JP2019054366A - Communication terminal - Google Patents

Communication terminal Download PDF

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JP2019054366A
JP2019054366A JP2017176616A JP2017176616A JP2019054366A JP 2019054366 A JP2019054366 A JP 2019054366A JP 2017176616 A JP2017176616 A JP 2017176616A JP 2017176616 A JP2017176616 A JP 2017176616A JP 2019054366 A JP2019054366 A JP 2019054366A
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battery
communication terminal
signal electrode
conductive portion
communication
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JP7013747B2 (en
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祥 山田
Sho Yamada
祥 山田
智 三嶋
Satoshi Mishima
智 三嶋
大輔 磯田
Daisuke Isoda
大輔 磯田
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Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Abstract

To provide a communication terminal that suppresses an impact on communication by a capacity formation body such as a loaded battery or a memory card.SOLUTION: A communication terminal 1 includes: a planar signal electrode 10 provided at a position facing a reference electrode 2; an electric field communication unit 6 for communicating an electric signal by a potential difference between the reference electrode 2 and the signal electrode 10 via a transmittable communication medium; and a battery 4 provided such that it faces the signal electrode 10. The signal electrode 10 includes a conductive portion 11 that transmits electricity and a non-conductive portion 12 that does not transmit electricity, and the non-conductive portion 12 is formed on at least a part of a battery area 13 overlapping with the facing battery 4.SELECTED DRAWING: Figure 1

Description

本発明は、通信端末に関する。   The present invention relates to a communication terminal.

従来、電界（人体）通信の機能を有する通信端末が提案されている（例えば、特許文献１，２参照）。   Conventionally, communication terminals having an electric field (human body) communication function have been proposed (see, for example, Patent Documents 1 and 2).

特許第５０１２８３０号公報Japanese Patent No. 5012830 特開２０１５−１９２２１１号公報Japanese Patent Laying-Open No. 2015-192221

特許文献１，２に記載の通信端末を携帯して運用する場合、電源としては、ボタン電池等の一次電池や、外部より充電可能な二次電池が想定される。特許文献１，２に記載の通信端末では、電源としての電池が、信号電極に重なる位置に配置されている。このような通信端末について、以下に、より詳細に説明する。
図９は、従来の通信端末９０１を示す図である。図９（Ａ）は、通信端末９０１の厚み方向Ｚに平行な断面における断面模式図である。図９（Ｂ）は、図９（Ａ）のＡ−Ａ矢視図である。
図９（Ａ）に示すように、通信端末９０１は、信号電極９１０を備える。また、通信端末９０１は、電池４を備える。図９（Ｂ）に示すように、信号電極９１０は、その全面において、信号電極パターンを有する導電体により構成されている。よって、信号電極９１０は、電池４に重なる領域にも、信号電極パターンを有する。また、信号電極９１０と電池４との間隔が狭い。そのため、通信端末９０１において、信号電極９１０と電池４との間に、一定の静電容量Ｃが発生する。 When the communication terminal described in Patent Documents 1 and 2 is carried and operated, a primary battery such as a button battery or a secondary battery that can be charged from the outside is assumed as a power source. In the communication terminals described in Patent Documents 1 and 2, a battery as a power source is arranged at a position overlapping the signal electrode. Such a communication terminal will be described in more detail below.
FIG. 9 is a diagram showing a conventional communication terminal 901. FIG. 9A is a schematic cross-sectional view in a cross section parallel to the thickness direction Z of the communication terminal 901. FIG. 9B is an AA arrow view of FIG.
As shown in FIG. 9A, the communication terminal 901 includes a signal electrode 910. In addition, the communication terminal 901 includes the battery 4. As shown in FIG. 9B, the signal electrode 910 is formed of a conductor having a signal electrode pattern on the entire surface thereof. Therefore, the signal electrode 910 also has a signal electrode pattern in a region overlapping the battery 4. Further, the distance between the signal electrode 910 and the battery 4 is narrow. For this reason, in the communication terminal 901, a certain capacitance C is generated between the signal electrode 910 and the battery 4.

上述の通信端末９０１において、電源として一次電池を使用する場合には、電池消耗後に電池を交換することになる。その際、電池の個体差により、静電容量Ｃの値が変わり、場合によっては、電極の共振周波数がずれて、通信性能が劣化つながってしまう。
また、上述の通信端末９０１において、電源として電池交換を想定しない二次電池を使用する場合においても、充放電の繰り返しによる電池の厚み変化によって、電池と信号電極９１０との間隔が変化する。そのことにより、信号電極９１０と電池との間に生じる静電容量Ｃの値が変わり、やはり、通信性能の劣化につながってしまう。 In the communication terminal 901 described above, when a primary battery is used as a power source, the battery is replaced after the battery is consumed. At that time, the value of the capacitance C changes due to individual differences between the batteries, and in some cases, the resonance frequency of the electrodes shifts, leading to deterioration in communication performance.
In the communication terminal 901 described above, even when a secondary battery that does not assume battery replacement is used as the power source, the distance between the battery and the signal electrode 910 changes due to the change in battery thickness due to repeated charge and discharge. As a result, the value of the capacitance C generated between the signal electrode 910 and the battery is changed, which also leads to deterioration in communication performance.

特に、通信端末は、薄型化しており、信号電極と電池との間隔を近くするほど、その影響を受けやすくなる。
また、上述の電池のような導体の場合だけでなく、着脱可能な記憶媒体（例えば、メモリカード）のような誘電体を有する場合についても同様に、通信端末９０１の通信性能に影響を受ける場合がある。
そこで、本発明は、搭載した電池やメモリカード等の容量形成体による通信への影響を抑えた通信端末を提供することを目的とする。 In particular, the communication terminal is thin, and the closer the distance between the signal electrode and the battery is, the more easily it is affected.
Similarly, in the case of having a dielectric such as a removable storage medium (for example, a memory card) as well as a conductor such as the battery described above, the communication performance of the communication terminal 901 is similarly affected. There is.
Therefore, an object of the present invention is to provide a communication terminal in which the influence on communication by a capacity forming body such as an installed battery or memory card is suppressed.

本発明は、以下のような解決手段により、前記課題を解決する。なお、理解を容易にするために、本発明の実施形態に対応する符号を付して説明するが、これに限定されるものではない。また、符号を付して説明した構成は、適宜改良してもよく。また、少なくとも一部を他の構成物に代替してもよい。   The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to embodiment of this invention is attached | subjected and demonstrated, it is not limited to this. In addition, the configuration described with reference numerals may be improved as appropriate. Moreover, you may substitute at least one part for another structure.

第１の発明は、基準電極（２）に対向する位置に設けられる面状の信号電極（１０，２１０，３１０）と、前記基準電極と前記信号電極との電位差による電気信号の通信を、伝達可能な通信媒体を介して行う通信部（６）と、前記信号電極に対向するようにして設けられた導体又は誘電体である容量形成体（４，３０５）と、を備え、前記信号電極は、電気を通す導電部（１１，２１１，３１１）と、電気を通さない非導電部（１２，２１２，３１２）とを有し、対向する前記容量形成体に重なる領域の少なくとも一部に、非導電部が形成されている、通信端末（１，２０１，３０１）である。
第２の発明は、第１の発明の通信端末（１−２）において、前記非導電部（１２）は、切り欠き部である、通信端末である。
第３の発明は、第１の発明又は第２の発明の通信端末（１，２０１）において、前記非導電部（１２，２１２）は、前記信号電極（１０，２１０）に導通していない非導通部（１４，２１４）を有する、通信端末である。
第４の発明は、第１の発明から第３の発明までのいずれかの通信端末（１，２０１，３０１）において、前記容量形成体は、電池（４，３０５）である、通信端末である。
第５の発明は、第４の発明の通信端末（２０１）において、前記非導電部（１２）に、前記容量形成体（４）に接続された電池接触部（２１５）を有する、通信端末である。 In the first invention, a planar signal electrode (10, 210, 310) provided at a position facing the reference electrode (2) and communication of an electric signal due to a potential difference between the reference electrode and the signal electrode are transmitted. A communication unit (6) that performs via a possible communication medium, and a capacitance forming body (4,305) that is a conductor or a dielectric provided so as to face the signal electrode. , Having conductive portions (11, 211, 311) that conduct electricity and non-conductive portions (12, 212, 312) that do not conduct electricity, and at least part of a region that overlaps the opposing capacitance forming body, A communication terminal (1, 201, 301) in which a conductive portion is formed.
2nd invention is a communication terminal in which the said nonelectroconductive part (12) is a notch part in the communication terminal (1-2) of 1st invention.
According to a third aspect of the present invention, in the communication terminal (1, 201) of the first aspect or the second aspect, the non-conductive portion (12, 212) is not electrically connected to the signal electrode (10, 210). It is a communication terminal which has a conduction | electrical_connection part (14,214).
A fourth invention is the communication terminal according to any one of the communication terminals (1, 201, 301) from the first invention to the third invention, wherein the capacity forming body is a battery (4,305). .
A fifth invention is a communication terminal (201) according to the fourth invention, wherein the non-conductive part (12) has a battery contact part (215) connected to the capacity forming body (4). is there.

本発明によれば、搭載した電池やメモリカード等の容量形成体による通信への影響を抑えた通信端末を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the communication terminal which suppressed the influence on communication by capacity | capacitance formation bodies, such as a mounted battery and a memory card, can be provided.

第１実施形態に係る通信端末を示す図である。It is a figure which shows the communication terminal which concerns on 1st Embodiment. 第１実施形態に係る他の通信端末を示す図である。It is a figure which shows the other communication terminal which concerns on 1st Embodiment. 第１実施形態に係る他の通信端末を示す図である。It is a figure which shows the other communication terminal which concerns on 1st Embodiment. 第１実施形態に係る他の通信端末を示す図である。It is a figure which shows the other communication terminal which concerns on 1st Embodiment. 第１実施形態に係る他の通信端末を示す図である。It is a figure which shows the other communication terminal which concerns on 1st Embodiment. 第２実施形態に係る通信端末を示す図である。It is a figure which shows the communication terminal which concerns on 2nd Embodiment. 第２実施形態に係る他の通信端末を示す図である。It is a figure which shows the other communication terminal which concerns on 2nd Embodiment. 第３実施形態に係る通信端末を示す図である。It is a figure which shows the communication terminal which concerns on 3rd Embodiment. 従来の通信端末を示す図である。It is a figure which shows the conventional communication terminal.

以下、本発明を実施するための形態について、図を参照しながら説明する。なお、これは、あくまでも一例であって、本発明の技術的範囲はこれに限られるものではない。
（第１実施形態）
図１は、第１実施形態に係る通信端末１を示す図である。図１（Ａ）は、通信端末１の厚み方向Ｚに平行な断面における断面模式図である。図１（Ｂ）は、図１（Ａ）のＡ−Ａ矢視図である。図１を以下に説明する各図において、通信端末の厚み方向をＺ方向とし、それに直交する方向のうち、通信端末の長手方向をＸ方向、短手方向をＹ方向とする。
図１（Ａ）に示す通信端末１は、電界通信の機能を有する。通信端末１は、例えば、ＩＣタグ（不図示）に記憶されたＩＤ（ＩＤｅｎｔｉｆｉｃａｔｉｏｎ）情報を、電界通信を介して外部装置（不図示）に送信する。なお、ＩＣタグは、ＩＣチップとして後述の基板３上に設けられるようにしてもよく、また、通信端末１とは別体のカード内に設けられ、ＩＤ情報を非接触通信により通信端末１に送信するようにしてもよい。 DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. This is merely an example, and the technical scope of the present invention is not limited to this.
(First embodiment)
FIG. 1 is a diagram illustrating a communication terminal 1 according to the first embodiment. FIG. 1A is a schematic cross-sectional view in a cross section parallel to the thickness direction Z of the communication terminal 1. FIG. 1B is a view taken in the direction of arrows AA in FIG. In each drawing described below with reference to FIG. 1, the thickness direction of the communication terminal is the Z direction, and among the directions orthogonal to the thickness direction, the longitudinal direction of the communication terminal is the X direction and the short direction is the Y direction.
A communication terminal 1 illustrated in FIG. 1A has a function of electric field communication. For example, the communication terminal 1 transmits ID (IDentification) information stored in an IC tag (not shown) to an external device (not shown) via electric field communication. The IC tag may be provided as an IC chip on a substrate 3 to be described later, or provided in a card separate from the communication terminal 1, and ID information is transferred to the communication terminal 1 by non-contact communication. You may make it transmit.

通信端末１は、箱枠形状の筐体２０により構成される。
筐体２０の内部には、Ｚ方向上部に信号電極１０を備え、Ｚ方向下部に基準電極２を備える。信号電極１０と、基準電極２とは、筐体２０の厚さ方向Ｚにおいて、平行に設置されている。ここで、平行とは、厳密な意味での平行のみではなく、信号電極１０と、基準電極２とが接触しない範囲において平行ではない状態をも含む。
ここで、図１では、配線等の図示を省略すると共に、通信端末１の内部に配置された主要な電子部品のみに符号を付している。
基準電極２は、面状であり、例えば、一般的なプリント基板や、金属箔等のシートにより構成される。ここで、面状は、数学的な意味での厳密な面を意味するものではなく、電極としての厚みを有するものを含む意味である。また、面状には、平面や曲面といった形状をも含む。 The communication terminal 1 is configured by a box-shaped housing 20.
Inside the housing 20, the signal electrode 10 is provided in the upper part in the Z direction, and the reference electrode 2 is provided in the lower part in the Z direction. The signal electrode 10 and the reference electrode 2 are installed in parallel in the thickness direction Z of the housing 20. Here, the term “parallel” includes not only parallel in a strict sense but also a state in which the signal electrode 10 and the reference electrode 2 are not parallel in a range where they do not contact each other.
Here, in FIG. 1, illustration of wiring and the like is omitted, and only the main electronic components arranged inside the communication terminal 1 are denoted by reference numerals.
The reference electrode 2 has a planar shape, and is composed of, for example, a general printed board or a sheet such as a metal foil. Here, the planar shape does not mean a strict surface in a mathematical sense, but includes a thickness having an electrode thickness. Further, the planar shape includes shapes such as a flat surface and a curved surface.

基板３は、基準電極２に重ねて、基準電極２のＺ方向上側に配置される。基板３は、例えば、コントロール基板である。基板３には、電池４（容量形成体）、電界通信部６（通信部）、信号接続部７等が配置されている。
電池４は、ボタン電池等の一次電池である。
電界通信部６は、送信する情報に応じて変調された信号を、信号電極１０に供給して、人体の近傍に変調電界を誘起させ、人体（通信媒体）を介して外部機器との間で電界通信を行う。具体的には、電界通信部６は、基準電極２と、信号電極１０との間の電位差による電気信号によって通信を行う。電界通信部６は、電界通信インタフェース、電界通信制御ドライバ等（いずれも不図示）により構成される。
信号接続部７は、信号電極１０と、電界通信部６とを電気的に接続する。 The substrate 3 is arranged on the upper side of the reference electrode 2 in the Z direction so as to overlap the reference electrode 2. The substrate 3 is, for example, a control substrate. On the substrate 3, a battery 4 (capacity forming body), an electric field communication unit 6 (communication unit), a signal connection unit 7 and the like are arranged.
The battery 4 is a primary battery such as a button battery.
The electric field communication unit 6 supplies a signal modulated according to information to be transmitted to the signal electrode 10 to induce a modulated electric field in the vicinity of the human body, and between the external device via the human body (communication medium). Conduct electric field communication. Specifically, the electric field communication unit 6 performs communication using an electric signal due to a potential difference between the reference electrode 2 and the signal electrode 10. The electric field communication unit 6 includes an electric field communication interface, an electric field communication control driver, and the like (all not shown).
The signal connection unit 7 electrically connects the signal electrode 10 and the electric field communication unit 6.

なお、基板３には、図示しない制御部を有する。制御部は、電界通信部６における通信や、その他の動作を制御する。制御部は、ＭＰＵ（Ｍｉｃｒｏ−Ｐｒｏｃｅｓｓｉｎｇ Ｕｎｉｔ）、メモリ等により構成される。制御部のメモリには、電界通信部６による電界通信を行うためのアプリケーションソフトが記憶されている。
また、この例では、基準電極２と基板３とが別々のものとして記載しているが、基板３のグランドを、基準電極２としてもよい。 The substrate 3 has a control unit (not shown). The control unit controls communication in the electric field communication unit 6 and other operations. The control unit includes an MPU (Micro-Processing Unit), a memory, and the like. In the memory of the control unit, application software for performing electric field communication by the electric field communication unit 6 is stored.
In this example, the reference electrode 2 and the substrate 3 are described as being separate, but the ground of the substrate 3 may be used as the reference electrode 2.

図１（Ｂ）に示すように、信号電極１０は、面状であり、導電部１１と、非導電部１２とにより構成される。なお、信号電極１０についても基準電極２と同様に、面状は、電極としての厚みを有するものを含む。
導電部１１は、信号電極パターンを有するものであり、例えば、一般的なプリント基板や、金属箔等のシートにより構成される。
非導電部１２は、信号電極パターンを有さず、非導電の材料により形成された基材により構成される。
ここで、信号電極１０において電池４（Ｙ方向に並んで２つ配置されている。）に重なる領域である電池領域１３は、非導電部１２により形成されている。このような構成により、電池４と、信号電極１０との間の静電容量Ｃは、発生せず、ほぼ０とみなせる。よって、通信端末１は、電池４を交換等したことによる電池４の個体差を考慮しなくて済み、静電容量の変化が起因となる通信性能の劣化を防ぐことができる。 As shown in FIG. 1B, the signal electrode 10 has a planar shape and includes a conductive portion 11 and a nonconductive portion 12. As for the signal electrode 10, like the reference electrode 2, the planar shape includes those having a thickness as an electrode.
The conductive part 11 has a signal electrode pattern, and is configured by, for example, a general printed board or a sheet of metal foil or the like.
The nonconductive part 12 does not have a signal electrode pattern, and is configured by a base material formed of a nonconductive material.
Here, in the signal electrode 10, the battery region 13, which is a region overlapping with the battery 4 (two are arranged side by side in the Y direction), is formed by the non-conductive portion 12. With such a configuration, the capacitance C between the battery 4 and the signal electrode 10 is not generated and can be regarded as almost zero. Therefore, the communication terminal 1 does not need to consider the individual difference of the battery 4 due to the replacement of the battery 4, and can prevent the deterioration of the communication performance caused by the change in capacitance.

次に、通信端末１の他の例について、図２から図５に基づき説明する。
図２から図５までは、第１実施形態に係る他の通信端末１を示す図であり、図１に対応する図である。 Next, another example of the communication terminal 1 will be described with reference to FIGS.
2 to 5 are diagrams showing another communication terminal 1 according to the first embodiment and corresponding to FIG.

（他の実施例１）
図２（Ａ）に示す通信端末１−１は、信号電極１０−１が、導電部１１−１のみにより構成されている。また、図２（Ｂ）に示すように、信号電極１０−１は、電池領域１３を含まないように構成され、図１に比較して面積が小さい。つまり、信号電極１０−１は、非導電部１２を、電池領域１３を切り欠いた切り欠き部として構成するものである。
この場合、通信端末１−１における電池４と、信号電極１０−１との間の静電容量Ｃは、信号電極１０−１が電池４に重なる領域を有さないので、上述した実施例の通信端末１（図１（Ａ））と同様に、ほぼ０とみなせる。よって、通信端末１−１は、電池４を交換等したことによる通信性能の劣化を防ぐことができる。
なお、信号電極１０−１の導電部１１−１と、信号電極１０の導電部１１とは、その面積及び配置位置がほぼ同じであるので、電界通信の通信性能は、通信端末１と、通信端末１−１とにおいて、ほぼ同じになる。 (Other Example 1)
In the communication terminal 1-1 illustrated in FIG. 2A, the signal electrode 10-1 is configured only by the conductive portion 11-1. Further, as shown in FIG. 2B, the signal electrode 10-1 is configured not to include the battery region 13, and has a smaller area than that of FIG. That is, the signal electrode 10-1 configures the non-conductive part 12 as a notch part in which the battery region 13 is notched.
In this case, since the capacitance C between the battery 4 and the signal electrode 10-1 in the communication terminal 1-1 does not have a region where the signal electrode 10-1 overlaps the battery 4, the above-described embodiment. Similar to the communication terminal 1 (FIG. 1A), it can be regarded as almost zero. Therefore, the communication terminal 1-1 can prevent deterioration of communication performance due to replacement of the battery 4 or the like.
Since the conductive portion 11-1 of the signal electrode 10-1 and the conductive portion 11 of the signal electrode 10 have substantially the same area and arrangement position, the communication performance of electric field communication is the same as that of the communication terminal 1. The terminal 1-1 is almost the same.

（他の実施例２）
図３（Ａ）に示す通信端末１−２は、信号電極１０−２が、導電部１１−２と、非導電部１２−２とにより構成されている。また、図３（Ｂ）に示すように、導電部１１−２は、電池領域１３を避けるようにして、電池領域１３をくり抜いた形状である。そして、非導電部１２−２は、導電部１１−２がくり抜かれた電池領域１３に対応する位置に設けられ、電池領域１３とほぼ同じ大きさ及び形状である。
この場合、通信端末１−２における電池４と、信号電極１０−２との間の静電容量Ｃは、電池領域１３が非導電部１２−２になっているので、上述した実施例の通信端末１（図１（Ａ））と同様に、ほぼ０とみなせる。よって、通信端末１−２は、電池４を交換等したことによる通信性能の劣化を防ぐことができる。
また、信号電極１０−２の導電部１１−２と、信号電極１０の導電部１１（図１（Ｂ））を比較すると、信号電極１０−２の導電部１１−２は、信号電極１０の導電部１１より面積が大きい。よって、通信端末１−２は、通信端末１（図１（Ａ））よりも電界通信の通信性能を向上させることができる。 (Other Example 2)
In the communication terminal 1-2 shown in FIG. 3A, the signal electrode 10-2 includes a conductive portion 11-2 and a nonconductive portion 12-2. Further, as shown in FIG. 3B, the conductive portion 11-2 has a shape in which the battery region 13 is cut out so as to avoid the battery region 13. The non-conductive portion 12-2 is provided at a position corresponding to the battery region 13 from which the conductive portion 11-2 is hollowed out, and has substantially the same size and shape as the battery region 13.
In this case, the capacitance C between the battery 4 and the signal electrode 10-2 in the communication terminal 1-2 is such that the battery region 13 is a non-conductive portion 12-2. Similar to the terminal 1 (FIG. 1A), it can be regarded as almost zero. Therefore, the communication terminal 1-2 can prevent deterioration of communication performance due to replacement of the battery 4 or the like.
Further, when comparing the conductive portion 11-2 of the signal electrode 10-2 with the conductive portion 11 of the signal electrode 10 (FIG. 1B), the conductive portion 11-2 of the signal electrode 10-2 is The area is larger than that of the conductive portion 11. Therefore, the communication terminal 1-2 can improve the communication performance of electric field communication compared with the communication terminal 1 (FIG. 1 (A)).

上述した通信端末１−２の信号電極１０−２は、導電部１１−２が、電池領域１３を避けるようにして、電池領域１３をくり抜いた形状であった。また、非導電部１２−２が、導電部１１−２がくり抜かれた電池領域１３に対応する位置に設けられ、電池領域１３とほぼ同じ大きさ及び形状であった。しかし、通信端末１−２の信号電極１０−２は、導電部１１−２が、電池領域１３を避けるようにして設けられていればよく、非導電部１２−２の形状も電池領域１３とほぼ同じ大きさ及び形状でなくてもよい。
図３（Ｃ）は、信号電極１０−２の変形例である信号電極１０−２ａを示す。この例では、導電部１１−２ａは、電池領域１３を避けるようにして設けられている。また、非導電部１２−２ａは、電池領域１３を含むように形成され、その形状は、矩形である。このように、非導電部１２−２ａは、電池領域１３よりも大きくてもよい。また、非導電部１２−２ａの形状は、その他、楕円形上や多角形状等、任意である。 The signal electrode 10-2 of the communication terminal 1-2 described above has a shape in which the conductive portion 11-2 is cut out from the battery region 13 so as to avoid the battery region 13. Moreover, the non-conductive part 12-2 was provided in the position corresponding to the battery area | region 13 where the conductive part 11-2 was hollowed out, and was the substantially the same magnitude | size and shape as the battery area | region 13. FIG. However, the signal electrode 10-2 of the communication terminal 1-2 only needs to be provided so that the conductive portion 11-2 avoids the battery region 13, and the shape of the nonconductive portion 12-2 is also the same as that of the battery region 13. It does not have to be approximately the same size and shape.
FIG. 3C shows a signal electrode 10-2a which is a modification of the signal electrode 10-2. In this example, the conductive portion 11-2a is provided so as to avoid the battery region 13. Moreover, the non-conductive part 12-2a is formed so as to include the battery region 13, and the shape thereof is a rectangle. Thus, the non-conductive portion 12-2a may be larger than the battery region 13. In addition, the shape of the non-conductive portion 12-2a is arbitrary such as an elliptical shape or a polygonal shape.

（他の実施例３）
図４（Ａ）に示す通信端末１−３は、信号電極１０−３が、導電部１１−３と、非導電部１２−３とにより構成されている。また、図４（Ｂ）に示すように、導電部１１−３は、電池領域１３の一部を円状にくり抜いた残りの部分であるため、電池領域１３の一部領域を含まない。そして、非導電部１２−３は、導電部１１−３を有さない電池領域１３の一部領域である。
この場合、通信端末１−３における電池４と、信号電極１０−３との間には、電池領域１３と、導電部１１−３とが重複した部分で、静電容量Ｃが発生する。しかし、電池領域１３の一部に非導電部１２−３があるため、非導電部１２−３がある分だけ、静電容量Ｃの発生を抑えることができる。ここで、非導電部１２−３の面積は、電池領域１３の面積の約１／４以上である場合に、通信機能の劣化を防ぐ程度に静電容量Ｃを下げる効果がある。
なお、この例では、非導電部１２−３を円状のものであるとして説明したが、形状は、矩形状や多角形状等、任意である。また、電池領域１３と、導電部１１−３との重複部分は、例えば、網状に形成してもよく、その場合には、非導電部１２−３は、網目にすればよい。 (Other Example 3)
In the communication terminal 1-3 illustrated in FIG. 4A, the signal electrode 10-3 includes a conductive portion 11-3 and a nonconductive portion 12-3. Further, as shown in FIG. 4B, the conductive portion 11-3 is a remaining portion obtained by hollowing out a part of the battery region 13, and thus does not include a partial region of the battery region 13. And the non-conductive part 12-3 is a partial area | region of the battery area | region 13 which does not have the conductive part 11-3.
In this case, a capacitance C is generated between the battery 4 and the signal electrode 10-3 in the communication terminal 1-3 at a portion where the battery region 13 and the conductive portion 11-3 overlap. However, since the non-conductive portion 12-3 is present in a part of the battery region 13, the generation of the capacitance C can be suppressed by the amount of the non-conductive portion 12-3. Here, when the area of the non-conductive portion 12-3 is about ¼ or more of the area of the battery region 13, there is an effect of reducing the capacitance C to the extent that the deterioration of the communication function is prevented.
In this example, the non-conductive portion 12-3 has been described as having a circular shape, but the shape is arbitrary, such as a rectangular shape or a polygonal shape. In addition, the overlapping portion between the battery region 13 and the conductive portion 11-3 may be formed in a net shape, for example, and in that case, the non-conductive portion 12-3 may be a mesh.

（他の実施例４）
図５（Ａ）に示す通信端末１−４は、信号電極１０−４が導電部１１−４と、非導電部１２−４とにより構成されている。また、図５（Ｂ）に示すように、導電部１１−４は、上述の他の実施例２（図３参照）と同様に、電池領域１３を避けるようにして、電池領域１３の外周円より外側に形成されている。非導電部１２−４は、導電部１１−４がくり抜かれた電池領域１３に対応する位置に設けられ、電池領域１３とほぼ同じ大きさ及び形状である。
この非導電部１２−４には、非導電部１２−４の外周よりも内側に、導電部１１−４に導通してしない非導通部１４が円状に設けられている。この非導通部１４は、例えば、導電部１１−４と同じ基材により構成されている。
この場合、通信端末１−４における電池４と、信号電極１０−４との間の静電容量Ｃは、非導通部１４が非導電部１２−４と同様の働きをするため、上述した実施例の通信端末１（図１（Ａ））と同様に、ほぼ０とみなせる。よって、通信端末１−４は、電池４を交換等したことによる通信性能の劣化を防ぐことができる。
また、例えば、筐体２０が透明である場合等、信号電極１０−４を外観から視認可能な場合には、信号電極１０−４は、外見上は、導電部１１−４と、非導通部１４との信号電極パターンが一体になっているように見えるため、見た目に区別が分かりづらいものにできる。 (Other Example 4)
In the communication terminal 1-4 shown in FIG. 5A, the signal electrode 10-4 includes a conductive portion 11-4 and a nonconductive portion 12-4. Further, as shown in FIG. 5 (B), the conductive portion 11-4 is arranged so as to avoid the battery region 13 in the same manner as in the other embodiment 2 described above (see FIG. 3). It is formed on the outer side. The non-conductive portion 12-4 is provided at a position corresponding to the battery region 13 from which the conductive portion 11-4 is cut out, and has substantially the same size and shape as the battery region 13.
The non-conductive portion 12-4 is provided with a circular non-conductive portion 14 that does not conduct to the conductive portion 11-4 inside the outer periphery of the non-conductive portion 12-4. This non-conduction part 14 is comprised by the same base material as the electroconductive part 11-4, for example.
In this case, the capacitance C between the battery 4 and the signal electrode 10-4 in the communication terminal 1-4 has the above-described implementation because the non-conductive portion 14 functions in the same manner as the non-conductive portion 12-4. Similar to the example communication terminal 1 (FIG. 1A), it can be regarded as almost zero. Therefore, the communication terminal 1-4 can prevent deterioration in communication performance due to replacement of the battery 4 or the like.
For example, when the signal electrode 10-4 is visible from the outside, such as when the housing 20 is transparent, the signal electrode 10-4 is externally connected to the conductive portion 11-4. Since the signal electrode patterns 14 and 14 appear to be integrated with each other, it is difficult to distinguish visually.

上述した第１実施形態の通信端末１によれば、以下のような効果を奏する。
通信端末１の信号電極１０は、電池４に重なる電池領域１３の少なくとも一部に非導電部１２を有する。よって、信号電極１０と、電池４との間に生じる静電容量Ｃを、通信性能を劣化させない程度に抑えることができ、電池４の個体差による静電容量Ｃの値の変化を吸収できる。 According to the communication terminal 1 of 1st Embodiment mentioned above, there exist the following effects.
The signal electrode 10 of the communication terminal 1 has a non-conductive portion 12 in at least a part of the battery region 13 that overlaps the battery 4. Therefore, the capacitance C generated between the signal electrode 10 and the battery 4 can be suppressed to the extent that the communication performance is not deteriorated, and the change in the value of the capacitance C due to the individual difference of the batteries 4 can be absorbed.

（第２実施形態）
次に、第１実施形態と通信端末の構成が異なる第２実施形態について説明する。なお、以降の説明において、上述した第１実施形態と同様の機能を果たす部分には、同一の符号又は末尾に同一の符号を付して、重複する説明を適宜省略する。
図６は、第２実施形態に係る通信端末２０１を示す図である。図６（Ａ）は、通信端末２０１の厚み方向Ｚに平行な断面における断面模式図である。図６（Ｂ）は、図６（Ａ）のＡ−Ａ矢視図である。
図６（Ａ）に示すように、通信端末２０１は、通信端末１（図１（Ａ））と比較して、電池４が設けられる位置が異なる。電池４は、信号電極２１０上（−Ｚ側）に設けられている。そのため、通信端末２０１は、電池４の電流を電界通信部６等に供給するための電源接続部２０８を備える。また、図６（Ｂ）に示すように、信号電極２１０は、導電部２１１と、非導電部２１２と、電池接触部２１５とにより構成されている。電源接続部２０８は、電池接触部２１５を介して電池４に電気的に接続されている。導電部２１１は、上述の第１実施形態の他の実施例２（図３参照）とほぼ同様に、電池領域１３を含まず、電池領域１３をくり抜いた残りの部分である。非導電部２１２は、導電部２１１を有さない領域であり、電池領域１３とほぼ同じ大きさ及び形状になっている。電池接触部２１５は、非導電部２１２の領域に設けられている。
この場合、通信端末２０１は、電池４に重なる位置に、導電部２１１を有さない。そのため、通信端末２０１における電池４と、信号電極２１０との間の静電容量Ｃは、上述した実施例の通信端末１（図１（Ａ））と同様に、ほぼ０とみなせる。よって、通信端末２０１は、電池４を交換等したことによる通信性能の劣化を防ぐことができる。
なお、電源接続部２０８は、信号電極２１０の導電部２１１の一部を横切ることになるが、図６（Ｂ）に示すように、導電部２１１とは導通しないように、導電部２１１が電源接続部２０８を避けるようにして形成されている。 (Second Embodiment)
Next, a second embodiment in which the configuration of the communication terminal is different from the first embodiment will be described. In the following description, parts that perform the same functions as those in the first embodiment described above are given the same reference numerals or the same reference numerals at the end, and redundant descriptions are omitted as appropriate.
FIG. 6 is a diagram illustrating the communication terminal 201 according to the second embodiment. FIG. 6A is a schematic cross-sectional view in a cross section parallel to the thickness direction Z of the communication terminal 201. FIG. 6B is a view taken in the direction of arrows AA in FIG.
As shown in FIG. 6A, the communication terminal 201 is different from the communication terminal 1 (FIG. 1A) in the position where the battery 4 is provided. The battery 4 is provided on the signal electrode 210 (−Z side). Therefore, the communication terminal 201 includes a power supply connection unit 208 for supplying the current of the battery 4 to the electric field communication unit 6 and the like. As shown in FIG. 6B, the signal electrode 210 includes a conductive portion 211, a nonconductive portion 212, and a battery contact portion 215. The power supply connection unit 208 is electrically connected to the battery 4 via the battery contact unit 215. The conductive part 211 does not include the battery region 13 and is the remaining part of the battery region 13 that is cut out, as in the second example (see FIG. 3) of the first embodiment. The nonconductive portion 212 is a region that does not have the conductive portion 211 and has substantially the same size and shape as the battery region 13. Battery contact portion 215 is provided in the region of non-conductive portion 212.
In this case, the communication terminal 201 does not have the conductive portion 211 at a position overlapping the battery 4. For this reason, the capacitance C between the battery 4 and the signal electrode 210 in the communication terminal 201 can be regarded as almost zero as in the communication terminal 1 (FIG. 1A) of the above-described embodiment. Therefore, the communication terminal 201 can prevent deterioration in communication performance due to replacement of the battery 4 or the like.
Note that the power supply connection portion 208 crosses a part of the conductive portion 211 of the signal electrode 210, but the conductive portion 211 is connected to the power source so as not to be electrically connected to the conductive portion 211 as shown in FIG. It is formed so as to avoid the connecting portion 208.

（他の実施例）
次に、通信端末２０１に有する信号電極２１０の他の例について、図７に基づき説明する。
図７は、第２実施形態に係る通信端末２０１を示す図であり、図６に対応する図である。なお、図７（Ｂ）において、電源接続部２０８の図示は省略している。 (Other examples)
Next, another example of the signal electrode 210 included in the communication terminal 201 will be described with reference to FIG.
FIG. 7 is a diagram illustrating the communication terminal 201 according to the second embodiment, and corresponds to FIG. In FIG. 7B, the power supply connection portion 208 is not shown.

図７（Ａ）に示す通信端末２０１−１は、上述した通信端末２０１と同様に、電池４が信号電極２１０上（−Ｚ側）に設けられたものである。そして、図７（Ｂ）に示すように、信号電極２１０−１は、導電部２１１−１と、非導電部２１２−１とにより構成されている。導電部２１１−１は、上述の第１実施形態の他の実施例２（図３参照）とほぼ同様に、電池領域１３を含まず、電池領域１３をくり抜いた残りの部分である。非導電部２１２−１は、導電部２１１−１がくり抜かれた電池領域１３に対応する位置に設けられ、電池領域１３とほぼ同じ大きさ及び形状である。
この非導電部２１２−１には、非導電部２１２−１の外周よりも内側に、導電部２１１−１に導通してしない非導通部２１４と、電池接触部２１５とを有する。非導通部２１４は、例えば、導電部２１１−１と同じ基材により構成されている。非導通部２１４と、電池接触部２１５とは、互いに接していない。つまり、非導通部２１４と、電池接触部２１５は、非導電部２１２−１によって囲まれている。
この場合であっても、通信端末２０１−１における電池４と、信号電極２１０−１との間の静電容量Ｃは、上述した実施例の通信端末２０１（図６）と同様に、ほぼ０とみなせる。よって、通信端末２０１は、電池４を交換等したことによる通信性能の劣化を防ぐことができる。また、通信端末２０１−１は、上述した通信端末１−４（図５）と同様に、例えば、筐体２０が透明である場合等、信号電極２１０−１を外観から視認可能な場合には、信号電極２１０−１は、外見上は、導電部２１１−１と、非導通部２１４と、電池接触部２１５との信号電極パターンが一体になっているように見えるため、見た目には区別が分かりづらいものにできる。 In the communication terminal 201-1 shown in FIG. 7A, the battery 4 is provided on the signal electrode 210 (on the −Z side), similarly to the communication terminal 201 described above. As shown in FIG. 7B, the signal electrode 210-1 is composed of a conductive portion 211-1 and a nonconductive portion 212-1. The conductive part 211-1 does not include the battery region 13 and is the remaining part of the battery region 13 that is cut out, as in the second example (see FIG. 3) of the first embodiment described above. The non-conductive portion 212-1 is provided at a position corresponding to the battery region 13 where the conductive portion 211-1 is hollowed out, and has approximately the same size and shape as the battery region 13.
The non-conductive part 212-1 has a non-conductive part 214 that is not conductive to the conductive part 211-1 and a battery contact part 215 inside the outer periphery of the non-conductive part 212-1. The non-conduction part 214 is comprised by the same base material as the electroconductive part 211-1, for example. The non-conduction part 214 and the battery contact part 215 are not in contact with each other. That is, the non-conductive part 214 and the battery contact part 215 are surrounded by the non-conductive part 212-1.
Even in this case, the capacitance C between the battery 4 and the signal electrode 210-1 in the communication terminal 201-1 is substantially 0, as in the communication terminal 201 (FIG. 6) of the above-described embodiment. Can be considered. Therefore, the communication terminal 201 can prevent deterioration in communication performance due to replacement of the battery 4 or the like. Similarly to the communication terminal 1-4 (FIG. 5) described above, the communication terminal 201-1 may be visible when the signal electrode 210-1 is visible from the outside, for example, when the housing 20 is transparent. The signal electrode 210-1 appears to be integrated with the signal electrode pattern of the conductive portion 211-1, the non-conductive portion 214, and the battery contact portion 215 in appearance. It can be difficult to understand.

上述した第２実施形態の通信端末２０１によれば、以下のような効果を奏する。
通信端末２０１の信号電極２１０は、電池４を有するが、電池領域１３の少なくとも外周を、信号電極パターンを有さない非導電部２１２により構成し、電池領域１３には、導電部２１１を有さない。よって、信号電極２１０と、電池４との間の静電容量Ｃを低減でき、電界通信の通信性能の劣化を防ぐことができる。結果として、電池４の個体の差による電池の厚み変化を考慮することなく、どのような電池４であっても使用できる。 The communication terminal 201 according to the second embodiment described above has the following effects.
The signal electrode 210 of the communication terminal 201 includes the battery 4, but at least the outer periphery of the battery region 13 is configured by the nonconductive portion 212 that does not have the signal electrode pattern, and the battery region 13 includes the conductive portion 211. Absent. Therefore, the electrostatic capacitance C between the signal electrode 210 and the battery 4 can be reduced, and deterioration of the communication performance of electric field communication can be prevented. As a result, any battery 4 can be used without considering the change in thickness of the battery due to the difference between the individual batteries 4.

（第３実施形態）
次に、上述した各１実施形態と通信端末の構成が異なる第３実施形態について説明する。
図８は、第３実施形態に係る通信端末３０１を示す図である。図８（Ａ）は、通信端末３０１の厚み方向Ｚに平行な断面における断面模式図である。図８（Ｂ）は、図８（Ａ）のＡ−Ａ矢視図である。 (Third embodiment)
Next, a third embodiment in which the configuration of the communication terminal is different from each of the above-described first embodiments will be described.
FIG. 8 is a diagram illustrating a communication terminal 301 according to the third embodiment. FIG. 8A is a schematic cross-sectional view in a cross section parallel to the thickness direction Z of the communication terminal 301. FIG. 8B is an AA arrow view of FIG.

図８（Ａ）に示す通信端末３０１は、上述した通信端末１−２（図３）とほぼ同様であるが、外部より繰り返し充電可能な二次電池である電池３０５を用いている点で、第１実施形態と異なる。電池３０５は、例えば、リチウム電池である。
図８（Ｂ）に示すように、信号電極３１０は、導電部３１１と、非導電部３１２とにより構成される。導電部３１１は、電池３０５に重なる領域である電池領域３１３を含まず、電池領域３１３をくり抜いた残りの部分である。また、非導電部３１２は、導電部３１１を有さない領域であり、電池領域３１３とほぼ同じ大きさ及び形状になっている。
この場合、通信端末３０１における電池３０５と、信号電極３１０との間の静電容量Ｃは、上述した実施例の通信端末１−２（図３）と同様に、ほぼ０とみなせる。よって、通信端末３０１は、電池３０５の充放電の繰り返しによる電池の厚み変化によって変化する、静電容量の変化が起因となる通信性能の劣化を防ぐことができる。 The communication terminal 301 shown in FIG. 8A is substantially the same as the communication terminal 1-2 (FIG. 3) described above, but uses a battery 305 that is a secondary battery that can be repeatedly charged from the outside. Different from the first embodiment. The battery 305 is, for example, a lithium battery.
As illustrated in FIG. 8B, the signal electrode 310 includes a conductive portion 311 and a nonconductive portion 312. The conductive portion 311 does not include the battery region 313 that overlaps the battery 305, and is the remaining part of the battery region 313 cut out. Further, the non-conductive portion 312 is a region that does not have the conductive portion 311, and has substantially the same size and shape as the battery region 313.
In this case, the electrostatic capacitance C between the battery 305 and the signal electrode 310 in the communication terminal 301 can be regarded as almost zero as in the communication terminal 1-2 (FIG. 3) of the above-described embodiment. Therefore, the communication terminal 301 can prevent deterioration in communication performance caused by a change in capacitance that changes due to a change in battery thickness due to repeated charging and discharging of the battery 305.

上述した第３実施形態の通信端末３０１によれば、以下のような効果を奏する。
通信端末３０１の信号電極３１０は、電池領域３１３を、信号電極パターンを有さない非導電部３１２により構成する。よって、信号電極３１０と、電池３０５との間の静電容量Ｃを低減でき、電界通信の通信性能の劣化を防ぐことができる。結果として、電池３０５の充放電による電池の厚み変化を考慮することなく、どのような電池３０５であっても、継続して使用できる。 According to the communication terminal 301 of 3rd Embodiment mentioned above, there exist the following effects.
In the signal electrode 310 of the communication terminal 301, the battery region 313 is configured by a non-conductive portion 312 that does not have a signal electrode pattern. Therefore, the electrostatic capacitance C between the signal electrode 310 and the battery 305 can be reduced, and deterioration in communication performance of electric field communication can be prevented. As a result, any battery 305 can be used continuously without considering the change in battery thickness due to charging / discharging of the battery 305.

以上、本発明の実施形態について説明したが、本発明は、上述した実施形態に限定されるものではない。また、実施形態に記載した効果は、本発明から生じる最も好適な効果を列挙したに過ぎず、実施形態に記載したものに限定されない。なお、上述した実施形態及び後述する変形形態は、適宜に組み合わせて用いることもできるが、詳細な説明は省略する。   As mentioned above, although embodiment of this invention was described, this invention is not limited to embodiment mentioned above. In addition, the effects described in the embodiments are merely a list of the most preferable effects resulting from the present invention, and are not limited to those described in the embodiments. In addition, although embodiment mentioned above and the deformation | transformation form mentioned later can also be used in combination suitably, detailed description is abbreviate | omitted.

（変形形態）
（１）各実施形態では、電池と信号電極との間に生じる静電容量Ｃを、非導電部を設けることにより生じさせないようにするものを例に説明したが、これに限定されない。非導電部の位置に重ねて設けるものは、電池以外の導体や誘電体であってもよく、例えば、ＳＤ（Ｓｅｃｕｒｅ Ｄｉｇｉｔａｌ）メモリカードのようなものであっても、同様の効果を奏することができる。 (Deformation)
(1) In each embodiment, the description has been given of the example in which the electrostatic capacitance C generated between the battery and the signal electrode is not generated by providing the non-conductive portion, but the present invention is not limited to this. What is provided at the position of the non-conductive portion may be a conductor other than the battery or a dielectric, for example, even if it is a SD (Secure Digital) memory card, the same effect can be obtained. it can.

（２）各実施形態では、非導通部や、電池接触部は、導通部と同一面であるものを説明したが、これに限定されない。非導通部や、電池接触部を、別層に構成してもよい。   (2) In each embodiment, although the non-conduction part and the battery contact part demonstrated what is the same surface as a conduction | electrical_connection part, it is not limited to this. You may comprise a non-conduction part and a battery contact part in another layer.

（３）各実施形態では、非導電部の形状を、電池領域の形状と同じものを主に説明したが、これに限定されない。非導電部の形状は、電池領域の形状とは異なる形状であってもよい。   (3) In each embodiment, the shape of the non-conductive portion is mainly described as the shape of the battery region, but is not limited thereto. The shape of the non-conductive portion may be different from the shape of the battery region.

１，２０１，３０１ 通信端末
２ 基準電極
３ 基板
４，３０５ 電池
６ 電界通信部
７ 信号接続部
１０，２１０，３１０ 信号電極
１１，２１１，３１１ 導電部
１２，２１２，３１２ 非導電部
１３，３１３ 電池領域
１４，２１４ 非導通部
２０８ 電源接続部
２１５ 電池接触部 1,201,301 Communication terminal 2 Reference electrode 3 Substrate 4,305 Battery 6 Electric field communication unit 7 Signal connection unit 10, 210, 310 Signal electrode 11, 211, 311 Conductive unit 12, 212, 312 Non-conductive unit 13,313 Battery Region 14, 214 Non-conducting portion 208 Power connection portion 215 Battery contact portion

Claims (5)

基準電極に対向する位置に設けられる面状の信号電極と、
前記基準電極と前記信号電極との電位差による電気信号の通信を、伝達可能な通信媒体を介して行う通信部と、
前記信号電極に対向するようにして設けられた導体又は誘電体である容量形成体と、
を備え、
前記信号電極は、電気を通す導電部と、電気を通さない非導電部とを有し、対向する前記容量形成体に重なる領域の少なくとも一部に、非導電部が形成されている、
通信端末。 A planar signal electrode provided at a position facing the reference electrode;
A communication unit that performs communication of an electrical signal due to a potential difference between the reference electrode and the signal electrode via a communication medium that can be transmitted;
A capacitance forming body that is a conductor or a dielectric provided so as to face the signal electrode;
With
The signal electrode has a conductive part that conducts electricity and a non-conductive part that does not conduct electricity, and a non-conductive part is formed in at least a part of a region that overlaps the facing capacitor forming body.
Communication terminal. 請求項１に記載の通信端末において、
前記非導電部は、切り欠き部である、
通信端末。 The communication terminal according to claim 1,
The non-conductive part is a notch part,
Communication terminal. 請求項１又は請求項２に記載の通信端末において、
前記非導電部は、前記信号電極に導通していない非導通部を有する、
通信端末。 In the communication terminal according to claim 1 or claim 2,
The non-conductive portion has a non-conductive portion that is not conductive to the signal electrode.
Communication terminal. 請求項１から請求項３までのいずれかに記載の通信端末において、
前記容量形成体は、電池である、
通信端末。 In the communication terminal according to any one of claims 1 to 3,
The capacity forming body is a battery.
Communication terminal. 請求項４に記載の通信端末において、
前記非導電部に、前記容量形成体に接続された電池接触部を有する、
通信端末。 The communication terminal according to claim 4,
The non-conductive part has a battery contact part connected to the capacity forming body,
Communication terminal.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009017466A (en) * 2007-07-09 2009-01-22 Nippon Telegr & Teleph Corp <Ntt> Casing structure
WO2009104467A1 (en) * 2008-02-22 2009-08-27 アルプス電気株式会社 Electronic device for electric field communication
JP2009232284A (en) * 2008-03-24 2009-10-08 Nippon Telegr & Teleph Corp <Ntt> Electric field communication device
JP2012037900A (en) * 2011-09-26 2012-02-23 Nec Corp Display device

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009017466A (en) * 2007-07-09 2009-01-22 Nippon Telegr & Teleph Corp <Ntt> Casing structure
WO2009104467A1 (en) * 2008-02-22 2009-08-27 アルプス電気株式会社 Electronic device for electric field communication
JP2009232284A (en) * 2008-03-24 2009-10-08 Nippon Telegr & Teleph Corp <Ntt> Electric field communication device
JP2012037900A (en) * 2011-09-26 2012-02-23 Nec Corp Display device

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