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:
Jun. 16, 2009
Filed:
Jul. 15, 2005
Applicants:
Tomoyuki Ichikawa, Shizuoka, JP;
Takuya Serita, Shizuoka, JP;
Inventors:
Tomoyuki Ichikawa, Shizuoka, JP;
Takuya Serita, Shizuoka, JP;
Assignee:
Koito Manufacturing Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H05B 39/04 (2006.01); H05B 37/02 (2006.01); H05B 41/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
In the transient electric power control of a discharge lamp containing no mercury or a small amount of mercury, a change value relating to a lamp voltage from the initial value thereof is detected. A control unit is provided to change the temporal change rate of electric power supplied to the discharge lamp during the transient time period in accordance with the increase of the change value or the time lapse.