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:
Jul. 11, 2000
Filed:
Apr. 16, 1999
Mototatsu Matsunaga, Shizuoka, JP;
Yazaki Corporation, Tokyo, JP;
Abstract
A lamp driving circuit of a vehicle turn/hazard system blinks a turn hazard lamp 10 by passing a current through a relay contact C of a relay RY intermittently. The relay contact of the relay RY is turned on earlier than a semiconductor switch 20 which is provided between a relay and a battery is, and the former is turned off later than the latter is. During the period while both the relay contact and semiconductor switch are ON, the turn/hazard lamp is illuminated. A first and a second pulse signal are generated to turn on/off the relay contact C and semiconductor device, respectively. The relationship therebetween is changed at regular or random intervals. In this configuration, the lamp driving circuit for a turn hazard system can minimize exhaustion of the relay contact and improve the endurance thereof.