JPS5921575Y2 - Call time notification alarm - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a call time notification alarm that automatically issues an alarm when the call time exceeds a preset time.

Even if you try to independently manage the call time on your phone,
In the past, there was no special dedicated device; at most, each person used a general-purpose timer based on a mechanical or other principle that they had at hand, and when they made a call, they could know the passage of time by pressing the start button, and then they could keep track of the duration of the call. There was simply free management.

However, these methods were highly voluntary and had little practical effect.

The present invention was developed in view of these circumstances, and its purpose is to simultaneously remove the handset and receiver to make a call.
The timer circuit starts operating regardless of the caller's will, remains in operation until the caller puts down the handset, and issues an alarm after a predetermined period of time has elapsed. To provide a call time notification alarm which can effectively self-manage the call time by preventing a timer circuit from operating even if the call time is picked up.

That is, the present invention provides an alarm that includes a notification device and a timer circuit that controls the notification start operation, and a ring sensor that detects the ringing sound of a telephone and converts it into an electrical signal, and a It has a hold circuit that holds the output from the sensor, and a proximity switch that is attached to the phone body and detects whether the handset is attached or removed, and a signal indicating that there is no ringing sound from the hold circuit and the handset that is activated by the proximity switch. and a signal indicative of a pick-up operation to start the time counting operation of the timer circuit.

Hereinafter, the present invention will be explained in detail based on the drawings.

FIG. 1 is an explanatory diagram of the appearance of an embodiment of the call time notification alarm according to the present invention.

The device consists of a flat box 1 containing a necessary power supply and electronic circuit, and a proximity switch 2.

The box 1 is large enough to allow a telephone to be placed on its upper surface, and has a battery storage section 4 into which a dry battery 3 serving as a power source can be easily attached.

A sounding body 5 and a ringing tone sensor 6 are attached to the inner upper surface of the box 1, respectively.

The proximity switch 2 consists of a reed switch part built into the upper part of a fixture 7 having a U-shaped cross section, a fixed magnet, and a magnet 10 having a strength that cancels out the magnetic field of the fixed magnet.

The reed switch section is connected to an electronic circuit inside the box by a lead wire 11.

As shown in FIG. 2, the telephone 12 is placed on the box 1, the holder 7, which has a U-shaped cross section, is fitted into the carrying protrusion on the back of the telephone body, and the magnet 10 is attached to the handset. 1
It is used by being fixed to the grip part 3.

FIG. 3 is a block diagram of the electronic circuit built into the box 1.

The output from the ring sensor 6 is sent to a hold circuit 21 via an integrating circuit 20, and the output signal from the hold circuit 21 and the on/off signal from the proximity switch 2 are sent to a two-man AND circuit 22. .

The ringing sensor 6 is a narrow band piezoelectric microphone whose resonance frequency is adjusted to match the center frequency of the ringing sound of the telephone bell, and efficiently converts only the ringing sound of the telephone bell into an electrical signal.

The integration circuit 20 distinguishes between the signal caused by the ringing tone of the telephone bell and other noise, and the hold circuit 21 holds only the signal caused by the ringing tone of the telephone bell.

The output of this hold circuit 21 is normal/l/H (Nor
The signal is low (low level) when a signal from a bell ringer arrives.

Of course, it is also possible to use a normal hold circuit of normal low level and apply the output to the AND circuit 22 after inverting its output with an inverter.

The logical product output of the AND circuit 22 is sent to the switch circuit 23, which controls opening/closing of the power supply line of the timer circuit 24.

Here, the timer circuit 24 includes an integrating circuit 25 that is charged by a current supplied from a power source when the switch circuit 23 is closed, a reference voltage generating circuit 26 that generates an arbitrary predetermined voltage, and the integrating circuit 25 and a reference voltage generating circuit 26, and a switch circuit 28 that is opened or closed depending on the comparison result.

Therefore, the timer setting time in the timer circuit 24 can be set to an appropriate value by changing the charging time constant of the integrating circuit 25 and the output voltage of the reference voltage generating circuit 26.

The switch circuit 28 controls the start of operation of the oscillation circuit 30 of the sounding device 29, and the oscillation circuit 30 drives the buzzer sounding body 5.

Further, the on/off signal of the proximity switch 2 is sent to a monostable multivibrator 31, which generates a reset signal when the proximity switch 2 is turned off. 25
is applied to return them to their initial state.

Next, the operation of this device will be explained.

If you pick up the handset 13 to make a call,
Since only the magnetic field of the fixed magnet acts on the reed switch section, the proximity switch 2 is turned on and one input of the AND circuit 22 becomes H level.

The other input of the AND circuit 22 is the output of the hold circuit 21, which is normal H as described above, so
The output of the AND circuit 22 becomes H level and turns on the switch circuit 23.

Then, the timer circuit 24 starts its operation.

That is, the integrating circuit 25 is charged according to its charging time constant, and the terminal voltage of the capacitor gradually increases.

When the voltage exceeds the output voltage of the reference voltage generation circuit 26, the output state of the comparison circuit 27 changes and the switch circuit 28
Turn on.

Then, the oscillation circuit 30 is activated, and the buzzer sounding element 5 generates an alarm sound.

Therefore, when a predetermined period of time, for example 3 minutes, elapses while the user picks up the handset 13 to make a call, an alarm will be sounded.

When the handset 13 is returned, the magnet 10 attached to it will be removed.
The magnetic field of the fixed magnet is canceled out, and the proximity switch 2 is turned off.

Then, one input of the AND circuit 22 becomes L level, so the switch circuit 23 is opened.

Further, the charge accumulated in the integrating circuit 25 of the timer circuit 24 is discharged by the reset signal from the monostable multivibrator 31, and the integrating circuit 25 returns to its initial state.

Next, when a telephone call is received from outside, the ringing tone of the bell is detected by the ringing tone sensor 6, and the output of the hold circuit 21 is set to L level.

Therefore, even if the handset 13 is picked up, the output of the AND circuit 22 remains at L level and the switch circuit 23 remains open, so the timer circuit 24 does not operate.

When the handset 13 is returned to its original position, the monostable multivibrator 31 issues a reset signal in response to the off signal from the proximity switch 2, returning the hold circuit 21 to the normal H state, ie, the initial state.

In this embodiment, a magnetic proximity switch is used as the proximity switch, but a normal microswitch or the like may also be used.

Further, the notification device may be a sounding device, a light emitting device, or a combination thereof.

It is a hot theory that the mounting position of the proximity switch, the timer circuit, etc. can be changed as appropriate.

Furthermore, since this embodiment uses an AND circuit with a positive logic input, the configuration is such that the inverted positive logic output signal of the hold circuit or the negative logic output signal is input to the AND circuit. When using an AND circuit with a negative logic input, the positive logic output or the inverted negative logic output of the hold circuit may be input to the AND circuit.

In addition, in a timer circuit, for example, three reference voltage generation circuits and three comparison circuits are provided for one integration circuit, and the output of each comparison circuit is supplied to a monostable multivibrator to control a switch circuit. The oscillation frequency of the oscillation circuit, the intermittent period of oscillation, the voltage applied to the sounding body, etc. can be changed as the call time elapses.

So, for example, if the call time has passed for one minute, a "beep" will sound.
It is possible to make a single sound, "beep", an intermittent sound after 2 minutes, and a loud continuous sound after 3 minutes. Can be set to

Furthermore, it is also possible to switch the circuit simultaneously with the start operation of the timer circuit, use the ringing tone sensor as a buzzer sounding body, and generate an alarm sound when the set time of the timer circuit has elapsed.

Since the present invention is an alarm for informing call time configured as described above, as soon as the handset is removed to make a call, the timer circuit starts operating regardless of the caller's intention, and until the handset is put down. When a predetermined period of time has elapsed, an alarm is issued, and the timer circuit does not operate if a call is received from outside, making it possible to increase the effectiveness of independent management of call time, and also to manufacture it at low cost. ,
If you also take into account the reduction in telephone charges by using this device, it will be obvious that it is extremely practical.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of one embodiment of the device according to the present invention, FIG. 2 is an explanatory diagram showing its usage state, and FIG. 3 is a block diagram of an electronic circuit. 1...Box, 2...Proximity switch, 5...Sounding body, 6...Ringer tone sensor, 10...Magnet, 12...Telephone,
13...Telephone receiver, 22...AND circuit, 23...Switch circuit, 24...
Timer circuit, 29... Sound generation device.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. An alarm equipped with a notification device and a timer circuit that controls the notification start operation, and a ring sensor that detects the ringing sound of a telephone bell and converts it into an electrical signal; It has a hold circuit that holds the output of the ring sensor, and a proximity switch that is attached to the telephone body and detects whether the handset is attached or detached. An alarm for informing of call time, wherein the timer circuit starts a time counting operation by a logical product with a signal indicating an operation of picking up the handset by a switch. 2. The alarm according to claim 1, wherein the notification device is a sounding device. 3. The alarm according to claim 1, wherein the ringer sensor is a narrowband piezoelectric microphone, the resonance frequency of which matches the center frequency of the ringer. 4. The proximity switch is a magnetic proximity switch, in which a reed switch part and a fixed magnet are attached to the main body of the telephone, and a magnet strong enough to offset the magnetic field of the fixed magnet is attached to the grip part of the handset. The alarm according to claim 1 of the utility model registration claim, wherein the reed switch section is turned on when the object is picked up and turned off during standby.