WO2009123087A1 - 電界通信用電子機器 - Google Patents
電界通信用電子機器 Download PDFInfo
- Publication number
- WO2009123087A1 WO2009123087A1 PCT/JP2009/056445 JP2009056445W WO2009123087A1 WO 2009123087 A1 WO2009123087 A1 WO 2009123087A1 JP 2009056445 W JP2009056445 W JP 2009056445W WO 2009123087 A1 WO2009123087 A1 WO 2009123087A1
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- WO
- WIPO (PCT)
- Prior art keywords
- field communication
- electric field
- electronic device
- electrode
- transmission medium
- Prior art date
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B13/00—Transmission systems characterised by the medium used for transmission, not provided for in groups H04B3/00 - H04B11/00
- H04B13/005—Transmission systems in which the medium consists of the human body
Definitions
- the present invention relates to an electronic device used in a system that transmits and receives an electric field signal via a transmission medium such as a human body or space.
- Patent Document 1 For a communication system that transmits and receives via a transmission medium (mainly a human body), a method of communicating using an electric field is disclosed in Patent Document 1 and the like.
- an electrode pair that is, a human body side (internal) electrode that is closely capacitively coupled to the human body, and a coupling to room ground are oriented so as to be larger than the human body side (internal) electrode.
- Each pair of transmitter and receiver is provided with a pair of outer (external) electrodes.
- the electrode pair 92 is opposed to the surface of the electronic device 91 or the vicinity thereof. For example, if one is an upper surface, the other is disposed on the lower surface.
- electronic devices for such communication systems there are electronic keys, IC cards, and the like represented by keyless entry systems for automobiles, in addition to mobile phones and mobile games. It has been requested. Japanese National Patent Publication No. 11-509380
- this problem is to increase the electrode area as much as possible by arranging the electrode on the surface as much as possible. Measures are necessary because it becomes more prominent due to the fact that the electrode area is almost equal to eliminate the need to distinguish between the front and back, and that the distance between the human body side electrode and the outer electrode is shortened to make it thinner. It is.
- the present invention has been made in view of the above points, and an object of the present invention is to provide an electronic device for electric field communication that is not easily affected by static electricity even when charged with static electricity and can maintain sufficient performance.
- the electronic device for electric field communication is an electronic device used as a transmitter and / or a receiver in a system that performs electric field communication via a transmission medium, and the electronic device has at least a transmission medium side electrode and an outer electrode.
- the impedance between the transmission medium side electrode and the outer electrode is substantially maximum at a frequency used in the electric field communication.
- the impedance between the transmission medium side electrode and the outer electrode becomes small, and even if the electrode is touched with static electricity, the charge is released. And the influence of static electricity on the electronic equipment can be prevented.
- This effect is effective both when the electronic device is used for a transmitter and when used for a receiver.
- the frequency band used for electric field communication since the impedance between the transmission medium side electrode and the outer electrode is maximized, the loss through the capacitance between the transmission medium side electrode and the outer electrode is reduced, When the electronic device is used as a transmitter, the transmission efficiency is improved, and when it is used as a receiver, the reception sensitivity is improved. For this reason, the communication quality as a system improves. It is also possible to suppress the communication quality to the same level, reduce the power consumption of the transmitter, and extend the battery life.
- a circuit board for electric field communication is disposed between the transmission medium side electrode and the outer electrode, and the circuit board includes the transmission medium side electrode and the transmission medium side electrode. It is preferable that one electrode of the outer electrode is connected and the other electrode is capacitively coupled to the ground of the circuit board.
- the electric field communication electronic device includes an inductor that forms a parallel resonance circuit with a capacitance between the transmission medium side electrode and the outer electrode, and the resonance frequency of the parallel resonance circuit is equal to the electric field.
- the frequency is preferably substantially the same as the frequency used for communication.
- the parallel resonance circuit is configured by the capacitance and the inductor between the transmission medium side electrode and the outer electrode, the Q value of the resonance circuit is high, and the impedance is set at a frequency other than the frequency used for electric field communication. It can be remarkably reduced and the effect of countermeasures against static electricity is increased. Further, in the frequency band used for electric field communication, since the impedance becomes larger, transmission efficiency is improved, reception sensitivity is improved, and communication quality is further improved.
- a capacitive coupling member exists between the transmission medium side electrode and the outer electrode, and the impedance of the electrostatic capacitance via the capacitive coupling member is the electric field communication. It is preferable that the frequency used in is approximately maximum.
- the impedance can be maximized in the frequency band used for electric field communication and reduced in other frequencies even in the capacitance between the capacitive coupling members, so that the above-described effect can be obtained with certainty.
- the electronic device includes a plurality of housings having a plurality of postures, and an impedance between the transmission medium side electrode and the outer electrode in each posture is the electric field. It is preferable to have a control means for controlling the capacity and / or the inductance so that the frequency used in communication becomes substantially maximum. According to this configuration, for example, even in an electronic device such as a foldable mobile phone, sufficient countermeasures against static electricity can be taken in both an open state and a plurality of folded states, and good communication quality can be obtained. it can.
- the electronic device for electric field communication is an electronic device used as a transmitter and / or a receiver in a system that performs electric field communication via a transmission medium, and the electronic device has at least a transmission medium side electrode and an outer electrode.
- the impedance between the transmission medium side electrode and the outer electrode is substantially maximum at the frequency used in the electric field communication, even when charged with static electricity, it is hardly affected by static electricity and maintains sufficient performance. can do.
- FIG. 1 It is a schematic block diagram which shows the electric field communication system using the electronic device which concerns on embodiment of this invention.
- (A), (b) is the schematic which shows the basic composition of the electronic device for electric field communication which concerns on embodiment of this invention. It is a figure for demonstrating the impedance in the electronic device for electric field communication which concerns on embodiment of this invention.
- (A), (b) is the schematic which shows the electronic device for electric field communication which concerns on embodiment of this invention. It is a figure for demonstrating the inductance transistor introduced between a human body side electrode and an outer side electrode. It is a figure for demonstrating the stub introduced between a human body side electrode and an outer side electrode. It is a figure for demonstrating the capacitive coupling member in the electronic device for electric field communication.
- (A)-(c) is a figure which shows the attitude
- the transmission medium side electrode and the outer electrode often face each other as described above.
- the capacitance between the electrodes (capacitance Csg between the signal electrode and the reference electrode) cannot be reduced. For this reason, it is assumed that the electric field signal is lost via the capacitance Csg.
- the present inventors pay attention to such points, and by introducing an inductance L between the transmission medium side electrode and the outer electrode, and by causing parallel resonance with the capacitance Csg between the transmission medium side electrode and the outer electrode, It has been found that the loss of the electric field signal through the capacitor Csg can be suppressed, and has led to the present invention.
- the essence of the present invention is that an electronic device used as a transmitter and / or a receiver in a system that performs electric field communication through a transmission medium has at least a transmission medium side electrode and an outer electrode,
- the impedance between the outer electrode and the outer electrode is substantially maximized at the frequency used in the electric field communication, and even when charged with static electricity, it is hardly affected by static electricity and maintains sufficient performance.
- FIG. 1 is a diagram for explaining an electric field communication system using an electronic apparatus according to an embodiment of the present invention.
- the human body side (internal) electrode that is closely capacitively coupled to the human body 2 and the coupling to the ground 4 are the human body side (internal).
- the transmitter 1 and the receiver 3 each have a pair of outer (external) electrodes oriented to be larger than the electrodes.
- a forward path (path A in FIG. 1) through which a signal is transmitted through capacitive coupling between a transmitter, a human body, and a receiver, and a receiver, a dielectric such as air, or a ground, etc.
- a return path (path B in FIG. 1) is required through which the signal flows through capacitive coupling with the conductor-receiver.
- an information signal is modulated with a carrier wave having a frequency (several hundred kHz to several tens of MHz) at which the human body exhibits conductivity, and a modulated signal is obtained.
- This modulated signal is amplified and converted into a voltage change, thereby becoming an electromagnetic field signal corresponding to the modulated signal.
- This electric field signal is applied to the human body that is the transmission medium 2.
- the electric field signal applied to the human body is received by the signal electrode of the receiver 3.
- the electric field signal applied to the signal electrode is amplified, demodulated using the carrier wave used in the transmitter 1, and output as an information signal.
- FIG. 2A is a schematic diagram showing an electronic device used as the transmitter 1 in the system shown in FIG. 1, and FIG. 2B is an electronic device used as the receiver 3 in the system shown in FIG. FIG.
- the transmitter 1 or the receiver 3 which is an electronic device has at least transmission medium side electrodes (here, human body side electrodes) 11 and 31 and outer electrodes 12 and 32, respectively.
- electric field communication circuit boards 13 and 33 are disposed between the transmission medium side electrodes (here, human body side electrodes) 11 and 31 and the outer electrodes 12 and 32, respectively.
- the human body side electrodes 11 and 31 and the outer electrodes 12 and 32 are connected by the impedance element Z, but as shown in FIG.
- the human body side electrodes 11 and 31 are substantially maximum at a frequency f 0 used in electric field communication. Note that it is desirable that the band that normally decreases from the peak to ⁇ 3 dB covers the frequency used in electric field communication.
- the electric field communication circuit boards 13 and 33 are connected to one electrode (here, the outer electrodes 12 and 32), and the other electrode (here, the human body side electrodes 11 and 31) is connected to the electric field communication circuit board 13. , 33 are capacitively coupled to the ground.
- the impedance between the human body side electrodes 11 and 31 and the outer electrodes 12 and 32 becomes small, and the electrodes are touched in a charged state with static electricity.
- static electricity does not flow to the electric field communication circuit boards 13 and 33 side but flows to the impedance element Z side, the charge can be released, and the influence of the static electricity on the electronic device can be prevented.
- the impedance between the human body side electrodes 11, 31 and the outer electrodes 12, 32 is maximized, and therefore, between the human body side electrodes 11, 31 and the outer electrodes 12, 32.
- Loss through the capacity is reduced, and transmission efficiency is improved when the electronic device is used as a transmitter, and reception sensitivity is improved when the electronic device is used as a receiver. For this reason, the communication quality as a system improves. It is also possible to suppress the communication quality to the same level, reduce the power consumption of the transmitter, and extend the battery life.
- the resonance frequency of the parallel resonance circuit is a frequency used in electric field communication.
- the inductance L is preferably set to a value that resonates with Csg when the transmitter and the receiver as electronic devices are respectively attached to the human body.
- the electric field communication circuit boards 13 and 33 are disposed between the transmission medium side electrodes (here, the human body side electrodes) 11 and 31 and the outer electrodes 12 and 32, respectively.
- the substrates 13 and 33 are connected to one electrode (here, the outer electrodes 12 and 32), and the other electrode (here, the human body side electrodes 11 and 31) is connected to the ground and capacitance of the circuit boards 13 and 33 for electric field communication. Are connected.
- the impedance between the human body side electrodes 11 and 31 and the outer electrodes 12 and 32 becomes small, and even if the electrodes are touched with static electricity, Since it does not flow to the electric field communication circuit boards 13 and 33 side but flows to the impedance element Z side, the electric charge can be released, and the influence on the electronic device due to static electricity can be prevented.
- the impedance between the human body side electrodes 11, 31 and the outer electrodes 12, 32 is maximized, and therefore, between the human body side electrodes 11, 31 and the outer electrodes 12, 32.
- Loss through the capacity is reduced, and transmission efficiency is improved when the electronic device is used as a transmitter, and reception sensitivity is improved when the electronic device is used as a receiver. For this reason, the communication quality as a system improves. It is also possible to suppress the communication quality to the same level, reduce the power consumption of the transmitter, and extend the battery life.
- a parallel resonant circuit may be configured using an inductance transistor in the same manner as described above.
- the electronic device is an IC card or various keys, it is desirable to make it thinner and smaller, so it is desirable to build the components into a semiconductor chip.
- FIG. 5 by using a transistor circuit that acts as an inductance without using a coil, it is easy to build in a semiconductor chip, and the element can be made small and inexpensive.
- the CR time constant is sufficiently large and ⁇ CR >> 1 is satisfied.
- FIG. 5 shows a basic configuration example of the inductor transistor, but all other transistor circuits acting as inductances can be used, such as a device for improving the Q value.
- the inductance value of the inductance transistor can be controlled, the impedance may be automatically controlled to the maximum value even when the capacitance changes.
- short stubs 41 having lengths of ⁇ / 4, 3 ⁇ / 4, 5 ⁇ / 4,. Even if it is provided between the outer electrode 31 and the outer electrodes 12, 32, the impedance can be maximized. In particular, when the frequency used in electric field communication is high, the configuration using the stub 41 is effective because the wavelength is short and the size of the stub may be small. In addition, it is possible to configure a parallel resonant circuit using the stub 41 as an inductance. In this case, an open stub may be used instead of the short stub. Further, a notch filter (or a band elimination filter) may be used. Even if such a filter is used, the input impedance can be increased at the frequency used in the electric field communication and the input impedance can be significantly reduced at other frequencies, and the effects of the present invention can be exhibited.
- the resonant circuit has a high Q value and a frequency other than the frequency used in electric field communication. Impedance can be remarkably reduced, and a static electricity countermeasure effect can be exhibited. Further, in the frequency band used for electric field communication, since the impedance becomes larger, transmission efficiency is improved, reception sensitivity is improved, and communication quality is further improved.
- a capacitive coupling member exists between the human body side electrodes 11 and 31 and the outer electrodes 12 and 32, and the impedances of the capacitances C1 to C5 via the capacitive coupling member are at frequencies used in electric field communication. It is preferable that it is substantially maximum. That is, in the frequency band used for electric field communication, the portion where the impedance between the human body side electrodes 11 and 31 and the outer electrodes 12 and 32 is maximized and the impedance is reduced at other frequencies is introduced. It is also necessary to consider the combined capacitance of the capacitances C2 to C5 shown in FIG.
- the combined capacitance of the capacitances C2 to C5 may be taken into consideration in one place, but it is effective to introduce the inductors L in a distributed manner according to each capacitance.
- the impedance is maximized in the frequency band used in the electric field communication and reduced in the other frequencies even in the capacitance between the respective capacitive coupling members, the effect of the present invention can be obtained with certainty.
- FIG. 8A shows a state in which two housings are opened
- FIG. 8C shows a state in which two housings are closed
- FIG. 8B shows an intermediate state.
- the outer electrode is provided in the LCD side casing 51 and the human body side electrode is provided in the input section side casing 52
- the capacitance between the human body side electrode and the outer electrode is different and opened (FIG. 8).
- the impedance between the human body side electrode and the outer electrode in each posture is substantially maximum at a frequency used in electric field communication. It is preferable to control the capacitance and / or inductance. According to this configuration, sufficient countermeasures against static electricity can be taken in any of a plurality of postures in the opened state and the folded state, and always good communication quality can be obtained.
- each posture between the casings is detected by an open / close sensor or the like.
- the electronic device may have a function of detecting the capacitance in each posture, and the control unit may automatically control the optimum inductance value corresponding to the detected capacitance.
- the impedance may be maximized by canceling the change in the capacitance between the human body side electrode and the outer electrode using a variable capacitor.
- the cell phone is folded and placed in a pocket, and electric field communication is performed in that state.
- stable communication can be performed regardless of the orientation of the mobile phone.
- the thickness of the casing and the dielectric It is preferable to adjust the rate.
- the present invention is not limited to the above embodiment, and can be implemented with various modifications.
- the circuit configuration, the number of parts, numerical values, and the like in the above embodiment are merely examples, and the present invention is not limited thereto and can be implemented with appropriate modifications. Other modifications can be made without departing from the scope of the present invention.
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
Description
図1は、本発明の実施の形態に係る電子機器を用いた電界通信システムを説明するための図である。
Claims (5)
- 伝送媒体を介して電界通信するシステムにおける送信機及び/又は受信機として用いる電子機器であって、前記電子機器は、少なくとも伝送媒体側電極及び外側電極を有し、前記伝送媒体側電極と前記外側電極との間のインピーダンスが、前記電界通信で用いる周波数において略極大であることを特徴とする電界通信用電子機器。
- 前記伝送媒体側電極と前記外側電極との間に、電界通信用の回路基板が配設されており、前記回路基板は、前記伝送媒体側電極及び前記外側電極の一方の電極と接続されており、他方の電極が前記回路基板のグランドと容量結合していることを特徴とする請求項1記載の電界通信用電子機器。
- 前記伝送媒体側電極と前記外側電極との間の静電容量と並列共振回路を構成するインダクタを有し、前記並列共振回路の共振周波数が、前記電界通信で用いる周波数と略同じであることを特徴とする請求項1又は請求項2記載の電界通信用電子機器。
- 前記伝送媒体側電極と前記外側電極との間に容量結合部材が存在しており、前記容量結合部材を介した静電容量について、インピーダンスが前記電界通信で用いる周波数において略極大であることを特徴とする請求項1から請求項3のいずれかに記載の電界通信用電子機器。
- 前記電子機器は、複数の姿勢をとる複数の筐体を備えており、各姿勢における前記伝送媒体側電極と前記外側電極との間のインピーダンスが前記電界通信で用いる周波数において略極大となるように、容量及び/又はインダクタンスを制御する制御手段を有することを特徴とする請求項1から請求項4のいずれかに記載の電界通信用電子機器。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2010505886A JP4733782B2 (ja) | 2008-04-02 | 2009-03-30 | 電界通信用電子機器 |
CN2009801105686A CN101981835A (zh) | 2008-04-02 | 2009-03-30 | 电场通信用电子设备 |
US12/895,269 US20110021141A1 (en) | 2008-04-02 | 2010-09-30 | Electronic device for electric-field communication |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008-095988 | 2008-04-02 | ||
JP2008095988 | 2008-04-02 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/895,269 Continuation US20110021141A1 (en) | 2008-04-02 | 2010-09-30 | Electronic device for electric-field communication |
Publications (1)
Publication Number | Publication Date |
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WO2009123087A1 true WO2009123087A1 (ja) | 2009-10-08 |
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ID=41135463
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/JP2009/056445 WO2009123087A1 (ja) | 2008-04-02 | 2009-03-30 | 電界通信用電子機器 |
Country Status (4)
Country | Link |
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US (1) | US20110021141A1 (ja) |
JP (1) | JP4733782B2 (ja) |
CN (1) | CN101981835A (ja) |
WO (1) | WO2009123087A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014030317A1 (ja) * | 2012-08-24 | 2014-02-27 | パナソニックヘルスケア株式会社 | 人体通信装置及び通信機器 |
JP2023051089A (ja) * | 2021-09-30 | 2023-04-11 | 東芝情報システム株式会社 | 電界式人体通信システム、送信装置及び受信装置 |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2413521A4 (en) * | 2009-03-26 | 2015-12-09 | Alps Electric Co Ltd | COMMUNICATION SYSTEM |
JP2015130607A (ja) * | 2014-01-08 | 2015-07-16 | 株式会社東芝 | 通信装置 |
JP6196003B2 (ja) * | 2014-06-18 | 2017-09-13 | コーニンクレッカ フィリップス エヌ ヴェKoninklijke Philips N.V. | 身体結合通信デバイス |
US9767919B1 (en) * | 2016-04-15 | 2017-09-19 | Micron Technology, Inc. | Systems and methods for testing a semiconductor memory device having a reference memory array |
CN112910485B (zh) * | 2021-01-27 | 2022-08-19 | 维沃移动通信有限公司 | 电子设备及信号控制方法 |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007295192A (ja) * | 2006-04-24 | 2007-11-08 | Nippon Telegr & Teleph Corp <Ntt> | 通信システムおよび送信器、受信器 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7227451B2 (en) * | 2004-08-04 | 2007-06-05 | Quadlogic Controls Corporation | Method and system for radio-frequency signal coupling to medium tension power lines with auto-tuning device |
-
2009
- 2009-03-30 CN CN2009801105686A patent/CN101981835A/zh active Pending
- 2009-03-30 WO PCT/JP2009/056445 patent/WO2009123087A1/ja active Application Filing
- 2009-03-30 JP JP2010505886A patent/JP4733782B2/ja not_active Expired - Fee Related
-
2010
- 2010-09-30 US US12/895,269 patent/US20110021141A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007295192A (ja) * | 2006-04-24 | 2007-11-08 | Nippon Telegr & Teleph Corp <Ntt> | 通信システムおよび送信器、受信器 |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014030317A1 (ja) * | 2012-08-24 | 2014-02-27 | パナソニックヘルスケア株式会社 | 人体通信装置及び通信機器 |
JP2023051089A (ja) * | 2021-09-30 | 2023-04-11 | 東芝情報システム株式会社 | 電界式人体通信システム、送信装置及び受信装置 |
JP7311799B2 (ja) | 2021-09-30 | 2023-07-20 | 東芝情報システム株式会社 | 電界式人体通信システム、送信装置及び受信装置 |
Also Published As
Publication number | Publication date |
---|---|
US20110021141A1 (en) | 2011-01-27 |
JP4733782B2 (ja) | 2011-07-27 |
CN101981835A (zh) | 2011-02-23 |
JPWO2009123087A1 (ja) | 2011-07-28 |
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