JP3225070B2 - Communication device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication device, and more particularly to a communication device connected to a telephone line.

[0002]

2. Description of the Related Art Conventionally, communication devices such as facsimile machines, telephones, data terminals and the like have been known in which a memory card can be mounted as a medium for storing identification information, calling information, and the like.

In such an apparatus, a power supply unit for supplying power from a commercial power supply is used for control using a memory card. Usually, a memory card is connected while the power is turned on. Have been. Therefore, before the memory card is inserted, the commercial power supply to the power supply unit is manually turned on, or the commercial power supply to the power supply unit is always turned on in the standby state.

[0004]

However, in the above-mentioned conventional example, the power must be always turned on even when the memory card is not connected, for example, even in a standby state, and energy saving and durability of parts are required. There was a problem. Turning on the power switch manually is troublesome and inconvenient in terms of operability.

Further, when a commercial power supply cannot be obtained at the time of a power failure or the like, it has been impossible to connect and use a memory card.

SUMMARY OF THE INVENTION The object of the present invention is to solve the above-mentioned problems, to perform control in a standby state without supplying a commercial power supply, and to be able to connect and use an externally connected device such as a memory card in a non-powered state. Is to provide.

[0007]

In order to solve the above-mentioned problems, according to the present invention, in a communication device connected to a telephone line, power supply means for supplying a predetermined power supply voltage obtained from a commercial power supply to each unit of the device. when a first light emitting means for said telephone line is connected to the telephone line so as to emit light by the DC current flowing through the telephone line when the DC閉結, before
Before emitting light by an AC signal flowing through the telephone line
A second light-emitting means connected to the telephone line ;
Voltage generating means optically coupled to the light emitting means and the second light emitting means, receiving the light from the first and second light emitting means to generate a voltage, and the power supply by the voltage generated by the voltage generating means A configuration (invention 1) having activation means for activating the power supply of the means is adopted. There
In the communication device, which is connected to the telephone line, various units
Power supply means for supplying a predetermined power supply voltage obtained from a commercial power supply to the power supply
And when the telephone line is DC closed,
In order to emit light by the flowing DC current,
A connected light emitting means, the voltage receiving light of said light emitting means
A voltage generating means for generating a calling by the voltage generating means
The power supply voltage supply of the power supply means is started by the generated voltage.
Activating means and a removable external device are mounted
When, and a DC閉結means for閉結the telephone line before
The light emitting means is connected to the telephone line by the DC closing means.
By the DC current flowing through the telephone line when closed
Emits light, whereby the light emitting means, the voltage generating means and
And supply of power supply voltage of the power supply means via the activation means
(Claim 2). Alternatively,
In the communication device connected to a telephone line, commercial on each section of the device
A power supply means for supplying a predetermined power supply voltage obtained from the power source, before
The telephone line flows to the telephone line when DC connection is closed
It is connected to the telephone line so as to emitting light by direct current
Light emitting means which, generates a voltage by receiving the light of said light emitting means
A voltage generating means for, generated by said voltage generating means
Power supply of the power supply means is started by the applied voltage.
When the activation means and the detachable external device are attached,
The voltage generated by the voltage generating means receiving the light of the light emitting means.
Supply means for supplying a supplied voltage to the external device.
The configuration (claim 3) is employed.

[0008]

[Action] Among the above, according to the first aspect, the first light emitting means emitting the direct current flowing in the telephone line when the telephone line is DC 閉結, or the telephone times
The second light emission by an alternating current such as a ringing signal flowing through the line
Means emits light, and the voltage generating means outputs the first or second voltage .
In response to the light from the light emitting means, a voltage is generated, and the activating means activates the power supply of the power supply means by the voltage generated by the voltage generating means. By closing the line with DC , or exchanging a call signal or the like flowing through the telephone line.
The supply of the power supply voltage can be started by using the flowing current . According to the second aspect of the present invention, a detachable external device is provided.
The telephone line is DC-closed by installing
The light emitting means, the voltage generating means, and the starting means
Activating the power supply of said power supply means via a stage,
Can be started. Further, according to the configuration of claim 3
For example, when a detachable external device is attached,
A voltage generated by the voltage generating means receiving the light of the stage
Is supplied to the external device, and the direct current flowing through the line
The external device can be operated and used for communication
You.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

[First Embodiment] FIG. 1 shows the structure of a communication apparatus employing the present invention. In the figure, reference numerals 1 and 21 denote hook switches that are switched by turning on / off a handset, and a hook switch SW2 is an electromagnetic relay (RL1).
Consists of Reference numeral 3 denotes a diode bridge that makes the telephone line have a single polarity, and 4 denotes an LE that emits light by line current.
D, 5 are resistors for limiting the current flowing to the LED, 6 is a Zener diode for extracting a constant voltage from the line voltage, 7 is a resistor for limiting the current of the Zener diode, 8 is a numeric keypad, or information stored in the memory card 14, etc. It is a dialer IC that generates a dial signal in response.

Reference numeral 9 denotes a photovoltaic diode array (or a solar cell) that forms a photocoupler together with the diode 4 and receives light from the diode 4 to generate a voltage. Reference numeral 10 denotes a resistor that generates a detection voltage at both ends of the photocoupler.

Reference numerals 11 and 12 denote switches (SW1 and SW2) for turning on contacts when a card is loaded, 13 is a contact for supplying power to the card, 14 is a detachable external connection device, 15 and 16 are switching diodes, 17 is an electromagnetic relay (RL2) for turning on the commercial power, 18 is a manual switch for turning on the commercial power, 19 is a switching power supply, etc., and is a power supply unit (PSU) for supplying the power supply voltage Vcc to the device by the commercial power from the AC line. ), 2
Reference numeral 0 denotes a main control unit including a microprocessor or the like for controlling each unit, reference numeral 21 denotes a reverse-phase switch (normally closed type) interlocked with the hook switch 1, and reference numeral 22 denotes a switch for switching power to the card between Vcc and line power. (Electromagnetic relay). Although not shown in the above description, it is assumed that a communication circuit (not shown) such as a facsimile unit or a handset (handset) is mounted on the lines L1 and L2.

Next, the operation of the above configuration will be described.

In the present embodiment, when starting a communication operation such as a calling operation by a memory card, the secondary circuit is insulated from the DC power supply while focusing on closing the DC of the telephone line. A commercial power supply is started up by providing a means for controlling the power supply unit by generating a DC voltage.

When the handset is used at the same time, such as during a telephone call, similarly, the off-hook of the handset causes
Automatically start commercial power.

Further, when the power supply is unnecessary, such as when the memory card is removed, the AC line is automatically opened to turn off the commercial power supply.

When a commercial power source cannot be obtained, such as during a power outage, the memory card is operated by directly supplying power to the memory card using the electromotive force.

Hereinafter, the above control will be described in detail. FIG. 2 is a flowchart showing the above control, and the right part of the figure shows the contact state of each switch and relay in the two steps on the left.

First, in step S1 of FIG. 2, it is checked whether the AC input is in a power failure state. If the power is on, the process proceeds to step S2, and if the power is on, the process proceeds to step S6.

In this case, the AC power supply is automatically started from a no-power state by inserting / removing the card and turning on / off the handset, and the power supply is backed up by the office power supply in case of a power failure. Step S2 and subsequent steps will be described below (note that, in the circuits shown in FIG. 3 and subsequent figures, the contacts indicated by thick black lines are in the on state, and the others are in the off state).

[0021] <Step S2> powered state, as shown in FIG. 3, a relay 2 (RL
1) ON, relay 17 (RL2) , hook switch S
When the card is set in a state where W1 is off, the switch SW1 is turned on, the DC circuit is closed, and the diode 4 emits light. This light is received by the photovoltaic diode array 9, and a voltage is generated across the resistor 10. The relay 17 is turned on at this voltage, the AC line is closed, and V
Start cc.

When the power supply voltage Vcc rises, the relay 17 is automatically switched by the diode 16 via the switch 12 so as to be driven at the power supply voltage Vcc.

At the same time, the relay 2 is turned off and the DC circuit is opened. Further, the relay 22 is switched to the A side, and the power supply voltage Vcc is supplied to the card.

<Step S3> Next, as shown in FIG. 4, the hook switch 1 that goes off-hook in this state is turned on, the DC circuit is closed, and station power is supplied to the dialer 8 via the bridge diode 3. . Thereby, dialing using the memory card 14 and the dialer 8 becomes possible.

<Step S4> After the communication is completed, the memory card 14 is taken out by putting a handset (not shown) or the like (on-hook).

As a result, as shown in FIG.
2 is turned off, the power supply to the relay 17 is stopped, the relay 17 is turned off, the AC line is opened, and the supply of the power supply voltage Vcc by the power supply unit 19 is stopped.

When the power supply voltage Vcc is turned off, the relay 2
Turns on to prepare for the next card set. The relay 22 switches to the B side.

<Step S5> As shown in FIG. 6, when the hook is turned off and the hook switch 1 is turned on , the DC circuit is closed and the diode 4 emits light. As a result, the relay 17 is turned on as described above,
The power supply voltage Vcc rises (at this time, the relay 2 is turned off).

Further, the relay RL3 switches to the A side,
The power supply voltage Vcc is supplied to the card to enable dialing.

<Step S10> In this state, when the handset is put again, the hook switch 1 is turned off, so that the relay 17 is turned off and the AC line is opened.
The power supply voltage Vcc is turned off. The relay 22 switches to the B side.

Here, the operation at the time of a power failure after step S6 will be described.

<Step S6> As shown in FIG.
Is turned on, the relay 17 and the hook switch 1 are turned off, and the card is set in a state where the relay 22 is on the B side.

As a result, the switch 11 is turned on,
The DC circuit is closed, the diode 4 emits light, and the photovoltaic
When the ion array 9 receives light, a detection voltage is generated across the resistor 10.

At this time, since the relay 22 is on the B side, the power generated by the resistor 10 is supplied to the card.

As a result, it is possible to quickly perform a call operation using the memory card 14, and even when a power failure occurs,
Communication using the dialer 8 and the memory card 14 becomes possible.

[0036] <Step S7> Then, as shown in FIG. 8, the off-hook (hook switch 1
When the hook switch 21 is turned off and the hook switch 21 is turned off), the hook switch 21 is turned off, so that the closed DC loop is opened by inserting the memory card 14 as described above, and a call using the handset becomes possible. For example,
When a handset (not shown) has a numeric keypad, it can be used to make a call.

[0037] <Step S8> Furthermore, hang up the handset (on-hook), is taken out of the memory card 14, by which, the hook switch 1 as shown in FIG. 9 is turned off, the DC circuit is opened, photoelectromotive
The power generated by the photodiode array 9 and the resistor 10 is cut off, and the memory card 14 is turned off.

[0038] <Step S9> Further, as shown in FIG. 10, when off-hook, hook switch 21 is turned off, the DC circuit is閉結. At this time, although there is no memory card 14, a call can be made and a call can be made with the handset.

<Step S10> In this state, if the handset is put again, the hook switch
1 is turned off, and the DC circuit is opened.

According to the above embodiment, when the card is used, the DC of the line is closed for a moment by the mounting operation of the memory card 14, a voltage is generated, and the commercial power can be turned on using the voltage as a trigger. Therefore, the power can be automatically turned on only when the card is used.

After the power is turned on, the own power supply
Since the circuit operates, there is no need to maintain a direct current.

Further, even when the handset is off-hook as in the case of a conventional telephone call, it is possible to turn on the commercial power by using the line telephone as a trigger by the same operation. In the standby state, no power is required at all. It is very advantageous in terms of energy saving and reliability. The power off timing
It is excellent in operability because it can be done by attaching and detaching cards and on-hook operation.

As described above, according to this embodiment, it is possible to easily and inexpensively realize a communication device having a non-power standby power supply device which does not require any power during standby, and furthermore, the power supply is turned on / off by triggering the station power. Can be done automatically.

In the above, the memory card 14 has been exemplified, but a detachable external connection device such as a magnetic card or a magnetic disk may be used instead of the memory card 14. In the above embodiment, the power is supplied from the main body to the card. However, the same control can be performed even when the card has a built-in battery (such as a dry battery or a rechargeable battery).

In the above description, the AC line is closed using an electromagnetic relay when the commercial power is turned on. However, the FET or the like that controls the oscillation circuit of the power supply unit is controlled by the secondary voltage, or The power may be turned on using an analog switch or the like. Although the basic communication function of the apparatus has not been described in detail, the above configuration can be applied to various communication apparatuses such as a telephone, a facsimile apparatus, and a data terminal.

[Second Embodiment] In the above embodiment, the photovoltaic diode array 9 generates a trigger voltage for starting the power supply in accordance with the DC component of the line. In the present embodiment, however, according to the AC component of the line. Thus, a trigger voltage for power supply start can be generated. As a result, in the case of reception or the like, the power can be activated by a call signal.

In this embodiment, the AC line is opened when no power is required, such as when the memory card 14 is removed.

Further, when a commercial power supply cannot be obtained, for example, during a power outage, power is supplied directly to the memory card by electromotive force of the line to perform communication. As a result, even during a power outage,
Communication operation can be performed according to display and key operation.

FIG. 11 shows a circuit configuration of the present embodiment. The difference from the configuration of FIG. 1 is that the hook switch 21 is omitted, and power supply from the line is performed by the main controller 20 instead. A point in which a relay 27 for controlling is provided, and the line
1, in that power supply circuits 122 to 126 connected to L2 are provided.

[0050] Of the power supply circuit, numeral 123, a bridge diode 3 similar bridge diode, the capacitor for smoothing 124, 125 Zener diode for performing a clip to the reference voltage, 126 includes a diode 4 same <br / The diode is optically coupled to the photovoltaic diode array 9 as described above. The capacitor 129 is for stably supplying power to the memory card 14 by an AC component (such as a call signal) of the line.

FIG. 12 shows the operation in the above configuration similarly to FIG. Here, steps S3, S5, S9
2 is different from FIG.
Hereinafter, the operation of FIG. 12 will be sequentially described.

First, in the standby state of step S1, FIG.
As in 3, only the relay 2 (normally closed type) is on, and the other contact circuits are off. The relay 22 is on the B side.

In step S1 ', a power failure state is determined.
If the power is on, go to step S2. If the power is off, go to step S7.
Move to First, the operation at the time of energization after step S2 will be described.

<Step S2> When the memory card 14 is inserted from the standby state, the switch 11 is turned on as shown in FIG. 14, the diode 4 emits light, power is supplied to the dialer 8, and the resistor 10 is connected. The relay 17 is triggered, the AC power is turned on as described above, and the supply of the power supply voltage Vcc from the power supply unit 19 is started. Further, as described above, the relay 17 is held by the power supply voltage Vcc via the switch 12.

At this time, the relay 2 is turned off by the supply of Vcc, and the DC circuit is opened.

Further, the relay 22 switches to the A side,
The power supply voltage Vc is applied to the memory card 14 via the contact 13.
c is supplied.

<Step S3> In this state, when a call signal arrives at the lines L1 and L2, the rectified output of the bridge diode 123 causes the LED to emit.
126 is driven, the photovoltaic diode array 9, the resistor 1
The trigger is performed via 0, but at this point, there is no change since the power is turned on as described above.

<Step S4> When the memory card 14 is removed in this state, the switches 11 and 12 are turned off as shown in FIG. 15, the power supply to the relay 17 via the diode 16 is stopped, and the AC supply is stopped. Thereby, the relay 2
Turns on to prepare for the next card removal. When the memory card 14 is inserted again, the same operation as in steps S2 and S3 is performed.

<Step S5> When a call signal is received without the memory card 14, the operation shown in FIG. 16 is performed. In this case, the light emission of the LED 126 triggers the relay 17 via the diode 15, and the power is turned on. The relay 17 is held via the diode 16 when the main controller 20 turns on the relay 27.

The relay 2 is turned off by the supply of the power supply voltage Vcc. Further, the relay 22 switches to the A side.

<Step S6> After the communication is performed by the calling signal, the power supply is not required.
0 turns the relay 27 off. As a result, FIG.
Then, the relay 17 is shut off, the AC supply is stopped, and the supply of the power supply voltage Vcc of the power supply unit 19 is stopped. When the supply of the power supply voltage Vcc is stopped, the relay 2 is turned on to prepare for the next card installation. The relay 22 returns to the B side.

Next, the operation at the time of power failure after step S7 will be described.

<Step S7> The memory card 1 is shifted from the standby state (FIG. 13) of step S1.
4 when the mounting, as shown in FIG. 17, first switch 11 is turned on, the diode 4 emits light, the photovoltaic diode
The power is supplied to the memory card 14 because the array 9 generates a voltage and the relay 22 is at the B side at this time. As a result, the dialer 8 and the memory card 14
Can be used. After the start of communication, power is supplied by the line DC on the bridge diode 3 side.

<Step S8> When the memory card 14 is removed during a power failure, the switch 11
The DC loop is opened by opening the photovoltaic diode.
The power supply by the array 9 is stopped (FIG. 18).

<Step S9> In this state, when a call signal is received, power is supplied to the LED 126 as described above (FIG. 19). Usually, this signal is a 16 Hz intermittent signal (1 second continuous at 2 second intervals). If the user inserts the memory card 14 at this stage, the power supply to the memory card 14 is stably performed.
9 are provided. This capacity is set to a relatively large capacity in consideration of the above signal interval. After communication starts,
As in step S7, power is supplied by line DC on the bridge diode 3 side. The operation when the memory card 14 is inserted after the start of communication is the same as that in step S7.

<Step S10> After the end of the communication operation, since the line is opened, the power supply by the bridge diode 3 is stopped, and the process returns to the standby state of FIG. 20 (same as FIG. 13).

In the above embodiment, the functions relating to the bridge diode 3 to the zener diode 6 are the same as those of the first embodiment. However, in this embodiment, if there is no power failure, the AC power supply is triggered and activated by receiving a call signal. Hold can be performed, and no power supply during standby can be realized easily and inexpensively. The power cutoff by removing the memory card 14 is performed in the same manner as in the first embodiment even in the case of a trigger due to the reception of a call signal.

The circuit can be modified in the same manner as in the first embodiment.

[Third Embodiment] This embodiment assumes only a state in which the commercial power is supplied. This configuration is based on the configuration of the first embodiment, and as shown in FIG.
In FIG. 1, a relay 2 for supplying the power supply voltage by line DC is removed, and a relay 22 for supplying power to the memory card 14 by the output of the resistor 10 is removed.
The other configuration in FIG. 21 is exactly the same as that in FIG. 1, and the operation is the same as described above except that the memory card 14 is always supplied with the output of the power supply unit 19. The modifications are the same as in the first embodiment.

[Fourth Embodiment] In the second embodiment, when a power failure occurs,
A capacitor 129 is provided to stably supply power to the memory card 14. However, when a power failure is not assumed, that is, when only the operations of steps S2 to S6 in FIG. 12 need to be performed, as shown in FIG. In addition, a configuration in which the capacitor 129 in FIG. 11 is omitted and the relay 22 for supplying power to the memory card 14 by the output of the resistor 10 is removed can be used. The other configuration of FIG. 22 is exactly the same as that of FIG. 11, and the operation is the same as described above except that the memory card 14 is always supplied with the output of the power supply unit 19 side. The modification is the same as the second embodiment.

[0071]

As is apparent from the above, the claims of the present invention are evident.
According to the configuration of Item 1 , when the telephone line is DC closed,
The first light emitting means is driven by the DC current flowing through the telephone line.
Light emission, or a call signal flowing through the telephone line
The second light emitting means emits light by the alternating current, and the voltage generating means
A stage receiving light from the first or second light emitting means and
Pressure, and the starting means is generated by the voltage generating means.
Power supply of the power supply means is activated by the supplied voltage
In standby mode, no power is required and
By closing the line with a DC
Power supply using alternating current such as a ringing signal
Can start the pressure supply, without requiring any power supply in the standby state, by close the telephone line, there have
Uses alternating current such as a call signal flowing through the telephone line
, It is possible to provide an excellent communication device can activate the power voltage supply, further, the voltage generating means
Generating a voltage by receiving light from the first and second light emitting means;
The circuit is simple and inexpensive.
There is an advantage that can be. In addition, the structure of claim 2 of the present invention.
According to the configuration, by attaching a detachable external device,
And the telephone line is DC-closed, and
The power supply means via the voltage generation means and the activation means;
Activate the power supply of the stage and start communication.
Power supply with simple operation of attaching external devices
Excellent communication device that can start up and start communication
Can be provided. Further, the structure of claim 3 of the present invention.
According to the configuration, when a detachable external device is attached,
The voltage generated by the voltage generating means receiving the light of the light emitting means.
Voltage to the external device, and the DC power
The external device is operated by the flow and used for communication.
The external device can be installed simply by attaching the external device.
Activate the power supply to the device and immediately communicate with external devices
Provide an excellent communication device that can be used for
Can be.

[Brief description of the drawings]

FIG. 1 is an overall circuit diagram of a first embodiment of a communication device according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the communication apparatus according to the first embodiment of the present invention;

FIG. 3 is a circuit diagram for supplementing the flowchart of FIG. 2;

FIG. 4 is a circuit diagram for supplementing the description of the flowchart of FIG. 2;

FIG. 5 is a circuit diagram for supplementing and explaining the flowchart of FIG. 2;

FIG. 6 is a circuit diagram for supplementing the flowchart of FIG. 2;

FIG. 7 is a circuit diagram for supplementing the flowchart of FIG. 2;

FIG. 8 is a circuit diagram for supplementing the flowchart of FIG. 2;

FIG. 9 is a circuit diagram for supplementing the flowchart of FIG. 2;

FIG. 10 is a circuit diagram for supplementing the flowchart of FIG.

FIG. 11 is an overall circuit diagram of a communication apparatus according to a second embodiment of the present invention.

FIG. 12 is a flowchart for explaining the operation of the communication apparatus according to the second embodiment of the present invention;

FIG. 13 is a circuit diagram for supplementing the flowchart of FIG.

FIG. 14 is a circuit diagram for supplementing the flowchart of FIG.

FIG. 15 is a circuit diagram for supplementing the flowchart of FIG.

FIG. 16 is a circuit diagram for supplementing the flowchart of FIG.

FIG. 17 is a circuit diagram for supplementing the flowchart of FIG.

FIG. 18 is a circuit diagram for supplementing the description of the flowchart of FIG.

FIG. 19 is a circuit diagram for supplementing the flowchart of FIG.

20 is a circuit diagram for supplementing the description of the flowchart of FIG.

FIG. 21 is an overall circuit diagram of a third embodiment of the communication device of the present invention.

FIG. 22 is an overall circuit diagram of a fourth embodiment of the communication device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hook switch 2 Relay 3 Bridge diode 123 Bridge diode 4 Diode 5 Resistance 6 Zener diode 7 Resistance 8 Dialer 9 Photodiode 10 Resistance 11 Switch 12 Switch 13 Contact 14 Memory card 15 Diode 16 Diode 17 Relay 18 Manual switch 22 Relay 27 Relay 126 LED 129 capacitor

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-63-266956 (JP, A) JP-A-58-88959 (JP, A) JP-A-62-81866 (JP, A) JP-A-63-81866 50238 (JP, A) JP-A-62-286345 (JP, A) JP-A-5-48756 (JP, A) JP-A-58-169762 (JP, U) (58) Fields investigated (Int. Cl. ^7, DB name) H04M 19/00 - 19/08 H04M 1/00 H04M 1/24 - 1/253 H04M 1/58 - 1/62 H04M 1/66 - 1/82

Claims (3)

(57) [Claims] 1. A communication device connected to a telephone line, comprising: a power supply unit for supplying a predetermined power supply voltage obtained from a commercial power supply to each unit of the device; and a direct current flowing through the telephone line when the telephone line is DC- closed. a first light emitting means connected to said telephone line so as to emit light by a current, so as to emit light by alternating current signal flowing in the telephone line
A second light emitting means connected to the telephone line, and optically coupled to the first light emitting means and the second light emitting means;
By having a voltage generating means for generating a voltage by receiving the light of said first and said second light emitting means, an activation means for activating a power supply voltage supply of said power supply means by the generated voltage by said voltage generating means A communication device characterized by the above-mentioned. 2. A communication device connected to a telephone line.
To supply a predetermined power supply voltage obtained from the commercial power supply to each part of the device.
A power supply means, which is connected to the telephone line when the telephone line is DC closed;
Connected to the telephone line to emit light by direct current
Light emitting means, and voltage generating means for receiving light from the light emitting means to generate a voltage
And the voltage generated by the voltage generation means.
When the starting means for starting the power supply of the power supply means and the detachable external device are mounted, the telephone line is directly connected.
And a DC閉結means for flow閉結, the light emitting means emits light by the DC current flowing through the telephone line when the telephone line is DC閉結by the DC閉結means, whereby said light emitting means , The voltage generation
Means and a power supply of the power supply means via the activation means.
A communication device for activating pressure supply . 3. A communication device connected to a telephone line.
To supply a predetermined power supply voltage obtained from the commercial power supply to each part of the device.
A power supply means, which is connected to the telephone line when the telephone line is DC closed;
Connected to the telephone line to emit light by direct current
Light emitting means, and voltage generating means for receiving light from the light emitting means to generate a voltage
And the voltage generated by the voltage generation means.
And activation means for activating the source voltage supply source means, when the external device is mounted detachably, said light emitting means
Communication device, characterized in that it comprises a supply means for supplying a voltage generated by said voltage generating means which receives the light to the external device.