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. 10, 1992
Filed:
Aug. 31, 1989
Applicant:
Inventors:
Assignee:
Toshiba Lighting & Technology Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G / ;
U.S. Cl.
CPC ...
340780 ; 340811 ; 340813 ; 315307 ;
Abstract
A high frequency power source is coupled with a capacitor of a large capacitance. An electric power of the power source is supplied to a plurality of discharge lamps repsectively through lamp load circuits associated therewith. Each load circuit includes a transformer limiting current to the lamp, and a switching means for selectively supplying the electric power from the power source to the lamp, through the transformer. Two types of the switching means, open control type and short control type, are used for the switching means of the discharge load circuit.