JPH04125800A - Stray child preventing device - Google Patents

Abstract

PURPOSE:To prevent the generation of a stray child in advance by providing a base unit and a slave unit, providing the radio transmitter of fine transmission power in the slave unit and providing a receiver and an announcing means, which announces the strength of a signal received from the slave unit, in the base unit. CONSTITUTION:A base unit 1 is provided to be carried by a partner, and a slave unit 2 is provided to be carried by the child to be confused in getting lost. The base unit 1 inputs an incoming call signal to an antenna 3 through a receiver 4 to a code decoder 5, analyzes it at that site and operates an announcing means 6 when no signal is not received from the slave unit 2 as the result. The slave unit 2 is equipped with a transmitter 7 and an antenna 8 for transmitting weak radio waves and a code generator 9, which modulates a carrier by a specified code signal, is connected to the transmitter 7. Thus, it is detected that the child or the like is away from the partner, and by announcing it, the generation of the stray child can be prevented in advance.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for preventing children from getting lost, and for example, to a device for preventing children from getting lost by notifying when an infant or an elderly person is separated from a caregiver. .

(Prior art) In crowds where large numbers of people frequently come and go, such as in parks, amusement parks, or department stores, attendants must use Shinkaru to prevent children and elderly people who lack the ability to judge situations from getting lost. However, caregivers often lose sight of infants and others and search for them, and during this time, infants may drown in rivers or be taken away by strangers, or elderly persons may fall down or be involved in traffic accidents. I often have the misfortune of encountering this. There is a need for a system that can quickly find lost children in such cases.

However, as a method to prevent children from getting lost, multiple receiving devices are scattered in department stores, parks, etc., and infants and others are made to carry transmitters with very low transmission power, so that the individual information emitted from each transmitter can be transmitted to the Although it is possible to consider a system that monitors the location of the person carrying the transmitter by detecting it with a receiver, this only works in a specific and limited range, and there is no effect that it will work anywhere. There was no such system in the past. For this reason, when carrying an infant over a wide area, the only option available is to have the infant carry a leash, which poses the problem of the leash getting in the way and causing a nuisance to other members of the public.

Also, in the case of an elderly person, it was impossible to give him a leash, so there was no fundamental solution.

(Purpose of the Invention) The present invention has been made in view of the above-mentioned circumstances, and is intended to prevent the occurrence of lost children by detecting and notifying when an infant or the like has moved away from an attendant. An object of the present invention is to provide a lost child prevention device that makes it easy to find an infant or the like in the event that the child becomes lost.

(Summary of the Invention) In order to achieve this object, the device for preventing lost children according to the present invention includes a handset including a wireless transmitter with a minute transmission power, a receiver that receives a signal from the handset, and a receiver with a predetermined received signal strength. The main unit includes a first notification unit that notifies you when the value falls below a set value.

Further, the master device according to another embodiment of the present invention has a second notification means for notifying when the received signal strength exceeds a predetermined setting value, and a switch for switching between the first and second notification means. It is characterized by including.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example.

FIG. 1 is a block diagram showing one embodiment of the present invention.

In the figure, numeral 1 is a master device carried by a caregiver, and numeral 2 is a child device carried by people who do not want their children to get lost, such as infants and the elderly. The parent fill inputs the incoming signal to the antenna 3 to the code decoder #t & 5 via the receiver 4 and analyzes it at the chain part, and as a result, when the signal from the handset 2 is no longer received, the notification means 6 is activated. Configure it to work.

Further, the handset 2 has a transmitter 7 and an antenna 8 for transmitting weak radio waves, and is connected to the transmitter 7 with a code generator 9 capable of modulating a carrier wave with a specific code signal.

The communication distance between base unit 1 and slave unit 2 varies depending on the frequency used, transmission power, etc.;
50MHz, radio wave format FM, transmission power several mW, length 3c
50 to 100 when using a helical antenna of about m.
It is about m.

Next, the operation of the device for preventing lost children according to the present invention will be explained. The cordless handset 2 generates a predetermined code at predetermined time intervals, for example, once every several seconds, using its code generator 9, and transmits it via the transmitter V&7 and the antenna 8.

The parent v&1 constantly receives the signal from the handset 2 with its receiver 4, and monitors the handset 2 by checking the presence or absence of the signal and whether the code matches a predetermined one.
If the distance between base unit 1 and slave IJ12 is close, base unit 1 will be connected to slave unit 2.
Since the code matches the predetermined code, it is determined that there is no abnormality, and monitoring is continued without activating the notification means 6.

Now, an infant or the like who owns handset 2 moves away from base unit 1, and
At j&1, if the signal from the handset 2 is not received for a certain period of time or if the codes are not matched, it is determined that there is an abnormality, and the notification means 6 is activated. Notification means 6
For example, something that generates an alarm sound is convenient because it attracts the attention of the attendant. As a result, the attendant who hears this sound can immediately start looking for the infant after learning that the infant has gone far away, thereby preventing the infant from encountering an unexpected accident.

By the way, when the distance between base unit 1 and slave unit 2 increases and an alarm is issued from base unit 1, the caregiver will know that the child has gone far away, but once the caregiver knows this, Since an alarm is not required, the main unit 1 is normally turned off to stop the alarm. Then they went around looking for children, etc.
If you turn on the main unit 1 again in a place where a child or the like is likely to be present, and if the alarm sounds at that location, it can be determined that the handset 2 is far away, and if it does not sound, it can be determined that the handset 2 is nearby.

However, it is cumbersome to operate the switch on base unit 1 while searching for child V&2, and parents who are looking for their child may get upset and make a mistake in operating the switch when the switch is not turned on. There is also a possibility that children may be mistakenly believed to be nearby because the alarm does not sound in that case. Therefore, the present invention may be modified as follows.

FIG. 2 is a block diagram showing a modified embodiment of the present invention.

In the figure, the handset 2 is exactly the same as the above embodiment, and the transmitter 7
, an antenna 8 and a code generator 9, and the base unit 1 also has an antenna 3, a receiver 4, a code decoder 5, and a notification means 6. However, in this modified embodiment, the base unit 8! It is characterized in that a second notification means 10 and a changeover switch 11 are provided.

To explain this operation, the operation from when base unit 1 and slave unit 2 are separated until base unit 1 generates an alarm is the same as in the previous embodiment.

Next, after the alarm sounds, switch 1 on the base unit.
Switching to 1 will stop the alarm. Then, the base unit 1 is always in a reception standby state, and contrary to the above embodiment, the second notification means 10 does not operate while a signal from the slave unit 2 is not received, and an alarm occurs when a signal from the slave unit 2 is received. occurs.

In other words, when the person carrying the base unit 1 learns that the handset 2 has moved far away, the person carrying the base unit 1 should look around for a child carrying the handset. When it enters the communication range again, the predetermined signal is input to the receiver 4, and the code analysis 8
At &5, it is confirmed that the code matches a predetermined code. Therefore, if the alarm is generated again at this time, it will be known that the child has approached the desired slave unit 2, which is very convenient for finding a lost child.

The present invention may be modified in various ways other than those described above.

For example, if a tone is generated instead of the code, an oscillator such as DTMF may be used instead of a code generator, and an audio filter may be used instead of a code decoder, thereby simplifying the circuit configuration.

Further, by preparing a plurality of slave units and setting each code to be different, one FF unit may monitor the plurality of slave units.

Furthermore, the detection level of the received signal may be made variable. For example, if there is a large crowd and you want the alarm to sound as soon as an infant or other child moves away from the caregiver, the detection level should be set high; conversely, even if there is a small crowd and the infant or other child moves a little further from the caregiver, the alarm will sound. If you don't need it to sound, you can lower the detection level. As a means for adjusting the detection level, for example, an attenuator that can increase or decrease the amount of attenuation may be inserted between the antenna 3 of the base unit 1 and the receiver 4 or between the receiver a 14 and the decoder 5. Modifications may also be made. In the example as well, the detection level may be set low when roughly searching for the handset, and the detection level may be set high when the handset approaches.

Furthermore, warning means include sounds such as alarms and chimes,
It may be of various types, such as those that emit light such as light emitting diodes, or those that vibrate, or it may be possible to communicate using sound waves instead of radio waves, and these may be modified as appropriate to suit the usage pattern.

(Effects of the Invention) Since the present invention is configured and operates as described above, it is possible to detect when an infant or the like has moved away from an attendant,
In addition, by providing notification, it is extremely effective in preventing the occurrence of lost children, and in making it easier to find infants, etc., in the event that they become lost.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the lost child prevention system according to the present invention, and FIG. 2 is a block diagram showing a modified embodiment. 4......Receiver, 5......
・Code decoder, 6.10...Notification means,
7・・・・・・・・・Transmitter, 9・・・・・・・・・
・Code generator, 11... Changeover switch patent applicant
Toyo Tsushinki Co., Ltd. Diagram

Claims (2)

[Claims] (1) A handset including a wireless transmitter with very low transmission power, a receiver that receives a signal from the handset, and a first notification means that notifies when the received signal strength falls below a predetermined setting value. A device to prevent children from getting lost, consisting of a parent unit and a main unit. (2) The main device has a second notification means that notifies the user when the received signal strength exceeds a predetermined setting value, and includes a switch for switching between the first and second notification means. A device for preventing children from getting lost according to claim 1.