JP2010130045A - Radio communication device, radio communication method and radio communication system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radio communication device, a radio communication method and a radio communication system capable of independently executing power transmission and data communication. <P>SOLUTION: In a reader-writer 110, electromagnetic coupling coils 111a, 111b and 111c are embedded corresponding to three faces forming a fitting part 110a. The coils each have polarization planes perpendicular to each other, i.e. polarization planes having no correlation of each other. In a memory 120, electromagnetic coupling coils 121a, 121b and 121c are embedded corresponding to the three planes opposing the three planes of the fitting part 110a of the reader-writer 110 while the coils are fitted to the fitting part 110a. The coils each have polarization planes perpendicular to each other, i.e. polarization planes having no correlation of each other. Power is transmitted from the reader-writer 110 to the memory 120 by an electromagnetic coupling system between the coils 111a and 121a. Data are transmitted by an electromagnetic coupling system between the coils 111b and 121b and an electromagnetic coupling system between the coils 111c and 121c. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a wireless communication device, a wireless communication method, and a wireless communication system. Specifically, the present invention performs power transmission from the second wireless communication device to the first wireless communication device using the first electromagnetic coupling system, and includes the second wireless communication device and the first wireless communication device. Wireless communication capable of performing power transmission and data communication independently by performing data communication using a second electromagnetic coupling system having polarization planes that do not correlate with each other. It relates to systems.

  In recent years, contents such as still images, moving images, and music have been increased in capacity. The user stores these contents in a built-in memory or a memory card in the portable device, and these contents are stored in a stationary device (reading device) such as a PC (Personal Computer), a television, or a printer as necessary. The style of moving is well established.

  When these contents are transferred to a reading device, they are generally connected by a wired cable such as a memory card slot or USB (Universal Serial Bus). However, the connection by the wired cable has a problem that the installation place is limited and the contact is worn and the shape is limited.

  As a result, wireless LAN systems such as IEEE802.11 and wireless communication systems such as Bluetooth (registered trademark), which are short-range wireless communication systems, are now available for mobile phones, personal digital assistants, digital cameras, and portable audio playback. It is being implemented in equipment. By implementing these wireless communication systems, usability as described above is improved.

  However, a memory card that has an external connection interface such as a wireless LAN is not so popular. This is because it is more disadvantageous to install a battery in a device such as a memory card that does not have an application other than the storage function to make it wireless.

For example, Patent Literature 1 and the like describe a data communication system using a non-contact communication method used for RFID (Radio Frequency IDentifier) and the like. Non-contact communication methods include an electrostatic coupling method, an electromagnetic induction method, a radio wave communication method, and the like. For example, an RFID system using a radio wave communication system includes a reflector that transmits data by a reflected wave obtained by modulating a received unmodulated carrier, and a reflected wave reader that reads data from a modulated reflected wave signal from the reflector. It is configured to perform reflected wave transmission, also called “backscatter”.
JP 2005-191705 A

  In the non-contact communication method described above, the RFID tag generally generates power using a carrier signal from a reading device. If information consisting of a comparatively short data series such as identification information is transmitted, it is possible to operate sufficiently with the power obtained from the carrier signal. However, it is not possible to cover the power required to transmit large-capacity content such as images and music data.

  Further, in the above-mentioned radio wave communication system RFID system, a reader / writer transmits an unmodulated carrier to a wireless tag, and the wireless tag reads a modulated reflected wave signal obtained by modulating the unmodulated carrier.・ Send to writer. Therefore, the wireless tag cannot transmit data spontaneously or actively.

  An object of the present invention is to enable power transmission and data communication to be performed independently.

The concept of this invention is
A wireless communication system comprising a first wireless communication device and a second wireless communication device,
The first wireless communication device includes:
A plurality of coils for electromagnetic coupling having polarization planes that are not correlated with each other;
Among the plurality of electromagnetic coupling coils, a power receiving unit that obtains power using an induced electromotive force generated in the first electromagnetic coupling coil;
Among the plurality of electromagnetic coupling coils, an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil is used to communicate with the second wireless communication device. A data communication unit for performing data communication between them,
A memory unit for storing data handled by the data communication unit;
The second wireless communication device is
A plurality of coils for electromagnetic coupling having polarization planes that are not correlated with each other;
Among the plurality of coils for electromagnetic coupling, a power feeding unit that sends a current for power transmission to the first coil for electromagnetic coupling;
Among the plurality of electromagnetic coupling coils, an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil is used to communicate with the first wireless communication device. A wireless communication system having a data communication unit for performing data communication between them.

  The first wireless communication device has a plurality of coils for electromagnetic coupling. The plurality of coils for electromagnetic coupling have polarization planes that are not correlated with each other. For example, the polarization planes of two electromagnetic coupling coils are set to differ by 90 to 270 degrees. The first wireless communication apparatus has a power receiving unit. In this power reception unit, power supply power is obtained using the induced electromotive force generated in the first electromagnetic coupling coil among the plurality of electromagnetic coupling coils. The first wireless communication apparatus may further include a power supply unit that obtains power supply power in addition to the power receiving unit described above. In this case, when the power supply unit is configured using, for example, a secondary battery, power consumption from the secondary battery can be suppressed due to the presence of the power receiving unit described above.

  Further, the first wireless communication apparatus has a data communication unit. In the data communication unit, the second wireless communication is performed by an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil among the plurality of electromagnetic coupling coils. Data communication is performed with the communication device. In this case, for example, data communication is performed using encoded data based on codes that are DC-free and clock-recoverable. By making it DC-free, data communication by electromagnetic coupling is favorably performed. In addition, since the clock can be reproduced, data transmission can be performed without sending a separate clock signal to the other party.

  Further, the first wireless communication apparatus has a memory unit. This memory unit holds data handled by the data communication unit. For example, data read from the memory unit is transmitted to the second wireless communication apparatus by the data communication unit. Further, for example, data received from the second wireless communication device by the wireless communication unit is stored in the memory unit. The memory unit may be configured such that a storage medium such as a memory card is detachably attached.

  The second wireless communication device has a plurality of coils for electromagnetic coupling. The plurality of electromagnetic coupling coils have polarization planes that are not correlated with each other, similarly to the plurality of electromagnetic coupling coils of the first wireless communication device described above. Further, the second wireless communication apparatus has a power feeding unit. In the power feeding unit, a current for power transmission is passed through the first electromagnetic coupling coil among the plurality of electromagnetic coupling coils.

  In addition, the second wireless communication apparatus has a data communication unit as in the first wireless communication apparatus described above. In the data communication unit, the first wireless communication is performed by an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil among the plurality of electromagnetic coupling coils. Data communication is performed with the communication device.

  In this way, power transmission is performed from the second wireless communication apparatus to the first wireless communication apparatus using the first electromagnetic coupling system. In addition, data communication is performed between the second wireless communication apparatus and the first wireless communication apparatus using the second electromagnetic coupling system having a polarization plane that is not correlated with the first electromagnetic coupling system. . Therefore, power transmission and data communication can be performed independently, and sufficient power can be supplied from the second wireless communication apparatus to the first wireless communication apparatus. In addition, data communication by an electromagnetic coupling system is performed between the first wireless communication device and the second wireless communication device, and power is supplied from the second wireless communication device to the first wireless communication device. It is also possible to transmit data spontaneously. In addition, since the first electromagnetic coupling coil and the second electromagnetic coupling coil have polarization planes that are not correlated with each other, interference of power transmission with respect to data communication is suppressed, and the first wireless communication Data communication between the device and the second wireless communication device can be performed satisfactorily.

  For example, in the first wireless communication device and the second wireless communication device, the second electromagnetic coupling coil includes a transmission coil and a reception coil, and the data communication unit is an external device using an electromagnetic coupling system using the transmission coil. The data may be transmitted to and received from an external device by an electromagnetic coupling system using a receiving coil. In this case, data transmission from the first wireless communication apparatus to the second wireless communication apparatus and data transmission from the second wireless communication apparatus to the first wireless communication apparatus can be performed simultaneously in parallel.

  In this case, for example, a common electromagnetic coupling coil is used as the transmission coil and the reception coil, and the transmission system circuit and the reception system circuit of the data communication unit are connected to the common electromagnetic coupling coil via the balun. May be. In this case, in the first wireless communication device and the second wireless communication device, an area for disposing the electromagnetic coupling coil can be saved, and the size of the device can be reduced.

  According to the present invention, power is transmitted from the second wireless communication apparatus to the first wireless communication apparatus using the first electromagnetic coupling system, and between the second wireless communication apparatus and the first wireless communication apparatus. The first electromagnetic coupling system performs data communication using the second electromagnetic coupling system having polarization planes that are not correlated with each other, and can perform power transmission and data communication independently. .

Hereinafter, the best mode for carrying out the invention (hereinafter referred to as “embodiment”) will be described. The description will be given in the following order.
1. Embodiment 2. FIG. Modified example

<1. Embodiment>
[External configuration example of wireless communication system]
FIG. 1 schematically shows an external appearance of a wireless communication system 100 as an embodiment. The wireless communication system 100 includes a reader / writer device 110 and a memory device 120. Each of the reader / writer device 110 and the memory device 120 constitutes a wireless communication device.

  The memory device 120 has a rectangular parallelepiped shape. The reader / writer device 110 is provided with a fitting portion 110 a made of a rectangular parallelepiped notch for fitting the memory device 120. When data communication is performed between the reader / writer device 110 and the memory device 120, the memory device 120 is fitted in the fitting portion 110a of the reader / writer device 110 as shown by a broken line. .

  In the reader / writer device 110, electromagnetic coupling coils 111a, 111b, and 111c are embedded corresponding to three surfaces constituting the fitting portion 110a. That is, the electromagnetic coupling coil 111a is embedded in the bottom surface of the fitting portion 110a, the electromagnetic coupling coil 111b is embedded in the first side surface of the fitting portion 110a, and the second side surface of the fitting portion 110a is embedded. An electromagnetic coupling coil 111c is embedded. In this case, the electromagnetic coupling coils 111a, 111b, and 111c have polarization planes orthogonal to each other, and thus polarization planes that are not correlated with each other.

  In addition, the memory device 120 is electromagnetically coupled to the three surfaces facing the three surfaces of the fitting portion 110a in the state of being fitted to the fitting portion 110a of the reader / writer device 110 described above. Coils 121a, 121b, and 121c are embedded. That is, the electromagnetic coupling coil 121 a is embedded in the bottom surface of the memory device 120, the electromagnetic coupling coil 121 b is embedded in the first side surface of the memory device 120, and the electromagnetic coupling coil 121 b is embedded in the second side surface of the memory device 120. A coil 121c is embedded. In this case, the electromagnetic coupling coils 121a, 121b, and 121c have polarization planes that are orthogonal to each other, and therefore have polarization planes that are not correlated with each other.

  When the memory device 120 is fitted in the fitting portion 110a of the reader / writer device 110, three electromagnetic coupling systems are configured. That is, the electromagnetic coupling coil 111a of the reader / writer device 110 and the electromagnetic coupling coil 121a of the memory device 120 are in a state in which their planes of polarization are opposed to each other, and constitute a first electromagnetic coupling system. In addition, the electromagnetic coupling coil 111b of the reader / writer device 110 and the electromagnetic coupling coil 121b of the memory device 120 are in a state where their polarization planes face each other, and constitute a second electromagnetic coupling system. Further, the electromagnetic coupling coil 111c of the reader / writer device 110 and the electromagnetic coupling coil 121c of the memory device 120 are in a state where their polarization planes face each other, and constitute a third electromagnetic coupling system.

[Configuration example of reader / writer device and memory device]
FIG. 2 shows a configuration example of the reader / writer device 110. The reader / writer device 110 includes electromagnetic coupling coils 111a to 111c, a control unit 112, a communication control unit 113, a transmission unit 114, a reception unit 115, an external interface 116, and a power feeding unit 117. Yes. The control unit 112, the communication control unit 113, and the external interface 116 can usually be configured by an LSI such as one CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), or ASIC (Application Specific Integrated Circuit).

  The control unit 112 performs overall control in the reader / writer device 110 such as external interface control, transmission / reception control, and power supply control. The transmission unit 114 encodes transmission data to generate encoded data, and supplies a transmission signal (current) corresponding to the encoded data to the electromagnetic coupling coil 111c. The receiving unit 115 acquires encoded data from the received signal (current) supplied from the electromagnetic coupling coil 111b, and decodes the encoded data to obtain received data. The communication control unit 113 controls operations of the transmission unit 114 and the reception unit 115 under the control of the control unit 112.

  The external interface 116 is an interface for connecting the reader / writer device 110 to an external device or the host device 130. The external interface 116 can be configured by a standard interface such as Ethernet (registered trademark), RS232C, USB, IrDA, Bluetooth, IEEE802.11b. The power feeding unit 117 causes a current for power transmission to flow through the electromagnetic coupling coil 111a.

  FIG. 3 shows a configuration example of the memory device 120. The memory device 120 includes electromagnetic coupling coils 121a to 121c, a control unit 122, a communication control unit 123, a reception unit 124, a transmission unit 125, a memory unit 126, and a power reception unit 127. The control unit 122 and the communication control unit 123 can usually be configured by one LSI such as a CPU, FPGA, or ASIC.

  The control unit 122 performs overall control in the memory device 120 such as memory access, transmission / reception control, and power reception control. The receiving unit 124 obtains encoded data from the reception signal (current) supplied from the electromagnetic coupling coil 121c, and decodes the encoded data to obtain reception data. The transmission unit 125 encodes the transmission data to generate encoded data, and supplies a transmission signal (current) corresponding to the encoded data to the electromagnetic coupling coil 121b. The communication control unit 123 controls operations of the reception unit 124 and the transmission unit 125 under the control of the control unit 122.

  The memory unit 126 includes a nonvolatile memory such as a flash memory or a volatile memory such as a DRAM (Dynamic Random Access Memory). The memory unit 126 may have a configuration in which a storage medium such as a memory card is detachably attached. The memory unit 126 holds content data such as still images, moving images, and music, for example. The power receiving unit 127 obtains power supply power using the induced electromotive force generated in the electromagnetic coupling coil 121 a and supplies power to each unit of the memory device 120.

[Code example and transmission / reception circuit example]
In this embodiment, data communication is performed between the reader / writer device 110 and the memory device 120 using encoded data based on a DC-free and clock reproducible code. By making it DC-free, data communication by electromagnetic coupling becomes possible. In addition, by making the clock reproducible, it is possible to transmit data without sending a separate clock signal to the other party.

  4 and 5 show examples of suitable codes. FIG. 4A shows an example of Manchester code. This Manchester code is also called a bi-face code. FIG. 4B shows an example of a multi-level Manchester code. FIG. 5A shows an example of an AMI (AlternateMark Inversion) code. FIG. 5B shows an example of a clock (CLK) superimposed AMI code. Note that these symbols are well-known symbols and will not be described in detail.

  FIG. 6 shows the spectrum of each code shown in FIGS. FIG. 6A shows the spectrum of the Manchester code and the AMI code. FIG. 6B shows the spectrum of the clock superimposed AMI code. From these spectrum diagrams, it can be seen that the codes shown in FIGS. 4 and 5 have no DC component (DC free) and have a clock component of fclk and can be regenerated.

  FIG. 7 shows a circuit example for generating the codes shown in FIGS. 4 and 5 described above. In this circuit example, the amplitude of a digital signal (clock signal, DATA0, DATA1) is adjusted by an attenuator (ATT), synthesized, and further passed through a filter, so that one of the symbols shown in FIGS. It can be generated as a transmission signal.

  For example, in the case of the Manchester code, it is only necessary to directly transmit the Manchester code from a digital signal of only one of DATA0 / DATA1, and the unused pins may be set in a high impedance state. When multi-leveling is performed, for example, the amplitude of DATA0 only needs to be twice that of DATA1. Furthermore, when superimposing clock components, it is only necessary to transmit and synthesize a CLK signal. Therefore, by using any of the symbols shown in FIGS. 4 and 5, a transmission system can be assembled with a very simple circuit.

  FIG. 8 shows an example of a receiving circuit. In this example, clock recovery is performed using a clock recovery circuit (CDR: Clock Data Recovery). In this example, a noise component is removed from the received signal by a filter. Thereafter, the received signal is amplified by an amplifier, and branching is performed as many times as necessary (multi-value + clock). Then, the clock recovery circuit performs clock recovery from one of the branch reception signals, and the amplitudes of the other branch reception signals are determined by a comparator to obtain a digital signal (clock signal, DATA0 to DATAN).

  FIG. 9 shows another example of the receiving circuit. In this example, clock extraction is performed using a bandpass filter (BPF). It can be used when a code directly superimposing a clock is used. For example, when the clock superposition AMI code shown in FIG. 5B is used, the clock signal can be extracted only by passing through a band-pass filter having a frequency corresponding to the superposed clock signal. The rest of the receiving circuit of FIG. 9 is configured in the same manner as the receiving circuit of FIG.

[Operation example of wireless communication system]
An example of the operation of the wireless communication system 100 shown in FIGS. 1, 2, and 3 will be described. When data communication is performed between the reader / writer device 110 and the memory device 120, the memory device 120 is fitted in the fitting portion 110a of the reader / writer device 110 (see FIG. 1). In this state, the electromagnetic coupling coils 111a, 111b, and 111c of the reader / writer device 110 face the electromagnetic coupling coils 121a, 121b, and 121c of the memory device 120, and three electromagnetic coupling systems are configured. The

  First, the power transmission operation from the reader / writer device 110 to the memory device 120 will be described. In the reader / writer device 110, under the control of the control unit 112, a current for power transmission flows from the power feeding unit 117 to the electromagnetic coupling coil (primary coil) 111 a. At this time, an induced electromotive force is generated in the electromagnetic coupling coil (secondary coil) 121a of the memory device 120 that constitutes one electromagnetic coupling system with the electromagnetic coupling coil 111a. This induced electromotive force is supplied to the power receiving unit 127. In the power receiving unit 127, processing such as rectification and smoothing is performed on the induced electromotive force to obtain power supply power. Then, power is supplied from the power receiving unit 127 to each unit of the memory device 120. Note that contactless power transmission using such an electromagnetic coupling action is described in paragraph “0004” of Japanese Patent Laid-Open No. 2005-151609.

  Next, an operation when content data such as a still image, a moving image, and music from an external device or host device 130 is transmitted and held from the reader / writer device 110 to the memory device 120 will be described.

  In the reader / writer device 110, content data such as a still image, a moving image, and music from an external device or the host device 130 is supplied to the transmission unit 114 via the external interface 116, the control unit 112, and the communication control unit 113. In the transmission unit 114, the content data is encoded by a DC-free and clock-recoverable code such as a Manchester code (see FIGS. 4 and 5) to obtain encoded data. A transmission signal (current) corresponding to the encoded data is supplied from the transmitter 114 to the electromagnetic coupling coil (primary coil) 111c.

  At this time, a reception signal (current) corresponding to the encoded data is obtained in the electromagnetic coupling coil 111c and the electromagnetic coupling coil (secondary coil) 121c of the memory device 120 constituting one electromagnetic coupling system. In the memory device 120, the reception signal obtained by the electromagnetic coupling coil 121 c is supplied to the reception unit 124.

  The reception unit 124 obtains encoded data from the received signal, and further decodes the encoded data to obtain received data (content data such as a still image, a moving image, and music). The reception unit 124 reproduces or extracts a clock signal from the received encoded data, and the clock signal is used in a decoding process or the like. The reception data obtained by the receiving unit 124 is supplied to and held in the memory unit 126 via the communication control unit 123 and the control unit 122.

  Next, an operation when content data such as a still image, a moving image, and music held in the memory device 120 is supplied to the external device or the host device 130 through the reader / writer device 110 will be described.

  In the memory device 120, content data such as a still image, a moving image, and music read from the memory unit 126 is supplied to the transmission unit 125 via the control unit 122 and the communication control unit 123. In the transmission unit 125, the content data is encoded by a DC-free and clock-recoverable code such as Manchester code (see FIGS. 4 and 5) to obtain encoded data. Then, a transmission signal (current) corresponding to the encoded data is supplied from the transmitter 125 to the electromagnetic coupling coil (primary coil) 121b.

  At this time, a reception signal (current) corresponding to the encoded data is obtained in the electromagnetic coupling coil (secondary coil) 111b of the reader / writer device 110 constituting one electromagnetic coupling system with this electromagnetic coupling coil 121b. It is done. In the reader / writer device 110, the reception signal thus obtained by the electromagnetic coupling coil 111 b is supplied to the reception unit 115.

  The receiving unit 115 obtains encoded data from the received signal, and further decodes the encoded data to obtain received data (content data such as a still image, a moving image, and music). The reception unit 115 reproduces or extracts a clock signal from the received encoded data, and the clock signal is used in a decoding process or the like. The reception data obtained by the receiving unit 115 is supplied to the external device or the host device 130 via the communication control unit 113, the control unit 112, and the external interface 116.

  As described above, in the wireless communication system 100 shown in FIGS. 1, 2, and 3, the electromagnetic coupling including the electromagnetic coupling coil 111 a of the reader / writer device 110 and the electromagnetic coupling coil 121 a of the memory device 120. Power transmission is performed by the system. In addition, data communication is performed by an electromagnetic coupling system including the electromagnetic coupling coils 111 b and 111 c of the reader / writer device 110 and the electromagnetic coupling coils 121 b and 121 c of the memory device 120. Therefore, power transmission and data communication can be performed independently, and sufficient power for communication of content data such as still images, moving images, music, and the like can be supplied from the reader / writer device 110 to the memory device 120.

  Further, data is transmitted from the reader / writer device 110 to the memory device 120 by an electromagnetic coupling system including the electromagnetic coupling coil 111 c of the reader / writer device 110 and the electromagnetic coupling coil 121 c of the memory device 120. On the other hand, data transmission from the memory device 120 to the reader / writer device 110 is performed by an electromagnetic coupling system configured by the electromagnetic coupling coil 111b of the reader / writer device 110 and the electromagnetic coupling coil 121b of the memory device 120. Therefore, data transmission from the reader / writer device 110 to the memory device 120 and data transmission from the memory device 120 to the reader / writer device 110 can be simultaneously performed in parallel. In this case, spontaneous data transmission from the memory device 120 to the reader / writer device 110 is also possible.

  Further, the electromagnetic coupling coils 111a, 111b, and 111c of the reader / writer device 110 have polarization planes that are orthogonal to each other, and therefore have polarization planes that are not correlated with each other. In addition, the electromagnetic coupling coils 121a, 121b, and 121c of the memory device 120 also have polarization planes that are orthogonal to each other and thus have no correlation with each other. Therefore, interference between the three electromagnetic coupling systems is suppressed. Therefore, data communication can be performed satisfactorily without being affected by power transmission. In addition, data transmission from the reader / writer device 110 to the memory device 120 and data transmission from the memory device 120 to the reader / writer device 110 can be favorably performed without being affected by the other data transmission. it can.

  Further, in data communication between the reader / writer device 110 and the memory device 120, data communication is performed using encoded data based on codes that are DC-free and clock reproducible. By being DC-free, data communication by electromagnetic coupling can be performed satisfactorily. In addition, since the clock can be reproduced, data transmission can be performed without sending a separate clock signal to the other party.

<2. Modification>
[Other arrangement examples of coils for electromagnetic coupling]
In the above-described embodiment, as shown in FIG. 1, the electromagnetic coupling coils 111a, 111b, and 111c of the reader / writer device 110 constitute the fitting portion 110a so that the planes of polarization are orthogonal to each other. It is buried corresponding to one side. As a result, the polarization planes of the electromagnetic coupling coils 111a, 111b, and 111c are not correlated with each other.

  However, the arrangement in which the polarization planes of the first coil and the second coil are not correlated with each other is not limited to the case where the first coil and the second coil are arranged so as to be orthogonal to each other.

  For example, FIG. 10A shows a case where the angle formed by the first electromagnetic coupling system L1 and the second electromagnetic coupling system L2 is 90 degrees. FIG. 10B shows a case where the angle formed by the first electromagnetic coupling system L1 and the second electromagnetic coupling system L2 is 180 degrees. FIG. 10C shows a case where the angle formed by the first electromagnetic coupling system L1 and the second electromagnetic coupling system L2 is 270 degrees. Not only when the angle between the electromagnetic coupling systems L1 and L2 is 90 degrees, but also when the angle between the electromagnetic coupling systems L1 and L2 is between 90 degrees and 270 degrees, the polarization planes of these electromagnetic coupling systems L1 and L2 are correlated. It will not have.

  FIG. 11 shows an example in which the reader / writer device 110 is embedded corresponding to the bottom surface constituting the fitting portion 110a so that the polarization planes of the electromagnetic coupling coils 111a, 111b, and 111c are parallel to each other. Show. In this example, the memory device 120 has an electromagnetic coupling corresponding to one surface facing the bottom surface of the fitting portion 110a in a state where the memory device 120 is fitted to the fitting portion 110a of the reader / writer device 110 described above. Coils 121a, 121b, and 121c are embedded. In this case, the polarization planes of the electromagnetic coupling coils 121a, 121b, and 121c are parallel to each other. Also in this case, when the memory device 120 is fitted to the fitting portion 110a of the reader / writer device 110, three electromagnetic coupling systems are configured as in the above-described embodiment.

[Transmission / reception coil]
In the above-described embodiment, the reader / writer device 110 includes both the electromagnetic coupling coil 111c for the transmission system and the electromagnetic coupling coil 111b for the reception system. Similarly, the memory device 120 includes both a transmission-system electromagnetic coupling coil 121b and a reception-system electromagnetic coupling coil 121c.

  The configuration using these two transmission and reception electromagnetic coupling coils can be replaced with a configuration using one common electromagnetic coupling coil. FIG. 12 shows a connection example in that case. In this case, the transmission system circuit (transmission unit) and the reception system circuit (reception unit) are connected to a common electromagnetic coupling coil Lo via a balun.

  As described above, according to the configuration in which the two electromagnetic coupling coils for the transmission system and the reception system are replaced with one common electromagnetic coupling coil, the reader / writer device 110 and the memory device 120 are provided with the electromagnetic coupling coil. An area for installation can be saved, and the size of the apparatus can be reduced.

[Transmission / Reception switching]
In the above-described embodiment, the reader / writer device 110 is connected to the memory device 120 by the electromagnetic coupling system including the electromagnetic coupling coil 111c of the reader / writer device 110 and the electromagnetic coupling coil 121c of the memory device 120. Data transmission is performed. On the other hand, data transmission from the memory device 120 to the reader / writer device 110 is performed by an electromagnetic coupling system configured by the electromagnetic coupling coil 111b of the reader / writer device 110 and the electromagnetic coupling coil 121b of the memory device 120. That is, the directions of data communication in the two electromagnetic coupling systems are different from each other.

  However, the direction of data communication between these two electromagnetic coupling systems can be arbitrarily switched. In that case, two electromagnetic coupling systems can be used for data transmission from the reader / writer device 110 to the memory device 120, or data transmission from the memory device 120 to the reader / writer device 110, thereby increasing the data transfer rate. Can do.

  FIG. 13 shows a configuration example of the reader / writer device 110A that can arbitrarily switch the direction of data communication between two electromagnetic coupling systems. In this reader / writer device 110A, a transmitter / receiver 114A and a transmitter / receiver 115A are arranged in place of the transmitter 114 and the receiver 115 in the reader / writer device 110 shown in FIG.

  The transmission / reception units 114A and 115A are switched so that they function as a transmission unit when the electromagnetic coupling system of the electromagnetic coupling coils 111c and 111b is used for data transmission. In addition, when the electromagnetic coupling system of the electromagnetic coupling coils 111c and 111b is used for data reception, the transmission / reception units 114A and 115A are switched in function so as to function as reception units.

  Note that this function switching is performed under the control of the control unit 112, for example. Although detailed description is omitted, the control unit 112 also appropriately controls operation change for the communication control unit 113, the external interface 116, and the like in accordance with the function switching.

  FIG. 14 shows a configuration example of the memory device 120A in which the data communication directions of the two electromagnetic coupling systems can be arbitrarily switched. In this memory device 120A, a transmitting / receiving unit 124A and a transmitting / receiving unit 125A are arranged in place of the receiving unit 124 and the transmitting unit 125 in the memory device 120 shown in FIG.

  The transmission / reception units 124A and 125A are switched to function as a transmission unit when the electromagnetic coupling system of the electromagnetic coupling coils 121c and 121b is used for data transmission. In addition, when the electromagnetic coupling system of the electromagnetic coupling coils 121c and 121b is used for data reception, the transmission / reception units 124A and 125A are switched so that they function as reception units.

  This function switching is performed under the control of the control unit 122, for example. Although detailed description is omitted, the control unit 122 also appropriately controls operation change for the communication control unit 123, the memory unit 126, and the like in accordance with the function switching.

[Memory device with power supply]
In the above embodiment, the memory device 120 (see FIG. 2) does not have a power supply unit using a battery or the like. However, a configuration including a power supply unit can be considered as the memory device. FIG. 15 shows a configuration example of the memory device 120B including the power supply unit 128 using a battery or the like. In FIG. 15, portions corresponding to those in FIG. 3 are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the memory device 120B, the power source power obtained by the power receiving unit 127 is supplied to each unit of the memory device 120B through the power source unit 128. In this case, when the power supply unit 128 is configured using, for example, a battery (secondary battery), power consumption from the battery can be suppressed due to the presence of the power receiving unit 127 described above.

[Others]
In the above-described embodiment, the radio communication system 100 having three electromagnetic coupling systems is shown. However, the number of electromagnetic coupling systems is not limited to three, but two or four or more. There may be. Even in these cases, it is necessary to arrange the coils constituting each electromagnetic coupling system so that their planes of polarization do not correlate with each other.

  In the above-described embodiment, the present invention is applied to the wireless communication system 100 that performs data communication between the reader / writer device and the memory device. The present invention can be similarly applied when data communication is performed between other wireless communication apparatuses. For example, a wireless communication function similar to that of a memory device can be provided to a digital camera, a portable audio playback device, a cellular phone, a portable information terminal, or the like.

  The present invention can perform power transmission and data communication independently using electromagnetic coupling systems independent from each other, and can be applied to a wireless communication system or the like that communicates content data such as still images, moving images, and music. .

It is a figure which shows schematically the external appearance of the radio | wireless communications system as embodiment of this invention. It is a block diagram which shows the structural example of the reader / writer apparatus which comprises a radio | wireless communications system. It is a block diagram which shows the structural example of the memory apparatus which comprises a radio | wireless communications system. It is a figure which shows the example (Manchester code | cord | chord, multi-valued Manchester code | cord | chord) of the code | symbol which can be DC-free and can reproduce | regenerate a clock. It is a figure which shows the example (AMI code | cord | chord, clock superimposition AMI code | symbol) of the code | symbol which can be DC-free and clock-recovered. It is a figure which shows the spectrum of a Manchester code, a multi-level Manchester code, an AMI code, and a clock superimposition AMI code. It is a figure which shows the example of a circuit for producing | generating codes, such as a Manchester code, a multilevel Manchester code, an AMI code, and a clock superimposition AMI code. It is a figure which shows the structural example of receiving circuits, such as a Manchester code | cord | chord, a multi-level Manchester code | cord | chord, an AMI code, and a clock superimposition AMI code. It is a figure which shows the other structural examples of receiving circuits, such as Manchester code | cord | chord, multi-level Manchester code | cord | chord, AMI code | symbol, and clock superimposition AMI code | symbol. It is a figure which shows an example of the arrangement | positioning which the polarization planes of two coils do not have a correlation with each other. It is a figure which shows the example arrange | positioned so that the polarization planes of several electromagnetic coupling coils may become mutually parallel. It is a figure which shows the example of a connection at the time of replacing the structure using the coil for electromagnetic coupling of two transmission systems and a receiving system with the structure using one common coil for electromagnetic coupling. It is a figure which shows the structural example of the reader-writer apparatus which enabled the direction of the data communication of two electromagnetic coupling systems to be switched arbitrarily. It is a figure which shows the structural example of the memory device which enabled change of the direction of data communication of two electromagnetic coupling systems arbitrarily. It is a figure which shows the structural example of the memory apparatus provided with the power supply part using a battery.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 100 ... Wireless communication system, 110, 110A ... Reader / writer apparatus, 110a ... Fitting part, 111a-111c ... Coil for electromagnetic coupling, 112 ... Control part, 113 ... Communication Control unit, 114 ... transmission unit, 114A, 115A ... transmission / reception unit, 115 ... reception unit, 116 ... external interface, 117 ... power supply unit, 120, 120A, 120B ... memory device 121a to 121c, coils for electromagnetic coupling, 122, a control unit, 123, a communication control unit, 124, a receiving unit, 124A, 125A, a transmitting / receiving unit, 125, a transmitting unit, 126: Memory unit, 127: Power receiving unit, 128: Power supply unit

Claims (11)

A plurality of coils for electromagnetic coupling having polarization planes that are not correlated with each other;
Among the plurality of electromagnetic coupling coils, a power receiving unit that obtains power using an induced electromotive force generated in the first electromagnetic coupling coil;
Among the plurality of electromagnetic coupling coils, data communication is performed with an external device by an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil. A data communication unit to perform;
A wireless communication apparatus comprising: a memory unit that stores data handled by the data communication unit. The wireless communication apparatus according to claim 1, wherein the data communication unit performs data communication with the external device using encoded data based on a code that is DC-free and clock-recoverable. The wireless communication apparatus according to claim 1, further comprising a power supply unit that obtains power supply power. The second electromagnetic coupling coil includes a transmission coil and a reception coil,
The wireless communication according to claim 1, wherein the data communication unit transmits data to the external device by an electromagnetic coupling system using the transmission coil, and receives data from the external device by an electromagnetic coupling system using the reception coil. Communication device. Using a common electromagnetic coupling coil as the transmission coil and the reception coil,
The wireless communication apparatus according to claim 4, wherein the transmission system circuit and the reception system circuit of the data communication unit are connected to the common electromagnetic coupling coil via a balun. A plurality of coils for electromagnetic coupling having polarization planes that are not correlated with each other;
Among the plurality of coils for electromagnetic coupling, a power feeding unit that sends a current for power transmission to the first coil for electromagnetic coupling;
Among the plurality of electromagnetic coupling coils, data communication is performed with an external device by an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil. A wireless communication device comprising a data communication unit for performing. The wireless communication apparatus according to claim 6, wherein the data communication unit performs data communication with the external device using encoded data that is DC-free and clock-recoverable. The second electromagnetic coupling coil includes a transmission coil and a reception coil,
The wireless communication according to claim 6, wherein the data communication unit transmits data to the external device by an electromagnetic coupling system using the transmission coil, and receives data from the external device by an electromagnetic coupling system using the reception coil. Communication device. Using a common electromagnetic coupling coil as the transmission coil and the reception coil,
The wireless communication device according to claim 8, wherein the transmission system circuit and the reception system circuit of the data communication unit are connected to the common electromagnetic coupling coil via a balun. A wireless communication method in a wireless communication system comprising a first wireless communication device and a second wireless communication device,
While performing power transmission from the second wireless communication device to the first wireless communication device using the first electromagnetic coupling system,
Data communication is performed between the first wireless communication apparatus and the second wireless communication apparatus using a second electromagnetic coupling system having a polarization plane that is not correlated with the first electromagnetic coupling system. Wireless communication method. A wireless communication system comprising a first wireless communication device and a second wireless communication device,
The first wireless communication device includes:
A plurality of coils for electromagnetic coupling having polarization planes that are not correlated with each other;
Among the plurality of electromagnetic coupling coils, a power receiving unit that obtains power using an induced electromotive force generated in the first electromagnetic coupling coil;
Among the plurality of electromagnetic coupling coils, an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil is used to communicate with the second wireless communication device. A data communication unit for performing data communication between them,
A memory unit for storing data handled by the data communication unit;
The second wireless communication device is
A plurality of coils for electromagnetic coupling having polarization planes that are not correlated with each other;
Among the plurality of coils for electromagnetic coupling, a power feeding unit that sends a current for power transmission to the first coil for electromagnetic coupling;
Among the plurality of electromagnetic coupling coils, an electromagnetic coupling system using one or a plurality of second electromagnetic coupling coils different from the first electromagnetic coupling coil is used to communicate with the first wireless communication device. A wireless communication system having a data communication unit for performing data communication between them.

Images