Schnurloses Telefonsystem

摘要

A cordless telephone system is provided in which a mobile telephone set is ready to operate with a quick communication mode by distinguishing between a situation where charging voltage supply is stopped as a result of complete charging of a battery and a situation where charging voltage supply is stopped as a result of interruption of supply of power due to, for example, failure of a power source. In the cordless telephone system, a control unit 4 in the mobile telephone set 1 monitors voltages at a plus charging terminal 9 and a charging control terminal 10 of the mobile telephone set 1 and decides that the mobile telephone set 1 can operate with a quick communication mode ready for starting to originate an outgoing call or answering an incoming call when the voltages at these two terminals 9, 10 simultaneously drop when the mobile telephone set 1 is unloaded from a charging stand 12. In the event of stopping of supply of the voltage due to, for example, interruption of supply of power from an AC power supply or failure of a power supply in the charging stand 12, a minus charging terminal 15 is electrically opened earlier than a plus charging terminal 14, and a charging control terminal 13 holds a predetermined voltage for a predetermined period under control of a charging control unit 16. On the basis of the voltage held at the charging control terminal 13, the charging control unit 16 decides that the charging voltage supplying is stopped, so that the mobile telephone set is not permitted to operate with the quick communication mode. <IMAGE>