KR850002664Y1 - On hook dialing telephone - Google Patents

Abstract

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Description

On-hook dial telephone unit without external power supply

1 is a circuit diagram of an on-hook dialing telephone apparatus of the present invention in a post-type 70-type telephone.

FIG. 2 (a) and FIG. 2 (b) are operation principle diagrams of the two-wound latching relay used in the present invention.

The present invention relates to an on-hook dialing device that uses a power source on the exchange side.

The “on hook” dialing function allows you to dial the same as you would when picking up and dialing the hand cell by pressing the “on hook” snap switch with the hand cell down on the phone. You can hear it. Of course, after the connection with the other party, you can talk with the hand cell, and if you put down the hand cell after the call, the call circuit is automatically opened without a separate switch operation.

In order to achieve the above functions, the conventional on-hook dialing telephone apparatus required a separate external power supply. Special-purpose telephones and telephones of simple changers, etc., are composed of relatively large frames and housings, so that power circuits essential for dial-signal amplifiers can be mounted in the structure, but this is difficult to implement in small telephones. It is also disadvantageous in the absence of economics, power outages, or direct current power.

The present invention is conceived in view of the above-mentioned defects, the input and connection contact (OFF I) 1 of the "on" snap snap value consisting of one connection contact (ON I) and one mobile contact (ON II). Two-wound latch-type relay with one mobile contact that acts as the input of a "off" snap switch and separates the dial signal amplification circuit and the telephone network from each other. Bridge diode rectifier to supply polarity power to amplifier, Zener diode to make this power to constant voltage and prevent overcurrent, and automatic gain control function to hear high quality dial tone without being affected by line condition When the amplifier for the signal amplification, etc. have been configured, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of the existing body 70-type telephone circuit 10 including the "on hook" dialing device 30 of the present invention.

FIG. 1 is a circuit diagram of an existing "on hook" dialing device 30 in combination with the existing 70-type telephone circuit 10.

In the state where the "on hook" dialing device 30 is not used, the bell 16 is driven when a bell signal is applied to the lines L ₁ and L ₂ , and when the user lifts the hand cell, the contact ( HS I) (HS II) connection line (L ₁ ), dial contact (Di), hook switch (HS II), handcuffs (21) (25) hook switch contact (HS I), line (L ₂ ) A call circuit leading to the call is configured to make a call. The contact Di (Ds) is a dialing contact, and the function of other elements in the telephone circuit 10 is already well known.

The "on hook" dialing device 30 of the present invention was constructed between the hook switch contact HS II and the line L1 of the above-described body 70 type telephone circuit 10. The "on hook" dialing device ( 30 is a bridge diode rectifier 31, a zener diode 32 for constant current, a two-wire latching relay (RLY), a relay stabilized capacitor 33, a volume coupling transformer 34, an amplifier 37 and a speaker ( 43). Of course, the latch type relay contact rly and the first contact ON I of the " on " switch of the " on hook " dialing device are constituted in the telephone circuit 10 as shown in the figure. The resistors 35 formed at both ends of the transformer secondary side are for volume control, and the capacitors 38, 40, 41, 42, and resistor 39 are peripheral circuits of the amplifier 37.

In the above circuit configuration, when the " on " switch is pressed to perform the " on hook " dialing, the connection state of the contacts ON I and ON II is switched and the first winding I of the relay RLY is switched. By this operation, the connection state of the contact rly displayed on the telephone circuit 10 is changed (4-1 open, 4-7 connection). At this time, the "ON" switch (ON I, ON II) is a non-rocking switch, and is restored to its original state immediately after being pressed, but the relay RLY used is a latch type that can store an input signal. The relay contact rly remains in operation. Accordingly, an AC signal picked up by the transformer 34, that is, a ring tone, is amplified by the amplifier 37 when the resistor 35 is rotated through the speaker 43. When dialing is performed to the user or counterpart subscriber Di (Ds) by the " on " " off " operation, the dialing is heard through the speaker 43.

At this time, when the other subscriber is busy, a busy tone comes out through the speaker 43. Then, when the " off " switch (OFF) is pressed, the second winding (II (drive and relay RLY) of the relay RLY ( rly) is in the initial state (4-1), 4-7 open).

On the other hand, when the other party responds, when the user hears the response through the speaker 43 and then lifts the hand cell to talk to the other party, the "on hook" is activated by the function of the contact (HS I) (HS II). The dialing device 30 is separated from the telephone circuit 10 and becomes a normal telephone state, and at the same time, the charging current of the capacitor 33 reaches the third contact HS III of the hook switch and the second of the relay RLY. By discharging through the winding II, the contact rly of the relay RLY is restored to its original position (4-1 connection, 4-7 openings).

Therefore, the operating power of the "on hook" dialing device of the present invention is supplied through the line (L1) (L2), bridge rectifier 31, the zener diode 32 for constant voltage.

FIG. 2 (a) and FIG. 2 (b) are the operating principle diagrams of the two-wound contact relay RLY used in the present invention. There is winding I between terminals 5 and 6 and winding II between terminals 2 and 3. Terminals 4, 1, and 7 are moving contact terminals, and are connected to terminal 1 or terminal 7 when the winding is excited around terminal 4 (when no voltage is applied to windings 1 and 2 (initial state) ) Is in either the state of FIG. 2 (a) or the state of FIG. 2 (b). If this contact is connected to terminal 4 and terminal 1 in the initial state as illustrated in Fig. 2 (b), in order to connect this contact to terminal 4 and terminal 7, Apply + voltage to terminal and-voltage to terminal 6.

At this time, even when the voltage applied to the I winding was removed, the contact point remained in a moved state. On the contrary, in order to return the moved contact to its original state, as shown in FIG. 2 (a), the + voltage is applied to the terminal 2 of the II winding and the-voltage is applied to the third terminal. Even when the voltage applied to the winding is removed, it is kept moved.

As described above, a hook dialing device of the present invention is provided in which an external power supply is not used by using a bridge rectifier and a latch type relay in an existing telephone circuit, thereby miniaturizing and economicizing a telephone.

Claims (1)

In the on-hook dialing device 30, a first coil I and a second coil II of a latch-type relay RLY having a parallel configuration in which one terminal thereof is connected to a secondary side of the volume coupling transformer 34. An external power supply device having a characteristic of being connected to the rectifier 31 by the switching action of the respective contacts ON II and OFF I / hook switch contacts HS III to operate the contacts rly. No on-hook dialing phone.