| 摘要 |
PURPOSE:To decrease a dot concentration without computing the dot concentration which is to be printed hereafter, by detecting the temperature of a heat sink by attaching a heat sensor to the heat sink of a power transistor for a power source. CONSTITUTION:The signal of printing received with an interface signal 15 is supplied to a printing control circuit part 5. The current of a driving signal 16 being sent to a printing head 6 is altered according to a required dot concentration in the printing control circuit part 5. As the current of the driving signal 16 is altered to dc output 15 and the concentration of dot increases, the current of the dc output 12 is increased with this printing control circuit part 5. Thereby, the heat generation of a power transistor is increased resulting in the increase of the temperature of a heat sink 2. A temperature sensor 4 outputs an output signal 13 to the printing control circuit part 5 as the information of a temperature. The printing control circuit part 5 decreases a running dot concentration based upon said temperature information. |
