| 摘要 |
<p>PURPOSE:To enable bar codes with a predetermined line width to be printed under a wide range of temperature variations, by a method wherein a heating pulse is split, the pulse width of each heating pulse is varied depending on variations in temperature, and the pulse-outputting time is shortened with the lapse of printing time. CONSTITUTION:A gate circuit is provided on the output side of a pulse-generating circuit, and pulse trains S1 (a high temperature time pulse train S1H, an intermediate temperature time pulse train S1I, a low temperature time pulse train S1L) are supplied to one input side of the gate circuit. In this case, a gate-controlling signal for shortening the gate-opening time with the lapse of code printing time is supplied to the other input side of the gate circuit. As a result, heating pulse trains S2 (a high temperature time heating pulse train S2H, an intermediate temperature time heating pulse train S2I, a low temperature time heating pulse train S2L) obtained by cutting off the pulse trains S1 for a period of time T proportional to the bar printing time regardlessly of temperature variations are outputted from the gate circuit, and are impressed on desired heating elements in a thermal head to generate heat, thereby printing bar codes on a printing sheet such as a thermal recording paper and an ordinary paper.</p> |
