JPS592473A - Connecting circuit of user's set - Google Patents

Abstract

PURPOSE:To prevent malfunction such as resonance of bells with a simple constitution, by providing relays opened at the application of DC and closed at no call by the number of telephone sets, to a circuit connecting plural telephone sets in parallel with a pair of communication lines. CONSTITUTION:Dial telephone sets 10, 20 are connected in parallel to a pair of communication lines L1, L2 to constitute channels 11, 21, which are provided with relays 22, 12 connecting respectively normally-closed contacts 23, 13. In case of incoming waiting state, the contacts 13, 23 are closed, then an incoming signal to the lines L1, L2 rings both bells of the telephone sets 10, 20. When a handset of the telephone set 10 is hooked up, the channel 11 is conductive in terms of DC, the relay 12 is operated, the contact 13 is opened and the channel 21 is disconnected. In case of outgoing call from the telephone set 10, the contact 16 is intermitted, and a dial pulse is transmitted to the station side, and when the contact 16 is interrupted, a capacitor 27 connected to the bell 26 of the telephone set 20 is charged with a voltage from the station, and when the contact 16 is contacted, the contact 13 is interrupted, no C 27 is discharged and the bell 26 does not ring.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit that prevents malfunctions, particularly resonance, of home devices such as a plurality of telephones when connected in parallel to a pair of communication lines.

Conventionally, a connection circuit has been used in which a plurality of telephones are simply connected in parallel to a pair of communication lines (office lines) so that the communication line can be shared by a large number of telephones.

However, for example, rotary dial telephones are designed to intermittent line loops depending on the number of dials, so when dialing a certain telephone, the intermittent line loop is output to other telephones connected in parallel, and This has the disadvantage that the ringing of the bell causes so-called resonance, which makes users feel uncomfortable or misleads them into thinking it is an incoming ringtone.

As a means to prevent such malfunctions, a method has been proposed in which each telephone is equipped with a device that identifies an incoming call signal, a dial signal, and a URS signal, and the bell rings only when a ring signal is detected, but this method is expensive. There was a drawback.

In order to eliminate the above-mentioned conventional drawbacks, the present invention provides a circuit in which a plurality of household devices such as telephones are connected in parallel to a pair of communication lines. It has at least as many switches and circuits as there are in-house devices, each consisting of a contact drive section that opens the contact section when energized, and the contacts and drive sections r of each of the switch circuits are connected in series for each communication path corresponding to each in-home device. The contact section is connected in series to another communication path, or in addition to this, a rectifying element is connected in parallel with any contact drive section in a direction that conducts during communication.The purpose is to To provide a connection circuit capable of preventing malfunctions such as ringing of a bell with a simple configuration and capable of imparting a secret call function to any telephone set. The drawings will be described in detail below.

FIG. 1 shows a first embodiment of the present invention, and in the figure, 1
0 and 20 are rotary dial telephones, ■month, L2 is a pair of communication lines, and 11 and 21 are a pair of communication lines i!
(Branch) communication paths 12 and 22 connected in parallel to LI HL2 are relays (switch circuits). The telephones 10 and 20 are connected to communication paths 11 and 21, respectively. The relay 12 consists of a break contact (contact part 913) and an electromagnetic circuit (contact drive part) 14, and the relay 22 consists of a break contact 23 and an electromagnetic circuit 24, and the break contact 13 (23) The electromagnetic circuit 14 (24) is configured to be closed when no current is applied, and open when direct current is applied.The break contact 13 of the relay 12 is connected to the communication path 21, and the electromagnetic circuit 14 is connected to the communication path. 11, respectively, and the break contact 23 of the switched continuator 22 is connected to the communication line 11 in series.
The electromagnetic circuits 24 are connected in series to the communication paths 21, respectively.

Next, the operation will be explained. First, in the incoming call waiting state, the hook switches (not shown) in the telephones 10 and 20 cut off the communication paths 11 and 2 in a DC manner, and the break contacts 1, 3, and 23 are all in the closed state. It is in. Therefore, an incoming signal (for example, an AC signal of 1611z) arriving at communication line LI+L2 is transmitted to communication lines 11 and 2.
°1 and the bells of telephones 10 and 20 (
(not shown) are operated.

For example, when the handset (not shown) of the telephone 10 is picked up and turned off, the hook switch closes and the communication path 11 becomes DC conductive, and the power supplied from the office side causes
Since a direct current flows through the communication path 11, the electromagnetic circuit 14 of the relay 12 operates, the break contact 13 is opened, and the communication path 21 is disconnected. Thereafter, the conversation with the calling party is carried out only through the telephone set 10, and the conversation is kept confidential. Conversely, if the handset of the telephone 20 is picked up, a call can be made only through the telephone 20.

Next, the operation when making a call from one of the telephones, for example telephone 10, will be explained. When the handset of the telephone 10 is picked up, the knock switch closes in the same manner as described above, and the communication path 11 becomes DC conductive, and a DC current flows through the communication path 11 due to the power supplied from the central office, so that the relay 12
The electromagnetic circuit 14 operates, the break contact 13 opens, and the communication path 21 is disconnected. Next, dial the telephone 10 (
] Turn the dial pulse to the communication line LIIL2 (not shown).
This is related to the operation at this time. Regarding Figure 2, which shows only the elements, the following is
explain.

In FIG. 2, 16 is a dial (impulse) contact of the telephone 10, 26 is a bell of the telephone 20, and 27 is a bell 26.
This is a capacitor connected in series with . When the dial on the telephone 10 is turned, the dial contact 16 turns on and off the number of times corresponding to the dialed number. First, when the dial contact 16 is off, the electromagnetic circuit 1 of the relay 12
4 is not energized, the break contact 13 is in an open state, and the voltage (48V) from the station side is applied to the capacitor 27. (The polarity of the voltage at this time is as shown in the figure, the positive side is positive, and the I, 2 (llll) side is negative.

) Next, when the dial contact 16 is turned on, the communication path 11 is closed in a DC manner, and the electromagnetic circuit 14 becomes energized, so that the break contact 1 is opened. At this time, communication line L1
++ and 2 are short-circuited, and the voltage between them drops to almost 0■, but since the break contact 13 is open, the charge in the capacitor 27 is not discharged, and its voltage (lI 8 V
) are retained as is. Next, dial contact IG
When turned off, the break contact 13 closes as described above, and a voltage of the same polarity and voltage value as the charge is applied to the capacitor 27. Therefore, the charge in the capacitor 27 does not move. In this way, even if the dial contact 16 of the telephone 10 is turned on or off, the charge in the capacitor 27 does not move.
In other words, since no current flows through the communication path 21, the bell 26 does not operate and resonance can be prevented.

When the dial pulse is sent out and the exchange is connected to the other party, the polarity of the power applied to the communication lines Ll and L2 is reversed, but since direct current continues to flow through the electromagnetic circuit lll of relay]2, The break contact 13 is opened, the communication path 21 is cut off, and a communication can be made only between the telephone set 0 and the other party. Furthermore, when the telephone conversation ends and the handset is hung up, the hook switch is turned off and the telephone line 11 is also disconnected, so that the break contact 13 also returns to the closed state. Note that even when a call is made from the telephone set 20, resonance can be prevented in the same way as described above, and a secret call can be made.

FIG. 3 shows a second embodiment of the present invention, in which a diode (rectifying element) is connected in parallel with the electromagnetic circuit (contact driving section) of the relay. That is, in the figure, 15 is a diode connected in parallel with the electromagnetic circuit 14 of the relay 12, and 25 is a diode connected in parallel with the electromagnetic circuit 24 of the relay 22. Here, Dio-PI3.
The direction of 25 is such that after connecting to the other party through the station, that is, in the direction that conducts during a call (in the figure, the (+) pole of the diode is connected to the communication line L2, and the (-) pole of the diode is connected to Ll). . When a call is made from the telephone set 10 in such a configuration, when the handset of the telephone set 10 is picked up, the hook switch is turned on and the communication path 11 is closed in a direct current manner. At this time, the communication line L1 side is positive and 1
Since the 72f river is negative, the diode 5 is not conductive and direct current flows through the electromagnetic circuit 14, which turns off the break contact 13 and temporarily cuts off the communication path 21. After this, when the telephone 10 sends a dial pulse and connects to the other party, the polarity of the communication line "l" and Ii2 is reversed and "L"
The 2 side is positive and the Ll side is negative. In this state, most of the DC current flows through diode-1-+15,
Since almost no current flows through the electromagnetic circuit 11↓, the electromagnetic circuit 14 stops operating, and the break contact 13 returns to the on state. Therefore, when the telephone 20 is picked up in this state, most of the direct current flowing through the communication path 21 flows through the diode 25 as described above, so that the direct current flowing through the communication path 1
It is possible to join the call from the telephone 20 without disconnecting the telephone 1. Even when a call is made from the telephone 20, the user can join the call from the telephone 10 in the same manner as described above. The same applies when there is an incoming call from the other party. Note that the other configurations and resonance prevention effects are the same as in the first embodiment.

In addition, in the second embodiment, if only one of the diodes 15 and 25 is removed, priority can always be given to the communication path from which the diode is removed and the communication using the telephone set, and the conversation can be made confidential. Additionally, in order to ensure that the electromagnetic circuits 14 and 24 are not activated by direct current during a call, a diode 15 may be provided in series with the electromagnetic circuit 1.4.24 and in the opposite direction to the diode 15.25. good.

FIG. 4 shows a third embodiment of the present invention, in which three telephones are connected in parallel. That is,
In the figure, 30 is the third telephone, 31 is its communication path, and 32a
, 32b is a relay, 332°; 3b is a relay 32a
, 32b break contact, 34a.

3 lI 1) is the electromagnetic circuit of relays 32a and 32b, 3
5a.

35bi, diodes connected in parallel to the electromagnetic circuits 34a and 34b respectively, and the break contact 33a and the electromagnetic circuit 3
=l b is connected in series to the communication path 21, and the break contact 33b and the electromagnetic circuit 34a are connected directly to the communication path 31 and the contact 11. The rest of the configuration is the same as the circuit shown in Figure 3. Therefore, even if you try to make a call from any one of the three telephones 10, 20, and 30 and pick up the handset and turn the dial to send out a dial pulse, the other call path will not be connected to the first, Similar to the embodiment, the current does not flow at all and resonance can be prevented. Further, since a diode is connected in parallel to the electromagnetic circuit of each relay, while one telephone is talking, either or both of the other two telephones can participate in the call. The same applies when there is an incoming call.

In the third embodiment described in Section 2, for example, if only the diode 15 is removed, calls made by the telephone 10 can always be given priority over other telephones 20 and 30 and made confidential. Furthermore, if only the diodes 25, 351) are removed, the telephone call using the telephone 20 can always be prioritized and kept confidential.

In this manner, by appropriately selecting the connection point of the diode 15, it is possible to give priority to calls from a desired telephone and provide a secret call function. Furthermore, it is certainly possible to remove all the diodes and make each phone private.

FIG. 5 shows a fourth embodiment of the invention, which uses a relay with two break contacts to connect three telephones in parallel. That is, in the figure, 10
2, 202, 302 are relays, the relay 102 consists of a break contact 103°10.l and an electromagnetic circuit 105, the relay 202 consists of break contacts 203, 204 and an electromagnetic circuit 205, and the relay 302 consists of a break contact 103, 204 and an electromagnetic circuit 205; Contact point 303. :304 and an electromagnetic circuit 305. The electromagnetic circuits 105, 205, and 305 are connected in series to communication paths ]1, '21, and 31, respectively.
Furthermore, diodes 106, 206, and 306 are each connected in parallel and oriented to conduct during a call. In addition, break contacts 20:', 303 are provided on the communication path 11.
A break contact 103° 30 lI is connected in series to the communication path 21, and a break contact 104° 20/1 is connected in series to the communication path 31. Therefore, according to this embodiment, one less relay is required compared to the third embodiment. Note that the other configurations and effects are the same as those of the third embodiment.

In the embodiments described so far, the relay is installed inside or near the terminal board where the communication path branches.
From the viewpoint of workability, it is convenient to provide the communication paths at locations close to each other.

Also, when installing the diode, connect the communication line LI TL2.
It is necessary to pay close attention to the polarity of the

In addition, although the electromagnetic relay was used as a switch circuit, and the diode was used as a rectifier element, it may be comprised using other electronic relays, switching elements, etc. Furthermore, even if there are four or more telephones. Can be connected similarly.

As explained above, according to the present invention, in a circuit in which a plurality of in-home devices such as telephones are connected in parallel to a pair of communication lines, at least one contact portion is closed when the power is not energized; A switch circuit consisting of a contact drive section that opens the contact section when direct current is applied is installed at least in the premises (as many as there are devices), and the contact drive sections of each of the switch circuits are connected in series for each communication path corresponding to each in-house device. Since the contact part is connected in series to other communication paths, even if you pick up any handset, etc. of multiple telephones or other in-home equipment, DC current will flow through that communication path and the other communication paths will be connected. With a simple configuration, it is possible to prevent malfunctions such as resonance caused by dial pulses etc. being transmitted to other household equipment.
Moreover, each in-house device can be provided with a confidential communication function. Furthermore, if a rectifying element is connected in parallel with any contact drive unit in a direction that conducts during a call, calls made by in-home equipment on the communication path that does not include the rectifying element are given priority and are treated as confidential, and calls that include the rectifying element are This system has advantages such as being able to be configured to allow users to join the call midway through a call using home equipment on the road.

[Brief explanation of the drawing]

The drawings are for explaining the present invention, and FIG. 1 is a circuit diagram showing a first embodiment of the present invention, and FIG. 2 is only a portion of the circuit shown in FIG. 1 related to dialing from the telephone set 10. 3 is a circuit diagram showing a second embodiment of the present invention, FIG. 4 is a circuit diagram showing a third embodiment of the present invention,
FIG. 5 is a circuit diagram showing a fourth embodiment of the present invention. 1, 0, 20... Telephone, 11.21... Communication path, 12.22... Relay, 13.23... Break contact, 14,271... Electromagnetic circuit, 1.5.25... Diode, I4. L2... Pair of communication line patent applicant Nippon Telegraph and Telephone Public Corporation agent Patent attorney Yoshi 1) Takashi Sei

Claims (2)

[Claims] (1) In a circuit that connects multiple home appliances such as telephones in parallel to a pair of communication lines, at least one contact portion closes the contact portion when no current is applied, and opens the contact portion when direct current is applied. The contact drive parts of each of the switch circuits are connected in series for each call path corresponding to each home device, and the contact parts are connected to other switch circuits. A connection circuit for in-home equipment, characterized by being connected in series to a communication path. (2) In a circuit that connects multiple home devices such as telephones in parallel to a pair of communication lines, at least one contact portion closes the contact portion when there is no current, and opens the contact portion when direct current is applied. At least as many switch circuits as there are in-home devices are provided, and the contact drive sections of each of the switch circuits are connected in series for each call path corresponding to each in-home device, and the contact points are connected to other call paths. A connection circuit for in-home equipment, characterized in that a rectifying element is connected in series and in parallel with an arbitrary contact drive part in a direction that conducts during a call.