Autofocus lens barrel

Details Autofocus lens barrel Autofocus lens barrel

1992-06-24

1994-03-08

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359696, 359823, G02B 1514, G02B 702

Patent

active

052932680

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.

REFERENCES:
patent: 3324780 (1967-06-01), Miyauchi
patent: 4303320 (1981-12-01), Isono
patent: 4531831 (1985-07-01), Kitajima et al.
patent: 4555165 (1985-11-01), Negoro
patent: 4866477 (1989-12-01), Barry et al.
patent: 5029992 (1991-07-01), Richardson
patent: 5130851 (1992-07-01), Shirie
patent: 5144491 (1992-09-01), Oshino et al.

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