| 摘要 |
PURPOSE:To prevent the control of a camera, which has plural loads and plural power sources, from malfunctioning by providing a switching means between the power sources and control circuit, and supplying electric power to the control circuit from a power source with a less voltage drop without exception. CONSTITUTION:When a motor M1 is driven, the voltage of a power source B1 drops below the minimum normal-operation securing voltage of a control circuit CC, so a transistor (TR) T2 for power source switching is turned on before the dropping and a TRT1 is turned off to switch the power source B1 to a power source B2. When a motor M2 is driven, on the other hand, the power source B2 is switched to the power source B1. The switching of the power sources for the control circuit CC is performed through control terminals OP1 and OP2 according to a prescribed program incorporated in the control circuit CC. Therefore, electric power having higher than the minimum voltage is supplied to the control circuit invariably, eliminating malfunction. |
