| 摘要 |
PURPOSE:To obtain an over-discharge preventing device for preventing the over-discharge of a secondary battery and for preventing the wrong use of discharged secondary battery. CONSTITUTION:A battery housing part 1 of an electronic equipment is provided in the side surface of a main body case 2, and houses a secondary battery 3. Springs 4 are fixed to the back surface of the battery housing part 1, and the tip of a coil core 5 is exposed inside of the back surface through a window 6. A permanent magnet 9 is fitted to a part of the side surface of the secondary battery 3, which abuts on the coil core 5 when the secondary battery 3 is inserted to the battery housing part 1. When the voltage of the secondary battery 3 is lowered gradually by using an electronic equipment and achieves the cut-off voltage, magnetization of the coil core 5, which attracts the permanent magnet 9 arranged in the secondary battery 3, is reversed, and the secondary battery 3 is discharged from the battery housing part 1 by the restoring force of the springs 4. |
