Patents Examined by Gerald L. Preston
  • Method of driving thermal head
    Patent number: 4873535
    Abstract: A driving method for a thermal head which has a plurality of thermal resistance elements arranged in a line. The thermal resistance elements are electrically separated into first and second blocks. Then, a heat pulse is applied to all the necessary thermal resistance elements in the first block. Next, a heat pulse is applied to all the necessary thermal resistance elements in the second block. These applying operation are alternately repeated in sequence until the required density is obtained.
    Type: Grant
    Filed: May 20, 1988
    Date of Patent: October 10, 1989
    Assignee: Ricoh Company, Ltd.
    Inventor: Eiichi Sasaki