| 摘要 |
PURPOSE:To always receive a clear picture image and to prevent that the preparation of a spare battery is slipped by providing a master equipment in a room with a charging means for the spare battery of a slave equipment battery and a means that displays a signal which is transmitted by radio and represents the exhausted state of the battery of the slave equipment installed at a hallway. CONSTITUTION:The image pickup information of a camera 1 is transmitted from an antenna 5 to a master equipment B side by a wireless transmission means within a slave equipment A. Also, the detecting output of a detecting means which detects that the voltage of a battery 2 in the slave equipment A is dropped under a prescribed voltage level is transmitted, same as the above, to the master equipment B from the antenna 5. The master equipment B installed in a room receives the battery exhausting signal by an antenna 11 and turns on a battery exhausting alarm lamp 7 and emits alarm sound from an alarm buzzer 8 and informs the change time of the battery. Meanwhile, a battery charging part 6 is a part where the spare battery is always charged and when a battery exhausting alarm is emitted, the battery 2 of the slave equipment A installed at the hallway can be changed instantly. |
