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. 11, 2014
Filed:
Jul. 03, 2012
Masafumi Yamamoto, Kyoto, JP;
Katunobu Hamamoto, Osaka, JP;
Hiroyuki Asano, Hyogo, JP;
Hisaya Takikita, Osaka, JP;
Hiroyuki Nakagawa, Hyogo, JP;
Yuji Yoshimoto, Hyogo, JP;
Masafumi Yamamoto, Kyoto, JP;
Katunobu Hamamoto, Osaka, JP;
Hiroyuki Asano, Hyogo, JP;
Hisaya Takikita, Osaka, JP;
Hiroyuki Nakagawa, Hyogo, JP;
Yuji Yoshimoto, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
An LED lighting device includes: a power source unit for supplying the DC output voltage to a light-emitting diode; a control unit for adjusting the DC output voltage; and a control power source unit for supplying a control power to the control unit. The control power source unit generates the control power with the DC output voltage and has: a current-limiting resistor for limiting an electric current that flows from the power source unit to the control unit; a constant voltage unit for converting a voltage to be applied to the control unit through the current-limiting resistor unit to a constant voltage; and a switching unit for switching a resistance value of the current-limiting resistor unit among a plurality of resistance values.