JP2001101554A - Telephone system for fire alarm system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a telephone system for fire alarm system which can be reduced in manufacturing cost by increasing the general usefulness of the components of the system and can suppress an increase in monitoring current even when such a state that a handset is connected to a receiver continues. SOLUTION: A telephone system 100 for fire alarm system is provided with a plurality of fire alarm terminals (transmitters) 10, such as fire alarm transmitters, indicator panels, etc., handsets (second handsets) 20 connected to the transmitters 10 through pin jacks (telephone jacks) PJ and pin plugs PP, a single fire alarm receiving board (receiver) 30 connected to the of transmitters (including those not shown in the figure) through telephone lines LT. The telephone system is also provided with a handset (first handset) 40 connected to the receiver 30 through a modular jack MJ and a modular plug MP.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a telephone apparatus for a fire alarm system, and more particularly to a telephone apparatus for a fire alarm system for making a call between a fire receiving panel and a terminal having a telephone jack.

[0002]

2. Description of the Related Art Conventionally, a fire alarm terminal (hereinafter simply referred to as a transmitter) such as a fire alarm transmitter or a display panel installed in each fire monitoring area is connected to a plurality of transmitters via telephone lines. In a fire alarm system including a single fire receiving panel (hereinafter, simply referred to as a receiver), a telephone device for making a call between a transmitter and a receiver is shown in FIG. It has a configuration as shown in FIG.

[0003] That is, as shown in FIG.
0 and a telephone jack PJ at a predetermined position of the receiver 130.
1 and PJ2 are provided, and the corresponding telephone jacks PJ1 and PJ2 are provided.
2. Pin plugs PP1 and PP of handsets 120 and 140
2 and the transmitter 110 installed in a specific fire monitoring area and the receiver 1 on the administrator side, respectively.
30 is connected by a telephone line LT and a desired call can be made. In FIG. 8, reference numeral 130A denotes an operation display panel, which includes a fire representative light, a district display window, a district display light, a speaker (or a buzzer: hereinafter, generally referred to as a speaker) SPA, a telephone light ILA, and a sound stop switch. Various switches for maintenance and a telephone jack (pin jack) PJ2 are provided inside a small door (cover) 130B provided below the operation display panel 130A.

Here, a schematic configuration of a conventional fire alarm system telephone device will be described with reference to FIG. FIG.
, The handsets 120 and 140 connected to the transmitter 110 and the receiver 130 include microphones 121 and 141 and speakers 122 and 1 for inputting and outputting voice during a call.
42, amplifier circuits 123 and 143 for amplifying an electric signal corresponding to the sound, and amplifier circuits 123 and 14
3 for transmitting the electric signal from the first and second power supply circuits and supplying power for driving the amplifier circuit.
It has substantially the same configuration including C2 and two-pole pin plugs PP1 and PP2.

The transmitter 110 is a transmitter / receiver 12 on the transmitter side.
0, and a two-core telephone line (T line, TC) corresponding to the two-core signal code LC1 of the handset 120 connected to the pin jack PJ1.
Line) LT and connected to the receiver 130.

[0006] On the other hand, the receiver 130 is a two-core telephone line LT composed of a T line and a TC line provided between the transmitter 130 and the transmitter 110.
, A transmitter-side power supply unit 131 that supplies predetermined power supply voltages VMC and GND, and a transmitter that detects whether or not a handset is connected to the transmitter based on a change in a current value flowing through the T line. The device side connection detection circuit 132, the pin jack PJ2 for connecting the handset 140 on the receiver side, and a predetermined power supply voltage to the handset 140 on the receiver side connected via the pin jack PJ2, VMC, Receiver-side power supply unit 133 for supplying GND, and receiver-side handset 1
A receiver-side connection detection circuit for detecting whether or not a handset is connected to the receiver based on a change in a current value flowing through a signal line supplied with power to the transmitter; The telephone lamp shown in FIG. 8 based on the coupling capacitor C provided between the power supply units 131 and 133 and the detection signals output from the connection detection circuits 132 and 134 on the transmitter side and the receiver side. And a control circuit (MPU) 135 for controlling the lighting of the ILA and the output of a ringing tone from the speaker SPA.

In the telephone apparatus for a fire alarm system having such a configuration, when a call from a transmitter installed in each fire monitoring area to a receiver is required, FIG.
0, the pin plug PJ1 of the transmitter 110 is firstly connected to the pin plug PJ1 of the transmitter / receiver 120.
By inserting and connecting P1, the power supply voltage V from the transmitter-side power supply unit 131 provided inside the receiver 130 is output.
MC and GND are supplied to an amplifier circuit 123 built in the handset 120 on the transmitter side via the telephone line LT.
As a result, a current flows from the high-potential power supply (VMC) side to the low-potential power supply (GND) side via the T line, the handset (amplifier circuit 123) 120, and the TC line. The connection state between the transmitter 110 and the handset 120 is detected by the detection by the circuit 132.

The control circuit 135 determines that there is a call request from the transmitter side based on the detection signal output from the transmitter side connection detection circuit 132, and provides it on the operation display panel 130A of the receiver 130. In addition to turning on the telephone light ILA, a ringing tone is output from the speaker SPA to notify the manager on the receiver side. In response to such a call from the transmitter side, as shown in FIG.
2 by inserting and connecting the pin plug PP2 of the handset 140, the power supply voltages VMC and GND from the receiver-side power supply unit 133 provided inside the receiver 130 become
Amplifier circuit 14 built in handset 140 on the receiver side
3 is supplied.

As a result, a current flows from the high-potential power supply (VMC) side to the low-potential power supply (GND) side via the handset (amplifier circuit 143) 140, and this current is detected by the receiver-side connection detection circuit 134. By detecting
The connection state between the receiver 130 and the handset 140 is detected.
In this way, each handset 12 on the transmitter side and the receiver side
0 and 140 are connected in a communicable state via the coupling capacitor C and the telephone line LT inside the receiver 130, and are controlled based on a detection signal output from the receiver-side connection detection circuit 134. The circuit 135 stops outputting the ringing tone from the speaker SPA. By a series of operation control as described above, a communication circuit is formed between the transmitter side and the receiver side, and the transmitter 110 and the receiver 130
The use of the handsets 120 and 140 connected to each other has reported the occurrence of a fire from each of the fire monitoring areas, and reported when the fire alarm system was checked.

[0010]

However, the above-described telephone device for a fire alarm system has the following problems. (1) A handset connected to a transmitter and a receiver has a built-in printed circuit board on which an amplifier circuit is mounted in addition to a speaker and a microphone, and has a dedicated two-pin pin plug and a receiver via a pin jack. , Which has a unique (exclusive) configuration of the fire alarm system, which raises the problem that the product cost of the handset increases. (2) In the circuit configuration of the fire alarm system telephone device shown in FIG. 9, when a pin plug of a handset is connected to a pin jack attached to a receiver or a transmitter,
It has a circuit configuration in which current always flows from the high potential power supply (VMC) side of the power supply unit on the transmitter side and the receiver side provided inside the receiver to the low potential power supply (GND) side via the handset. Therefore, there is a problem that, for example, if the state where the handset on the receiver side is connected is continued, the monitoring current (current consumption) of the receiver increases.

The present invention has been made in view of the above-mentioned problems, and has been made in a case where the components of the telephone device can be generalized to reduce the product cost, and the state where the handset is connected to the receiver is continued. Even if there is, an object of the present invention is to provide a fire alarm system telephone device that can suppress an increase in monitoring current.

[0012]

According to a first aspect of the present invention, there is provided a telephone apparatus for a fire alarm system, wherein a fire alarm terminal having a telephone jack and a fire receiving board are connected via a telephone line. In a telephone device for a fire alarm system for making a call between an alarm terminal and the fire receiver, a first handset connected to the fire receiver through the telephone jack provided on the fire receiver. Is built in only a speaker and a microphone, the fire receiver, the input signal from the microphone built in the first handset, and,
An amplifier circuit for amplifying an output signal to the speaker is built in. The fire alarm system telephone device according to the second aspect of the present invention is the fire alarm system telephone device according to the first embodiment, wherein the telephone jack provided on the fire receiving panel is a modular jack, The first handset includes a modular plug corresponding to the modular jack.

According to a third aspect of the present invention, there is provided a telephone apparatus for a fire alarm system according to the second aspect, wherein the first handset is provided on the fire receiving panel. The fire receiver and the handset are connected by a modular cable having a modular jack equivalent to the telephone jack and having a modular plug corresponding to the modular jack at both ends. According to a fourth aspect of the present invention, there is provided the telephone for fire alarm system according to the second or third aspect, wherein the modular jack and the modular plug are built in the first handset. A signal line for transmitting an input signal from a microphone, a signal line for transmitting an output signal to the speaker, and three or more terminal contacts connected to each of the signal lines for supplying a predetermined reference potential; It is characterized by having.

According to a fifth aspect of the present invention, there is provided a telephone apparatus for a fire alarm system according to any one of the first to fourth aspects, wherein the fire receiving board is provided in the fire alarm terminal. Through the provided telephone jack, via a terminal-side connection detection circuit that detects that a dedicated second handset is connected to the fire alarm terminal, and via the telephone jack provided in the fire receiving board A board-side connection detecting circuit for detecting that the first handset is connected to the fire receiving board; and detecting the terminal-side connection when the second handset is connected to the fire alarm terminal. And a switch circuit that controls switching based on a detection signal output from the circuit to supply power to the amplifier circuit and the board-side connection detection circuit.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a fire alarm system telephone device according to the present invention will be described below with reference to the drawings. FIG. 1 is an external configuration diagram showing an embodiment of a telephone device for a fire alarm system according to the present invention.
1 is an internal configuration diagram showing an embodiment of a telephone device for a fire alarm system according to the present invention. Here, the same components as those of the above-described conventional technology will be described with the same reference numerals.

As shown in FIG. 1, a telephone 100 for a fire alarm system includes a fire alarm terminal (transmitter) 10 such as a fire alarm transmitter and a display panel, and a pin jack (telephone jack) PJ for the transmitter 10. A handset (second handset) 20 connected via pin plug PP, and a single fire receiver connected to a plurality of transmitters (including those not shown) 10 via telephone line LT (A receiver) 30 and a handset (first handset) 40 connected to the receiver 30 via a modular jack MJ and a modular plug MP. In addition, actually, the fire receiving board 30
A plurality of fire alarm terminals 1 for the telephone line LT
0 will be connected.

Hereinafter, each configuration will be described with reference to FIGS. 1 and 2. The transmitter 10 is provided in each fire monitoring area, and includes a pin jack PJ for connecting a dedicated handset 20 in addition to the original fire alarm function unit.
The transmitter / receiver 20 on the transmitter side includes a microphone 21 and a speaker 22 for inputting / outputting a voice and an amplifier circuit 23 for amplifying an electric signal corresponding to the voice, as in the case of the related art. And a two-core signal cord LC and a two-pole pin plug PP for transmitting an electric signal from the amplifier circuit 23 and supplying power for driving the amplifier circuit. The transmitter 10 is connected to the receiver 30 via a two-core telephone line (T line, TC line) LT corresponding to the two-core signal code LC of the handset 20 connected to the pin jack PJ. ing.

The receiver 30 includes a predetermined power supply voltage Vin on each of the two-core telephone line LT including a T line and a TC line provided between the transmitter 30 and the original fire monitoring function unit. ,
A power supply (Vin, GND) that constantly applies GND, and a power supply (Vin) provided between the power supply (Vin) and the T line, and whether or not the handset 20 is connected to the transmitter 10 based on a change in a current value flowing through the T line. Transmitter-side connection detection circuit (terminal-side connection detection circuit) 31, a modular jack MJ for connecting the receiver-side handset 40, and a microphone 41 built in the receiver-side handset 40. And an amplifier circuit 32 for amplifying an electric signal corresponding to sound input / output via the speaker 42, and a receiver for detecting whether the handset 40 is connected to the receiver 30 via the modular jack MJ. The power supply (VMC) is supplied to the amplifier circuit 32 and the receiver-side connection detection circuit 33 based on the detection signal output from the side-connection detection circuit (panel-side connection detection circuit) 33 and the transmitter-side connection detection circuit 31. Switch circuit 34 for controlling feeding
And the operation display panel 30 based on the detection signals output from the connection detection circuits 31 and 33 on the transmitter side and the receiver side.
And a control circuit (MPU) 35 for controlling the lighting of the telephone light IL and the output of a ringing tone from the speaker (or buzzer) SP.

The transmitter / receiver 40 on the receiver side transmits a microphone 41 and a speaker 42 for inputting and outputting audio, and an electric signal corresponding to the input and output audio.
A four-core modular cable MC for supplying the ground potential GND to the microphone 41 and the speaker 42 and a four-pole modular plug MP are provided. That is, the transmitter-side connection detection circuit 31 is always supplied with power (Vin),
The connection state between the transmitter 10 and the transmitter / receiver 20 on the transmitter side is constantly monitored. On the other hand, a detection signal output from the transmitter side connection detection circuit 31 is output to the receiver side connection detection circuit 33 by the transmitter 10. Only when the signal indicates that the handset 20 is connected, the switching circuit 34 is controlled to be switched, and the power supply VMC (Vin) is supplied.

Next, a receiver applied to the fire alarm system telephone apparatus having the above-described configuration will be described with reference to the drawings. FIG. 3 is a schematic diagram illustrating an example of an operation display panel of a fire receiving panel (receiver) applied to the fire alarm system telephone device according to the present embodiment. FIG.
In the operation display panel 30A of the fire receiving panel shown in FIG. 7, the fire representative light 30a blinks when there is an alarm from the transmitter 10 or the fire detector provided in each fire monitoring area. Also, a plurality of district representative lights 30b are provided corresponding to the districts, and when a transmitter or a fire detector is issued, the corresponding district indicator light 30b flashes.

The main operation section 30c includes various indicators such as a power indicator and various operation switches. In particular, when a telephone call is made from the transmitter 10, the telephone light IL is turned on, and the speaker SP rings and the ringing tone sounds. Is output. Note that the sound stop switch SA is pressed when the ringing sound from the speaker SP is to be stopped arbitrarily. The maintenance operation unit 30d
It is equipped with various operation switches and a telephone jack MJ used for maintenance and inspection work, and usually has a small door (cover) shown in FIG.
It is protected by 30B so that it cannot be directly contacted with the operation switches. Here, phone jack M
As described above, J has a 4-core modular jack for supplying input / output signals to and from the microphone 41 and the speaker 42 built in the handset 40 on the receiver side, and the ground potential GND.

Next, the operation control in the telephone apparatus for a fire alarm system having the above-described configuration will be described in detail with reference to the drawings. FIG. 4 is a conceptual diagram illustrating a telephone call state in the fire alarm system telephone device according to the present embodiment, and FIG. 5 is a conceptual diagram illustrating a call response state in the fire alarm system telephone device according to the present embodiment. FIG. 6 is a conceptual diagram showing a handset connection continuation state in the fire alarm system telephone device according to the present embodiment. In the telephone apparatus for a fire alarm system having the above-described configuration, first, a case where a call is made from a transmitter installed in each fire monitoring area to a receiver will be described with reference to FIGS. . Here,
Description will be made with reference to the internal configuration shown in FIG. 2 and the operation display panel shown in FIG. 3 as necessary.

As shown in FIG. 4, first, a pin jack PP of the transmitter 10 is provided inside the receiver 30 by inserting and connecting a pin plug PP of the transmitter / receiver 20 dedicated to the transmitter. From power supply to power supply voltage Vi
n, GND are supplied to the handset 20 connected to the transmitter 10 via the telephone line LT. As a result, current flows from the high-potential power supply (Vin) to the low-potential power supply (GND) via the transmitter connection detection circuit 31, the T line, the transmitter / receiver (amplifier circuit 23) 20, and the TC line. Therefore, by detecting this current by the transmitter-side connection detection circuit 31, the connection state between the transmitter 10 and the handset 20 is detected.

The detection signal output from the transmitter connection detection circuit 31 and indicating the connection state between the transmitter 10 and the handset 20 is output to the switch circuit 34 and the control circuit 35. The switching circuit 34 is turned on based on the detection signal, and supplies the power supply voltage Vin as the power supply VMC to the receiver-side amplifier circuit 32 and the receiver-side connection detection circuit 33 incorporated in the receiver. As a result, the amplifier circuit 32 and the receiver-side connection detection circuit 33 enter a drivable state. On the other hand, the control circuit 35 includes the transmitter-side connection detection circuit 3
It is determined that there is a call request from the transmitter on the basis of the detection signal output from 1 and the telephone light IL provided on the operation display panel 30A of the receiver 30 is turned on and called from the speaker SP. Outputs a sound and notifies the administrator on the receiver side.

In response to such a call from the transmitter side, as shown in FIG. 5, the administrator inserts the modular plug MJ of the receiver 30 into the modular jack MJ of the receiver 30. By inserting and connecting the MP, the transmitter / receiver 20 on the transmitter side and the transmitter / receiver 40 on the receiver side are connected via the telephone line LT and the coupling capacitor C inside the receiver 30 in a communicable state. The amplifier circuit 32 amplifies an electric signal corresponding to voice input / output via a microphone 41 and a speaker 42 built in the handset 40 on the receiver side, and transmits the amplified signal to the handset 40. At this time, the receiver side connection detection circuit 3
3, the connection state between the receiver 30 and the handset 40 is detected by detecting the current flowing from the amplifier circuit 32 via the handset 40. Specifically, a current flows from the amplifier circuit 32 to the GND on the receiver side via the microphone 41 of the handset 40, and the receiver-side connection detection circuit 33 detects this current, so that the receiver 30 The connection state of the handset 40 is detected.

A detection signal output from the receiver-side connection detection circuit 33 and indicating the connection state between the receiver 30 and the handset 40 is output to the control circuit 35, and the control circuit 35 It is determined that a communication circuit has been formed between the transmitter and the receiver, and the ringing tone output from the speaker SP of the receiver 30 is stopped. In this way, the transmitters and receivers 20, 40 on the transmitter and receiver sides
Is connected in a communicable state via the telephone line LT, and is used for reporting the state of occurrence of a fire from each fire monitoring area, communicating when checking the fire alarm system, and the like.

Next, in the operation control described above,
A case where the state where the handset 40 is still connected to the receiver 30 is continued will be described with reference to FIG.
Here, the description will be given with reference to the internal configuration shown in FIG. 2 and the operation display panel shown in FIG. 3 as necessary. As shown in FIG. 5, the pin plug PP of the handset 20 is connected to the pin jack PJ of the transmitter 10, and the modular plug MP of the handset 40 is connected to the modular jack MJ of the receiver 30. In the state (1), the power supply voltage VMC is constantly supplied from the power supply (Vin) to the amplifier circuit 32 and the receiver-side connection detection circuit 33, so that the monitoring current of the receiver 30 increases.

Then, by extracting the pin plug PP of the handset 20 connected to the pin jack PJ of the transmitter 10, the transmitter side connection detection circuit 31, the T line, the transmission line from the high potential power supply (Vin) of the receiver 30. Handset 20 on the machine side,
Since the current flowing to the low-potential power supply (GND) via the TC line is cut off, the disconnection state between the transmitter 10 and the handset 20 is detected by the transmitter-side connection detection circuit 31.
Then, a detection signal indicating this disconnection state is output from the transmitter-side connection detection circuit 31 to the switch circuit 34, whereby the switch circuit 34 operates to turn OFF and the receiver-side amplifier circuit 32 and the receiver-side connection The supply of the power supply voltage VMC to the detection circuit 33 is cut off. The amplifier circuit 32 and the receiver-side connection detection circuit 33 are in a drive stop state in response to the cutoff of the supply of the power supply voltage VMC, and current consumption is prevented even when the handset 40 is connected to the receiver 30. You.

When a call request is made again from the transmitter 10 (including a call request from a transmitter installed in another fire monitoring area), the pin jack PJ of the transmitter 10 is
By inserting and connecting the pin plug PP of the handset 20, the high-potential power supply (Vin) of the receiver 30 is used to detect the transmitter-side connection detection circuit 31, the T line, and the transmitter / receiver 20, T on the transmitter side.
Since a current flows to the low potential power supply (GND) via the line C, the connection state between the transmitter 10 and the handset 20 is detected by the transmitter side connection detection circuit 31, and the amplifier circuit 32 and the receiver side connection are detected. The power supply voltage VMC is supplied to the detection circuit 33, so that a talkable state is realized.

Therefore, the handset 40 connected to the receiver 30 incorporates only the microphone 41 and the speaker 42, and has input / output lines for the microphone 41 and the speaker 42, and four poles (supplying the ground potential GND). Assuming that the ground potential GND is common, a general-purpose modular plug MP having a terminal contact of 3 poles can be applied to a general telephone,
A handset having a general-purpose and simple configuration can be adopted, compared to a conventional configuration employing a dedicated handset,
The product cost of the telephone device for the fire alarm system can be reduced.

Further, even when the state where the handset 40 is connected to the receiver 30 is continued, the handset 20 connected to the transmitter 10 is pulled out (disconnected state) or the call is transmitted. If the handset 20 is not connected to the device 10, the power supply to the amplifier circuit 32 on the receiver side and the connection detection circuit 33 on the receiver side can be cut off and the driving can be stopped. A handset is connected to both receivers, and except when a communication line is formed, current can be prevented from flowing down to a circuit in the receiver,
The power consumption can be reduced by reducing the monitoring current of the receiver.

Next, another embodiment of the telephone apparatus for a fire alarm system according to the present invention will be described with reference to the drawings. FIG. 7 is an external configuration diagram showing another embodiment of the telephone device for a fire alarm system according to the present invention. here,
The same components as those in the above-described embodiment will be described with the same reference numerals. As shown in FIG. 7, the telephone device for a fire alarm system according to the present embodiment is characterized in that a handset 40 connected to a receiver 30 has a configuration in which a modular cable MC can be attached and detached. .

That is, the handset 40 has a modular jack MJ2 having the same configuration as the modular jack MJ1 provided in the receiver 30, and the modular cable MC has a modular plug MP1 having the same configuration at both ends. , MP2 are attached. The receiver 30 and the handset 40 are interconnected via such a modular cable MC. Therefore, in the telephone device for a fire alarm system having such a configuration, the modular cable MC and the handset 40 connected to the receiver 30 can be realized by a general-purpose and simple configuration for a general telephone. ,
Modular cable MC alone or handset 40
Even when a single body is damaged, a replacement can be obtained very easily and at low cost.

[0034]

According to the first aspect of the present invention, the handset connected via the telephone jack provided on the fire receiver has only a built-in speaker and a microphone, and the fire receiver has a handset. A built-in amplifier circuit for amplifying input / output signals from a microphone and a speaker built in, eliminates the need to incorporate a printed circuit board on which the amplifier circuit is mounted in the handset, and simplifies the assembly process. Thus, the total cost of the telephone device for the fire alarm system can be reduced.

According to the second or fourth aspect of the present invention, a modular jack and a modular plug are used as connection terminals for connecting the fire receiver and the handset, or the modular jack and the modular plug are used. A terminal contact structure of at least three poles, comprising two signal lines for transmitting input / output signals from a microphone and a speaker built in the handset, and a signal line for supplying a predetermined reference potential. Therefore, it is possible to apply a handset and a modular cable for general telephones that have a general-purpose and simple configuration, and the product cost of a telephone device for a fire alarm system is lower than that of a conventional configuration using a dedicated handset. Can be reduced.

According to the third aspect of the present invention, the handset connected to the fire receiver has a modular jack equivalent to the fire receiver, and the fire receiver and the handset are
Since it is connected by a modular cable equipped with a modular plug corresponding to the modular jack at both ends,
Even if the modular cable alone or the handset is damaged, general-purpose products for general telephones can be easily and inexpensively obtained and dealt with.

According to the fifth aspect of the present invention, the fire receiving board has a terminal-side connection detecting circuit for detecting that the handset is connected to the fire alarm terminal, and the handset is connected to the fire receiving board. And an amplifier for a handset connected to the fire receiving board based on a detection signal output from the terminal connection detection circuit when the handset is connected to the fire alarm terminal. Circuit and a switch circuit for supplying power to the board side connection detection circuit, so that the handset is connected to the fire alarm terminal even when the handset remains connected to the fire receiving board. If not, the power supply to the amplifier circuit and the board-side connection detection circuit can be cut off to stop driving, and the monitoring current of the fire receiving board can be reduced to reduce power consumption.

[Brief description of the drawings]

FIG. 1 is an external configuration diagram illustrating an embodiment of a telephone device for a fire alarm system according to the present invention.

FIG. 2 is an internal configuration diagram showing an embodiment of a telephone device for a fire alarm system according to the present invention.

FIG. 3 is a schematic diagram showing an example of an operation display panel of a fire receiving panel applied to the fire alarm system telephone device according to one embodiment.

FIG. 4 is a conceptual diagram showing a telephone calling state in the fire alarm system telephone device according to the embodiment.

FIG. 5 is a conceptual diagram showing a call response state in the telephone device for a fire alarm system according to one embodiment.

FIG. 6 is a conceptual diagram showing a handset connection continuation state in the fire alarm system telephone device according to the embodiment;

FIG. 7 is an external configuration diagram showing another embodiment of the fire alarm system telephone device according to the present invention.

FIG. 8 is an external configuration diagram showing a conventional telephone device for a fire alarm system.

FIG. 9 is a schematic diagram showing an internal configuration of a conventional telephone device for a fire alarm system.

FIG. 10 is a conceptual diagram showing a telephone call state in a conventional fire alarm system telephone device.

FIG. 11 is a conceptual diagram showing a call response state in a conventional telephone device for a fire alarm system.

[Explanation of symbols]

Reference Signs List 10 transmitter (fire alarm terminal) 20 transmitter / receiver 21/41 microphone 22, 42 speaker 23/32 amplifier circuit 30 receiver (fire receiver) 30A operation display panel 31 transmitter side connection detection circuit (terminal side connection) Detection circuit) 33 Receiver side connection detection circuit (panel side connection detection circuit) 34 Switching circuit 35 Control circuit (MPU) 40 Receiver side handset 100 Telephone device for fire alarm system

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H04M 1/738 H04M 1/738 11/04 11/04 (72) Inventor Hideki Matsumoto Kami-Osaki, Shinagawa-ku, Tokyo 2-10-43 Ho Chiki Co., Ltd. (72) Inventor Mitsuhiro Kurimoto 2-10-43 Kamiosaki, Shinagawa-ku, Tokyo F-term (reference) 5C087 AA12 AA23 AA37 AA42 AA44 BB06 DD04 DD20 EE10 EE11 FF01 FF05 FF12 FF23 GG57 GG67 GG73 GG74 5G405 AA02 AA06 BA04 CA17 CA19 CA25 CA54 DA11 DA13 DA17 DA21 EA08 FA12 5K027 AA06 BB15 BB17 DD11 DD14 HH26 KK07 5K101 KK14 NN31 NN36NN37

Claims (5)

[Claims] 1. A fire alarm system telephone device for connecting a fire alarm terminal and a fire receiving panel each having a telephone jack to each other via a telephone line and making a call between the fire alarm terminal and the fire receiving panel. In the first handset connected to the fire receiving board via the telephone jack provided on the fire receiving board, only a speaker and a microphone are built in, and the fire receiving board is the first A telephone device for a fire alarm system, comprising an amplifier circuit for amplifying an input signal from the microphone and an output signal to the speaker built in the handset. 2. The telephone jack provided on the fire receiving board is a modular jack, and the first handset has a modular plug corresponding to the modular jack. 2. The telephone device for a fire alarm system according to 1. 3. The first handset includes a modular jack equivalent to the telephone jack provided on the fire receiving panel, and a modular cable having a modular plug corresponding to the modular jack at both ends is provided. The telephone device for a fire alarm system according to claim 2, wherein a fire receiving panel and the handset are connected. 4. The modular jack and the modular plug include a signal line for transmitting an input signal from the microphone built in the first handset, a signal line for transmitting an output signal to the speaker, 4. The telephone device for a fire alarm system according to claim 2, further comprising three or more terminal contacts connected to each of the signal lines supplying the reference potential. 5. The fire receiving board, via the telephone jack provided in the fire alarm terminal,
A terminal-side connection detection circuit for detecting that a dedicated second handset is connected to the fire alarm terminal; and a first terminal connected to the fire reception panel via the telephone jack provided on the fire reception panel. A board-side connection detection circuit that detects that the handset of the second handset is connected, and when the second handset is connected to the fire alarm terminal,
A switch circuit that controls switching based on a detection signal output from the terminal-side connection detection circuit to supply power to the amplifier circuit and the board-side connection detection circuit. Item 5. The telephone device for a fire alarm system according to any one of Items 1 to 4.