WO2008047426A1

WO2008047426A1 - Bidirectionality confirming system, bidirectionality confirming method, and poor memory preventing method using the former

Info

Publication number: WO2008047426A1
Application number: PCT/JP2006/320743
Authority: WO
Inventors: Kuniaki Makabe
Original assignee: Bestac Limited
Priority date: 2006-10-18
Filing date: 2006-10-18
Publication date: 2008-04-24
Also published as: JPWO2008047426A1

Abstract

Provided is a bidirectionality confirming system capable of confirming the bidirectionality easily between a master device and a slave device. The bidirectionality confirming system includes a master device and at least one slave device capable of communicating with the master device. These master device and slave device take synchronizations with each other, when the communications are established, but issue warnings in voices, lights or vibrations when they cannot receive signals from partners.

Description

Bi-directional confirmation system, bi-directional confirmation method and method for preventing forgetting using this

Technical field

The present invention relates to a bidirectional confirmation system between a master device and a slave device, and in particular, a bidirectional confirmation system used for a mobile phone, a laptop or palmtop computer, and other portable objects, humans, and animals. And a warning system using the same.

Background art

[0002] Objects such as mobile phones, laptop computers, normtop computers, bags, cases, etc. contain important economic and equivalent property and personal information. As a technique for preventing such misplacement of an object, for example, Patent Document 1 discloses that when a knock or the like is attached around the person and moves against the intention of the person due to bow I tapping, or the like. Disclosed is a misplacement prevention device that emits an alarm by an alarm sound or buzzer sound when an object is left behind. This misplacement prevention device will trigger a buzzer, voice, or vibrator if the unit and slave units are unable to transmit and receive wirelessly, or if the distance between the unit and slave units exceeds a certain level. It has become so.

[0003] Patent Document 2 relates to an alarm device for preventing eavesdropping and misplacement, and when an alarm device and a carrying device are used as a single thread and the distance between the two devices is detected to be greater than a certain value, an alarm is issued from the speaker of the alarm device. Audio is output. The alarm sound outputs the sound data stored in the memory in multiple dialects and languages.

[0004] Patent Document 3 relates to a baggage-forgetting prevention system. When a bag containing baggage with a wireless tag passes through a doorway of a building, information in the wireless tag is read, and the read information is stored in advance. By checking against the prepared information, the shortage of baggage is announced by voice or on the screen.

[0005] Patent Document 4 corrects a shift in synchronous data and reliably prevents a terminal from being left behind by a vibrator serving as an incoming call notification means. Patent Document 5 relates to a portable alarm generation system device, including a transmission device using a wireless IC tag and a portable alarm generation device, An alarm is sounded when the transmitter and the alarm generator are separated from each other.

[0006] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-233876

Patent Document 2: Japanese Patent Laid-Open No. 2003-281638

Patent Document 3: Japanese Patent Application Laid-Open No. 2004-213130

Patent Document 4: Japanese Patent Laid-Open No. 11-234751

Patent Document 5: Japanese Patent Laid-Open No. 2005-309954

Disclosure of the invention

Problems to be solved by the invention

However, conventional misplacement prevention devices, alarm systems, and the like have the following problems. For example, as disclosed in Patent Document 2, in the case of a system in which a parent device and a child device are used in pairs, in order to use a plurality of child devices, a corresponding number of parent devices are required, and a large number of child devices are required. It was practical and powerful for systems that needed a machine. In addition, if the relationship between the master unit and the slave unit is fixed one-to-one, if the slave unit is lost, the master unit itself will not be used, and the master unit and the slave unit will be purchased again. It had to be uneconomical.

[0008] Furthermore, as shown in Patent Documents 3 to 5, when the slave unit simply has an ID (identification information) such as a wireless tag, the slave unit cannot perform two-way communication. There is a problem that there is no power to confirm the machine. For example, even if the notion power of the master unit is turned off and the function is disabled, the slave unit does not know.

[0009] The present invention solves such a conventional problem, and it is possible to easily confirm the bidirectionality between the master device (master device) and the slave device (slave device). It is an object of the present invention to provide a bidirectionality confirmation system and a bidirectionality confirmation method capable of easily setting the relationship of a plurality of slave devices with respect to the master device.

Means for solving the problem

[0010] The bidirectional confirmation system according to the present invention includes a master device and at least one slave device capable of communicating with the master device, and the master device and the slave device are synchronized with each other when communication is established. The master device and the slave device each issue a warning when the other party's signal cannot be received.

[0011] Preferably, the master device and the slave device are based on a time when communication is first established. As a standard, communication is performed at regular time intervals. The slave device also adds information that establishes communication to the identification signal. Also, if the signal from the slave device cannot be confirmed within a certain time after the master device is turned on! /, The slave identification information stored in the master device is initialized. When the master device receives the signal of at least one slave device continuously after the initialization of the identification information or when the power is turned on next time and the force establishes communication within a certain time, and at least the slave device receives the signal. Memorizes the identification information of one slave device and establishes communication with the at least one slave device.

Preferably, the master device includes transmission / reception means for transmitting / receiving radio signals, storage means for storing identification information of the slave apparatus, warning means for issuing a warning, synchronization means for synchronizing with the slave apparatus, and control means. The control means receives identification information and a reference clock from the slave device via the transmission / reception means, and establishes and receives communication when the received identification information matches the identification information stored in the storage means. It synchronizes with the slave device based on the reference clock and sends an acknowledge signal to the slave device. In addition, after establishing communication with the slave device, communication with the slave device is possible at regular time intervals, and when the communication with the slave device cannot be established, the warning means is warned.

[0013] Preferably, the slave device includes transmission / reception means for transmitting / receiving a radio signal, storage means for storing identification information, warning means for issuing a warning, synchronization means and control means for synchronizing with the master device. The control means transmits the new information obtained by adding the communication establishment information to the identification information stored in the storage means and the reference clock generated by the synchronization means via the transmission / reception means, and the transmitted identification Communication is established when an acknowledge signal for information is received by the master device, and the device enters a sleep state for a certain period of time. New information including communication establishment information is retained until the power is turned off.

[0014] Preferably, each of the master device and the slave device includes a case and a circuit board accommodated in the case, and a noise generator is attached to one surface side of the circuit board. The antenna of the transmission / reception means is attached to the surface side. Each of the master device and the slave device is driven by a battery accommodated in the case.

[0015] Preferably, the storage unit of the master device stores the identification information of the slave device. Includes replaceable non-volatile memory. When the communication with the slave device cannot be established, the control means of the master device erases the identification information stored in the nonvolatile memory, and when the communication with the new slave device is established, the identification information of the slave device is nonvolatile. Write to sex memory. Further, when communication with a plurality of new slave devices is established, the control means writes identification information of each of the plurality of slave devices in the nonvolatile memory. Preferably, the master device and the slave device include a light output device, a sound output device and a vibration device for issuing a warning.

[0016] A bidirectionality confirmation method according to the present invention includes a master device having a bidirectional communication function, and at least one slave device capable of communicating with the master device and having a bidirectional communication function. Transmitting a radio signal including identification information and a reference clock from the slave device, and when the master device receives the radio signal, the master device collates the received identification information, and the slave device according to the result of the collation Establishing communication with the slave device and synchronizing with the slave device based on the received reference clock, sending an acknowledge signal indicating establishment of communication from the master device to the slave device, and a certain period after establishing communication The master device and the slave device each have a step of issuing a warning when the other party's signal cannot be received.

[0017] Preferably, the bidirectional confirmation method further includes a step in which the master device enters a sleep state for a certain period after transmission of the acknowledge signal, and a step in which the master device enters a reception standby state in which a signal from the slave device is received after sleeping. The master device issues a warning when it cannot receive the signal from the slave device within a certain period of the standby state.

[0018] More preferably, the bidirectional confirmation method includes a step in which the slave device enters a sleep state for a predetermined period after receiving the acknowledge signal, and a step of transmitting a radio signal including identification information and a reference clock after the slave device power S sleep. And the slave device becomes a reception standby state for receiving the acknowledge signal from the master device, and when the slave device cannot receive the acknowledge signal of the master device within a certain period of the reception standby state, the slave device Issue a warning. Furthermore, the forgetfulness prevention method of the present invention can be achieved by using the above-described bidirectional confirmation method.

The invention's effect [0019] According to the present invention, when communication between the master device and the slave device is established by bidirectional communication between the master device and the slave device, and communication between the master device and the slave device can no longer be established. Since warnings are issued in each case, it is possible to check the status of the master device from the slave device and vice versa, the status of the slave device power master device in both directions.

BEST MODE FOR CARRYING OUT THE INVENTION

[0020] The best mode of the present invention will be described in detail with reference to the drawings.

Example

FIG. 1 is a diagram illustrating a connection example of a master device and a slave device of the bidirectionality confirmation system according to the embodiment of the present invention. In the present embodiment, n slave devices 20-1 to 20-n are associated with one master device 10, and bidirectional wireless communication between both devices can be established. In the following, in order to facilitate the description, one typical slave device 20 is used for the description.

[0022] As shown in FIG. 2 (a), the master device 10 includes an upper cover 30 made of resin with one rectangular surface opened, and a lower cover made of resin having a shape substantially equal to the upper cover 30. 32, and a joint surface 34 between the upper cover 30 and the lower cover 32 is connected by ultrasonic welding or the like, thereby forming a rectangular space inside. As will be described later, a circuit board, a battery, an antenna, a vibrator, an LED element, a speaker, and the like are accommodated in the internal space. A small opening 36 for outputting a beep sound is formed on the surface of the upper cover 30, and a window 38 is formed on the surface of the lower cover 32 to transmit light when the LED element emits light. . As shown in FIG. 2 (b), the slave device 20 differs from the force master device having the same configuration as the master device 10 in that a switch 223 for switching the RF output is provided as necessary. It is a point. In addition, the opening 36 for the beep sound can be designed with consideration given to providing an opening on the side surface of the strap recess without opening it alone.

FIG. 3 is a schematic longitudinal sectional view of the master device 10. A circuit board 42 is attached to the internal space 40 formed by the upper cover 30 and the lower cover 32, and a battery 44, a vibrator 46, an LED element 48, and a beep sound are generated on the upper surface of the circuit board 42. Sound generator 50 is installed. The LED element 48 is mounted on the back of the circuit board 42. The antenna pattern 52 is formed. The antenna pattern 52 is preferably arranged so as to move away from a vibrator and other parts and vibrations that affect transmission and reception. The other circuit components are not shown. The slave device 20 also has the same internal configuration as the master device 10.

FIG. 4 (a) is a block diagram showing an electrical configuration of the master device. The master device 10 includes an RF transmission / reception unit 100 that transmits and receives radio signals via an antenna 102 and a control unit 110. The internal configuration of the control unit 110 is shown in FIG. 4 (b). The control unit 110 includes an interface 120 for inputting / outputting a signal received by the RF transmitting / receiving unit 100 or a signal transmitted from the RF transmitting / receiving unit 100, and a power switch 122 for switching on / off the battery power of the master device. The LED 124, the vibrator 126 and the drive unit 130 that drives the sound generator 128, the clock signal generator 132 that generates and counts the clock signal based on the internal oscillator, and synchronizes with the slave device, And a control unit 136 for controlling.

[0025] The memory 134 includes a ROM and a RAM, and stores a program and data for the master device to perform bidirectionality confirmation. More preferably, the memory 134 includes a non-volatile memory in which the identification information (ID) of the slave device to be confirmed by the master device is stored. This identification information can be rewritten under certain conditions.

[0026] The RF transceiver 100 is preferably capable of transmitting and receiving 2.4 GHz digital signals, and the distance that can be transmitted and received is about 20 meters. The signal to be sent and received is, for example, 24-bit data.

FIG. 5 (a) is a block diagram showing the electrical configuration of the slave device, and FIG. 5 (b) is a block diagram showing the internal configuration of the control unit. The slave device 20 includes an RF transmission / reception unit 200 connected to the antenna 202 and a control unit 210. The control unit 210 inputs / outputs a signal received by the RF transmission / reception unit 200 or a signal transmitted from the RF transmission / reception unit 200. Interface 220, power switch 222 for switching on / off the battery power of the slave device, RF output switching switch 223, drive unit 230 for driving LED 224, vibrator 226, and sound output unit 228, A clock management unit 232 that generates and counts clock signals based on the internal oscillator and synchronizes with the master device. And a control unit 236 for controlling.

[0028] The memory 234 includes a ROM and a RAM, and stores a program and data for the slave device to confirm bidirectionality. More preferably, the memory 234 includes a ROM that stores identification information (ID) for identifying itself, which identification information is fixed and cannot be rewritten.

Next, the bidirectional confirmation operation by the master device and the slave device will be described with reference to a flow chart. Fig. 6 shows the operation flow until communication between the master device and the slave device is established. Fig. 7 shows the operation flow for confirming bidirectionality after communication is established.

[0030] First, when the battery power of the master device is turned on, the control unit 136 of the master device initializes the inside (step S101) and enters a standby state in which a signal from the slave device can be received (step S). 102). The initialization includes, for example, the clearing of the reference clock by the clock management unit 232, etc., but if the identification information of the slave device has already been stored, it is not cleared at this point.

[0031] Next, when the battery power of the slave device is turned on, the control unit 236 of the slave device initializes the inside (step S201), and the wireless signal including the identification information (ID) and the reference clock held by itself S1 is transmitted via the RF transceiver 200 (step S202). As described above, the identification information is uniquely assigned to each slave device. At this point, the communication establishment information (flag) is not included. Further, when transmitting the radio signal S1, the control unit 236 includes the reference clock CLK generated by the clock management unit 232 in the radio signal S1. The radio signal S1 is also transmitted by the slave device and is received by the master device in the standby state.

[0032] The control unit 136 of the master device determines whether the identification information (ID) included in the radio signal S1 received via the RF transmission / reception unit 100 includes communication establishment information (flag)! / (Step S 105). If communication establishment information is included, the wireless signal S1 is already a slave device that has already established communication with another master device, so it is ignored and returns to the reception standby state again. If the communication establishment flag is not included, it is checked whether or not it matches the identification number held by the master device itself (step S106). If it doesn't match, The slave device registers identification information (ID) as a new slave device (step S107). When the identification information (ID) matches or is newly registered, the control unit 136 recognizes the slave device to be confirmed, that is, establishes communication with the slave device. Then, the clock management unit 136 is synchronized according to the reference clock CLK included in the radio signal S 1 (step S108). As a result, the master device and the slave device are operated in substantially the same time.

[0033] The control unit 136 of the master device transmits an acknowledge signal S2 including the same identification information as the identification information (ID) received from the slave device to inform the slave device that communication has been established. (Step S109). After transmitting the acknowledge signal S2, the master device enters a sleep state for a certain period (step S110). In the sleep state, main electronic circuits are driven with low power consumption or power supply is stopped in order to reduce battery power consumption.

[0034] After transmitting the radio signal S1, the slave device is in a standby state for receiving the acknowledge signal S2 from the master device (step S203). When receiving the acknowledge signal S2 in this reception standby state, it is determined that communication with the master device has been established, communication establishment information (flag) is registered and held (step 204), and the sleep state is entered for a certain period of time (step 204). Step S205). This sleep period is approximately 2 seconds, and the reception waiting period is approximately 1 millisecond or less, and is synchronized with the master device.

Next, as shown in FIG. 7, the master device enters a standby state after receiving a signal from the slave device after a certain sleep state (step Sl ll). This sleep period is about 2 seconds, and the standby period is about 1 millisecond or less, and is synchronized with the slave device. When the slave device cannot receive any signal during the waiting period, the control unit 136 of the master device determines that the communication with the slave device cannot be confirmed, and the LED 124 and the vibrator 126 are connected via the drive unit 130. Drive beep sound output 128. As a result, a beep sound is output from the opening 36 of the upper cover 30 of the master device, light is emitted outward from the window 38 of the lower cover 32, the entire device is vibrated by the vibrator, and a warning is issued to the user ( Step S112). Preferably, the beep sound, light, and the like are output operation patterns that can recognize any of the plurality of slave devices. For example, a certain thread When identifying a slave device, the intermittent operation pattern of beep, light, and vibration is made different from the intermittent operation pattern used to identify other slave devices. As a result, the user holding the master device can easily recognize which slave device cannot establish communication.

[0036] At almost the same time when the master device also releases the sleep state force, the slave device force sleep state force is also released, and the control unit 236 of the slave device establishes communication with the identification information (ID) held by itself. The signal S3 including the information including the information (flag) and the reference clock is transmitted (step S206).

[0037] When receiving the wireless signal S3, the master device in the reception standby state checks whether or not the identification information included in the wireless signal S3 matches the identification information held by itself (step S). 113). In this case, since communication with the slave has already been established, the communication establishment information is not judged. If they do not match, it is not a slave device to be confirmed by the master device, so it again enters the reception standby state. If this repetition continues and the reception standby state exceeds a certain time, a warning is issued as described above that communication has been lost.

The master device synchronizes the clock management unit 136 according to the reference clock included in the signal S3, and adjusts the timer between the master device and the slave device (step S114). Next, the master device transmits an acknowledge signal S4 including the same identification information as the received identification information to the slave device (step S115), and then enters a sleep state for a certain period of time (step S116).

[0039] When the slave device receives the acknowledge signal S4 within a certain period (step S207), it determines that communication with the master device has been made and enters a sleep state for a certain period (step S209). On the other hand, when the acknowledge signal S4 cannot be received within a certain period, that is, when a timeout occurs, the slave device

It is determined that communication with the master device cannot be confirmed, and the LED 224, the vibrator 226, and the beep sound output 228 are driven via the drive unit 230. As a result, a beep sound is output from the opening 36 of the upper cover 30 of the slave device, light is emitted outward from the window 38 of the lower cover 32, the entire device is vibrated by the vibrator, and a warning is issued to the user. (Step S 208). Thus, according to the present embodiment, when communication between the master device and the slave device becomes impossible or impossible, a warning is issued in each of the master device and the slave device. Master / slave device! / And misalignment can also check the other device's abnormality. In the above embodiment, one master device and one slave device are shown. Of course, the master device can also confirm the bidirectionality of a plurality of slave devices.

[0041] Next, an example of rewriting the identification information of the master device will be described. The master device receives the signal from the slave for the first time after turning off the power switch 122 and cannot recognize it, or initializes it by operating a dedicated terminal and stores it in the memory 134. The identification information that has been stored can be deleted. The master device can write in the memory 134 the identification information of the slave device that communicates for the first time within a certain period of time after the power is turned on continuously after initialization. The first fixed period is the time required to turn on the power of multiple slave devices and is preferably about 30 seconds at the maximum. In addition, when the identification information is erased and initialized, it is desirable to notify the user with a beep sound, light, vibration, or the like. As a result, a new slave device can be changed as a slave device to be confirmed. For example, it is effective when a slave device is lost and changed to a new slave device.

[0042] The reason why the slave device is provided with the RF output switching switch 223 is that a warning is generated over a short distance depending on the purpose of use! / There may be cases. When the master device communicates with a plurality of slave devices, it is not easy to switch the reception sensitivity of each slave device on the master device side, so it is desirable to suppress the transmission output on the slave device side. Therefore, the RF output on the slave device side is controlled. For example, it is possible to simply use the force to physically insert the attenuation resistor in the RF output section, or adjust the level with the RF output control unit.

[0043] The bidirectionality confirmation system according to the present embodiment described above can be used as a device for preventing a misplaced portable device such as a mobile phone. In this case, the user himself holds the master device and attaches the slave device to the portable device. Then, the user misplaces the mobile device and moves it away from the site, ensuring communication between the master device and the slave device. If it becomes impossible to stand, a warning is issued for each of the master device and the slave device, so that the user notices that the portable device has been misplaced. The use of the master device and the slave device is arbitrary. For example, the parent may hold the master device and the child may hold the slave device. In this case, when the child leaves a certain distance, the parent receives the warning, and at the same time, the child also receives the warning, thereby preventing the lost child.

[0044] The preferred embodiment of the present invention has been described in detail above, but the present invention is not limited to the specific embodiment of the present invention, and is not limited to the specific embodiment of the present invention. Various modifications and changes are possible within the scope of the gist.

[0045] In the above embodiment, the master device and the slave device have a rectangular shape, but this is an example, and any shape may be used. In addition, although LEDs, vibrators, and beep sound output devices are used as devices for issuing warnings in the master device and slave devices, they are not necessarily limited to these devices.

Industrial applicability

[0046] The bidirectional confirmation system of the present invention can be used for management of a movable object, management of misplacement, placement, etc.

Brief Description of Drawings

FIG. 1 is a diagram showing a connection example between a master device and a slave device of a bidirectional confirmation system according to an embodiment of the present invention.

FIG. 2 (a) is an external perspective view of the master device according to the present embodiment, and FIG. 2 (b) is an overview perspective view of the slave device according to the present embodiment.

FIG. 3 is a cross-sectional view showing an internal configuration of a master device and a slave device according to the present embodiment.

FIG. 4 is a block diagram illustrating a configuration of a master device according to the present embodiment.

FIG. 5 is a block diagram showing a configuration of a slave device according to the present embodiment.

[Fig. 6] Fig. 6 is a diagram showing an operational flow of bidirectional confirmation using the master device and the slave device according to the present embodiment.

FIG. 7 is a diagram showing an operation flow for bidirectional confirmation using the master device and the slave device according to the present embodiment. Explanation of symbols

10: Master device 20—l to 20—n: Slave device

30: Upper cover 32: Lower cover

34: Joint surface 36: Opening

38: Window 40: Interior space

42: Circuit board 44: Nottery

46: Vibrator 48: LED element

50: Sound generator 52: Antenna pattern

100, 200: RF transceiver 102, 202: Antenna

110, 210: Control unit 120, 220: Interface

122, 222: Power switch 124, 224: LED

223: RF output switching switch

126, 226 Iblator 128, 228: Sound generator

130, 230: Drive unit 132, 232: Clock management

134, 234: Memory 136, 236: Control unit

Claims

The scope of the claims

[1] Master device;

Including at least one slave device that can communicate with the master device, and the master device and the slave device are synchronized with each other when communication is established, and the master device and the slave device are in a state where they cannot receive the other party's signal. An interactive confirmation system that issues warnings.

[2] The bidirectional confirmation system according to claim 1, wherein the master device and the slave device communicate with each other at a constant time interval with reference to a time when communication is first established.

[3] The identification information of the slave device stored in the master device is initialized when the signal of the slave device cannot be confirmed within a certain time after the power of the master device is turned on. Bidirectional confirmation system.

[4] The master device continues communication after initialization of identification information or establishes communication within a certain period of time after the power is turned on, and receives a signal from at least one slave device. 4. The bidirectional confirmation system according to claim 3, wherein identification information of the at least one slave device is stored to establish communication with the at least one slave device.

[5] The master device includes transmission / reception means for transmitting / receiving a radio signal, storage means for storing identification information of the slave device, warning means for issuing a warning, synchronization means and control means for synchronizing with the slave device,

The control means receives the identification information and the reference clock from the slave device via the transmission / reception means, and establishes and receives communication when the received identification information matches the identification information stored in the storage means. 5. The bidirectional confirmation system according to claim 1, wherein the bidirectional confirmation system synchronizes with the slave device based on the reference clock and transmits an acknowledge signal to the slave device. 6.

[6] The master unit control means determines whether or not the identification information transmitted from the slave device includes communication establishment information indicating that communication has already been established with another master device. 6. The bidirectional confirmation system according to claim 5, wherein communication with a slave device is established when communication establishment information is not included.

[7] The control means of the master device does not include communication establishment information, and 7. The bidirectional confirmation system according to claim 5 or 6, wherein when the match does not coincide, the identification information of the slave device is registered as identification information to be confirmed bidirectionally.

[8] The control means of the master device enables communication with the slave device at regular time intervals after establishing communication with the slave device, and makes the warning means warn when communication with the slave device cannot be established. The interactive confirmation system according to any one of 1 to 5.

[9] The slave device includes transmission / reception means for transmitting / receiving radio signals, storage means for storing identification information, warning means for issuing a warning, synchronization means for controlling synchronization with the master device, and control means,

The control means transmits the identification information stored in the storage means via the transmission / reception means and the reference clock generated by the synchronization means, and receives an acknowledge signal for the transmitted identification information from the master device. The bidirectional confirmation system according to any one of claims 1 to 8, wherein when the communication is established, identification information including communication establishment information establishing the communication is created, and the sleep state is set for a certain period.

10. The bidirectional confirmation system according to claim 9, wherein the control unit of the slave device transmits identification information including communication establishment information indicating that communication with another master device is established.

[11] The control unit of the slave device enables communication to the master device at regular time intervals after communication is established, and causes the warning unit to warn when communication with the master device cannot be established. 10. The interactive confirmation system according to any one of 10.

[12] Each of the master device and the slave device includes a case and a circuit board accommodated in the case, and a vibrator is attached to one surface side of the circuit board, and the other surface side of the circuit board is provided. The bidirectional confirmation system according to claim 1, wherein an antenna of the transmission / reception means is attached.

13. The bidirectional confirmation system according to claim 12, wherein each of the master device and the slave device is driven by a battery accommodated in the case.

14. The bidirectional confirmation system according to any one of claims 1 to 13, wherein the storage unit of the master device includes a rewritable nonvolatile memory that stores identification information of the slave device.

15. The bidirectional confirmation system according to claim 14, wherein the control unit of the master device writes identification information of the slave device in the nonvolatile memory when communication with a new slave device is established.

16. The bidirectional confirmation system according to claim 1, wherein the control means stores identification information of each of the plurality of slave devices in a nonvolatile memory.

[17] The bidirectional confirmation system according to any one of claims 1 to 16, wherein the master device and the slave device include a light output device, a sound output device, and a vibration device to issue a warning.

[18] When the master device is unable to establish communication with the slave device, the master device sends the warning means to the slave device from a plurality of slave devices with different operations for each of the slave devices of the light output device, the sound output device, and the vibration device. 18. The interactive confirmation system according to any one of claims 1 to 17, wherein:

[19] A method for confirming bidirectionality between master-slave devices, including a master device having a bidirectional communication function and at least one slave device capable of communicating with the master device and having a bidirectional communication function. There,

Transmitting a radio signal including slave device power identification information and a reference clock; and

When the master device receives the wireless signal, the master device collates the received identification information, establishes communication with the slave device according to the collation result, and synchronizes with the slave device based on the received reference clock. Steps,

A step of transmitting an acknowledge signal indicating communication establishment from the master device to the slave device;

When the other party's signal cannot be received within a certain period of time after establishing communication, the master device and the slave device each issue a warning,

A bidirectional confirmation method.

[20] The master device determines whether or not the received identification information includes communication establishment information indicating that communication with another master device has been established. 20. The interactive confirmation method according to claim 19, further comprising a step of collating identification information.

[21] The master device includes a step of registering the identification information of the slave device as the identification information of the slave device to be confirmed when the communication establishment information is not included and the verification of the identification information does not match. The interactive confirmation method as described in 19 or 20.

[22] The bidirectionality confirmation method further includes a step in which the master device is in a sleep state for a certain period after transmitting the acknowledge signal;

Including the step of becoming a reception standby state of receiving a signal of the slave device power after the master device power S sleep,

20. The bidirectional confirmation method according to claim 19, wherein the master device issues a warning when it cannot receive a signal from the slave device within a certain period of the standby state.

[23] The bidirectional confirmation method further includes a step in which the slave device is in a sleep state for a certain period after receiving the acknowledge signal;

A slave device transmits a wireless signal including identification information and a reference clock after sleeping; and

The slave device receives a master device power acknowledgment signal and enters a reception standby state.

23. The bidirectional confirmation method according to claim 22, wherein the slave device issues a warning when the acknowledge signal of the master device cannot be received within a predetermined period of the reception standby state.

[24] The bidirectional confirmation method according to any one of claims 19 to 23, wherein the master device and the slave device give warnings of the light output device, the sound output device, and the vibration device.

[25] A forgetfulness prevention method using the bidirectionality confirmation method according to any one of claims 19 to 25.