Automatic focusing apparatus

Details Automatic focusing apparatus Automatic focusing apparatus

1985-01-02

1988-12-13

Adams, Russell E.

354402, 354408, 354286, G03B 300

Patent

active

047906499

ABSTRACT:
The invention relates to an automatic focusing apparatus, particularly, of a type wherein a lens drive amount is calculated by circuits in a camera in accordance with an output from a focusing detection circuit, the calculation result is transmitted to a lens mounted on the camera, and the lens is driven accordingly. While the lens unit is driven for a distance corresponding to the calculation result, operation of the focusing detection circuit of the camera is prohibited by sending a signal for prohibiting the operation of the focusing detection circuit thereto through a contact for transferring data from the camera to the lens unit in modes other than the lens drive mode. The number of contacts between the camera and the lens unit is reduced.

REFERENCES:
patent: 4437752 (1984-03-01), Akashi et al.
patent: 4477164 (1984-10-01), Nakai et al.
patent: 4509842 (1985-04-01), Taniguchi et al.
patent: 4529288 (1985-07-01), Nakai et al.
patent: 4557579 (1985-12-01), Nakajima

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