KR100483002B1 - Wireless apparatus for a missing child prevention - Google Patents

Abstract

The present invention relates to a wireless device for preventing the loss of infants so that they can always manage the infants in real time, comprising: a plurality of infant wireless terminals wirelessly transmitting unique identification information and a predetermined transmission power signal; And receiving unique identification information and transmission power signals from the plurality of infant wireless terminals, and calculating a distance proportional to the reception sensitivity of the infant wireless terminal using the transmission power signal as a reception sensitivity signal. If there is a deviation is provided with a guardian wireless terminal for the alarm, the guardian wireless terminal is possible to adjust the range for the safe area and to search for a predetermined range of the safe area, but farther than the safe area The plurality of infant wireless terminals receive an alarm signal that is wirelessly transmitted from the one guardian wireless terminal to alert the guardian and the infant when an infant leaving the safe area occurs. We prevent you from occurring and lose safety area There are effects that you can quickly find the children because you can browse to the location of the infant.

Description

Wireless apparatus for a missing child

The present invention relates to a wireless device for preventing the loss of children, and more specifically, to prevent the lost child to tell the safety area departure from the guardian in advance by using a signal transmission and reception with the transceiver attached to the infant and to indicate the departure of the safety area. It relates to a wireless device.

In recent years, each school, academy, or even pre-kindergarten has placed a greater emphasis on natural and experiential learning. By doing so, he has sought out of the frustrating classroom and is learning a lot outdoors.

By the way, the students who can perceive to some extent have little chance of thinking under the guidance of the teacher, but the children who are not or the lower grades of elementary school are not only able to control but also have a high probability of losing children.

Accordingly, there are currently various types of infant management systems, most of which are infant observation systems that manage in real time or tracking device systems that find infants in the event of an accident.

The infant observation system that manages in real time means a limited space, that is, a system for observing movement in the interior, which monitors the movement of a child in a nursery or academy at home or at home through the Internet from a distance. It plays a role, but rather has a drawback in that it does not function properly outside the risk of accidents.

In addition, the infant tracking device system is a system that is applied when a child is lost, and has a disadvantage in that it cannot be prevented in advance.

In addition, the conventional infant management system (or alarm) is a one-to-one system, and the reaction distance is only a few meters, so there is a problem that the efficiency is lowered.

The present invention has been proposed to solve the above-described problems, and an object thereof is to provide a wireless device for preventing the loss of infants that can always manage the infant in real time.

According to a preferred embodiment of the present invention, there is provided a wireless anti-lost device comprising: a plurality of infant wireless terminals wirelessly transmitting unique identification information and a predetermined transmission power signal; And receiving unique identification information and transmission power signals from the plurality of infant wireless terminals, and calculating a distance proportional to the reception sensitivity of the infant wireless terminal using the transmission power signal as a reception sensitivity signal. If there is a deviation is provided with a guardian wireless terminal for alarming,

The one guardian wireless terminal is capable of adjusting a range for the safe area, searching for a predetermined range of the safe area but searching farther than the safe area.

The plurality of infant wireless terminals are characterized by receiving an alarm signal transmitted wirelessly from the one guardian wireless terminal and performing an alarm.

According to another embodiment of the present invention, a wireless device for preventing a child includes a plurality of infant wireless terminals for wirelessly transmitting unique identification information and a predetermined transmission power signal; And receiving unique identification information and transmission power signals from the plurality of infant wireless terminals, and calculating a distance proportional to the reception sensitivity of the infant wireless terminal using the transmission power signal as a reception sensitivity signal. If there is a deviation is provided with a guardian wireless terminal for alarming,

The one guardian wireless terminal is capable of adjusting a range of the safety zone, and partitions the safety zone into a plurality of search zones, but moves away from the safety zone with a searchable distance farther from the safety zone. It is possible to automatically search for the existence of the terminal sequentially,

The plurality of infant wireless terminals are characterized by receiving an alarm signal transmitted wirelessly from the one guardian wireless terminal and performing an alarm.

Hereinafter, with reference to the accompanying drawings, a wireless device for preventing loss according to an embodiment of the present invention will be described.

1 is an overall configuration diagram illustrating a concept of a wireless device for preventing a child according to a first embodiment of the present invention, in which one guardian wireless terminal 10 and a plurality of infant wireless terminals 12, 14, 16, and 18 are shown. It consists of.

The plurality of infant radio terminals 12, 14, 16 and 18 periodically transmit a predetermined transmission power signal to the guardian radio terminal 10 wirelessly. At this time, each of the infant wireless terminals 12, 14, 16, 18 together with the assigned unique identification information (ID).

In addition, the plurality of infant radio terminals 12, 14, 16, 18 receive an alarm signal transmitted wirelessly from the guardian radio terminal 10 and generate an alarm (alarm sound generation, warning message display).

The guardian radio terminal 10 receives the unique identification information (ID) and the transmission power signal from the plurality of infant radio terminals 12, 14, 16 and 18, and then the infant radio terminal 12, 14, 16. , 18) calculate the distance proportional to the reception sensitivity by using the transmission power signal as the reception sensitivity signal, and if it leaves the preset safety area, an alarm (alarm sound, warning message display) is issued. .

In addition, the guardian wireless terminal 10 is not only capable of adjusting the range for the safe area, but also searches for a predetermined range of the safe area, but controls the operation of the search mode that can search farther than the safe area. .

FIG. 2 is a block diagram showing the configuration of a terminal for a guardian shown in FIG. The memory unit stores the unique identification information (ID) of the plurality of infant wireless terminals 12, 14, 16, and 18, the name of the holder corresponding thereto (i.e., the name of the infant), and reference distance information proportional to each reception sensitivity. (32); A plurality of infant wireless terminals 12, 14, 16, 18 receive wirelessly transmitted unique identification information (ID) and a predetermined transmission power signal, while leaving the safety zone 12, 14, An antenna (34) for wirelessly transmitting a predetermined alarm signal to at least one of 16 and 18; While filtering the unique identification information and the transmission power signal input through the antenna 34, amplifying the alarm signal to be wirelessly transmitted to at least one of the infant radio terminals 12, 14, 16, 18 outside the safe area. A filter 36; An RF module unit 38 for shaping and encoding a signal from the filter 36, while converting a predetermined alarm signal into an RF signal and sending the signal to the filter 36; Based on the encoded data from the RF module unit 38, the distance from the infant wireless terminal 12, 14, 16, 18 is calculated, and it is determined whether or not the set safe area is separated. In addition to the alarm box to control the alarm signal transmission to the wireless terminal (12, 14, 16, 18 at least one of the departure) from the safety zone, and if the search mode is specified to specify a specific range of the safety zone to search A microprocessor unit 40 for controlling an operation for searching to a far distance from the safe area; An alarm unit 42 which outputs a predetermined alarm sound under the control of the microprocessor unit 40; A display unit 44 for displaying information (for example, a name) on the infant wireless terminal 12, 14, 16, 18 which has left the safe area under the control of the microprocessor unit 40; And a warning message generating unit 46 for generating a predetermined warning message under the control of the microprocessor unit 40 and transmitting the predetermined warning message to the RF module unit 38.

Here, the key input unit 30 is provided with a button for selecting a mode for adjusting the safe area range, a button for designating a search mode, a numeric key, a button for inputting characters, and the like.

The antenna 34 is a dual antenna comprising an omni-directional antenna and a directional antenna, and the filter 36 may use a surface acoustic wave (SAW) filter or the like.

The RF module 38 wirelessly transmits a plurality of alarm signals through a plurality of channels (for example, about 20 to 50) using a specific frequency (for example, a frequency of 400 to 700 MHz). As a result, it is possible to simultaneously wirelessly transmit an alarm signal to a plurality of infant radio terminals (for example, up to 50) that have left the safety zone.

The microprocessor unit 40 may set (ie, vary) a distance of a specific radius (eg, up to 10 to 1000 m) from the guardian wireless terminal 10 as a safe zone. The safe area range may be arbitrarily set (ie, variable) by a guardian using the wireless terminal 10 by operating the key input unit 30.

In the first embodiment of the present invention, the searchable distance in the search mode is longer than the distance of the safe area. Under the search mode, directional antennas are mainly used.

FIG. 3 is a block diagram showing the configuration of the infant wireless terminal shown in FIG. 1 and is applied to all the infant wireless terminals 12, 14, 16, and 18 shown in FIG.

Each of the infant radio terminals 12, 14, 16, and 18 wirelessly transmits unique identification information (ID) and a predetermined transmission power signal to the guardian radio terminal 10, while the radio terminal 10 An antenna 50 for receiving an alarm signal wirelessly transmitted from the antenna; An RF amplifier 52 for amplifying the RF signal received by the antenna 50; A demodulator 54 for demodulating a signal output from the RF amplifier 52; A signal amplifier 56 for amplifying the signal output from the demodulator 54 by a predetermined level; On the basis of the signal from the signal amplifying unit 56, it is determined whether the safety zone is out of the safety zone, and in the case of leaving the safety zone, an alarm operation (for example, an alarm sound or a warning message is displayed) is controlled. A microprocessor unit 58 for controlling transmission of a transmit power signal to the unit 10; An alarm unit 66 for outputting an alarm sound under the control of the microprocessor unit 58; A display unit 68 for displaying a warning message under the control of the microprocessor unit 58; A transmission signal generator 60 for generating a predetermined transmission signal under control of the microprocessor unit 58; A modulator 62 for modulating a transmission signal output from the transmission signal generator 60; And an output unit 64 which amplifies the signal modulated by the modulator 62 and transmits the modulated signal to the guardian wireless terminal 10 through the antenna 50.

Next, operation of the anti-lost wireless device according to the first embodiment of the present invention will be described.

First, the guardian key-in information on the wireless terminal (eg, unique identification information (ID) and name) through the key input unit 30 before providing the wireless terminal to each infant. The keyed information is stored in the memory unit 32 under the control of the microprocessor unit 40.

The guardian then turns on the infant wireless terminal 12, 14, 16, 18 while providing each infant with the corresponding wireless terminal 12, 14, 16, 18. Preferably, the infant radio terminal 12, 14, 16, 18 is a necklace type terminal or a bracelet type terminal. Of course, other types of terminals may be used.

Then, the guardian sets the safety zone arbitrarily by operating the key input unit 30 after turning on the power of the guardian wireless terminal 10. Of course, if the safe area is not set by the guardian, the safe area range preset at the factory is used.

Thereafter, the antenna 34 of the guardian radio terminal 10 receives the unique identification information (ID) and the transmission power signal periodically transmitted from the respective infant radio terminals 12, 14, 16 and 18. do. In this case, isotropic antennas are mainly used. The received signal is input to the microprocessor unit 40 via the filter 36 and the RF module unit 38.

The microprocessor unit 40 determines whether the infant wireless terminal has left the safe area based on the input signal of each of the infant wireless terminals 12, 14, 16 and 18. As a result of the determination, if there is an infant wireless terminal that has left the safety zone, the microprocessor unit 40 controls the alarm unit 42 to output an alarm sound, and controls the display unit 44 for the infant who has left the safety zone. Display information (ie name). Then, the microprocessor unit 40 controls the warning message generating unit 46 to generate a predetermined warning message (for example, a short message such as "Go back too far"), and the generated warning message is an RF. The module unit 38 and the filter 36 are wirelessly transmitted to the infant wireless terminal that has escaped from the safe area through the antenna 34.

Accordingly, the antenna 50 of the infant wireless terminal that has left the safety area receives the RF signal containing the warning message. The received RF signal is input to the microprocessor unit 58 via the RF amplifier 52, the demodulator 54, and the signal amplifier 56. Since the input signal is a warning message, the microprocessor unit 58 controls the alarm unit 66 to generate a predetermined alarm sound, and controls the display unit 68 to return a predetermined warning message (for example, "too far away"). Short messages, such as "Come".

The infant who has left the safety zone moves to the guardian after confirming that he has left the safety zone by the warning sound displayed on the alarm unit 66 and the warning message displayed on the display unit 68.

If the infant who has left the safety area does not come to the place where the guardian is located, or if the guardian urgently seeks the infant, the guardian operates the key input unit 30 of the guardian wireless terminal 10 to search. Set the mode.

When a signal corresponding to the search mode setting is input to the microprocessor unit 40, the microprocessor unit 40 performs the search mode operation. In this case, a directional antenna is used.

In this search mode, when the guardian holds the guardian wireless terminal 10 and rotates the lens clockwise or counterclockwise by a predetermined angle, the search range of the directional antenna can be received (that is, searched farther than a preset safety area). It is possible, however, to receive unique identification information and transmit power signals from a wireless wireless terminal (e.g., 18) that has left the safety zone within a circular search zone without forming a circular search zone.

That is, even when the infant has left the safe area and the search mode is not set, the unique identification information and the transmission power signal from the wireless terminal of the infant are not received by the antenna 34 of the guardian wireless terminal 10. However, when the search mode is set, since the directional antenna is used, the radio wave reception distance is farther to receive the unique identification information (ID) and the transmission power signal from the wireless terminal of the infant away from the safe area. Accordingly, when the transmission power signal received by the guardian's wireless terminal 10 is received and the corresponding distance information is read from the memory unit 32, it is determined how far away the infant is from the safe area. Able to know.

On the other hand, in general, the mosquito (ie, the guardian's wireless terminal 10) sets the ID number where the infant or the object is located, and enables the position of the child (infant) in advance by using a search function. It may be.

FIG. 4 is an overall configuration diagram illustrating the concept of a wireless device for preventing a child in accordance with a second embodiment of the present invention. One guardian wireless terminal 100 and a plurality of infant wireless terminals 20, 22, 24, 26, 28).

The plurality of infant wireless terminals 20, 22, 24, 26, 28 periodically transmit a predetermined transmission power signal to the guardian wireless terminal 100 wirelessly. At this time, each of the infant wireless terminals 20, 22, 24, 26, 28 together with the assigned unique identification information (ID).

Further, the plurality of infant wireless terminals 20, 22, 24, 26, 28 receive an alarm signal wirelessly transmitted from the guardian wireless terminal 100 and generate an alarm (alarm sound generation, warning message display).

In addition, since the internal structure and shape of the plurality of infant radio terminals 20, 22, 24, 26, 28 are the same as the infant radio terminal of the first embodiment of the present invention described above, description thereof will be omitted.

The guardian wireless terminal 100 receives the unique identification information (ID) and the transmission power signal from the plurality of infant wireless terminals 20, 22, 24, 26, 28, and then the infant wireless terminal 20, 22. , 24, 26, 28) calculate the distance proportional to the received sensitivity by using the transmit power signal as the received sensitivity signal to determine how far apart it is. Display).

In addition, the guardian wireless terminal 100 is not only capable of adjusting the range of the safety zone, but also divides the safety zone into a plurality of search zones at equal intervals, but uses the searchable distance as a distance from the safety zone. Controls the automatic sequential search of the search for the existence of the baby wireless terminal that has left the area.

FIG. 5 is a block diagram showing the configuration of the guardian wireless terminal shown in FIG. Unique identification information (ID) of the plurality of infant wireless terminals 20, 22, 24, 26, 28, and corresponding holder name (i.e., infant's name) and reference distance information proportional to each reception sensitivity are stored. A memory unit 72; A plurality of infant wireless terminals 20, 22, 24, 26, and 28 receive unique identification information (ID) transmitted wirelessly and a predetermined transmission power signal, and the infant wireless terminal 20 (e. An antenna 74 for wirelessly transmitting a predetermined alarm signal to at least one of 22, 24, 26, and 28); The unique identification information and the transmission power signal inputted through the antenna 74 are filtered, and an alarm signal to be wirelessly transmitted to at least one of the infant radio terminals 20, 22, 24, 26, 28 outside the safe area. A filter 76 for amplifying; An RF module unit 78 for shaping and encoding a signal from the filter 76, while converting a predetermined alarm signal into an RF signal and sending it to the filter 76; The distance from the infant wireless terminal 20, 22, 24, 26, 28 is calculated on the basis of the encoded data from the RF module unit 78, and it is determined whether the set safe area is separated, and the safe area is determined to be out of the area. When a warning mode is specified, the alarm signal is sent to the wireless terminal (at least one of 20, 22, 24, 26, 28) that has left the safety zone. A microprocessor unit 80 that controls the operation of searching for a specific distance while searching for a distance from a corresponding safety area; A rotation driver 82 for rotating the antenna 74 by a predetermined time period under the control of the microprocessor unit 80; An alarm unit 84 for outputting a predetermined alarm sound under the control of the microprocessor unit 80; A display unit 86 that displays information (for example, a name) on the infant wireless terminal 20, 22, 24, 26, or 28 that has left the safe area by the control of the microprocessor unit 80. ; And a warning message generating unit 88 for generating a predetermined warning message under the control of the microprocessor unit 80 and transmitting the predetermined warning message to the RF module unit 78.

Here, the key input unit 70, the antenna 74, the filter 76, the RF module unit 78 is the key input unit 30, the antenna 34, the filter 36, the RF module of the first embodiment described above. It is the same as the structure of the part 38.

The microprocessor unit 80 may set a distance from the guardian's wireless terminal 10 to a radius of 10 to 1000 m as a saft zone. The safe area range may be arbitrarily set (ie, variable) by a guardian using the wireless terminal 100 by operating the key input unit 70.

In the second embodiment of the present invention, the searchable distance in the search mode is longer than the distance of the safe area, and each of the search areas shown in FIG. 4 (8 (more partitionable if necessary)) is divided at equal intervals. Under the search mode, directional antennas are mainly used, and sequential automatic search is performed from search area 1 to search area 8.

The rotation drive unit 82 includes a step motor to rotate the directional antenna a predetermined angle for a predetermined time period while the search mode is set by the control of the microprocessor unit 80.

Next, the operation of the anti-lost wireless device according to the second embodiment of the present invention will be described.

First, the guardian key-in information on the wireless terminal (eg, unique identification information (ID) and name) through the key input unit 70 before providing the wireless terminal to each infant. The keyed information is stored in the memory unit 72 under the control of the microprocessor unit 80.

The guardian then turns on the infant wireless terminal 20, 22, 24, 26, 28 while providing each infant with the corresponding wireless terminal 20, 22, 24, 26, 28.

Then, the guardian sets the safety zone arbitrarily by operating the key input unit 70 after turning on the power of the guardian wireless terminal 100. Of course, if the safe area is not set by the guardian, the safe area range preset at the factory is used.

Thereafter, the antenna 74 of the guardian wireless terminal 100 transmits a unique identification information (ID) and a transmission power signal periodically transmitted from each of the infant wireless terminals 20, 22, 24, 26 and 28. Receive In this case, isotropic antennas are mainly used. The received signal is input to the microprocessor unit 80 via the filter 76 and the RF module unit 78.

The microprocessor unit 80 determines whether the infant wireless terminal has left the safe area based on the input signal of each infant wireless terminal 20, 22, 24, 26, 28. As a result of the determination, if there is a baby wireless terminal out of the safe area, the microprocessor unit 80 controls the alarm unit 84 to output an alarm sound, and controls the display unit 86 to display information about the baby who has left the safe area. Display the name (name). The microprocessor unit 80 controls the warning message generating unit 88 to generate a predetermined warning message (for example, a short message such as "Go back too far"), and the generated warning message is an RF. Through the module unit 78 and the filter 76, the antenna 74 is wirelessly transmitted to the infant wireless terminal that has escaped from the safe area.

Accordingly, the antenna 50 of the infant wireless terminal that has left the safety area receives the RF signal containing the warning message. The received RF signal is input to the microprocessor unit 58 via the RF amplifier 52, the demodulator 54, and the signal amplifier 56. Since the input signal is a warning message, the microprocessor unit 58 controls the alarm unit 66 to generate a predetermined alarm sound, and controls the display unit 68 to return a predetermined warning message (for example, "too far away"). Short messages, such as "Come".

The infant who has left the safety zone moves to the guardian after confirming that he has left the safety zone by the warning sound displayed on the alarm unit 66 and the warning message displayed on the display unit 68.

If the infant who has left the safety area does not come to the place where the guardian is located, or if the guardian urgently finds the infant, the guardian operates the key input unit 70 of the guardian wireless terminal 100 to search. Set the mode.

When a signal corresponding to the search mode setting is input to the microprocessor unit 80, the microprocessor unit 80 performs a search mode operation. In this case, a directional antenna is used.

In this search mode, the rotation driver 82 automatically rotates the directional antenna of the antenna 74 by a predetermined time period under the control of the microprocessor unit 80. Thus, within each search zone that the directional antenna can receive (ie, automatic search to a farther distance than the preset safety zone, but sequentially moving through the fan-shaped search zones partitioned at equal intervals). Unique identification information and transmission power signals from the wireless wireless terminal (for example, 24 in the search area 1, 26 in the search area 2 and 28 in the search area 5) that have left the safety area are sequentially received.

That is, even if the infant has left the safe area and the search mode is not set, the unique identification information and the transmission power signal from the wireless terminal of the infant are not received by the antenna 74 of the guardian wireless terminal 100. When the search mode is set, since the directional antenna is used, the radio wave reception distance is farther, and thus, a unique identification information (ID) and a transmission power signal are received from the wireless terminal of the infant away from the safe area. Accordingly, when the transmission power signal received by the guardian's wireless terminal 100 is received and the corresponding distance information is read from the memory unit 72, it is determined how far away the infant is from the safe area. Able to know.

On the other hand, in the normal case where the mosquito (ie, the guardian's wireless terminal 100) to set the ID number where the infant or the object, and use the search function to determine the position of the child (infant) in advance It may be.

In addition, although the above-described guardian and infant radio terminals of the first and second embodiments do not have a built-in GPS module, the GPS module may be incorporated as necessary to accurately determine the current position of the infant. It's okay.

In addition, unlike the first and second embodiments described above, when the mosquitoes are configured to have only the receiver and only the transmitter, the mosquito adjusts the reception sensitivity of the mosquito to enable the departure and search, in which case If there is no reception signal corresponding to the magnetism, the deviation of the specific magnetism may be indicated.

As described in detail above, according to the present invention, when the guardian sets an arbitrary range of the safe zone that can be managed by the guardian, and the infant breaks out of the set safety zone, the guardian and the infant are alerted to prevent the occurrence of the missing child. In addition, since the location of the infant who has left the safety area can be searched, the infant can be found quickly.

On the other hand, the present invention is not limited only to the above-described embodiment, but can be modified and modified within the scope not departing from the gist of the present invention, the technical idea to which such modifications and variations are also applied to the claims Must see

1 is an overall configuration diagram illustrating the concept of the anti-lost wireless device according to the first embodiment of the present invention;

2 is a block diagram showing the configuration of a guardian wireless terminal shown in FIG. 1;

3 is a block diagram showing the configuration of the infant wireless terminal shown in FIG. 1;

4 is an overall configuration diagram illustrating a concept of a wireless device for preventing a lost child according to a second embodiment of the present invention;

FIG. 5 is a block diagram showing the configuration of a guardian wireless terminal shown in FIG.

※ Explanation of code for main part of drawing

10, 100: guardian wireless terminal 12 to 28: infant wireless terminal

30, 70: key input section 32, 72: memory section

34, 50, 74: antenna 36, 76: filter

38, 78: RF module 40, 58, 80: microprocessor

42, 66, 84: alarm part 44, 68, 86: display part

46, 88: warning message generator 52: RF amplifier

54 demodulation section 56 signal amplification section

60: transmission signal generator 62: modulator

64: output unit 82: rotation drive unit

Claims (9)

In the anti-lost wireless device, A plurality of infant wireless terminals wirelessly transmitting unique identification information and predetermined transmission power signals; And Receive unique identification information and transmit power signals from the plurality of infant wireless terminals, calculate a distance proportional to the received sensitivity of the infant wireless terminal using the transmit power signal as a receive sensitivity signal, and then set a preset safety zone. If there is a departure is provided with a single guardian wireless terminal for alerting, The one guardian wireless terminal includes: a key input unit for keying in a key input for designating a range of the safe area and a search mode; A memory unit storing unique identification information, names, and reference distance information proportional to each reception sensitivity of the plurality of infant wireless terminals; An antenna for receiving unique identification information and a predetermined transmission power signal transmitted wirelessly from the plurality of infant wireless terminals, and wirelessly transmitting a predetermined alarm signal to the infant wireless terminal that has left the safe area; A filter for filtering the unique identification information and the transmission power signal input through the antenna and amplifying the alarm signal to be wirelessly transmitted through the antenna; An RF module unit for shaping and encoding a signal from the filter, and converting a predetermined alarm signal to an RF signal to the filter; The distance from the infant wireless terminal is calculated based on the encoded data from the RF module unit to determine whether the set safety area is separated. A microprocessor unit for controlling signal transmission and controlling an operation of searching for a predetermined range of the safety zones to a far distance from the safety zone if the search mode is designated; An alarm unit outputting a predetermined alarm sound under control of the microprocessor unit; A display unit which displays the information on the wireless terminal for the child that has left the safe area under the control of the microprocessor unit; And a warning message generating unit for generating a predetermined warning message under the control of the microprocessor unit and transmitting the predetermined warning message to the RF module unit, adjusting the range of the safe area, and searching for a specific range of the safe area. You can search farther than the safe area. The plurality of infant wireless terminals, the wireless device for preventing the loss of child, characterized in that for receiving an alarm signal transmitted from the radio terminal for one guardian wirelessly. delete The apparatus of claim 1, wherein the antenna is a dual antenna comprising an isotropic antenna and a directional antenna. The apparatus of claim 1, wherein the RF module unit utilizes a plurality of channels using a frequency of 400 to 700 MHz. In the anti-lost wireless device, A plurality of infant wireless terminals wirelessly transmitting unique identification information and predetermined transmission power signals; And Receive unique identification information and transmit power signals from the plurality of infant wireless terminals, calculate a distance proportional to the received sensitivity of the infant wireless terminal using the transmit power signal as a receive sensitivity signal, and then set a preset safety zone. If there is a departure is provided with a single guardian wireless terminal for alerting, The one guardian wireless terminal includes: a key input unit for keying in a key input for designating a range of the safe area and a search mode; A memory unit storing unique identification information, names, and reference distance information proportional to each reception sensitivity of the plurality of infant wireless terminals; An antenna for receiving unique identification information and a predetermined transmission power signal transmitted wirelessly from the plurality of infant wireless terminals, and wirelessly transmitting a predetermined alarm signal to the infant wireless terminal that has left the safe area; A filter for filtering the unique identification information and the transmission power signal input through the antenna and amplifying the alarm signal to be wirelessly transmitted through the antenna; An RF module unit for shaping and encoding a signal from the filter, and converting a predetermined alarm signal to an RF signal to the filter; The distance from the infant wireless terminal is calculated based on the encoded data from the RF module unit to determine whether the set safety area is separated. Controls signal transmission, and if the search mode is specified, the safe zone is subdivided into a plurality of search zones, but the search for the existence of a wireless terminal for a child outside the safe zone is made automatically with the searchable distance farther than the safe zone. A microprocessor for controlling to be performed sequentially; A rotation driver which rotates the antenna by a predetermined time period by a control of the microprocessor unit; An alarm unit outputting a predetermined alarm sound under control of the microprocessor unit; A display unit which displays the information on the wireless terminal for the child that has left the safe area under the control of the microprocessor unit; And a warning message generating unit for generating a predetermined warning message under the control of the microprocessor unit and transmitting the predetermined warning message to the RF module unit, the range of the safe area can be adjusted, and the safe area is divided into a plurality of search areas. It is possible to automatically search sequentially for the existence of a wireless terminal for a child outside the safe area with the searchable distance farther than the safe area. The plurality of infant wireless terminals, the wireless device for preventing the loss of child, characterized in that for receiving an alarm signal transmitted from the radio terminal for one guardian wirelessly. delete The apparatus of claim 5, wherein the antenna is a dual antenna comprising an isotropic antenna and a directional antenna. The method of claim 5, And the rotation driving unit includes a step motor to rotate the directional antenna a predetermined angle by a predetermined time period under the control of the microprocessor unit. The apparatus of claim 5, wherein the RF module unit utilizes a plurality of channels using a frequency of 400 to 700 MHz.