Retrofocus lens for overhead projector
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United States of America Patent
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-
Sep 19, 1989
Grant Date -
N/A
app pub date -
Dec 26, 1987
filing date -
Dec 26, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A four-element inverted telephoto projection lens assembly for use in conventional overhead projectors is disclosed. The lens assembly features a reduced projection distance from the lens assembly to the projection screen while retaining the same back focus as conventional two-element projection lenses for overhead projectors.
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Cited Art Landscape
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