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US 2001/0017732 A1Published application
Optical system and optical apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorTakeshi Akiyama
Life of this patent
Estimating the term…
Abstract
An optical system comprises, in succession from the object side, a first optical element of negative optical power, a second optical element of positive optical power, and a third optical element of negative optical power, at least one of the first to third optical elements being a refracting optical element having a reflecting curved surface.
Claims15
An optical system comprising, in succession from the object side:
- a first optical element of negative optical power;
- a second optical element of positive optical power;
- and
- a third optical element of negative optical power;
- at least one of said first to third optical elements being a reflecting optical element having a reflecting curved surface.
2 more elements
An optical system comprising, in succession from the object side:
- a first optical unit of negative optical power;
- a second optical unit of positive optical power;
- and
- a third optical unit of negative optical power;
- wherein the positions of at least two of said first to third optical units relative to the imaging plane are changed to thereby effect zooming, and
- at least one of said first to third optical units has a reflecting optical element having a reflecting curved surface.
3 more elements
Dependencies are inferred from the claim text.