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US 2026/0299266 A1Published application
Optical system and image pickup apparatus
AssigneeCanon Kabushiki Kaisha
InventorsHayato KATO, Toyokatsu FUJISAKI
Life of this patent
Estimating the term…
Abstract
An optical system may include, in order from an object side to an image side, a first lens unit, an aperture stop, and a second lens unit. The first lens unit may include a lens A, which is closest to the object side and has a negative refractive power. The second lens unit may include a lens B having negative refractive power.
Claims11
An optical system comprising, in order from an object side to an image side:
- a first lens unit;
- an aperture stop;
- and
- a second lens unit,
- wherein the first lens unit includes a lens A, which is closest to the object side and has a negative refractive power,
- wherein the second lens unit includes a lens B having negative refractive power, and
- wherein the following inequalities are satisfied:
- 1.7
- ≤
- Ndn
-
- 2
- ≤
- 2
- .00
- 8.
- ≤
- vdn
-
- 2
- ≤
- 22.
- ,
- and
- 0.8
- ≤
- SL
- /
- f
- ≤
- 3.
- where Ndn2 is a refractive index of the lens B at d-line, vdn2 is an Abbe number of the lens B based on the d-line, f is a focal length of the optical system, and SL is an air-equivalent distance on an optical axis from the aperture stop to an image plane.
29 more elements
An image pickup apparatus comprising:
- an optical system;
- and
- an image sensor configured to capture an object image via the optical system,
- wherein the optical system includes, in order from an object side to an image side:
- a first lens unit;
- an aperture stop;
- and
- a second lens unit,
- wherein the first lens unit includes a lens A, which is closest to the object side and has a negative refractive power,
- wherein the second lens unit includes a lens B having negative refractive power, and
- wherein the following inequalities are satisfied:
- 1.7
- ≤
- Ndn
-
- 2
- ≤
- 2
- .00
- 8.
- ≤
- vdn
-
- 2
- ≤
- 22.
- ,
- and
- 0.8
- ≤
- SL
- /
- f
- ≤
- 3.
- where Ndn2 is a refractive index of the lens B at d-line, vdn2 is an Abbe number of the lens B based on the d-line, f is a focal length of the optical system, and SL is an air-equivalent distance on an optical axis from the aperture stop to an image plane.
33 more elements
Dependencies are inferred from the claim text.