Optical system and optical apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorsToshihiro Sunaga, Takeshi Akiyama
Life of this patent
Estimating the term…
Abstract
The optical system provided with a first optical part disposed most adjacent to the object side, the optical part having three or more optical surfaces, of which at least one is a reflecting surface, and an aperture stop disposed more adjacent to the image side than the first optical part, wherein when the spacing from the first optical surface to the third optical surface as counted from the object side of the first optical part is defined as D and the spacing from the first optical surface to the entrance pupil at an azimuth ξ degrees is defined as X(ξ), the following condition is satisfied: (X(0)+X(90))/2<D. The specification also discloses an optical apparatus provided with such optical system.
Claims11
An optical system comprising:
- a first optical part disposed most adjacent to an object side, said first optical part having three or more optical surfaces, of which at least one is a reflecting surface;
- and
- an aperture stop disposed more adjacent to an image side than said first optical part;
- wherein when the spacing from a first optical surface to a third optical surface as counted from the object side of said first optical part is defined as D and the spacing from said first optical surface to an entrance pupil at an azimuth ξ degrees is defined as X(ξ), the following condition is satisfied:
- |(X(0)+X(90))/2|<D.
Dependencies are inferred from the claim text.