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:
Jan. 02, 2007
Filed:
Feb. 01, 2005
Takao Inoue, Kawagoe, JP;
Takao Inoue, Kawagoe, JP;
Pioneer Corporation, Tokyo, JP;
Abstract
First resistors (R, R) for setting a forward current value are connected in series to light-emitting diodes (LED, LED) respectively to constitute first serial circuits (), which are connected to an input terminal (). Second serial circuits () are connected in parallel to the first serial circuits () respectively. The second serial circuits () are constituted by a combination of a Zener diode (ZD) and a second resistor (R), and another combination of a Zener diode (ZD) and a second resistor (R). When a higher voltage than rated voltages of the light-emitting diodes (LED, LED) is applied, the Zener diodes (ZD, ZD) shunt current into the second serial circuit () to allow the light-emitting diodes (LED, LED) to light up at desirable luminance levels different from each other. When a supplied power voltage decreases, current is not shunted, so that the same forward current flows through the light-emitting diodes (LED, LED), allowing the light-emitting diodes (LED, LED) to go off at the same timing.