Exposure control device for automatic focusing camera

Details Exposure control device for automatic focusing camera Exposure control device for automatic focusing camera

1978-11-17

1980-06-24

Griffin, Donald A.

354195, 354234, G03B 708, G03B 908, G03B 1302

Patent

active

042092426

ABSTRACT:
An automatic focusing camera capable of automatically focusing the photographic lens thereof by a system actuated by a signal produced by a focus detection circuit when the distance between the object to be photographed by the camera is detected includes an exposure control device comprising an exposure control circuit and an electromagnet. A photographic lens focusing member is movable in response to the shutter release operation and is stopped in response to the magnetizing of the electromagnet. An exposure device is actuated to open to start the exposure after the photographic lens focusing member is stopped, and is closed in response to the demagnetizing of the electromagnet which occurs upon the receipt thereof of the exposure completion signal generated by the exposure control circuit. In this way, a common electromagnet is used for both the focus control and the exposure control to simplify the construction of the camera and to reduce the cost thereof.

REFERENCES:
patent: 3208365 (1965-09-01), Cooper et al.
patent: 3698304 (1972-10-01), Tenkumo
patent: 3713371 (1973-01-01), Kurihara et al.

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