JP4605504B2 - Electronic circuit protection structure and method for non-contact communication device and folding cellular phone - Google Patents

Description

  The present invention relates to a non-contact communication apparatus including an RFID tag, an RFID reader / writer, and the like. In particular, the present invention relates to a structure and method for protecting an electronic circuit in a contactless communication device, and a folding mobile phone.

FIG. 10 is a diagram showing a non-contact communication apparatus as a premise of the present invention. This figure (a) is a perspective view which shows the general | schematic outline of a non-contact communication apparatus, This figure (b) is the cross section about line AA which shows the schematic structure of the non-contact communication apparatus of this figure (a). FIG. Note that the same components are denoted by the same reference numerals and symbols throughout the drawings.
The non-contact communication apparatus 200 shown in FIG. 6A has a function of an RFID (Radio Frequency Identification) tag that sets unique identification data in advance for an object to be identified, and an RFID reader / writer that reads and writes the RFID tag. Hereinafter, the non-contact communication apparatus 200 will be described as an example.

As shown in FIG. 2B, the non-contact communication device 200 is a device that reads and writes RFID such as a non-contact IC card (not shown) wirelessly as an electromagnetic wave 400, and surrounds the outer periphery of the non-contact communication device 200. At least the wireless antenna unit 101, the electronic circuit board 102, the operation or backup battery pack 203, and the shield material 204 are provided inside the case.
The shield material 204 faces the surface of the wireless antenna unit 101 and is disposed between the wireless antenna unit 101 and the electronic circuit board 102.

The wireless antenna unit 101 has a function of transmitting / receiving operating power and commands for reading / writing an external non-contact IC card (not shown), and transmitting / receiving data.
The electronic circuit board 102 has a function of operating the RFID circuit 106 shown in FIG.

The battery pack 203 for operation or backup is a battery pack in which a case surrounding the outer periphery is formed of a conductive metal, and supplies power to the electronic circuit board 102 and the wireless antenna unit 101 for operation or backup. In addition, it has a function of charging with the operating power received from the wireless antenna unit 101.
The shield material 204 is mainly formed of a conductive metal material, and is provided between the wireless antenna unit 101 and the electronic circuit board 102, and blocks the electromagnetic wave 400 transmitted and received from the wireless antenna unit 101 in order to read and write information of the RFID tag. Then, the electromagnetic induction phenomenon is prevented from occurring in the wiring and ground pattern in the electronic circuit board 102 other than the wireless antenna unit 101, the electronic circuit board 102 is protected, and malfunction is prevented.

By the way, in the non-contact communication apparatus 200 which is a premise of the present invention, the shielding material 204 is omitted, and the electromagnetic wave 400 transmitted / received by the wireless antenna unit 101 is blocked by the operation or backup battery pack 203 instead of the shielding material 204. There is a problem in that it is desired to protect the electronic circuit board 102, contribute to the reduction of the number of components and the weight of the apparatus, and not to sacrifice the portability.
The prior arts related to the non-contact communication apparatus which is the premise of the present invention include the following.

  Conventionally, in a mobile information communication body such as an IC card equipped with an antenna for wireless communication with a non-contact communication device such as a reader / writer device, the resonance point of the antenna changes due to proximity to an object or the like, thereby making non-contact communication. In order to prevent the efficiency of wireless communication between the apparatus and the mobile information communication body from decreasing, for example, in an IC card equipped with an antenna, the antenna is made of a material having a dielectric constant close to that of air. A cover is provided, and for example, the cover that is attached to a mobile information communication body including an antenna for wireless communication with a non-contact communication device and covers the antenna is made of a material having a dielectric constant close to that of air. (For example, refer to Patent Document 1).

  Also, conventionally, to provide an apparatus, method, and system that allows RFID to be used at a distance of about 12 inches or more for a handheld mobile computer while maintaining ergonomic accuracy. In mobile computers and readers that can be configured as standard module attachments (eg, sleds) for computers that can only be used when frequency identification (RFID) queries are desired, the sleds incorporate RFID reader electronics. Some antenna loops can support a dedicated battery separated from an actual mobile computer (see, for example, Patent Document 2).

  Conventionally, the metal case has a door that can be opened and closed and an electromagnetic wave absorber is attached to the inside in order to improve the security level of the system by making the ID tag unreadable without affecting the human body. In the metal case, an interrogator, an antenna and a high-power oscillator are installed in advance, and an ID tag to be discarded is stored at a predetermined position. The output side of the interrogator and the high-power oscillator is connected via a switching device. Connected to the antenna, the interrogator, the high-power oscillator and the switch operate according to the control command from the external processing device, the high-power oscillator oscillates according to the command from the external processing device, and the ID tag cannot be operated. The switcher operates in response to a command from an external processing device, selects the output of the interrogator or high-power oscillator, and outputs the antenna. There is to be output (for example, see Patent Document 3).

  However, although the RFID tag is disclosed in the above Patent Documents 1-3, the shield material 204 is omitted as in the RFID tag 100 which is a premise of the present invention, and the operation material or the backup material is used instead of the shield material 204. A solution to the problem of protecting the electronic circuit board 102 by blocking the electromagnetic wave 400 transmitted and received by the wireless antenna unit 101 in the battery pack 203 is not disclosed.

  Conventionally, in order to reduce the influence of external noise with structural features on the microcomputer built in the battery pack, the battery pack has a plurality of cylindrical batteries, and these cylindrical batteries constitute an assembled battery. The battery pack includes a PBA having a solid pattern of ground potential, and a microcomputer is mounted near the end of the PBA on the assembled battery side. Is placed adjacent to the bottom surface of the negative electrode of the cylindrical battery, and the bottom surface of the negative electrode is connected to a solid pattern of ground potential. (For example, refer to Patent Document 4).

  However, in the above-mentioned Patent Document 4, in order to prevent EMI noise radiated from the electronic circuit to the outside and from the outside to the electronic circuit, the negative electrode of the battery is grounded to the ground, and the vicinity of the microcomputer that is most susceptible to radiation Although a technique for reducing the EMI noise by strengthening the ground potential of the circuit board by disposing the shield material 204 is omitted, the shield material 204 is omitted and the shield is omitted as in the non-contact communication device 200 which is the premise of the present invention. Disclosed is a solution to the problem of protecting the electronic circuit board 102 by blocking the electromagnetic wave 400 transmitted / received by the wireless antenna unit 101 by the battery pack 203 for operation or backup instead of the material 204, that is, EMI noise from the outside itself from the circuit board. Not.

JP 2001-102838 A JP 2003-196617 A JP 2003-308495 A JP 2000-277071 A

  Therefore, in view of the above problems, the present invention omits the shielding material 204 and replaces the shielding material 204 with an operation or backup battery pack 203 while blocking the electromagnetic wave 400 transmitted / received by the wireless antenna unit 101 and the electronic circuit board 102. It is an object of the present invention to provide an electronic circuit protection structure and method for a non-contact communication device that wants to contribute to the reduction of the number of components and the weight of the device.

In order to solve the above problems, the present invention provides an electronic circuit protection structure for a non-contact communication device, including an antenna coil that performs transmission and reception with the outside, and a wireless antenna unit that includes an RFID circuit that performs wireless communication via the antenna coil; The radio antenna unit is disposed to face the antenna coil surface, and is connected to the RFID circuit of the radio antenna unit, and each electronic device operates via the wiring of the contactless communication device and the RFID circuit. An electronic circuit other than the wireless antenna unit, and a battery pack for operation or backup of the non-contact communication device in which a case surrounding the outer periphery is formed of a conductive metal, the battery pack for operation or backup The electromagnetic wave transmitted and received by the antenna coil of the wireless antenna unit is blocked from the electronic circuit. To provide an electronic circuit protection structure of the non-contact communication device sandwiched characterized in that it is arranged between the antenna coil of the wireless antenna portion and the electronic circuit.

Further, when the case surrounding the outer periphery of the operating or backup battery pack is formed of a nonconductive material including plastic instead of a conductive metal, a non-electromagnetic inductive power storage material is enclosed in the case. The
Further, even when a case surrounding the outer periphery of the operation or backup battery pack is formed of a conductive metal, a non-electromagnetic inductive power storage material is enclosed in the case.
Further, the ground pattern wired to the case surrounding the outer periphery of the electronic circuit and the conductive metal case of the operation or backup battery pack are connected to ensure the stability of the ground.

Further, the wireless antenna unit is arranged outside a case surrounding the electronic circuit and the operation or backup battery pack, and the case and the operation or backup are interposed between the wireless antenna unit and the electronic circuit. Hold the battery pack.
Further, when the case surrounding the electronic circuit and the battery pack for operation or backup is made of conductive metal, and the case has an opening, the battery pack for operation or backup is closed so as to close the opening. Place.

Furthermore, the size of the battery pack for operation or backup is formed larger than that of the radio antenna unit according to the size, transmission range, and strength of the radio antenna unit.
Further, the wireless antenna unit is arranged outside a case surrounding the electronic circuit and the operation or backup battery pack, and the case and the operation or backup are interposed between the wireless antenna unit and the electronic circuit. The size of the battery pack for operation or backup is formed larger than the size of the wireless antenna unit with the battery pack interposed therebetween.

Furthermore, the non-contact communication device is an RFID tag in which unique identification data is set in advance for an object to be identified.
Further, the non-contact communication device is an RFID reader / writer that reads and writes an RFID tag in which unique identification data is set in advance for an object to be identified.
Furthermore, the non-contact communication device is a device in which unique identification data is set in advance for an object to be identified, and performs close proximity wireless communication.
Further, the RFID tag includes a non-contact IC card.
Further, instead of the battery pack for operation or backup, a hard disk unit having a metal disk is opposed to the surface of the wireless antenna unit, and is sandwiched between the electronic circuit and the wireless antenna.

Further, when the non-contact communication device is a folding mobile phone that folds two housings, the wireless antenna unit is provided outside one of the housings, and a liquid crystal display device is provided inside one of the housings. The liquid crystal of the liquid crystal display device is disposed between the wireless antenna unit and the electronic circuit when the electronic circuit is provided on the other side of the casing and the folded mobile phone is folded. Electromagnetic waves transmitted and received by the antenna coil of the wireless antenna unit instead of the battery pack for operation or backup are cut off by the discrete and absorption of electromagnetic waves to the electrode formed in the part and the structure containing liquid having liquid crystal characteristics. To do.

Furthermore, the present invention relates to a method for protecting an electronic circuit of a non-contact communication device, a step of forming a case surrounding the outer periphery of the battery pack for operation of the non-contact communication device or a backup battery, and external transmission / reception. Operation of the non-contact communication apparatus connected to the RFID circuit of the wireless antenna unit opposite to the surface of the antenna coil of a wireless antenna unit having an antenna coil and an RFID circuit that performs wireless communication via the antenna coil And the operation or backup battery pack is disposed between the wireless antenna unit and an electronic circuit other than the wireless antenna unit that operates the RFID circuit, and the antenna of the wireless antenna unit is disposed with respect to the electronic circuit. And a step of blocking electromagnetic waves transmitted and received by the coil for use in a non-contact communication device. To provide a circuit protection method.

As described above, according to the present invention, when operating power is received from the outside to the non-contact communication device, electromagnetic waves generated in the wireless antenna unit when the identification data is transmitted from the non-contact communication device to the outside are used for operation or The metal case of the backup battery pack and the non-electromagnetic inductive material inside the battery pack are cut off, and noise due to the electromagnetic induction phenomenon occurring in the wiring of the electronic circuit and the ground pattern is prevented.
That is, for electromagnetic waves transmitted and received by the wireless antenna, the electromagnetic waves are blocked and converged by the operation or backup battery pack, and the electronic circuit is not affected by the electromagnetic induction phenomenon, so the conventional shielding material can be omitted. It becomes possible to contribute to reduction of the number of parts of the non-contact communication device and reduction of the weight of the device.

Furthermore, the ground pattern of the electronic circuit case and the case of the battery pack for operation or backup are connected, so that the ground of the electronic circuit is very stable, and the influence of electromagnetic waves on the ground pattern of the electronic circuit case is somewhat Even if it exists, the stability of the ground can be ensured.
Furthermore, for a mobile phone having a non-contact communication device, the liquid crystal display device serves as a kind of shield because the liquid crystal display device is arranged so that the liquid crystal display device is between the wireless antenna portion and the electronic circuit. Therefore, it is possible to avoid the influence of electromagnetic waves on the electronic circuit without providing a dedicated shield.
Further, in place of the operation or backup battery pack, a hard disk unit having a metal disk is opposed to the surface of the wireless antenna unit, and the same action is provided by being sandwiched between the electronic circuit and the wireless antenna. An effect can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a sectional view showing a schematic structure of a non-contact communication apparatus according to the present invention. As shown in this figure, compared to FIG. 10, the surface of the wireless antenna unit 101 and the surface of the battery pack 103 for operation or backup are opposed to each other inside the case surrounding the outside of the non-contact communication device 100. Thus, the operation or backup battery pack 103 is interposed between the wireless antenna unit 101 and the electronic circuit board 102.

The shielding material 204 shown in FIG. 10 is omitted, and instead of the shielding material 204, the battery pack 103 for operation or backup has a battery function, and at the same time shields the electromagnetic wave 400 transmitted and received by the wireless antenna unit 101, converges, and electronically The circuit board 102 is protected.
FIG. 2 is a diagram showing a schematic structure of the wireless antenna unit 101 in FIG. As shown in this figure, an antenna coil 105 and an RFID circuit 106 connected to the antenna coil 105 are formed in the wireless antenna unit 101.

The antenna coil 105 is generally a multilayered loop wiring.
The RFID circuit 106 is a circuit for performing wireless communication via the antenna coil 105.
In communication using the RFID circuit 106, unique ID information and information according to a predetermined operation are transmitted and received, and various processes can be performed by a program.

As for the operating power of the RFID circuit 106, an electromotive force is obtained by the electromagnetic induction phenomenon by radio transmitted to the antenna coil 105, and the RFID circuit 106 is operated using the power, and the external power shown in FIG. Operating power is supplied to the RFID circuit 106 from the operating or backup battery pack 103.
Further, the RFID circuit 106 mutually emphasizes the circuit mounted on the electronic circuit board 102 shown in FIG.

FIG. 3 is a sectional view showing a schematic structure of the electronic circuit board 102 in FIG. As shown in the figure, electronic devices 108, 109, etc. are provided on the electronic circuit board 102, and the electronic devices 108, 109, etc. are connected to a bus 110 via wirings 111, 112, respectively. 110 is connected to the RFID circuit 106 of the wireless antenna unit 101.
Electronic devices 108, 109, etc. are mounted on the electronic circuit board 102. The electronic devices 108, 109 hold identification data, and perform a demodulation process of received signals, a modulation process of transmission data, etc. It is formed.

Note that a ground pattern indicated by a hatched portion is generally wired in a loop shape in the outer peripheral case surrounding the electronic circuit board 102, and a half-loop pattern is also used for wiring connecting the electronic devices 108 and 109. There are many.
4 is a cross-sectional view showing a schematic structure of the operation or backup battery pack 103 in FIG. As shown in this figure, a case made of a conductive metal indicated by a hatched portion is provided on the outer peripheral portion surrounding the battery pack 103 for operation or backup.

When the case of the battery pack 103 for operation or backup is made of plastic, a non-electromagnetic inductive power storage material 107 is sealed inside the case.
Even when the case of the battery pack 103 for operation or backup is made of a conductive metal, the non-electromagnetic inductive power storage material 107 may be sealed inside the case.

Basically, the battery pack 103 for operation or backup is a custom-made battery covered with a metal case, but it may also be a normal commercially available dry cell.
Therefore, the electromagnetic wave 400 transmitted / received by the antenna coil 105 of the wireless antenna unit 101 at the time of receiving the non-contact communication device 100 from the outside and transmitting the identification data from the non-contact communication device 100 to the outside is the battery pack 103 for operation or backup. The conductive metal case or the non-electromagnetic inductive material inside the case is cut off, and the electromagnetic induction phenomenon occurs in the wiring and ground pattern composed of the bus 110 and the wirings 111 and 112 of the electronic circuit board 102. This prevents the malfunction caused by noise.

  That is, the electromagnetic wave 400 transmitted and received by the antenna coil 105 of the wireless antenna unit 101 is blocked by the operation or backup battery pack 103 and the electronic circuit board 102 is not affected by the electromagnetic induction phenomenon. Therefore, the shield material 104 in FIG. 10 can be omitted, and the number of components and the weight of the non-contact communication device 100 can be reduced.

  Further, in FIG. 1, the ground pattern of the case of the electronic circuit board 102 and the case of the battery pack 103 for operation or backup are connected. As a result, the ground of the electronic circuit board 102 is very stable, and the ground can be stabilized even if the ground pattern of the case of the electronic circuit board 102 is slightly affected by the electromagnetic wave 400.

FIG. 5 is a cross-sectional view showing a schematic structure according to a first modification in FIG. As shown in the figure, in the non-contact communication apparatus 100, a wireless antenna unit 101 is disposed outside a case surrounding the electronic circuit board 102 and the battery pack 103 for operation or backup, and the wireless antenna unit 101, the electronic circuit 102, Between the case and the battery pack 103 for operation or backup.
Even in such a form, the shield material 204 in FIG. 10 can be omitted as described above.

  Preferably, the case surrounding the electronic circuit board 102 and the battery pack 103 for operation or backup may be formed of a conductive material, or the inside of the case may be plated with a conductive material. In this case, when the case has an opening, the electromagnetic wave 400 is completely shielded by disposing the operation or backup battery pack 103 so as to close the opening. In other words, the case cannot be completely sealed due to the presence of an opening for the wireless antenna unit 101 to go outside the case and an opening for a display device (not displayed). Even if it is difficult to shield from the electromagnetic wave 400, only the important part can be protected by the battery pack 103 for operation or backup.

  By such a device, the electronic circuit board 102 can be protected against the electromagnetic wave 400 from the antenna coil 105 of the wireless antenna unit 101, and the shielding material 204 in FIG. This can contribute to the reduction of the number of parts and the weight of the non-contact communication apparatus 100.

FIG. 6 is a cross-sectional view showing a schematic structure according to a second modification in FIG. As shown in the figure, the size of the battery pack 103 for operation or backup is formed larger than the size of the wireless antenna unit 101 as compared with FIG. Thereby, the shielding of the electromagnetic wave 400 to the electronic circuit board 102 is further increased against the passage of the outer periphery of the battery pack 103 for operation or backup.
Note that, due to the ground potential portion of the operation or backup battery pack 103, part of the electromagnetic wave 400 that attempts to pass through the outer periphery of the operation or backup battery pack 103 also converges on the operation or backup battery pack 103. Therefore, each size may be determined according to the intensity of the electromagnetic wave 400, the radiation range, and the like.

FIG. 7 is a sectional view showing a schematic structure according to a third modification in FIG. As shown in this figure, the size of the battery pack 103 for operation or backup is formed larger than the size of the wireless antenna unit 101 as compared with FIG. Thereby, the shielding of the electromagnetic wave 400 to the electronic circuit board 102 is further increased against the passage of the outer periphery of the battery pack 103 for operation or backup.
Note that, due to the ground potential portion of the operation or backup battery pack 103, part of the electromagnetic wave 400 that attempts to pass through the outer periphery of the operation or backup battery pack 103 also converges on the operation or backup battery pack 103. Therefore, each size may be determined according to the intensity of the electromagnetic wave 400, the radiation range, and the like.

  Furthermore, the RFID tags 100 that are non-contact communication devices may perform near-field wireless communication, but the present invention can also be applied to such non-contact communication devices.

  FIG. 8 is a cross-sectional view showing a schematic structure according to a fourth modification in FIG. FIG. 8A shows a non-contact communication apparatus 200 that is a premise of the present invention. Compared to FIG. 10B, the non-contact communication apparatus 200 may be provided with a hard disk unit 205 in some cases. The hard disk unit 205 is a storage unit, has a disk that rotates at high speed, and an aluminum alloy metal is used as a material of the disk.

As shown in FIG. 8B, in the non-contact communication apparatus 100 of the present invention, the hard disk unit 115 has a function as a storage unit, and at the same time, is used in place of the shield material 204 of FIG. 8A.
In other words, the electromagnetic wave 400 transmitted and received by the antenna coil 115 of the wireless antenna unit 101 is blocked by the heart disk unit 205 and is not affected by the electromagnetic induction phenomenon in the electronic circuit board 102. The shield material 104 of 8 (a) can be omitted, and the number of parts of the non-contact communication device 100 can be reduced and the weight can be reduced.

FIG. 9 is a sectional view showing an electronic circuit protection structure of a folding cellular phone having a non-contact communication device according to another embodiment of the present invention.
The folding cellular phone 301 shown in this figure has a non-contact communication device. The folding cellular phone 301 is provided with a casing 310 and a casing 320. The casing 310 and the casing 320 are indicated by a dotted line by a hinge structure (not shown). Open and close as shown.

Here, the casing 310 and the casing 320 are generally made of metal and are often conductors. However, a non-conductor such as carbon is used for weight reduction, and an opening for providing an input unit 321 described later is used. And is relatively defenseless against the electromagnetic wave 400.
A liquid crystal display device 311 is provided inside the housing 310, and an input unit 321 is provided inside the housing 320.

Here, the liquid crystal display device 311 has electrodes formed on a general glass substrate or plastic substrate, and a liquid having liquid crystal properties is sealed in the substrate, and is generally fixed with a metal structure in order to maintain strength. Has been.
A wireless antenna unit 312 of a non-contact communication device is provided outside the housing 310, and an electronic circuit board 331 is provided outside the housing 320.

Here, the electronic circuit board 331 controls the folding cellular phone 301 including the input unit 321 and the liquid crystal display device 311.
The electronic circuit board 331 includes an electronic circuit board of a non-contact communication device.
The wireless antenna unit 312 of the non-contact communication apparatus has the same structure as the wireless antenna unit 101 shown in FIG.

When the folded cellular phone is closed, the liquid crystal display device 311 is disposed between the wireless antenna unit 312 of the non-contact communication device and the electronic circuit board 331 to be protected.
When the non-contact communication device performs non-contact communication with the folded mobile phone closed, the wireless antenna unit 312 built in the housing 310 transmits and receives the electromagnetic wave 400 to and from the outside.
In this case, the electromagnetic wave 400 that has passed through the wireless antenna unit 312 is discretely absorbed by the electrodes formed in the liquid crystal portion of the liquid crystal display device 311, the liquid having liquid crystal characteristics, and the metal structure.

Thereby, the electronic circuit board 331 built in the housing 320 can be prevented from being affected by the electromagnetic wave 400.
Therefore, according to the present invention, the wireless antenna unit 312 is arranged so that the liquid crystal display device 311 is located between the wireless antenna unit 312 and the electronic circuit board 331. Since the liquid crystal display device 311 serves as a kind of shield, the influence of the electromagnetic wave 400 on the electronic circuit board 331 can be avoided without providing a dedicated shield.

In addition, by providing a non-contact communication device in the mobile phone 301, it is not necessary to use a metal (conductor) material for shielding for the housing 310, the housing 320, and the input means 321, thereby reducing the weight. It becomes possible to maintain.
Note that when non-contact communication is performed in a state in which the folded mobile phone 301 is folded and closed, the display of the liquid crystal display device 311 is displayed when the liquid crystal display device 311 is operating due to the influence of the electromagnetic wave 400 absorbed by the electrodes of the liquid crystal display device 311 and the liquid crystal material. Although it may be affected by disturbance, the liquid crystal display device 311 is not in operation when the folded cellular phone 301 is closed, and thus is not affected by this.

  Although the folding cellular phone having the non-contact communication device has been described, the present invention is not limited to this, and the cellular phone can also be used for a folding PHS (simple cellular phone) and a folding PDA (portable information terminal).

It is sectional drawing which shows schematic structure of the non-contact communication apparatus which concerns on this invention. It is a figure which shows schematic structure of the radio | wireless antenna part 101 in FIG. It is sectional drawing which shows schematic structure of the electronic circuit board | substrate 102 in FIG. FIG. 2 is a cross-sectional view showing a schematic structure of an operation or backup battery pack 103 in FIG. 1. It is sectional drawing which shows schematic structure which concerns on the 1st modification in FIG. It is sectional drawing which shows schematic structure which concerns on the 2nd modification in FIG. It is sectional drawing which shows schematic structure which concerns on the 3rd modification in FIG. It is sectional drawing which shows schematic structure which concerns on the 4th modification in FIG. It is sectional drawing which shows the electronic circuit protection structure of the folding mobile telephone which has a non-contact communication apparatus in the other Example which concerns on this invention. It is a figure which shows the non-contact communication apparatus used as the premise of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 ... Non-contact communication apparatus 101 ... Wireless antenna part 102 ... Electronic circuit board 103, 203 ... Battery pack for operation or backup 105 ... Coil for antenna 106 ... RFID circuit 107 ... Power storage material 108, 109 ... Electronic device 110 ... Bus 111 , 112 ... wiring 115 ... hard disk unit 301 ... folding cellular phone 310, 320 ... casing 311 ... liquid crystal display device 312 ... wireless antenna unit 321 ... input means 331 ... electronic circuit board 400 ... electromagnetic wave

Claims (15)

In the electronic circuit protection structure of the non-contact communication device,
A wireless antenna unit having an antenna coil for transmitting and receiving with the outside and an RFID circuit for performing wireless communication via the antenna coil;
The radio antenna unit is disposed to face the antenna coil surface and is connected to the RFID circuit of the radio antenna unit, and each electronic device performs the operation of the non-contact communication device and the operation of the RFID circuit via wiring. An electronic circuit other than the wireless antenna unit to perform ;
A battery pack for operation or backup of the non-contact communication device in which a case surrounding the outer periphery is formed of a conductive metal;
The battery pack for operation or backup is provided between the antenna coil of the wireless antenna unit and the electronic circuit so as to block electromagnetic waves transmitted and received by the antenna coil of the wireless antenna unit to the electronic circuit. An electronic circuit protection structure for a non-contact communication device, wherein the electronic circuit protection structure is sandwiched between two . When the case surrounding the outer periphery of the battery pack for operation or backup is formed of a non-conductive material including plastic instead of a conductive metal, a non-electromagnetic inductive storage material is enclosed in the case. The electronic circuit protection structure for a non-contact communication device according to claim 1, wherein: The non-electromagnetic inductive power storage material is enclosed in the case even when the case surrounding the outer periphery of the battery pack for operation or backup is formed of a conductive metal. The electronic circuit protection structure of the non-contact communication apparatus described. The ground pattern wired to the case surrounding the outer periphery of the electronic circuit and the conductive metal case of the battery pack for operation or backup are connected to ensure the stability of the ground. Electronic circuit protection structure for non-contact communication devices. The wireless antenna portion is disposed outside a case surrounding the electronic circuit and the operation or backup battery pack, and the case and the operation or backup battery pack are disposed between the wireless antenna portion and the electronic circuit. The electronic circuit protection structure for a non-contact communication device according to claim 1, wherein: When the case surrounding the electronic circuit and the battery pack for operation or backup is made of conductive metal, and the case has an opening, the battery pack for operation or backup is disposed so as to close the opening. The electronic circuit protection structure for a non-contact communication device according to claim 5, wherein: The contactless communication according to claim 1, wherein the size of the operation or backup battery pack is formed larger than the size of the wireless antenna unit according to the size, transmission range, and strength of the wireless antenna unit. Device electronic circuit protection structure. The wireless antenna portion is disposed outside a case surrounding the electronic circuit and the operation or backup battery pack, and the case and the operation or backup battery pack are disposed between the wireless antenna portion and the electronic circuit. The electronic circuit protection structure for a non-contact communication device according to claim 1, wherein the size of the battery pack for operation or backup is formed larger than the size of the wireless antenna unit. The electronic circuit protection structure for a non-contact communication apparatus according to claim 1, wherein the non-contact communication apparatus is an RFID tag in which unique identification data is set in advance for an object to be identified. The non-contact communication apparatus according to claim 1, wherein the non-contact communication apparatus is an RFID reader / writer that reads and writes an RFID tag in which unique identification data is set in advance for an object to be identified. Electronic circuit protection structure. The non-contact communication apparatus according to claim 1, wherein the non-contact communication apparatus is an apparatus for which unique identification data is set in advance for an object to be identified and performs wireless communication between close proximity to each other. Circuit protection structure. 2. The electronic circuit protection structure for a non-contact communication apparatus according to claim 1, wherein the RFID tag includes a non-contact IC card. A hard disk unit having a metal disk instead of the operation or backup battery pack is opposed to the surface of the wireless antenna unit, and is sandwiched between the electronic circuit and the wireless antenna. Item 2. The electronic circuit protection structure for a non-contact communication device according to Item 1. When the non-contact communication device is a folding mobile phone that folds two housings, the wireless antenna unit is provided outside one of the housings, and a liquid crystal display device is provided inside one of the housings, The electronic circuit is provided on the other side of the casing, and when the folded mobile phone is folded, the liquid crystal portion of the liquid crystal display device is disposed between the wireless antenna unit and the electronic circuit. The electromagnetic wave transmitted and received by the antenna coil of the wireless antenna unit is cut off instead of the battery pack for operation or backup by the discrete and absorption of the electromagnetic wave to the formed electrode and the structure including liquid having liquid crystal characteristics. The electronic circuit protection structure for a non-contact communication device according to claim 1, wherein: In the electronic circuit protection method of the non-contact communication device,
Forming a case surrounding the outer periphery of the battery pack for operation or backup of the non-contact communication device, made of conductive metal;
An antenna coil that performs external transmission / reception and an RFID circuit that performs wireless communication via the antenna coil is opposed to a surface of the antenna coil facing the surface of the antenna coil, and is connected to the RFID circuit of the wireless antenna unit and is contactless The operation or backup battery pack is placed between the wireless antenna unit and the electronic circuit other than the wireless antenna unit that performs the operation of the communication device and the RFID circuit, and the wireless circuit unit is wirelessly connected to the electronic circuit. A method for protecting an electronic circuit of a non-contact communication device, comprising: a step of blocking electromagnetic waves transmitted and received by an antenna coil of an antenna unit .

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