Variable magnification optical system for projection and projection-type display apparatus

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United States of America Patent

PATENT NO 8693105
APP PUB NO 20110249344A1
SERIAL NO

13084972

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Abstract

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A variable magnification optical system for projection includes a first-lens-group having negative refractive power, and which is fixed when magnification of the system is changed, a second-lens-group having negative refractive power, and which is movable when magnification of the system is changed, a third-lens-group having positive refractive power, and which is movable when magnification of the system is changed, and a fourth-lens-group having positive refractive power, and which is fixed when magnification of the system is changed, which are arranged from the magnification side of the system in the order mentioned. The reduction side of the variable magnification optical system is telecentric, and formula 1.5

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Patent Owner(s)

  • FUJIFILM CORPORATION

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Nagahara, Akiko Saitama, JP 56 365
Nagatoshi, Yukiko Saitama, JP 64 210

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