JP2007272634A - Loss/theft prevention system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a baggage from being lost or stolen while suppressing scaling up of a system configuration. <P>SOLUTION: A master unit 11 is attached to one's own body, and slave units 22a to 22d are attached to portable objects. When communication is respectively established between the master unit 11 and the slave units 22a to 22d, a distance determining part 114 discriminates whether the master unit 11 is separated from the slave units 22a to 22d at a fixed distance or more, and a control part 113 operates an alarm part 116 to ring an alarm for only a period determined by a timer 115 when the master unit 11 is separated from the slave units 22a to 22d at the fixed distance or more. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a loss / theft prevention device, and is particularly suitable for application to a method for warning the loss or theft of an article by performing direct communication between a parent device and a child device.

  With the recent spread of mobile phones, higher performance of personal computers, and increased capacity of USB memories, there are increasing opportunities to carry these portable information terminals to the outside. On the other hand, as the number of opportunities to carry these portable information terminals increases, the chances of losing these portable information terminals and theft of portable information terminals also increase, and leakage of personal and confidential information Has become a serious problem.

On the other hand, there is a snatching prevention buzzer configured such that a loud buzzer sounds when a pin is pulled out in order to prevent snatching of a wallet or a bag.
In addition, for example, in Patent Document 1, an existing mobile communication network and a portable communication device can be used to construct a simple and low-cost, and the abnormal state of a carried item such as theft or loss. An anti-theft system is disclosed that can notify the occurrence at an early stage, quickly recognize the location of a carry-on item, and retrieve it at hand.
JP 2000-215374 A

However, in the method disclosed in Patent Document 1, it is necessary to use an existing mobile communication network and portable communication device in order to notify early of the occurrence of an abnormal state of a carried item such as theft or loss. For this reason, there has been a problem that the structure of the anti-theft system becomes large-scale and obstructs the spread of the anti-theft system.
SUMMARY OF THE INVENTION An object of the present invention is to provide a loss / theft prevention device capable of preventing loss or theft of carried items while suppressing an increase in scale of the system configuration.

In order to solve the above-described problem, according to the loss / theft prevention device according to claim 1, the distance between the parent device and the child device is constant based on the communication state between the parent device and the child device. A distance determination means for determining whether or not the distance is greater than a distance; and an alarm generation means for generating an alarm on the parent device side when the distance between the parent device and the child device is greater than a certain distance. Features.
Thereby, by performing direct communication between the parent device and the child device, it can be determined whether or not the parent device and the child device are separated by a certain distance or more. For this reason, by attaching a handset to the carry-on item and keeping the parent unit at hand, an alarm can be given immediately if the carry-on item is lost, and the loss of the carry-on item is suppressed while preventing the system configuration from becoming large-scale. Can be prevented. In addition, since a plurality of slave units can be registered in one master unit, a rational system configuration can be achieved.

  According to the loss / theft prevention device according to claim 2, distance setting means for individually setting a distance between the parent device and the child device for each child device, and the parent device and the child device, Distance determining means for individually determining whether or not the distance between the master unit and the slave unit is greater than a set distance based on a communication state between the master unit and the master unit and the slave unit And an alarm generating means for generating an alarm on the parent device side and the child device side when the distance between the two is greater than a set distance.

  As a result, by performing direct communication between the parent device and the child device, it is possible to determine whether the parent device and the child device are separated by a certain distance or more, and for each type of article. The detection distance for sounding the alarm can be varied. For this reason, by attaching a handset to the carry-on item and keeping the master unit at hand, it is possible to receive an alarm immediately if the carry-on item is lost, and the scale of the system configuration is suppressed, while suppressing the increase in the size of the carry-on item. It becomes possible to prevent loss.

  According to the loss / theft prevention device according to claim 3, whether or not the master unit and the slave unit are separated by a certain distance or more is determined based on a communication state between the master unit and the slave unit. Based on a distance determination means for determining and a change state of a communication state between the parent device and the child device, it is determined whether a speed difference between the parent device and the child device is a certain value or more. Speed difference determining means, and when the speed difference between the master unit and the slave unit is a predetermined distance or more and a speed difference between the master unit and the slave unit is a predetermined value or more, the master unit side and the An alarm generating means for generating an alarm on the slave unit side is provided.

As a result, by performing direct communication between the master unit and the slave unit, it becomes possible to determine whether or not the master unit and the slave unit are separated by a certain distance or more, and the master unit and the slave unit Whether the speed difference between the remote and the slave is greater than a certain value, whether the slave is stationary when the slave is lost or whether the slave is moving in the opposite direction of the master Can be identified. For this reason, it is possible to distinguish whether the carry-on item has been lost or stolen by attaching the slave unit to the carry-on item and keeping the master unit at hand. Can be prevented from being lost or stolen.
According to a fourth aspect of the present invention, in the loss / theft prevention device, the parent device is a chip component incorporated in a carried item.
As a result, the master unit can be incorporated into a mobile communication terminal such as a mobile phone, and the range of articles to which the loss / theft prevention device can be applied can be expanded.

  As described above, according to the present invention, it is possible to determine whether or not the distance between the parent device and the child device is more than a certain distance by performing direct communication between the parent device and the child device. This makes it possible to prevent the loss of carry-on items while suppressing an increase in the scale of the system configuration.

Hereinafter, a loss / theft prevention device according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is an external view showing a schematic configuration of a loss / theft prevention device according to a first embodiment of the present invention.
In FIG. 1, the loss / theft prevention device is provided with a parent device 11 and child devices 22a to 22d, and the parent device 11 can directly communicate with the child devices 22a to 22d. Examples of a method in which the parent device 11 directly communicates with each of the child devices 22a to 22d include, for example, Bluetooth and IrDA. Here, the parent device 11 can be used by attaching it to itself, and the child devices 22a to 22d can be used by being attached to the carry items. For example, the slave units 22a to 22d can be used by being attached to the mobile phone 21a, the personal computer 21b, the USB memory 21c, and the bag 21d, respectively. In addition, when attaching the subunit | mobile_units 22a-22d to the mobile telephone 21a, the personal computer 21b, the USB memory 21c, and the bag 21d, a strap etc. can be used, for example. Moreover, you may make it use an RFID tag as the subunit | mobile_unit 22a-22d.

  The base unit 11 includes a power switch 17 for turning on / off the power, an alarm on / off switch 12 for setting on / off of the alarm, and an alarm switching unit 13 for switching alarm means (sound, vibration, etc.). , An alarm sound setting unit 14 for setting an alarm sound (melody, buzzer, etc.), a volume setting unit 15 for setting an alarm volume, and a distance between the parent device 11 and the child devices 22a to 22d when an alarm is generated. An operating distance setting unit 16 for setting is provided.

FIG. 2 is a block diagram showing a schematic configuration of the loss / theft prevention device according to the first embodiment of the present invention.
2, the base unit 11 in FIG. 1 includes an antenna 111, a communication unit 112 that performs communication with the handset units 22a to 22d, and a communication state between the base unit 11 and the handset units 22a to 22d. , A distance determination unit 114 for determining whether or not the distance between the parent device 11 and the child devices 22a to 22d is more than a certain distance, a timer 115 for measuring time, an alarm unit 116 for generating an alarm, and a vibration for generating a vibration A generation unit 117 and a control unit 113 that performs overall control of these blocks are provided.

On the other hand, the slave unit 22a of FIG. 1 is provided with a communication unit 24 that performs communication between the antenna 23 and the master unit 11. In addition, the subunit | mobile_unit 22b-22d can also take the structure similar to the subunit | mobile_unit 22a.
When the base unit 11 is attached to the mobile phone 21a, the personal computer 21b, the USB memory 21c, and the bag 21d with the base unit 11 attached thereto, and the power switch 17 is turned on, Communication is established with each of the slave units 22a to 22d. When communication is established between the parent device 11 and the child devices 22a to 22d, the distance determination unit 114 is connected to the parent device 11 based on the communication state between the parent device 11 and the child devices 22a to 22d. It is determined whether or not the slave units 22a to 22d are separated by a certain distance or more. For example, the master unit 11 can determine whether or not the master unit 11 and the slave units 22a to 22d are separated by a certain distance or more based on the reception levels of the radio waves transmitted from the slave units 22a to 22d. .

Then, the control unit 113 operates the alarm unit 116 according to the designation of the alarm switching unit 13 and is determined by the timer 115 when the distance between the parent device 11 and the child devices 22a to 22d is more than a certain distance. An alarm can be sounded only for a time, or the vibration generating unit 117 can be operated to generate a vibration for a time determined by the timer 115.
Thereby, it is possible to determine whether or not the master unit 11 and the slave units 22a to 22d are separated by a certain distance or more by performing direct communication between the master unit 11 and the slave units 22a to 22d. For this reason, the handset 22a to 22d is attached to each portable item such as the mobile phone 21a, the personal computer 21b, the USB memory 21c, and the bag 21d, and the parent unit 11 is kept at hand, so that an alarm is immediately given if the carried item is lost. It is possible to prevent the loss of all these items while suppressing the enlargement of the system configuration.

FIG. 3 is an external view showing a schematic configuration of a loss / theft prevention device according to the second embodiment of the present invention.
In FIG. 3, the loss / theft prevention device is provided with a parent device 31 and child devices 42a to 42d, and the parent device 31 can directly communicate with the child devices 42a to 42d, respectively. Here, the subunit | mobile_unit 42a-42d can each be attached and used for the mobile telephone 41a, the wallet 41b, the shoes 41c, and the umbrella 41d, for example.

  The master unit 31 includes a display unit 32 for displaying data, a slave unit search unit 33 for searching for a slave unit, a selection button 34 for selecting display data, a SET button 34a for determining data, and an alarm on / off function. An alarm on / off switch 35 for setting a distance, a distance individual setting button 36 for individually setting a detection distance between the parent device 31 and the child devices 42a to 42d for generating an alarm, and an alarm A distance batch setting button 37 for collectively setting a detection distance between the master unit 31 and the slave units 42a to 42d for all the slave units 42a to 42d, and a volume setting lever for setting the volume of the alarm 38 is provided. The alarm on / off can be set at once by the alarm on / off switch 35, or can be set for each of the slave units 42a to 42d registered using the selection button 34 and the SET button 34a. it can.

FIG. 4 is a block diagram showing a schematic configuration of a loss / theft prevention device according to the second embodiment of the present invention.
4, the base unit 31 in FIG. 3 includes an antenna 131, a communication unit 132 that performs communication between the handset units 42a to 42d, and a communication state between the base unit 31 and the handset units 42a to 42d. A distance determination unit 134 for determining whether or not the master unit 31 and the slave units 42a to 42d are separated from each other by a certain distance, a timer 135 for measuring time, an alarm unit 136 for generating an alarm, and a distance setting table 139a A storage unit 139 that stores data and a control unit 133 that performs overall control of these blocks are provided. In the distance setting table 139a, a detection distance from the parent device 31 set for each of the child devices 42a to 42d can be set.

On the other hand, the slave unit 42a of FIG. 3 includes an antenna 43, a communication unit 44 that communicates with the master unit 31, an alarm unit 46 that generates an alarm, and an ID storage unit 47 that stores an ID unique to the slave unit 42a. And the control part 45 which performs the overall control of these blocks is provided. In addition, the subunit | mobile_unit 42b-42d can also take the structure similar to the subunit | mobile_unit 42a.
When the base unit 31 is attached to the mobile phone 41a, the wallet 41b, the shoe 41c, and the umbrella 41d with the base unit 31 attached to the mobile phone 41a and the umbrella 41d, and the power switch 39 is turned on, Communication is established with 42a-42d, respectively. The storage unit 139 of the parent device 31 stores in advance an ID unique to the child devices 42a to 42d and an initial value of the detection distance.

Further, when a new child device is newly added, the new child device is brought closer to the parent device 31 and communication is established, so that the parent device 31 receives an ID unique to the new child device, and the ID and The initial value of the detection distance is stored in the storage unit 139.
There are the following two methods for changing the initial value of the detection distance stored in advance. One is an individual setting. When the selection buttons 34 are operated to select the slave units 42a to 42d to be set and the individual distance setting button 36 is pressed, the distance determination unit 134 determines the distance between the selected slave units 42a to 42d and the master unit 31. The distance is stored in the storage unit 139. The other is a batch setting. When the distance batch setting button 37 is pressed, the distance determination unit 134 sequentially determines the distance to the parent device 31 for all the child devices 42 a to 42 d registered in the parent device 31, and stores the distance in the storage unit 139. To do.

  The distance determination unit 134 sequentially determines for each one of the child devices 42a to 42d whether the distance between the parent device 31 and the child devices 42a to 42d is greater than the detection distance + α stored in the storage unit 139. When it is determined that the distance is equal to or greater than the detection distance + α, the control unit 133 operates the alarm unit 136 and can sound an alarm for a time determined by the timer 135. Here, α is a margin value for preventing false alarms, and can be set for each of the slave units 42a to 42d by the selection button 34 and the SET button 34a.

When the handset searching unit 33 is pressed when an alarm is sounded, the control unit 133 stores, from the storage unit 139, an ID unique to the handset 42a to 42d that is separated from the base unit 31 by a certain distance + α or more. read out. And the communication part 132 transmits an alarm operation instruction | command with the ID with respect to the subunit | mobile_unit 42a-42d identified by the ID.
When the alarm operation command is sent from the master unit 31 together with the ID, the communication unit 44 of the slave units 42 a to 42 d receives the alarm operation command together with the ID and sends it to the control unit 45. Then, the control unit 45 determines whether the ID received by the communication unit 44 matches the own ID, and when the ID received by the communication unit 44 matches the own ID, Based on the alarm operation command sent from the master unit 31, the alarm unit 46 can be operated to sound an alarm. And if the alarm of the subunit | mobile_unit 42a-42d rings, the user holding the main | base station 31 can search the subunit | mobile_unit 42a-42d based on the alarm sound emitted from the subunit | mobile_unit 42a-42d.

  In addition, when a carry item is not found, the selection unit 34 selects the slave units 42a to 42d and presses the slave unit search unit 33, the control unit 133 assigns a unique ID to the selected slave units 42a to 42d. Read from the storage unit 139. And the communication part 132 transmits an alarm operation instruction | command with the ID with respect to the subunit | mobile_unit 42a-42d identified by the ID.

  When the alarm operation command is sent from the master unit 31 together with the ID, the communication unit 44 of the slave units 42 a to 42 d receives the alarm operation command together with the ID and sends it to the control unit 45. Then, the control unit 45 determines whether the ID received by the communication unit 44 matches the own ID, and when the ID received by the communication unit 44 matches the own ID, Based on the alarm operation command sent from the master unit 31, the alarm unit 46 can be operated to sound an alarm. And if the alarm of the subunit | mobile_unit 42a-42d rings, the user holding the main | base station 31 can search the subunit | mobile_unit 42a-42d based on the alarm sound emitted from the subunit | mobile_unit 42a-42d.

  Thereby, it is possible to determine whether or not the distance between the parent device 31 and the child devices 42a to 42d is more than a certain distance by performing direct communication between the parent device 31 and the child devices 42a to 42d. In addition, it is possible to vary the distance at which the alarm sounds for each type of article. For this reason, by attaching the handset 42a to 42d to the carry-on item and keeping the base unit 31 at hand, it is possible to receive an alarm immediately if the carry-on item is lost, while suppressing an increase in the scale of the system configuration. It becomes possible to prevent the loss of carry-on items.

FIG. 5 is an external view showing a schematic configuration of a loss / theft prevention device according to the third embodiment of the present invention.
In FIG. 5, the loss / theft prevention device is provided with a parent device 51 and child devices 62a to 62d, and the parent device 51 can directly communicate with the child devices 62a to 62d, respectively. Here, the subunit | mobile_unit 62a-62d can be attached and used for the mobile phone 61a, the wallet 61b, the shoes 61c, and the umbrella 61d, respectively, for example.

  The master unit 51 includes a display unit 52 for displaying data, a selection button 54 for selecting display data, a SET button 54a for determining data, an alarm on / off switch 55 for setting on / off of an alarm, an alarm A distance individual setting button 56 for individually setting the detection distance between the parent device 51 and the child devices 62a to 62d for each of the child devices 62a to 62d, and the parent device 51 and the child for generating an alarm. A distance batch setting button 37 for collectively setting a detection distance between the devices 62a to 62d for all the slave devices 62a to 62d and a volume setting lever 58 for setting the volume of an alarm are provided.

FIG. 6 is a block diagram showing a schematic configuration of a loss / theft prevention device according to the third embodiment of the present invention.
In FIG. 6, the parent device 51 of FIG. 5 includes an antenna 151, a communication unit 152 that performs communication between the child devices 62 a to 62 d, and a communication state between the parent device 51 and the child devices 62 a to 62 d. A distance determination unit 154 that determines whether or not the master unit 51 and the slave units 62a to 62d are separated from each other by a certain distance, a timer 155 that measures time, an alarm unit 156 that generates an alarm, the master unit 51 and the slave unit A speed difference determination unit 157 that determines whether or not a speed difference between the parent device 51 and the child devices 62a to 62d is equal to or greater than a certain value based on a change state of a communication state between the devices 62a to 62d; A storage unit 159 that stores a table 159a and the like and a control unit 153 that performs overall control of these blocks are provided. Note that the distance setting table 159a can store the detection distance from the parent device 51 set for each of the child devices 62a to 62d.

On the other hand, the slave unit 62a in FIG. 5 includes an antenna 63, a communication unit 64 that communicates with the master unit 51, an alarm unit 65 that generates an alarm, and an ID storage unit 67 that stores an ID unique to the slave unit 62a. A control unit 66 that performs overall control of these blocks is also provided. In addition, the subunit | mobile_unit 62b-62d can also take the structure similar to the subunit | mobile_unit 62a.
Then, with the parent device 51 attached to itself, the child devices 62a to 62d are attached to the mobile phone 61a, the wallet 61b, the shoes 61c, and the umbrella 61d, respectively, and the power switch 59 is turned on. Communication is established between 62a-62d. In the storage unit 159 of the parent device 51, an ID unique to the child devices 62a to 62d and an initial value of the detection distance are stored in advance.

Further, when a new child device is added, by bringing the new child device closer to the parent device 51 and establishing communication, the parent device 51 receives an ID unique to the new child device, and the ID and The initial value of the detection distance is stored in the storage unit 159.
There are the following two methods for changing the initial value of the detection distance stored in advance. One is an individual setting. When the selection buttons 54 are operated to select the child devices 62a to 62d to be set and the individual distance setting button 56 is pressed, the distance determination unit 154 determines the distance between the selected child devices 62a to 62d and the parent device 51. The distance is stored in the storage unit 159. The other is a batch setting. When the distance batch setting button 57 is pressed, the distance determination unit 154 sequentially determines the distance from the parent device 51 for all the child devices 62a to 62d registered in the parent device 51, and the distance is stored in the storage unit 159. To do.

  At the same time, the distance determination unit 154 determines whether the distance between the parent device 51 and the child devices 62a to 62d is more than a certain distance based on the communication state between the parent device 51 and the child devices 62a to 62d. The determined distance is stored in the storage unit 159. This process is performed at regular intervals. Furthermore, the speed difference determination unit 157 includes the distance (previous distance) between the parent device 51 and the child devices 62a to 62d stored in the storage unit 139 in the previous processing cycle, and the distance determination unit 154 in the current processing. The difference between the distance (current distance) between the parent device 51 and the child devices 62a to 62d determined is calculated by dividing the value by the processing cycle, and the speed difference between the parent device 51 and the child devices 62a to 62d. calculate. That is, the speed difference between the parent device 51 and the child devices 62a to 62d = (current distance−previous distance) / processing cycle.

Then, the distance determination unit 154 sequentially determines whether or not the distance between the parent device 51 and the child devices 62a to 62d is greater than or equal to the detection distance + α stored in the storage unit 159 for each of the child devices 62a to 62d. judge.
When there is a slave unit 62a to 62d in which the speed difference between the control unit 153 and the base unit 51 is a predetermined value or more in a state where the control unit 153 is apart from the base unit 51 by a certain distance + α or more, the alarm unit 156 And an alarm can be sounded for a time determined by the timer 155. In addition, the control unit 153 stores IDs unique to the slave units 62a to 62d in which the speed difference from the master unit 51 is equal to or greater than a certain value while being apart from the master unit 51 by a certain distance or more. Read from.

  And the communication part 152 transmits an alarm action command with the ID with respect to the subunit | mobile_unit 62a-62d specified by the ID. When the alarm operation command is sent from the master unit 51 together with the ID, the communication unit 64 of the slave units 62a to 62d receives the alarm operation command together with the ID and sends it to the control unit 66. Then, the control unit 66 determines whether the ID received by the communication unit 64 matches the own ID, and when the ID received by the communication unit 64 matches the own ID, Based on the alarm operation command sent from the master unit 51, the alarm unit 65 can be operated to sound an alarm. And if the alarm of the subunit | mobile_unit 62a-62d rings, the surroundings of the theft of the subunit | mobile_unit 62a-62d can be notified to the circumference | surroundings based on the alarm sound emitted from the subunit | mobile_unit 62a-62d.

  Thereby, it is possible to determine whether or not the distance between the parent device 51 and the child devices 62a to 62d is more than a certain distance by performing direct communication between the parent device 51 and the child devices 62a to 62d. At the same time, it can be determined whether or not the speed difference between the master unit 51 and the slave units 62a to 62d is equal to or greater than a certain value, and when the slave units 62a to 62d are lost, the slave units 62a to 62d are stopped. It is possible to identify whether or not the slave units 62a to 62d are moving in the opposite direction to the master unit 51. For this reason, it is possible to distinguish whether the carry-on item is lost or stolen by attaching the slave units 62a to 62d to the carry-on item and keeping the master unit 51 at hand, thereby suppressing an increase in the scale of the system configuration. On the other hand, it is possible to prevent loss and theft of carry-on items.

  In the above-described embodiment, the speed difference between the parent device 51 and the child devices 62a to 62d is equal to or greater than a certain value based on the change state of the communication state between the parent device 51 and the child devices 62a to 62d. Although the method for determining whether or not the above has been described, a speed sensor may be provided in the parent device 51 to calculate the speeds of the child devices 62a to 62d themselves. As a result, even when the parent device 51 is moving, it is possible to determine whether the child devices 62a to 62d are stationary or moving, and to improve the determination accuracy of the theft of carried items. Can do.

FIG. 7 is an external view showing a schematic configuration of a loss / theft prevention device according to the fourth embodiment of the present invention.
In FIG. 7, the loss / theft prevention device is provided with a parent device 72 and child devices 82a to 82d, and the parent device 72 can directly communicate with the child devices 82a to 82d, respectively. Here, the parent device 72 can be constituted by a chip part such as a custom chip. For example, the parent device 72 can be incorporated in a portable item such as a mobile phone 71. Moreover, the subunit | mobile_unit 82a-82d can each be attached and used for the notebook personal computer 81a, the wallet 81b, the shoes 81c, and the umbrella 81d, for example.

Then, with the mobile phone 71 in which the parent device 72 is incorporated, the child devices 82a to 82d are attached to the notebook computer 81a, the wallet 81b, the shoes 81c, and the umbrella 81d, respectively. When communication is established with each of 82a to 82d, the parent device 72 determines whether or not the child devices 82a to 82d are separated by a certain distance or more based on the communication state with the child devices 82a to 82d. judge. Then, when the master unit 72 and the slave units 82a to 82d are separated from each other by a certain distance, the master unit 72 issues an alarm on the master unit 72 side or instructs the slave units 82a to 82d to sound an alarm. You can do it.
Here, by configuring the parent device 72 with a chip component such as a custom chip, it becomes possible to incorporate the parent device 72 into a mobile communication terminal such as a mobile phone 71, and the mobile device is lost without impairing the portability of the mobile communication terminal. / The range of articles to which the antitheft device can be applied can be expanded.

It is an external view which shows schematic structure of the loss / theft prevention apparatus which concerns on 1st Embodiment of this invention. It is a block diagram which shows schematic structure of the loss / theft prevention device which concerns on 1st Embodiment of this invention. It is an external view which shows schematic structure of the loss / theft prevention apparatus which concerns on 2nd Embodiment of this invention. It is a block diagram which shows schematic structure of the loss / theft prevention apparatus which concerns on 2nd Embodiment of this invention. It is an external view which shows schematic structure of the loss / theft prevention apparatus which concerns on 3rd Embodiment of this invention. It is a block diagram which shows schematic structure of the loss / theft prevention apparatus which concerns on 3rd Embodiment of this invention. It is an external view which shows schematic structure of the loss / theft prevention apparatus which concerns on 4th Embodiment of this invention.

Explanation of symbols

11, 31, 51, 72 Base unit 17, 39, 59 Power switch 12, 35, 55 Alarm on / off switch 13 Alarm switching unit 14 Alarm sound setting unit 15, 38, 58 Volume setting unit 16 Operating distance setting unit 21a, 41a, 61a, 71 Mobile phone 21b, 81a Personal computer 21c USB memory 21d Bag 22a-22d, 42a-42d, 62a-62d, 82a-82d Slave unit 23, 111, 43, 131, 63, 151 Antenna 24, 112, 44, 132, 64, 152 Communication unit 113, 45, 133, 66, 153 Control unit 114, 134, 154 Distance determination unit 115, 135, 155 Timer 116, 46, 136, 65, 156 Alarm unit 117 Vibration generation unit 32 , 52 Display unit 33 Remote device search unit 34, 5 Selection button 34a, 54a SET button 36, 56 Distance individual setting button 37, 57 Distance batch setting button 41b, 61b, 81b Wallet 41c, 61c, 81c Shoes 41d, 61d, 81d Umbrella 47, 67 ID storage unit 139, 159 Storage unit 139a, 159a Distance setting table 157 Speed difference determination unit

Claims (4)

Based on the communication state between the parent device and the child device, distance determining means for determining whether or not the parent device and the child device are separated from each other by a certain distance;
A loss / theft prevention device comprising: an alarm generation means for generating an alarm on the master unit side when the master unit and the slave unit are separated by a certain distance or more. Distance setting means for individually setting the distance between the parent device and the child device for each child device;
Distance determination means for individually determining whether or not the distance between the parent device and the child device is greater than or equal to a set distance based on a communication state between the parent device and the child device When,
Loss / theft prevention characterized by comprising alarm generating means for generating an alarm on the master unit side and the slave unit side when the master unit and the slave unit are separated by a set distance or more apparatus. Based on the communication state between the parent device and the child device, distance determining means for determining whether or not the parent device and the child device are separated from each other by a certain distance;
A speed difference determination means for determining whether a speed difference between the parent device and the child device is a predetermined value or more based on a change state of a communication state between the parent device and the child device;
When the base unit and the slave unit are separated from each other by a certain distance or more and a speed difference between the master unit and the slave unit is a certain value or more, an alarm is generated on the master unit side and the slave unit side. A loss / theft prevention device comprising: an alarm generation means for generating.   The loss / theft prevention device according to any one of claims 1 to 3, wherein the base unit is a chip part incorporated in a carried item.

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