Optical accessory adapter
AssigneeCanon Kabushiki Kaisha
InventorAkira Yokoyama
Life of this patent
Estimating the term…
Abstract
An optical accessory adapter is used to couple together a lens apparatus and an optical accessory attached to an object side portion of the lens apparatus having fitting attachment diameters different from each other. The adapter is provided with a cutout portion in a part of a region outside the attachment diameter of the lens apparatus on an object side surface thereof.
Claims19
An adapter for coupling an optical accessory to an object side portion of the lens apparatus, where a fitting attachment diameter of the optical accessory is larger than a fitting attachment diameter of the lens apparatus, the adapter comprising:
- an inner diameter portion that fits the object side portion of the lens apparatus;
- an outer diameter portion that fits the optical accessory;
- and
- recessed areas that are separated from each other along a circumferential direction of the inner diameter portion,
- wherein a diameter of the outer diameter portion is larger than a diameter of the inner diameter portion, and
- wherein each of the recessed areas extends in an axial direction toward a side from which the lens apparatus is fit so that a width of a part of the inner diameter portion in the axial direction is smaller than a width in the axial direction in other part of the inner diameter portion.
An optical system comprising:
- a lens apparatus;
- an optical accessory;
- and
- an adapter that couples the optical accessory to an object side portion of the lens apparatus,
- wherein a fitting attachment diameter of the optical accessory is larger than a fitting attachment diameter of the lens apparatus,
- wherein the adapter comprises:
- an inner diameter portion that fits the object side portion of the lens apparatus;
- an outer diameter portion that fits the optical accessory;
- and
- recessed areas that are separated from each other along a circumferential direction of the inner diameter portion,
- wherein a diameter of the outer diameter portion is larger than a diameter of the inner diameter portion, and
- wherein each of the recessed areas extends in an axial direction toward a side from which the lens apparatus is fit so that a width of a part of the inner diameter portion in the axial direction is smaller than a width in the axial direction in other part of the inner diameter portion.
An image pickup apparatus comprising:
- a lens apparatus;
- and
- an adapter that couples an optical accessory to an object side portion of the lens apparatus,
- wherein a fitting attachment diameter of the optical accessory is larger than a fitting attachment diameter of the lens apparatus, and
- wherein the adapter comprises:
- an inner diameter portion that fits the object side portion of the lens apparatus;
- an outer diameter portion that fits the optical accessory;
- and
- recessed areas that are separated from each other along a circumferential direction of inner diameter portion,
- wherein a diameter of the outer diameter portion is larger than a diameter of the inner diameter portion, and
- wherein each of the recessed areas extends in an axial direction toward a side from which the lens apparatus is fit so that a width of a part of the inner diameter portion in the axial direction is smaller than a width in the axial direction in other part of the inner diameter portion.
Dependencies are inferred from the claim text.