JPH0139025Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field of the invention The present invention relates to an automatic button recovery device for a button telephone device.

(2) Technical background In general, automatic button recovery devices include mechanical and electrical types. When an automatic button recovery device is attached to a button telephone, the lock-type push-button key of the button telephone will be unlocked by the operation of the lock switch and the recovery. When this happens, the lock-type push-button electric key is restored, and at the same time the line is disconnected, making it impossible to perform the locking operation and to receive the locking service. Therefore, there is a need for an automatic button recovery device that allows the user to receive the hooking service through normal operations.

(3) Prior art and problems When implementing a hooking service using a conventional button telephone device, as a countermeasure, it is necessary to provide the telephone with a separate switch or key as a substitute for the touch switch, or to use one of the keys on the telephone as a substitute for the touch switch. By using this, when receiving the hooking service, you can receive the hooking service by operating those switches or the electric key instead of using the hook switch.

In this way, installing a special switch or the like on a telephone or substituting one of the existing electric keys just to receive the locking service with the automatic button recovery device increases the price of the button telephone. It has many drawbacks, such as being connected to the system, removing functions, making operations more complicated, and having a poor appearance.

(4) Purpose of the invention This invention has been made in view of the above-mentioned drawbacks of the conventional technology, and has been developed to solve these drawbacks.Even if an automatic button recovery device is installed, the footing service can be performed without any special operation. The purpose of this invention is to provide an automatic button recovery device that can be used in normal operations.

(5) Structure of the invention According to the invention, the object is to provide a first capacitor that is charged when the switch is in an operating state, a first semiconductor element constituting a discharge circuit for the first capacitor, A first diode whose electromagnet does not operate while the first capacitor is being charged, and a second diode which is charged when the switch is in the recovery state and operates the first semiconductor element using the charging current of the capacitor. a second semiconductor element that causes the second capacitor to be discharged during operation of the capacitor and the switch; and a second diode that prevents the discharge current of the first capacitor from flowing to the second semiconductor element; An automatic button recovery device, which includes an electromagnet that operates to restore the button with the discharge current of a first capacitor when the switch is restored, is charged when the switch is in operation and discharged when the switch is restored. A third capacitor is configured to delay recovery of the second semiconductor element which is in the state and is in operation by a discharge current of the capacitor, and the discharge current of the third capacitor is connected to the second diode. This is achieved by providing an automatic button recovery device for a key telephone, characterized in that it is provided with a third diode for blocking current.

(6) Examples of the invention Examples of the invention will be described below in detail with reference to drawings.
FIG. 1 shows an embodiment of an automatic button recovery device for a button telephone according to the present invention.

In Figure 1, HS is a switch,
TM is a timer circuit that provides a delay time so that the button automatic recovery device does not operate even if the operation of the switch HS is restored in order to receive the hooking service. C1 is a capacitor that is charged when the switch HS is in operation, and its charging current is charged through the diode D1. TR1, TR
2 is a transistor, TR1 is a semiconductor element constituting a discharge circuit for the capacitor C1, and TR2 is a semiconductor element that is controlled by a timer circuit and controls the operation of TR1 according to its delay time. C
2 is a capacitor which, when the switch HS is restored, turns on the transistor TR1 with its charging current. MG is contacted by the lock type push button electric key, and when the lock switch HS is restored,
This is an electromagnet for automatically restoring a locked pushbutton key (not shown in the diagram).

D2, D3, D4 are diodes, R1, R2,
R3 and R4 are resistors.

Next, the operation will be explained.

When the handset is raised to make or answer a telephone call and the switch HS is activated, the power is transferred to the diode D1,
D4, the capacitor C1 is charged through the resistor R1. At this time, the electromagnet MG does not operate because only the forward voltage of the diode D1 is applied to both ends of the coil. At the same time, current flows between the base and emitter of the transistor TR2 through the timer circuit TM, turning on the transistor TR2. When transistor TR2 turns on, capacitor C2, which is normally charged, becomes transistor TR2,
It is discharged through resistor R2. transistor tr
1, capacitor C2 remains charged under normal conditions, so no current flows between the base and emitter, and even when the switch HS is operating, capacitor C2 is discharged, but no current flows between the base and emitter, so it is cut off. Once the call is made, the answer is made, and the call is completed, the handset is put down and the touch switch is restored, power is no longer supplied to the timer circuit.
Due to the recovery delay circuit of the timer circuit, after a certain period of time, ie, a certain period of time during which the hooking service can be received, the current flowing between the base and emitter of the transistor TR2 is no longer supplied, and the transistor TR2 is cut off. Transistor TR2
is cut off, charging current flows to capacitor C2. Power supply - Resistor R3 - Capacitor C2 (+ side - -
side) − It flows. Therefore, the charging current is
1 (between the base and emitter), the transistor TR1 is turned on, a discharge circuit for the capacitor C1 is formed, and the capacitor C1 starts discharging.

Due to the diode D1, a discharge current flows through the capacitor C1 (+ side), the electromagnet MG, the transistor TR1 (collector-emitter), and the capacitor C1 (- side), and the electromagnet MG operates.

At this time, due to the diode D4, the discharge current of the capacitor C1 does not flow into the timer circuit section, and the transistor TR2 does not turn on.

By operating the electromagnet MG, the central office line button (or extension button) which was locked when the connected lock-type pushbutton telephone key was pressed is unlocked and automatically restored. Incidentally, when the power supply is interrupted while the switch HS is in operation, the charge in the capacitor C1 is discharged through the diode D2. Next, FIG. 2 will be explained.

FIG. 2 shows a specific embodiment of the timer circuit section in FIG. 1, and the components other than the timer circuit section are the same as those in FIG. 1 and are operated.

C3 is a capacitor, which connects transistor TR2 for the delay recovery time after the switch HS is restored.
This is to maintain the on state with discharge current. R6R5 is a resistor, R5 is a resistor for providing a delay recovery time with the capacitor C3, and R6 is a resistor for limiting the charging current of the capacitor C3. D5
is a diode that prevents the current from flowing in the opposite direction to the transistor TR2 when the capacitor C3 discharges.

Next, the operation will be explained. Since everything other than the timer circuit is the same as in FIG. 1, only the timer circuit will be explained and the rest will be omitted.

When the handset is raised to make a call, answer, or talk, the hook switch HS is activated and power is charged to the capacitor C3 through the diode D5 and resistor R6. When charging of capacitor C3 is completed, it is connected to transistor TR2 or resistor R4 through resistor R5.
Current flows through the transistor TR2, turning on the transistor TR2. At the same time, the capacitor C1 is charged in the same way as in FIG. 1, and the description thereof will be omitted below.

When you hang up the handset after making a call, answering the call, or ending the call, the power switch HS is restored and the power is switched to diode D5,
Although it is no longer supplied to the transistor TR2 through the resistors R5 and R6, the charge in the capacitor C3 flows through the resistor R5, and a discharge current flows into the transistor TR2 (between the base and emitter) for a delay recovery time determined by the capacitor C3 and the resistor R5, turning it on. Hold. When capacitor C3 is completely discharged,
TR2 is cut off, capacitor C2 starts charging, and transistor TR1 is turned off.
The electromagnet MG is turned on, a discharge circuit is formed, and the electromagnet MG operates in the same manner as in FIG. 1, and the following description will be omitted.

Note that the delay time of the timer circuit is determined by C3 and resistor R5.
Needless to say, you can freely set the settings.

As explained above, according to the present invention, when a telephone is equipped with a button automatic recovery device and a hooking service such as a telephone service is received, the delay recovery time is longer than the hooking time required to receive the service. If you do this, you will be able to use the locking service without the key being restored due to the locking operation.
It can be accepted without any problems, and the disadvantages of conventional methods such as substituting one of the push-button electric keys for a foot switch, removing the function, and providing a special switch etc. are eliminated, It is economically inexpensive, prevents loss of functionality, is easy to operate, and does not impair appearance, and its effects are extremely large and practically useful.
Further, although the present invention has been described using a transistor as a semiconductor element, the present invention does not depart from the present invention even if other semiconductor elements such as a thyristor are used.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing an example of an automatic button recovery device for a button telephone according to the present invention, and FIG. 2 is a more detailed circuit diagram of FIG. 1. In the drawing, TM
is a timer circuit, HS is a switch, TR1,
TR2 is a transistor, MG is an electromagnet, D1~D
5 is a diode, R1 to R6 are resistors, C1 to C3
indicate capacitors, respectively.

Claims (1)

[Claims for Utility Model Registration] A first capacitor that is charged when the switch is in operation, a first semiconductor element that constitutes a discharge circuit for the first capacitor, and a first capacitor that is charged when the switch is in an operating state; a first diode which prevents the electromagnet from operating; and a second diode which is charged when the switch is in the recovery state and causes the first semiconductor element to operate with the charging current of the capacitor.
a second semiconductor element that discharges the second capacitor during operation of the switch, and a discharge current of the first capacitor that
In the button automatic recovery device, the button automatic recovery device is equipped with a second diode that prevents current from flowing into the semiconductor element of the switch, and an electromagnet that operates to recover the button using the discharge current of the first capacitor when the switch is recovered, a third capacitor that is charged when in an operating state, becomes a discharge state when the switch is restored, and delays the restoration of the second semiconductor element in operation for a certain period of time by the discharge current of the capacitor; . A third diode that prevents the discharge current of the third capacitor from flowing to the second diode. An automatic button recovery device for a button telephone set.