| 摘要 |
PROBLEM TO BE SOLVED: To reduce effects of radiation noise generated from a thermal head, a thermal head control part and a cable which connects them. SOLUTION: A plurality of clocks of the same frequency and different phases are generated on the basis of a system clock. A data clock signal (CLOCK) which changes to a plurality of frequencies is generated from the plurality of clocks of the same frequency and different phases. Data turning on/off from a thermal head driving data generating part 14 is transferred by the data clock signal which changes to the plurality of frequencies and is held at a position corresponding to each of heating resistors R1-Rn by a shift register 41. Each of the heating resistors R1-Rn is electrified by the on/off data held by the shift register 41. The energy of noise is dispersed because the frequency of the data clock signal changes within a single-strobe period of time, so that the effects of radiated noise can be reduced. COPYRIGHT: (C)2009,JPO&INPIT |
