Projection optical system and projector apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Sep 1, 2020
Grant Date -
Dec 21, 2017
app pub date -
Sep 5, 2017
filing date -
Dec 28, 2012
priority date (Note) -
In Force
status (Latency Note)
Importance
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US Family Size
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Non-US Coverage
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Abstract
A projection optical system (2) projects from a DMD (7) on a reducing side onto a screen (9) on an enlargement side, and includes: a first refractive optical system (10) that forms a first intermediate image (51) on the enlargement side using light incident from the reducing side; a second refractive optical system (20) that forms the first intermediate image (51) on the reducing side into a second intermediate image (52) on the enlargement side; and a first reflective optical system (30) including a first reflective surface (31a) with positive refractive power that is positioned on the enlargement side of the second intermediate image (52), wherein the second refractive optical system (20) includes a first focus lens group (61) that moves when focusing is carried out, and the first focus lens group (61) includes at least one lens (L13) included in the second refractive optical system (20).
First Claim
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Family
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
- 1 Citation Count
- G02B Class
- 43.63 % this patent is cited more than
- 5 Age
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Mar 1, 2028 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Mar 1, 2032 |
