Projection lens for a projector

Details Projection lens for a projector Projection lens for a projector

1987-09-02

1989-06-13

Arnold, Bruce Y.

350412, 350465, G02B 1318, G02B 960

Patent

active

048386707

ABSTRACT:
A five unit projection lens for a projector composed of, in order from the screen side, a first positive lens unit having at least one aspherical surface, a second negative lens unit comprising a double concave lens, a third positive lens unit, a fourth lens unit, and a fifth negative lens unit with a concave surface having a great curvature directed toward the screen.

REFERENCES:
patent: 4682862 (1987-07-01), Moskovich
patent: 4691996 (1987-09-01), Cho
patent: 4733953 (1988-03-01), Yamamoto et al.
patent: 4761063 (1988-08-01), Yoshioka et al.

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