Lens barrel having suppressed load torque and moment of inertia

Details Lens barrel having suppressed load torque and moment of inertia Lens barrel having suppressed load torque and moment of inertia

1995-04-21

1996-07-02

Epps, Georgia Y.

Optical: systems and elements

Lens

With support

359694, 359696, 359699, G02B 702, G02B 1514

Patent

active

055328830

ABSTRACT:
A lens barrel having a focusing optical system, a rotatable moving member for moving the focusing optical system for the focusing operation, an rotatable operating mechanism for driving the moving member for focusing, a biasing member for giving a friction torque to the rotation of the operating mechanism, a driving member secured to the operating mechanism for rotating the moving member, a connecting device secured to the operating mechanism for connecting and non-connecting the operating mechanism with the moving member, and a detecting device for detecting the rotation of the operating mechanism. Auto focusing is possible when the connecting device is in its non-connecting state and the focusing optical system is driven by the driving member through the moving member. When during the auto focusing operation the rotation of the operating mechanism is detected by the detecting device, the autofocusing operation is immediately stopped and the operating mechanism is connected to the moving member by the connecting device to perform manual focusing of the optical system by the operating mechanism through the moving member.

REFERENCES:
patent: 4796045 (1989-01-01), Hamanashi
patent: 4963000 (1990-10-01), Kawai
patent: 4964697 (1990-10-01), Fuziwara
patent: 5144493 (1992-09-01), Nomura
patent: 5239415 (1993-08-01), Imanari
patent: 5264966 (1993-11-01), Okada

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