JPH0323733Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a communication line control device for a telephone, which controls line connection of a signal line by using a line current flowing through the signal line.

[Prior art] Some public telephones do not require an external power source.
There are devices that operate various control circuits and coin storage mechanisms by using line current flowing through signal lines connected to the telephone office.

A telephone line control device for such a telephone set is configured as shown in FIG. 3, for example. That is,
In the figure, 1a and 1b are signal lines connected at one end to the telephone office, and the other ends of the signal lines 1a and 1b are connected to a handset (not shown) via capacitors 2a and 2b for blocking the direct current component due to the line current. A communication circuit 3 is connected to the communication circuit 3 for transmitting a reception signal and inputting a transmission signal. One of the signal lines 1a is connected to a contact 4a of a switch which is linked to the operation of picking up the handset, and a contact 6a of a relay 6 which is driven by a control circuit 5 composed of a microprocessor or the like. Furthermore, signal line 1
A is connected to the A0 terminal of a rectifier circuit 8 that rectifies the line current via a chiyoke coil 7, and the A1 terminal of the rectifier circuit 8 is connected to the other contact 6b of the relay 6.
and is connected to a DC input terminal of the communication circuit 3 via a chiyoke coil 9. Further, the normally closed terminal of the contact 6b is connected to the other signal line 1b via a resistor 10 and to the rectifier circuit 8 via a parallel circuit of a Zener diode 11 and a capacitor 12.
Connected to B1 terminal. The B0 terminal of the rectifier circuit 8 is connected to the signal line 1b. Both terminals of the capacitor 12 are connected to the voltage input terminal VC of the control circuit 5,
connected to G. In addition, the contact 6a of the relay 6
The normally closed terminal is diode 13 and coin contact 1
4 to the common terminal of the contact 6b. The coin contact 14 has the function of being closed when a coin is inserted into the coin slot with the handset being picked up, and returning to its original open state when the call is ended and the handset is put down. It is a contact point with

The control circuit 5 also receives the input opening/closing information of the switch contact 4b and the coin storage mechanism 15.
The relay 6 is driven and controlled based on the amount information etc. from.

FIG. 4 is a specific configuration diagram of the coin contact 14. In the figure, reference numeral 16 denotes a coin trajectory that guides the coin 17 inserted from the coin slot into the coin storage mechanism 15. In addition, the frame 18 has a coin orbit 1
A detection lever 19 is pivotally supported by a shaft 20, and is rotated by the weight of a coin 17 passing through the detection lever 19. Further, a recovery lever 23 is pivotally supported on the frame 18 via a shaft 21 and has a roller 22 on which the other end of the detection lever 19 slides. and,
This recovery lever 23 is connected to the coin orbit 1 by a spring 24.
It is biased in six directions. The frame 18 also includes a coin contact 1 formed of a plurality of flexible metal plates.
4 is installed. This coin contact 14 is closed when the recovery lever 23 is rotated clockwise. Further, numeral 25 in the figure is a foot lever that moves up and down when the handset is picked up.

In such a configuration, when the handset is not picked up, the weight of the handset keeps the foot lever 25 in the lower position, rotating the recovery lever 23 counterclockwise, as shown in FIG. Therefore, in this state, the coin contact 14 is open. Further, the detection lever 19 is maintained in a horizontal position by a return spring (not shown). Next, when the handset is picked up, the handle lever 25 moves upward as shown in FIG. When the coin 17 is inserted into the coin slot in this state, the coin 17 collides with the tip of the detection lever 19 while moving downward within the coin track 16, causing the detection lever 19 to clockwise as shown in FIG. direction. Then, the other end of the detection lever 19 slides upward on the circumferential surface of the recovery lever 23. Then, as shown in the figure, the recovery lever 23 further rotates clockwise to close the coin contact 14.

Once the coin contact 14 is closed and state b is reached in the figure, even if the coin 17 moves downward in the coin track 16, the recovery lever 23 will not return to its original position due to the restoring force of the spring 24. Then, when the call ends and the handset is put down,
Since the foot lever 25 moves downward due to the weight of the handset, the recovery lever 23 and the detection lever 19 return to their original positions as shown in FIG. As a result, coin contact 14 is opened.

In such a telephone line control device, when the handset is left in place, the switch contact 4a, the coin contact 14, and the relay 6
Since each contact 6a, 6b is connected to the open state or normally closed terminal side as shown in the figure, the input terminal 2
6a and 26b are completely disconnected from the communication circuit 3.

Then, the handset was picked up and coin 17
When the coin is turned on, the contact 4a and the coin contact 14 are closed. Then, the input terminal 26a, the contact 4a,
6a, coin contact 14a, contact 6a, resistor 10,
Zener diode 11, B1 terminal of rectifier circuit 8,
A current supply path consisting of the B0 terminal and the input terminal 26b is formed. As a result, capacitor 12 is charged with line current. Then, when the voltage between the terminals of the capacitor 12 rises to a specified voltage determined by the Zener voltage of the Zener diode 11, the control circuit 5 starts operating. The control circuit 5 then drives the relay 6 based on the inserted coin information from the coin storage mechanism 15. Then, each contact 6a, 6b
is connected to the normally open terminal side. As a result, the input terminal 26a, contacts 4a, 6a, Chiyoke coil 7, A0 terminal and A1 terminal of rectifier circuit 8, contact 6b, Chiyoke coil 9, communication circuit 3, Zener diode 1
1. B1 terminal, B0 terminal, input terminal 2 of rectifier circuit 8
A current supply path consisting of 6b is formed. Therefore, the capacitor 12 is constantly charged to a specified voltage by the line current.

When the call ends and the handset is put down, the touch switch contact 4a is opened and at the same time the coin contact 14 is opened. Then, the control circuit 5
detects the open state of contact 4b and returns relay 6 to its original state. Therefore, each contact 6 of the relay 6
a and 6b return to their original state. As a result, this telephone line control device returns to its initial state.

[Problems to be Solved by the Invention] However, even in the telephone line control device configured as described above, the following problems occurred. That is, as described above, the coin contact 14 built into this telephone line control device is closed by the weight of the coin when a coin is inserted into the coin slot with the handset being picked up, and thereafter the coin contact 14 is closed by the weight of the coin. Since it is necessary to mechanically maintain the closed state and return to the original open state when the call ends and the handset is put down, the contact mechanism is very difficult to maintain, as shown in Figure 4. This necessitates a complicated mechanical configuration. Therefore, not only does the overall phone become more complex, but the manufacturing costs also increase.

Furthermore, depending on how the public telephone is installed, there is a concern that the coin contact 14 may malfunction due to vibrations or shocks applied from the outside.

The present invention was developed based on these circumstances, and its purpose is to transfer the line current from the signal line through a thyristor that responds to the closing operation of the coin contact, which operates only at the moment the inserted coin passes. An object of the present invention is to provide a call line control device for a telephone, which simplifies the coin contact mechanism by supplying the same to the charging circuit, thereby reducing the overall size of the telephone, reducing manufacturing costs, and improving reliability.

[Means for Solving the Problems] The telephone call line control device of the present invention includes a coin insertion detection mechanism having a coin contact that is closed when a coin inserted into the coin insertion slot passes through the coin orbit. , a charging circuit is provided which is charged by a line current flowing through a signal line connecting a telephone call circuit that inputs a transmit signal to the handset and sends a receive signal, and a telephone office, and supplies current from the signal line to the charging circuit. An auxiliary current supply path is provided in parallel with the circuit, a switching circuit that switches and connects the signal line to the communication circuit or the auxiliary current supply path, a thyristor inserted in the auxiliary current supply path, and a switching circuit that responds to the closing operation of the coin contact. a thyristor gate circuit that guides the line current flowing from the signal line to the gate terminal of the thyristor;
A control circuit is provided which is driven by the charging voltage of the charging circuit and controls switching of the switching circuit to the communication circuit side.

[Function] With the telephone call line control device configured as described above, when the handset is picked up, a coin is inserted, and the coin contact of the coin insertion detection mechanism is closed even momentarily, the line flowing from the signal line is Current flows through the thyristor gate circuit to the gate terminal of the thyristor. Therefore, the thyristor becomes conductive and the charging circuit is charged. Then, the control circuit operates with the charging voltage of this charging circuit.

[Example] An example of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit diagram showing a speech line control device for a telephone according to an embodiment. That is, a pair of signal lines 31
One end of a, 31b is connected to the telephone office via each input terminal 32a, 32b, and the other end is connected to the capacitor 33.
It is connected to the communication circuit 24 via a and 33b. One signal line 31a has a switch contact 35a that is linked to the operation of picking up the handset.
Contact 3 of relay 37 driven by control circuit 36
7a is inserted. Further, the signal line 31a is connected to A0 of the rectifier circuit 39 via the choke coil 38.
The A1 terminal of the rectifier circuit 39 is connected to the DC input terminal of the communication circuit 34 via the other contact 37b of the relay 37 and the choke coil 40. Note that a smoothing capacitor 41 is inserted between the normally open terminal of the contact 37b and the signal line 31b.

The normally closed terminal of contact 37b of relay 37 is resistor 42
B1 of the rectifier circuit 39 via a charging circuit consisting of a parallel circuit of a Zener diode 43 and a capacitor 44.
connected to the terminal. B0 of this rectifier circuit 39
The terminal is connected to the signal line 31b. Both terminals of the charging circuit consisting of the Zener diode 43 and the capacitor 44 are connected to the voltage input terminal VC of the control circuit 36,
connected to G.

Contact 3 of relay 37 inserted in signal line 31a
The normally closed terminal 7a is connected to the common terminal of the contact 37b of the relay 37 via a thyristor 45 and a resistor 46 of the illustrated polarity. Thus, the thyristor 45 and the resistor 46 constitute an auxiliary current supply path to the charging circuit.

A thyristor gate circuit consisting of a coin contact 48 of a coin insertion detection mechanism 47 shown in FIG. 2 and a resistor 49 is inserted between the anode terminal and the gate terminal of the thyristor 45, and A resistor 50 is connected between the terminal and the terminal. Furthermore, a Zener diode 51 of the illustrated polarity is connected between the cathode terminal of the thyristor 45 and the common terminal of the contact 37b,
Furthermore, a capacitor 52 and a diode 53 having the polarity shown are connected between the common terminal of the contact 37b and the gate terminal. Further, a diode 54 having the illustrated polarity is connected between the connection point between the capacitor 52 and the diode 53 and the cathode terminal of the thyristor 45.

The control circuit 36 becomes operational when a specified voltage is input between the voltage input terminals VC and G from a charging circuit consisting of a Zener diode 43 and a capacitor 44. Then, the opening/closing information of the switch contact 35b, the amount information from the coin storage mechanism 55, etc. are input, and based on these information, the relay 37 is driven and controlled, and a control signal is sent to the communication circuit 34.

FIG. 2 is a specific configuration diagram of the coin insertion detection mechanism 47. In the figure, reference numeral 56 denotes a coin trajectory that guides the coin 57 inserted from the coin insertion slot to the coin storage mechanism 55 located below. The frame 58 also includes a coin 57 passing through the coin track 56.
One end of the detection lever 59, which rotates with the weight of
It is pivoted at 0. This detection lever 59 is held in a horizontal position by a weak spring 61. The above-mentioned coin contact 48 formed of a plurality of flexible metal plates is attached to a lower position of the frame 58.

In such a configuration, when a coin 57 is inserted into the coin slot, the coin 57 moves downward in the coin track 56 and hits the detection lever 5.
9 and rotates this detection lever 59 clockwise. Then, this detection lever 59 closes the coin contact 48. When the coin 57 moves downward, the detection lever 59 is returned to its original horizontal position by the spring 61. Therefore, the coin contact 48 immediately returns to its original open state.

The operation of the telephone call line control device configured as described above will be explained. First, when the handset is not picked up, the contacts 35a and 35b of the hook switch are open as shown. In addition, each contact 37a, 37 of the relay 37
b is connected to a normally closed terminal. Therefore, in this state, the line current input from the telephone office to the input terminals 32a and 32b is connected to the contact 3 of the switch.
It is blocked by 5a.

Next, when the coin 57 is inserted into the coin slot with the handset lifted up, the contact 35a
and the coin contact 48 is closed. Therefore, the input terminal 32a, the contacts 35a, 37a, the coin contact 48, the resistors 49, 50, 46, the contact 37b, the resistor 42, the Zener diode 43, and the rectifier circuit 39.
A current circuit consisting of the B1 terminal, the B0 terminal, and the input terminal 32b is formed. Therefore, the coin contact 48
A line current flows into the gate terminal of the thyristor 45 through a thyristor gate circuit consisting of a resistor 49 and a resistor 49. Therefore, this thyristor 45 becomes conductive.

When the thyristor 45 becomes conductive, the input terminal 32
A current supply path is formed by the contacts 35a and 37a, the thyristor 45, the resistor 46, the contact 37b, the resistor 42, the Zener diode 43, the B1 terminal and B0 terminal of the rectifier circuit 39, and the input terminal 32b. Note that once the thyristor 45 is made conductive, it will not be cut off unless the line current becomes zero, even if the coin contact 14a is opened.

Therefore, the charging circuit consisting of the Zener diode 43 and the capacitor 44 starts charging. Then, when the voltage between the terminals of the capacitor 44 rises to a specified voltage determined by the Zener voltage of the Zener diode 43, the control circuit 36 starts operating. The control circuit 36 is connected to the contact 35 of the switch.
When the closed state of b is confirmed, the relay 37 is driven.

When the relay 37 is driven, each contact 37a, 3
7b is connected to the normally open terminal side. Therefore, this time, the input terminal 32a, the contacts 35a, 37a, the chain coil 38, the A0 terminal of the rectifier circuit 39, and the A1
Terminal, contact 37b, chiyoke coil 40, communication circuit 34, Zener diode 43, rectifier circuit 39
An outgoing call line is formed from the B1 terminal, B0 terminal, and input terminal 32b. If a dial operation is performed in this state, a dial pulse signal is sent out. Then, you can talk to the other party.

Next, when the handset is put down, the contacts 35a and 35b of the switch are opened, so the control circuit 36 checks whether the contacts 35b are open and
The relay 37 is returned to its original state and the communication circuit 34 is stopped. Furthermore, since the contact 35a is opened, the inflow of line current is also stopped.
The telephone line control device then returns to its original state.

In addition, Zener diode 51, capacitor 5
2, resistor 46, diode 53, diode 54
is an operation stabilizing circuit for stabilizing the operation of the thyristor 45. In other words, when the thyristor 45 is conductive and a current supply path is formed with the telephone exchange, if the line current is interrupted momentarily due to noise or the like, the thyristor 45 is cut off and the current supply path is no longer established. becomes unsustainable. In order to avoid this, the capacitor 52 is charged with a voltage at a constant level determined by the Zener voltage of the Zener diode 51, and when the line current is interrupted and the thyristor 45 is cut off, the capacitor 52 is charged with a voltage determined by the Zener voltage of the Zener diode 51.
A gate current is supplied to the gate terminal of the thyristor 45 via 3. Then, when the line current returns, the thyristor 45 immediately returns to its original conductive state. Therefore, the current supply path can be maintained continuously even in the event of a momentary interruption of the line current.

In the telephone call line control device configured as described above, once the thyristor 45 is conductive, it continues to be conductive unless the line current is cut off, so the coin contact 48 transmits the gate current to the gate terminal when a coin is inserted. may be released after being supplied. Therefore, as shown in FIG. 2, the coin insertion detection mechanism 47 that operates the coin contact 48 only needs to detect the passing movement of the coin 57 with the detection arm 59 and instantaneously close the coin contact 48. Therefore, it is not necessary to have a complicated mechanical structure like the coin contact mechanism in the conventional device shown in FIG. 4, so that the entire device can be made smaller and simpler, and the manufacturing cost can be reduced.

Further, with such a configuration, malfunctions due to vibrations, shocks, etc. can be suppressed to a minimum, so the reliability of the entire telephone can be improved.

Note that the present invention is not limited to the embodiments described above. In the embodiment, coin contact 4
Although the coin insertion detection mechanism 47 incorporating the coin insertion detection arm 59 has a configuration as shown in FIG. 2, it is not limited to the configuration shown in FIG. You may also do so.

[Effects of the invention] As explained above, according to the invention, line current is supplied from the signal line to the charging circuit through the thyristor that responds to the closing operation of the coin contact, which operates only at the moment the inserted coin passes. ing.
Therefore, the coin contact mechanism is simplified, making it possible to downsize the entire telephone, reduce manufacturing costs, and improve reliability.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a telephone call line control device according to an embodiment of the present invention, FIG. 2 is a diagram showing a coin insertion detection mechanism of the same embodiment, and FIG. 3 is a circuit diagram showing a conventional call line control device. FIG. 4 is a circuit diagram showing the device, and FIG. 4 is a diagram showing the coin contact mechanism of the conventional device. 31a, 31b...signal line, 32a, 32b...
...Input terminal, 34...Telephone circuit, 35a, 35b
...Flex switch contact, 36...Control circuit,
37... Relay, 37a... Relay contact (switching circuit), 39... Rectifier circuit, 43... Zener diode, 44... Capacitor, 45... Thyristor, 47... Coin insertion detection mechanism, 48... Coin Contact, coin storage mechanism, 56...coin orbit, 57...coin, 59...detection lever.

Claims (1)

[Scope of utility model registration request] a coin insertion detection mechanism having a coin contact that is closed when a coin inserted into a coin insertion slot passes through the coin orbit; a telephone communication circuit and a telephone office that input a transmission signal to the handset and transmit a reception signal; a charging circuit that is charged by a line current flowing through a signal line connecting the signal line; an auxiliary current supply path provided in parallel with the current supply path from the signal line to the charging circuit; a switching circuit that switches and connects to the auxiliary current supply path; a thyristor inserted in the auxiliary current supply path; and a line current flowing from the signal line in response to the closing operation of the coin contact to the gate terminal of the thyristor. A telephone call line control device for a telephone set, comprising: a thyristor gate circuit that leads to a telephone call line; and a control circuit that is driven by the charging voltage of the charging circuit and controls switching of the switching circuit to a call circuit side.