| 摘要 |
PROBLEM TO BE SOLVED: To provide an interphone system provided with an unlock button locking function whose electronic lock can not be unlocked by an operation of an interphone master unit even though a calling operation is performed from an interphone slave unit. SOLUTION: As shown in Fig.1, the interphone master unit 2 is provided with a child lock button 24 for inhibiting unlock control by an unlock button 23 even though a calling button 16 is operated. Further, in the child locked state, when the ringing of calling tone is stopped, an image output operation of a monitor 32 is also stopped and a person coming home inputs ID information from the interphone slave unit 1, a master unit CPU 22 unlocks the child lock and performs unlock control of the electronic lock 3. COPYRIGHT: (C)2008,JPO&INPIT
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