JPS6224397A - Object separation alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an object separation alarm device that detects separation of objects using electromagnetic waves and issues an alarm when separation is detected.

(Problems to be Solved by the Invention) For example, when a traveler leaves his/her baggage unattended at a ticket counter etc., it is sometimes stolen.
Even in everyday life, people sometimes fall victim to being left behind. There was no appropriate way to deal with such ``displacement.''

Also, like a ``lost child,'' a child who is not in baggage may go somewhere while the parent is not looking, and in this case, it may take a lot of effort to find the child. There are things that need to be done.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a transmitter that is held in one object and that transmits an encoded identification signal unique to each object using electromagnetic waves as a medium. and a receiver that is held in the other object and receives the identification signal transmitted from the transmitter, and the receiver selects and receives only the identification signal from the paired transmitter. A receiving circuit, a level determining circuit that determines whether the strength level of the received signal received by the selected receiving circuit is below a preset reference level, and the level determining circuit determines the strength level of the received signal. K when judged to be below the standard level
, and an alarm circuit that generates an alarm.

(Function) For example, if a person has a transmitter and a receiver is attached to baggage, if the baggage is left behind and separated from the owner, the receiver will detect when the baggage is separated by a predetermined distance. When the intensity level of the received signal falls below the reference level, an alarm is issued and the surroundings are notified that a ``displacement'' has been carried out.

Furthermore, if the parent has a transmitter and the child has a receiver, an alarm will be generated if the child gets lost, thereby preventing the child from getting lost.

In addition, if you have two or more pieces of baggage, each baggage has one
By having a transmitter or receiver in your possession, you can generate an alarm even if one of your baggage gets separated.

Since a unique coded identification signal is used for each transmitter, there is no interference with signals from other transmitters, and since it acts as a key, a third party can Even if a signal is generated to stop the alarm operation of the receiver, the codes must match, and the anti-theft effect is great.

(Example) The configuration of one embodiment of the present invention is shown in FIG.

The transmitter 10 transmits a coded identification signal unique to each solid body using electromagnetic waves as a medium, and includes a code generation circuit 11, a modulation transmission circuit 12, an output adjuster 18, an antenna 14, and , power supply battery 15 and power switch 1
6.

The external size of this transmitter 10 is 5K, which is advantageous for carrying.

It is sized to fit in a pocket.

The code generation circuit 11 is a circuit that generates a unique code for each individual object set in advance.
K has been memorized.

The modulation transmission circuit 12 forms an identification signal according to the code generated from the code generation circuit 11, modulates the carrier wave,
This circuit transmits an electromagnetic wave signal including an identification signal from the antenna 14.

The modulation performed by this modulation transmission circuit 12 is FM.

Any suitable modulation method such as PM, AM, FOX, etc. is used.

For example, in the case of pulse modulation, the transmitted code is [11
01J, a signal as shown in FIG. 2(a) is transmitted.

Note that the modulation transmitting circuit 12 may be replaced by a circuit that generates signals of one or more different frequencies and determines the combination of frequency signals to be generated in accordance with the codes generated from the code generating circuit 11. It is possible.

That is, if the code is "1101" as above, as shown in FIG. 2(b), the frequency f of different tumors
By not generating the eighth frequency signal among the signals 1 to f4, the contents of the code can be transmitted.

The output regulator 18 is for adjusting the output intensity of radio waves.
It can be operated manually.

The receiver 20 receives the electromagnetic wave signal from the transmitter 10 and determines the magnitude of the intensity level of the received signal, and issues an alarm if the receiver 20 is more than a predetermined distance away from the transmitter 10. It is. This receiver 20 has an antenna 2
1, a demodulation receiving circuit z2, a code discrimination circuit 23, a level discrimination circuit z4, a drive circuit 25, an alarm 26, a power supply battery 27, and a power switch 28.

The demodulation receiving circuit 22 is a circuit that extracts the code component in the electromagnetic wave signal received by the antenna 21.

The code determination circuit 28 is a circuit that determines whether the extracted code is a predetermined code. That is, the same code as the unique code stored in the paired transmitter io is stored in advance in a memory such as a ROM, and the code included in the received signal and the code stored in the memory are stored in advance. Check whether the code matches the existing code.

The level determination circuit 24 is a circuit that determines whether the intensity level of the received signal is below a preset reference level, and this determination operation is performed by the code determination circuit 28, which This is performed only when the included code matches the code stored in the memory (hereinafter referred to as "the case where code matching is determined").

Therefore, the demodulation receiving circuit 22 and the code discriminating circuit 28 constitute a selective receiving circuit that selects and receives only the identification signals from the paired transmitters.

The drive circuit 25 activates a relay (a small type such as an electromagnetic relay or a semiconductor relay) to set an alarm when the level determination circuit 241C determines that the intensity level of the received signal is below a reference value. 26 (a buzzer or a small speaker equipped with an oscillator, etc.).

Next, the operation of this embodiment will be explained.

For example, when the device of this embodiment is used to prevent "misplacement", as shown in FIG. (using a method such as fixing the transmitter 1)
0 is in the possession of the baggage owner 80.

Then, the owner 80 turns on the power switches 16 and 28 of the transmitter 10 and the receiver 20 to operate the device (when not in use or when moving the baggage 40 away of the owner's will, the owner 80 turns on the power switches 16 and 28 of the transmitter 10 and the receiver 20, Alternatively, at least one of 28 may be turned off).

Furthermore, the owner 80 operates the output regulator 18 to adjust the transmission output level, thereby adjusting the sensitivity in the receiver/receiver 20. This allows the user to freely set the range in which the alarm is generated, that is, how far the baggage 40 must be away from the owner 80 before the alarm is generated.

By performing such operations, if the baggage 40 is left behind and the baggage 40 moves away from the distance set above, the received signal level at the receiver 40 will fall below the reference level and an alarm will be generated. ``Let the people around you know that you have been left behind.

In addition, when the device of this embodiment is used to prevent children from getting lost, the parent should have the transmitter 10 and the child should have the receiver 20.
By having the child carry the device, if the child moves beyond a certain distance from the parent, an alarm will be generated and the child will be notified of the child's location.

Furthermore, for example, if a plurality of pieces of baggage are placed together in one place and you are standing and talking, or if you are leaving relatively far away, each piece of baggage should accommodate the transmitter 10 or the receiver zO. If you leave one of your baggage,
If your baggage gets separated from other baggage due to being left behind or for some other reason, an alarm will be generated and you will be notified of its location.

In addition to the above-described applications, the present invention can be widely used for objects that need to be known apart from each other, such as people and things, people and people, and things and things.

Further, it is sufficient that the electromagnetic waves used for transmission are weak and are not subject to regulations under the Radio Law.

(Effects of the invention) As explained in detail above, the present invention has one of the following advantages:
A transmitter that is carried by an object and transmits a coded identification signal unique to each solid body using electromagnetic waves as a medium, and receives the electromagnetic wave signal from the transmitter and determines the strength level of the received signal. By configuring the receiver and the receiver that issues an alarm when the receiver is separated from the transmitter by a predetermined distance or more, the following effects are achieved.

For example, if a person has a transmitter and a receiver is attached to baggage, when the baggage is left behind and separated from its owner, the signal received by the receiver will be interrupted when the baggage is separated by a predetermined distance. When the intensity level falls below the reference level, an alarm is issued and the surrounding area is notified that a "displacement" has been carried out.

Furthermore, if the parent has a transmitter and the child has a receiver, an alarm will be generated if the child gets lost, thereby preventing the child from getting lost.

Furthermore, if you have two or more pieces of baggage, each
By having a transmitter or receiver in your possession, you can generate an alarm even if one of your baggage gets separated.

Since each transmitter uses a unique encoded identification signal, there is no interference with signals from other transmitters, and since it acts as a key, third parties can receive similar signals. Even if an attempt is made to generate a signal and stop the alarm operation of the receiver, the codes must match, which is highly effective in preventing theft.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention; FIG. 2 is a waveform diagram showing an example of an identification signal transmitted from the transmitter in FIG. 1; FIG. It is a schematic diagram showing an example of use of the above-mentioned embodiment device.

Claims (1)

[Claims] 1. A transmitter held in one object and transmitting a coded identification signal unique to each solid body using electromagnetic waves as a medium; and a transmitter held in another object and transmitted from the transmitter. a receiver that receives an identification signal from a paired transmitter, and a selection receiving circuit that selects and receives only an identification signal from a paired transmitter; a level discrimination circuit that determines whether the intensity level of the received signal is below a preset reference level; and when the level discrimination circuit determines that the intensity level of the received signal is below the reference level,
An object separation alarm device comprising: an alarm circuit that generates an alarm. 2. The object separation warning device according to claim 1, wherein the transmitter includes an output adjustment circuit for manually adjusting the intensity level of the transmitted signal. 3. The transmitter is carried by a person and the receiver is attached to baggage so that an alarm is issued when baggage is stolen. Object separation warning device.