Battery charger and detection structure for detecting mounted compact electric apparatus

摘要

In a battery charger for charging a built-in secondary battery of a compact electric apparatus such as an electric shaver, an erroneous detection due to incomplete mounting of the compact electric apparatus on a mounting base is prevented with a simple and inexpensive configuration. A detection structure for detecting mounting of the compact electric apparatus on the mounting base comprises a charge contact member 3, a common contact member 4 and a signal contact member 5 which are electrically connected to a positive power source line 11, a negative power source line 12 and a control signal line 13 of the compact electric apparatus 1, respectively. A detection contact 5e which electrically connects the signal contact member 5 to the common contact member 4 when the compact electric apparatus 1 is not mounted on the mounting base 21 is integrally formed on the signal contact member 5. When compact electric apparatus 1 is mounted on the mounting base 21, the detection contact 5e is displaced corresponding to mounting of the compact electric apparatus 1 so that the signal contact member 5 is electrically disconnected from the common contact member 4. Thereby, it is possible to detect that the compact electric apparatus 1 is mounted on the mounting base 21.