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:
Jun. 10, 2003
Filed:
Jul. 10, 2001
Yutaka Saito, Tokyo, JP;
Kouei Ozaki, Tokyo, JP;
Toshiaki Narukawa, Tokyo, JP;
Tsutomu Ota, Uji, JP;
Takion Co., Ltd., Tokyo, JP;
Abstract
An LED lamp device of the invention includes a power supply unit ( ) supplied with an alternating-current power supply voltage, and an LED lamp ( ) constituted by one or a plurality of serially connected LEDs connected to output terminals of the power supply unit ( ). The power supply unit ( ) obtains a rectified wave of the alternating-current power supply voltage, admits electric power for only part of a time period in which the voltage of the rectified wave corresponding to each half period of the wave of the alternating-current power supply voltage is higher than or equal to a predetermined value, and uses the electric power as power for lighting the LED lamp ( ).