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:
May. 10, 2011
Filed:
May. 20, 2008
Noriyuki Takemasa, Yaizu, JP;
Noriyuki Takemasa, Yaizu, JP;
Murakami Corporation, Shizuoka, JP;
Abstract
The present invention is intended to, when rotation of a mirror rotation unit in a power-folding mirror is mechanically locked and its drive motor is thereby locked, make it possible to correctly detect this locked state. A motorfor a power-folding mirror is reversibly driven by an H-bridge drive circuitformed of FETsto. When the motoris driven in normal rotation by turning the FETsandon and turning the FETsandoff, the FETis periodically turned off to detect a voltage of a terminalof the motorby means of a voltage detection circuit. When the FETis turned off and the motoris not locked, the motorgenerates power by means of its inertial rotation, and when locked, the motorgenerates no power, so the voltage detected by the voltage detection circuitchanges according to whether or not the motoris locked. A CPUdetermines whether or not the motoris locked according to the voltage detected by the voltage detection circuit