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:
Apr. 13, 1976
Filed:
Apr. 17, 1975
Applicant:
Inventors:
Douglas E Webb, Rochester, NY (US);
Russell G Schroeder, II, Webster, NY (US);
Assignee:
Xerox Corporation, Stamford, CT (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250205 ; 250227 ; 315149 ;
Abstract
Control and switching circuits for maintaining appropriate balance of light output of a long multi-vapor arc lamp. The control circuit includes sensing, amplifier-reference, phase amplitude detector, time base generator and lamp switching logic branches. The switching circuit includes a silicon controlled rectifier bridge for reversing the polarity of current flow through the lamp. The silicon controlled rectifier bridge is triggered by output pulse chains from the lamp switching logic branch in the control circuit.