| 摘要 |
PURPOSE:To lengthen the life of a thermal head as well as perform highly accurate recording by keeping the position of the thermal head under a condition corresponding to input recording signals, e.g., separating the head from a film when no input recording information is present. CONSTITUTION:The comparator circuit 37 of a head controller 34 sends out signals S during the period when all recording information is zero. When the signal S is sent out, a voltage is generated on the output end of a voltage generator 39 only during the period when the signal S is sent out. The voltage is applied to a bimorph piezo-electric element 32, resulting in the displacement of the element 32 toward a direction of separating a thermal head 30 from a film 29. The head 30, therefore, does not contact with the film 29 during the period when no recording information is present, that is, the period when recording is not needed. The wearing of the head 30 can thus be lessened and its life can be lengthened. Even the temperature rise of the film 29 by frictional heat can be suppressed, and the lowering of recording accuracy can be prevented.
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