Universal light integrator/timer for photographic equipment

Details Universal light integrator/timer for photographic equipment Universal light integrator/timer for photographic equipment

G - Physics

03

B

315/13

G03B 27/72 (2006.01)

Patent

CA 1181794

Abstract of the Disclosure A universal light integrator/timer is provided for use with photographic equipment wherein several desired exposure intervals for each of a plurality of light sources may be preset and stored in a microprocessor for instant selection by the operator during a photographic operation. When a stable light source is used the system is arranged to function as a timer and counts pulses derived from the AC line to control the light source in accordance with the preset exposure intervals. When a light source is used whose wavelength and intensity varies during warmup, the system is arranged to function as a light integrator. To obtain light integration the current flowing in a photodiode, which is linear with respect to light output, is amplified and converted to variable frequency pulses which are counted by the micro- processor to control the light source in accordance with the present exposure intervals.

373180

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