JPH088687A - Surface acoustic wave converter - Google Patents
Surface acoustic wave converterInfo
- Publication number
- JPH088687A JPH088687A JP13756494A JP13756494A JPH088687A JP H088687 A JPH088687 A JP H088687A JP 13756494 A JP13756494 A JP 13756494A JP 13756494 A JP13756494 A JP 13756494A JP H088687 A JPH088687 A JP H088687A
- Authority
- JP
- Japan
- Prior art keywords
- sound absorbing
- surface acoustic
- sound absorption
- acoustic wave
- piezoelectric substrate
- 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.)
- Granted
Links
- 238000010897 surface acoustic wave method Methods 0.000 title claims abstract description 50
- 239000000758 substrate Substances 0.000 claims abstract description 25
- 239000011358 absorbing material Substances 0.000 claims description 20
- 244000126211 Hericium coralloides Species 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気信号を一旦弾性表
面波に変換するとともに同弾性表面波を再度電気信号に
変換して出力することにより、入力した電気信号の特性
を変更して出力する弾性表面波変換器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention changes the characteristics of an input electric signal and outputs it by once converting the electric signal into a surface acoustic wave and again converting the surface acoustic wave into an electric signal and outputting the electric signal. The present invention relates to a surface acoustic wave converter.
【０００２】[0002]
【従来の技術】従来、この種の弾性表面波変換器は、例
えば特開平６−２９７７１号公報に示されているよう
に、櫛歯状にそれぞれ形成した入力電極及び出力電極を
相対向させてなる圧電基板上に、入力電極及び出力電極
の各外側にて吸音材をそれぞれ塗布してなる第１及び第
２吸音部と、入力電極の外側の角部にて複数の帯状の吸
音材を同入力電極の各櫛歯部に対して斜めに交差させて
塗布してなる第３吸音部とを備え、多重反射や回折現象
による不要弾性表面波が発生しないようにして周波数に
対する群遅延特性及び振幅特性が良好になるようにして
いる。2. Description of the Related Art Conventionally, in this type of surface acoustic wave converter, as shown in, for example, Japanese Unexamined Patent Publication No. 6-29771, an input electrode and an output electrode formed in a comb shape are made to face each other. On the piezoelectric substrate, the first and second sound absorbing parts are formed by applying the sound absorbing material on the outer sides of the input electrode and the output electrode respectively, and the plurality of strip-shaped sound absorbing materials are formed on the outer corners of the input electrode. A third sound absorbing portion that is applied by obliquely intersecting each comb-tooth portion of the input electrode to prevent unnecessary surface acoustic waves due to multiple reflection and diffraction phenomena, and group delay characteristics and amplitude with respect to frequency. I try to improve the characteristics.
【０００３】[0003]
【発明が解決しようとする課題】しかし、上記従来の装
置にあっても、第１及び第２吸音部の各内側境界、圧電
基板の端部及び第３吸音部の境界での反射による不要弾
性表面波が発生して、周波数に対する群遅延特性及び振
幅特性が充分に良好にならない。本発明は上記問題に対
処するためになされたもので、前記反射による不要弾性
表面波を抑制して、周波数に対する群遅延特性および振
幅特性がより良好となる弾性表面波変換器を提供するこ
とにある。However, even in the above-mentioned conventional device, unnecessary elasticity due to reflection at the inner boundaries of the first and second sound absorbing parts, the end of the piezoelectric substrate and the boundary of the third sound absorbing part. Surface waves are generated, and the group delay characteristic and amplitude characteristic with respect to frequency are not sufficiently improved. The present invention has been made to solve the above problem, and provides a surface acoustic wave converter that suppresses unnecessary surface acoustic waves due to the reflection and has better group delay characteristics and amplitude characteristics with respect to frequency. is there.
【０００４】[0004]
【課題を解決するための手段】上記目的を達成するため
に、本発明の構成上の特徴は、櫛歯状にそれぞれ形成し
た入力電極及び出力電極を相対向させてなる圧電基板上
に、入力電極及び出力電極の各外側にて吸音材をそれぞ
れ塗布してなる第１及び第２吸音部と、入力電極の外側
の角部にて複数の帯状の吸音材を同入力電極の各櫛歯部
に対して斜めに交差させて塗布してなる第３吸音部とを
有する弾性表面波変換器において、圧電基板上の入力電
極と第１吸音部の間及び第３吸音部上にて同第１及び第
３吸音部を構成する吸音材よりも軟質の吸音材を塗布し
てなる第４吸音部と、圧電基板上の出力電極と第２吸音
部の間にて同第２吸音部を構成する吸音材よりも軟質の
吸音材を塗布してなる第５吸音部とを設けたことにあ
る。In order to achieve the above object, the structural feature of the present invention is that the input electrode and the output electrode, which are respectively formed in a comb-like shape, are provided on a piezoelectric substrate facing each other. First and second sound absorbing parts formed by applying a sound absorbing material on the outside of each of the electrodes and the output electrode, and a plurality of strip-shaped sound absorbing materials at the corners on the outside of the input electrode. In a surface acoustic wave converter having a third sound absorbing portion which is obliquely intersected with and applied to the first sound absorbing portion and between the input electrode on the piezoelectric substrate and the first sound absorbing portion. And a fourth sound absorbing part formed by applying a sound absorbing material softer than the sound absorbing material forming the third sound absorbing part, and the second sound absorbing part between the output electrode and the second sound absorbing part on the piezoelectric substrate. The fifth sound absorbing section is formed by applying a sound absorbing material that is softer than the sound absorbing material.
【０００５】[0005]
【発明の作用・効果】上記のように構成した本発明にお
いては、入力電極と第１吸音部の間に位置する第４吸音
部も、出力電極と第２吸音部の間に位置する第５吸音部
も軟質に構成されているので、同第４及び第５吸音部の
各電極側の境界での反射による不要弾性表面波が減少す
る。また、軟質の第４吸音部は第３吸音部を覆っている
ので、第３吸音部の境界での反射による不要弾性表面波
も減少する。さらに、圧電基板の端部側に位置する第１
及び第２吸音部は硬質に構成されるので、圧電基板の端
部に届く弾性表面が減少して、同端部での反射による不
要弾性表面波が減少する。このようにして不要弾性表面
波の発生が抑制される結果、本発明の弾性表面波変換器
によれば、周波数に対する群遅延特性および振幅特性が
より良好となる。In the present invention configured as described above, the fourth sound absorbing section located between the input electrode and the first sound absorbing section also has the fifth sound absorbing section located between the output electrode and the second sound absorbing section. Since the sound absorbing section is also configured to be soft, unnecessary surface acoustic waves due to reflection at the boundaries of the fourth and fifth sound absorbing sections on the respective electrode sides are reduced. Further, since the soft fourth sound absorbing portion covers the third sound absorbing portion, unnecessary surface acoustic waves due to reflection at the boundary of the third sound absorbing portion are also reduced. Further, the first portion located on the end side of the piezoelectric substrate
Also, since the second sound absorbing portion is configured to be hard, the elastic surface reaching the end portion of the piezoelectric substrate is reduced, and unnecessary surface acoustic waves due to reflection at the end portion are reduced. As a result of suppressing the generation of unnecessary surface acoustic waves in this manner, the surface acoustic wave converter of the present invention has better group delay characteristics and amplitude characteristics with respect to frequency.
【０００６】[0006]
【実施例】以下、本発明の一実施例を図面を用いて説明
すると、図１は同実施例に係る弾性表面波変換器を概略
的に示した平面図である。この弾性表面波変換器は、Li
NbO3,LiTaO3,水晶などの圧電材料を直方体状に形成した
圧電基板１０を備えている。圧電基板１０上には、櫛歯
状にそれぞれ形成した入力電極１１及び出力電極１２が
相対向して設けられていて、弾性表面波が入力電極１１
から出力電極１２に伝搬されるようになっている。入力
電極１１は平行に延設された一対の基部１１ａ，１１ｂ
と各基部１１ａ，１１ｂからそれぞれ垂直に延設された
多数の櫛歯部１１ｃ，１１ｄとからなり、各櫛歯部１１
ｃ，１１ｄ間の交差長を異ならせて重み付け弾性表面波
変換器を構成している。出力電極１２は平行に延設され
た一対の基部１２ａ，１２ｂと各基部１２ａ，１２ｂか
らそれぞれ垂直に延設された少数の櫛歯部１２ｃ，１２
ｄとからなり、各櫛歯部１２ｃ，１２ｄ間の交差長を一
定にして正規型弾性表面波変換器を構成している。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view schematically showing a surface acoustic wave converter according to the embodiment. This surface acoustic wave converter is
The piezoelectric substrate 10 has a rectangular parallelepiped shape made of a piezoelectric material such as NbO 3 , LiTaO 3 , and quartz. On the piezoelectric substrate 10, an input electrode 11 and an output electrode 12 each formed in a comb shape are provided so as to face each other, and a surface acoustic wave receives the input electrode 11.
Is transmitted to the output electrode 12. The input electrode 11 includes a pair of base portions 11a and 11b extending in parallel.
And a large number of comb tooth portions 11c and 11d vertically extending from the respective base portions 11a and 11b.
The weighted surface acoustic wave converter is configured by changing the intersection length between c and 11d. The output electrode 12 includes a pair of bases 12a and 12b extending in parallel and a small number of comb teeth 12c and 12 extending vertically from the bases 12a and 12b, respectively.
and a regular surface acoustic wave converter with a constant cross length between the comb teeth 12c and 12d.
【０００７】入力電極１１及び出力電極１２の各外側に
は硬質の吸音材（例えばＪＩＳ−Ａの６０）を塗布した
吸音部１３，１４がそれぞれ設けられている。入力電極
１１の外側の角部であって櫛歯部１１ｃ，１１ｄが交差
していない部分には、複数の帯状に形成した硬質の吸音
材（例えばＪＩＳ−Ａの６０）を各櫛歯部１１ｃ，１１
ｄに斜めに交差するように塗布した吸音部１５が設けら
れている。この吸音部１５の各帯の一端はまとめて吸音
部１３に接続され、各他端は入力電極１１の基部１１
ａ，１１ｂに分離して接続されている。また、入力電極
１１と出力電極１２との間の弾性表面波の伝搬路上であ
ってその縁部には硬質の吸音材（例えばＪＩＳ−Ａの６
０）を塗布した一対の吸音部１６，１６が設けられてい
る。Sound absorbing portions 13 and 14 coated with a hard sound absorbing material (for example, JIS-A 60) are provided on the outer sides of the input electrode 11 and the output electrode 12, respectively. At the outer corners of the input electrode 11 where the comb teeth 11c and 11d do not intersect, a plurality of band-shaped hard sound absorbing materials (for example, JIS-A 60) are provided in the comb teeth 11c. , 11
The sound absorbing portion 15 is provided so as to intersect with d obliquely. One end of each band of the sound absorbing portion 15 is collectively connected to the sound absorbing portion 13, and each other end is connected to the base portion 11 of the input electrode 11.
a and 11b are separately connected. In addition, on the propagation path of the surface acoustic wave between the input electrode 11 and the output electrode 12, a hard sound absorbing material (for example, JIS-A 6
0) is applied to the pair of sound absorbing parts 16, 16.
【０００８】さらに、入力電極１１と吸音部１３の間に
位置する圧電基板１０の上、入力電極１１の外側の角部
であって櫛歯部１１ｃ，１１ｄの一部を含む吸音部１５
の上、基部１１ａ，１１ｂの一部であって吸音部１５が
接続されている部分の上、及び同部分の側方に位置する
圧電基板１０の上には、前記吸音部１３〜１６を構成す
る吸音材よりも軟質の吸音材（例えば、ＪＩＳ−Ａの２
４）を塗布した吸音部１７が設けられている。この吸音
部１７の形成にあたっては、図２に示すように吸音部１
３，１５を形成した後に、軟質の吸音材を圧電基板１０
上に塗布することによって吸音部１７を形成する。ま
た、出力電極１２と吸音部１４の間に位置する圧電基板
１０の上には、前記吸音部１７と同等な軟質の吸音材
（例えば、ＪＩＳ−Ａの２４）を塗布した吸音部１８が
設けられている。Further, on the piezoelectric substrate 10 located between the input electrode 11 and the sound absorbing portion 13, the sound absorbing portion 15 which is a corner portion outside the input electrode 11 and includes a part of the comb tooth portions 11c and 11d.
The sound absorbing parts 13 to 16 are formed on the upper part of the base parts 11a and 11b to which the sound absorbing part 15 is connected, and on the piezoelectric substrate 10 located on the side of the part. Sound absorbing material softer than the sound absorbing material (for example, JIS-A 2
The sound absorbing part 17 coated with 4) is provided. When forming the sound absorbing portion 17, as shown in FIG.
After forming 3, 15, the soft sound absorbing material is applied to the piezoelectric substrate 10.
The sound absorbing portion 17 is formed by applying it on the top. Further, on the piezoelectric substrate 10 located between the output electrode 12 and the sound absorbing portion 14, a sound absorbing portion 18 coated with a soft sound absorbing material (for example, JIS-A 24) equivalent to the sound absorbing portion 17 is provided. Has been.
【０００９】このように構成した弾性表面波変換器の使
用状態においては、入力電極１１の基部１１ａ，１１ｂ
に高周波発振器２１が接続されるとともに出力電極１２
の基部１２ａ，１２ｂ間には抵抗２２が接続されて、抵
抗２２の両端から出力信号を得るようにする。これによ
り、高周波発振器２１からの高周波電気信号は入力電極
１１にて弾性表面波に変換され、同弾性表面波が出力電
極１２に伝搬されて同電極１２にてふたたび電気信号に
変換されて出力される。この場合、入力された高周波信
号は、入力電極１１、出力電極１２などにより、帯域制
限されかつ所定の周波数特性をもつ信号に変換されて出
力されることになる。In use of the surface acoustic wave converter thus constructed, the base portions 11a and 11b of the input electrode 11 are in use.
The high frequency oscillator 21 is connected to the output electrode 12
A resistor 22 is connected between the bases 12a and 12b of the so as to obtain an output signal from both ends of the resistor 22. As a result, the high frequency electric signal from the high frequency oscillator 21 is converted into a surface acoustic wave at the input electrode 11, the surface acoustic wave is propagated to the output electrode 12, is converted again into an electric signal at the same electrode 12, and is output. It In this case, the input high frequency signal is converted into a signal having a band-limited and predetermined frequency characteristic by the input electrode 11, the output electrode 12, etc., and then output.
【００１０】このような弾性表面波変換器の作動状態に
おいては、吸音部１３〜１８は圧電基板１０上を伝搬す
る不要弾性表面波を吸収する。具体的には、吸音部１
３，１４は硬質に構成されていて、圧電基板１０上を同
基板１０の端部に向かって伝搬する弾性表面波を多量に
吸収して同端部に到達する弾性表面波を減少させるの
で、同端部での反射による不要弾性表面波を減少させ
る。吸音部１５は入力電極１１の櫛歯部１１ｃ，１１ｄ
での多重反射による不要弾性表面波を吸収する。吸音部
１６は回折現象による圧電基板１０上の不要弾性表面波
を吸収する。吸音部１７，１８は軟質に構成されている
ので、吸音部１７の一部であって入力電極１１と吸音部
１３との間に位置する部分及び吸音部１８は吸音部１
７，１８に入射する際の同吸音部１７，１８の境界での
反射による不要弾性表面波の発生を抑制するとともに、
同吸音部１７，１８から吸音部１３，１４に入射する際
の同吸音部１３，１４の境界での反射による不要弾性表
面波の発生を抑制する。さらに、吸音部１７の一部であ
って吸音部１５を覆っている部分は、吸音部１５の境界
での反射による不要弾性表面波の発生を抑制する。In such an operating state of the surface acoustic wave converter, the sound absorbing parts 13 to 18 absorb unnecessary surface acoustic waves propagating on the piezoelectric substrate 10. Specifically, the sound absorbing unit 1
3 and 14 are configured to be hard and absorb a large amount of surface acoustic waves propagating on the piezoelectric substrate 10 toward the end portion of the substrate 10 to reduce the surface acoustic wave reaching the end portion. Unnecessary surface acoustic waves due to reflection at the same end are reduced. The sound absorbing portion 15 is the comb tooth portions 11c and 11d of the input electrode 11.
Absorbs unnecessary surface acoustic waves due to multiple reflection at. The sound absorbing section 16 absorbs unnecessary surface acoustic waves on the piezoelectric substrate 10 due to the diffraction phenomenon. Since the sound absorbing parts 17 and 18 are configured to be soft, the sound absorbing part 18 is a part of the sound absorbing part 17 and is located between the input electrode 11 and the sound absorbing part 13.
In addition to suppressing the generation of unnecessary surface acoustic waves due to reflection at the boundary between the sound absorbing parts 17 and 18 when entering the 7 and 18,
The generation of unnecessary surface acoustic waves due to reflection at the boundary between the sound absorbing parts 13 and 14 when entering the sound absorbing parts 13 and 14 from the sound absorbing parts 17 and 18 is suppressed. Further, a part of the sound absorbing portion 17 that covers the sound absorbing portion 15 suppresses generation of unnecessary surface acoustic waves due to reflection at the boundary of the sound absorbing portion 15.
【００１１】次に、吸音部１７，１８による不要弾性表
面波の発生の抑制効果を確認するための実験結果につい
て説明する。図３(Ａ)及び図４(Ａ)は吸音部１３〜１６
のみを設けた従来の弾性表面波変換器の周波数に対する
群遅延特性及び振幅特性をそれぞれ表すグラフであり、
図３(Ｂ)及び図４(Ｂ)は前記弾性表面波変換器に吸音部
１７，１８を付加した場合の周波数に対する群遅延特性
及び振幅特性をそれぞれ表すグラフである。図３(Ａ)及
び図３(Ｂ)を比較することにより、吸音部１７，１８を
設けた本実施例によれば、大きな周期をもつリップル、
うねりが小さくなったことが確認される。また、図４
(Ａ)及び図４(Ｂ)を比較することにより、吸音部１７，
１８を設けた本実施例によれば、振幅特性の立ち上がり
及び立ち下がり特性が良好すなわち傾きが若干急峻にな
ったことが確認される。Next, the experimental results for confirming the effect of suppressing the generation of unnecessary surface acoustic waves by the sound absorbing parts 17, 18 will be described. 3 (A) and 4 (A) show the sound absorbing parts 13-16.
Is a graph showing the group delay characteristic and the amplitude characteristic with respect to the frequency of the conventional surface acoustic wave converter provided with, respectively,
FIGS. 3B and 4B are graphs respectively showing the group delay characteristic and the amplitude characteristic with respect to the frequency when the sound absorbing parts 17 and 18 are added to the surface acoustic wave converter. By comparing FIG. 3 (A) and FIG. 3 (B), according to the present embodiment in which the sound absorbing parts 17 and 18 are provided, a ripple having a large period,
It is confirmed that the swell is reduced. Also, FIG.
By comparing (A) and FIG. 4 (B), the sound absorbing part 17,
According to this example in which 18 is provided, it is confirmed that the rising and falling characteristics of the amplitude characteristic are good, that is, the inclination is slightly steep.
【００１２】以上の説明から理解できるとおり、上記実
施例によれば、吸音部１７，１８を設けたことにより、
圧電基板１０上における不要弾性表面波が良好に抑制さ
れて、弾性表面波変換器の周波数に対する群遅延特性及
び振幅特性が改善される。As can be understood from the above description, according to the above embodiment, since the sound absorbing parts 17 and 18 are provided,
Unwanted surface acoustic waves on the piezoelectric substrate 10 are suppressed well, and the group delay characteristic and the amplitude characteristic of the surface acoustic wave converter with respect to the frequency are improved.
【図１】 本発明の一実施例を示す弾性表面波変換器の
平面概略図である。FIG. 1 is a schematic plan view of a surface acoustic wave converter according to an embodiment of the present invention.
【図２】 前記弾性表面波変換器の吸音部１７，１８を
設ける前の状態を示す部分図である。FIG. 2 is a partial view showing a state before the sound absorbing parts 17 and 18 of the surface acoustic wave converter are provided.
【図３】 (Ａ)は従来の弾性表面波変換器の周波数に対
する群遅延特性を示すグラフであり、(Ｂ)は前記実施例
に係る弾性表面波変換器の同群遅延特性を示すグラフで
ある。3A is a graph showing a group delay characteristic with respect to frequency of a conventional surface acoustic wave converter, and FIG. 3B is a graph showing a same group delay characteristic of the surface acoustic wave converter according to the embodiment. is there.
【図４】 (Ａ)は従来の弾性表面波変換器の周波数に対
する振幅特性を示すグラフであり、(Ｂ)は前記実施例に
係る弾性表面波変換器の同振幅特性を示すグラフであ
る。FIG. 4A is a graph showing an amplitude characteristic with respect to frequency of a conventional surface acoustic wave converter, and FIG. 4B is a graph showing the same amplitude characteristic of the surface acoustic wave converter according to the embodiment.
１０…圧電基板、１１…入力電極、１２…出力電極、１
３〜１８…吸音部。10 ... Piezoelectric substrate, 11 ... Input electrode, 12 ... Output electrode, 1
3-18 ... Sound absorption part.
Claims (1)
出力電極を相対向させてなる圧電基板上に、前記入力電
極及び出力電極の各外側にて吸音材をそれぞれ塗布して
なる第１及び第２吸音部と、前記入力電極の外側の角部
にて複数の帯状の吸音材を同入力電極の各櫛歯部に対し
て斜めに交差させて塗布してなる第３吸音部とを有する
弾性表面波変換器において、前記圧電基板上の入力電極
と第１吸音部の間及び前記第３吸音部上にて同第１及び
第３吸音部を構成する吸音材よりも軟質の吸音材を塗布
してなる第４吸音部と、前記圧電基板上の出力電極と第
２吸音部の間にて同第２吸音部を構成する吸音材よりも
軟質の吸音材を塗布してなる第５吸音部とを設けたこと
を特徴とする弾性表面波変換器。1. A sound absorbing material is applied on the outside of each of the input electrode and the output electrode on a piezoelectric substrate in which an input electrode and an output electrode formed in a comb shape are opposed to each other. It has a second sound absorbing portion and a third sound absorbing portion formed by applying a plurality of strip-shaped sound absorbing materials at the outer corners of the input electrode while obliquely intersecting each comb tooth portion of the same input electrode. In the surface acoustic wave converter, a sound absorbing material that is softer than the sound absorbing material forming the first and third sound absorbing portions is provided between the input electrode and the first sound absorbing portion on the piezoelectric substrate and on the third sound absorbing portion. A fourth sound absorbing part that is applied, and a fifth sound absorbing part that is softer than the sound absorbing material that constitutes the second sound absorbing part between the output electrode and the second sound absorbing part on the piezoelectric substrate. And a surface acoustic wave converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13756494A JP3343442B2 (en) | 1994-06-20 | 1994-06-20 | Surface acoustic wave converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13756494A JP3343442B2 (en) | 1994-06-20 | 1994-06-20 | Surface acoustic wave converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH088687A true JPH088687A (en) | 1996-01-12 |
| JP3343442B2 JP3343442B2 (en) | 2002-11-11 |
Family
ID=15201672
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13756494A Expired - Fee Related JP3343442B2 (en) | 1994-06-20 | 1994-06-20 | Surface acoustic wave converter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3343442B2 (en) |
-
1994
- 1994-06-20 JP JP13756494A patent/JP3343442B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JP3343442B2 (en) | 2002-11-11 |
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