Lens apparatus and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorKei Sugiyama
Life of this patent
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Abstract
A lens apparatus includes two optical systems. Each of the two optical systems includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a first reflective surface, a second reflective surface, and a rear lens unit having positive refractive power. At least a distance between the first lens unit and the second lens unit and a distance between the second lens unit and the first reflective surface are changed during magnification variation. A predetermined condition is satisfied.
Claims23
A lens apparatus comprising two optical systems,
- wherein each of the two optical systems includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a first reflective surface, a second reflective surface, and a rear lens unit having positive refractive power,
- wherein at least a distance between the first lens unit and the second lens unit and a distance between the second lens unit and the first reflective surface are changed during magnification variation, and
- wherein the following inequality is satisfied:
- 0.05<Dout/Din<0.50
- 0.50<f1/fw<3.57
- where Din is a distance between surface vertices of lenses disposed closest to the object side in each of the two optical systems, Dout is a distance between surface vertices of lenses disposed closest to the image side in each of the two optical systems, f1 is a focal length of the first lens unit, and fw is a focal length at a wide-angle end of the optical system.
An image pickup apparatus comprising:
- a lens apparatus;
- and
- an image sensor configured to capture an optical image formed by the lens apparatus;
- wherein the lens apparatus includes two optical systems,
- wherein each of the two optical systems includes, in order from an object side to an image side, a first lens unit having positive refractive power, a second lens unit having negative refractive power, a first reflective surface, a second reflective surface, and a rear lens unit having positive refractive power,
- wherein at least a distance between the first lens unit and the second lens unit and a distance between the second lens unit and the first reflective surface are changed during magnification variation, and
- wherein the following inequality is satisfied:
- 0.05<Dout/Din<0.50
- 0.50<f1/fw<3.57
- where Din is a distance between surface vertices of lenses disposed closest to the object side in each of the two optical systems, and Dout is a distance between surface vertices of lenses disposed closest to the image side in each of the two optical systems, f1 is a focal length of the first lens unit, and fw is a focal length at a wide-angle end of the optical system.
Dependencies are inferred from the claim text.