JP3475582B2 - Non-contact high-frequency signal transmission device - Google Patents
Non-contact high-frequency signal transmission deviceInfo
- Publication number
- JP3475582B2 JP3475582B2 JP16338695A JP16338695A JP3475582B2 JP 3475582 B2 JP3475582 B2 JP 3475582B2 JP 16338695 A JP16338695 A JP 16338695A JP 16338695 A JP16338695 A JP 16338695A JP 3475582 B2 JP3475582 B2 JP 3475582B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency signal
- signal transmission
- transmission device
- substrate
- ring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 230000008054 signal transmission Effects 0.000 title claims description 22
- 239000000758 substrate Substances 0.000 claims description 41
- 239000004020 conductor Substances 0.000 claims description 27
- 230000002093 peripheral effect Effects 0.000 claims description 6
- 230000005540 biological transmission Effects 0.000 description 21
- 239000011888 foil Substances 0.000 description 14
- 239000002184 metal Substances 0.000 description 14
- 238000010586 diagram Methods 0.000 description 10
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- 230000001939 inductive effect Effects 0.000 description 1
Landscapes
- Near-Field Transmission Systems (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は、回転体と固定体間にお
いて非接触にて高周波信号を伝送するための非接触型高
周波信号伝送装置に関するものである。
【０００２】
【従来の技術】図3は、従来例に係る非接触型高周波信
号伝送装置の全体構成図である。誘電体基板１の一方の
面（基板表面）に円形の金属箔２を形成し、給電点３に
より、他方の面（基板裏面）にある同軸ケーブル４の芯
線５に接続している。また、給電点３は、基板裏面にお
いて、インピーダンスの整合を行うためのインピーダン
ス素子としてのスタブ７を介して、同軸ケーブル４の外
被導体６に接続して接地されている。
【０００３】図３（Ａ），（Ｂ）に示すような基板を２
つ、図３（Ｃ）に示すように、僅かな隙間をあけて上下
に重ね合わせ、一方の基板を固定し、他方の基板を回転
自在にして構成し、カップリングさせて回転側と固定側
との間で高周波信号を伝送させるようにしたものが非接
触型高周波信号伝送装置である。
【０００４】図４は、非接触型高周波信号伝送装置の基
本原理を示す模式図である。一般に、図４（Ｂ），
（Ｃ）に示す等価回路のように、低周波領域では誘導成
分に、高周波領域では容量成分として作用するように、
スタブ７の幅と長さを調整することにより、その伝送特
性は、図４（Ｄ）に示すように、バンドパスフィルター
のような必要な周波数帯域だけ伝送することが可能とな
る。
【０００５】ここで、衛星放送ＩＦ帯の伝送に用いる場
合には、図４（Ａ）に示す構成において、２つの円形の
金属箔２間の容量成分によってカップリングしている。
【０００６】
【発明が解決しようとする課題】ところが、上述のよう
な構成の非接触型高周波信号伝送装置においては、構造
的に、回転中心に物を通したい場合（例えば、モーター
軸やケーブル等）、回転中心に金属箔２があるため、物
を通すことができなかった。
【０００７】図５は、非接触型高周波信号伝送装置の回
転中心に物を通した場合を示す模式図である。金属箔２
の中心部分には、物を通すための穴８が設けられるた
め、金属箔２は、図５（Ｂ）に示すように、リング状に
なり、給電点３は、金属箔２の中心からずれることにな
り、一方の基板が回転することにより、互いに対向して
配置された基板の給電点３の位置関係が同一方向になっ
たり、反対方向になったりする。このため、互いに対向
して配置された基板の給電点３の位置関係によって、伝
送状態が大きく異なってくるという問題があった。
【０００８】例えば、図５（Ｃ）に示すように、互いに
対向して配置された基板の給電点３の位置が反対方向に
あれば、リング状の金属箔２は、ほぼ均等にカップリン
グするが、図５（Ｄ）に示すように、互いに対向して配
置された基板の給電点３の位置が同一方向にあれば、リ
ング状の金属箔２の給電点３の付近だけが強くカップリ
ングするので、伝送特性が異なってくるのである。図５
（Ｅ）は、互いに対向して配置された基板の給電点３の
位置が反対方向（実線）にある状態から同一方向（破
線）になったとき、伝送特性がどのように変化するかを
示している。
【０００９】このように、従来例においては、伝送コイ
ルの回転中心に物を通し、かつ、安定した伝送特性を得
ることは困難であった。
【００１０】本発明は、上記の点に鑑みて成されたもの
であり、その目的とするところは、給電点の位置関係に
関わらず、ほぼ一定した伝送特性を得ることのできる非
接触型高周波信号伝送装置を提供することにある。
【００１１】
【課題を解決するための手段】請求項１記載の発明は、
一方の面にリング状の導体を形成し、他方の面に、該リ
ング状の導体に高周波電流を供給する給電点を設け、該
給電点に同軸ケーブルにより高周波電流を供給し、前記
給電点が設けられた面に、インピーダンス素子を設け、
該インピーダンス素子を介して、前記給電点と前記同軸
ケーブルの外被導体とを接続して接地するような基板を
形成し、該基板を２つ用いて、一方の基板を固定し、他
方の基板を回転自在にし、かつ、前記リング状の導体が
非接触にて互いに対向するように配置した非接触型高周
波信号伝送装置において、前記リング状の導体の外周部
分で、かつ、前記給電点の近傍の位置に、導体から成る
突起部を設けたことを特徴とするものである。
【００１２】
【作用】請求項１記載の発明は、一方の面にリング状の
導体を形成し、他方の面に、該リング状の導体に高周波
電流を供給する給電点を設け、該給電点に同軸ケーブル
により高周波電流を供給し、前記給電点が設けられた面
に、インピーダンス素子を設け、該インピーダンス素子
を介して、前記給電点と前記同軸ケーブルの外被導体と
を接続して接地するような基板を形成し、該基板を２つ
用いて、一方の基板を固定し、他方の基板を回転自在に
し、かつ、前記リング状の導体が非接触にて互いに対向
するように配置した非接触型高周波信号伝送装置におい
て、前記リング状の導体の外周部分で、かつ、前記給電
点の近傍の位置に、導体から成る突起部を設けており、
基板の中央部分に物を通すための穴を開けても、ほぼ一
定した伝送特性を得ることができる。
【００１３】
【実施例】以下、本発明の一実施例について図面に基づ
き説明する。図１は、本発明の一実施例に係る非接触型
高周波信号伝送装置を示す模式図である。なお、本実施
例に係る非接触型高周波信号伝送装置の基本的構成は、
従来例として図５（Ａ）に示した構成と同じであるの
で、ここでは説明を省略する。本実施例においては、誘
電体基板１の一方の面に形成する金属箔２の中央部分に
穴８が形成され、金属箔２の外周部分で、かつ、給電点
３の近傍の位置に、図１（Ａ）に示すように、導体から
成る末広状の突起部９を設けたり、図１（Ｂ）に示すよ
うに、放物線状の突起部９を設けたり、図１（Ｃ）に示
すように、複数の突起部９を設けた構成である。このよ
うに、突起部９の形状や個数は、限定される必要はな
い。
【００１４】本実施例では、互いに対向して配置された
基板の給電点３の位置が反対方向にあるとき、図１
（Ｄ）に示すように、突起部９はカップリングにほとん
ど寄与せず、互いに対向して配置された基板の給電点３
の位置が同一方向にあるときには、図１（Ｅ）に示すよ
うに、突起部９により、金属箔２の中心に対する給電点
３の外側方向に向かってカップリング面積が確保されて
いるので、突起部９がカップリングに寄与し、互いに対
向して配置された基板の給電点３の位置関係に関わら
ず、伝送特性をほぼ一定とすることができる。つまり、
対向して配置された基板の内の一方が回転しても、ほぼ
一定の伝送特性を得ることができる。
【００１５】図２は、図４（Ａ）に示す突起部９の形状
を用いた非接触型高周波信号伝送装置の衛星放送ＩＦ帯
の伝送に適応した場合の伝送特性図である。なお、衛星
放送ＩＦ帯は、１〜１．３ＧＨｚである。ここで、図中
の実線は、互いに対向して配置された基板の給電点３の
位置が反対方向にある場合の伝送特性を表し、破線は、
互いに対向して配置された基板の給電点３の位置が同一
方向にある場合の伝送特性を表している。実線と破線と
の伝送ロスの差は、最大約１．５ｄＢ程度であり、全周
波数帯域での伝送ロスも３〜５ｄＢ程度であり、実用上
問題ないレベルであった。
【００１６】従って、本実施例においては、金属箔２の
外周部分の給電点３の近傍に突起部９を形成することに
より、給電点の位置に関係なく、一定した伝送特性を得
ることができた。
【００１７】なお、互いに対向して配置されたそれぞれ
の基板の突起部９の形状は、同一である必要はなく、例
えば、図１（Ａ）〜（Ｃ）に示す突起部９の形状を組み
合わせて用いても良く、その場合には、スタブ７の幅と
長さを調整することにより、一定した伝送特性を得るこ
とができる。
【００１８】
【発明の効果】請求項１記載の発明は、一方の面にリン
グ状の導体を形成し、他方の面に、リング状の導体に高
周波電流を供給する給電点を設け、給電点に同軸ケーブ
ルにより高周波電流を供給し、給電点が設けられた面
に、インピーダンス素子を設け、インピーダンス素子を
介して、給電点と同軸ケーブルの外被導体とを接続して
接地するような基板を形成し、基板を２つ用いて、一方
の基板を固定し、他方の基板を回転自在にし、かつ、リ
ング状の導体が非接触にて互いに対向するように配置し
た非接触型高周波信号伝送装置において、リング状の導
体の外周部分で、かつ、給電点の近傍の位置に、導体か
ら成る突起部を設けているので、基板の中央部分に物を
通すための穴を開けても、ほぼ一定した伝送特性を得る
ことができ、給電点の位置関係に関わらず、ほぼ一定し
た伝送特性を得ることのできる非接触型高周波信号伝送
装置を提供することができた。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-contact type high-frequency signal transmission apparatus for transmitting a high-frequency signal between a rotating body and a fixed body in a non-contact manner. . 2. Description of the Related Art FIG. 3 is an overall configuration diagram of a conventional non-contact type high-frequency signal transmission device. A circular metal foil 2 is formed on one surface (substrate surface) of a dielectric substrate 1, and is connected to a core wire 5 of a coaxial cable 4 on the other surface (substrate back surface) by a feeding point 3. The feed point 3 is connected to the outer conductor 6 of the coaxial cable 4 and grounded via a stub 7 as an impedance element for impedance matching on the back surface of the substrate. [0003] A substrate as shown in FIGS.
First, as shown in FIG. 3 (C), one substrate is fixed and the other substrate is rotatable, with a slight gap therebetween, and the other substrate is rotatable. A non-contact type high-frequency signal transmission device is configured to transmit a high-frequency signal between the non-contact type high-frequency signal transmission device. FIG. 4 is a schematic diagram showing a basic principle of a non-contact type high-frequency signal transmission device. Generally, FIG.
As shown in the equivalent circuit shown in (C), the inductive component acts in the low-frequency region and the capacitive component acts in the high-frequency region.
By adjusting the width and length of the stub 7, the transmission characteristics can be transmitted only in a necessary frequency band such as a band-pass filter as shown in FIG. [0005] Here, when used for transmission in the satellite broadcast IF band, in the configuration shown in FIG. 4A, coupling is performed by a capacitance component between two circular metal foils 2. However, in the non-contact type high-frequency signal transmission device having the above-described configuration, it is structurally necessary to pass an object through the center of rotation (for example, a motor shaft, a cable, or the like). ), The object could not be passed because the metal foil 2 was at the center of rotation. FIG. 5 is a schematic diagram showing a case where an object passes through the center of rotation of the non-contact type high-frequency signal transmission device. Metal foil 2
5 is provided with a hole 8 for passing an object in the center portion of the metal foil 2, the metal foil 2 has a ring shape as shown in FIG. 5B, and the feeding point 3 is shifted from the center of the metal foil 2. That is, as one of the substrates rotates, the positional relationship between the power supply points 3 of the substrates arranged opposite to each other may be the same direction or the opposite direction. For this reason, there has been a problem that the transmission state greatly differs depending on the positional relationship between the feeding points 3 of the substrates arranged opposite to each other. For example, as shown in FIG. 5 (C), if the positions of the power supply points 3 of the substrates arranged opposite to each other are in opposite directions, the ring-shaped metal foils 2 are almost uniformly coupled. However, as shown in FIG. 5 (D), if the positions of the power supply points 3 on the substrates arranged opposite to each other are in the same direction, only the vicinity of the power supply point 3 of the ring-shaped metal foil 2 is strongly coupled. Therefore, the transmission characteristics differ. FIG.
(E) shows how the transmission characteristic changes when the position of the feeding point 3 of the substrates arranged opposite to each other changes from the state in the opposite direction (solid line) to the same direction (dashed line). ing. As described above, in the conventional example, it is difficult to pass an object through the rotation center of the transmission coil and obtain stable transmission characteristics. The present invention has been made in view of the above points, and an object of the present invention is to provide a non-contact high-frequency device capable of obtaining substantially constant transmission characteristics irrespective of the positional relationship between feeding points. A signal transmission device is provided. [0011] The invention as set forth in claim 1 is as follows.
A ring-shaped conductor is formed on one surface, and a feeding point for supplying a high-frequency current to the ring-shaped conductor is provided on the other surface, and a high-frequency current is supplied to the feeding point by a coaxial cable. Provide an impedance element on the provided surface,
A substrate is formed such that the power feeding point and the outer conductor of the coaxial cable are connected and grounded through the impedance element, and one of the substrates is fixed using the two substrates, and the other substrate is fixed. In a non-contact type high-frequency signal transmission device in which the ring-shaped conductors are arranged so as to face each other in a non-contact manner, at an outer peripheral portion of the ring-shaped conductor, and near the feeding point. Is provided with a projection made of a conductor at the position (1). According to the first aspect of the present invention, a ring-shaped conductor is formed on one surface, and a feeding point for supplying a high-frequency current to the ring-shaped conductor is provided on the other surface. A high-frequency current is supplied by a coaxial cable, and an impedance element is provided on the surface provided with the feed point, and the feed point and the jacket conductor of the coaxial cable are connected to ground via the impedance element. Such a substrate is formed, two substrates are used, one substrate is fixed, the other substrate is rotatable, and the ring-shaped conductors are arranged so as to face each other in a non-contact manner. In the contact-type high-frequency signal transmission device, at the outer peripheral portion of the ring-shaped conductor, and at a position near the feeding point, provided with a protrusion made of a conductor,
Almost constant transmission characteristics can be obtained even if a hole for passing an object is made in the center of the substrate. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic diagram showing a non-contact high-frequency signal transmission device according to one embodiment of the present invention. The basic configuration of the non-contact type high-frequency signal transmission device according to the present embodiment is as follows.
Since the configuration is the same as that shown in FIG. 5A as a conventional example, the description is omitted here. In the present embodiment, a hole 8 is formed in the central portion of the metal foil 2 formed on one surface of the dielectric substrate 1, and the hole 8 is formed in the outer peripheral portion of the metal foil 2 and at a position near the feeding point 3. As shown in FIG. 1A, a divergent projection 9 made of a conductor is provided, as shown in FIG. 1B, a parabolic projection 9 is provided, or as shown in FIG. In this configuration, a plurality of protrusions 9 are provided. Thus, the shape and the number of the protrusions 9 need not be limited. In the present embodiment, when the position of the feeding point 3 of the substrates arranged opposite to each other is in the opposite direction, FIG.
As shown in (D), the projection 9 hardly contributes to the coupling, and the feeding point 3 of the substrate arranged opposite to each other.
When the positions are in the same direction, as shown in FIG. 1 (E), the projection 9 secures a coupling area toward the outside of the feeding point 3 with respect to the center of the metal foil 2, so that the projection is formed. The portion 9 contributes to the coupling, and the transmission characteristics can be made substantially constant irrespective of the positional relationship between the feeding points 3 of the substrates arranged opposite to each other. That is,
Even if one of the substrates arranged oppositely rotates, substantially constant transmission characteristics can be obtained. FIG. 2 is a transmission characteristic diagram of a non-contact type high-frequency signal transmission device using the shape of the protrusion 9 shown in FIG. The satellite broadcast IF band is 1 to 1.3 GHz. Here, the solid line in the figure represents the transmission characteristics when the position of the feeding point 3 of the substrates arranged opposite to each other is in the opposite direction, and the broken line is
It shows the transmission characteristics in the case where the positions of the feeding points 3 of the substrates arranged opposite to each other are in the same direction. The difference in transmission loss between the solid line and the dashed line was about 1.5 dB at the maximum, and the transmission loss in the entire frequency band was about 3 to 5 dB, which was a practically acceptable level. Therefore, in the present embodiment, by forming the projection 9 near the feeding point 3 on the outer peripheral portion of the metal foil 2, constant transmission characteristics can be obtained regardless of the position of the feeding point. Was. The shapes of the protrusions 9 of the respective substrates arranged opposite to each other need not be the same, and for example, the shapes of the protrusions 9 shown in FIGS. In this case, a constant transmission characteristic can be obtained by adjusting the width and length of the stub 7. According to the first aspect of the present invention, a ring-shaped conductor is formed on one surface, and a feeding point for supplying a high-frequency current to the ring-shaped conductor is provided on the other surface. A high-frequency current is supplied by a coaxial cable to the substrate on which the feed point is provided, and an impedance element is provided on the surface where the feed point is connected to the jacket conductor of the coaxial cable via the impedance element. A non-contact type high-frequency signal transmission device in which two substrates are formed, one of the substrates is fixed, the other substrate is rotatable, and the ring-shaped conductors are arranged so as to face each other in a non-contact manner. In the above, since the protrusion made of the conductor is provided at the outer peripheral portion of the ring-shaped conductor and at a position near the feeding point, even if a hole for passing an object through the center portion of the substrate is made, it is almost constant. Transmission characteristics Thus, a non-contact type high-frequency signal transmission device capable of obtaining substantially constant transmission characteristics irrespective of the positional relationship of the feeding points can be provided.
【図面の簡単な説明】
【図１】本発明の一実施例に係る非接触型高周波信号伝
送装置を示す模式図である。
【図２】上図の（Ａ）に示す突起部の形状を用いた非接
触型高周波信号伝送装置の衛星放送ＩＦ帯の伝送に適応
した場合の伝送特性図である。
【図３】従来例に係る非接触型高周波信号伝送装置の全
体構成図である。
【図４】非接触型高周波信号伝送装置の基本原理を示す
模式図である。
【図５】従来例に係る非接触型高周波信号伝送装置の回
転中心に物を通した場合を示す模式図である。
【符号の説明】
１ 誘電体基板
２ 金属箔
３ 給電点
４ 同軸ケーブル
５ 芯線
６ 外被導体
７ スタブ
８ 穴
９ 突起部BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic diagram showing a non-contact high-frequency signal transmission device according to one embodiment of the present invention. FIG. 2 is a transmission characteristic diagram of a non-contact type high-frequency signal transmission device using the shape of the protrusion shown in FIG. FIG. 3 is an overall configuration diagram of a non-contact type high-frequency signal transmission device according to a conventional example. FIG. 4 is a schematic diagram illustrating a basic principle of a non-contact type high-frequency signal transmission device. FIG. 5 is a schematic diagram showing a case where an object passes through the center of rotation of a non-contact type high-frequency signal transmission device according to a conventional example. [Description of Signs] 1 Dielectric substrate 2 Metal foil 3 Feeding point 4 Coaxial cable 5 Core wire 6 Outer conductor 7 Stub 8 Hole 9 Projection
───────────────────────────────────────────────────── フロントページの続き (58)調査した分野(Int.Cl.7，ＤＢ名) H04B 5/00 - 5/02 ＪＩＣＳＴファイル（ＪＯＩＳ)──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int. Cl. 7 , DB name) H04B 5/00-5/02 JICST file (JOIS)
Claims (1)
方の面に、該リング状の導体に高周波電流を供給する給
電点を設け、該給電点に同軸ケーブルにより高周波電流
を供給し、前記給電点が設けられた面に、インピーダン
ス素子を設け、該インピーダンス素子を介して、前記給
電点と前記同軸ケーブルの外被導体とを接続して接地す
るような基板を形成し、該基板を２つ用いて、一方の基
板を固定し、他方の基板を回転自在にし、かつ、前記リ
ング状の導体が非接触にて互いに対向するように配置し
た非接触型高周波信号伝送装置において、前記リング状
の導体の外周部分で、かつ、前記給電点の近傍の位置
に、導体から成る突起部を設けたことを特徴とする非接
触型高周波信号伝送装置。(57) [Claim 1] A ring-shaped conductor is formed on one surface, and a feeding point for supplying a high-frequency current to the ring-shaped conductor is provided on the other surface. A high-frequency current is supplied by a coaxial cable, and an impedance element is provided on the surface provided with the feed point, and the feed point and the jacket conductor of the coaxial cable are connected to ground via the impedance element. Such a substrate is formed, two substrates are used, one substrate is fixed, the other substrate is rotatable, and the ring-shaped conductors are arranged so as to face each other in a non-contact manner. A contact-type high-frequency signal transmission device, wherein a protrusion made of a conductor is provided at an outer peripheral portion of the ring-shaped conductor and at a position near the power supply point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16338695A JP3475582B2 (en) | 1995-06-29 | 1995-06-29 | Non-contact high-frequency signal transmission device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16338695A JP3475582B2 (en) | 1995-06-29 | 1995-06-29 | Non-contact high-frequency signal transmission device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0918393A JPH0918393A (en) | 1997-01-17 |
| JP3475582B2 true JP3475582B2 (en) | 2003-12-08 |
Family
ID=15772909
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16338695A Expired - Lifetime JP3475582B2 (en) | 1995-06-29 | 1995-06-29 | Non-contact high-frequency signal transmission device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3475582B2 (en) |
Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4345850B2 (en) | 2006-09-11 | 2009-10-14 | ソニー株式会社 | Communication system and communication apparatus |
| JP4345851B2 (en) | 2006-09-11 | 2009-10-14 | ソニー株式会社 | Communication system and communication apparatus |
| JP4893483B2 (en) | 2006-09-11 | 2012-03-07 | ソニー株式会社 | Communications system |
| EP1926223B1 (en) | 2006-11-21 | 2018-02-28 | Sony Corporation | Communication system and communication apparatus |
| JP4923975B2 (en) | 2006-11-21 | 2012-04-25 | ソニー株式会社 | Communication system and communication apparatus |
| JP4983418B2 (en) * | 2007-06-13 | 2012-07-25 | ソニー株式会社 | Communication device |
| JP4403431B2 (en) | 2007-06-14 | 2010-01-27 | ソニー株式会社 | Communication system and communication apparatus |
| JP4983425B2 (en) * | 2007-06-18 | 2012-07-25 | ソニー株式会社 | Communication device |
| JP5083122B2 (en) * | 2008-08-26 | 2012-11-28 | ソニー株式会社 | High frequency coupler and electric field signal radiating element |
| JP5981202B2 (en) * | 2012-04-13 | 2016-08-31 | 古河電気工業株式会社 | Power transmission system |
| JP5981203B2 (en) * | 2012-04-16 | 2016-08-31 | 古河電気工業株式会社 | Power transmission system |
-
1995
- 1995-06-29 JP JP16338695A patent/JP3475582B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0918393A (en) | 1997-01-17 |
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