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US 2023/0139677 A1Published application
Zoom lens and image capture apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorsHiroki Ebe, Shunji Iwamoto
Life of this patent
Estimating the term…
Abstract
A zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and two or more additional lens units. In zooming, the first lens unit moves, and an interval between adjacent lens units changes. The refractive index of a negative lens A disposed on a most object side of negative lenses included in the first lens unit is higher than or equal to 1.89, and the negative lens A and a lens B disposed adjacent to an image side of the negative lens A satisfy a predetermined relationship.
Claims15
A zoom lens comprising:
- a first lens unit having a negative refractive power;
- a second lens unit having a positive refractive power;
- and
- two or more additional lens units, wherein
- the first lens unit, the second lens unit, and the two or more additional lens units are disposed in order from an object side toward an image side,
- in zooming, the first lens unit is arranged to move, and an interval between adjacent lens units changes,
- the refractive index of a negative lens A disposed on a most object side of negative lenses included in the first lens unit is higher than or equal to 1.89, and
- where the radius of curvature of an image-side lens surface of the negative lens A is Ra, the radius of curvature of an object-side lens surface of a lens B disposed adjacent to the image side of the negative lens A is Rb, an air gap between the negative lens A and the lens B is Da, and an air gap between the lens B and a lens disposed adjacent to an image side of the lens B is Db, inequalities
- 2.0<Ra/Da<100, and
- 10<Rb/Db<100
- are satisfied.
8 more elements
Dependencies are inferred from the claim text.