| 摘要 |
PROBLEM TO BE SOLVED: To reduce the weight of a radio receiver by using a bar antenna, also as a component part for a charging circuit of a secondary battery, serving as a power supply of the radio receiver. SOLUTION: A charging device 50A is connected to a commercial power supply Ps, and the lower part of a radio receiver 1A is put into a mounting part 52. A secondary charging circuit 30B is formed and is electromagnetically induced by a magnetic circuit which consists of an AC/AC converter 31 built into the device 50A, a primary coil 32, a primary magnetic core 33, an antenna coil 9 and a bar antenna 10. A high-frequency current that is electromagnetically induced is rectified by a rectifier circuit 37, and the charging of a secondary battery B is started. Thus, it is possible to reduce the weight of the receiver 1A by using the coil 9 and the antenna 10, also as the component parts of a secondary magnetic circuit. |
