KR930003233Y1 - Telephone circuit - Google Patents

Abstract

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Description

Telephone reception maintenance circuit when leaving the handset

1 is a circuit diagram of the present invention.

2 is a conventional configuration diagram.

3 is a state diagram of another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

1: Hook switch 2: Interlock switch

3: ring signal generating section 4: call holding circuit

5: Call circuit 6: Push button

7: Telephone internal circuit RL _1- RL ₂ : Relay

R: Resistance C, C ₂ : Capacitor

TR: transistors SW _1, SW _2: relay contact

a, b, c, d, e, f, g ： contact

The present invention relates to a telephone reception holding circuit when the handset is left in the telephone so that the ringer can be transmitted and received even when the handset is left unattended.

In general, the conventional telephone is not able to send or receive the call signal of the incoming call when the handset is left out of the telephone due to a user's mistake or children's mischief, and will not be able to send and receive with the other party. In addition, line parking occurs due to the neglect of handsets in telephone switching facilities, which causes other telephone calls to be disturbed, and causes troubles in electronic switching facilities. The problem is that the reliability of the phone is caused.

Therefore, the present invention was devised to solve the above problems, and in order to allow transmission and reception as well as transmission and reception of ring signals, which are ringing tones, even when the handset is left out of the main body due to a user's mistake or various factors. By providing a simple reception and maintenance circuit with interconnection of transistors, capacitors, capacitors, and resistors, it not only solves communication disturbances caused by line occupation that may occur when the handset is left out, but also solves the troubles of the electronic switch, and also helps the emergency telephone caller to transmit information. It is intended to contribute to improving the reliability of the phone to be easy is the purpose of the present invention.

Hereinafter, described in detail by the accompanying drawings as follows.

As shown in FIG. ₁ , a normal ring signal generator 3 is connected to an input line L ₁ and L _{2 of a} telephone, and a hook switch 1 is installed, and at one end thereof, a relay RL ₁ (RL). ₂ ) Connect the circuit (5) by connecting the capacitor (C) and the relay (RL ₁ ) in parallel through the relay contacts (SW ₁ : RL ₁ contacts) and (SW ₂ : RL ₂ contacts) that are contacted by driving. On the other hand, the DC6V, which is a separate power supply installed in the telephone, is connected to the transistor (TR) collector via a relay (RL ₂ ) at one end of the interlock switch (2) for interlocking with the hook switch (1). Telephone reception at the time of the handset neglect, consisting of a contact holding circuit 4 connected to a transistor (TR) base via a contact point (SW ₁ : RL ₁ contact point), (SW ₂ : RL ₂ contact point) and a resistor (R1). It is a circuit.

Referring to the effect of the present invention made of the configuration as described above are as follows.

As example the water supply hwasu the hook switch (1) ON to call in order to use the phone is also ON the external power supply circuit hook switch (2) that works this call-hold circuit 4, the operation power (6VDC), the relay (RL ₂ the RL _1: to connect the contacts of the RL ₂₎ the relay contacts as the relay (RL ₁₎ of the circuit 5 to the call operation (SW _1:) relay contact (SW ₂ in the operation by the circuit 5 to the call Contacts) are connected so that the circuit of the call path 5 is constituted without being interrupted and the call is made.

When the handset is placed in the hookswitch (1) of the telephone after completion of the call, the next call is possible, but when the handset is left unattended or incorrectly placed on the hookswitch (1), the relay (RL ₁ ) of the circuit of the circuit (5) ) Is exactly 6-7 seconds after completion of the call, the relay RL ₁ stops the operation by the current cutoff command of the electronic exchange which sends the handset neglect 4-5 seconds. Accordingly, the relay contact SW ₁ is connected. Also separated to cut off the circuit.

In addition, as the relay RL ₁ stops operating, the relay contact (SW ₁ : RL ₁ contact) in the call holding circuit 4 is also disconnected, the power is cut off, and the relay RL ₂ is stopped so that The relay contact SW ₂ in the circuit 5 is also separated so that no circuit path circuit is constructed. As the circuit of the circuit 5 is cut by the circuit operation, there is no looping phenomenon. Therefore, the computer program of the electronic switch exchanges the original return command to the subscriber network of the electronic switch to release the line lockout and leave the handset unattended. In the state, when a call is made from the outside, the bell signal transmits that the call is received regardless of the hook switch 1, so that the call can be received.

When the bell signal rings, pick up the handset and press the hook switch once, and then the hook switch and interlock switch will be cut off for a short time, and the external power supply will stop for a while. The contact point (SW ₂ ′) of the relay (RL ₂ ) Moving from f) to contact g, the power is connected to the transistor TR of the call holding circuit 4, and when the relay RL ₂ is operated, the relay contact SW ₂ of the call path circuit 5 is connected. to be the call current to flow from telephone exchange relay (RL ₁₎ relay contacts to prevent the instantaneous cutting since the 0.2 seconds required to operate (SW ₂₎ connected time hayeoteumeuro using a capacitor (C ₂₎ to extend between 0.2 relay (RL ₁ ) receives the talk current from the electronic exchange and operates the relay contact (SW ₁ ) on the talk circuit and is maintained until the call is completed.

In this way, when the relay contact SW ₁ is connected by the operation of the relay RL ₁ , the relay contact SW ₁ ′ in the call holding circuit 4 is separated to stop the operation of the relay RL ₂ of the call holding circuit. Accordingly, the relay contact (SW ₂ ) is separated and the call function is maintained until the call is completed.

Figure 3 shows another embodiment of the present invention by removing the hook switch (1) and equipped with a push button 6 having such a function to artificially supply the power of the call holding circuit (4) and the position of the handset It is easy to operate regardless.

The present invention, which operates as described above, is connected to a commonly used telephone switch 2, a transistor (TR), a relay (RL ₁ ) (RL ₂ ) and a resistor (R), a capacitor (C) (C ₂ ) By adding a call holding circuit (4) consisting of long-term occupancy of the telephone line due to neglect of the handset, it is possible to solve the call disturbance caused by efficient operation of the electronic exchange facility as well as to transmit information of emergency callers. This is a useful design that can contribute to improving the reliability of the phone.

Claims (1)

Connect the ordinary ring signal generator 3 to the input line L ₁ (L ₂ ) of the telephone, install the hook switch 1, and contact one end of the telephone by driving the relay RL ₁ (RL ₂ ). Connect the condenser (C) and the relay (RL ₁ ) in parallel via the relay contacts (SW ₁ ) and (SW ₂ ) to form a circuit (5) and hook-up switch (1) At one end of the interlock switch (2) to open and close in synchronization with the transistor (TR ₂ ) via the relay (RL ₂ ), the relay contacts (SW ₁ ′) (SW ₂ ) and the resistor (R ₁ ) at the same time. The telephone reception holding circuit at the time of the handset leaving comprising the call holding circuit (4) connected to the base of the transistor (TR).