JP2544469B2 - Fax machine - Google Patents

Description

The present invention relates to a facsimile machine with a built-in telephone.

<Prior Art> A telephone in a facsimile machine with a built-in telephone is
Unlike conventional black phones, it uses an integrated circuit (IC) to reduce size and weight. However, since the direct current voltage from the telephone line cannot be directly used for the power source of this IC, a power supply circuit for supplying the direct current voltage to the IC by receiving the direct current voltage is provided. 2. Description of the Related Art Conventionally, as a facsimile apparatus having such a built-in telephone, there is one as shown in FIG. This facsimile apparatus has a facsimile section 21 and a telephone section 22, and a switching relay (CML) 23 switches a telephone line 24 to the facsimile section 21 and the telephone section 22 for connection. The facsimile section 21 is connected to a telephone line 24 via a transformer 25, and performs facsimile communication via the telephone line 24. Further, the telephone unit 22 outputs the voice signal from the telephone line 24 from the handset 30 via the bridge circuit 26, the hook switch 27, the dial pulse generation circuit 28, and the speech network 29, and the handset 30.
The voice signal input from the above speech network 2
9. The signal is output to the telephone line 24 via the dial pulse generating circuit 28, the hook switch 27, and the bridge circuit 26. The dial pulse generation circuit 28 receives the dial signal transmitted by the dial transmission IC 32 based on the operation of the operation unit 31, generates a dial pulse, and outputs the dial pulse to the telephone line 24 through the bridge circuit 26. It is supposed to do. Power is supplied from the power supply circuit 33 to the dial transmission IC 32.

If this fax machine is communicating by fax,
The CML 23 connects the telephone line 24 to the facsimile unit side, and the telephone unit 22 is in a state of not receiving DC power supply from the telephone line 24. Then, when the facsimile communication ends, CML23
Connects the telephone line 24 to the telephone unit 22 side. If the user wants to continue talking after the facsimile communication ends, the handset 30 is raised in advance and the hook switch 27 is closed before the facsimile communication ends.
Then, the facsimile communication ends and the DC closed state when the CML 23 connects the telephone line 24 to the telephone section side is maintained, and the telephone call can be continued.

<Problems to be Solved by the Invention> By the way, the power supply circuit 33 generally has a circuit configuration as shown in FIG. Here, 35 is a constant current circuit, which includes transistors 36, 37, resistors 38, 39 and capacitor 40.
It consists of Further, 42 is a diode for preventing backflow, 43 is a Schener diode for obtaining a constant voltage, and 44 is a capacitance component in the circuit. The capacitance component 44 is charged by the DC voltage supplied from the telephone line via the resistor 46 and the diode 47. When making a call, raise the handset 30, close the hook switch 27, charge the capacity component 44 through the constant current circuit 35, and dial
Starts up the operation of IC32 and closes the DC. In the standby state, the capacitance component 44 is charged via the resistor 46 and the diode 47.

However, as described above, during the facsimile communication, since the telephone unit 22 is in a state of not receiving DC power supply from the telephone line 24, the capacity component 44 is discharged during this period, and then the CML 23 is switched to the telephone side. However, it takes time to charge the capacity component 44, and the DC closing is delayed. When the delay time is 15 ms or more, the electronic exchange side determines that the DC loop is opened and disconnects the telephone line 24.

As described above, there is a problem that the line is disconnected and the call cannot be made due to the delay of the DC closing due to the time constant of the capacity component 44 of the power supply circuit 33.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a facsimile apparatus in which delay of DC closing does not occur when the telephone line is switched to the telephone section side after the facsimile communication is completed.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a facsimile section, a telephone section having an integrated circuit, and a switching section for switching and connecting a telephone line to the facsimile section and the telephone section. In a facsimile apparatus having a power supply circuit which is provided in the telephone unit and which receives a DC voltage from the telephone line and supplies power to an integrated circuit of the telephone unit, the facsimile unit is provided with the telephone unit during facsimile communication. And a charging current supply means that is provided in the facsimile section and that supplies a charging current for charging the capacitive component of the power supply circuit via the connecting means during facsimile communication. It has a feature.

<Operation> In the above configuration, during the facsimile communication, the connection means connects the telephone section to the facsimile section, and the charging current supply means supplies the charging current for charging the capacitive component of the power supply circuit via the connection means. To do.

Therefore, since the capacitive component of the power supply circuit is charged during the facsimile communication, the DC connection is performed without a time delay when the switching unit switches the telephone line to the telephone unit side after the facsimile communication is completed. Never breaks.

<Example> Hereinafter, the present invention will be described in detail with reference to illustrated examples.

FIG. 1 is a block diagram showing the circuit configuration of an embodiment of the present invention.

In FIG. 1, 1 is a facsimile unit, 2 is a telephone unit, and 3 is a CML for switching and connecting a telephone line 4 to the facsimile unit 1 side and the telephone unit 2 side. The facsimile unit 1 is connected to the telephone line via the transformer 5 as in the conventional example. The telephone unit 2 is switched and connected to the telephone line side and the facsimile unit side by a changeover switch 6. The change-over switch 6 is controlled by a control means (not shown) provided in the facsimile section 1, and is switched to the facsimile section side during facsimile communication, and to the telephone line side otherwise. The telephone unit 2 has the same circuit configuration as the telephone unit in the conventional example shown in FIGS. 2 and 3. Further, the facsimile unit 1 has the changeover switch 6 described above.
There is provided a charging current supply circuit 7 for supplying a charging current for charging the capacity component of the power supply circuit of the telephone section 2 via.

With the above configuration, the CML 3 is switched to the facsimile unit side during facsimile communication, and the telephone unit 2 is in a state of not receiving DC power supply from the telephone line 4, but the changeover switch 6 is switched to the facsimile unit side. The charging current is supplied by the charging current supply circuit 7, and the capacitance component of the power supply circuit is charged. Therefore, when the telephone unit 2 is connected to the telephone line 4 after the facsimile communication is completed, the DC connection is performed without a time delay, so that the exchange side can continue the call without disconnecting the line. it can.

<Effects of the Invention> As is apparent from the above, in the facsimile apparatus of the present invention, the connection unit connects the telephone unit having the integrated circuit to the facsimile unit, and the charging current provided in the facsimile unit. The supplying means supplies the charging current for charging the capacitive component of the power supply circuit for supplying the power to the integrated circuit by receiving the DC voltage from the telephone line through the connecting means. The capacity component of the power supply circuit is charged during communication, so that when facsimile communication is completed and the switching unit switches the telephone line to the telephone unit side, direct current is closed without a time delay and the line is disconnected. Without that, you can continue to talk.

[Brief description of drawings]

FIG. 1 is a block diagram showing a circuit configuration of an embodiment of the present invention, FIG. 2 is a block diagram showing a circuit configuration of a conventional example, and FIG.
The figure is a detailed view of the power supply circuit of the telephone unit in the above conventional example. 1 ... Facsimile unit, 2 ... Telephone unit, 3 ... Changeover relay (CML), 4 ... Telephone line, 5 ... Transformer, 6 ... Changeover switch, 7 ... Charging current supply circuit, 33 ... Power supply circuit, 35 ... Constant current circuit, 44 ... Capacitance component.

Claims (1)

(57) [Claims] 1. A facsimile unit, a telephone unit having a built-in integrated circuit, and a switching unit for switching and connecting a telephone line to the facsimile unit and the telephone unit. The telephone unit is provided in the telephone unit and is connected to the telephone line. In a facsimile apparatus having a power supply circuit that receives a DC voltage and supplies power to an integrated circuit of the telephone section, a connection means for connecting the telephone section to the facsimile section during facsimile communication, and the facsimile section, A facsimile apparatus, comprising: a charging current supply means for supplying a charging current for charging a capacitive component of the power supply circuit via the connection means during facsimile communication.