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. 04, 2003
Filed:
Oct. 29, 2001
Masaaki Ishikawa, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A vehicle lamp system having a leveling mechanism for controlling the posture of a reflector RF and a stepping motor as a driving source of the leveling mechanism. The lamp system has a detector which may determine whether an external force, such as a vibration or a shock is given to the reflector RF or if there is a possibility that the vibration or shock may be given to the reflector. A rotor is prevented from being deviated from the original position by exciting each phase coil of the stepping motor with the same excitation phase as the last excitation phase at the time when the stepping motor was last driven or otherwise a coil in only one of the last excitation phases at the time when the stepping motor was last driven, and before vibration or a shock is given to the reflector RF after the coils in the respective phases are totally set to a non-excited condition in the stepping motor