Lens apparatus capable of performing extension/retraction operation with respect to image pickup apparatus body and image pickup apparatus having the same
AssigneeCanon Kabushiki Kaisha
InventorYuichiro Kato
Life of this patent
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Abstract
A lens apparatus of the present invention includes a cam ring 7 having an inner circumferential surface on which first, second, and third cam groove portions 7a, 7b, and 7c with which first, second, and third cam followers 25, 26, and 6 provided on first, second, and third lens holding members 1, 2, and 3 engage. The cam ring introduces the first and second cam followers from an insertion opening 7d and includes an introducing groove portion 7b4 for introducing the third cam follower and a connecting groove portion 7a5. The third cam groove portion is divided at a middle of the introducing groove portion which connects the insertion opening with the second cam groove portion.
Claims6
A lens apparatus capable of performing an extension/retraction operation with respect to an image pickup apparatus body and of performing a zoom operation in an extended state, the lens apparatus comprising:
- a first lens holding member, a second lens holding member, and a third lens holding member configured to hold respective lenses;
- and
- a cam ring having an inner circumferential surface on which a first cam groove portion, a second cam groove portion, and a third cam groove portion with which a first cam follower provided in the first lens holding member, a second cam follower provided in the second lens holding member, and a third cam follower provided in the third lens holding member engage respectively, and configured to rotate around an optical axis in the extension/retraction operation and the zoom operation to move the first, second, and third lens holding members in an optical axis direction,
- wherein the cam ring including:
- an introducing groove portion configured to introduce the first and second cam followers from an insertion opening formed on an end surface of the optical axis direction of the cam ring to the second cam groove portion, and to introduce the third cam follower from the insertion opening to the third cam groove portion;
- and
- a connecting groove portion connecting the first cam groove portion with the second cam groove portion and configured to introduce the first cam follower introduced from the introducing groove portion to the second cam groove portion from the second cam groove portion to the first cam groove portion, and
- wherein the third cam groove portion is formed so as to be divided at a middle of the introducing groove portion which connects the insertion opening with the second cam groove portion.
An image pickup apparatus comprising:
- a lens apparatus capable of performing an extension/retraction operation with respect to an image pickup apparatus body and of performing a zoom operation in an extended state;
- and
- the image pickup apparatus body configured to take an object image formed by the lens apparatus,
- wherein the lens apparatus comprises:
- a first lens holding member, a second lens holding member, and a third lens holding member configured to hold respective lenses;
- and
- a cam ring having an inner circumferential surface on which a first cam groove portion, a second cam groove portion, and a third cam groove portion with which a first cam follower provided in the first lens holding member, a second cam follower provided in the second lens holding member, and a third cam follower provided in the third lens holding member engage respectively, and configured to rotate around an optical axis in the extension/retraction operation and the zoom operation to move the first, second, and third lens holding members in an optical axis direction,
- wherein the cam ring including:
- an introducing groove portion configured to introduce the first and second cam followers from an insertion opening formed on an end surface of the optical axis direction of the cam ring to the second cam groove portion, and to introduce the third cam follower from the insertion opening to the third cam groove portion;
- and
- a connecting groove portion connecting the first cam groove portion with the second cam groove portion and configured to introduce the first cam follower introduced from the introducing groove portion to the second cam groove portion from the second cam groove portion to the first cam groove portion, and
- wherein the third cam groove portion is formed so as to be divided at a middle of the introducing groove portion which connects the insertion opening with the second cam groove portion.
Dependencies are inferred from the claim text.