Document Type and Number:
Japanese Patent JPS5050347
Kind Code:
U
Abstract:
In an electronic shutter operating circuit for use in a photographic camera a differential amplifier comprising a pair of transistors is provided for comparing the photosensitivity of the film used and the brightness of the object to display over exposure and under exposure conditions. A voltage is positively fed back from the output of the differential amplifier to the input thereof to cause it to oscillate for displaying the correct exposure condition. There is provided a transfer switch to cause the differential amplifier to respond to the selected shutter time for closing the shutter when the shutter time expires.
Application Number:
JP10391873U
Publication Date:
May 16, 1975
Filing Date:
September 06, 1973
Export Citation:
International Classes:
G03B7/04; G03B7/083; G03B17/18; (IPC1-7): G03B7/08; G03B17/18
Domestic Patent References:
| JP43002609A |