Projection optical system and projection type display apparatus using the same

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United States of America Patent

PATENT NO 10012815
SERIAL NO

15249137

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Abstract

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A projection optical system includes a first lens unit that moves in a direction of an optical axis in adjusting an amount of field curvature and a second lens unit located closer to a reduction side than the first lens unit. The first lens unit includes an aspherical lens satisfying predetermined conditional equations.

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Patent Owner(s)

  • CANON KABUSHIKI KAISHA

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Ichimura, Junya Utsunomiya, JP 21 84

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