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:
Jun. 14, 1983
Filed:
Oct. 30, 1980
Applicant:
Inventor:
Arthur Walter, Waldkirch, DE;
Assignee:
Erwin Sick Gesellschaft-Optik-Elektronik, Waldkirch, DE;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
250221 ; 2502 / ; 250209 ;
Abstract
A photoelectronic apparatus, in which a photoelectric convertor (the operational convertor) receives a beam of light and produces an output signal proportional to the intensity of the light received, is protected against the effects of unwanted light by providing an auxiliary photoelectric convertor arranged in the vicinity of the operational convertor. The auxiliary convertor detects the presence of unwanted light and its output is subtracted from that of the operational convertor and the resultant signal is then examined to distinguish between events occuring in the light beam and events simulated by the unwanted light.