Projection optical system and projector apparatus

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United States of America Patent

PATENT NO 10761415
APP PUB NO 20170363944A1
SERIAL NO

15695535

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Abstract

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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).

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Patent Owner(s)

Patent OwnerAddress
NITTOH INCSUWA-SHI NAGANO 392-0131

International Classification(s)

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  • 2017 Application Filing Year
  • G02B Class
  • 11360 Applications Filed
  • 8685 Patents Issued To-Date
  • 76.46 % Issued To-Date
Click to zoom InYear of Issuance% of Matters IssuedCumulative IssuancesYearly Issuances2017201820192020202120222023202420250255075100

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Matsuo, Takahiko Nagano, JP 16 79

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  • 1 Citation Count
  • G02B Class
  • 43.63 % this patent is cited more than
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Citation count rangeNumber of patents cited in rangeNumber of patents cited in various citation count ranges27143263150433256421101 - 1011 - 2021 - 3031 - 4041 - 5051 - 6061 - 7071 - 8081 - 90100 +020040060080010001200140016001800200022002400260028003000320034003600

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