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. 22, 2010
Filed:
Feb. 15, 2008
Masayasu Ito, Shizuoka, JP;
Takayoshi Kitagawa, Shizuoka, JP;
Kentarou Murakami, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
In conduction of light emitting diodes LEDsto, a switching signalis converted into a voltage Vor 0V through a signal converterin accordance with a logic level thereof. The voltage obtained by the conversion is compared with a voltage Von both ends of a resistor Rthrough an operational amplifierto open/close an output loop by an NMOS transistor, a current If of the light emitting diodes LEDstois limited to a current Ifso as not to exceed a maximum current, and a current defined with an ON duty of the switching signalis caused to flow as a mean current to the light emitting diodes LEDstoto inhibit an overshoot current from flowing to the light emitting diodes LEDstowhile the output loop is closed.