Attachment optical system, image capturing optical system, and image capturing apparatus
AssigneeCanon Kabushiki Kaisha
InventorKoji Aoki
Life of this patent
Estimating the term…
Abstract
An attachment optical system detachably attached to an image capturing optical system, includes a first lens provided with a first aspherical surface including a plurality of concave portions and convex portions that are formed in a rotation direction with respect to an optical system, and a second lens provided with a second aspherical surface including a plurality of concave portions and convex portions that are formed in a rotation direction with respect to the optical axis, and a distance between the first aspherical surface and the second aspherical surface in an optical axis direction changes by relatively rotating the first lens and the second lens around the optical axis.
Claims26
An attachment optical system detachably attached to an image capturing optical system, the attachment optical system comprising:
- a first lens provided with a first aspherical surface, the first aspherical surface including a plurality of concave portions and a plurality of convex portions that are formed in a rotation direction with respect to an optical axis of the attachment optical system;
- and
- a second lens provided with a second aspherical surface, the second aspherical surface including a plurality of concave portions and a plurality of convex portions that are formed in the rotation direction,
- wherein, by relatively rotating the first lens and the second lens around the optical axis, a distance between the first aspherical surface and the second aspherical surface in a direction of the optical axis changes while a combined focal length of the first and the second lenses is unchanged.
An image capturing optical system comprising:
- a first lens provided with a first aspherical surface, the first aspherical surface including a plurality of concave portions and a plurality of convex portions that are formed in a rotation direction with respect to an optical axis of the image capturing optical system;
- and
- a second lens provided with a second aspherical surface, the second aspherical surface including a plurality of concave portions and a plurality of convex portions that are formed in the rotation direction,
- wherein, by relatively rotating the first lens and the second lens around the optical axis, a distance between the first aspherical surface and the second aspherical surface in a direction of the optical axis changes while a combined focal length of the first and the second lenses is unchanged.
An image capturing apparatus comprising:
- an image capturing optical system;
- and
- an image pickup device configured to receive an optical image formed via the image capturing optical system,
- wherein the image capturing optical system includes:
- a first lens provided with a first aspherical surface, the first aspherical surface including a plurality of concave portions and a plurality of convex portions that are formed in a rotation direction with respect to an optical axis of the image capturing optical system;
- and
- a second lens provided with a second aspherical surface, the second aspherical surface including a plurality of concave portions and a plurality of convex portions that are formed in the rotation direction,
- wherein, by relatively rotating the first lens and the second lens around the optical axis, a distance between the first aspherical surface and the second aspherical surface in a direction of the optical axis changes while a combined focal length of the first and the second lenses is unchanged.
Dependencies are inferred from the claim text.