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:
Aug. 15, 2006
Filed:
Jun. 30, 2003
Susumu Okura, Tokyo, JP;
Takashi Ohsawa, Tokyo, JP;
Susumu Okura, Tokyo, JP;
Takashi Ohsawa, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A discharge bulb ballast has a control circuit () that includes a turning point detecting unit () for detecting a turning point at which a bulb voltage starts rising after switching on a discharge bulb (). Immediately after switching on the discharge bulb (), a power control unit () carries out control in such a manner that the discharge bulb () is supplied with first power. When the turning point detecting unit () detects that the voltage of the discharge bulb () exceeds the turning point, the power control unit () supplies the discharge bulb () with second power less than the first power.