JPS6184797A - Missingor, thief and lost property preventor - 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 In the field of industrial application, the present invention relates to a device for preventing loss or theft and for items left behind, particularly a device using weak radio waves or ultrasonic waves. It is possible for items to be left behind or lost in vehicles such as trains, buses, taxis, telephone booths, restrooms, etc. on the way, or at places visited, and the number of lost items is enormous. In addition, thefts of belongings placed on racks while reading or taking a nap on trains, etc., are also occurring frequently.Furthermore, it is necessary to prevent children from getting lost in amusement parks, crowded places, etc., and to keep an eye on young children.
Conventionally, these measures, such as safety protection, have only been limited to requiring everyone to be extremely careful, and calling for prevention of forgotten items through public announcements on trains and public announcements. However, I have often experienced that it is not very effective.

As a means of solving this problem, the present invention has been devised to prevent loss or theft, which frequently occurs on a daily basis, and a device for preventing left behind items, and uses the following means.

That is, a small transmitter that uses all media such as weak radio waves, ultrasonic waves, or guided radio waves is attached to the desired equipment, and a receiver that receives the signals emitted by these devices is placed in a pocket or somewhere in your clothes. The device is placed on the body of the person concerned, and the signal emitted by the transmitter is adjusted so that the distance from the device to the receiver is, for example, several meters, and both the transmitter and receiver are connected at a distance greater than the communicable distance. When the person moves away, the receiver is made to notify the person by emitting an activation signal using an amplitude.

By doing this, for example, if someone forgets to put something on the rack of a train, etc. and leaves the place to get off the train, or while taking a nap, a small transmitter can be accidentally or intentionally left behind. If the distance is greater than the above-mentioned communicable distance in order to prevent the force attached to the entire aircraft from being carried away, the receiver detects this nf and issues an activation signal based on the amplitude. Unlike sending an alarm using an alarm sound, in this case, you do not have to notice the other person and run the risk of being in danger, and at the same time, you do not have to be aware of the people around you.

Therefore, if you do not emit an alarm sound, you will not be able to get a sense of direction.Since no sound is emitted, only you will be able to understand the signal, so there is no problem using the amplitude as an activation signal even from the shortest distance. Depending on the situation, the action of radio waves may not be effective, but in the case of an activation signal based on amplitude, by receiving the signal fairly strongly, even if it overlaps with the action of ultrasonic waves or induction radio waves depending on the situation, the amplitude will be adequate. The activation signal is given by
It can be used without losing its functionality.

Therefore, the person in question can be aware of this, prevent forgetting something, and avoid theft.

(1) Examples Hereinafter, the present invention will be explained in detail based on illustrated examples.

FIG. 1 (al and (bl) are block diagrams showing one embodiment of a small transmitter and receiver used in the present invention.

In the same figure (al), O8C is an excavator, and this output signal is applied to the amplitude oscillators A, , OSC in the modulator MOD.
After the output signal is superimposed and subjected to necessary amplification, it is transmitted from the antenna A NT +.

On the other hand, the receiver that receives all the signals, as shown in FIG.
The amplitude signal contained in the signal guided to the detector DBT via tilPZ is detected by the filter FIL, and when not all of the amplitude signals are detected, the amplitude circuit ALT in the next stage is driven to issue an amplitude activation signal.

The entire invention can be easily carried out using the transceiver thus constructed.

It should be noted that the transmitter/receiver used in the present invention is not limited to the example described above, and may have any configuration, and its radio wave type may be AM, FM, or any other type. I can understand.

In addition, in order to use it more conveniently, please use the following.
' You may complete the process.

That is, a circuit for resetting the above-mentioned amplitude transfer money is newly provided in case a trunk or the like in which the present invention is implemented is placed on an electrician's net rack or the like and needs to be removed from the vicinity.

A complete block diagram of this embodiment is shown in FIG. That is, when a new reset circuit RAT is installed in the amplitude circuit ALT of the receiver 1 shown in FIG.
iReset.

Further, a portion of the output of the filter F''IL is manually inputted to the corresponding set circuit R8T, so that when a call is received again after there is no incoming call, a required signal is generated at the output of the filter circuit FIL. It is configured to cancel the above-mentioned reset function.

This simplifies the operation when moving to a place where there is no incoming electric field for a short time and returning to the place where the string was placed again, making it more convenient.

(2) Effects of the Invention Since the present invention is constructed and functions as explained above, it is extremely effective in preventing loss, forgetting, or theft of items when attached to items that are carried. .

Additionally, various functions may be added to the transmitter/receiver used in the present invention, such as adding a function to check whether or not it is making a normal operating sound, or adding a function to check the capacity of the battery used, etc. Or, it is easy to think of ways to make these devices more compact.

[Brief explanation of the drawing]

FIG. 1 (al and (bl are the metal values of an embodiment of the transmitter and receiver used in the present invention, respectively. Block diagram, WJ2
The figure is a block diagram showing another embodiment of the receiver used in the present invention. O20...Oscillator, MOD...Modulator. AMP+ and AMP2...Amplifier. A・O20...Amplitude oscillator. ANT+ and ANT2...Antenna. DET...Detector, FIL...Filter. ALT...Amplitude circuit, R3T...Reset circuit, SW...Suinochi

Claims (3)

[Claims] (1) In a transmitting/receiving device system consisting of one or more small transmitters having minute transmission power and one receiver that receives the signals transmitted by the transmitters, an item for carrying the small transmitters by a person. When the receiver is attached to a person's pocket or clothing, and the distance between the two is large, the signal emitted by the small transmitter is A device for preventing loss, theft, and left behind items, characterized in that when the receiver does not receive a call, or when the number of inputs is less than a set value, the device is configured to notify the person by making an activation signal with a predetermined amplitude. (2) The device for preventing loss, theft, and left behind according to claim (1), wherein the communication medium of the small transmitter and receiver provides an activation signal by amplitude using ultrasonic waves or induced radio waves. . (3) By applying the required modulation to the communication medium between the transmitter and the receiver and making it possible to change the modulated signal arbitrarily, it is possible to control one's own communication system when many similar communication systems coexist. A loss or theft prevention device and a device for preventing items left behind as claimed in claim (1) or (2), characterized in that the device is designed to be distinguishable from others.