Projection system and projector

Number of patents in Portfolio can not be more than 2000

United States of America

PATENT NO 12235465
APP PUB NO 20230049785A1
SERIAL NO

17876806

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ATTORNEY / AGENT: (SPONSORED)

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Abstract

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A projection system includes a first optical system and a second optical system disposed on an enlargement side of the first optical system. The first optical system includes a first lens group having positive power, a second lens group disposed on the enlargement side of the first lens group and having negative power, and an optical path deflector disposed between the first lens group and the second lens group. The second optical system includes a reflection member having a concave reflection surface. The second lens group includes three aspherical lenses. Conditional Expression (1) below is satisfied,

description='In-line Formulae' end='lead'0.25<|F|×FNO/Ymax<0.5  (1)description='In-line Formulae' end='tail'

where F represents the focal length of the entirety of the projection system, FNO represents the F number of the projection system, and Ymax represents a maximum image height in a reduction-side conjugate plane.

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Patent Owner(s)

  • SEIKO EPSON CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hirano, Hitoshi Suwa, JP 264 2221
Minefuji, Nobutaka Omachi, JP 61 1006
Shiokawa, Koji Suzaka, JP 15 51

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