Mini-zoom projection lenses for use with pixelized panels
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United States of America Patent
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-
May 4, 1999
Grant Date -
N/A
app pub date -
Aug 11, 1997
filing date -
Aug 16, 1996
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Projection lenses for use with pixelized panels, e.g., LCD panels, are provided. The lenses have a large focus range, e.g., a focus range of greater than 0.05 and in many cases greater than 0.1, and a limited (mini) zoom range, e.g., a zoom range of less than 15% (.+-.7.5% from the center of the range). By limiting the zoom range, complex lens structures involving large numbers of lens elements are avoided. In particular, the lenses employ at most one additional lens element and in many cases no additional lens elements compared to non-zooming lenses having a similar focus range.
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Cited Art Landscape
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