JPS5936053Y2 - Intercom device with call notification function - Google Patents

Description

[Detailed description of the invention] The present invention relates to an intercom device with a call notification function, and more particularly, an intercom device with a call notification function that sends a call notification sound to the other party at the start of a call by using a recovery switch that works with a channel selection switch. It is related to.

Conventionally, when one device selects a desired station II, to prevent the second device from being eavesdropped on the I device without the user's knowledge, the relay is set to a certain level according to the operation of the channel selection switch from one device. There is known an intercom device which is operated for a time to switch its contact to the transmitting side and sends a signal from an oscillator through an attenuation circuit to a II machine as a call warning tone (Japanese Utility Model Publication No. 12091/1983).

However, in this type of intercom device,
As a channel selection switch, one of the contacts of two circuits is connected in parallel, and the common terminal of one is connected to the power supply, and the other common terminal is connected to the relay and warning sound generator via a capacitor. However, there were problems in that the configuration of the tuning switch with two points was complicated, and the time-limiting characteristics due to the capacitor lacked stability.

This invention was devised as a result of intensive research to solve the above-mentioned difficulties.In response to the operation of the channel selection switch from one device, a relay is activated for a certain period of time, the contact is switched to the transmitting side, and the oscillator is activated. In an intercom device with a call notification function, which sends a signal from a monostable multivibrator through an attenuation circuit to a II device as a call notification sound, a trigger is applied to a monostable multivibrator via a recovery switch that works with the channel selection switch, and the monostable multivibrator is activated. It is an object of the present invention to provide an intercom device with a call advance function in which the contact is switched to the transmitting side and the oscillator and the attenuation circuit are energized by an output having a constant period from a vibrator.

Hereinafter, the intercom device with call advance function of the present invention will be described in detail based on the drawings.

The figure shows the circuit of a parent-child intercom device as an example of the intercom device with a call advance function according to the present invention.
The monostable multivibrator 1 to which a trigger is applied by the recovery switch SW1 interlocked with the monostable multivibrator 1 and the contact RY2-
1, a relay RY2 as a switching device for switching RY2-2 to the transmitting side, and a relay RYl as a switching device for operating an oscillator 2 and an attenuation circuit 3 energized by the output.

Monostable multivibrator 1 has resistors R1, R2゜R3
, R4, Rs, Rs, R7,) transistor Q1
．． Q2 consists of capacitors C1, C2, and diode D1, and transistors Q1. The collectors of Q2 are connected to the + side of the power supply via resistors R1 and R2, and the base of transistor Q2 is connected to the power supply by a recovery switch SW1.
+ via resistor R5, capacitor C2, and diode D1
The trigger is applied from the side.

A drive circuit 5 that energizes and deenergizes the relay RY2 by the output having a constant period from the monostable multivibrator 1,
Transistor Q3, resistors R8, R9, R19°R2o,
It is composed of a capacitor C3 and a diode D2.

Transistor Q2 in monostable multivibrator 1
The collector of is connected to the base of the transistor Q3 of the drive circuit 5 via a diode D2 and a resistor R2o.

On the other hand, the + side of the power supply is connected to the resistor R via the recovery switch SW1.
8. It is configured to be applied to the ground side through the capacitor C3.

Note that D4 is a surge absorption diode of relay RY2.

In order to energize and de-energize relay RY1, drive circuit 6
It is composed of a transistor Q6 and a resistor R1□, 18.

Transistor Q1 in monostable multivibrator 1
The collector of is connected to the base of the transistor Q6 of the drive circuit 6 via a resistor R17, and the relay RY1 is connected between + and - of the power supply via the transistor Q6.

Note that D3 is a diode for absorbing surge of relay RY1.

Oscillator 2 includes capacitors C4, C5, C6, and resistor R1o.
.

It is constituted by a phase-shifted oscillation circuit consisting of R11, R12, R13 and a transistor Q4, and the collector of the transistor Q4 is connected to the + side of the power supply from a contact RY1-1 closed by a relay RY1 via a resistor R1o.

Attenuation circuit 3 includes resistors R14g R159R16, R21
9R22, a capacitor C7, and a transistor Q5, and the output of the oscillator 2 is input to the emitter of the transistor Q5 in the attenuation circuit through a resistor R.

The base of transistor Q5 is resistor R2□, relay RYl
The contact RY1-2, which is closed by is being charged through.

The output of the attenuation circuit 3 is connected to the amplifier 4 via the capacitor C8.
is applied to.

Note that SP is a microphone and a speaker.

II units (slave units) Il, , IL... are each operated by the channel selection switch S1. From S2..., terminals T1, I2...
..., individual line 11, I2..., terminal T'l, T
'2..., microphone and speaker SP1, SP2.
It is configured by being connected to...

Note that the calling circuit from the II machine to the first machine is omitted and not shown for convenience of explanation.

Moreover, the call switch SW2 is operated to always shut off the drive circuit 5, deenergize the relay RY□, and switch the contacts RY2-1 and RY2-2 to the transmitting state. It is something.

In the intercom device with a call advance function of the present invention configured as described above, in the standby state, the base of the transistor Q1 in the monostable multivibrator 1 is biased from the + side of the power supply via the resistors R2 and R4. O
N, transistor Q2 is OFF.

Since transistor Q1 is ON, no bias current flows to the base of transistor Q6 of drive circuit 6, so it is turned OFF, and relay RY1 is deenergized and its contact RY
1-1 and RYl-2 are located at the solid line in the diagram,
Therefore, the oscillation circuit 2 and the attenuation circuit 3 have stopped operating, but the capacitor C7 is connected from the + side of the power supply to the resistor R2□ and the contact R.
It is charged by the path leading to one side via Y1-2.

On the other hand, in the standby state, transistor Q3 in drive circuit 5 is not biased and is OFF, relay RY2 is deenergized, and contacts RY2. .

RY2-2 is located at the position shown by the solid line.

Now, when you operate the channel selection switch S1 (downward as shown in the diagram) to talk to the machine, the recovery switch SW1 is switched (upward as shown) in conjunction with this, and the power supply is turned on. Power is supplied to the amplifier 4 from the + side, and the base of the transistor Q2 in the monostable multivibrator 1 is connected to the resistor R5, the capacitor C2, and the diode D1.
A trigger is applied through to reverse the operation in transistors Q1, Q2 of the monostable multivibrator.

When the recovery switch SW1 is switched in conjunction, current is applied from the + side of the power supply via the switch to the base of the transistor Q3 of the drive circuit 5 via the resistors R8, R9, and R2o, but this is not connected to the capacitor. Because of the delay caused by C3, the operation of the monostable multivibrator as described above is reversed and the negative collector output from transistor Q2, which is turned on, passes through diode D2 and resistor R2o before transistor Q3 turns on. is supplied to the base of the transistor Q3 of the drive circuit 5, and continues to maintain the OFF state for a fixed period of the monostable multivibrator.

As the operation of the monostable multivibrator as described above is reversed and transistor Q1 is turned off, transistor Q6 of drive circuit 6 is turned on, energizing relay RY1 and opening its contacts RY1-2 and RYl-2. Switch to the dotted line position as shown.

The oscillator 2 is therefore energized and its output is transmitted to the damping circuit 3
The discharge current of the time-limiting capacitor C7 in the resistor 21
is applied to the base of the transistor Q5, which is energized for a certain period of time.

As a result, the output of the transistor Q5 is given an attenuation characteristic, and the signal is sent to the amplifier 4 via the capacitor C8.
is input to.

The output signal from the amplifier 4 is emitted by the microphone/speaker SP1 via the contact RY2-2, the channel selection switch S1, the terminal T1, the individual line 10, and the terminal T'1.

When the certain period of operation of the monostable multivibrator has elapsed, transistor Q1. Q2 reverses again,
are turned ON and OFF, respectively, so the transistor Q6
turns OFF, relay RY1 is deenergized, and its contact R
Y1-1 and RYl-2 switch to the position shown by the solid line,
While cutting off the oscillator 2 and damping circuit 3, the capacitor C
At the same time, the secondary bias applied from the transistor Q2 through the diode D2 and the resistor R2o disappears, so the recovery switch SW1 and the resistor R
8, R9, R2o, transistor Q3 is turned on, relay RY2 is energized, and its contacts RY2-1. RY2-2 is switched to the position indicated by the dotted line in the figure to receive a call.

In this state, from the machine to the microphone and speaker SP1
The audio from terminal T'1, individual line 10, terminal T1
, one microphone/speaker SP via the tuning switch S1, contact RY2-1, amplifier 4, and contact RY2-2.
The sound will be emitted at

Here, one machine is Il, and to send a call to the machine, operate the call switch SW2 (downward as shown), and a reverse bias is constantly supplied to the transistor Q from one side of the power supply via the resistor R2o. Therefore, transistor Q3 is turned off, relay RY2 is deenergized, and its contacts RY2-1. RY
2-2 is switched to the transmitting state shown by the solid line in the figure, and the microphone/speaker SP is connected to the capacitor C8 and the amplifier 4.
, contact RY2-2, channel selection switch S1, terminal T, individual line 11, and terminal T'1, the sound is emitted from microphone/speaker SP1.

Even when one machine operates the channel selection switch S2 to talk to the second machine ■I, the operation is similar to that described above, so a description thereof will be omitted.

As is clear from the embodiments described above, according to the present invention, a trigger is applied to a monostable multivibrator as a timer via a recovery switch interlocked with a channel selection switch, and a constant cycle of this monostable multivibrator is set. Since the signal from the oscillator is sent through an attenuation circuit to the other station as a call warning tone using an output with It is possible to reduce costs, and to save labor in wiring work during implementation.

In addition, when the relay contact is switched to the sending state and held for a certain period of time in order to send out a call warning sound to the other station, the monostable multivibrator output with a certain period is triggered by a recovery switch that works with the tuning switch. is used to de-energize the relay and switch its contacts to the sending state, while energizing the oscillator and damping circuit.
The time limit characteristic for sending out the call notification sound becomes accurate and reliable, and reliability is also improved.

[Brief explanation of drawings]

The figure is a circuit diagram showing an embodiment of an intercom device with a call advance function according to the present invention. SL, S2...Tuition selection switch, SWl...
...Recovery switch, RYl...Relay, RY2
...Relay, RYl. RYl-2...Contact, RY2-1, RY2-2
...Contact, 11901. . Monostable multivibrator, 2...Oscillator, 3
0000. . attenuation circuit.

Claims (1)

[Scope of utility model registration request] An intercom with a call notification function that activates a relay for a certain period of time in response to the operation of the channel selection switch from the first device, switches the contact to the calling side, and sends the signal from the oscillator through an attenuation circuit to the second device as a call warning tone. The device includes: a monostable multivibrator to which a trigger is applied by a recovery switch interlocking with a tuning switch; a switching device that switches the contact to a transmitting side by an output having a constant period of the monostable multivibrator; and the output. 1. An intercom device with a call advance function, comprising: a switching device that operates the oscillator and the attenuation circuit.