| 摘要 |
PURPOSE:To obtain stable images with high quality even on rapid variations in the temperature of a head substrate, by providing a temperature table for selecting a heat generation reference for a thermal head according to variations in the temperature of the head substrate, and correcting the calorific value of the head according to the rate of change of the head substrate temperature with recording time. CONSTITUTION:When recording is started and heat generating elements 7a generate heat according to an image signal, substrate temperature information is sent, as required, from a thermistor 10 fitted to a substrate 7b to a CPU 14a, and a pulse duration of heating pulses corresponding to the substrate temperature information is selected from a temperature table stored in a ROM 14b. Simultaneously with heat generation, a platen roller 6 is rotated at a fixed speed to feed a recording sheet 1 and an ink sheet 4, whereby predetermined recording is performed. When the temperataure of the head substrate 7b is rapidly raised at least in a predetermined degree, namely, when the rate of change of the temperature of the substrate 7b reaches or exceeds a certain value (which is determined for each particular recorder radiation characteristics of the substrate 7b or the like) due to black solid recording or the like, a correction for further reducing the pulse duration of the heating pulses is performed, and after recording for a predetermined period of time or for a predetermined recording length with the pulse duration, the pulse duration is returned to the original predetermined duration, and recording is performed. |
