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:
Jul. 02, 1991
Filed:
Feb. 09, 1990
Applicant:
Inventors:
Assignee:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B / ;
U.S. Cl.
CPC ...
315160 ; 315172 ; 315226 ; 315307 ;
Abstract
A DC discharge lamp lighting device includes a main discharge means providing a main discharge-lamp current to a DC discharge lamp including a filament and at least one anode to form between them a discharge path. The main discharge means comprises means for switching an applied voltage between a main discharge starting voltage in synchronism with a luminance control signal and a main discharge maintaining voltage. Any contribution of a current limiting resistance element to power consumption in circuit operation upon lighting of the discharge lamp can be reduced, thereby reducing heat generation.