Projection lens system for projectors
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United States of America Patent
Stats
-
Dec 11, 1990
Grant Date -
N/A
app pub date -
Dec 20, 1989
filing date -
Mar 30, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
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 0.08
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