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:
Dec. 20, 2005
Filed:
Jun. 06, 2003
Yoko Matsubayashi, Nara, JP;
Kenichiro Takahashi, Osaka, JP;
Kouji Miyazaki, Osaka, JP;
Satoshi Kominami, Osaka, JP;
Toshiaki Kurachi, Osaka, JP;
Mamoru Takeda, Kyoto, JP;
Yoko Matsubayashi, Nara, JP;
Kenichiro Takahashi, Osaka, JP;
Kouji Miyazaki, Osaka, JP;
Satoshi Kominami, Osaka, JP;
Toshiaki Kurachi, Osaka, JP;
Mamoru Takeda, Kyoto, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An electrodeless self-ballasted fluorescent lamp includes an electrodeless fluorescent lamp, a ballast circuitand a lamp base which are formed as one unit. The ballast circuitincludes: an AC-DC converter; a DC-AC converterformed so as to intermittently drive the electrodeless fluorescent lamp; and a dimming controllerformed so as to detect the turn-on of a phase-controlled AC voltage and output an intermittent command signal for changing the ratio between an operating period and an extinguishing period to the DC-AC converter. Furthermore, the dimming controlleris formed so as to output a signal for extinguishing the electrodeless fluorescent lampbefore the operation thereof becomes unstable.