Automatic focusing camera

Details Automatic focusing camera Automatic focusing camera

1988-01-26

1989-08-01

Adams, Russell E.

3541951, 354286, G03B 300

Patent

active

048537322

ABSTRACT:
An automatic shutter driving device releasable when the image of a subject is sharply focused comprises a mode selection switch, enable-signal generating means, logic circuit, and a shutter driving circuit. The mode selection switch is mounted on a camera body having an automatic focusing function and selects at least a single mode or another mode, such as a continuous servo mode or a manual mode. The enable-signal generating means generates an enable-signal when the mode selection switch selects the single mode after a photographic lens having no automatic focusing function has been mounted on the camera body. The logic circuit executes logic operations of the enable signal and a detection output signal derived from a decision means for deciding whether the image of a subject is sharply focused or out-of-focus, thereby delivering a shutter driving signal. The shutter driving circuit drives a shutter in response to the shutter driving signal derived from the logic circuit.

REFERENCES:
patent: 4445767 (1984-05-01), Kawazoe
patent: 4609274 (1986-09-01), Iwashita et al.
patent: 4684232 (1987-08-01), Kazami
patent: 4734730 (1988-03-01), Ootsuka et al.
patent: 4737812 (1988-04-01), Hasegawa et al.

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