Automatic diaphragm aperture control

Details Automatic diaphragm aperture control Automatic diaphragm aperture control

1975-07-11

1976-10-19

Peters, Jr., Joseph F.

354 60R, G03B 708

Patent

active

039874605

ABSTRACT:
An automatic diaphragm aperture control device for use in a camera for controlling the setting of the diaphragm with a high degree of accuracy. The diaphragm is adapted to be stopped down in association with the releasing operation of a shutter. During this stop down operation, the output of a light measuring circuit of the camera measures the light from a photographic image, which has passed through an objective lens and a diaphragm aperture. The output of the light measuring circuit is then compared with the output of an output circuit which corresponds to a pre-selected shutter speed. When the difference between the two outputs reaches a given level, the operation of an electromagnet is reversed so as to thereby cause the locking of the diaphragm and stopping its stopping-down operation. In this control device, a voltage proportional to a differentiated value of the output of the light measuring circuit with respect to time is produced by a differentiating circuit and is added to the difference between the two outputs, for assisting in the control of the diaphragm aperture.

REFERENCES:
patent: 3777637 (1973-12-01), Kuromoto et al.
patent: 3818494 (1974-06-01), Tonikoshi et al.
patent: 3833913 (1974-09-01), Wick et al.
patent: 3889277 (1975-06-01), Ogiso et al.

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