JP2008084058A - Rfid reader, radio wave output control method of rfid reader - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve work efficiency without degrading handling in reading an RFID tag. <P>SOLUTION: Three of the four lateral sides of front, back, right, and left, other than the front face are composed of a shield 6 comprising a main body of an RFID reader 5, a first side plate, and a second side plate. The front face and the face above a mounting stand are opened. A user of this reader can place distribution articles 3 one by one from the direction convenient for the work, and take out the distribution articles 3 easily. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an RFID reader and a radio wave output control method for the RFID reader.

  In recent years, RFID technology has been used in which identification information is stored in an RFID (Radio Frequency Identification) tag and the identification information is read in a wireless manner using radio waves or electromagnetic waves. For example, it has been proposed to provide an RFID tag in a distribution item such as a postal item and perform management in the distribution process based on identification information stored in the RFID tag.

  In general, as an RFID reader used for this kind of management, the antenna output of the RFID reader is compared to a case where dozens of registered mails with RFID tags are loaded in a storage case and read one by one. The RFID tags provided on all registered mail items in the storage case are collectively read and processed. However, when the antenna output of the RFID reader increases, radio wave leakage increases, and information on unnecessary RFID tags in the vicinity of the RFID reader may be erroneously read.

In response to this problem, there has been proposed an RFID reader capable of preventing leakage of radio waves to the outside when reading and writing the RFID tag. This RFID reader is constituted by a hollow device main body having an antenna on the inner wall surface and a storage case having a lid portion by a shield member. When the storage case is inserted into the device main body, The lid portion closes the opening of the hollow portion of the apparatus main body (see, for example, Patent Document 1).
JP 2001-319191 A

  However, in the conventional RFID reader, in order to read the identification information of the RFID tag, the distribution item with the RFID tag is stored in the storage case, and the storage case is further carried into the hollow portion of the RFID reader to open the opening. The act of sealing is required, handling of the distribution is impaired, and work efficiency is deteriorated.

  Accordingly, an object of the present invention is to provide an RFID reader and a radio wave output control method for the RFID reader that improve the working efficiency without impairing handling.

A mounting table on which a distribution object provided with an RFID tag storing identification information is mounted;
An RFID having a surface provided with an antenna vertically attached to the mounting table, transmitting and receiving radio waves to and from the RFID tag of the circulation through the antenna, and reading identification information from the RFID tag of the circulation by a wireless method A reader body;
An L-shape which is attached to the mounting table and has a first side plate facing the surface provided with the antenna and a second side plate which extends from the first side plate perpendicularly to the end of the RFID reader body. And a shielding member that shields the radio wave of
The placing table, the RFID reader main body, and the shield member constitute a placement area for the distribution material in which the upper and front surfaces of the upper, lower, left, and front surfaces are open. An RFID reader characterized by the above.

  According to the present invention, it is possible to provide an RFID reader and a radio wave output control method for the RFID reader that have improved handling efficiency without impairing handling.

Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)

  FIG. 1 is a perspective view schematically showing an RFID reader according to a first embodiment of the present invention.

  The RFID reader 1 includes a mounting table 4 on which a circulation item 3 with an RFID tag 2 attached is placed, an RFID reading device main body 5 that reads identification information of the RFID tag 2 of the circulation item 3, and a shield member 6. .

  The mounting table 4 has a rectangular shape with a flat upper surface, for example, a rectangular plate-like structure.

  The RFID reader main body 5 has a rectangular housing, and an antenna 7 for transmitting and receiving radio waves is provided on the side of the housing. An electronic circuit component for reading the identification information of the RFID tag 2 is built in the housing, and a reading switch 8 is provided on the front surface of the housing. The RFID reader main body 5 is mounted vertically on one end of the mounting table 4 with the antenna 7 inside the RFID reader 1. Therefore, the transmission wave from the antenna 7 is radiated forward of the antenna 7 mainly along the upper surface of the mounting table 4, and is not emitted so much in the lateral direction and upward direction of the antenna 7.

  The shield member 6 has an L shape having a first side plate 9 and a second side plate 10 extending in a direction orthogonal to the first side slope, and the first side plate 9 faces the antenna 7 of the RFID reader body 5. Thus, the second side plate 10 is mounted vertically on the upper surface of the end opposite to the end of the mounting table 4 to which the RFID reader main body 5 is attached, and the second side plate 10 is connected to the end of the RFID reader main body 5 and the first side plate 9. It is vertically mounted on the mounting table 4 so as to close the gap between the two ends.

  The first side plate 9 of the shield member 6 has a function of blocking the transmission wave from the antenna 7 from leaking out of the RFID reader 1 and the transmission wave from the RFID tag 2 of the product 3 outside the RFID reader 1. The second side slope 10 has a function of blocking transmission wave leakage and entry in the same manner as the first side plate 9, as well as a stopper for positioning when the flowable material 3 loads the mounting table 4. It has the function of.

  The shield member 6 is not necessarily attached to the upper surface of the mounting table 4, and may be attached to the side surface of the mounting table 4, for example, as shown in FIG.

  The shield member 6, the mounting table 4, and the RFID reader main body 5 constitute a placement area 12 for the distribution material in which the upper and front of the RFID reader 1 are opened in the front, rear, left, and right, and up and down. The circulation 3 is loaded into the circulation placement area 12 from above, in front, or obliquely from above.

  Further, the shield member 6 shields a transmission wave from the RFID reader main body 5 to the outside, or shields a reception wave from the RFID tag of the circulation 3 outside the RFID reader 1, and is placed near the RFID reader 1. The RFID tag of the distributed product 3 can be prevented from being read, and the identification information of the RFID tag 2 of the distributed product 3 loaded in the mounted region 12 of the distributed product can be read accurately.

  Here, the shield member 6 is made of a material that blocks radio waves (transmitted waves). For example, a resistance film used for EMI countermeasures, a composite material of rubber and carbon, a fiber having carbon attached thereto, a polystyrene foam, An electromagnetic wave absorbing material such as urethane foam or an electromagnetic wave reflecting material such as a metal material such as aluminum or copper is used.

  FIG. 3 is a block diagram showing the circuit configuration of the electronic circuit component of the RFID reader main body 5 and the RFID tag 2.

  An electronic circuit component of the RFID reader main body 5 includes an interface unit 13 that functions as an interface with a PC provided outside the RFID reader 1, a control unit 14 including a CPU and a memory, and an RFID tag from the control unit 14. Modulation unit 15 that modulates transmission information to 2, output unit 16 that amplifies the modulated radio wave from modulation unit 15 and transmits the radio wave from antenna unit 17, and amplification unit 18 that amplifies the radio wave received by antenna unit 17 And a demodulator 19 that demodulates the amplified received radio wave and transmits the demodulated radio wave to the controller 14.

  The RFID tag 2 includes a tag antenna 20, a power generation unit 21 that supplies power to each circuit unit by rectifying the modulated radio wave received by the tag antenna 20, and a demodulator that demodulates the modulated radio wave and transmits it to the control unit 22. 23, a modulation unit 24 that modulates information transmitted from the control unit 22 and transmits it to the tag antenna 20, a storage unit 25 that stores identification information and the like, and information demodulated by the demodulation unit 23 is a predetermined read command. At this time, a control unit 22 or the like that reads the identification information from the storage unit 25 and transmits it to the modulation unit 24 is provided.

  Next, the operation of the RFID reader according to the present embodiment will be briefly described with reference to FIG. 1 and FIG.

  First, as shown in FIG. 1, the circulation 3 such as a postal envelope is placed inside the placement area 12 of the circulation such that the RFID tag 2 faces the antenna 7 side of the RFID reader 5 and the circulation 3 such as a postal envelope is placed. Dozens (for example, 30) are placed horizontally on the mounting table 4. In order to load the distribution items 3, the distribution items 3 are placed in a bundle from above, in front of, or obliquely above the RFID reader 1, or individually. In the loading of the flowed product 3, the flowed product 3 is placed with the ends aligned by the stopper function of the second side plate 10 of the shield member 6.

  Subsequently, by operating the PC or operating the reading start switch 8 provided in the RFID reader main body 5, the RFID reader main body 5 is driven to start the reading operation. In the RFID reader main body 5, a predetermined read command from the PC is transmitted to the control unit 14 via the interface unit 13, and the predetermined read command transmitted from the control unit 14 is modulated into a radio wave by the modulation unit 15 and output. A radio wave transmitted from the antenna unit 17 via the unit 16 and radiated from the antenna unit 17 is transmitted to each RFID tag 2 in the placement area 12 of the distribution item.

  On the other hand, the radio wave reaching the shield member 6 is absorbed or reflected by the shield member 6, and leakage from the RFID reader 1 is prevented. In addition, reading of the RFID tag 2 in the non-reading circulation 3 placed in the vicinity of the RFID reader 1 can be prevented.

  In the RFID tag 2 in the circulating material placement area 12, when the transmission wave from the antenna unit 17 is received by the tag antenna 20, power is supplied from the power generation unit 21 to each circuit unit and stored in the storage unit 25. The identification information is read out to the control unit 22. The identification information read by the control unit 22 is sent to the modulation unit 24 and transmitted via the tag antenna 20. The radio wave from the RFID tag 2 of the distribution 3 is received by the antenna unit 17 of the RFID reader main body 5 and taken into the PC through the control unit 14 and the interface unit 13.

  When the reading is finished, the article 3 is taken out from the RFID reader 1 and it is selected whether the reading operation of the new article 3 is continued or finished. In this way, the identification information of the RFID tag 2 in the placement area 12 of the distribution item of the RFID reader 1 is read.

According to the RFID reader of the first embodiment, the upper side and the front side of the RFID reader 1 are open. The handling of the taking-out operation is good and the working efficiency is improved. Further, since the shield 6 can prevent reading of the RFID tag 2 of the article 3 outside the RFID reader 1, the reading accuracy is improved.
(Modification of the first embodiment)

  FIG. 4 is a schematic view showing a modification of the mounting table in the RFID reader according to the first embodiment. In the mounting table 4 of FIG. 4A, a U-shaped recess 27 extending from the front end portion toward the rear end portion is provided on the mounting surface (upper surface) 26 of the flowable material 3, and below the lowermost flowable material 3. In other words, a clearance is provided between the mounting table 4 and the mounting surface 26 to facilitate the removal of the article 3 from the mounting table.

  4B includes a U-shaped notch 28 that is notched from the front end portion toward the rear end portion, and is distributed from the placement table with a gap below the lowermost flow 3. The object 3 is easily taken out.

  Moreover, in the mounting table 4 of FIG.4 (c), the convex part 29 inclined in the rear-end part direction is provided in the vicinity of the front-end part of the mounting surface 26 of the flow material 3, and the downward direction of the flow material 3 of the lowest layer, ie, A clearance is provided between the mounting table 4 and the mounting surface 26 to facilitate removal of the article 3 from the mounting table. The convex portion 29 may move or rotate up and down, or may have a flat structure. There is no problem as an RFID reader.

According to the RFID reader of the modified example of the first embodiment, the circulation 3 is removed when the circulation 3 is removed from the circulation placement area 12 by providing a gap below the circulation 3 in the lowermost layer. It is easy to grasp. Therefore, the handling efficiency is further improved as compared with the RFID reader according to the first embodiment.
(Second Embodiment)

Next, an RFID reader according to a second embodiment of the present invention will be described.
FIG. 5 is an exploded perspective view of the RFID reader according to the second embodiment of the present invention. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. The RFID reader according to the present embodiment is capable of individually reading a distribution item having a size exceeding the distribution item storage area in addition to reading several tens of distribution items at once. .

  The RFID reader 30 is composed of a mounting table 31 on which the circulation 3 to which the RFID tag 2 is attached is placed, an RFID reader main body 34 that reads identification information of the RFID tag 2 of the circulation 3, and the shield member 6. .

  The mounting table 31 has a rectangular shape with a flat upper surface, for example, a rectangular plate-like structure. The left end of the mounting table 31 (the left end in the drawing) has a lower end of the RFID reader main body 34. A slit-like first groove 32 for fitting the portion is formed, and both ends are provided at the right end (the right end) and the rear end (the rear end) of the mounting table 31. An L-shaped second groove 33 for fitting the lower end portion of the shield member 6 across the portion is formed. The second groove 33 includes a groove portion 33a in which the first side plate 9 of the seal member 6 is fitted and a groove portion 33b in which the second side plate 10 is fitted.

At the bottom of the first groove 32 of the mounting table 31, a connector 37 for transmitting a signal from a shield detection sensor 36 described later to the RFID reader book 34 is provided.
Further, a shield detection sensor 36 as a shield detection means for detecting the presence or absence of the shield member 6 is provided on the inner surface of the groove portion 33a in which the first side plate 9 of the second groove 33 is fitted, and a connector. 37 is electrically connected. The shield detection sensor 36 may be provided not only in the groove portion 33a in which the first side plate 9 is fitted, but also in the groove portion 33b in which the second side plate 10 is fitted. For example, an optical sensor or a simple electrical switch is used as the shield detection sensor 36.

  The RFID reader main body 34 has a rectangular housing, an antenna 7 for transmitting and receiving radio waves is provided on the side of the housing, and an electronic device for reading identification information of the RFID tag 2 is provided inside the housing. A circuit component is built in, and a connection terminal 35 is provided as a transmission means for engaging with the connector 37 on the bottom surface of the lower end of the housing. The RFID reader main body 34 is detachably supported on the mounting table 31 by setting the antenna 7 inside the RFID reading device 1 and fitting the lower end portion thereof into the first groove 32 of the mounting table 31. The connection terminal 35 of the RFID reader main body 34 is automatically engaged with the connector 37 when the lower end portion of the RFID reader main body 34 is fitted into the first groove 32 of the mounting table 31.

  The shield member 6 includes a first side plate 9 and a second side plate 10 extending in a direction orthogonal to the first side slope. The first side plate 9 is opposed to the antenna 7 of the RFID reader main body 34, and the second side plate 10. And the second side plate 10 is detachably supported on the mounting table 31 by fitting the second side plate 10 into the second groove portion 33b.

  FIG. 6 is a block diagram showing a main configuration of the RFID reader 30 according to the second embodiment of the present invention. The same parts as those of the RFID reader of the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. Here, the block diagram of the RFID tag 2 of the distribution item 3 is the same as that of the first embodiment, and the illustration is omitted.

  As shown in FIG. 6, the RFID reader 30 includes a shield detection sensor 36, a connector 37 for transmitting a signal from the shield detection sensor 36 to the control unit 38 of the RFID reader main body 34, and the received shield detection sensor 36 from the shield detection sensor 36. The output unit 39 is controlled based on the signal, and the control unit 38 that transmits the transmission information to the RFID tag 2 to the modulation unit 15, and the output of the modulated radio wave transmitted from the antenna unit 17 is adjusted based on the signal from the control unit 38. An output unit 39 is provided.

  FIG. 7 is a flowchart showing a flow of processing for detecting the shield and adjusting the output of the RFID reader main body. First, in step 1 (hereinafter simply referred to as “S1”), basic settings are performed by operating the PC. That is, for example, a high output necessary for reading 30 RFID tags at a time and a low output necessary for reading one RFID tag are set.

  Next, the presence or absence of the shield member 6 is detected by the shield detection sensor 36 (S2). When the shield member 6 is attached to the mounting table 4, the output of the output unit 39 is adjusted to the high output set in Step 1 based on the “present” signal from the control unit 38 (S 3), and the shield member If 6 is not attached to the mounting table 31, the output of the output unit 39 is adjusted to the low output set in step 1 based on the “No” signal from the control unit 38 (S4).

The operation of the RFID reader according to this embodiment will be briefly described below.
First, when it is desired to read a plurality of articles 3 at a time, the shield member 6 is attached to the second groove 33 of the mounting table 31. The shield detection sensor 36 detects that the shield member 6 is attached and transmits a signal to the control unit 38 via the connector 37. When the control unit 38 transmits the transmission information to the RFID tag 2 to the modulation unit 15 and receives a signal from the shield detection sensor 36, the control unit 38 outputs a preset number of RFID tags that can be read collectively. A control signal is transmitted to the output unit 39 so that The output unit 39 adjusts the output based on the control signal from the control unit 38, amplifies the modulated radio wave from the modulation unit 15, and transmits the amplified radio wave from the antenna unit 17. Subsequent operations are the same as those in the first embodiment, and a description thereof will be omitted.

  On the other hand, when the articles 3 are read individually, for example, when the articles 3 are too large and the RFID tag cannot be read with the shield member 6 attached to the stage 31, the shield member 6 is placed on the stage 31. Remove more. Since the shield member 6 is not attached to the mounting table 31, the shield detection sensor 36 transmits information “no shield” to the control unit 38 via the connector 37. When the control unit 38 receives a signal from the shield detection sensor 36, the control unit 38 transmits transmission information to the RFID tag 2 to the modulation unit 15 and low output necessary for individually reading the RFID tag set in advance. The control signal is transmitted to the output unit 39 so that The output unit 39 adjusts the output to be small based on the control signal from the control unit 38, amplifies the modulated radio wave from the modulation unit 15, and transmits the amplified radio wave from the antenna unit 17. Subsequent operations are the same as those in the first embodiment, and a description thereof will be omitted.

  Here, when the shield member 6 is not attached to the mounting table 31, a signal “presence / absence of shield” is transmitted from the shield detection sensor 36. However, the present invention is not limited to this, and no signal is transmitted. Therefore, it may be determined that “no shield”.

  In the RFID reader according to the second embodiment, when reading a plurality of RFID tags 2 at a time, the antenna output is increased and the shield member 6 is attached to the mounting table 31 so that the outside of the RFID reader 1 is removed. Since the reading of the RFID tag 2 of the circulated product 3 can be prevented, the reading accuracy is improved.

  On the other hand, when the RFID tag 2 cannot be read in a state where the distribution material is large and the shield member 6 is attached to the mounting table 31, the RFID reading device is removed by removing the shield member 6 from the mounting table 31 and lowering the antenna output. Reading of RFID tags that are not to be read placed in the vicinity of the.

Therefore, by attaching and detaching the shield member 6, it is possible to read a plurality of RFID tags at once or read each of the RFID tags individually, and it is possible to read various distribution items. Moreover, since the antenna output is controlled in conjunction with the attachment / detachment of the shield member 6 from the mounting table 31, the reading work efficiency is good. In addition, when reading a plurality of RFID tags at a time, the shield member prevents radio wave leakage to the outside of the IRFID reader, and when reading each RFID tag, the antenna output is lowered and the RFID tag is not to be read. Therefore, the identification information of the RFID tag can be read with high accuracy.
(Third embodiment)

  FIG. 8 is a schematic diagram showing an RFID reader according to a third embodiment of the present invention. The same parts as those of the RFID reader of the second embodiment are denoted by the same reference numerals, and description thereof is omitted.

  In the RFID reader 40 of the present embodiment, the shield 42 has a first side plate 43 and a second side plate 44 separated from each other, and the first side plate 43 and the second side plate 44 are a rotary fastener, For example, it is provided so as to be rotatable by a hinge 45. The second side plate 44 of the shield member 42 is fixed to the rear end surface of the mounting table 41 with screws or the like, and the first side plate 43 is in contact with or separated from the right side surface of the mounting table 41, that is, is attached or detached.

  The right side surface of the mounting table 41 is provided with a shield detection sensor 47 and a fastener 46 such as a magnet. The first side plate 43 of the shield member 42 is temporarily fixed to the right side surface of the mounting table 41 by the fastener 46. Then, the shield detection sensor 47 detects the contact / separation state of the first side plate 43 with the mounting table 41. As the shield detection sensor 47, an optical sensor, an electrical switch, or the like is used as in the RFID reader of the second embodiment.

  A slit-like first groove 32 is provided at the left end portion of the mounting table 41, and a connection terminal 35 (in the RFID reader 34 of the second embodiment is formed on the bottom surface of the first groove 32. A connector 37 (not shown) that mates with a not-shown connector is provided, and the connector 37 and the shield detection sensor 47 are electrically connected.

  The RFID reader main body 34 has the same configuration as that of the RFID reader main body of the second embodiment, and the lower end is fitted in the slit-like first groove 32 provided at the left end of the mounting table 41. The connection terminal 35 (not shown) is engaged with the connector 37 while being supported by the mounting table 41.

  In the RFID reader of this embodiment, when a plurality of RFID tags are read at once, the first side plate 43 is temporarily fixed to the mounting table 41 with a fastener 46 and read. On the other hand, in order to individually read the flow articles having a size exceeding the placement area of the flow articles, the first side plate 43 is opened and read away from the placement table 41.

  The description of other configurations and operations is the same as that of the PDIF reader according to the second embodiment, and will not be repeated.

  In the RFID reader of the third embodiment, as in the RFID reader of the second embodiment, when reading a plurality of RFID tags at a time, the antenna output is increased and the shield member 42 is used. When the RFID tag 2 cannot be read in a state where the first side plate 43 is attached to the mounting table 41 and the flowed material is large and the shield member 42 is attached to the mounting table 41, the first side plate 43 of the shield member 42 is attached. By separating from the mounting table 41 and lowering the antenna output, it is possible to read a plurality of RFID tags at a time and to read individual RFID tags, and to read various distribution items. Moreover, since the antenna output is controlled in conjunction with the contact / separation state of the shield member 42 from the mounting table 41, the reading work efficiency is good.

  In addition, the RFID tag identification information is read with high accuracy because the RFID tags that are not to be read are not read in both cases of reading a plurality of RFID tags at once and reading each RFID tag individually. be able to.

  Furthermore, when collectively reading a plurality of RFID tags and individually reading the RFID tags, it is only necessary to bring the first side plate 43 of the shield member 42 into and away from the mounting table 41, and the handling efficiency can be improved.

  It should be noted that the present invention is not limited to the above-described embodiment, and various modifications may be made without departing from the spirit of the invention, and the above-described embodiments may be combined as appropriate. May be.

1 is a perspective view schematically showing an RFID reader according to a first embodiment of the present invention. The perspective view which shows roughly the modification of the RFID reader of 1st Embodiment which concerns on this invention. The block diagram which shows the principal part structure of the RFID reader and RFID tag of 1st Embodiment concerning this invention. The perspective view which shows the modification of the mounting base in the RFID reader of 1st Embodiment which concerns on this invention. The block diagram which shows the principal part structure of a main body and an RFID tag. The disassembled perspective view which shows schematically the RFID reader of 2nd Embodiment which concerns on this invention. The block diagram which shows the principal part structure of the RFID reader of 2nd Embodiment which concerns on this invention. 7 is a flowchart showing adjustment of antenna output in the RFID reader according to the second embodiment of the present invention. FIG. 5 is a perspective view schematically showing an RFID reader according to a third embodiment of the invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 30, 40 RFID reader 2 RFID tag 3 Distribution thing 4, 31, 41 Mounting stand 5, 34 RFID reader main body 6, 11, 42 Shield member 7 Antenna 8 Reading start switch (instruction means)
9, 43 1st side plate 10, 44 2nd side plate 12 Placement area | region 14,38 of a flow material Control part 26 Placement surface 27 U-shaped recessed part 28 U-shaped cut part 29 Convex part 32 1st groove | channel 33 2nd Groove 35 connection terminal (transmission means)
36, 47 Shield detection sensor 37 Connector 45 Hinge (rotating fastener)
46 Fastener

Claims (12)

A mounting table on which a distribution object provided with an RFID tag storing identification information is mounted;
An RFID having a surface provided with an antenna vertically attached to the mounting table, transmitting and receiving radio waves to and from the RFID tag of the circulation through the antenna, and reading identification information from the RFID tag of the circulation by a wireless method A reader body;
An L-shape which is attached to the mounting table and has a first side plate facing the surface provided with the antenna and a second side plate which extends from the first side plate perpendicularly to the end of the RFID reader body. And a shielding member that shields the radio wave of
The placing table, the RFID reader main body, and the shield member constitute a placement area for the distribution material in which the upper and front surfaces of the upper, lower, left, and front surfaces are open. An RFID reader characterized by the above.   The RFID reader according to claim 1, wherein the mounting table further includes a first groove for detachably fitting a lower end portion of the RFID reader main body.   The RFID reader according to claim 1, wherein the mounting table further includes a second groove for detachably fitting the shield member. Further, a shield detecting means provided in the second groove for detecting whether or not the shield member is fitted in the second groove;
A transmission means for transmitting a detection result of the shield detection means to the RFID reader body;
Control means for adjusting the radio wave output of the antenna based on the detection result of the shield detection means from the transmission means;
The RFID reader according to claim 3, further comprising: The transmission means includes
A connection terminal provided at the lower end of the RFID reader main body,
A connector provided in the first groove and engaged with the connection terminal;
The RFID reader according to claim 4, further comprising:   The RFID reader according to claim 1, wherein the first side plate is attached to a side surface of the mounting table. And a pivoting fastener for pivotally attaching the first side plate to the second side plate;
A fastener for detachably attaching the first side plate to the side surface of the mounting table;
The RFID reader according to claim 6, further comprising: Furthermore, a shield detecting means provided on a side surface of the mounting table, and detecting a detachment state between the first side plate and the side surface of the mounting table,
A transmission means for transmitting a detection result of the shield detection means to the RFID reader body;
Control means for adjusting the radio wave output of the antenna based on the detection result of the shield detection means from the transmission means;
The RFID reader according to claim 7, further comprising: The transmission means includes a connection terminal provided at a lower end portion of the RFID reader main body,
A connector provided in the first groove and engaged with the connection terminal;
The RFID reader according to claim 8, comprising:   The RFID reader according to any one of claims 1 to 9, further comprising take-out assisting means for facilitating removal of a product to be loaded on the placing surface of the placing table.   11. The RFID reader according to claim 1, further comprising an instruction unit that instructs the RFID reader main body to start reading the RFID tag.   An RFID comprising: detecting a detachable state of a shield member detachably attached to a mounting table so as to face a surface of the RFID reader body having an antenna; and adjusting a radio wave output of the antenna based on the detection result Radio wave output control method of reading device.

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