| 摘要 |
PROBLEM TO BE SOLVED: To set an optimal power supply voltage without prolonging the start-up time of a camera.SOLUTION: A digital camera includes first, second and third power supply generation means, oscillation means the frequency of which changes depending on a voltage from the first power supply generation means, storage means for storing a target value of the oscillation means and a voltage set value of the first power supply generation means, and system control means for controlling the first, second and third power supply generation means, oscillation means and storage means, by using the power supply from the first power supply generation means and second power supply generation means as a drive power supply. When the power supply is cut off, the set value of the first power supply generation means is determined and stored in the storage means, and at the time of power supply startup, the value stored in the storage means is set in the first power supply generation means.SELECTED DRAWING: Figure 1 |
