Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
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United States of America Patent
Stats
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Nov 17, 2020
Grant Date -
N/A
app pub date -
Mar 17, 2017
filing date -
Feb 6, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.
First Claim
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International Classification(s)
- 2017 Application Filing Year
- G02B Class
- 11360 Applications Filed
- 8685 Patents Issued To-Date
- 76.46 % Issued To-Date
Cited Art Landscape
Patent Citation Ranking
- 0 Citation Count
- G02B Class
- 0 % this patent is cited more than
- 5 Age
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