The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1982
Filed:
Apr. 10, 1980
William P Waiwood, Cleveland, OH (US);
The Nuarc Company, Inc., Chicago, IL (US);
Abstract
A universal light intergrator/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 microprocessor to control the light source in accordance with the present exposure intervals.