Focus corrector for zoom projection lenses used with pixelized panels
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United States of America Patent
Stats
-
Jan 2, 2001
Issued Date -
N/A
app pub date -
Aug 26, 1999
filing date -
May 4, 1999
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A zoom projection lens for use with pixelized panels is provided. The projection lens has a negative/positive (retrofocus) form, with the positive lens unit (U2) having two positive subunits (U2.sub.S1, U2.sub.S2). The image (screen) side subunit (U2.sub.S1) serves as focus corrector for the lens, i.e., after zooming, this subunit is moved to adjust the focus of the lens. Compared to moving the negative unit (U1), this approach achieves better aberration correction and involves moving less mass through smaller distances.
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Cited Art Landscape
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