JP2007156672A - Reader/writer module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the stable operation of a reader/writer module. <P>SOLUTION: This electronic equipment is configured by forming a wiring board having predetermined wiring at a predetermined section; a loop-shaped antenna formed on one surface of a wiring board, and connected to wiring; and a plurality of electronic components loaded on the wiring board in the inside region of the loop of the antenna, wherein a predetermined circuit for communication is formed of the wiring of the wiring board and a plurality of electronic components. An electromagnetic shield constituted of conductive materials is arranged on the wiring board corresponding to the predetermined region including the electronic components configuring the control section of the circuit for communication. The electromagnetic shield is constituted of a film having an insulating adhesive layer on the first surface and a conductive layer formed so as to be overlapped on the second face which is opposite to the first face of the film, and the electromagnetic shield is bonded through an adhesive layer to the opposite face of the wiring board face on which electronic components configuring the control section of the circuit for communication are loaded. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a small reader / writer module capable of reading and writing non-contact type IC cards, tags, labels, and the like.

  A contactless tag (radio tag) called RFID (Radio Frequency-Identification) is used for physical distribution management. When an article attached with a wireless tag passes through a management section such as a gate provided with a reader / writer, the wireless tag receives radio waves oscillated by the reader / writer. Then, the IC inside the wireless tag performs signal processing based on the command or data superimposed on the radio wave, and the processing result is sent back to the reader / writer by radio wave. The management section manages the article based on the returned information (for example, Patent Document 1).

  On the other hand, a reader / writer (reader / writer module) conforming to ISO / IEC15693 is known as one of reader / writers (for example, Non-Patent Document 1). Non-Patent Document 1 discloses a reader / writer module having a carrier frequency of 13.56 MHz and a communication distance of 40 mm or less or 80 mm or less. Some of the reader / writer modules are configured to light up LEDs when the reader / writer is operating.

JP 2004-88290 A http://www.akita-elec.co.jp/pdf/rfrs01.pdf

  After examining the characteristics improvement and stable operation of the reader / writer (reader / writer module), the following facts were found. FIG. 10 shows a test apparatus 40 that can change the distance a between the reader / writer (reader / writer module) 1 and the wireless IC tag 35. On a flat table 41 of the test apparatus 40, a reader / writer fixing jig 42 is disposed. The reader / writer fixing jig 42 has a structure capable of holding the reader / writer 1 vertically although not described in detail. A movable support jig 43 that is movable is placed on the table 41. The movable support jig 43 includes a support base 44 and an attachment plate 45 fixed perpendicularly to the upper surface of the support base 44. Although not described in detail in detail, the wireless IC tag 35 is detachably attached to the attachment plate 45. The distance a can be changed by changing the position of the movable support jig 43 with respect to the reader / writer fixing jig 42.

  By using such a test apparatus 40 and changing the distance a, the distance performance confirmation inspection of the reader / writer 1 can be performed. When the movable support jig 43 is moved away from the reader / writer fixing jig 42 and the distance a is made longer than the communication distance, the electromagnetic coupling between the reader / writer 1 and the wireless IC tag 35 becomes weaker, and the magnetic field energy that reaches is also reduced. At this time, the wireless IC tag 35 cannot obtain energy (electromotive force) necessary for operation. As a result, the wireless IC tag 35 cannot respond, and the computer (CPU) of the reader / writer 1 that cannot confirm the reply turns off the light emitting diode (LED).

  When the wireless IC tag 35 reacts to the communication of the reader / writer 1 and the reader / writer 1 can confirm the reception of the reply, the CPU turns on the LED provided in the reader / writer 1. If the wireless IC tag 35 does not react and the reader / writer 1 cannot receive the reply, the CPU turns off the LED.

  If the distance a is adjusted and the distance a is set within the communication distance of 40 mm or less or 80 mm or less, the communication with the wireless IC tag 35 is established, and the CPU lights the LED.

  When the distance performance confirmation program is operated in the above environment, the LED may repeatedly turn on and off unexpectedly even when the distance is longer than the communication distance that is the communicable distance, and the CPU may malfunction. There was found.

  On the other hand, as a result of comparing the transmission outputs of the reader / writer determined to be non-defective and the reader / writer determined to be defective in the distance performance confirmation inspection, the results shown in the graph of FIG. 7 were obtained. An example of output of defective products and non-defective products shown before the graph in FIG. 7 is the result. The non-defective product (sample number 567) has an output of about 3.5 dBm which is lower than 4.00 dBm, whereas the defective product (sample number 480) has a high output of about 5.8 dBm which is higher than 5.00 dBm. The difference is as large as 2.2 dBm.

  The reader / writer has a structure in which an antenna is formed in a loop shape on a rectangular wiring board and a computer and various electronic components controlled by the computer are mounted on a wiring board area inside the loop.

  Therefore, the present inventor considered that an increase in the output of a defective product is equivalent to an increase in the magnetic field generated by the loop antenna, and investigated the influence of the magnetic field generated by the loop antenna on the reader / writer 1.

  FIG. 11A is a schematic plan view of the current reader / writer 1. In the reader / writer 1, a loop-shaped antenna (loop antenna) 3 is disposed along the periphery of the rectangular wiring board 2, and a plurality of electronic components are mounted on the wiring board 2 portion in the inner region of the loop of the loop antenna 3. Has been. FIG. 11A schematically shows a computer (CPU) 5 that controls the transmission / reception unit (RF) 4 and a cable 6 that connects the CPU 5 and the RF 4 as electronic components constituting the communication circuit. When the reader / writer 1 operates and a current flows through the loop antenna 3, a magnetic field (magnetic flux) 7 is generated as shown by an arrow group in FIG. 11B, and the RF 4 and the CPU 5 are located in the magnetic field 7.

  FIG. 12A shows an example in which the reader / writer 1 is formed by using the two wiring boards 37 and 38 that the inventors have experimented. The reader / writer 1 has a structure in which the RF 4 is mounted on one wiring board 37 on which the loop antenna 3 is arranged, the CPU 5 is mounted on the other wiring board 38 on which the loop antenna 3 is not provided, and the CPU 5 and RF 4 are connected by a cable 6. It has become.

  It was found that when the reader / writer 1 is operated and the wiring board 38 is gradually moved away from the wiring board 37, the reader / writer 1 operates normally as the CPU 5 becomes farther from the wiring board 37.

  FIG. 12A shows an arrangement state of the two wiring boards 37 and 38 when the reader / writer 1 operates normally with good reproducibility. FIG. 12B shows a magnetic field 7 generated by the loop antenna 3 at this time. It can be seen that the CPU 5 is sufficiently separated from the wiring board 37 and is not affected by the magnetic field 7 generated by the loop antenna 3 formed on the wiring board 37 at all.

  Experiments by the present inventor show that the reader / writer operates stably by preventing the computer from being affected by the magnetic field lines induced by the loop antenna.

An object of the present invention is to achieve stable operation of an electronic device having a loop antenna and a communication circuit.
Another object of the present invention is to achieve stable operation of a reader / writer module that reads information from a wireless IC tag and writes information to the wireless IC tag.

  The above and other objects and novel features of the present invention will be apparent from the description of this specification and the accompanying drawings.

The following is a brief description of an outline of typical inventions disclosed in the present application.
(1) The electronic device
A wiring board having a predetermined wiring in a predetermined portion;
A loop-shaped antenna formed on one surface of the wiring board and connected to the wiring;
An electronic device having a plurality of electronic components mounted on the wiring board in an inner region of the loop of the antenna, wherein a predetermined communication circuit is formed by the wiring of the wiring board and the plurality of electronic components. There,
An electromagnetic shield made of a conductive material is disposed on the wiring board so as to correspond to a predetermined region including the electronic component constituting the control part of the communication circuit.

  The electromagnetic shield includes a film having an insulating adhesive layer on a first surface and a conductor layer formed on a second surface opposite to the first surface of the film. The electromagnetic shield is bonded to the opposite surface of the wiring board surface on which the electronic component constituting the control part of the communication circuit is mounted via the adhesive layer.

  The electronic device is a reader / writer module that transmits a radio wave to a wireless IC tag, receives a radio wave from the wireless IC tag, reads information on the wireless IC tag, and writes information on the wireless IC tag.

  (2) In the reader / writer module having the configuration of (1), the wiring board is a multilayer wiring board in which a plurality of insulating layers are stacked, and the electromagnetic shield includes the insulating layer and the insulating layer of the multilayer wiring board. It is characterized by being formed of a material for forming the wiring between them and without being connected to the wiring.

  (3) In the reader / writer module in the configuration of (1), the wiring board is a multilayer wiring board in which a plurality of insulating layers are stacked, and the electromagnetic shield includes the insulating layer and the insulating layer of the multilayer wiring board. It is characterized by being formed of a material for forming the wiring between them and connected to the wiring.

  The effects obtained by the representative ones of the inventions disclosed in the present application will be briefly described as follows.

  According to the means of (1), in the reader / writer module, the electromagnetic shield made of a conductive material corresponding to a predetermined region including the electronic components constituting the control part of the communication circuit is provided on the wiring board. It is glued to. Therefore, even when the reader / writer module is operated and an electric field is generated by the loop antenna, the electric field disappears in the portion where the electromagnetic shield is disposed. Therefore, a magnetic field is not generated in the electronic components constituting the control portion of the communication circuit. The reader / writer module operates stably.

  According to the means (2), (a) in the reader / writer module, the electromagnetic shield made of a conductive material corresponding to a predetermined region including the electronic components constituting the control part of the communication circuit is provided on the wiring board. Is provided inside. Therefore, even when the reader / writer module is operated and an electric field is generated by the loop antenna, the electric field disappears in the portion where the electromagnetic shield is disposed. Therefore, a magnetic field is not generated in the electronic components constituting the control portion of the communication circuit. The reader / writer module operates stably.

  According to the means (3), (a) in the reader / writer module, the electromagnetic shielding body made of a conductive material corresponding to a predetermined region including the electronic components constituting the control part of the communication circuit is provided on the wiring board. Is provided inside. Therefore, even when the reader / writer module is operated and an electric field is generated by the loop antenna, the electric field disappears in the portion where the electromagnetic shield is disposed. Therefore, a magnetic field is not generated in the electronic components constituting the control portion of the communication circuit. The reader / writer module operates stably.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiment of the invention, and the repetitive description thereof is omitted.

  1 to 7 are diagrams related to a reader / writer (reader / writer module) according to a first embodiment of the present invention. FIGS. 1 to 4 are diagrams related to the structure of the reader / writer module, FIG. 5 is a block diagram showing a functional configuration of the reader / writer module, and FIG. 6 is a schematic diagram showing a usage form of the reader / writer module.

  The reader / writer module 1 according to the first embodiment has a structure shown in FIGS. 1 is a front view of the reader / writer module 1, FIG. 2 is a plan view of the reader / writer module, FIG. 3 is a bottom view of the reader / writer module, and FIG. 4 is a schematic diagram showing an electromagnetic shield bonded to the reader / writer module. .

  As shown in FIGS. 1 to 3, the reader / writer module 1 includes a rectangular wiring board 2 and a plurality of electronic components 9 mounted on the first surface 2 a of the wiring board 2. A loop antenna 3 and an electromagnetic shielding body 10 are provided on the second surface 2b which is the surface opposite to the first surface 2a of the wiring board 2. Although the structure of the wiring board 2 is not shown, the wiring board 2 has a multilayer wiring structure. Conductive layers are formed in a predetermined pattern on the front and back surfaces and the inner layer surface, and the conductive layers on each surface are connected by penetrating conductors. A desired wiring pattern is formed. For example, in the embodiment, a multilayer wiring structure having a four-layer structure in which three insulating layers and four wiring layers are provided.

  As shown in FIG. 3, the loop antenna 3 formed on the second surface 2b of the wiring board 2 has a structure in which a loop (frame shape) is wound a plurality of times along the outer periphery of the wiring board 2 by a thin conductor. It is connected to a predetermined wiring at a predetermined portion. On the first surface 2a of the wiring substrate 2, electrode pads for mounting discrete electronic components are formed in a predetermined pattern, and the electrodes of the respective electronic components are electrically connected to these electrode pads.

  FIG. 5 is a block diagram showing a functional configuration (circuit configuration) of the reader / writer module 1. The reader / writer module 1 is connected to a computer (CPU) 5, a transmission / reception unit (RF-ASIC) 11 connected to the CPU 5, a tuning circuit 12 connected to the transmission / reception unit 11, a matching circuit 13, and a tuning circuit 12. It has a loop antenna 3, a serial port (RS232C I / F) 14 connected to the CPU 5, and a light emitting diode (LED) 15 connected to the CPU 5.

  The light emitting diode (LED) 15 emits light when the reader / writer module 1 is operating, and serves as a display indicating that the reader / writer module 1 is in an operating state.

  Between the tuning circuit 12 and the CPU 5, a rectifier 17, a filter (BPF) 18, a power amplifier (PA) 19, and a reception decoder 20 are sequentially connected in series to form a reception system circuit.

  A matching circuit 13 is connected to the tuning circuit 12. A filter (LPF) 21, a power amplifier (PA) 22, a mixer 23, and a transmission decoder 24 are sequentially connected in series between the matching circuit 13 and the CPU 5, and a carrier frequency of 13. A transducer 25 having a frequency of 56 MHz is connected to form a transmission system circuit.

  As shown in FIG. 6, the reader / writer module 1 is connected to the upper control unit 26 as indicated by an arrow, and then transmits a radio wave 27 under the control of the upper control unit 26. The wireless IC tag (TAG) 35 receives the radio wave 27 and generates an electromotive force. Then, it operates by this electromotive force and transmits predetermined data as a radio wave 28 from the loop antenna 3.

  The reader / writer module 1 receives the radio wave 28 with the loop antenna 3. A signal included in the received radio wave 28 is processed by a reception system circuit and sent to the CPU 5 as reception data. The CPU 5 processes this received data under the control of the upper control unit 26 shown in FIG. As a result of reading the data of the wireless IC tag 35, the apparatus in which the reader / writer module 1 is set is controlled based on the result. For example, the gate is opened and closed. Further, based on information from the wireless IC tag 35, new data is sent to the wireless IC tag 35 to write information.

  In this series of operations, when the wireless IC tag 35 reacts to the communication of the reader / writer 1 and the reader / writer 1 can confirm the reception of the reply, the CPU 5 turns on the LED 15 provided in the reader / writer 1. When the wireless IC tag 35 does not react and the reader / writer 1 cannot receive the reply, the CPU 5 turns off the LED 15.

  The reader / writer module 1 according to the first embodiment has a loop antenna 3 on the second surface 2b of the wiring board 2, and various electronic components 9 are mounted on the first surface 2a to form the circuit shown in FIG. ing. As the electronic component 9, in addition to the CPU 5, the transmission / reception unit 11, the serial port 14, and the light emitting diode (LED) 15, a capacitor element, a resistance element, an inductor, and the like are mounted although not described with reference numerals. In addition, a connector 29 and the like connected to the upper control unit 26 are also arranged on the peripheral portion of the wiring board 2.

  On the other hand, this is one of the features of the present invention. As shown in FIGS. 1 and 3, the electromagnetic shield 10 is bonded and fixed to the second surface 2 b of the wiring board 2. The electromagnetic shield 10 has a quadrangular shape. For example, as shown in FIGS. 4A and 4B, a film 51 having an insulating adhesive layer 52 on the first surface 51 a and the first surface of the film 51. And a conductor layer 53 formed on the second surface 51b which is the opposite surface. The electromagnetic shield 10 is bonded via an adhesive layer 52 to the opposite surface (second surface 2b) of the wiring board 2 on which the electronic component 9 constituting the control part of the communication circuit of the reader / writer module 1 is mounted. ing. As shown in FIG. 3, the electromagnetic shield 10 has a size including a mounting area of a CPU 5 that is an electronic component 9 constituting a control part of a communication circuit of the reader / writer module 1.

  Thus, even if an electric current flows into the loop antenna 3, the electromagnetic shielding body 10 exists even if an electric current flows into the loop antenna 3 by providing the electromagnetic shielding body 10 in the area | region corresponding to the mounting area | region of CPU5 which is an electronic component which comprises the control part of a circuit for communication. The portion absorbs the magnetic field and no longer generates a magnetic field. As a result, even if the reader / writer module operates and an electric field is generated by the loop antenna, the electric field disappears in the portion where the electromagnetic shield is disposed. Does not work, and the reader / writer module operates stably.

  An example of the output of the reader / writer module 1 provided with the electromagnetic shield 10 is shown in the graph of FIG. What is shown after pasting the graph of FIG. 7 is according to the present invention. In the reader / writer module 1 of sample number 480, which is regarded as a defective product, when the electromagnetic shield 10 is bonded to the wiring board 2, it becomes about 3.7 dBm, compared with about 5.8 dBm before the electromagnetic shield 10 is attached. It was about 2.1 dBm lower. Further, in the reader / writer module 1 of sample number 567, which is regarded as a non-defective product, when the electromagnetic shield 10 is bonded to the wiring board 2, it becomes about 0.8 dBm, compared with about 3.7 dBm before the electromagnetic shield 10 is attached. It was as low as about 2.9 dBm.

  Further, according to experiments, the output distribution boundary of the non-defective product / defective product of the reader / writer module 1 is around 5.0 dBm, and a module with an output exceeding 5.0 dBm when VCC = 5.0 V has a high probability of malfunction. It turns out.

  The film 51 constituting the electromagnetic shield 10 is formed of an insulating resin. For example, the film 51 is formed of an insulating resin with an adhesive layer 52 having a thickness of about 20 μm, and the conductor layer 53 is formed of an aluminum foil having a thickness of 40 to 50 μm with an adhesive. The total thickness of the electromagnetic shield 10 is, for example, about 50 to 75 μm. The electromagnetic shield 10 may have a label configuration in which a product number or the like is printed on the surface of the conductor layer 53.

Example 1 has the following effects.
(1) In the reader / writer module 1, an electromagnetic shield 10 made of a conductive material is bonded to the wiring board 2 so as to correspond to a predetermined area including an electronic component (CPU 5) that constitutes a control part of a communication circuit. Yes. Therefore, even if the reader / writer module 1 is operated and an electric field is generated by the loop antenna 3, the electric field disappears in the portion where the electromagnetic shield 10 is disposed. Therefore, the electronic components ( The magnetic field does not act on the CPU 5), and the reader / writer module 1 operates stably without an abnormally high output.

FIG. 8 is a schematic diagram showing an inner layer portion of a wiring board in a reader / writer module that is Embodiment 2 of the present invention.
The reader / writer module 1 according to the second embodiment is the same as the reader / writer module 1 according to the first embodiment, in which the electromagnetic shield 10 is disposed on the inner layer of the wiring board 2. The wiring board 2 has a multilayer wiring structure. Therefore, when the wiring board 2 is formed, the electromagnetic shield 10 is formed in one of the two layers inside the wiring board 2 as shown in FIG. The electromagnetic shield 10 is formed at the same time as the conductor layer when forming the wiring. In FIG. 8, the CPU 5 is schematically shown so that the relationship between the mounting position of the CPU 5 that is the electronic component 9 constituting the control part of the communication circuit and the electromagnetic shield 10 can be understood.

  In the case of the second embodiment, similarly to the case of the first embodiment, the electromagnetic shield 10 made of a conductive material is wired corresponding to a predetermined region including the electronic component (CPU 5) constituting the control part of the communication circuit. Bonded to the substrate 2. Therefore, even if the reader / writer module 1 is operated and an electric field is generated by the loop antenna 3, the electric field disappears in the portion where the electromagnetic shield 10 is disposed. Therefore, the electronic components ( The magnetic field does not act on the CPU 5), and the reader / writer module 1 operates stably without an abnormally high output.

FIG. 9 is a schematic diagram showing an inner layer portion of a wiring board in a reader / writer module that is Embodiment 3 of the present invention.
In the reader / writer module 1 of the third embodiment, the electromagnetic shield 10 is disposed on the inner layer of the wiring board 2 in the same manner as the reader / writer module 1 of the second embodiment. The wiring board 2 has a multilayer wiring structure as described above. Therefore, when the wiring board 2 is formed, the electromagnetic shield 10 is formed in the wiring pattern of one of the two layers inside the wiring board 2 as shown in FIG. The electromagnetic shield 10 is formed at the same time as the conductor layer when forming the wiring. In the third embodiment, the electromagnetic shield 10 is configured to be electrically connected to the wiring formed on the other surface by the conductor 61 provided in the through hole 60. That is, the electromagnetic shield 10 is electrically connected to a wiring that is set to the ground or the power supply potential. When connected to the ground or the power supply potential, the area of each potential can be increased, and an effect of characteristic stabilization can be expected.

  In FIG. 9, the CPU 5 is schematically shown so that the relationship between the mounting position of the CPU 5 that is the electronic component 9 constituting the control part of the communication circuit and the electromagnetic shield 10 can be understood.

  In the case of the third embodiment, similarly to the case of the first embodiment, the electromagnetic shield 10 made of a conductive material is wired corresponding to a predetermined region including the electronic component (CPU 5) constituting the control part of the communication circuit. Bonded to the substrate 2. Therefore, even if the reader / writer module 1 is operated and an electric field is generated by the loop antenna 3, the electric field disappears in the portion where the electromagnetic shield 10 is disposed. Therefore, the electronic components ( The magnetic field does not act on the CPU 5), and the reader / writer module 1 operates stably without an abnormally high output.

  Although the invention made by the present inventor has been specifically described based on the embodiment, the present invention is not limited to the embodiment described above, and various modifications can be made without departing from the scope of the invention. Nor. In the embodiment, the example in which the CPU is arranged in the area inside the loop antenna has been described. However, the present invention can also be applied to a structure in which the CPU is arranged close to the outer periphery of the loop antenna. In this case, the reader / writer module can be stably operated by disposing the electromagnetic shield at a position corresponding to the outer peripheral portion of the loop antenna.

1 is a front view of a reader / writer module that is Embodiment 1 of the present invention. FIG. It is a top view of the reader / writer module. It is a bottom view of the reader / writer module. It is a schematic diagram which shows the electromagnetic shielding body adhere | attached on the said reader / writer module. It is a block diagram which shows the function structure of the said reader / writer module. It is a schematic diagram which shows the usage condition of the said reader / writer module. It is a graph which shows the difference in the output of the quality goods and inferior goods in the reader-writer module of Example 1, and the reader-writer module examined prior to this invention. It is a schematic diagram which shows the inner layer part of the wiring board in the reader / writer module which is Example 2 of this invention. It is a schematic diagram which shows the inner layer part of the wiring board in the reader / writer module which is Example 3 of this invention. It is a schematic diagram which shows the outline | summary of the testing apparatus used in the characteristic improvement of the reader / writer module prior to this invention, and examination of stable operation | movement. It is a schematic diagram which shows the arrangement | positioning state with the loop antenna in the experiment conducted by examination of the said characteristic improvement and stable operation | movement, and the electronic circuit controlled by a computer, and the state of the magnetic field generated by a loop antenna. It is a schematic diagram which shows the arrangement | positioning state with the loop antenna in the reader / writer module prior to this invention, the computer, and the electronic circuit controlled by the computer, and the state of the magnetic field generated by the loop antenna.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Reader / writer, 2 ... Wiring board, 3 ... Loop antenna, 4 ... Transmission and reception circuit (RF), 5 ... Computer (CPU), 6 ... Cable, 7 ... Magnetic field (magnetic flux), 9 ... Electronic component, 10 DESCRIPTION OF SYMBOLS ... Electromagnetic shield, 11 ... Transmission / reception part, 12 ... Tuning circuit, 13 ... Matching circuit, 14 ... Serial port, 15 ... Light emitting diode (LED), 17 ... Rectifier, 18 ... Filter (BPF), 19 ... Power amplifier (PA) ), 20 ... reception decoder, 21 ... filter (LPF), 22 ... power amplifier (PA), 23 ... mixer, 24 ... transmission decoder, 25 ... transducer, 26 ... upper control unit, 27, 28 ... radio wave, 29 ... Connector, 35 ... Wireless IC tag (TAG), 37, 38 ... Wiring board, 40 ... Test device, 41 ... Table, 42 ... Reader / writer fixing jig, 43 ... Acceptable Mold support jig 44 ... support platform, 45 ... mounting plate, 51 ... film, 52 ... adhesive layer, 53 ... conductive layer 60 ... through hole, 61 ... conductor.

Claims (5)

A wiring board having a predetermined wiring in a predetermined portion;
A loop-shaped antenna formed on one surface of the wiring board and connected to the wiring;
A plurality of electronic components mounted on the wiring board;
An electronic device in which a predetermined communication circuit is formed by the wiring of the wiring board and the plurality of electronic components,
An electronic apparatus comprising: an electromagnetic shield made of a conductive material corresponding to a predetermined region including the electronic component constituting the control part of the communication circuit; The electromagnetic shield comprises a film having an insulating adhesive layer on a first surface, and a conductor layer formed on a second surface opposite to the first surface of the film,
The said electromagnetic shielding body is adhere | attached through the said adhesion layer on the opposite surface of the said wiring board surface in which the said electronic component which comprises the control part of the said circuit for communication is mounted. Electronic devices. The wiring board is a multilayer wiring board in which a plurality of insulating layers are stacked,
2. The electromagnetic shield is formed of a material that forms the wiring between the insulating layer and the insulating layer of the multilayer wiring board without being connected to the wiring. An electronic device according to 1. The wiring board is a multilayer wiring board in which a plurality of insulating layers are stacked,
The said electromagnetic shielding body is the material which forms the said wiring between the said insulating layers and the said insulating layer of the said multilayer wiring board, and is formed connected to the said wiring. Electronic devices. The electronic device is a reader / writer module capable of sending a radio wave to a wireless IC tag, receiving a radio wave from the wireless IC tag, reading information on the wireless IC tag, or writing information to the wireless IC tag. The electronic device according to claim 1, characterized in that:

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