Television interphone device
专利汇可以提供Television interphone device专利检索，专利查询，专利分析的服务。并且PURPOSE:To take a more secure measure to prevent crimes by providing an electric lock to the entrance door of a house and also by providing a master interphone unit with a lighting lamp that is turned on with an operation switch to light up a visitor. CONSTITUTION:When the push button at the entrance is depressed by a visitor, push-button switch S1 is closed to put buzzer BZ of subordinate interphone unit 4 into operation and then lighting lamp 2A of subordinate interphone unit 2 turns on to send a video signal immediately from ITV camera 2B. As a result, the image of the visitor appears on monitor television 4A. Taking a look at the visitor, a resident lifts interphone handset 4B, so that a talk to the visitor will be possible. The resident, after making sure of the visitor by the image and talk, unlocks the electric lock to let the visitor enter.，下面是Television interphone device专利的具体信息内容。
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