CN117808020A - Information reading device, wireless tag, information reading system, information reading method, and computer-readable recording medium - Google Patents

Abstract

The invention provides an information reading device, a wireless tag, an information reading system, an information reading method and a computer readable recording medium. An information reading device mounted on a mobile body for loading a packaging box comprises: a transmitting/receiving unit that generates a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag provided in the packaging box and the contents of the packaging box, and that receives a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the transmission/reception unit.

Description

Information reading device, wireless tag, information reading system, information reading method, and computer-readable recording medium

Technical Field

The invention relates to an information reading device, a wireless tag, an information reading system, an information reading method and a computer readable recording medium.

Background

Conventionally, a moving body such as an automatic transport vehicle (AGV: automatic Guided Vehicle) or a guided robot that performs autonomous traveling is known. In addition, in the near future, in order to realize complete automation of transport typified by an AGV, a technique for automatically detecting a deviation of a packing box during transport is demanded.

Patent document 1 discloses a traveling carriage having a load measuring unit for measuring the weight and moment of a load, an acceleration measuring unit for measuring the acceleration of the traveling carriage, and a calculating unit for calculating the position of the center of gravity of the load, and performing acceleration/deceleration or speed control based on the weight and the position of the center of gravity of the load.

However, in patent document 1, although the balance of the entire load can be detected, it is impossible to distinguish between the displacement of the load itself and the displacement of the contents of the load.

Patent document 1: japanese patent application laid-open No. 2019-131374

Disclosure of Invention

The invention aims to provide an information reading device, a wireless tag, an information reading system, an information reading method and an information reading program, which can distinguish the deviation of a packing box and the deviation of the content of the packing box.

An information reading apparatus according to the present invention is an information reading apparatus mounted on a moving body for loading a packing box, the information reading apparatus including: a transmitting/receiving unit that generates a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag provided in the packaging box and the contents of the packaging box, and that receives a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the transmission/reception unit.

The wireless tag according to the present invention is a wireless tag provided on a packing box mounted on a mobile body and contents of the packing box, the wireless tag including: a measurement unit that measures an induced electromotive force generated in the wireless tag due to a fluctuation of a magnetic field generated by an information reading device mounted on the mobile body; and a tag-side transmitting unit that transmits a wireless signal including the measured value data of the induced electromotive force measured by the measuring unit.

The information reading system of the present invention includes: an information reading device mounted on a moving body for loading the packaging box; and a wireless tag provided on the package and the contents of the package, the information reading apparatus having: a first transmitting/receiving unit that generates a fluctuation of a magnetic field so as to generate an induced electromotive force for the wireless tag and that receives a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the first transmitting/receiving unit, the wireless tag including: a measurement unit that measures the induced electromotive force; and a tag-side transmitting unit that transmits the wireless signal including the measured value data of the induced electromotive force measured by the measuring unit to the information reading device.

An information reading method according to the present invention is an information reading method to be mounted on an information reading apparatus mounted on a mobile body for loading a packaging box, the information reading method including: a transmitting/receiving step of generating a fluctuation of a magnetic field so as to generate an induced electromotive force on a wireless tag provided in the packaging box and the contents of the packaging box, and receiving a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and a determination step of determining a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received in the transmission/reception step.

The information reading program of the present invention causes a computer to execute the steps of: a transmitting/receiving step of generating a fluctuation of a magnetic field so as to generate an induced electromotive force on a wireless tag provided on the packaging box and the contents of the packaging box mounted on the mobile body, and receiving a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and a determination step of determining a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received in the transmission/reception step.

According to the present invention, the deviation of the package and the deviation of the contents of the package can be discriminated.

Drawings

Fig. 1 is a block diagram showing the configuration of an information reading system according to an embodiment of the present invention.

Fig. 2 is a schematic diagram showing a state in which magnetic field fluctuation occurs in the information reading apparatus according to the embodiment of the present invention.

Fig. 3 is a schematic diagram showing a state in which a wireless tag according to an embodiment of the present invention transmits a wireless signal.

Fig. 4 is a block diagram showing the configuration of an information reading apparatus according to an embodiment of the present invention.

Fig. 5 is a block diagram showing the configuration of a wireless tag according to an embodiment of the present invention.

Fig. 6 is a flowchart showing the operation of the first half of the information reading apparatus according to the embodiment of the present invention.

Fig. 7 is a flowchart showing the operation of the second half of the information reading apparatus according to the embodiment of the present invention.

Fig. 8 is a flowchart showing the operation of the wireless tag according to the embodiment of the present invention.

Fig. 9 is a view showing positional information of a packing box viewed from above a moving body according to an embodiment of the present invention.

Fig. 10 is a view showing positional information of a packing box viewed from the side of a mobile body according to an embodiment of the present invention.

Fig. 11 is a diagram showing an example of a table stored in the storage unit of the information reading apparatus according to the embodiment of the present invention.

Fig. 12 is a sequence diagram of an information reading system according to an embodiment of the present invention.

Detailed Description

An information reading device, a wireless tag, an information reading system, an information reading method, and an information reading program according to exemplary embodiments of the present invention are described below with reference to the drawings. The scope of the present invention is not limited to the following embodiments, and may be arbitrarily changed within the scope of the technical idea of the present invention. In the drawings, in order to facilitate understanding of the structure, the scale, the number, and the like in each structure may be different from those in the actual structure.

Structure of information providing System

The structure of the information reading system 1 according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 3. For convenience of explanation, fig. 3 shows a case where only one packing box 101 is mounted on the mobile body 100. In the present embodiment, a plurality of packing boxes 101 are mounted on a mobile body 100, and wireless tags 3 (3 a, 3 b) are attached to the respective packing boxes 101.

The information reading system 1 includes an information reading device 2, wireless tags 3 (3 a, 3 b), and a writer 4, and transmits and receives data by RFID (radio frequency identification: radio frequency identification), for example.

The information reading apparatus 2 is mounted on the mobile body 100 and is disposed below the package 101. As shown in fig. 2, when the package 101 is stacked in the vertical direction and formed into 3 buildings, 3 information reading devices 2 are provided below the 3 buildings. The moving body 100 is, for example, an automatic transport vehicle (AGV) that performs autonomous traveling, a guided robot, or the like. The information reading apparatus 2 generates a fluctuation B1 of the magnetic field and receives the wireless signal B2 from the wireless tag 3a and the wireless tag 3B.

The wireless tag 3a is attached to each package 101 mounted on the mobile unit 100. The wireless tag 3a transmits a wireless signal B2 (not shown in fig. 3) to the information reading apparatus 2.

The wireless tag 3b is attached to the contents 102 of each package 101. The wireless tag 3B transmits the wireless signal B2 to the information reading apparatus 2.

The wireless tag 3a attached to the package 101 and the wireless tag 3b attached to the content 102 of the package 101 are disposed in close proximity so that no difference occurs in the influence of the magnetic field from the information reading device 2.

The writer 4 writes predetermined data to the wireless tag 3a and the wireless tag 3b. The predetermined data is ID, standby time information, property information, and location data. The ID is identification information for identifying the wireless tag 3a and the wireless tag 3b, respectively. The standby time information is information of a standby time (millisecond) until the wireless tag 3a and the wireless tag 3B start transmitting the wireless signal B2 to the information reading apparatus 2, respectively. The property information is information on whether the package 101 or the content 102 is provided. The position data is information indicating the relative position in the mobile body 100. The details of the position data will be described later.

Structure of information reading device

The structure of the information reading apparatus 2 according to the embodiment of the present invention will be described in detail with reference to fig. 4.

The information reading apparatus 2 includes a power supply unit 21, a magnetic field control unit 22, a transmitting/receiving unit 23, a demodulation unit 24, a decoding unit 25, a determination unit 26, a storage unit 27, a display unit 28, and a prediction unit 29.

The power supply unit 21 supplies electric power to the magnetic field control unit 22.

The magnetic field control unit 22 receives the power from the power supply unit 21 in accordance with the control of the determination unit 26, generates a magnetic field from the transceiver unit 23, and controls the intensity of the generated magnetic field.

The transmitting/receiving unit 23 is a loop antenna that generates a magnetic field and generates a fluctuation of the magnetic field by passing a current under the control of the magnetic field control unit 22. The transceiver 23 receives the radio signals from the radio tag 3a and the radio tag 3b and outputs the radio signals to the demodulator 24.

The demodulation unit 24 demodulates the radio signal input from the transmission/reception unit 23, and outputs the demodulated signal to the decoding unit 25. The radio signal demodulated by the demodulation unit 24 is preferably modulated by an ASK modulation (amplitude shift modulation) method in which the amplitude of the carrier wave is changed.

The decoding unit 25 decodes the demodulation signal input from the demodulation unit 24, extracts the measurement value data included in the demodulation signal and the IDs identifying the wireless tag 3a and the wireless tag 3b, and outputs the extracted measurement value data and IDs to the determination unit 26.

The determination Unit 26 is configured by, for example, 1 or more CPUs (Central Processing Unit: central Processing units) or MPUs (Micro-Processing units). The determination unit 26 stores the measured value data input from the decoding unit 25 in the storage unit 27 in association with the ID. The determination unit 26 predicts the time when each of the wireless tag 3a and the wireless tag 3b starts transmitting the wireless signal, based on the time when the magnetic field fluctuation occurs in the transmitting/receiving unit 23. The determination unit 26 determines the deviation of the package 101 and the deviation of the content 102 based on the measured value data and the ID input from the decoding unit 25 and the measured value data and the ID stored in the storage unit 27, and controls the display unit 28 to display the determination result.

The storage unit 27 stores the measured value data in association with the ID.

The display unit 28 is constituted by a liquid crystal display or the like. The display unit 28 displays the determination result of the deviation of the package 101 and the deviation of the content 102 by the control of the determination unit 26. The display unit 28 may function as an operation panel (or may function as a user interface operated by a user).

The predicting unit 29 predicts the time when each of the wireless tag 3a and the wireless tag 3b starts transmitting the wireless signal, based on the time when the transmitting/receiving unit 23 generates the magnetic field fluctuation. The prediction unit 29 controls the transmission/reception unit 23 such that the transmission/reception unit 23 starts the reception of the wireless signal in accordance with the predicted time to start the transmission of the wireless signal.

Structure of Wireless Label

The structures of the wireless tag 3a and the wireless tag 3b according to the embodiment of the present invention will be described in detail with reference to fig. 5. Since the wireless tag 3a and the wireless tag 3b have the same configuration, the wireless tag 3a and the wireless tag 3b are collectively referred to as a wireless tag 3 as needed in the following description.

The wireless tag 3 includes an IC chip 30 and a transceiver 31.

The IC chip 30 is hardware for controlling measurement of induced electromotive force caused by magnetic field fluctuation generated by the information reading device 2 and data transmission from the wireless tag 3 to the information reading device 2, and includes a measurement unit 32, a control unit 35, a storage unit 36, an encoding unit 37, and a modulation unit 38.

The measuring unit 32 measures the induced electromotive force generated by the information reading device 2 in the transmitting/receiving unit 31 having a loop antenna, and outputs measured value data of the measured induced electromotive force to the control unit 35.

The control section 35 is constituted by one or more CPUs or MPUs. The control unit 35 writes predetermined data input from the transmitting/receiving unit 31 into the storage unit 36 before the moving body 100 starts moving. The control unit 35 stores the measured value data input from the measuring unit 32 in the storage unit 36, and outputs the measured value data stored in the storage unit 36 and the ID stored in the storage unit 36 to the encoding unit 37. The control unit 35 controls the transmission timing of the radio signal transmitted by the transmitting/receiving unit 31 based on the transmission timing information stored in the storage unit 36.

The storage unit 36 stores predetermined data written by the control unit 35.

The encoding unit 37 encodes the measured value data and the ID input from the control unit 35, and outputs the encoded signal to the modulation unit 38.

The modulation unit 38 modulates the coded signal input from the coding unit 37, and outputs the modulated signal to the transmitting/receiving unit 31. The modulation unit 38 preferably modulates the coded signal by an ASK modulation scheme.

The transmitting/receiving unit 31 receives predetermined data transmitted from the writer 4, and outputs the received data to the control unit 35. The transmitting/receiving unit 31 is a loop antenna for transmitting the radio signal generated by the transmitting/receiving unit 23 of the information reading apparatus 2. The transceiver 31 converts the modulated signal input from the modulator 38 into a wireless signal, and transmits the converted wireless signal to the tag-side transmitter of the information reader 2 when a predetermined standby time elapses under the control of the controller 35.

Operation of information reading device

The operation of the information reading apparatus 2 according to the embodiment of the present invention will be described in detail with reference to fig. 6 and 7.

Before starting the operation, the information reading apparatus 2 stores the table shown in fig. 11 in the storage unit 27. The table shown in fig. 11 is a table in which ID, property, position data, and allowable error v_th [ V ] of induced electromotive force are associated.

First, the determination unit 26 determines whether or not the package 101 is in the reload mode in which the package is reloaded to the mobile unit 100 (S1). The reload mode is a mode in which the transceiver 23 does not generate a change in magnetic field and the determination unit 26 does not determine the displacement of the package 101 and the content 102, and can be set by operating an operation panel or the like displayed on the display unit 28.

In the reload mode (yes in step S1), the determination unit 26 repeats the processing in step S1.

On the other hand, when the reload mode is not established (step S1: no), the determination unit 26 controls the magnetic field control unit 22 to cause the transmitter/receiver unit 23 to generate a magnetic field after the mobile unit 100 is able to convey the package 101 and immediately before the mobile unit 100 starts to move (S2).

Next, the transceiver 23 receives a radio signal including the ID and the measured value data from each radio tag 3 (S3).

Next, the determination unit 26 stores the ID and measured value data obtained by demodulating the radio signal by the demodulation unit 24 and decoding by the decoding unit 25 in the storage unit 27 (S4). In this case, the demodulation unit 24 can demodulate the ASK-modulated radio signal, so that the power is not interrupted by the demodulation during the communication between the information reading apparatus 2 and the radio tag 3, and the operation of the radio tag 3 that operates by the power supply from the information reading apparatus 2 can be stopped. The measured value data stored in the storage unit 27 in step S4 is a reference value to be compared with measured value data acquired later.

Next, the determination unit 26 determines whether or not the wireless tag 3 that has not received the wireless signal remains (S5).

If the wireless tag 3 that has not received the wireless signal remains (yes in step S5), the determination unit 26 returns to the process in step S2.

On the other hand, when the wireless tag 3 that has not received the wireless signal remains (step S5: no), the determination unit 26 controls the magnetic field control unit 22 to cause the transmitting/receiving unit 23 to generate a magnetic field during the traveling of the mobile unit 100 (S6).

Next, the transceiver 23 receives a radio signal including the ID and the measured value data from each radio tag 3 (S7).

Next, the determination unit 26 stores the ID and measured value data included in the wireless signal in the storage unit 27 (S8).

Next, the determination unit 26 compares the measured value data vbox_first of the mobile object 100 stored in the storage unit 27 immediately before departure in step S4 with the measured value data vbox_now acquired in the storage unit 27 (S9). By comparing the measurement value data vbox_now obtained this time with the measurement value data vbox_first immediately before the mobile object 100 gets out of the vehicle, it is possible to accurately determine the displacement of the package 101 and the displacement of the content 102.

Next, the determination unit 26 determines whether or not the wireless tag 3 that has not received the wireless signal remains (S10).

If the wireless tag 3 that has not received the wireless signal remains (yes in step S10), the determination unit 26 returns to the process in step S6.

On the other hand, when no wireless tag 3 that has not received a wireless signal remains (step S10: NO), the determination unit 26 collects an ID that changes in the measured value data (S11). Specifically, the determination unit 26 collects IDs at which the difference between the measured value data vbox_first and the measured value data vbox_now is equal to or greater than a predetermined value.

Next, the determination unit 26 determines whether or not there are 1 or more IDs collected (S12).

When the collected ID is 0 (no in step S12), the determination unit 26 returns to the operation in step S1.

On the other hand, when the number of collected IDs is 1 or more (yes in step S12), the determination unit 26 classifies the collected IDs into the IDs of the wireless tag 3a of the package 101 and the IDs of the wireless tag 3b of the content 102 (S13).

Next, the determination unit 26 checks each element (property, position data, allowable error of induced electromotive force) with respect to the wireless tag 3b classified into the IDs of the wireless tags 3b of the contents 102 based on the table shown in fig. 11 stored in the storage unit 27 (S14).

Next, the determination unit 26 determines whether or not the ID of the wireless tag 3a of the package 101 having the same position data as the position data of the wireless tag 3b of the content 102 is stored in the storage unit 27 (S15).

Here, the positions of the package 101 and the contents 102 will be described in detail with reference to fig. 9 and 10. As shown in fig. 9 and 10, an origin in the mobile body 100 is determined, and positions of the package 101 and the contents 102 are defined from the determined origin in a cartesian coordinate system of x-axis, y-axis, and z-axis.

In the present embodiment, the position coordinates (x, y, z) of the package 101 and its contents 102 closest to the origin are set to (1, 1). The position coordinates of one package 101 and its contents 102 adjacent to the package 101 and its contents 102 having the position coordinates (1, 1) in the x-axis direction are (2, 1), and the position coordinates of the next adjacent package 101 and its contents 102 in the x-axis direction are (3, 1).

In addition, the position coordinates of one package 101 and its contents 102 adjacent to the package 101 and its contents 102 having the position coordinates (1, 1) in the y-axis direction are (1, 2, 1), and the position coordinates of the next adjacent package 101 and its contents 102 in the y-axis direction are (1, 3, 1).

The position coordinates of one package 101 and its contents 102 adjacent to the package 101 and its contents 102 having the position coordinates (1, 1) in the z-axis direction are (1, 2), and the position coordinates of the next adjacent package 101 and its contents 102 in the z-axis direction are (1, 3).

Here, in the table shown in fig. 11, since the position data of the wireless tag 3a with the ID "1" and the position data of the wireless tag 3b with the ID "2" are the same (1, 1), it is shown that the content 102 with the wireless tag 3b with the ID "2" attached is put into the package box 101 with the wireless tag 3a with the ID "1" attached. In the table shown in fig. 11, the position data (1, 2) of the wireless tag 3a having the ID "3" is higher by 1 in the z-axis direction than the position data (1, 1) of the wireless tag 3a having the ID "1", and therefore, it is shown that the package 101 to which the wireless tag 3a having the ID "3" is attached is stacked on the package 101 to which the wireless tag 3a having the ID "1" is attached.

The position data included in the wireless signal received by the information reading apparatus 2 is the data of the position coordinates.

When the ID of the wireless tag 3a of the package 101 having the same position data as the position data of the wireless tag 3b of the content 102 is stored in the storage unit 27 (yes in step S15), the determination unit 26 determines that the package 101 is in a moving state (S16).

Next, the determination unit 26 calculates an absolute value Δv_box= |vbox_non-vbox_first| of a difference between the measurement value data vbox_first immediately before the moving object 100 moves and the measurement value data vbox_now for the package box 101. The determination unit 26 calculates an absolute value Δv_inside= |vinside_non-vinside_first| of a difference between the measured value data vinside_first immediately before the departure of the mobile body 100 and the measured value data vinside_now with respect to the content 102. Then, the determination unit 26 calculates a difference |Δv_box- Δv_inside| between the absolute value of the difference value obtained for the package 101 and the absolute value of the difference value obtained for the content 102.

Then, the determination unit 26 selects, as a threshold value, the allowable error v_th of the induced electromotive force corresponding to the collected ID in the table shown in fig. 11 stored in the storage unit 27, and determines whether the obtained difference |Δv_box- Δv_inside| is lower than the allowable error v_th of the selected induced electromotive force (S17).

For example, when the collected ID is "1", the determination unit 26 determines whether the obtained difference |Δv_box—Δv_inside| is lower than 1[V because the allowable error v_th of the induced electromotive force corresponding to the collected ID of "1" is 1[V in the table shown in fig. 11. Alternatively, in the case where the collected ID is "3", since the allowable error v_th of the induced electromotive force corresponding to the collected ID "3" is 0.7[ V ], the determination unit 26 determines whether the obtained difference |Δv_box- Δv_inside| is lower than 0.7[ V ]. In this way, by making the allowable error v_th of the induced electromotive force of the wireless tag 3 closer to the information reading device 2 larger, erroneous determination by the determination unit 26 can be prevented.

When the difference |Δv_box- Δv_inside| is smaller than the threshold value v_th (yes in step S17), the determination unit 26 determines that the package 101 and the content 102 thereof move in the same direction at the same time, and determines that there is no problem in packaging the content 102, but that there is a problem in fixing the outside of the package 101 (S18).

Next, the determination unit 26 displays the position of the position data corresponding to the ID of the wireless tag 3a of the packaging box 101 determined to be problematic in the table shown in fig. 11 stored in the storage unit 27 on an external display device, not shown, and notifies the user such as the conveyor (S19), and returns to the operation of step S1. This allows the user to specify the position of the package 101 determined to be in question, and to fix the specified position outside the package 101 again.

On the other hand, when the ID of the wireless tag 3a of the package 101 having the same position data as the position data of the wireless tag 3b of the content 102 is not stored in the storage unit 27 in step S15 (step S15: no), the determination unit 26 determines that there is a problem with the internal package of the content 102 (S20), and the process of step S19 is performed.

When the difference |Δv_box- Δv_inside| is equal to or greater than the threshold value v_th in step S17 (step S17: no), the determination unit 26 determines that the package 101 and the content 102 thereof move in a scattered manner, and determines that both the package 101 is fixed and the content 102 thereof is internally packaged (S21), and performs the operation of step S19.

< action of Wireless tag >)

The operation of the wireless tag 3 according to the embodiment of the present invention will be described in detail with reference to fig. 8.

First, the control unit 35 determines whether or not the transmission/reception unit 31 detects the induced electromotive force generated by the information reading device 2 (S31).

When the induced electromotive force is not detected (no in step S31), the control unit 35 repeats the processing in step S31.

On the other hand, when the induced electromotive force is detected (yes in step S31), the control unit 35 generates a coded signal obtained by coding the measured value data of the induced electromotive force measured by the measuring unit 32 and the ID stored in the storage unit 36 in the coding unit 37 (S32), and modulates the generated coded signal in the modulating unit 38 to generate a modulated signal.

Next, the control unit 35 refers to the transmission timing information (standby time) stored in the storage unit 36 (S33).

Next, the control unit 35 determines whether or not the standby time has elapsed (S34).

When the standby time has not elapsed (step S34: no), the control unit 35 repeats the processing of step S34.

On the other hand, when the standby time has elapsed (yes in step S34), the control unit 35 transmits a wireless signal including the measured value data and the ID to the information reading device 2 via the transmitting/receiving unit 31 (S35), and returns to the process in step S31.

< action of information reading System >)

The operation of the information reading system 1 according to the embodiment of the present invention will be described in detail with reference to fig. 12. In fig. 12, a case where the information reading apparatus 2 communicates with 3 wireless tags 3 will be described. The 3 wireless tags 3 are, for example, wireless tags 3a mounted on 3 packaging boxes 101 stacked in the vertical direction in fig. 2 (or wireless tags 3b mounted on the contents). In addition, without being limited thereto, the information reading apparatus 2 may communicate with a predetermined number of wireless tags 3.

At time t1, the information reading apparatus 2 causes the wireless tag 3-1 to the wireless tag 3-3 to generate an induced electromotive force (S41).

The wireless tags 3-1 to 3-3 measure the induced electromotive force in a time from the time t1 to the time t 2.

The wireless tag 3-1 transmits a wireless signal including the measured value data and the ID to the information reading device 2 at time t3 after the standby time of the standby time information stored in the storage unit 36 has elapsed from time t2 (S42).

The wireless tag 3-2 transmits a wireless signal including the measured value data and the ID to the information reading device 2 at time t4 after the standby time of the standby time information stored in the storage unit 36 has elapsed from time t2 (S43).

The wireless tag 3-3 transmits a wireless signal including the measured value data and the ID to the information reading device 2 at time t5 after the lapse of the standby time information stored in the storage unit 36 from time t2 (S44).

The information reading apparatus 2 can prevent overlapping of magnetic fields transmitted from the respective wireless tags 3-1 to 3-3 by making transmission timings of wireless signals transmitted to the information reading apparatus 2 different for each of the wireless tags 3-1 to 3-3.

The information reading apparatus 2 performs reception bias determination for determining the radio signal received in the time from time t3 to time t4 as the radio signal of the radio tag 3-1, performs reception bias determination for determining the radio signal received in the time from time t4 to time t5 as the radio signal of the radio tag 3-2, and performs reception bias determination for determining the radio signal received in the time from time t5 to time t6 as the radio signal of the radio tag 3-3. The reception deviation determination of the wireless tag 3-1 is that the reception determination of the wireless tag 3-1 is deviated from the timing of the reception determinations of the wireless tag 3-2 and the wireless tag 3-3.

In the above-described operation of the information reading apparatus 2, the determination unit 26 predicts the times t3, t4, and t5 at which the wireless tags 3-1 to 3-3 start transmission of the wireless signal, respectively, based on the time t1 at which the transmission/reception unit 23 generates the magnetic field fluctuation, and controls the magnetic field control unit 22 so that the transmission/reception unit 23 starts reception of the wireless signal in accordance with the predicted times at which the transmission of the wireless signal starts. This reduces the power consumption required for waiting for the reception of the wireless signal.

As described above, according to the present embodiment, by including the transmitting/receiving unit 23 and the determining unit 26, it is possible to determine the deviation of the package 101 and the deviation of the content 102, in which the transmitting/receiving unit 23 generates a fluctuation of the magnetic field so that the wireless tag 3 provided to the package 101 and the content 102 generates an induced electromotive force, and receives a wireless signal including measurement value data of the induced electromotive force of the wireless tag 3 transmitted from the wireless tag 3, and the determining unit 26 determines the deviation of the package 101 and the deviation of the content 102 based on the measurement value data included in the wireless signal received by the transmitting/receiving unit 23.

In the present embodiment, the mobile body 100 is not limited to an automatic transport vehicle (AGV) or a guided robot that performs autonomous travel, and may be an automatic transport vehicle or a person-carrying transport vehicle that does not perform autonomous travel.

The program for realizing the functions of the information reading apparatus 2 according to the above embodiment may be recorded on a computer-readable recording medium, and the processing may be performed by causing a computer system to read and execute the program recorded on the recording medium.

The above embodiments are examples in all respects and should not be considered as limiting. The scope of the present invention is not shown by the above embodiments, but by the scope of patent protection, and includes meanings equivalent to the scope of patent protection and all modifications within the scope.

In addition, the present technology may employ the following structure.

(1) An information reading apparatus mounted on a moving body on which a package is mounted, the information reading apparatus comprising: a transmitting/receiving unit that generates a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag provided in the packaging box and the contents of the packaging box, and that receives a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the transmission/reception unit.

(2) The information reading apparatus according to (1), the information reading apparatus having: and a storage unit that stores identification information for identifying the wireless tag in association with position data indicating a relative position between the packaging box and the content on the mobile unit, wherein the transmitting/receiving unit receives the wireless signal including the measurement value data and the identification information transmitted from the wireless tag, and the determination unit determines a deviation of the packaging box and a deviation of the content based on the position data corresponding to the identification information included in the wireless signal received by the transmitting/receiving unit in the storage unit and the measurement value data included in the wireless signal received by the transmitting/receiving unit.

(3) The information reading apparatus according to (2), wherein the determination unit determines that the package is shifted when the same position data is included in the position data of the wireless tag in which a difference between the measured value data of the wireless tags included in the wireless signals received by the transmitting/receiving unit is equal to or greater than a predetermined value, and determines that the content is shifted when the same position data is not included.

(4) The information reading apparatus according to any one of (1) to (3), the information reading apparatus having: and a prediction unit configured to predict a time when the wireless tag starts transmitting the wireless signal, based on a time when the transmission/reception unit generates the magnetic field fluctuation, and the transmission/reception unit starts receiving the wireless signal in accordance with the time when the transmission/reception unit starts the transmission.

(5) The information reading apparatus according to any one of (1) to (4), wherein the transmitting/receiving unit is configured to generate a fluctuation of the magnetic field after the packaging box is transported by the movable body and before the movable body starts moving, and to generate a fluctuation of the magnetic field every predetermined period when the movable body is traveling.

(6) The information reading apparatus according to any one of (1) to (5), wherein the determination unit compares the measured value data before the transmission of the mobile body included in the wireless signal received by the transmission/reception unit with the measured value data during the traveling of the mobile body, and determines the deviation of the package and the deviation of the content.

(7) The information reading apparatus according to any one of (1) to (6), wherein the determination unit determines the deviation of the package and the deviation of the content based on a change in the measured value data of the wireless tag provided on the package and a change in the measured value data of the wireless tag provided on the content included in the wireless signal received by the transmitting/receiving unit.

(8) The information reading apparatus according to any one of (1) to (7), wherein the determination unit compares a difference between the measured value data of each of the wireless tags included in the wireless signals received by the transmitting/receiving unit and a threshold value to determine a deviation of the package and a deviation of the content, and the threshold value compared with the difference of the wireless tag at a greater distance is smaller.

(9) A wireless tag provided on a packing box loaded on a mobile body and contents of the packing box, the wireless tag comprising: a measurement unit that measures an induced electromotive force generated in the wireless tag due to a fluctuation of a magnetic field generated by an information reading device mounted on the mobile body; and a tag-side transmitting unit that transmits a wireless signal including the measured value data of the induced electromotive force measured by the measuring unit.

(10) The wireless tag according to (9), wherein the tag-side transmitting unit transmits the wireless signal to the information reading device at a transmission timing different for each wireless tag.

(11) An information reading system, comprising: an information reading device mounted on a moving body on which the package is mounted; and a wireless tag provided on the package and the contents of the package, the information reading apparatus having: a transmitting/receiving unit that generates a fluctuation of a magnetic field, generates an induced electromotive force in a wireless tag, and receives a wireless signal including measurement value data of the induced electromotive force of the wireless tag transmitted from the wireless tag; and a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the transmission/reception unit, the wireless tag including: a measurement unit that measures the induced electromotive force; and a tag-side transmitting unit that transmits a wireless signal including the measured value data of the induced electromotive force measured by the measuring unit.

(12) An information reading method of an information reading apparatus mounted on a moving body on which a package is loaded, the information reading method comprising the steps of: a transmitting/receiving step of generating a wireless signal including data of measured values of the induced electromotive force of the wireless tag transmitted from the wireless tag while generating the induced electromotive force by a wireless tag provided in the packaging box and the contents of the packaging box; and a determination step of determining a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received in the transmission/reception step.

(13) An information reading program for causing a computer to execute the steps of: a transmitting/receiving step of generating a wireless signal including measurement value data of the induced electromotive force of the wireless tag transmitted from the wireless tag, the wireless tag being provided on the mobile body and the packaging box and the wireless tag being provided on the mobile body, the wireless tag being configured to generate the induced electromotive force by a fluctuation of a magnetic field; and a determination step of determining a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received in the transmission/reception step.

Description of the reference numerals

1 information reading system

2 information reading device

3 Wireless tag

4 writer

21 power supply unit

22 magnetic field control part

23 transceiver

24 demodulation unit

25 decoding section

26 determination part

27 storage part

28 display unit

29 prediction unit

30IC chip

31 transceiver

32 measuring unit

33 demodulation unit

34 transceiver

35 control part

36 storage part

37 coding part

38 modulation unit

100 moving body

101 packing case

102 the contents.

Claims (13)

1. An information reading apparatus mounted on a moving body on which a package is mounted, characterized in that,

the information reading device includes:

a transmitting/receiving unit that generates a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag provided in the packaging box and the contents of the packaging box, and that receives a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and

and a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the transmission/reception unit.

2. The information reading apparatus according to claim 1, wherein,

the information reading device includes a storage unit for storing identification information for identifying the wireless tag in association with position data indicating relative positions of the packaging box and the contents on the mobile body,

the transceiver unit receives the wireless signal including the measurement value data and the identification information transmitted from the wireless tag,

the determination unit determines the deviation of the package and the deviation of the content based on the position data corresponding to the identification information included in the wireless signal received by the transmission/reception unit and the measured value data included in the wireless signal received by the transmission/reception unit in the storage unit.

3. An information reading apparatus according to claim 2, wherein,

the determination unit determines that the package is shifted when the same position data exists among the position data of the wireless tags whose difference between the measured value data of each of the wireless tags included in the wireless signals received by the transmission/reception unit is equal to or greater than a predetermined value, and determines that the content is shifted when the same position data does not exist.

4. An information reading apparatus according to any one of claims 1 to 3, wherein,

the information reading device includes a predicting unit for predicting a time when the wireless tag starts to transmit the wireless signal, respectively, based on a time when the transmitting/receiving unit generates a magnetic field fluctuation,

the transmitting/receiving unit starts the reception of the radio signal in accordance with the time at which the transmission is started, which is predicted by the predicting unit.

5. An information reading apparatus according to any one of claims 1 to 3, wherein,

the transmitting/receiving unit generates a fluctuation of the magnetic field after the packaging box can be transported by the moving body and before the moving body starts moving, and generates a fluctuation of the magnetic field every predetermined period when the moving body is traveling.

6. An information reading apparatus according to any one of claims 1 to 3, wherein,

the determination unit compares the measured value data of the mobile body before the hair of the mobile body, which is included in the wireless signal received by the transmission/reception unit, with the measured value data of the mobile body during traveling, and determines the deviation of the package and the deviation of the content.

7. An information reading apparatus according to any one of claims 1 to 3, wherein,

the determination unit determines the deviation of the package and the deviation of the content based on the change in the measured value data of the wireless tag provided on the package and the change in the measured value data of the wireless tag provided on the content, which are included in the wireless signal received by the transmission/reception unit.

8. An information reading apparatus according to any one of claims 1 to 3, wherein,

the determination unit compares a difference between the measured value data of each of the wireless tags included in the wireless signal received by the transmission/reception unit with a threshold value, and determines a deviation of the package and a deviation of the content, and the smaller the threshold value is compared with the difference between the wireless tags that are farther from each other.

9. A wireless tag provided on a package mounted on a mobile body and contents of the package, characterized in that,

the wireless tag has:

a measurement unit that measures an induced electromotive force generated in the wireless tag due to a fluctuation of a magnetic field generated by an information reading device mounted on the mobile body; and

and a tag-side transmitting unit that transmits a wireless signal including the measurement value data of the induced electromotive force measured by the measuring unit.

10. The wireless tag of claim 9, wherein the wireless tag,

the tag-side transmitting unit transmits the wireless signal to the information reading device at a timing different for each wireless tag.

11. An information reading system, comprising: an information reading device mounted on a mobile body for loading a package, and a wireless tag provided on the package and contents of the package,

it is characterized in that the method comprises the steps of,

the information reading device includes:

a transmitting/receiving unit that generates a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag and that receives a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and

a determination unit configured to determine a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received by the transmission/reception unit,

the wireless tag has:

a measurement unit that measures the induced electromotive force; and

and a tag-side transmitting unit that transmits the wireless signal including the measured value data of the induced electromotive force measured by the measuring unit to the information reading device.

12. An information reading method of an information reading apparatus mounted on a moving body for loading a packing box, characterized in that,

the information reading method includes:

a transmitting/receiving step of generating a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag provided in the packaging box and the contents of the packaging box, and receiving a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and

and a determination step of determining a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received in the transmission/reception step.

13. A computer-readable recording medium storing an information reading program, characterized in that,

the information reading program causes a computer to execute the steps of:

a transmitting/receiving step of generating a fluctuation of a magnetic field so as to generate an induced electromotive force in a wireless tag provided on the packaging box and the contents of the packaging box mounted on a mobile body, and receiving a wireless signal including measurement value data of the induced electromotive force in the wireless tag transmitted from the wireless tag; and

and a determination step of determining a deviation of the package and a deviation of the content based on the measured value data included in the wireless signal received in the transmission/reception step.