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1. 发明授权

US3944752A Telephone line status indicator 失效
标题翻译：电话线路状态指示灯
公开(公告)号：US3944752A
公开(公告)日：1976-03-16
申请号：US520021
申请日：1974-11-01
申请人： Theodore Stearn , Paul V. De Luca
发明人： Theodore Stearn , Paul V. De Luca
IPC分类号： H04M3/62 , H04Q3/00 , H04M3/22
CPC分类号： H04Q3/00 , H04M3/62
摘要： A device for indicating the status of one or more individual telephone lines with respect to whether the receiver is off hook or ringing without the necessity of dialing the line. A light-emitting diode and a neon lamp are positioned adjacent a discrete aperture visible to a user. The light-emitting diode responds to the presence of 24-volt normal tip line current, and is protected by a Zener diode against dial pulse currents employing ringing voltage. The neon lamp, in conjunction with a condensor carries the ringing current, and is so positioned adjacent the light-emitting diode that a glow in the neon tube is made to appear as an illumination of the light-emitting diode, whereby both bosy conditions appear to be indicated on the same light source.
摘要翻译：一种用于指示一个或多个单独电话线的状态关于接收机是否脱钩或振铃而不需要拨打该线路的设备。发光二极管和氖灯被定位成与用户可见的离散孔相邻。发光二极管响应于24伏正常尖端线电流的存在，并且由采用振铃电压的拨号脉冲电流由齐纳二极管保护。霓虹灯与冷凝器一起携带振铃电流，并且位于发光二极管附近，使得氖管中的辉光作为发光二极管的照明出现，由此出现两种波状状况被指示在相同的光源上。

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