Patents Represented by Law Firm Sughrue, Mion, Zinn, Seas & Macpeak
  • Thermal head driving method
    Patent number: 4415904
    Abstract: A method of driving a thermal printing head includes expanding the printing time for a line which follows successive non-printed (blank) lines. In this manner, deterioration otherwise caused in the print density can be avoided without employing an auxiliary heater for the thermal head. Instead of expanding the printing time, the applied voltage may be increased to achieve the same result.
    Type: Grant
    Filed: April 27, 1982
    Date of Patent: November 15, 1983
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Toshiharu Inui, Haruhiko Moriguchi