Patents Represented by Attorney, Agent or Law Firm Weston Hsu
  • Scanner that controls stepping motor torque
    Patent number: 6414461
    Abstract: A scanner has a housing, a scanning module for scanning a document, a driving module for driving the scanning module, and a control circuit for controlling the scanner. The driving module comprises a stepping motor for driving the scanning module forward and backward so that the scanning module is able to scan the entire area of the document. The control circuit controls the stepping motor to generate different torque so that the scanning module can scan the document at different speeds.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: July 2, 2002
    Assignee: Mustek Systems Inc.
    Inventor: Te-Chih Chang