Camera having focus detection device

Details Camera having focus detection device Camera having focus detection device

1980-12-31

1982-06-08

Gellner, Michael L.

354 60R, G03B 310

Patent

active

043337171

ABSTRACT:
A camera having a focus detecting device for automatically detecting a condition of sharpest focus. According to an improvement of the invention, when the brightness level of an object of principal photographic interest becomes so low as not to permit satisfactory operation of the focus detecting device, or when the actual voltage of a battery falls below a satisfactory operating level for the device, a supplementary device can be rendered operative to control setting of a photo-taking lens independently of the focus detecting device, thereby the camera can be focused at an appropriate distance depending upon the size of diaphragm aperture, namely, in a pan-focus position.
According to a further improvement of the invention, an exposure control apparatus in the camera is made associated with the aforesaid two devices in a manner to be rendered operative in response to an accomplishment of setting the taking lens.

REFERENCES:
patent: 3618499 (1971-11-01), Harvey
patent: 3836919 (1974-09-01), Matsumoto et al.
patent: 3936187 (1976-02-01), Momose
patent: 4126874 (1978-11-01), Suzuki et al.
patent: 4154517 (1979-05-01), Tamura et al.
patent: 4156563 (1979-05-01), Kato et al.
patent: 4247187 (1981-01-01), Tamura

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