Autofocus lens barrel
AssigneeNikon Corporation
InventorsYuji Ihara, Naoya Sugimoto
Life of this patent
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Abstract
An autofocus lens barrel has an optical system shifter for shifting a focusing optical system forward and backward in the direction of the optical axis, a driven pulley rotatively driven around the optical axis for actuating the optical system shifter, and a driving pulley which is driven by receiving a driving force. The driving force is transmitted from the driving pulley to the driven pulley by means of a belt. Preferably, an idler pulley should be proved at a position substantially symmetrical to the driving pulley with respect to the optical axis, and the driving force is transmitted from the driving pulley to the driven pulley and the idler pulley by means of a belt.
Claims4
An autofocus lens barrel comprising:
- optical system shifting means for shifting a focusing optical system forward or backward along an optical axis;
- a driven pulley rotatively driven around the optical axis for actuating said optical system shifting means, the driven pulley being rotatably seated in a fixed barrel of the lens barrel;
- a driving pulley to be driven by receiving a driving force;
- an idler pulley provided at a position substantially symmetrical to said driving pulley with respect to the optical axis;
- and
- a belt for transmitting the driving force from said driving pulley to said driven pulley and said idler pulley.
Dependencies are inferred from the claim text.