Projection lens system for projectors

Details Projection lens system for projectors Projection lens system for projectors

1989-12-20

1990-12-11

Dzierzynski, Paul M.

350412, B29D 1100

Patent

active

049765256

ABSTRACT:
Described herein is a projection lens system, comprising from the screen side a positive first lens unit of weak power consisting of a plastic meniscus, a positive or negative second lens unit of weak power consisting of a plastic lens element, third and fourth lens units in the form of a cemented glass lens having a positive combined focal length, a positive fifth lens unit of strong power, a positive sixth lens unit of weak power consisting of a plastic lens element, and a negative seventh lens unit having a concave surface on the screen side, each of the first, second, sixth and seventh lens units having at least an aspheric surface, and arranged to satisfy the following conditions

REFERENCES:
patent: 4761063 (1988-08-01), Yoshioka et al.
patent: 4778264 (1988-10-01), Matsumura et al.
patent: 4900139 (1990-02-01), Kreitzer

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