Camera having focus detection device

Details Camera having focus detection device Camera having focus detection device

1978-07-07

1981-01-27

Gellner, Michael L.

354 60R, G03B 310

Patent

active

042471877

ABSTRACT:
In the disclosed camera, when the object of principal photographic interest becomes so dim as to prevent 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. The camera can then be focused at an appropriate distance depending upon the size of diaphragm aperture, namely, in a pan-focus position.
According to an embodiment of the invention, an exposure control apparatus in the camera is made associated with the aforesaid two devices to operate in response to the taking lens having been set. The supplementary system is disabled until needed.

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

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