Illumination apparatus and projection type display apparatus
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United States of America Patent
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-
Oct 8, 2002
Grant Date -
Feb 28, 2002
app pub date -
Apr 23, 2001
filing date -
Apr 25, 2000
priority date (Note) -
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status (Latency Note)
Importance
Abstract
An illumination apparatus and a projection type display apparatus of lower cost are provided, in which extra-axial aberrations, especially distortion and lateral aberration, are favorably corrected, and the dimensional margin of illumination is suppressed to enhance the utilization factor of light. The illumination apparatus includes a first group of lenses which includes a meniscus lens having a positive refracting power, a second group of lenses which includes first lens means having a negative refracting power and second lens means having a positive refracting power, and lens means whose surface immediately before a surface to-be-illuminated is a plane surface, whereby an illuminating light beam is caused to exit in a telecentric state.
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