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:
Nov. 23, 1993
Filed:
May. 14, 1992
Takahiro Kawauchi, Furukawa, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
The invention concerns with a system for controlling a stepping motor, and more particularly with a stepping motor control system which moves a head of a disk drive unit with (1-2)-phase excitation. With the stepping motor controlling system, a driving force is produced to rotate the stepping motor by a predetermined angle with the (1-2)-phase excitation for ech step pulse supplied from the exterior, and step pulses with a plurality of cycles are used to make the stepping motor rotate at different speeds depending on the cycles of the step pulses. In that controlling system, a time period of the 1-phase excitation is changed depending on the pulse interval of the step pulses, thereby reducing a level of noisy sounds like seek noise.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile