JPH08249567A - Emergency push button switch, doorphone set, and interphone system - Google Patents

Abstract

PURPOSE: To speedily report abnormality even when a push button is set at any dark place by always lighting a position confirmation lamp when it is in an operation enable state receiving the supply of power source, and outputting an alarm tone and turning on or off an alarm lamp when the push button is pressed. CONSTITUTION: When an emergency push button switch SW is set in the electrified state by receiving the supply of power source from a house information panel J or an alarm unit A, a position confirmation lamp L1 constituted with green color or the like is electrified and turned on. When any abnormality is generated and a push button B1 is depressed, the position confirmation lamp L1 is short-circuited by the push button B1, an alarm is rung by the alarm unit A, and an alarm lamp L2 composed of a red lamp is flickered. Thus, even when the push button B1 is set at any dark place, abnormality can be speedily reported and the operation of push button B1 can be discriminated at a glance.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emergency push button switch which is turned on for confirming the position when normal, and is turned on or blinks when the push button is pressed abnormally, and an intercom subunit.
Also, the present invention relates to an intercom system capable of providing a warning function by connecting a housing information panel and a doorphone subunit with a two-wire signal line.

[0002]

2. Description of the Related Art In recent intercom systems, a home information board is installed in a room to enable intercom communication with a doorphone handset installed at the entrance, etc. Etc.) is detected by various sensors and the like, an alarm is output.

In such a system, in order to notify the occurrence of a sudden illness, etc., an emergency push button switch which is connected to a house information panel and installed on a wall in a room is used. By operating this emergency push button, An alarm can be output from the room to the outside, and when a fire or the like is detected, an alarm is output from the intercom subunit.

FIG. 11 is a circuit diagram showing the configuration of the main parts of a conventional intercom system. In this system, the b side of the contact ry 'is closed during a normal call, so that the voltage V1' is supplied from the house information board J 'to the intercom subunit D'through the signal lines La' and Lc '. During such a call, the voltage V1 'varies depending on the voice waveform. Therefore, in order to stabilize the voltage to the energizing lamp L1 ′, the diode bridge DB rectifies the voltage, and further, the diode D1 ′,
The smoothing capacitor C1 'smoothes and the energizing lamp L1' is turned on.

As described above, during a normal call, the signal line L
It is possible to talk while lighting the energizing lamp L1 'by the two wires a'and Lc'. However, in order to output the warning by lighting or blinking the warning lamp L2 'at the time of warning, a signal line is further added. When Lb 'is added to make the wire 3 and the housing information panel J'outputs an alarm signal, the contact ry' of the relay Ry 'is closed at the side a and the voltage V2' (V2 '>V1') is reached.
At the same time, the contact ry is closed to supply an alarm signal to the speaker SP of the intercom sub unit D ′ to output an alarm sound. Note that in FIG. 11, R1 ′
~ R4 'is a resistor, C, C1' to C3 'are capacitors for cutting direct current, D1' to D3 'are diodes, TR'
Is a transistor, FSW is a hook switch of a handset of a home information board, SW 'is a call switch, SP, SP'
Is a speaker, MC, MC 'is a microphone, AMP, AMP'
12 are amplifiers for transmitting and talking, respectively.
(A) and (b) are V1 'and V at the time of a telephone call and an alarm.
2'shows a voltage level change (midpoint potential).

[0006]

However, in the above-mentioned conventional emergency pushbutton switch, when the installation location is dark, the position of the pushbutton may not be known and the alarm output may be delayed, and the pushbutton may be operated. Even so, I was anxious to those who suddenly became ill without being able to confirm it. In addition, even in the above conventional intercom subunit, when the installation location such as the entrance is dark, the position of the call button is difficult to understand, and even when the position confirmation light (energized light) is provided, Even if I knew the position, I couldn't know the exact position of the call button to operate, and I was sometimes confused about calling by the intercom.

Further, in the above-mentioned conventional intercom system, in order to add the function of the alarm light to the energizing light, it is necessary to make the wire between the housing information panel and the intercom subunit to be two to three or four wires. I had to do it again. The present invention has been proposed in view of the above circumstances, and the position of the push button can be known even in a dark place, and the emergency push button switch that can confirm that the push button has been pressed, the position of the call button in a dark place can be accurately known. To provide an intercom system that can provide an alarm function by connecting a doorphone subunit and a home information panel and an intercom subunit with a two-wire signal line.
Its purpose is.

[0008]

In order to achieve the above object, an emergency push button switch, a doorphone subunit and an intercom system are provided with the following means. The emergency push button switch according to claim 1 or 2 is the emergency light switch according to claim 1, which is lit or blinks when the push button is pressed, and a position which is always lit when it is in an operable state by receiving power supply. A confirmation light is provided, and in the second aspect, the emergency push button switch is configured as a grip type switch. Here, the warning light and the position confirmation light may be configured to be different in lighting color, for example, red and green.

According to the third aspect of the present invention, in the intercom sub-unit according to the third aspect, a frame-shaped position confirmation lighting portion is formed on the outline of the call button, and in the fourth aspect, the center portion of the call button. A non-light-transmitting portion is formed on the outer peripheral surface, and a frame-shaped light-transmitting portion is formed on the outer periphery thereof, and the frame-shaped light-transmitting portion is illuminated by a light-emitting source provided inside. When power is supplied from the intercom master installed in the room such as the home information panel, the frame-shaped translucent part of the button is constantly illuminated by the light source provided inside it and lights up. When an alarm signal is received, it flashes as an alarm indicator light. Here, the position confirmation lighting section and the light emitting source provided inside are configured by disposing a plurality of LED chips, LED lamps, and the like at appropriate intervals.

In the intercom system according to claims 6 to 8, the intercom system according to claim 6 includes a housing information panel and an intercom subunit.
Connected with a wire type signal line, the housing information panel is provided with a call control unit, an alarm control unit, and a control contact, each of which has a different drive power source, and the control contact is used in a normal call mode. The switching control is performed so that the driving power is supplied to the intercom subunit through the two-wire type signal line, while the switching is performed in the alarm mode so that the driving power is supplied to the intercom subunit through the two-wire signal line from the alarm control unit. It is configured to be controlled, and the intercom sub-unit is an energizing lamp that lights when drive power is supplied from the call control unit of the house information board and a drive power is supplied from the alarm control unit of the house information board. The structure is provided with a warning light that lights up.

According to another aspect of the present invention, the intercom sub-unit is provided with a voltage discriminating circuit and a flicker control circuit, and the voltage discriminating circuit lights up a warning light when drive power is supplied from the house information panel in the call mode. On the other hand, when the drive power in the alarm mode is supplied, the alarm light is made to blink. According to claim 8, the intercom sub-unit is provided with a microphone and a speaker for a call, and the speaker receives a change in current generated in a coil transformer connected to the two-wire type signal line, and the call control unit of the house information board. The microphone is connected to a two-wire signal line and rectifies the drive power that is modulated by the audio signal supplied from the call controller of the housing information panel. It is characterized by being rectified by a circuit and used as a drive power supply.

[0012]

In the emergency push button switch according to any one of claims 1 and 2, the position confirmation lamp is always lit when the power is supplied from the housing information panel or the alarm unit and the operation is possible. Therefore, when the push button is pressed, an alarm sound is output and the alarm light is turned on or blinks. As a result, even when the push button is located in a dark place, it is possible to quickly notify the abnormality and also to check at a glance whether the push button operation has been performed. In particular, according to the second aspect, since the emergency push button switch is composed of the grip type switch, it can be easily used by the sick person and the elderly.

In the intercom sub-unit according to the third aspect, when the power is supplied from the intercom master unit installed in the room such as a house information panel and the unit is in an operable state, the position confirmation lighting formed on the contour of the call button is turned on. Since the section is always lit, it can be more visually appealing, and by pressing the call button, the call chime of the intercom base unit installed in the room such as a house information board can be sounded. As a result, the intercom function can be used immediately even when the front door where the intercom subunit is installed is dark.

In the intercom subunit according to the fourth aspect, when the call button itself is in an operable state, the light emitting source provided inside is always lit, but the non-translucent portion in the center portion transmits light. Instead, since only the frame-shaped light-transmitting portion on the outer periphery transmits light, only the outline of the call button is raised, and the position of the call button is further clarified. In the intercom subunit according to claim 5, the frame-shaped translucent part of the call button is constantly turned on when power is supplied from the intercom master, but when a warning signal is received from the housing information panel, an alarm is issued. Flashes as an indicator light. At this time, an alarm sound is also output from the speaker of the intercom subunit at the same time to notify an external person that an emergency has occurred.

In the intercom system according to the sixth aspect, in the normal call mode, the control contact is switched and controlled so that the driving power is supplied from the call control unit of the housing information panel to the intercom handset. Turn on the power lamp.
In one of the alarm modes, the control contact is switched so that the alarm controller of the house information panel supplies drive power to the intercom subunit, and the alarm lamp of the intercom subunit is turned on or blinks.

In the intercom system according to the seventh aspect of the present invention, the voltage of the drive power supply is determined by the voltage determination circuit of the intercom subunit, and when the drive power supply in the call mode is supplied from the housing information panel, the voltage is passed through the flicker control circuit. While the warning light is turned on, when the driving power in the warning mode is supplied, the warning light is blinked via the flicker control circuit.

In the intercom system according to the eighth aspect, the speaker of the intercom subunit causes the coil transformer connected to the two-wire signal line to change the current to convert the call signal into sound. On the other hand, the microphone of the intercom sub-unit enables to output the sound to the house information board by rectifying the drive power that is modulated by the audio signal supplied from the call control section of the house information board by the rectifier circuit as the drive power. .

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a circuit diagram showing an example of a main part of an emergency push button switch SW according to the present invention, and FIG. 2 is a diagram showing an example of a configuration of an intercom system according to the present invention.

The intercom system shown in FIG. 2 has a house information board J and an alarm unit A installed in a room to enable an intercom call with a doorphone handset D installed at a front door or the like, and a fire generated in the room. Abnormalities such as are detected by various sensors such as the fire sensor S. Further, when a sudden illness or the like occurs in the room, the alarm unit A and the intercom subunit D are connected by operating the emergency push button switch SW connected to the house information board J and provided on the wall in the room. The alarm can be output by.

In FIG. 1, the house information board J and the emergency push button switch SW are shown in a circuit diagram. The emergency push button switch SW has a warning light L2 that blinks when the push button B1 is pressed. And a position confirmation lamp L1 which is always lit when energized in an operable state. The operation of the emergency pushbutton switch SW will be described with reference to FIG.
When the emergency push button switch SW is supplied with power from the home information board J, the alarm unit A, etc. and is in an energized state, TR1 and TR2 are turned off, and the position confirmation lamp L1 made of green or the like is energized and lit. When an abnormality occurs and the push button B1 is pressed, the position confirmation lamp L1 is short-circuited by the push button B1, an alarm is sounded by the alarm unit A, and TR3 is turned on and off, so that it is configured in red or the like. The warning light L2 blinks.

With this, even when the push button B1 is located in a dark place, the abnormality can be notified promptly, and it can be seen at a glance that the push button B1 is operated. The alarm ringing and the blinking of the warning light L2 caused by pressing the push button B1 should be stopped (turned off) by operating the stop button B (see FIG. 2) provided on the housing information board J or the alarm unit A. Can be done.

FIGS. 3A and 3B are time charts showing the operation corresponding to the configuration of FIG.
As shown in (a), when the transistors TR1, TR2, TR3 of the house information board J are turned on or off by pressing the push button B1, as shown in (b), the voltage of the lines # 1 and # 2. Is changed, and the alarm light L2 of the intercom subunit D blinks.

The emergency push button switch SW of the present invention can be configured not only as a wall-mounted switch as shown in FIG. 2 but also as a grip type switch as shown in FIG. In this configuration, the push button B1 is of an internally illuminated type, and indicates the energized state and the alarm state by a change in light color or a change in lighting and blinking. Such a switch is often used in hospital nurse call switches, etc., but it can be easily operated by sick people and the elderly.

Next, the intercom subunit D according to the present invention will be described (claims 3 to 5). FIG. 5 shows an external view thereof, and a frame-shaped position confirmation lighting section 1 is formed on the outline of the call button B2. This doorphone handset D is
When the power is supplied from the intercom base unit installed in the room such as the house information board J and in the operable state, the position confirmation lighting unit 1 is constantly lit, and the position confirmation lighting unit 1
By pressing the call button B2 on the inside of, the call chime of such an intercom base unit can be activated. With the intercom child device D, even when the entrance is dark, it can be found and pressed immediately. Such an intercom child device D
The call button B2 can be configured as shown in FIGS. 6 (a) and 6 (b).

FIG. 6A is a front view of the call button B2, and FIG. 6B is a sectional view of the call button B2. A non-light-transmitting portion 2 is formed at the center of the call button B2, and a frame-shaped light-transmitting portion 3 is formed on the outer periphery of the call button B2. The call button B2 is illuminated by a light emitting source 4 provided inside. According to such a configuration, when the call button B2 is in the operable state, the light emitting source 4 provided inside is always lit, but the non-translucent portion 2 in the central portion does not transmit light and is outside. Since only the surrounding frame-shaped light-transmitting portion 3 transmits light, the outline of the call button B2 is not too bright and the outline of the call button B2 is raised, and the position of the call button B2 becomes clear. The light emitting source 4 provided inside is configured by disposing LED chips, LED lamps, and the like at appropriate intervals and is not limited to the configuration shown in the drawing, and the light emitting source 4 may be provided in the central portion. Well, non-translucent part 2
The design of may be changed freely.

The operation of the intercom subunit D will be described. The frame-shaped translucent portion 3 of the call button B2 is always lit when power is supplied from the house information board J which is the intercom master. When an alarm signal is received from the house information board J, it flashes as an alarm indicator light. At this time, the color of the alarm indicator light may be changed, and at the same time, the alarm sound is output from the speaker of the intercom subunit D, so that it is possible to reliably notify an external person that an abnormality has occurred.

Next, the intercom system according to the present invention will be described (claims 6 to 8). FIG. 7 is a circuit diagram showing an example of a main part of the intercom system. This system is configured by connecting a house information board J and a doorphone subunit D with two-wire signal lines La and Lb. The house information board J has a call control unit 10 (drive Power supply V1 = DC6V) and alarm controller 20 (driving power supply V
2 = DC12V) and a control contact ry.

To explain the basic operation of this system, the control contact ry is switched to the call mode (closed to the b side) in the normal call mode in which the sensor S connected to the house information board J is not issuing a warning. . That is, the doorphone subunit D
Is supplied with drive power V1 from the call control unit 10 via the two-wire type signal lines La and Lb, and the energizing lamp L of the intercom sub-unit D is supplied.
3 is lit.

When the sensor S connected to the house information board J issues a warning (receives an alarm signal), the control relay ry switches the control contact ry to the alarm mode (a side closed) side.
Then, the driving power supply V2 is supplied to the intercom subunit D from the alarm control unit 20 via the two-wire signal lines La and Lb,
The alarm light L4 of the intercom subunit D lights up. Next, referring to the circuit diagram of the call amplifier 11 of the call control unit 10 of the house information board J shown in FIG. 8 and the circuit diagram of the call amplifier 31 of the intercom subunit D shown in FIG. 9, the operation will be described in more detail. explain.

The operation in the normal mode will be described. When the power is turned on, the control contact ry is switched to the normal mode side and the contact ry is closed on the b side. As a result, the call control unit 1
0 is connected to the two-line signal lines La and Lb, and the call control unit 1
The driving power V1 of 0 is supplied to the intercom subunit D through the two-wire signal lines La and Lb. Therefore, housing information board J
When the hook switch FSW is turned on by picking up the handset (not shown), the driving power source V of the call control unit 10 is generated by the voice signal output from the call amplifier 11.
1 fluctuates, and the current change generated at this time drives the coil transformer 32 of the speaker SP2 of the intercom subunit D to convert the voice signal into voice and output it.

The drive power source V1 supplied to the two-wire signal lines La and Lb at this time is rectified by the rectifier circuit 33, smoothed by the diode D1 and the capacitor C1, and becomes the power source of the transmission amplifier 31 and the microphone. The MIC2 is driven, and at the same time, the energizing lamp L3 connected in parallel with the capacitor C1 is energized and lit. Here, when the driving power supplied from the two-wire signal lines La and Lb is V1,
Since the values of the resistors Ra and Rb are set so that the transistor TR is turned off, the transistor TR is turned off and the alarm lamp L4 is not energized.

In this state, the microphone MIC of the doorphone subunit D
When a voice is input from 2, the voice signal is converted into a voice signal, and the output of the transmission amplifier 31 is changed by this voice signal to cause a change in the voltage level on the two-wire signal lines La and Lb. At this time, the voltage level is changed. Is received by the call amplifier 11 of the house information board J, and the speaker SP1 having received the output of the call amplifier 11 converts it into voice and outputs it. As shown in FIG. 8, the call amplifier 11 provided on the house information board J side is connected to the speaker SP1 and the microphone MIC1, and the transmitter amplifier 31 provided on the intercom subunit D side is shown in FIG. 9
As shown in, the transistors TR4 and TR5 amplify the audio signal, the rectifier circuit 33 (diode bridge) is connected to the midpoint of the coil transformer 32 of the speaker SP2, and the audio waveform input to the microphone MIC2 is input. It is configured to output.

The capacitor C2 provided in parallel with the calling switch 34 of the intercom sub unit D is for cutting a direct current component, and prevents an overcurrent from flowing into the coil transformer 32 of the speaker SP2, and is a two-wire type. Signal lines La and Lb
The direct current component is removed from the current supplied through the coil transformer 32, and only the alternating current component necessary for reproducing the voice is supplied to the coil transformer 32.

When the house information board J is called from the intercom subunit D, the call switch 34 of the intercom subunit D is pressed. Then, the voltage levels of the two-wire signal lines La and Lb decrease, and the decrease in voltage level at this time is detected by the call detection circuit 12 provided in the call control unit 10 of the house information board J, and the house information board is detected. In J, ring the call chime,
Notify the call.

Next, the operation in the alarm mode will be described. When the alarm signal is received from the sensor S or the like, the control contact ry switches to the alarm mode and the side a is closed. Then, the call control unit 10
Is separated from the two-wire signal lines La and Lb, and the alarm controller 20 is connected to the two-wire signal lines La and Lb. As a result, the drive power source V2 of the alarm control unit 20 is the two-wire signal line L.
a, Lb, and the driving power source V2 is the alarm amplifier 2
Since it is changed by the alarm signal supplied through 1, the current change is caused in the coil transformer 32 of the speaker SP2 of the intercom subunit D, and the alarm sound is output from the speaker SP2.

The drive power source V2 supplied to the two-wire type signal lines La and Lb at this time is rectified by the rectifier circuit 33, smoothed by the diode D1 and the capacitor C1, and becomes the power source of the transmission amplifier 31. Microphone MIC2
Drive and turn on the transistor TR at the same time,
The alarm lamp L4 connected in parallel with the capacitor C1 is energized and lit.

The operation of turning on the energizing lamp L3 and the warning lamp L4 has been described above. Next, the operation of blinking the warning lamp L4 will be described. In this case, as shown in FIG. 10, a voltage discriminating circuit 40 for discriminating the voltage levels of the driving power sources V1 and V2 supplied from the house information board J to the intercom subunit D and a warning lamp L4 are turned on or. A flicker control circuit 41 for blinking is provided.

When the house information board J is in the call mode, the voltage discriminating circuit 40 indicates that the drive power source V1 in the call mode is used.
Is supplied, the flicker control circuit 41 is set to the lighting mode, so that the warning light L4 can be turned on and can function as an energizing lamp. When the house information panel J is in the warning mode, the voltage determination circuit 40 Since the driving power V2 in the alarm mode is supplied and the flicker control circuit 41 is set to the blink mode, the alarm lamp L4 can be blinked.

[0039]

As can be understood from the above description, according to the emergency push button switch according to the first and second aspects of the present invention, the position of the push button can be known by the position confirmation light even in a dark place, so that a quick alarm is issued. Can be output. Also, since it is possible to confirm that the push button has been pressed with the warning light,
It can give a sense of security to people who are suddenly ill. Especially claim 2
Since the push button is a grip type, it can be easily operated by sick people and the elderly.

According to the intercom subunit according to the third and fourth aspects of the present invention, the position of the calling button can be accurately known even in a dark place, and the intercom calling can be avoided. Further, according to the intercom sub-unit according to the fifth aspect, the call button lights up when the call button is normal and blinks when an alarm occurs, so that the alarm output can be seen at a glance. According to the intercom system according to claims 6 to 8 of the present invention, since the housing information panel and the intercom subunit are connected by a two-wire signal line, a call function and an alarm function can be provided. To add an alarm function as in the past, it is only necessary to change the configuration of the housing information panel and intercom subunit without wiring work, and the construction cost can be reduced. In particular, according to the intercom system according to claim 7, the alarm light can be turned on in the normal state to function as the energizing lamp, and can be blinked in the case of an alarm to function as the alarm lamp. Both the function of the power lamp and the warning light can be achieved with just this.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an example of a main part of an emergency push button switch according to the present invention.

FIG. 2 is a diagram showing an example of a configuration of an intercom system including an emergency push button switch and an intercom subunit according to the present invention.

3 (a) and 3 (b) are time charts showing an example of the operation of the emergency push button switch according to the present invention.

FIG. 4 is a diagram showing an example of another configuration (grip type switch) of the emergency push button switch according to the present invention.

FIG. 5 is an external view showing an example of the intercom subunit according to the present invention.

6 (a) and 6 (b) are diagrams showing an example of the configuration of a call button of the intercom subunit according to the present invention.

FIG. 7 is a circuit diagram showing an example of a main part of an intercom system according to the present invention.

FIG. 8 is a circuit diagram showing an example of a main part (call amplifier) of a home information board.

FIG. 9 is a circuit diagram showing an example of a main part (transmission amplifier) of the intercom subunit.

FIG. 10 is a circuit diagram showing another example of the main part of the intercom subunit.

FIG. 11 is a circuit diagram showing an example of a main part of a conventional intercom system.

FIG. 12 (a) is a change in voltage level during a call,
(B) is a figure which shows the change of the voltage level at the time of an alarm.

[Explanation of symbols]

 SW ... Emergency push button switch B1 ... Push button L1 ... Position confirmation light L2 ... Alarm light D ... Intercom sub-unit B2 ... Call button 1 ... Position confirmation lighting part 2.・ ・ Non-translucent part 3 ・ ・ ・ Frame-shaped translucent part 4 ・ ・ ・ Light emitting source J ・ ・ ・ Housing information board A ・ ・ ・ Alarm unit 10 ・ ・ ・ Call control section 11 ・ ・ ・ Call amplifier 12 ・ ・-Call detection circuit 20 ... Alarm control unit 21 ... Alarm amplifier 31 ... Transmission amplifier 32 ... Coil transformer 33 ... Rectifier circuit 34 ... Call switch 40 ... Voltage discrimination circuit 41 ... Flicker control circuit ry ... Control contact Ry ... Control relay V1 ... Drive power supply (talk mode) V2 ... Drive power supply (alarm mode) L3 ... Energizing lamp L4 ... Warning lamp La, Lb ... 2-wire type signal line MIC1, MI 2 ... Mike SP1, SP2 ··· speaker

Claims (8)

[Claims] 1. An emergency push button switch which receives power from a housing information panel, an alarm unit, or the like and outputs a warning sound by pushing a push button in an emergency. A warning light that lights up or blinks when the push button is pressed. And an emergency pushbutton switch that is equipped with a position confirmation lamp that is constantly lit when it is in an operable state by receiving power supply. 2. The emergency push button switch according to claim 1, wherein the emergency push button switch is configured as a grip type switch. 3. An intercom subunit in which a frame-shaped position confirmation lighting portion is formed on the outline of the call button. 4. A non-light-transmitting portion is formed in the center of the call button, and a frame-like light-transmitting portion is formed on the outer periphery of the call button, and the frame-like light-transmitting portion is illuminated by a light source provided inside. The intercom subunit according to claim 3, which is configured. 5. The frame-shaped translucent part of the call button is always illuminated by a light source provided inside the intercom master installed in a room such as a house information board when power is supplied. The intercom subunit according to claim 3, wherein the intercom subunit is configured to light up and blink as an alarm indicator when an alarm signal is received from the housing information panel. 6. An intercom system configured by connecting a housing information panel and a doorphone subunit with a two-wire signal line, wherein the housing information panel has a call control unit with different driving power sources and an alarm control. Part and a control contact are provided, and the control contact is switched and controlled by the call control part so as to supply driving power to the intercom subunit during a normal call mode through a two-wire signal line. In the alarm mode, the alarm control unit is configured to perform switching control so as to supply driving power to the intercom subunit through the two-wire signal line, and the intercom subunit is the call control unit of the housing information panel. An intercom system having a structure including an energizing lamp that is turned on when driving power is supplied from the housing, and an alarm lamp that is turned on when driving power is supplied from the alarm control unit of the housing information panel. 7. The door phone subunit includes a voltage discriminating circuit,
A flicker control circuit is provided, and the voltage determination circuit turns on the warning light when drive power is supplied from the housing information board in the call mode, and when drive power is supplied in the alarm mode. The intercom system according to claim 6, wherein the alarm light is made to blink. 8. The intercom subunit is provided with a microphone and a speaker for talking, and the speaker receives the change in current generated in a coil transformer connected to a two-wire signal line, and the housing information board. Is adapted to convert a call signal sent from the call control unit of the above into a sound, and the above-mentioned microphone is connected to the above-mentioned two-wire type signal line, and a voice signal supplied from the call control unit of the above-mentioned housing information panel. The intercom system according to claim 6, wherein the drive power supply modulated by the above is rectified by a rectifier circuit to be a drive power supply.