Image projection system with autofocusing
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United States of America Patent
Stats
-
Mar 21, 1995
Grant Date -
N/A
app pub date -
Dec 21, 1993
filing date -
Dec 28, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An image projection device comprising at least one display panel (26, 27, 28), a projection lens system (C) and a focus error detection system (FS) is described. Since the radiation source (50) and the radiation-sensitive detector (51) of the focus error detection system are arranged in planes which effectively coincide with the plane of the display panel (28), and a focus measuring beam b traverses the projection lens system twice on its path to and from a projection screen (D), an accurate and reliable focus error signal (S.sub.f) is obtained.
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Cited Art Landscape
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