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:
Feb. 14, 2011
Filed:
Jan. 29, 2007
Applicants:
Noboru Yamamoto, Kariya, JP;
Yukio Kunieda, Nagoya, JP;
Inventors:
Noboru Yamamoto, Kariya, JP;
Yukio Kunieda, Nagoya, JP;
Assignee:
DENSO CORPORATION, Kariya, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/00 (2005.12);
U.S. Cl.
CPC ...
Abstract
An electric discharge lamp device has a lighting start voltage storage circuit for storing a lamp voltage immediately after the start of lighting of a lamp, and a change detection circuit for detecting a change in the lamp voltage by subtracting the lamp voltage immediately after the start of lighting of the lamp from the lamp voltage detected currently. The electric power supplied to the lamp is controlled based upon the change in the lamp voltage.