Projection apparatus using telecentric optics
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United States of America Patent
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Jul 6, 2004
Grant Date -
N/A
app pub date -
Mar 20, 2003
filing date -
Mar 20, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A digital projection apparatus (10) for projection of a multicolor image uniformizes polychromatic light from a light source (20) and provides magnification to the uniformized illumination beam using a base condenser relay (80), providing a reduced numerical aperture for conditioning at a dichroic separator (27). For each monochromatic component color provided from the dichroic separator (27), a reducing relay (82) then demagnifies the illumination beam to provide source illumination to a spatial light modulator (30) at an increased numerical aperture. The modulated beam from the spatial light modulator (30) is then magnified by a magnifying relay lens assembly (28) and directed, at a lower numerical aperture, to a dichroic combiner (26) and to a projection lens (32). As a result, the projection lens (32) has reduced working distance, color shading across the field is minimized, and brightness is optimized.
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Cited Art Landscape
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