Actuating device for photographic lens assembly
AssigneeCanon Kabushiki Kaisha
InventorMasao Aoyagi
Life of this patent
Estimating the term…
Abstract
In an actuating device for a lens assembly, the lens system of the assembly is mounted in a lens holding member which must be axially moved for focusing the lens assembly. In order to effect axial movement of the holding member, an operating member is fitted on the outer diameter of a cylindrical lens barrel of the assembly to be rotatable about the optical axis of the assembly, with the operating member having an inner peripheral surface wherein there is formed a cam recess for controlling the degree of axial movement of the lens holding member. A cam follower member mounted on the lens holding member is fitted in the cam recess of the operating member and rotative motion of the operating member is converted into axial motion of the lens holding member.
Claims7
A device for actuating a movable lens defining an optical axis comprising:
- a lens holding member having said movable lens mounted therein, said lens holding member having an outer peripheral surface having formed thereon a cam part for controlling movement of said movable lens;
- a supporting member for supporting said lens holding member;
- an operating member for operating said movable lens;
- a cam following member fixedly mounted on said operating member;
- and
- adjusting means to adjust fixed positions of said cam following member and said lens holding member, said adjusting means operating to adjust the fixed position of said cam following member in the direction around said optical axis.
A device for actuating a movable lens defining an optical axis comprising:
- a lens holding member having said movable lens mounted therein;
- a supporting member for supporting said lens holding member;
- an operating member for operating said movable lens, said operating member having an inner peripheral surface having formed therein a cam part for controlling movement of said movable lens;
- a cam following member fixedly mounted on said lens holding member;
- and
- stopper means for restricting the rotational position of said operating member, said stopper means having a stopper member fitted in an opening through said supporting member, so as to have an upper end of said stopper member supported on an outer peripheral surface of said lens holding member, said upper end of said stopper member being engageable with a rotational restricting portion of said operating member.
A device for actuating a movable lens defining an optical axis comprising:
- a lens holding member having said lens mounted therein;
- a supporting member for supporting said lens holding member;
- an operating member for operating said movable lens;
- shifting means, provided between said lens holding member and said operating member, for shifting said movable lens along said optical axis;
- and
- stopper means for restricting the rotational position of said operating member,
- said stopper means having a stopper member fitted into an opening through said supporting member, so as to have an upper end of said stopper member supported on an outer peripheral surface of said lens holding member, said upper end of said stopper member being engageable with a rotation restricting portion of said operating member.
A device for actuating a movable lens comprising:
- a lens holding member having said movable lens mounted therein;
- a supporting member for supporting said lens holding member;
- an operating member for operating said movable lens, said operating member having an inner peripheral surface having formed therein a cam part for controlling movement of said movable lens;
- and
- a cam following member fixedly mounted on said lens holding member;
- and
- adjusting means to adjust fixed positions of said cam follower member and said lens holding member, said adjusting means operating to adjust the fixed position of said cam follower member in the direction around the optical axis.
Dependencies are inferred from the claim text.