Multi-exposure control device for cameras

Details Multi-exposure control device for cameras Multi-exposure control device for cameras

1975-07-21

1976-07-27

Peters, Jr., Joseph F.

354 28, 354 29, 354 30, 354 36, 354 40, 354 50, 354 60R, G03B 708

Patent

active

039720551

ABSTRACT:
The multi-exposure control device is provided with an automatic mechanism for stopping-down the diaphragm from an open position prior to exposure. A diaphragm adjusting ring stops the stopping-down operation at the pre-selected diaphragm aperture. An automatic exposure time control signal is generated from the light passing through the objective lens and stopped-down diaphragm aperture. A shutter speed selecting member provides a first mode for manual selection of the shutter speed and a second mode for automatic shutter exposure control.
The device is switchable between a manual exposure control mode wherein both the shutter speed and diaphragm aperture are manually selected prior to exposure and an automatic exposure control mode having an automatic shutter speed control or automatic diaphragm aperture control. With the shutter speed manually selected, the exposure control device compares an output signal corresonding to the manually selected shutter speed with the automatic exposure time control signal to stop the aforesaid diaphragm stopping-down operation for automatic control of the diaphragm and then the shutter speed is automatically controlled according to the output of the automatic exposure time control signal circuit, which output is dependent upon the adjusted diaphragm aperture. In the automatic shutter speed control mode, the shutter speed is controlled to afford an optimum exposure for the diaphragm aperture which has been previously manually adjusted prior to exposure.

REFERENCES:
patent: 3464332 (1969-09-01), Davison et al.
patent: 3491670 (1970-01-01), Rentschler
patent: 3563141 (1971-02-01), Stanp
patent: 3893133 (1975-07-01), Tsujimoto et al.
patent: 3898675 (1975-08-01), Ono
patent: 3899789 (1975-08-01), Taguchi

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