott J.

350412, G02B 1318

Patent

active

049500627

ABSTRACT:
A projection lens for projecting onto a screen an enlargement of an image appearing on a CRT wherein comma and chromatic aberration, which degrades imaging quality, can be properly corrected comprises 4 lens units. The projection lens comprises, in the order from the screen end, a first lens unit of positive optical power having a strong convex surface facing the screen end, a second lens unit comprising a biconvex lens element of positive optical power and a lens element of negative optical power having a concave surface facing the screen end, a third lens unit of positive optical power at an optical axis having a convex surface facing the screen end, and a fourth lens unit of negative optical power having a concave surface facing the screen end.

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: 4300817 (1981-11-01), Betensky
patent: 4348081 (1982-09-01), Betensky
patent: 4530575 (1985-07-01), Yamakawa
patent: 4778264 (1988-10-01), Matsumura et al.

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