Automatic focusing apparatus for a telephotographic system

Details Automatic focusing apparatus for a telephotographic system Automatic focusing apparatus for a telephotographic system

1997-02-26

1999-02-16

Ben, Loha

Optical: systems and elements

Lens

With variable magnification

359823, 396 85, 396104, 396137, 35613906, 2502032, G02B 1514

Patent

active

058726616

ABSTRACT:
An automatic focusing apparatus for a telephotographic system includes a telephotographic system which moves a focusing lens along an optical axis to control the focus, a focus detector which detects the focus state through the telephotographic system, a lens moving device which moves the focusing lens, a controller which drives the lens moving device in accordance with the focus state detected by the detector to move the focusing lens to thereby control the focus, and an external operation device which actuates the controller to perform the focusing operation. The controller continues the focusing operation until the focusing operation is completed when the external operation device is actuated.

REFERENCES:
patent: 4893145 (1990-01-01), Matsuda
patent: 5144491 (1992-09-01), Ushiro et al.
patent: 5216480 (1993-06-01), Kaneko et al.
patent: 5266982 (1993-11-01), Soshi
patent: 5438190 (1995-08-01), Kaneda et al.
patent: 5715101 (1998-02-01), Nakamura et al.

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