| 摘要 |
PROBLEM TO BE SOLVED: To control temp. with high accuracy and to improve durability, without adversely affecting a fixture such as a lighting fixture. SOLUTION: At the time of standing by, each heater is turned off (S1 and S2) and when the detected temp. (tth) of a thermistor becomes the heating start. temp. (tson) of a subheater or below, the subheater is turned on (S4). After that, when the detected temp. (tth) reaches a heating stop temp. (tsoff), the subheater is tuned off (S5→S6). After that, when the detected temp. (tth) becomes the heating start, temp. (tmon) of a main heater or below, the main heater is turned on (S7→S8). When the detected temp. (tth) becomes the heating stop temp. (tmon) of the main heater, the main heater is turned off (S9→S10) and returning to the S3 is attained to repeat the above-processing. On the other hand, driving and nondriving periods are provided for each heater, in a fixed very short, period, at the time of printing and the turns of the periods are switched in each cycle, to control the temp. |
