JP2011066534A - Search system and search method - Google Patents

Abstract

An object of the present invention is to easily find a search target such as a lost child without the knowledge of a third party.
There are provided a parent terminal 10 capable of communication in ch1, a child terminal 20 capable of communication in ch1 and ch2, and a staff terminal 30 capable of communication in ch1 and ch2. Among these, the child terminal 20 transmits a lost child notification including its own terminal ID to the staff terminal 30 in ch2 when communication with the parent terminal 10 in ch1 is interrupted. In addition, the staff terminal 30 instructs the child terminal 20 that has transmitted the lost child notification to display a specific color by communication at ch1. As a result, the staff holding the staff terminal 30 can identify the lost child only by checking the specific color display displayed on the child terminal 20 without knowing information such as the appearance of the lost child or the clothes worn. can do.
[Selection] Figure 11

Description

  This case relates to a search system and a search method.

  Conventionally, in facilities such as shopping malls and amusement parks that are crowded with families, children can get lost from their parents (such as parents) and get lost. In that case, in order to search for the child, the guardian calls out the name of the child, searches the vicinity, consults with the lost child center in the facility, etc., and requests the staff on the facility side to search.

Of these, if you ask the staff to search, the staff will describe the characteristics of the lost child in the broadcast in the facility, and make sure that all the customers in the facility have no child suspected of being lost nearby. I often get it. However, in this method, since the information on the lost child is known to an unspecified number of people, there is a concern that a suspicious person may misuse the information and take away the lost child. For this reason, parents generally want to convey child information only to reliable facility staff, etc., but even in that case, there are the following problems.
(1) Since there are many children in the facility, the guardian who is the client explains in detail to the staff the characteristics of the lost child, that is, what kind of appearance and clothes the child has. There is a need.
(2) In addition, it is necessary to share the characteristics of the lost child among all staff members who conduct searches. For this purpose, it is necessary to gather staff in one place to convey the characteristics of the lost child or to convey it to each person by telephone or wireless communication terminal, which takes time and effort.
(3) In addition, there may be children in the facility whose characteristics are similar to those of a lost child. In this case, the staff cannot be sure that the child is lost, and cannot protect the lost child without confirmation from the guardian. For this reason, it may take time and effort to protect the lost child.

  On the other hand, recently, techniques such as Patent Documents 1 to 3 have also appeared.

JP 2000-4237 A JP 2007-241529 A JP-A-8-307339

  The technique described in Patent Document 1 displays information directed to a child at an information transmission terminal in the vicinity when the distance between the guardian and the child is increased in an amusement park or the like. This technique presents information to a lost child and is not intended for a third party to identify the lost child.

  The technique described in Patent Document 2 specifies the identification information of a child device held by the lost child from the identification information of the parent device, and causes the light emitting device of the access point located in the vicinity of the child device to emit light. The person who gets lost is identified. Although it is understood that a lost child is present near the access point in the present technology, there is a possibility that the lost child cannot be specified when there are a plurality of children. In addition, it is necessary to install an access point and a light emitting device in the facility, which may be troublesome and expensive.

  The technique described in Patent Document 3 is to send audio from a portable transmitter / receiver of a lost person. However, in this technique, not only the staff searching for the lost child but also other third parties. Since the person can also identify the lost child, countermeasures against suspicious persons are not sufficient.

  Therefore, the present invention has been made in view of the above-described problems, and an object thereof is to provide a search system and a search method that can easily find a search target such as a lost child without being known to a third party.

  The search system described in this specification is capable of communication on a first terminal capable of communication on a first channel, and on the first channel and a second channel different from the first channel. A second terminal, and a third terminal capable of communicating on the first channel and the second channel, wherein the second terminal is configured to transmit the first terminal on the first channel. When communication with the terminal is interrupted, the communication terminal includes transmission means for transmitting communication disconnection information including its own terminal information to the third terminal using the second channel. The search system includes an instruction unit that instructs execution of a specific operation to the second terminal that has transmitted the communication disconnection information through communication on the first channel.

  The search method described in the present specification includes a step in which the second terminal determines that communication between the first terminal and the second terminal has been interrupted, and a determination that the communication has been interrupted. The second terminal broadcasts communication disconnection information including its own terminal information to at least one third terminal, and the third terminal receiving the communication disconnection information transmits the communication disconnection information. And a step of instructing the second terminal, which is a transmission source of the disconnection information, to execute a specific operation.

  The search system and the search method described in this specification have an effect that a search target such as a lost child can be easily found without being known to a third party.

It is a figure which shows the example of distribution of the terminal which comprises the search system which concerns on one Embodiment. 2A is a block diagram showing a control system of a parent terminal, FIG. 2B is a block diagram showing a control system of a child terminal, and FIG. 2C is a control system of a staff terminal. FIG. It is a figure which shows the communication state between a parent terminal, a child terminal, and a staff terminal. FIG. 4A is a perspective view showing the child terminal at the normal time, and FIG. 4B is a perspective view showing the child terminal at the time of the lost child. It is a flowchart which shows the process of a parent terminal. It is a flowchart which shows the process of a child terminal. It is a flowchart which shows the process of a staff terminal. It is a figure (the 1) which shows the state in a facility for demonstrating the process by a search system. It is a figure (the 2) which shows the state in a facility for demonstrating the process by a search system. It is FIG. (The 3) which shows the state in a facility for demonstrating the process by a search system. It is FIG. (The 4) which shows the state in a facility for demonstrating the process by a search system. It is a perspective view which shows the modification of a child terminal.

  Hereinafter, an embodiment of a search system and a search method will be described in detail with reference to FIGS.

  The search system of the present embodiment includes a plurality of terminals, and each terminal, as shown in FIG. 1, is a parent or child who has visited a facility such as a shopping center, or a staff of a facility (such as a store clerk, a cleaning staff, or an information desk). ) To be lent and distributed. Specifically, among each parent and child, the parent terminal 10 as the first terminal is distributed to the parent, the child terminal 20 as the second terminal is distributed to the child, and the staff as the third terminal is distributed. The staff terminal 30 is distributed.

  The parent terminal 10 is assumed to have a shape such as a mobile phone or a transceiver, for example. FIG. 2A shows a block diagram of the parent terminal 10. As shown in FIG. 2A, the parent terminal 10 includes a communication unit 11, a display unit 12 and a speaker 13 as a reporting unit, a communication control unit 14, a display control unit 15, and a sound output control unit 16. And memories 17 and 18.

  The communication unit 11 communicates with the child terminal 20. Specifically, as shown in FIG. 3, the communication unit 11 can transmit and receive with the child terminal 20 (communication unit 21) through one channel (ch1).

  Returning to FIG. 2A, the display unit 12 is a display such as a liquid crystal display or an organic EL display. Under the instruction of the display control unit 15, the external (parent terminal 10) indicates that communication with the child terminal 20 has been interrupted. A specific sentence etc. for reporting to the parent who holds the message is displayed. The display control unit 15 refers to a table stored in the memory 17 and stores a correspondence relationship between the state of the parent terminal 10 and the sentence to be displayed when the parent terminal 10 is in a certain state, and sets the current state. The corresponding sentence is displayed on the display unit 12. For example, in a state where communication between the parent terminal 10 and the child terminal 20 is interrupted, a text such as “Child has been lost” is displayed on the display unit 12. The display unit 12 is not limited to a display, and a pilot lamp that displays necessary items by color change may be used. In this case, for example, a rule such that red lighting means “a child has been lost” may be made known to the parent who owns the parent terminal 10.

  The speaker 13 outputs a necessary sound (warning sound) under the instruction of the sound output control unit 16. The sound output control unit 16 refers to a table stored in the memory 18 that stores a correspondence relationship between the state of the parent terminal 10 and the sound to be output when the parent terminal 10 is in a certain state. To control. Since the sound output control unit 16 basically performs sound output control in conjunction with the display control of the display control unit 15, the display of the sentence and the output of the sound (warning sound) are performed simultaneously. It has become. Instead of the speaker 13, a mechanism (sound generation source such as a bell) capable of outputting sound may be used.

  The child terminal 20 has a shape as shown in FIG. As shown in FIG. 4A, the child terminal 20 includes a main body 29 and a display unit 22 as a display unit. The main body portion 29 is provided with an attachment portion 29a for attaching a strap 41 for allowing a person (child) to hang the child terminal 20 from the neck. FIG. 2B shows a block diagram of the child terminal 20. As shown in FIG. 2B, the main body 29 includes a communication unit 21 as a transmission unit, a speaker 23, a communication control unit 24, a display control unit 25, a sound output control unit 26, and a memory 27. , 28. That is, the child terminal 20 basically has the same configuration as the parent terminal 10 in FIG. As shown in FIG. 3, the communication unit 21 can communicate on two channels (ch1, ch2). Specifically, the communication unit 21 transmits / receives (ch1) to / from the parent terminal 10 (communication unit 11), transmits / receives to / from the staff terminal 30 (communication unit 31), and from the staff terminal 30. Reception (ch1) is possible.

  Here, transmission using ch2 from the child terminal 20 is broadcast transmission. That is, when, for example, a lost child notification (notification issued when communication with the parent terminal 10 is not possible) is transmitted from the child terminal 20, all the staff existing within a range where communication with the child terminal 20 is possible. The terminal 30 receives the lost child notification.

  As the display unit 22, for example, a light and thin display such as electronic paper is used. The display unit 22 normally continues to display a picture as shown in FIG. 4A under the instruction of the display control unit 25. Note that when electronic paper is used as the display unit 22, there is an advantage that power is not consumed even if pictures and the like are continuously displayed. Further, the display unit 22 performs a warning display (for example, lighting of a specific color) as shown in FIG. 4B according to the command received from the staff terminal 30 under the control of the display control unit 25. The display control unit 25 displays a sentence corresponding to the received command on the display unit 22 by referring to a table stored in the memory 27 and storing a correspondence relationship between the received command and a warning display to be displayed. Let In the above description, the case where a picture or the like is continuously displayed on the display unit 22 has been described. However, the present invention is not limited to this, and the display unit 22 may be hidden during normal operation. Moreover, it is good also as using other displays, such as not only electronic paper but organic EL.

  Returning to FIG. 1, the staff terminal 30 is assumed to have a shape such as a mobile phone or a transceiver, for example, like the parent terminal 10. FIG. 2C shows a block diagram of the staff terminal 30. As shown in FIG. 2C, the staff terminal 30 is similar to the parent terminal 10 in that the communication unit 31, the display unit 32, the speaker 33, the communication control unit 34, the display control unit 35, and the sound output A control unit 36 and memories 37 and 38 are provided. The staff terminal 30 has an input interface 39. The input interface 39 includes a numeric keypad, a command determination button, a transmission button, and the like. As shown in FIG. 3, the communication unit 31 can communicate on two channels (ch1, ch2). Specifically, the communication unit 31 can perform transmission / reception (ch2) with the child terminal 20 (communication unit 21) and transmission (ch1) to the child terminal 20 (communication unit 21). Note that transmission (ch1) from the staff terminal 30 to the child terminal 20 is performed only to the terminal having the terminal ID designated by the user (staff) on the staff terminal 30.

  When the display unit 32 receives a lost child notification from the child terminal 20 under the instruction of the display control unit 35, the display unit 32 displays warning information such as “the child with the terminal ID: XXX has been lost”.

  Returning to FIG. 1, it is assumed that the parent terminal 10 and the child terminal 20 distributed to each parent and child have the same PAN_ID. This PAN_ID means a group ID of each parent and child, and communication (ch1) is possible only between terminals having the same PAN_ID. In FIG. 1, “011” is assigned as the PAN_ID to the parent and child 1, “021” is assigned as the PAN_ID to the parent and child 2, and “031” is assigned to the parent and child 3 as the PAN_ID. Communication between the parent terminal 10 and the child terminal 20 is possible only when the distance between the terminals is within a predetermined range. Conversely, the parent terminal 10 and the child terminal are more than the predetermined range. If the distance of 20 is away, a communication error occurs. When this communication error occurs, the parent terminal 10 displays a message such as “Your child is lost” on the display unit 12 and a warning sound from the speaker 13 as described above. Further, the child terminal 20 broadcasts a lost child notification to surrounding staff terminals 30. As shown in FIG. 1, the terminal ID unique to the terminal is given to the parent terminal 10 and the child terminal 20 in addition to the PAN_ID.

  On the other hand, the staff terminal 30 is assigned a different PAN_ID and a terminal ID. Note that a common ID may be set as the PAN_ID of the staff terminal 30. In addition, different PAN_IDs may be set for each group such as each staff department or group.

  Note that various methods can be used as a wireless communication method between the terminals. For example, a communication method defined in IEEE 802.15.4, a method described in Japanese Patent Application Laid-Open No. 2008-330196, a method described in Japanese Patent Application Laid-Open No. 2009-49924, or the like can be used.

  Next, search processing using the search system described above will be described. First, the search process by the search system will be briefly described. When the parent terminal 10 and the child terminal 20 can communicate with each other (see FIG. 8), it is considered that the distance between the parent terminal 10 and the child terminal 20 has increased. "Occurrence" (see terminal ID: 011 in FIG. 9). In this case, the parent terminal 10 displays on the display unit 12 that a lost child has occurred. Further, the child terminal 20 broadcasts a lost child notification to the staff terminal 30 (see FIG. 10). Then, in the staff terminal 30 that has received the lost child notification, the lost child notification is displayed on the display unit 32, and the staff member who has seen the lost child notification identifies the child terminal 20 that has transmitted the lost child notification from the staff terminal 30. Is instructed to perform the operation (color display) (see FIG. 11). Thus, the staff can identify and protect the lost child based on the color display or the like.

  Next, specific processing of each terminal for realizing the above processing will be described in detail with reference to the flowcharts of FIGS. First, processing of the parent terminal 10 will be described based on FIG.

  In the parent terminal 10, in step S <b> 10 of FIG. 5, the communication control unit 14 sets n as a variable that takes a value from 1 to N caused by the number of slave units (N), and sets the initial value of the variable n to 1. At the same time, the initial value of the variable k indicating the number of searches is set to zero. Next, in step S12, the communication control unit 14 starts a timer. Next, in step S14, the communication control unit 14 determines whether or not the timer exceeds a predetermined threshold value. Here, for example, when communication with the child terminal 20 is performed at 1-minute intervals, 1 minute is set as the threshold value.

  The communication control unit 14 waits until the determination in step S14 is affirmed, and then clears the timer in step S16 when the determination in step S14 is affirmed. Next, in step S18, an Ack transmission command is transmitted to the nth (here, the first) child terminal 20. For example, as shown in FIG. 8, from the parent terminal 10 with the terminal ID “101”, the child terminal 20 with the smallest terminal ID among the child terminals 20 with the same PAN_ID (here, the child terminal with the terminal ID “001”). Ack transmission command is transmitted to the terminal. Here, the Ack transmission command is a command for causing the parent terminal 10 to reply that the child terminal 20 has received the command. That is, if the Ack is returned from the child terminal 20 after the parent terminal 10 transmits the Ack transmission command, it means that communication between the parent terminal 10 and the nth child terminal 20 is established. To do. In this case, the child terminal 20 exists in the vicinity of the parent terminal 10, which means that there is a high probability that the child terminal 20 is not lost.

  Next, in step S20, the communication control unit 14 determines whether or not an Ack has been received from the child terminal 20. If the determination here is affirmative (that is, if there is a high probability of not being lost), the process proceeds to step S22. In this case, the communication control unit 14 sets k to 0 in step S22, increments n by 1 (n ← n + 1, here n = 2) in step S24, and then proceeds to step S26. In step S26, the communication control unit 14 determines whether n is larger than the number of slave units (N). Here, the number of slave units (N) is 2 if the PAN_ID shown in FIG. 1 is a parent and child of “011”, 1 if it is a parent and child of “021”, and 3 if it is a parent and child of “031”. If the determination is negative, the process returns to step S18. If the determination is positive, the process returns to step S10.

  If the determination in step S26 is negative, the processing subsequent to step S18 is executed in the same manner for the second child terminal 20 (terminal having the second smallest terminal ID).

  Here, processing when the determination in step S20 is negative will be described. The case where the determination in step S20 is negative is a case where the child terminal 20 is separated from the parent terminal 10 as shown in the terminal IDs “111” and “011” in FIG. Means. In this case, the process proceeds to step S28, and the communication control unit 14 increments k by 1 (k ← k + 1, here k = 1). Next, in step S30, the communication control unit 14 determines whether k is greater than or equal to a threshold value K (K is 3 for example). If the determination is negative, the process returns to step S18, and an Ack transmission command is transmitted again to the same child terminal 20. Thereafter, if the Ack cannot be received even after repeating the transmission of the Ack transmission command K times, the determination in step S30 is affirmed. In this case, the process proceeds to step S32, the communication control unit 14 notifies the display control unit 15 of the fact, and the display control unit 15 notifies the display unit 12 that the child has been lost. Is displayed. At the same time, the communication control unit 14 notifies the sound output control unit 16 to that effect, and the sound output control unit 16 outputs a warning sound from the speaker 13. As a result of sending the command K times as described above, the message of the lost child is displayed for the first time due to the presence of obstacles such as buildings and people. It is because it is too early to determine that you are lost.

  As described above, the parent terminal 10 sequentially transmits an AcK transmission command to the child terminals 20 having the same PAN_ID at predetermined time intervals (steps S12 to S16) (step S18). Then, even if the command is transmitted K times, if Ack is not transmitted from the child terminal 20, it is determined that a lost child has occurred, and the fact is displayed on the display unit 12 (step S32). Accordingly, the parent terminal 10 can appropriately determine whether or not a lost child has occurred based on the communication state with the child terminal 20, and can notify the parent of the determination result.

  Next, the process of the child terminal 20 will be described based on FIG. Here, first, processing of the child terminal 20 in a state where the child holding the child terminal 20 is not lost will be described. As a premise, the lost child flag set in the communication control unit 24 can be either “lost child” or “normal”, but here it is assumed to be set to “normal”.

  First, in step S40 of FIG. 6, the communication control unit 24 sets a variable s indicating the continuous timeout number to 0. Here, the “number of continuous timeouts” is a numerical value indicating how many times the number of times that the Ack transmission command transmitted from the parent terminal 10 could not be received during a predetermined time has continued. Next, in step S42, the communication control unit 24 starts a timer. Next, in step S44, the communication control unit 24 determines whether a command has been received. If the determination here is affirmed, the process proceeds to step S46, and the communication control unit 24 determines whether or not the received command is a command received from the staff terminal 30. If the command here is a command from the parent terminal 10, the determination is denied, and Ack is transmitted to the parent terminal 10 in step S50. Thereafter, the communication control unit 46 sets s to 0 in step S52, sets (maintains) the lost child flag to “normal” in step S54, clears the timer in step S68, and returns to step S42.

  Next, a process when the child (terminal ID: 011) is away from the parent (terminal ID: 111) and lost as shown in FIG. 9 will be described.

  If the child is lost, the determination in step S44 (determination as to whether a command has been received) is denied, and the process proceeds to step S56. In the next step S56, the communication control unit 24 refers to the timer value and determines whether or not a predetermined time has elapsed. If the determination is negative, the process returns to step S44. If the determination is positive, the process proceeds to step S58.

  In the next step S58, the communication control unit 24 determines whether or not the lost child flag is “lost child”. For example, as described above, when the lost child flag is “normal” (see step S54), the determination here is denied and the process proceeds to step S60. In step S60, the communication control unit 24 increments s by 1 (s ← s + 1), and in the next step S62, determines whether s is equal to or greater than a predetermined threshold (S). If the determination here is negative, the number of times that the command could not be received is still small, and it is too early to determine that the command is lost, so the timer returns to step S42 after the timer is cleared in step S68. . On the other hand, if the determination in step S62 is affirmed by repeating steps S42, S44, S56, S58, and S60, the communication control unit 24 sets the lost child flag to “lost” in step S64. That is, in this embodiment, the lost child flag is set to “lost” for the first time when the consecutive timeout occurs S times, and the lost child flag is maintained as “normal” when the number of consecutive timeouts is less than S times. Will be.

  After that, in step S66, the communication control unit 24 broadcasts a lost child notification (also communication disconnection information indicating that communication with the parent terminal is disconnected) via ch2 via the communication unit 21. FIG. 10 shows a state in which a child who has the child terminal 20 (terminal ID: 011) is lost, and a lost child notification is broadcast from the terminal. A circular range indicated by a broken line in FIG. 10 means a communication range at ch2. Therefore, in FIG. 10, only the staff terminal 30 (terminal ID: 931) can receive the lost child notification. The lost child notification includes a terminal ID that identifies the terminal, such as “a child with a terminal ID of 011 has been lost”. Thereafter, in step S68, after the communication control unit 24 clears the timer, the process returns to step S42.

  In the present embodiment, even after the child is lost, when the command is received again from the parent terminal 10, the lost child flag returns to “normal” in step S54. Accordingly, the lost child notification broadcast transmission (step S66) is not performed thereafter. The process of step S48 in FIG. 6 will be described later.

  As described above, the child terminal 20 continues to transmit Ack while receiving the Ack transmission command from the parent terminal 10 (step S50) and also maintains the lost child flag at “normal” (step S54). ). On the other hand, when the number of times that the command cannot be received from the parent terminal 10 has passed the predetermined time (timeout) exceeds the threshold S (step S62), the lost child flag is set to “lost child” (step S64), The lost child notification is broadcast by ch2 (step S66). As a result, the child terminal 20 can determine that the child terminal 20 is lost from the parent terminal 10 based on whether or not the command transmitted from the parent terminal 10 can be received. Further, the lost child notification can be directly transmitted only from the child terminal 20 owned by the lost child to the staff terminal 30 existing in the vicinity.

  Next, the process of the staff terminal 30 is demonstrated along the flowchart of FIG. First, in step S70, the communication control unit 34 stands by until data (command or notification) is received. If the determination in step S30 is affirmed, the communication control unit 34 analyzes the data in step S72. Here, as the data analysis, it is analyzed whether the data is a command or a notification.

  Next, in step S74, the communication control unit 34 determines whether or not the data is “lost child notification” as a result of the data analysis in step S72. If the determination here is affirmed, the communication control unit 34 notifies the display control unit 35 of the fact in step S76, and the display control unit 35 notifies the display unit 32 of “terminal ID: XXX”. Is lost. "Is displayed. At the same time, the communication control unit 34 notifies the sound output control unit 36 to that effect, and the sound output control unit 36 outputs a warning sound from the speaker 33.

  Next, in step S78, the communication control unit 34 stands by until the staff presses the command transmission button of the input interface 39. Specifically, the staff inputs a terminal ID (here, terminal ID: 011) described in the lost child notification and displays a specific color on the display unit 22 (hereinafter referred to as a display command). And wait until the command send button is pressed. When the command transmission button is pressed, the process proceeds to step S80, and the communication control unit 34 displays the display command at ch1 to the child terminal 20 of the input terminal ID (here, 011) via the communication unit 31. Send. As can be seen from the processing in step S80, the communication control unit 34 and the communication unit 31 serve as instruction means for instructing the child terminal 20 that has transmitted the lost child notification to execute a specific operation (display of a specific color). It has the function of

  When a display command is transmitted to the child terminal 20 through step S80, the child terminal 20 affirms the determination in step S46 shown in FIG. In the child terminal 20, in step S48, the display control unit 25 turns on a specific color (a conspicuous color, such as red) on the display unit 22 (see FIG. 11). Thereafter, the process returns to step S42.

  If the determination in step S74 in FIG. 7 is negative, the process proceeds to step S82 to execute a process for executing some received command.

  As described above, when the data received from the outside is the “lost child notification”, the staff terminal 30 displays the fact on the display unit 32, and the staff who has seen this specifies the terminal ID. Thus, a display command can be sent to a lost child terminal. Therefore, for example, as shown in FIG. 11, there are two or more children (terminal IDs: 023, 011) having a possibility of getting lost in the vicinity of the staff (terminal ID: 931) that has received the lost child notification. However, by displaying a specific color only on the lost child terminal 20 (terminal ID: 011), the lost child can be easily specified.

  As described above, in this embodiment, the lost child can be easily identified and protected without notifying the searching staff of the characteristics of the lost child. In addition, since broadcasting is not used, the characteristics of the lost child are not known to third parties, and the lost child can be identified and protected without inducing a crime.

  Note that the contact with the parent after protecting the lost child may be made by contacting a contact (for example, a mobile phone) previously reserved when lending the terminal. Moreover, it is good also as calling a parent by the broadcast in a facility. In this case, the identity verification of the parent may be performed by authenticating the terminal ID of the parent terminal.

  As described above in detail, according to the present embodiment, communication is possible in the ch1 and ch2, and the parent terminal 10 capable of communication in ch1 and the child terminal 20 capable of communication in ch1 and ch2. Of these, the child terminal 20 sends a lost child notification including its own terminal ID to the staff terminal 30 when the communication with the parent terminal 10 at ch1 is interrupted. It has the communication part 21 which transmits by. The staff terminal 30 includes a communication control unit 34 that instructs the child terminal 20 that has transmitted the lost child notification to display a specific color by communication at ch1. Thereby, in this embodiment, the staff holding the staff terminal 30 can display the specific color displayed on the child terminal 20 without knowing information such as the appearance of the lost child and the clothes worn. It is possible to identify a lost child simply by confirming. This makes it possible to search for lost children before they are contacted by their parents, and to search for lost children without requesting all staff to search for lost children from the Lost Child Center etc. . In addition, even after finding a child suspected of being lost, it is possible to protect the lost child without requiring parental confirmation, and it is possible to protect the lost child without the information of the lost child being known to a third party. Thus, in this embodiment, since only the minimum necessary staff can know the fact that a lost child has occurred, crimes such as the removal of a lost child can be suppressed. In addition, since the search system can be realized without performing any installation work such as an access point in the facility, it is possible to reduce labor and cost required for the introduction of the system. In addition, since it is not necessary to use an effective device such as GPS, the cost can be reduced also in this respect.

  Moreover, in this embodiment, since the communication part 21 of the child terminal 20 broadcasts a lost child notification to the plurality of staff terminals 30, it transmits to all the staff terminals 30 existing in the communicable range of the child terminal 20. Can send lost child notifications. In this case, the staff can easily narrow down lost child candidates by setting the communicable range of the child terminal 20 to a range within which the staff can reach. In addition, the staff can easily identify a lost child by finding a specific color display terminal from the narrowed lost child candidates.

  Further, in the present embodiment, the parent terminal 10 includes a display unit 12 that displays that the communication with the child terminal 20 has been interrupted and notifies the outside. Therefore, the parent who owns the parent terminal 10 can know that his / her child has been lost at an early stage, and can search for the child before the child has traveled so far.

  In the present embodiment, since the staff terminal 30 displays a specific image (specific color display or the like) on the display unit 22 of the child terminal 20, it is possible to determine whether the child is lost or not even from a relatively long distance. Can do.

  In the present embodiment, the staff terminal 30 displays a specific color on the display unit 22 of the child terminal 20 owned by the lost child and outputs a sound from the speaker. Therefore, even when there are many people in the facility and the lost child cannot be visually recognized, it is possible to easily search for the lost child.

  In addition, although the said embodiment demonstrated the case where communication between one parent and another child was restrict | limited by PAN_ID allocated to the terminal which each parent and child possessed, it is not restricted to this. For example, the communication between the parent and child may be limited by changing the channel used for communication by the terminal owned by each parent and child.

  In the embodiment described above, the lost child notification from the child terminal 20 to the staff terminal is broadcasted, but the present invention is not limited to this. For example, the child terminal 20 may sequentially specify the PAN_IDs of all staff terminals 30 existing in the facility and sequentially transmit lost child notifications.

  In the above embodiment, the child terminal 20 is caused to output a specific display and a specific sound to specify the lost child. However, the present invention is not limited to this, and the child terminal 20 has only one of the display and the sound. It may be output.

  In addition, although the said embodiment demonstrated the case where a parent terminal and a child terminal were made into a different shape, it is good also as not only this but the same shape. That is, a terminal using electronic paper may be adopted as the parent terminal, and a terminal shaped like a mobile phone may be adopted as the child terminal.

  In addition, although the said embodiment demonstrated the case where a terminal was distributed to a parent and child, not only this but a parent terminal and a child terminal can distribute regardless of age. For example, the parent terminal and the child terminal may be distributed to friends, or the child terminal may be distributed to the elderly and pets.

  In the above embodiment, the case where the child terminal 20 is hung on the neck using the strap 41 has been described. However, the present invention is not limited to this, and as shown in FIG. 12, the child terminal 20 is attached to clothes or the like with a fastener 42 such as a safety pin. May be. Moreover, it is good also as attaching not only to these but to a body (arm etc.) or clothes by other methods.

  In the above embodiment, in order to display the fact that the child is lost on the display unit 12 of the parent terminal 10, the parent terminal 10 also makes a lost child determination using the variable k. However, the present invention is not limited to this, and as long as display on the parent terminal 10 is not performed, it is possible to continue to send some data (data replacing the Ack transmission command) from the parent terminal 10. Even in this case, the child terminal 20 can perform the lost child search similar to that in the above-described embodiment by executing processes other than step S50.

  In addition, the process (step S44, S56, S58, S60, the process in which the child terminal 20 determines that communication between the parent terminal 10 and the child terminal 20 is interrupted by using the search system described in the above embodiment. When it is determined that the communication has been interrupted (S62), the child terminal 20 broadcasts a lost child notification (communication disconnection information) including its own terminal ID to at least one staff terminal 30 (step S66). And the staff terminal 30 that has received the lost child notification instructs the child terminal 20 that is the transmission source of the lost child instruction to execute a specific operation (step S80). I can say that.

  The above-described embodiment is an example of a preferred embodiment of the present invention. However, the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention.

10 Parent terminal (first terminal)
12 Display section (reporting means)
13 Speaker (reporting means)
20 Child terminal (second terminal)
21 Communication unit (transmission means)
22 Display means (display unit)
23 Speaker (Sound output means)
30 Staff terminal (third terminal)
31 Communication part (part of instruction means)
34 Communication control unit (part of instruction means)

Claims (6)

A first terminal capable of communication on the first channel;
A second terminal capable of communicating on the first channel and a second channel different from the first channel;
A third terminal capable of communication on the first channel and the second channel,
When the second terminal stops communication with the first terminal on the first channel, the second terminal sends communication interruption information including its own terminal information to the third terminal. Transmission means for transmitting on the channel of
The search system characterized in that the third terminal has an instruction means for instructing the second terminal that has transmitted the communication disconnection information to execute a specific operation through communication on the first channel. . A plurality of the third terminals;
2. The search system according to claim 1, wherein the transmission unit of the second terminal broadcasts the communication disconnection information to the plurality of third terminals.   3. The search system according to claim 1, wherein the first terminal has reporting means for reporting to the outside that communication with the second terminal has been interrupted. The second terminal has display means for displaying an image,
The search system according to claim 1, wherein the specific operation includes an operation of displaying a specific image on the display unit. The second terminal has sound output means for outputting sound,
The search system according to claim 1, wherein the specific operation includes an operation of outputting a specific sound from the sound output unit. The second terminal determining that communication between the first terminal and the second terminal has been interrupted;
When it is determined that the communication has been interrupted, the second terminal broadcasts communication disconnection information including its own terminal information to at least one third terminal; and
And a third terminal receiving the communication disconnection information, instructing the second terminal that is a transmission source of the communication disconnection information to execute a specific operation.

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