Lens unit
AssigneeNittoh Inc.
InventorTakafumi HANAOKA
Life of this patent
Estimating the term…
Abstract
A lens unit includes a lens barrel holding lenses and an attachment attached to an end portion of the lens barrel in a detachable manner. The lens barrel includes magnets for attaching the attachment to the end portion of the lens barrel. The attachment includes magnets attracted to the magnets. The lens barrel has a contact surface for positioning the attachment to the lens barrel in a direction orthogonal to an optical axis direction of the lenses. The contact surface is an inclined surface inclined with respect to the optical axis direction of the lenses. The attachment has a contact surface in contact with the contact surface.
Claims20
A lens unit comprising:
- a lens barrel that holds lenses;
- and
- an attachment that is attached to the lens barrel at an end portion of the lens barrel in an optical axis direction of the lenses in a detachable manner, wherein
- either one of the lens barrel and the attachment includes first magnets that are permanent magnets and used for attaching the attachment to the end portion of the lens barrel,
- the other of the lens barrel and the attachment includes second magnets that are permanent magnets and attracted to the first magnets or soft magnetic bodies that are attracted to the first magnets,
- either one of the lens barrel and the attachment has a first contact portion that is used for positioning the attachment to the lens barrel in a direction orthogonal to the optical axis direction of the lenses,
- the first contact portion is an inclined surface that is inclined with respect to the optical axis direction of the lenses, and
- the other of the lens barrel and the attachment has a second contact portion that is in contact with the first contact portion.
Dependencies are inferred from the claim text.