JP2011011841A - Inspection method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inspection method for improving the rate of reading radio IC tags while preventing the leakage of electric waves without providing special installations and increasing workloads on workers.SOLUTION: The inspection method includes detecting the existence or not of articles coming near the entrance of a gate, opening the entrance door of the gate when detecting the existence of the articles coming near the entrance of the gate, detecting whether all of the articles enter into the gate or not, closing the entrance door when detecting that all of the articles enter into the gate, transmitting electric waves from an antenna installed in the gate toward the articles after fully closing the entrance door, reading management information registered on the radio IC tags while using the antenna for receiving the electric waves transmitted from the radio IC tags pasted to inspected objects out of the articles, and stopping the transmission of the electric waves after predetermined conditions are established.

Description

 The present invention relates to an inspection method.

  When shipping electronic parts such as electronic boards produced at factories and other articles, inspection is generally performed to inspect the type and quantity of the goods to be shipped. Conventionally, inspection is performed by attaching a barcode that records the type and quantity of an article to a bucket that stores the article, and an operator reads the barcode attached to each bucket one by one using a portable barcode reader. I was working. However, this method has a problem that when the production amount of articles increases and the number of buckets increases, the burden on the worker who reads the barcode increases, and the frequency of work mistakes increases.

  In response to this problem, an inspection gate system using RFID technology that uses radio waves in the UHF band of 952 MHz to 954 MHz (according to the Domestic Radio Law) with a communication distance of about several meters has been introduced. In this inspection gate system, a gate equipped with a transceiver capable of wireless communication with a wireless IC tag is installed at an entry / exit location of an article, and a bucket with a wireless IC tag that records the type and quantity of the article is attached to a hand lift or This is a system in which inspection is performed by automatically reading the record information of the wireless IC tag attached to each bucket when it is placed on a cart or the like and passes through the gate. As a result, the efficiency of inspection work can be greatly improved.

  However, in such an inspection gate system, when conductive articles such as electronic boards are stored in the bucket, these articles reflect radio waves transmitted from the transmitter / receiver of the gate. When many are stacked, it is difficult for radio waves to reach the inside, and the reading rate of the wireless IC tag is deteriorated. In order to solve this problem, for example, in Patent Document 1 below, a radio IC tag to be inspected is transmitted through a radio wave directing unit composed of a plurality of reflectors by transmitting a radio wave transmitted from a transceiver provided in a gate. A technique for irradiating a laser beam is disclosed.

JP 2007-88518 A

 However, in the technique of Patent Document 1, the outer shape becomes larger as the number of buckets to be inspected at a time increases, so that it is difficult to cover the entire surrounding area as a communication area, and it is easy to generate a place where radio waves do not hit. Reading rate may be reduced.

 Further, generally, a shipping preparation completion place is provided on the entrance side of the gate at the delivery location, and a large number of buckets that have been prepared for shipment are stacked. If the shipping preparation area is small and there is not enough room, buckets may be stacked on the exit side of the gate. In such a case, with the technique disclosed in Patent Document 1, there is a possibility that the wireless IC tag of the bucket placed around the outside of the gate may also be read. In other words, since radio waves in the UHF band reach far away, the reflected waves reflected by the workers themselves or conductive articles in the bucket piled up in the gate for inspection, or the direct waves from the transceiver There is a possibility of leaking to the outside of the gate and reading the wireless IC tag of the bucket that is piled up far away by reflection and diffraction.

 In order to prevent unnecessary reading due to leaked radio waves from the gate, a method of reducing the output of the radio wave can be considered, but the reading rate of the wireless IC tag attached to the bucket in the gate to be originally read decreases. there's a possibility that. Although a method of installing a radio wave absorption board between a bucket and a gate that is not the object of inspection is also conceivable, it is not preferable because the amount of work for the worker increases. In addition, by measuring the propagation delay time of the radio wave and estimating the distance to the wireless IC tag, there is also a method for discriminating the bucket to be read (bucket in the gate) and the other bucket (bucket outside the gate). Although it is conceivable, it is necessary to install a module for measuring the propagation delay time, resulting in an increase in cost.

   The present invention has been made in view of the above-described circumstances, and prevents leakage of radio waves and improves the reading rate of a wireless IC tag without providing special equipment or increasing the amount of work of an operator. It is an object of the present invention to provide a possible inspection method.

 In order to achieve the above object, an inspection method according to the first aspect of the present invention uses an inspection gate system including a gate having a radio wave shielding function on at least both sides and an entrance door, and the inside of the gate is an inspection object. An inspection method for performing inspection by reading management information from a wireless IC tag affixed to the inspection object when an object passes, and detecting the presence or absence of an object approaching the gate entrance An entrance door opening step of opening the gate entrance door when an object approaching the gate entrance is detected in the object detection step, and whether all of the objects have entered the gate. An intrusion detection step for detecting whether or not, an entrance door closing step for closing the entrance door when the intrusion detection step detects that all of the object has entered the gate, and the entrance door includes: After closing, a radio wave transmitting step of transmitting radio waves from the antenna installed in the gate toward the object, and radio waves transmitted from the wireless IC tag attached to the inspection object included in the object An information reading step of reading management information recorded in the wireless IC tag by receiving with the antenna, and a radio wave stopping step of stopping transmission of the radio wave after the predetermined condition is satisfied, To do.

 Further, the inspection method according to the second aspect of the present invention uses an inspection gate system including a gate having a radio wave shielding function on at least both side surfaces and an exit door, and when an inspection object passes through the gate. An inspection method for performing inspection by reading management information from a wireless IC tag attached to the inspection object, the object detection step for detecting the presence or absence of an object approaching the gate entrance, and the object detection An exit door closing step of closing the exit door of the gate when it is detected that there is an object approaching the entrance of the gate in the step, and the object passes through the entrance of the gate after the exit door is fully closed A radio wave transmitting step of transmitting radio waves from the antenna installed in the gate toward the object, and a wireless IC tag attached to the inspection object included in the object Receiving the received radio wave with the antenna, an information reading step of reading management information recorded in the wireless IC tag, a radio wave stopping step of stopping transmission of the radio wave after the predetermined condition is satisfied, And an exit door opening step of opening the exit door after the transmission of the radio wave is stopped.

In the inspection method according to the first and second aspects, an information display step of displaying management information of the inspection object read in the information reading step on an information processing terminal installed in the gate. And a comparison result display step of comparing the read management information with the management information of the inspection object registered in advance and displaying the comparison result on the information processing terminal. To do.
Furthermore, in the inspection method according to the first and second aspects, the radio wave transmission step transmits the radio wave after a predetermined time has elapsed since the entrance door or the exit door is fully closed. And

 According to the present invention, it is possible to prevent leakage of radio waves and improve the reading rate of a wireless IC tag without providing special equipment or increasing the amount of work of an operator.

1 is a schematic configuration diagram of an inspection gate system 1 according to a first embodiment of the present invention. It is a flowchart showing the inspection method in 1st Embodiment of this invention. It is explanatory drawing of the intrusion detection process (step S3) in this inspection method. It is explanatory drawing of the entrance door closing process (step S4) in this inspection method. It is explanatory drawing of the electromagnetic wave transmission process (step S5, S6) in this inspection method. It is explanatory drawing of the comparison result display process (step S9) in this inspection method. It is a block schematic diagram of the inspection gate system 1A in 2nd Embodiment of this invention. It is a flowchart showing the inspection method in 2nd Embodiment of this invention.

Hereinafter, an embodiment of an inspection method according to the present invention will be described with reference to the drawings.
[First Embodiment]
First, a first embodiment of an inspection method according to the present invention will be described. Before describing the inspection method according to the first embodiment, the configuration of an inspection gate system necessary for realizing the inspection method will be described.

  FIG. 1 is a schematic configuration diagram of an inspection gate system 1 in the first embodiment. In FIG. 1, a gate 2 is a rectangular parallelepiped having a frame structure made of a steel frame, and is installed on a conveyance path of a bucket 20 that houses an article (for example, an electronic component such as an electronic board). Each bucket 20 has a wireless IC tag 30 on which management information is recorded. Here, the management information refers to data in which a bucket number assigned to the bucket 20 and a product number of each article stored in the bucket 20 are linked. Such a bucket 20 is loaded on the handlift 40 and is carried by the hand of the worker 50.

 The entrance door 3 provided at the entrance 2a of the gate 2, the ceiling surface 4, and the left side surface 5 and the right side surface 6 of the gate 2 as viewed from the entrance 2a are formed by a radio wave shielding sheet described later. In addition, a sheet winding machine 7 that winds and unwinds the entrance door 3 is installed at the upper part of the entrance 2a. It has a configuration. The outlet 2b of the gate 2 is not covered with a radio wave shielding sheet or the like and is in an open state.

  The radio wave shielding sheet used for the gate 2 is made of a metal fiber cloth having a mesh structure with a visible light transmittance of 68% using a metal wire having a wire diameter of 27 μm, and the cloth has a thickness of 0.2 mm to 0 mm. .3mm sandwiched between transparent vinyl chloride sheets. The radio wave shielding sheet has a radio wave shielding capability of about 50 dB with respect to the UHF band frequency (953 MHz).

  An infrared sensor 8 having a passage in front of the entrance 2a of the gate 2 as a detection target area is attached to the center of the surface of the sheet winding machine 7. The infrared sensor 8 is connected to the control box 10 via a signal line (not shown), detects infrared rays existing in the detection target area, and sends a signal representing the infrared intensity distribution in the detection target area to the control box 10. Output.

 A photoelectric tube sensor 9 including a light projector 9a and a light receiver 9b, both connected to the control box 10 via a signal line (not shown), is installed at the entrance 2a of the gate 2. The projector 9 a emits a light beam (either laser light or infrared light) according to the control of the control box 10, and the light beam is emitted from the entrance 2 a so that the light beam is emitted in parallel to the width direction of the gate 2. It is installed at the bottom of the left column. The light receiver 9b outputs a signal indicating the light receiving state of the light beam emitted from the light projector 9a to the control box 10, and is placed below the right column of the entrance 2a so that the light receiving surface faces the light projector 9a. is set up.

  The control box 10 controls the opening / closing operation of the entrance door 3 by controlling the winding and unwinding operations by the sheet winding machine 7 based on the output signals of the infrared sensor 8 and the photoelectric tube sensor 9 (light receiver 9b). It is installed outside the gate 2. Specifically, the control box 10 is a person approaching the entrance 2a of the gate 2 based on the output signal of the infrared sensor 8 (in fact, any object having a temperature higher than the surrounding temperature and similar to that of the human body). ) Is detected, the sheet winding machine 7 is instructed to roll up the entrance door 3 (that is, the entrance door 3 is opened).

 Further, the control box 10 changes the light receiving state of the light beam from “no light reception” (a state where the light is blocked by the object) to “light reception” based on the output signal of the phototube sensor 9 (light receiver 9b). In this case, it is detected that all the objects have entered the gate 2, and the sheet winding machine 7 is instructed to unwind the entrance door 3 (that is, the entrance door 3 is closed). Further, the control box 10 is connected to the personal computer 16 through a signal line (not shown), and outputs a signal indicating the open / closed state of the entrance door 3 (hereinafter referred to as an entrance open / closed state signal) to the personal computer 16.

  Two antennas 11 and 12 are installed on the exit 2b side of the ceiling surface 4 of the gate 2 along the width direction. These antennas 11 and 12 are installed on a pipe (not shown) provided on the ceiling surface 4 so that radio waves are irradiated toward the entrance 2a of the gate 2. Similarly, antennas 13 and 14 are attached to the lower part of the left column and the lower part of the right column of the outlet 2b so as to radiate radio waves toward the inlet 2a of the gate 2. These antennas 11, 12, 13 and 14 are connected to a read / dryer 15 through signal lines (not shown), and transmit radio waves corresponding to transmission signals input from the read / dryer 15, while receiving received radio waves ( A reception signal corresponding to the radio wave transmitted from the wireless IC tag 30 attached to the bucket 20 is output to the reader / writer 15.

  The reader / writer 15 is installed on a pipe (not shown) provided on the ceiling surface 4 of the gate 2 and is connected to the personal computer 16 through a signal line (not shown). The reader / writer 15 generates a transmission signal including a read start command by performing encoding, modulation, and frequency conversion to a UHF band of a read start command input from the personal computer 16 to generate each antenna 11, 12, 13, and 14 for output. Further, the reader / writer 15 performs frequency conversion, demodulation, and decoding of the reception signals input from the antennas 11, 12, 13, and 14 to the IF band, thereby managing information included in the reception signals (each bucket). The management information recorded in the wireless IC tag 30 attached to 20 is extracted, and this management information is output to the personal computer 16.

  The personal computer 16 is installed on a pipe (not shown) provided on the inner side of the right side surface 6 of the gate 2, and based on an inlet open / closed state signal input from the control box 10, radio wave transmission start timing and transmission stop Control timing. Specifically, the personal computer 16 uses the inlet / outlet state signal input from the control box 10 to read the reader / writer 15 after a predetermined time (for example, two seconds) after the entrance door 3 is fully closed. The radio wave transmission from each of the antennas 11, 12, 13 and 14 is started by outputting a read start command. Further, the personal computer 16 stops the transmission of radio waves by instructing the reader / writer 15 to end the reading after a predetermined time has elapsed (for example, after 7 seconds have elapsed) from the start of transmission of radio waves (output of a read start command) To do.

In the production line, when the article is stored in the bucket after the article is completed, the wireless IC uses, as management information, data that associates the number assigned to the bucket 20 with the product number of each article stored in the bucket 20. Although the information is recorded on the tag 30 and attached to the bucket 20, the management information for each bucket 20 is registered in the database of the personal computer 16 at the same time.
The personal computer 16 displays the management information of the read bucket 20 on the screen, compares the management information of the read bucket with the management information registered in advance in the database, and displays the comparison result on the screen. It also has a function (details will be described later).

  The above is the description of the configuration of the inspection gate system 1 necessary for realizing the inspection method. Hereinafter, the inspection method using the inspection gate system 1 described above will be described with reference to the flowchart of FIG. To do.

  As shown in FIG. 2, first, in step S1, the presence or absence of an object approaching the entrance 2a of the gate 2 is detected (object detection step). Specifically, as shown in FIG. 1, during the operation of the inspection gate system 1, the infrared sensor 8 sends a signal representing the infrared intensity distribution in the detection target area set in the passage in front of the entrance 2a to the control box 10. The control box 10 determines whether or not there is any object having a temperature similar to that of the human body in the detection target area based on the output signal of the infrared sensor 8. The presence or absence of an object approaching 2a (that is, the worker 50) is detected.

  In this step S1, in the case of “No”, that is, when there is no object approaching the entrance 2a of the gate 2, step S1 is repeated until the worker 50 approaching the entrance 2a of the gate 2 is detected. On the other hand, if “Yes” in step S1, that is, if the presence of an object approaching the entrance 2a of the gate 2 is detected, the entrance door 3 is opened in step S2 (entrance door opening process). Specifically, as shown in FIG. 1, when the control box 10 detects the presence of an object approaching the entrance 2 a of the gate 2 based on the output signal of the infrared sensor 8, the control box 10 To instruct to wind up the entrance door 3. Thereby, the entrance door 3 is wound up and opened by the sheet winder 7.

  Subsequently, in step S3, it is detected whether all of the objects (that is, all of the worker 50, the hand lift 40, and the bucket 20) have entered the gate 2 (intrusion detection step). Specifically, as shown in FIG. 3, the control box 10 indicates that the light receiving state of the light beam is “no light reception” (the light beam is blocked by the object) based on the output signal of the photoelectric tube sensor 9 (light receiver 9 b). Whether or not all of the objects have entered the gate 2 is detected by determining whether or not the state has changed to “with light reception”. That is, while the hand lift 40 loaded with the bucket 30 as the inspection object is being transported from the entrance 2a into the gate 2 by the worker 50, the light beam emitted from the projector 9a is transmitted to the worker 50 and the bucket. However, when the operator 50 and the hand lift 40 all enter the gate 2, the light receiving state is “light receiving”. It will change to “Yes”.

  In the above step S3, in the case of “No”, that is, when the light receiving state of the photoelectric tube sensor 9 remains “no light reception” (the bucket 20 is being transported), the light reception state of the photoelectric tube sensor 9 transitions to “with light reception”. Step S3 is repeated until. On the other hand, if “Yes” in step S3, that is, if all of the object has entered the gate 2, the entrance door 3 is closed in step S4 (entrance door closing step). Specifically, as shown in FIG. 4, the control box 10 changes the light receiving state of the phototube sensor 9 from “no light reception” to “light reception” based on the output signal of the phototube sensor 9 (light receiver 9b). In this case, it is detected that all of the object has entered the gate 2 and instructs the sheet winder 7 to unwind the entrance door 3. Thereby, the entrance door 3 is unwound by the sheet winder 7 and closed.

Subsequently, in step S5, it is determined whether or not a predetermined time (for example, 2 seconds) has elapsed since the entrance door 3 is fully closed. If “Yes”, the installation is performed in the gate 2 in step S6. Radio waves for reading a wireless IC tag are transmitted from the antennas 11, 12, 13, and 14 (steps S5 and S6 correspond to a radio wave transmission step). Specifically, as shown in FIG. 5, the personal computer 16 determines whether or not the read / dryer 15 has passed the predetermined time after the entrance door 3 is fully closed based on the entrance open / close state signal input from the control box 10. Then, the radio wave irradiation from each of the antennas 11, 12, 13, and 14 is started by outputting a reading start command.
Here, it is not always necessary to wait until the predetermined time elapses after the entrance door 3 is fully closed, and radio wave transmission may be started immediately after the entrance door 3 is fully closed, but wait until the elapse of the predetermined time. Thus, radio wave transmission is performed after the entrance door 3 is completely closed, so that radio waves can be prevented from leaking from the entrance 2a to the outside of the gate 2.

  Subsequently, in step S7, radio waves transmitted from the wireless IC tags 30 attached to the buckets 20 are received by the antennas 11, 12, 13 and 14, and recorded in the wireless IC tags 30 of the buckets 20. The management information being read is read (information reading step). Specifically, when the wireless IC tag 30 attached to each bucket 20 receives a radio wave, the wireless IC tag 30 generates a power supply voltage from the received radio wave and starts up, and uses the management information recorded in the internal memory as a radio wave. Superimpose and transmit. Then, the radio waves of the wireless IC tag 30 received by the antennas 11, 12, 13, and 14 are sent to the reader / writer 15 as received signals. The reader / writer 15 converts the received signals into an IF band, demodulates and demodulates them. By performing the decoding, the management information contained in the received signal is extracted and this management information is output to the personal computer 16.

  The radio waves irradiated from the antennas 11, 12, 13, and 14 are the ceiling surface 4, the left side surface 5, the right side surface 6, and the entrance door of the gate 2 formed of an article such as an electronic substrate in the bucket 20 and a radio wave shielding sheet. The reflected radio wave hitting 3 is reflected again by the article and the radio wave shielding sheet, and this is repeated until it is attenuated. As described above, since the radio wave can be confined inside the gate 2 by using the radio wave shielding sheet, the radio wave does not leak to the outside of the gate 2 and the wireless IC tag of the bucket not related to the inspection is not erroneously read. . In addition, since the radio wave is repeatedly reflected, the radio IC tag 30 is exposed to the radio wave from various directions, and the reading rate can be improved regardless of the position of the radio IC tag 30.

In step S8, the personal computer 16 displays the read management information of the bucket 20 on the screen (information display step). In step S9, the read management information of the bucket 20 and the management information registered in advance in the database. (Hereinafter referred to as a management table) and the comparison result is displayed on the screen (comparison result display step). Specifically, for example, when the gate 2 is installed in the warehousing area, as shown in FIG. 6A, the warehousing confirmation item on the management table registered in advance in the database is “Received”. If a bucket number that is not a target is to be collated and the corresponding bucket number is present in the read bucket number, the receipt confirmation item for that bucket number is registered and displayed as “Received”.
Further, for example, when the gate 2 is installed in the delivery area, as shown in FIG. 6B, the receipt confirmation item on the management table is “Received” and the delivery confirmation item is “Reserved”. If a bucket number that is not a target is to be collated and the corresponding bucket number is present in the read bucket number, the delivery confirmation item for that bucket number is registered and displayed as “issued”.
In addition, when the product number associated with the read bucket number includes the product number of an article that should not be stored in the bucket, or in the bucket If the product number of the article that should have been stored is not included, this may be displayed on the screen as error information.

In step S10, it is determined whether or not a predetermined time (for example, 7 seconds) has elapsed. If “Yes”, radio wave transmission from the antennas 11, 12, 13, and 14 is stopped in step S11. (Radio wave stopping process). Specifically, the personal computer 16 transmits the radio wave by instructing the reader / writer 15 to end the reading after a predetermined time has elapsed (for example, after 7 seconds have elapsed) from the start of radio wave transmission (output of the read start command). To stop. Here, the predetermined time is set to a time necessary for reading the wireless IC tags 30 of all the buckets 20 loaded on the handlift 40.
In addition, as a condition for stopping radio wave transmission, a predetermined time has elapsed since the start of radio wave transmission as described above. However, radio wave transmission is also stopped when the entrance door 3 is opened. May be. By adding such a condition, even when another worker 50 approaches the entrance door 3 by mistake and the entrance door 3 is opened, it is possible to prevent radio waves from leaking outside the gate 2. Can do. In this case, it is desirable to perform radio wave irradiation again after closing the entrance door 3.

 Thus, after stopping the radio wave transmission from the antennas 11, 12, 13, and 14, in step S12, the hand lift 40 loaded with the bucket 20 is carried out from the outlet 2b by the worker 50.

 As described above, according to this embodiment, since the passage inside the gate 2 is covered with the radio wave shielding sheet, the radio wave is not leaked outside the gate 2 during inspection, and is loaded outside the gate 2. The wireless IC tag 30 of the unnecessary bucket 20 is not erroneously read. Further, since the radio wave propagates so as to wrap around while being reflected many times inside the gate 2, the radio IC tag 30 attached to the bucket 20 in which conductive articles such as an electronic board are stacked and stacked. The radio wave can be easily hit and the reading rate can be improved. Further, it is not necessary to provide special equipment outside the gate 2, the work amount of the worker 50 is hardly changed, and the work environment at the site is not impaired. Furthermore, there is no need to make fine adjustments to the output of radio waves or the angle of the antenna.

 In addition, since the exit door is not provided on the exit 2b side of the gate 2, there is a possibility that radio waves may leak from the exit 2b side, but there is no problem if the bucket 20 is not placed on the exit 2b side, Further, since the exit 2b can be opened, a radio wave shielding sheet for the exit door, a sheet winding machine, an infrared sensor, a phototube sensor, and the like are not necessary, and cost reduction and space saving can be realized. Further, even if the worker 50 protrudes from the outlet 2b to the outside of the gate 2, inspection can be performed if the bucket 20 is accommodated inside the gate 2. In addition, by opening the outlet 2b, air permeability and visibility are improved, and work efficiency is improved.

[Second Embodiment]
Next, a second embodiment of the inspection method according to the present invention will be described. FIG. 7 is a schematic configuration diagram of an inspection gate system 1A according to the second embodiment. The difference between the second embodiment and the first embodiment is that the entrance door 3 and the sheet winder in the gate 2 (hereinafter, the gate of the second embodiment is denoted by 2A in order to distinguish it from the first embodiment). 7 is removed, the entrance 2a is in an open state, the exit 2b is provided with an exit door 17 formed of a radio wave shielding sheet, and the exit door 17 is wound and unwound on the top of the exit 2b. The sheet winding machine 18 is installed. In accordance with this, the antennas 11 and 12 are installed on a pipe (not shown) provided on the entrance 2a side of the ceiling surface 4 so that the radio wave is irradiated toward the exit 2b of the gate 2A. . In addition, the antennas 13 and 14 are arranged at the lower left column and the lower right column of the entrance 2a so that radio waves are irradiated toward the outlet 2b of the gate 2A. That is, the direction of radio wave irradiation from each antenna is the reverse of FIG.

  Hereinafter, the inspection method using the inspection gate system 1A in the second embodiment as described above will be described with reference to the flowchart of FIG. In the flowchart of FIG. 8, steps overlapping with the flowchart of FIG. 2 will be described in a simplified manner.

  As shown in FIG. 8, first, in step S21, the presence or absence of an object approaching the entrance 2a of the gate 2A is detected (object detection step). If “Yes” in this step S21, that is, if it is detected that there is an object (worker 50) approaching the entrance 2a of the gate 2A, the exit door 17 is closed in step S22 (exit door closing step). ). Specifically, when the control box 10 detects the presence of an object approaching the entrance 2a of the gate 2A based on the output signal of the infrared sensor 8, the control box 10 unwinds the exit door 17 from the sheet winder 18. Instruct. Thereby, the exit door 17 is unwound by the sheet winder 18 and closed.

  Subsequently, in step S23, after the exit door 17 is fully closed, while the object passes through the entrance 2a of the gate 2A, the antennas 11, 12, 13 and 14 installed in the gate 2A are connected to the wireless IC. Transmits radio waves for reading tags (radio wave transmission process). Specifically, after the exit door 17 is fully closed, the personal computer 16 determines that the reader / writer 15 is in a state where the light receiving state of the photoelectric tube sensor 9 is “no light reception” (the light beam is blocked by an object). The radio wave irradiation from each of the antennas 11, 12, 13 and 14 is performed by outputting a reading start command. Here, similarly to the first embodiment, radio wave irradiation may be performed after a predetermined time has elapsed (for example, after 2 seconds have elapsed) after the exit door 17 is fully closed.

In step S24, radio waves transmitted from the wireless IC tags 30 attached to the buckets 20 are received by the antennas 11, 12, 13, and 14, and are recorded on the wireless IC tags 30 of the buckets 20. Management information is read (information reading step).
The radio waves irradiated from the antennas 11, 12, 13 and 14 are transmitted from an article such as an electronic substrate in the bucket 20 and a ceiling surface 4, a left side surface 5, a right side surface 6 and an exit door of the gate 2A formed of a radio wave shielding sheet. The reflected radio wave hitting 17 is reflected again by the article and the radio wave shielding sheet, and this is repeated until it is attenuated. That is, similarly to the first embodiment, since the radio wave can be confined inside the gate 2A, the radio wave does not leak to the outside of the gate 2A, and a wireless IC tag in a bucket unrelated to inspection is not read erroneously. In addition, since the radio wave is repeatedly reflected, the radio IC tag 30 is exposed to the radio wave from various directions, and the reading rate can be improved regardless of the position of the radio IC tag 30.

  Subsequently, in step S25, the personal computer 16 displays the management information of the read bucket 20 on the screen (information display step), and in step S26, the management information of the read bucket 20 and the management registered in advance in the database. The information (management table) is compared, and the comparison result is displayed on the screen (comparison result display step).

  Then, in step S27, it is determined whether or not a predetermined time (for example, 7 seconds) has elapsed since the start of radio wave transmission. If “Yes”, the signal from the antennas 11, 12, 13 and 14 is determined in step S28. Stop radio wave transmission (radio wave stop process). Here, the condition for stopping the radio wave transmission is that a predetermined time has elapsed since the start of radio wave transmission as described above, but in addition to this, all of the objects (that is, the worker 50, the handlift 40, the bucket 20). Or the like) may enter the gate 2A, the radio wave transmission may be stopped.

In step S29, after the transmission of radio waves is stopped, the exit door 17 is opened (exit door opening step). Specifically, the personal computer 10 instructs the sheet winding machine 18 to roll up the exit door 17 via the control box 10. Thereby, the exit door 17 is wound up and opened by the sheet winder 18.
Thus, after the exit door 17 is opened, the hand lift 40 loaded with the bucket 20 is carried out from the exit 2b by the worker 50 in step S30.

 As described above, according to the second embodiment, similarly to the first embodiment, it is possible to prevent leakage of radio waves and to read a wireless IC tag without providing special equipment or increasing the work amount of the worker. The rate can be improved. In the second embodiment, since no entrance door is provided on the entrance 2a side of the gate 2A, radio waves may leak from the entrance 2a side. However, if the bucket 20 is not placed on the entrance 2a side, There is no problem and this is particularly effective when the bucket 20 that is not related to inspection is placed outside the outlet 2b of the gate 2A.

  In the first and second embodiments described above, the case where the ceiling surface 4 of the gate 2 (2A) is formed of a radio wave shielding sheet has been described. If there is no possibility of reading the IC tag 30 or if there is no effect on the reading rate, the ceiling may be opened. The cross-sectional shape of the gate 2 (2A) is not limited to a rectangle, and may be a mountain shape or a circle. In addition, as management information to be recorded in the wireless IC tag 30, information such as the type and quantity of articles can be recorded. Furthermore, the articles stored in the bucket are not limited to conductive articles.

 DESCRIPTION OF SYMBOLS 1, 1A ... Inspection gate system 2, 2A ... Gate, 2a ... Inlet, 2b ... Outlet, 3 ... Entrance door, 4 ... Ceiling surface, 5 ... Left side, 6 ... Right side, 7, 18 ... Sheet winding machine, DESCRIPTION OF SYMBOLS 8 ... Infrared sensor, 9 ... Photoelectric tube sensor, 9a ... Light projector, 9b ... Light receiver, 10 ... Control box, 11, 12, 13, 14 ... Antenna, 15 ... Lead dryer, 16 ... Personal computer, 17 ... Exit door, 20 ... Bucket, 30 ... wireless IC tag, 40 ... hand lift, 50 ... worker

Claims (4)

Using an inspection gate system having a gate having a radio wave shielding function on at least both sides and the entrance door, when the inspection object passes through the gate, it is managed from a wireless IC tag attached to the inspection object An inspection method for inspecting by reading information,
An object detection step of detecting the presence or absence of an object approaching the gate entrance;
An entrance door opening step of opening the gate entrance door when it is detected that there is an object approaching the gate entrance in the object detection step;
An intrusion detection step for detecting whether or not all of the object has entered the gate;
An entrance door closing step for closing the entrance door when it is detected in the intrusion detection step that all of the object has entered the gate;
After the entrance door is fully closed, a radio wave transmitting step for transmitting radio waves from the antenna installed in the gate toward the object;
An information reading step of reading management information recorded on the wireless IC tag by receiving radio waves transmitted from the wireless IC tag attached to the inspection object included in the object with the antenna;
A radio wave stopping step of stopping transmission of the radio wave after the predetermined condition is satisfied;
An inspection method comprising: Using an inspection gate system having a gate having a radio wave shielding function on at least both sides and the exit door, when the inspection object passes through the gate, it is managed from a wireless IC tag attached to the inspection object An inspection method for inspecting by reading information,
An object detection step of detecting the presence or absence of an object approaching the gate entrance;
An exit door closing step for closing an exit door of the gate when an object approaching the entrance of the gate is detected in the object detection step;
After the exit door is fully closed, while the object is passing through the entrance of the gate, a radio wave transmission step of transmitting radio waves from the antenna installed in the gate toward the object;
An information reading step of reading management information recorded on the wireless IC tag by receiving radio waves transmitted from the wireless IC tag attached to the inspection object included in the object with the antenna;
A radio wave stopping step of stopping transmission of the radio wave after the predetermined condition is satisfied;
After stopping the transmission of the radio wave, an exit door opening step for opening the exit door;
An inspection method comprising: Information display step of displaying management information of the inspection object read in the information reading step on an information processing terminal installed in the gate;
A comparison result display step of comparing the read management information with the management information of the inspection object registered in advance, and displaying the comparison result on the information processing terminal;
The inspection method according to claim 1, further comprising:  The inspection method according to any one of claims 1 to 3, wherein, in the radio wave transmission step, the radio wave is transmitted after a predetermined time has elapsed since the entrance door or the exit door is fully closed. .

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