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:
Oct. 09, 1979
Filed:
Dec. 27, 1977
Leonard G Rich, West Hartford, CT (US);
Henry F Berdat, Manchester, CT (US);
The Gerber Scientific Instrument Company, South Windsor, CT (US);
Abstract
A circuit is disclosed for flashing a flash lamp in a photoexposure device which exposes lines on a photosensitive surface by projecting onto the surface a repetitive series of light spots the locus of which is moved relative to the surface so that the individual light spots partially overlap one another as a chain to synthesize the desired line. During each flash cycle, started by a cycle initiate pulse from an associated control circuit, conduction through the lamp is initiated by a high voltage pulse produced by the discharge of a triggering capacitor, through a high voltage pulse generating circuit, and conduction is thereafter continued by the discharge of a firing capacitor which supplies power at a lower voltage to the lamp. To optimize the maximum rate at which the lamp may be flashed the circuit operates, during each flash cycle, to trigger discharge of the capacitors immediately, or almost immediately, upon their reaching their desired charge. The flashing circuit also automatically compensates for changes in the voltage level at which the flash lamp extinguishes in each flash cycle, thereby maintaining the amount of light produced per flash relatively constant despite such changes.