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:
Feb. 09, 2010
Filed:
Aug. 22, 2007
Kazuhiro Asada, Yokkaichi, JP;
Kazuhiro Asada, Yokkaichi, JP;
Abstract
A headlamp control circuit reduces a possibility that all headlamps become lights-out in a two-lamp system headlight, even if a switching element fails under a high-beam condition while the single switching element is driven to light two right and left high-beam filaments. A headlamp control circuit includes switch sections (SW) and (SW) for lighting low-beam filaments () and (), a switch section (SW) for lighting high-beam filaments () and () together, a diode (D) for detecting an output voltage on the switch section SW, and a control section () for turning the switch section (SW) to an on-condition in the case where a high-beam indication is accepted and for turning the switch sections (SW) and (SW) to an on-condition in the case where a low-beam indication is accepted and in the case where a high-beam indication is accepted and the diode (D) detects no high-beam lighting voltage.