Automatic focus detecting camera

Details Automatic focus detecting camera Automatic focus detecting camera

1984-04-02

1986-02-18

Adams, Russell E.

354286, G03B 1700

Patent

active

045710465

ABSTRACT:
An automatic focus detecting camera in which the full-aperture f-number of a lens mounted on the camera is automatically detected and applied to a focus detecting circuit. The lens is provided with indicating pins in a pattern indicative of a full-aperture f-number of the lens. Switch contact pins are provided on the lens mount of the camera positioned corresponding to the positions of the indicating pins, with the switch contact pins being operated in accordance with the presence or absence of the corresponding indicating pins. The states of the switch contact pins are decoded to provide data indicative of the full-aperture f-number of the lens. If the lens does not have any indicating pins, the decoding circuitry outputs a fixe value, which can be shifted by a manual switch on the body of the camera. Also, a manual switch may be provided on the body of the camera for instructing the full-aperture f-number in the case that the lens does not have any indicating pins.

REFERENCES:
patent: 4118713 (1978-10-01), Murakami et al.
patent: 4364652 (1982-12-01), Iwata et al.
patent: 4475800 (1984-10-01), Kinoshita et al.

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