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:
May. 12, 2015
Filed:
Jan. 17, 2011
Masahiro Yamamoto, Osaka, JP;
Syunsuke Ono, Osaka, JP;
Masahiro Yamamoto, Osaka, JP;
Syunsuke Ono, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
From a start of a lighting until a predetermined time period passes, a high-pressure discharge lamp is supplied with a constant current (Ib) until the lamp power reaches a predetermined wattage (P). When the lamp power reaches the wattage (P), current is supplied to maintain the lamp power at the wattage (P). After another predetermined time period passes, current is supplied to maintain the lamp power at a rated lamp wattage (Pr). While this lamp power is being maintained, the size of the lamp current is limited to a current limit (Ia). The current (Ib) and the wattage (P) satisfy a relationship Ia·0.7≦Ib≦Ia·0.9 and Pr·0.5 P≦Pr·0.9 to accelerate an initial building of luminous flux while reducing drainage to the electrodes.