JPS63220639A - Telephone set - Google Patents

Abstract

PURPOSE:To secure a safety to a surge current, etc., by adding the output of a switch circuit only to a telephone set holding circuit connected to a telephone circuit connected to a calling circuit, and separating completely the telephone circuit connected to the calling circuit and the telephone circuit not connected to the calling circuit. CONSTITUTION:A telephone set provides a first interlocking switch 20 interlocking and changing over to a first change-over switch 18 to change over whether or not the output from a first rectifier circuit 5 connected to a first telephone circuit 1 and connect a first telephone set holding circuit 7 is added to a calling circuit 15 and a second interlocking switch interlocking and changing over to a second change-over switch 19 to change over with the action contrary to the first change-over switch 18 whether or not the output from a second rectifier circuit 6 connected to a second telephone line 2 and connect a second telephone set holding circuit 11 is added to the calling circuit 15. The output of a switching circuit 17 is connected through a first interlocking switch to the first telephone set holding circuit, connected through a second interlocking switch to the second telephone set holding circuit and a first telephone circuit 1 and a second telephone circuit 2 are completely separated.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention connects a plurality of telephone lines and connects a desired telephone line to one telephone line.
The present invention relates to a means for separating each telephone line in a telephone that performs a telephone call operation by connecting two telephone communication circuits.

(b) Conventional technology A telephone capable of making telephone calls by switching and connecting multiple telephone lines to one telephone circuit was developed in 1986-23.
As described in Publication No. 756, a ringer circuit is provided for each telephone line to notify incoming calls for each telephone line, and by listening to the notification and switching a changeover switch, it is possible to switch between the call circuit and the incoming call. I connected it to the telephone line I had previously and was able to make calls. The circuit of a telephone that performs such operations has a configuration as shown in FIG. First, in Fig. 2, (31) is the first telephone line,
(32) is the second telephone line, (33) and (34) are the first telephone line.
Connect to the telephone line (31) and the second telephone line (32),
A first ringer circuit and a second ringer circuit that detect a transmitted calling signal and emit a sound, (35) and (36)
) are a first diode bridge circuit and a second diode bridge circuit connected to the first telephone line (31) and the second telephone line (32) and perform rectification and polarity determination; (37) and (loose) are the first diode bridge circuit and A first telephone holding circuit and a second telephone holding circuit are directly connected to the diode bridge circuit (35) and the second diode bridge circuit (36).
The telephone holding circuit (3z) and the second telephone holding circuit (outward) have the same configuration. First and second telephone holding circuits (M) in this telephone.

(Japanese) The first telephone holding circuit (3z) is connected to a first DC closing circuit (39) for putting the first telephone line (31) on hold, and a first direct current closing circuit (39) for putting the first telephone line (31) on hold.
The first holding switch (40) controls the operation of the first holding switch (40) and the first capacitor (41) for preventing malfunction. ) puts the first DC connection circuit (39) into an operating state. Similarly to the first telephone holding circuit (3z), the second telephone holding circuit (3z) also includes a second DC closing circuit (43) and a second holding switch (43).
4) and a second capacitor (45), and in response to the operation of the second hold switch (44), the second DC closing circuit ( 43) becomes operational state 6(
47) is a communication circuit that performs a communication operation, (48) is a third guide bridge circuit that rectifies and applies a current with a fixed polarity to the communication circuit (47), (49) is a hook switch, and 50) is a A first changeover switch (51) connects directly to the first telephone line (31) and switches the connection operation to the telephone circuit (47);
a second changeover switch (52) that is directly connected to the communication circuit (47) and switches the connection operation to the communication circuit (47), and is in an operating state opposite to the operation of the first changeover switch (50);
) is a third changeover switch that is switched in conjunction with the first changeover switch (50), and when turned off, receives current from the first telephone line (31) and charges the first capacitor (41). (53) The second telephone line (
32) charges the second capacitor (45). (54) is a switch circuit which is linked to the off-hook of the hook switch (49) to transfer the current from the external power source to the first and second diodes (55) and (56).
) in addition to the first and second phototransistors (42
) and (46> are kept in a standby state.

The operation of the telephone with the above configuration will be explained using FIG. 2. First, when the first changeover switch (50) is turned on and the state shown in FIG. It is detected by the circuit (33) and emitted as a ringing tone. When the user hears the ringing tone being emitted, he or she presses the hook switch <4 to make a call.
9), the signal transmitted via the first telephone line (31>) is transferred from the first changeover switch (50) to the sock switch (49> to the third diode bridge circuit (48)).
It is connected to the telephone call circuit (47) via the telephone line, and a telephone call operation is performed. In such a state, the switch circuit (54) becomes operational in conjunction with the closing of the hook switch (49), and the first
Photodiode (55) and second photodiode (
56) to the operating state, but the first and second hold switches (
40) and (44) are both in the off state, so the first phototransistor (42) and the second phototransistor (46) do not operate. Therefore, the first DC connection circuit (39) and the second DC connection circuit (43) become inactive, and the signal transmitted from the first telephone line (31) is transmitted to the first DC connection circuit (43). 39), but is not output. In such a state, a calling signal is transmitted via the second telephone line (32), detected by the second ringer circuit (34), and emitted as a ringing tone. 1st telephone line (31
), the user who is talking with the other party presses the first hold switch (4).
0) is turned on, the second changeover switch (51) is turned on, and the first changeover switch (so)t is turned off, so that the signal applied to the first diode bridge circuit (35) is transferred to the first changeover switch (51). It passes through the third changeover switch (52) which is turned off in conjunction with the switch (50), and is applied to the first phototransistor (42) via the first capacitor (41) and the first holding switch (40). Thereby, the first phototransistor (42) is connected to the first DC closing circuit (
39), and the first DC connection circuit (39)
is activated and the first telephone line (31) is placed on hold. When the second changeover switch (51) is turned on, the third diode bridge circuit (48) that connects the telephone line (47) switches from the state connected to the first telephone line (31) to the second changeover switch (51). via the second telephone line (3
2) will be connected. Therefore, the signal sent via the second telephone line (32) is added to the communication circuit (47) via the third diode bridge (48), and the signal is sent via the second telephone line (32). You can talk to the person you are calling. In such a state, the signal sent via the second telephone line (32) is not connected to the second direct current connection circuit (43) because the second DC connection circuit (43) is in an inoperable state due to the second hold switch (44) being turned off. The output is not enough just by applying the voltage to the diode bridge circuit (36). In such a state, the second holding switch (44) is turned on, and the first changeover switch (44) is turned on.
50) is turned on and the first holding switch (40) is turned off, the second changeover switch (51) is turned off and the signal applied to the second guide bridge circuit (36) is switched to the second hold switch (40).
The fourth switch was switched off in conjunction with the changeover switch (51).
Pass through the selector switch (53) and connect to the second capacitor (45).
)-to the second phototransistor (46) via the second hold switch (40). As a result, the second phototransistor (46) applies an output signal to the second DC connection circuit (43), puts the second DC connection circuit (43) into the operating state, and puts the second telephone line (32) into the hold state. do. Further, by turning on the first changeover switch (50), a third diode bridge circuit (4) is connected to the communication circuit (47).
8) is connected to the first telephone line (31) via the first changeover switch (50), and the third changeover switch (52) is turned on in conjunction with the first changeover switch (50). By turning on the third changeover switch (52), the first phototransistor (
42) is cut off, the first phototransistor (42) becomes inoperable at the same time as the first hold switch (40) is turned off, and the first DC connection circuit (39)
The first DC connection circuit (39) is rendered inoperative. As a result, the first telephone line (31
) is released from hold, and the user can talk to the other party on the first telephone line (31) via the telephone line (47). As described above, a communication operation can be performed with the other party on both lines using one communication circuit (47).

(c) Problems to be Solved by the Invention In a telephone set having the above-described circuit configuration that allows a telephone call operation to be made using one telephone circuit (47) with the other party on two lines, the first telephone line (31 ) and the second telephone line (32
), so that they are not connected to each other, and the telephone communication circuit (47) is connected to the line for telephone communication by the first and second changeover switches (50) and (51). It is separated from unused lines. Additionally, phototransistors and photodiodes are used to prevent interference from commercial power sources. Therefore, the holding operation and the telephone line switching operation during the call operation can be performed without any problems, but due to the circuit configuration, the changeover switch that performs the switching operation is connected to each circuit in a complicated way, so the circuit as a whole is complicated. There is a connection relationship. Furthermore, conventionally, a commercial power source is used to activate the telephone hold circuit, so it is necessary to prevent external power sources from interfering with the telephone line, and also to prevent signals from being applied to the unused telephone line from the used telephone line and causing interference. A phototransistor is used to separate the first telephone line (31) and the second telephone line (32), but the phototransistor is subject to high voltage such as surge current sent through the telephone line. Since the voltage is often applied, a phototransistor that can withstand high voltage must be used.

But photo!・Generally, the price of Runsistor increases as the withstand voltage increases, so we have devised a diode and a capacitor so that a phototransistor with a low withstand voltage can be used. However, the ringer signal transmitted through the telephone line is consumed excessively, resulting in problems such as insufficient ringing tones. Therefore, the present invention solves these problems and provides a telephone with a simplified circuit configuration without impairing the conventional operability.

(d) Means for Solving the Problems The telephone of the present invention comprises: a first rectifier circuit connected to a first telephone line; a first telephone hold circuit directly connected to the first rectifier circuit; a first changeover switch that connects a telephone call circuit to the circuit; a second rectifier circuit that connects to a second telephone line; a second telephone holding circuit that connects directly to the second rectifier circuit; and a second telephone hold circuit that connects the second rectifier circuit to the telephone call circuit. and a switch circuit that is connected to the first telephone holding circuit via a first interlocking switch and to the second telephone holding circuit via a second interlocking switch.

(*) Function The telephone of the present invention can be connected to the first telephone line, and is interlocked with the first changeover switch that switches whether or not to apply the output from the first rectifier circuit connected to the first telephone hold circuit to the telephone call circuit. The first interlocking switch is connected to the second telephone line and the output from the second rectifier circuit connected to the second telephone hold circuit is applied or not to the telephone call circuit. The first telephone line and the second telephone line are completely separated by the switching operation of the second interlocking switch, which is switched in conjunction with the second changeover switch, which is switched by the second switching operation.

(f) Example An embodiment of the telephone according to the present invention will be described with reference to FIG.

(1) is the first telephone line, (2) is the second telephone line, (3)
is connected to the first telephone line (1), detects the incoming call signal, and emits a sound; (4) is connected to the second telephone line (2), and receives the transmitted call signal. The second ringer circuit 5) detects the calling signal and emits a sound.
The first diode bridge circuit (6) connects to the telephone line (1) and performs rectification and polarity determination operations;
2) is connected to the second diode bridge circuit and performs rectification and polarity determining operations; (7) is the first telephone hold circuit that is directly connected to the first diode bridge circuit (5); A first DC closing circuit (8) for performing the above, a first capacitor (9) for charging the first DC closing circuit (8) with electric charge for starting the first DC closing circuit (8), and a first capacitor (9) for charging the first capacitor (9). It is comprised of a first holding switch (10) for performing an operation of adding the generated charge to the first DC closing path (8). (11) is a second telephone holding circuit which is directly connected to the second diode bridge circuit (6) and has the same circuit configuration as the first telephone holding circuit (Z). Connection circuit (1
2), a second capacitor (13), and a second hold switch (14), and the first and second hold switches (10) and (14) are non-locking switches, and both switches are interlocked. Move. (15) is a communication circuit that performs a communication operation, (16) is a hook switch, and (17) receives a supply from an external power supply in conjunction with the off-book operation of the hook switch (16), and outputs an output signal depending on the operating state. A switching circuit (18>) for connecting the communication circuit (15) to the first diode bridge circuit (5) is a first changeover switch that performs a switching operation to connect the communication circuit (15) to the first diode bridge circuit (5).
5) and the negative terminal of the first telephone hold circuit (Z) and the ground (15a) of the telephone call circuit (15).

(19) is a second changeover switch that performs a switching operation for connecting the telephone call circuit (15) to the second diode bridge circuit (6); 11) and the ground (15a) of the communication circuit (15) are connected. Said first
It operates in conjunction with the operation of the selector switch (18),
When the first changeover switch (18) is on, the second changeover switch (19) is turned off. (20) is provided between the output part of the switch circuit (17) and the first telephone hold circuit (7), and is connected to the output part of the switch circuit (17) and the first telephone hold circuit (7). A first interlocking switch that switches the relationship moves in conjunction with the first changeover switch (18), turns on when the first changeover switch (18) is on, and connects the output section of the switch circuit (17) and the first telephone on hold. Connect with circuit (7). (21) is a second interlocking switch provided between the output part of the switch circuit (17) and the second telephone holding circuit (Dan);
19), and moves in conjunction with the second changeover switch (19).
is turned on at the same time as the switch circuit (17) is turned on, connecting the output section of the switch circuit (17) and the second telephone holding circuit (dan). In addition,
When the first hold switch (10) and the second hold switch (14) constituting the first and second telephone hold circuits (7) and (U) are operated, they are turned on, and the telephone call circuit (15) and the first telephone The first changeover switch (18) or the second changeover switch (1) connected to the telephone line (1) or the second telephone line (2)
9) is switched to the off state. Furthermore, the changeover switch that is in the OFF state at that time remains in that state. As described above, the telephone of the present invention is configured.

Next, the operation of such a telephone will be explained. First, the first
The telephone line (1) and the second telephone line (in a standby state where both lines are not in use, the telephone line (15), the first telephone hold circuit (7), and the second telephone hold circuit (11)
and the switch circuit (17) are both inactive. In such a state, when a ringing signal is transmitted via the first telephone line (1), the first ringer circuit (3) detects the signal and emits a ringing tone. Thereby, the hook switch (1G) is closed when the user turns on the first changeover switch (18) and puts the communication circuit (15) in the off-footer state, and the first changeover switch (18)
The telephone call circuit (15) is connected to the first diode bridge circuit (5) through the telephone line (1), and a call can be made with the caller of the first telephone line (1) via the telephone circuit (15) which is activated. Ru.

At this time, the switch circuit (17) is connected to the hook switch (1).
6) starts and outputs an output by the closing operation of the first capacitor (6) through the first interlocking switch (20) which is turned on in conjunction with the first changeover switch (18).
9) - Pass through the first changeover switch (18) and connect the communication circuit (1
5), the first capacitor (9) is charged. On the other hand, the second interlocking switch (2
1) is also applied with the output of the switch circuit (17), but since the second interlocking switch (21) is in the OFF state, the second interlocking switch (21) is in the off state.
The output of the switch circuit (17) is not applied to the telephone hold circuit (11). Therefore, the second capacitor (13) is not charged. In such a state, the first telephone line (1)
When a call signal is transmitted via the second telephone line (2) while you are talking to the caller, the second
The ringer circuit (4) detects the signal and emits a ringing tone, so the user who hears the ringing tone operates the first hold switch (10) to turn off the call circuit (1).
5) and the first diode bridge circuit (5) is turned off to disconnect the communication circuit (15) from the first telephone line (1). Further, the first interlocking switch (20) is also turned off, and the output of the switch circuit (17) is no longer applied to the first capacitor (9). On the other hand, the electric charge charged in the first capacitor (9) is added to the first DC closing circuit (8) at the same time as the first holding switch (10) is operated. As a result, the first DC connection circuit (8) performs a self-holding operation and puts the first telephone line (1) on hold. And the second changeover switch (
19), the telephone circuit (15) is connected to the second guide bridge circuit (6) via the second changeover switch (19), and the user can connect to the second telephone line via the telephone circuit (15). You can talk to the caller in (2). In such a state, the output of the switch circuit (17) is connected to the second capacitor (1) via the fourth changeover switch (21) which is turned on in conjunction with the second changeover switch (19).
3) - The communication circuit (15) passes through the second changeover switch (19).
), the second capacitor (13) charges the output of the switch circuit (17). On the other hand, the output of the switch circuit (17) is the first interlocking switch (2
However, since the first interlocking switch (20) is turned off by the first holding switch (10), it does not apply to the first capacitor (9). In such a state, when the call with the caller on the second telephone line (2) ends, the user turns on the first changeover switch (18), and the second changeover switch (19) is turned on.
) is switched to the off state, disconnecting the second telephone line (2) and the speech circuit (15). At this time, the second condenser (13
Even if the telephone line (
2) returns to the on-footer state. On the other hand, the first diode bridge circuit (5) and the communication circuit (15) are connected via the first changeover switch (18) which is in the on state.At this time, the first DC closing circuit in the -momentary self-holding state (8) and the telephone circuit (15) are connected in parallel to the first telephone line (1), but due to the low impedance of the telephone circuit (15), the first direct current connection circuit (8) The hold is released, and the user can again make a call with the caller of the first telephone line (1) via the call circuit (15). In addition, when the first telephone line (1) is on hold and a call is being made with the second telephone line (2), if the second telephone line (2) is also put on hold, the first telephone line (1) is By operating the second hold button (14), the second changeover switch (19) and the second interlocking switch (21) are turned off, as in the case of putting the hold on hold. Therefore, the communication circuit (15
) is disconnected from the second telephone line (2), while the output of the switch circuit (17) is no longer applied to the second condenser (13). Furthermore, at the same time as the second holding box (14) is operated, the charge stored in the second capacitor (13) is discharged to the second current closing circuit (12).

Thereby, the second current closing circuit (12) performs a self-holding operation and puts the second telephone line 2) in a hold state. Therefore, in such a state, both the first and second telephone lines (1) and (2) are put on hold. In such a state, if the first changeover switch (18) is turned on, the telephone call circuit (15) and the first telephone line (1) are connected, and a call operation is started between -19 and the caller of the first telephone line (1). If the second changeover switch (19) is turned on, the user can talk to the caller on the second telephone line (2).

As described above, the present invention allows basic operations to be performed without any problems.

Next, safety and reliability against surge currents and the like, and separability between each line in an embodiment of the present invention will be explained.

Safety and isolation against surges are not specific, so for example, if we use the FCC standard in the United States as a standard, one line will have a peak of 800 Vpeak and a width at half maximum of 56.
0 μsec, 1,5 KVpeak between each telephone line
, it is said that there is no problem if the surge has a half-width of 16,011 seconds. Generally, the surge period is short, but the voltage is quite high. First telephone line (1) and second telephone line (2)
To prevent surge currents between
) is used for telephone calls, the first telephone line (1) connects the first diode bridge circuit (5) - the first DC closing circuit (7) - the first interlocking switch (20) - the second interlocking switch ( 21) -=20- Second DC closing circuit (Dan) - Second diode bridge circuit (6) - Second telephone line 2), but in this state, the second interlocking switch (21) Since it is in an open state, the surge current applied in the above path is the second one.
It joins the interlocking switch (21).

Further, when the second telephone line (2) is used for a telephone call, it is connected to the first interlocking switch (20) on the opposite route to the above-mentioned route. Therefore, in the present invention, the first interlocking switch (20),
It is only necessary to make the second interlocking switch (21) capable of withstanding a voltage of 1.5 KV or higher, and the operations of the first interlocking switch (20) and the second interlocking switch (21) are made to be opposite to each other. The first telephone line (1) and the second telephone line (
2) can be separated. Kirani, another route 1st telephone line (1
) - first diode bridge circuit (5) - first changeover switch (18) - second changeover switch (19) - second diode bridge circuit (6) - second telephone line (2), the first changeover switch ( 18) or second selector switch (1
9) is in the open state, a surge current is also applied to the changeover switch in the open state, so the first changeover switch (
18) and the second changeover switch (19) can also withstand a voltage of 1.5 KV or more, safety against surge currents will be satisfied.

(G) Effects of the Invention The telephone of the present invention connects a plurality of telephone lines so that a single communication circuit can be used to communicate with the other party on the desired telephone line, and is linked to the switching operation of the first changeover switch. A telephone holding circuit connected to a telephone line which is completely connected to a telephone call circuit by switching a first interlocking switch which is switched in conjunction with the switching operation of the second changeover switch and a second interlocking switch which is switched in conjunction with the switching operation of the second changeover switch to be opposite to each other. In addition, the output of the switch circuit is applied only to the telephone line, and the telephone line connected to the telephone circuit is completely separated from the telephone line that is not connected to the telephone circuit, so high voltages such as surge currents are transmitted through the telephone line. Even if a surge current is added, it will not damage each changeover switch, so safety against surge currents, etc. can be ensured, and lines can be separated easily without having to install extra circuits. It is now possible to create a circuit with the same functionality as before.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an embodiment of a telephone according to the present invention, and FIG. 2 is a circuit diagram of a conventional telephone. Explanation of main drawing numbers (7)...First telephone hold circuit, (11)...Second telephone hold circuit, (15)...Telephone call circuit, (1
8)...first changeover switch, (19)...second changeover switch, (20)...first interlocking switch, (21)...second changeover switch, (20)...first interlocking switch, (21
)...Second interlocking switch.

Claims (1)

[Claims] (1) In a telephone that is connected to at least two telephone lines and performs a telephone call operation with a desired telephone line using one telephone call circuit, a first rectifier circuit that is connected to the first telephone line; a first telephone hold circuit that is directly connected to the rectifier circuit; a first changeover switch that connects the telephone call circuit to the first rectifier circuit; and a second rectifier circuit that is connected to the second telephone line;
a second telephone hold circuit directly connected to the second rectifier circuit;
a second changeover switch that connects the call circuit to the second rectifier circuit; and a second changeover switch that connects the first telephone holding circuit to the first telephone holding circuit via a first interlocking switch and to the second telephone holding circuit via a second interlocking switch. and a switch circuit that outputs an output only when the telephone call circuit is in an operating state, and the first telephone holding circuit is set in an operating state and a first changeover switch is operated to disconnect the telephone call circuit from the first rectifier circuit. As a result, the first telephone line is put on hold, and in conjunction with the operation of the first changeover switch, the first interlocking switch disconnects the switch circuit and the first telephone hold circuit, and the second telephone line is put on hold.
The changeover switch connects the telephone call circuit and the second rectifier circuit, and the second interlocking switch connects the switch circuit and the second telephone hold circuit to enable a telephone call to the second telephone line and to The output of the switch circuit is applied to the second telephone hold circuit, the second telephone hold circuit is activated, and the second changeover switch is operated to disconnect the telephone call circuit from the second rectifier circuit. When the telephone line is put on hold and in conjunction with the operation of the second changeover switch, the first changeover switch connects the telephone call circuit and the first rectifier circuit, and the first interlocking switch connects the switch circuit and the first telephone hold circuit. A telephone set, wherein the second interlocking switch separates the switch circuit from the second telephone hold circuit, and the output of the switch circuit is added to the first telephone hold circuit.