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. 01, 2011
Filed:
Jan. 16, 2007
Katunobu Hamamoto, Neyagawa, JP;
Kei Mituyasu, Hirakata, JP;
Yosikazu Kado, Suita, JP;
Hirosi Murayama, Jakarta, ID;
Hiroyuki Hirose, Nishinomiya, JP;
Katunobu Hamamoto, Neyagawa, JP;
Kei Mituyasu, Hirakata, JP;
Yosikazu Kado, Suita, JP;
Hirosi Murayama, Jakarta, ID;
Hiroyuki Hirose, Nishinomiya, JP;
Panasonic Electric Works Co., Ltd., Osaka, JP;
Abstract
In order to suppress cost of an initial investment by a user and running cost to the user to a low extent while substantially constantly maintaining an apparent illuminance, and further, to realize resource saving, in a case of using a fluorescent lamp FHFas a discharge lamp La, a lamp supply power is started to be supplied from a value lower than 45 W as rated electric power at an initial period of an operation of the discharge lamp, a light adjustment signal is changed in response to an accumulated lighting time so that the lamp supply power can be a value higher than 45 W as the rated electric power on and after a rated lifetime of the discharge lamp La, whereby the lamp supply power (output of an inverter circuit) is adjusted. In the fluorescent lamp FHF, a light/electric power ratio becomes substantially constant when the lamp supply power is 41 W to 55 W, and accordingly, a light quantity is increased without impairing light emission efficiency of the discharge lamp La, and as a result, the apparent illuminance can be maintained substantially constantly.