| 摘要 |
PROBLEM TO BE SOLVED: To reduce the power consumption by using a power supply means where the capacity of output power rises with rising of frequency of drive pulse and determining the frequency of the drive pulse based on an indication control signal. SOLUTION: Based on the detection result of an indication load detection means 16 and an output information from a time measurement means 17, an optimized velocity determination means 18 determines a velocity in which power capacity to a power supply means 21 is made optimum value. In other words, the power supply means 21 is driven by drive pulses and as the frequency of the drive pulse rises, the capacity of output power rises and power loss becomes large. Based on the indication control signal from an indication item control means 13, the frequency of the drive pulse is determined. For example, in the case the indication load is changed from small to large, the frequency of drive pulse immediately changes from low frequency to high frequency. In this manner, since the frequency of drive pulse is changed to necessary and sufficient frequency according to the indication load, the power consumption can be reduced. |
