Autoranging method and system for testing the speeds of a camera

Details Autoranging method and system for testing the speeds of a camera Autoranging method and system for testing the speeds of a camera

1976-07-22

1977-06-28

Swisher, S. Clement

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

324186, G03B 4302

Patent

active

040317390

ABSTRACT:
A camera shutter tester that automatically displays a standard shutter speed nearest to the actual speed of the shutter being tested and displays a ratio of that speed to the standard speed. A photodetector is placed in the focal plane of the camera that faces a light source and the photodetector's output is threshold detected and a logic circuit generates an initialization pulse. A voltage controlled oscillator dependent upon the photodetector's output feeds a countdown shift register that is in turn fed by a range shift register which also feeds range information to a ratio counter. The initialization pulse activates the range shift register, the countdown register, and the ratio counter. The frequency of the voltage controlled oscillator is divided by the output of the countdown shift register and the new frequency is fed to the ratio counter which in turn delivers a range change pulse to the range shift register. The output of the range shift register and the ratio counter are fed to displays that are latched by the threshold detector.

REFERENCES:
patent: 3760629 (1973-09-01), Westharer
patent: 3946592 (1976-03-01), Ichikawa

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