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. 10, 2001
Filed:
Aug. 05, 1999
Stepping motor control unit and method, printer employing the same, and information recording medium
Yoshiharu Matsumoto, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A stepping motor control unit is capable of driving a stepping motor fast through feedback control. Slits bored in a disk fixed to a rotor of a stepping motor are located at positions that precede magnetically stable positions of the rotor in a direction of rotation of the rotor. Light passing through the slits is detected by an optical sensor, and a signal t is output thereby. The signal t is delayed by a predetermined time according to the rotating speed of the rotor and then transmitted to a control unit. The control unit receives a position detection signal earlier according to the rotating speed of the rotor. Therefore, the wait time required for switching phases can be shortened. Moreover, when the signal t is generated twice or more during a signal t detection time during which a signal t indicating a certain phase is detected, the second and subsequent signals t are ignored. Thus, incorrect detection can be avoided.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile