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:
Aug. 05, 2014
Filed:
Apr. 09, 2012
Saburo Miyamichi, Osaka, JP;
Saburo Miyamichi, Osaka, JP;
M-System Co., Ltd., Osaka, JP;
Abstract
In an LED lamp according to one embodiment of the present invention, a PWM control unitperforms PWM control of a current i flowing through an LED unitusing by driving a pulse at a frequency higher than a predetermined frequency when a frequency of an external alternating current inputted between input terminal partsis lower than the predetermined frequency, and does not perform PWM control of the current i flowing through the LED unitwhen a frequency of the external AC inputted between the input terminal partsis higher than the predetermined frequency. Accordingly, by replacing a previously mounted fluorescent lamp, the LED unit drives pulses at a high frequency and lights up for illumination, regardless of whether a ballast of an illumination device is of a glow starter, rapid starter or inverter lighting type.