Long focal length projection lenses for use with large pixelized panels
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United States of America Patent
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Nov 23, 1999
Grant Date -
N/A
app pub date -
Jan 28, 1998
filing date -
Jan 31, 1997
priority date (Note) -
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status (Latency Note)
Importance
Abstract
Projection lens having long focal lengths for use with LCD panels are provided. The lenses have a first lens unit which has a positive power and a second lens unit which has a negative power. The first lens unit contains at least three lens elements organized into two subunits, namely, a positive first lens subunit having a positive lens element and a negative lens element and a positive second lens subunit having a positive lens element. The second lens unit contains at least two lens elements, namely, a positive lens element and a negative lens element. The projection lens preferably employs only five lens elements arranged in a positive, negative, positive, positive, negative configuration.
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