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US 5,627,683 AGranted
Lens barrel having a biasing member to prevent backlash between lens unit cam mechanisms
AssigneeNikon Corporation
InventorKazumitsu Takezawa
Life of this patent
Estimating the term…
Abstract
A lens barrel which has a lens holding member for holding a lens unit, a movement cam mechanism for moving the lens holding member in an optical-axis direction, a biasing member for biasing the lens holding member to shift a slide allowance of the movement cam mechanism in one direction, a biasing force receiving member for receiving a biasing force of the biasing member and a biasing force adjustment cam mechanism for moving the biasing force receiving member in the optical-axis direction so that the biasing force of the biasing member remains the same.
Claims6
A lens barrel comprising:
- a first lens holding member to hold a first lens unit;
- a second lens holding member to hold a second lens unit;
- a biasing force receiving member disposed between said first lens holding member and said second lens holding member and on a line that intersects said first lens holding member and said second lens holding member;
- and
- a biasing member disposed between said first lens holding member and said biasing force receiving member,
- wherein both said first and second lens holding members are movable along an optical axis direction in order to move said first and second lens units.
3 more elements
Dependencies are inferred from the claim text.