Optics: measuring and testing – Photometers – Integrating
Patent
1978-03-31
1980-05-20
Hille, Rolf G.
Optics: measuring and testing
Photometers
Integrating
356224, 356225, G01J 142
Patent
active
042036682
ABSTRACT:
The meter senses flashes of illumination, it converts the illumination to an electrical current whose magnitude is proportional to the intensity of the illumination; it integrates the current over a period of time corresponding to a selected shutter speed by charging a capacitor; it discharges the capacitor and measures the time required to do so; it converts the time required to discharge the capacitor into a corresponding signal representative of an appropriate camera aperture setting for a preselected film sensitivity and shutter speed via a microprocessor and a stored data program; and then displays the camera aperture setting on a multi-segment display. This process is repeated with each new flash of illumination automatically. The meter also measures multiple flashes and displays an accumulated camera aperture setting as well as the number of flashes needed to accumulate that setting.
REFERENCES:
patent: 2202441 (1940-05-01), Bernhard et al.
patent: 3049050 (1962-08-01), Thomas
patent: 3574443 (1971-04-01), Nanba
patent: 3709615 (1973-01-01), Blakeslee
Walter W. Schopp "Electronic Photo Flash Meter" Electronics World, vol. 83, No. 6, Jun. 1970, pp. 62-63.
Creative Phototronics, Inc.
Hille Rolf G.
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