| 摘要 |
PURPOSE:To obtain a stable and exact electric power source, by providing an electric power source adaptor having a large capacity battery so as to be freely detachable, in a camera using electric power for various controls. CONSTITUTION:A right side circuit 1 of a 1 point chain line shows a built-in part of a camera, and a left side circuit 11 shows an electric power source adaptor which is freely detachable. In a state that the adaptor is not installed, switches SW2a and SW2b are switched to sides a1 and b1, respectively, and a low voltage driving circuit 21 and a high voltage driving circuit 22 are driven by a battery E1a, and batteries E1a and E1b, respectively. When the electric power source adaptor 11 connected with a camera by 4 terminals t1-t4 is installed, the switches SW2a and SW2b are switched to sides a2 and b2, respectively, and the low voltage circuit 21 is driven by an electric power source having a comparatively large capacity such as an alkali dry battery, and also the high voltage circuit 22 is driven through a boosting circuit 31. |
