JP2008085611A - Interphone master unit, interphone slave unit and interphone system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an interphone master unit capable of preventing a speech communication circuit from failing due to the application of power supply voltage to the speech communication circuit even when a power supply line is connected wrong to a speech communication line connection terminal. <P>SOLUTION: A power supply terminal V is provided in between the speech communication circuit 13 and the speech communication line terminal TA, with a speech communication path switching means 15 for switching connection on/off between the speech communication circuit 13 and the speech communication line terminal TA; and when voltage is applied to the power supply terminal V, the speech communication circuit 13 is connected to the speech communication line terminal TA. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an improvement of an interphone master unit, an interphone slave unit, and an interphone system.

  Recently, an intercom system as shown in Patent Document 1 has become widespread.

In this type of interphone system, an interphone slave unit is additionally connected to the interphone master unit. Each of the interphone master unit and the interphone slave unit has a power supply terminal and a communication line connected to a built-in call circuit. Terminal. In the interphone master unit and the interphone slave unit, a power line is connected to the power terminal, and a call line is connected to the call line terminal. The interphone master unit and the interphone slave unit are supplied with drive power supplied through the power line. When a call operation is performed in the interphone slave unit, a predetermined call is made in the interphone master unit, and when there is a response, the communication path is closed between the two and the call becomes possible.
JP 2005-31441 A

  However, in this type of conventional intercom system, each of the interphone master unit and interphone slave unit is often arranged with the telephone line connection terminal and the power supply terminal close to the back side of the device. The power line to be connected may be mistakenly connected to the telephone line connection terminal. In such a case, a power supply voltage is applied to the call circuit, and an overcurrent may occur, causing a failure.

  The present invention has been proposed to solve such a problem, and even when the power supply line is mistakenly connected to the call line connection terminal, the call circuit is prevented from being damaged due to the application of the power supply voltage. An object is to provide an interphone master unit, an interphone slave unit, and an interphone system.

  In order to achieve the above object, in the intercom master device according to claim 1 of the present invention, there is provided a speech path switching means for switching on and off the connection between the speech circuit and the speech line terminal between the speech circuit and the speech line terminal. And when a voltage is applied to the power supply terminal, the call circuit and the call line terminal are connected.

  In the interphone master device according to claim 2, the speech path switching means is constituted by a normally open relay circuit.

  4. The intercom handset according to claim 3, wherein the intercom handset includes a power terminal and a call line terminal connected to a built-in call circuit, and the call circuit and the call line terminal between the call circuit and the call line terminal. Is provided with a communication path switching means for switching on / off of the connection to the power supply terminal, and when a voltage is applied to the power supply terminal, the communication circuit and the communication line terminal are connected.

  The interphone handset according to claim 4 is characterized in that the speech path switching circuit is constituted by a normally open relay circuit.

  The interphone system according to claim 5 includes the interphone master unit according to claim 1 or 2 and the interphone slave unit according to claim 3 or 4.

  According to claim 1, in the intercom master, when a voltage is applied to the power supply terminal, the call circuit and the call line terminal are connected, so even if the power line is mistakenly connected to the call line terminal, Since no power supply voltage is applied to the call circuit, it is possible to prevent the call circuit from being broken.

  According to the second aspect, in the interphone master unit, the speech path switching circuit is configured by a normally open type relay circuit, so that the circuit configuration can be simplified.

  According to claim 3, in the intercom handset, when a voltage is applied to the power supply terminal, the call circuit and the call line terminal are connected, so even if the power line is mistakenly connected to the call line terminal, Since no power supply voltage is applied to the call circuit, it is possible to prevent the call circuit from being broken.

  According to the fourth aspect of the present invention, in the intercom handset, the speech path switching circuit is constituted by a normally open relay circuit, so that the circuit configuration can be simplified.

  According to the fifth aspect, since the interphone master unit according to the first or second aspect and the interphone slave unit according to the third or fourth aspect are configured, the effect of any one of the first to fourth aspects is achieved. An intercom system can be provided.

  Embodiments of the present invention will be described below. FIG. 4 is a system diagram showing an example of a schematic configuration of the intercom system of the present invention.

In the intercom system of the present invention, the first interphone master unit 1 is connected to the commercial AC power source 3 through the power line L1, and is driven by receiving the driving power source VO supplied from the commercial AC power source 3. .
The intercom handset 2 is connected to the first interphone handset 1 through the ground line L2, the communication line L3, and the call line L4. Further, the interphone handset 2 is connected to the power line L1, the ground line L2, and the communication. The second intercom base unit 1A is connected through the line L3 and the communication line L4. The intercom handset 2 is driven by receiving drive power from the first interphone base 1 through a power supply line (not shown).

  In addition, by connecting the commercial AC power source 3 to the interphone slave unit 2, the driving power is supplied from the interphone slave unit 2 to the second interphone master unit 1A through a power supply line (not shown), so that the second interphone master unit is connected. 1A may be driven. Further, the first interphone master unit 1 and the interphone slave unit 2 may be supplied after the drive power from the commercial AC power source 3 is once converted to DC power.

  According to the interphone system having such a configuration, if there is a call operation on the interphone slave unit 2, a call signal is transmitted to the interphone master units 1 and 1A through the communication line L3. 1, 1A performs a predetermined calling process, and if there is a response, the communication path through the communication line L4 is closed between the interphone master unit 1, 1A and the interphone master unit 2, and a call becomes possible. The manner in which the calling signal is sent to the interphone master unit 1 and 1A through the communication line L3 is not limited, and the voltage level of the drive power supplied through a power supply line (not shown) is lowered, and this is changed to the interphone master unit 1 , 1A may determine that a call signal has been sent.

  FIG. 1 is a block diagram showing an example of a main part configuration of the interphone master units 1 and 1A according to the present invention. In the figure, V is a power supply terminal for connecting the power supply line L1, G is a ground terminal for connecting the ground line L2, TB is a communication terminal for connecting the communication line L3, and TA is a communication line terminal for connecting the communication line L4.

  As shown in FIG. 1, the interphone master unit 1, 1 A includes an arithmetic processing circuit 10 that controls the following units, a response button 11 for responding to a call from the interphone slave unit 3, and an interphone slave unit 3. Is provided in order to prevent a short circuit between the power terminal V and the ground terminal G, a communication circuit 13 for performing a call using the speaker SP and the microphone MI through the notification lamp 12 for notifying the call, and the communication line L4. The resistance value is used to generate a potential difference, which is composed of a resistor 14, an electromagnetic contactor, and an electromagnetic switch through which a current for operating the speech path switching means 15 operates. A power line L1 is connected to the power terminal V, and a ground terminal G When the ground line L2 is connected to and a current from the drive power supply VO flows, the control contacts 15A and 15B are controlled to connect the communication line terminal TB and the arithmetic processing circuit 10 between the communication line terminal T and the communication line terminal T. And a speech path switching means 15 composed of a normally open relay circuit for connecting the speech circuit 13 said.

  In the interphone master units 1 and 1A having such a configuration, when the power supply line L1 is connected to the power supply terminal V and the ground line L2 is connected to the ground terminal G, the current from the drive power supply VO flows to the communication path switching means 15. The path switching means 15 closes and controls the control contacts 15A and 15B to connect between the communication line terminal TB and the arithmetic processing circuit 10 and between the call line terminal TA and the call circuit 13.

  Here, in the interphone master units 1 and 1A, the communication path switching means 15 receives and controls the current flowing due to the potential difference generated by the resistor 14, but the arithmetic processing circuit 10 is generated at the power supply terminal V. A configuration may be adopted in which a voltage is detected and a current is passed through the speech path switching means 15.

  FIG. 2 is a block diagram showing an example of the configuration of the main part of the intercom slave device 2 of the present invention.

  This intercom handset 2 controls the following units, detects the application of the drive voltage VO to the power supply terminal V, and passes the current through the speech path switching means 24 to close and control the control contacts 24A and 24B. Provided to prevent a short circuit between the circuit 20, the call button 21 for calling the interphone master unit 1, the call circuit 22 for making a call using the speaker SP and the microphone MI through the call line L4, and the arithmetic processing circuit 20. A resistor 23, an electromagnetic contactor, and an electromagnetic switch, which are controlled by the arithmetic processing circuit 20 to control the control contacts 24A and 24B, so that communication between the communication line terminal TB and the arithmetic processing circuit 20 is performed. There is provided a speech path switching means 24 composed of a normally open relay circuit that connects the line terminal TA and the speech circuit 22.

  In the interphone slave unit 2 configured as described above, when the power supply line L1 is connected to the power supply terminal V and the ground line L2 is connected to the ground terminal G, the drive power supply VO is supplied from the interphone master unit 1 and the power supply terminal V is connected. A drive voltage VO is applied. At this time, the arithmetic processing circuit 20 detects the application of the drive voltage VO to the power supply terminal V, and controls the control contacts 24A and 24B to close by controlling the communication line switching means 24 so that the communication contact terminal TB is closed. And the arithmetic processing circuit 20 and the call line terminal TA and the call circuit 24 are connected to each other.

  FIG. 3 is a block diagram showing another example of the configuration of the main part of the intercom handset of the present invention.

  In the intercom handset 2A, when the power supply line L1 is connected to the power supply terminal V and the ground line L2 is connected to the ground terminal G, the call path switching means is caused by the potential difference generated by the resistor 23 due to the current generated by the drive power supply VO. 24, the speech path switching means 24 controls the control contacts 24A and 24B to close and connect between the communication line terminal TB and the arithmetic processing circuit 20 and between the speech line terminal TA and the speech circuit 14, respectively. To do.

The block diagram which shows an example of the principal part structure of the intercom main unit of this invention The block diagram which shows an example of the principal part structure of the intercom cordless handset of this invention The block diagram which shows the other examples of the principal part structure of the intercom cordless handset of this invention System diagram showing an example of an intercom system of the present invention

Explanation of symbols

1, 1A Interphone master unit 2, 2A Interphone slave unit 13, 22 Call circuit 15, 24 Call path switching means V Power supply terminal TA Call line terminal

Claims (5)

In the intercom base unit having a power terminal and a telephone line terminal connected to a built-in telephone circuit,
Between the call circuit and the call line terminal is provided with a call path switching means for switching on and off the connection between the call circuit and the call line terminal, and when a voltage is applied to the power supply terminal, An intercom master unit comprising a telephone circuit and a telephone line terminal connected to each other. In claim 1,
The intercom base unit, wherein the communication path switching means is constituted by a normally open relay circuit. In an intercom handset comprising a power supply terminal and a call line terminal connected to a built-in call circuit,
Between the call circuit and the call line terminal is provided with a call path switching means for switching on and off the connection between the call circuit and the call line terminal, and when a voltage is applied to the power supply terminal, An intercom handset that connects a telephone circuit and the telephone line terminal. In claim 3,
The intercom handset characterized in that the speech path switching circuit comprises a normally open relay circuit.   An interphone system comprising the interphone master unit according to claim 1 or 2 and the interphone slave unit according to claim 3 or 4.

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