JPH0543538Y2 - - Google Patents
Info
- Publication number
- JPH0543538Y2 JPH0543538Y2 JP1984135602U JP13560284U JPH0543538Y2 JP H0543538 Y2 JPH0543538 Y2 JP H0543538Y2 JP 1984135602 U JP1984135602 U JP 1984135602U JP 13560284 U JP13560284 U JP 13560284U JP H0543538 Y2 JPH0543538 Y2 JP H0543538Y2
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- electrode
- extraction
- divided
- filter
- 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
- 238000000605 extraction Methods 0.000 claims description 50
- 239000000758 substrate Substances 0.000 claims description 23
- 239000000919 ceramic Substances 0.000 claims description 21
- 230000000694 effects Effects 0.000 description 8
- 230000005684 electric field Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Landscapes
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Description
【考案の詳細な説明】
＜産業上の利用分野＞
本考案は、厚み振動を利用した複数素子型の圧
電フイルタに関する。圧電フイルタは、メカニカ
ルＱの高いフイルタとして、例えばAMもしくは
FM用フイルタ、テレビ用フイルタ、通信機器フ
イルタ等に広く利用されている。[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a multi-element piezoelectric filter that utilizes thickness vibration. Piezoelectric filters are used as filters with high mechanical Q, such as AM or
Widely used in FM filters, TV filters, communication equipment filters, etc.
＜従来の技術＞
この種の圧電フイルタとしては、２素子型、３
素子型或いは４素子型等のものが知られている。
第３図は３素子型圧電フイルタを示し、１及び２
は入力端子、３及び４は出力端子である。５〜７
はフイルタ素子、９〜１０はコンデンサ素子であ
る。フイルタ素子５〜７の各々は、圧電磁器基板
１２の片面に設けた共通電極５１，６１及び７１
のそれぞれを共通に接続すると共に、反対側の面
に互いに独立して設けた分割電極５２，５３，６
２，６３及び７２，７３とで構成された駆動電極
を有し、入出力端子１−３間で直列に接続するこ
とにより、縦続接続した回路構成となつている。
フイルタ素子の縦続接続数により、２素子型或い
は４素子型の圧電フイルタが得られる。<Prior art> This type of piezoelectric filter includes two-element type and three-element type.
Element type, four element type, etc. are known.
Figure 3 shows a three-element piezoelectric filter, 1 and 2.
is an input terminal, and 3 and 4 are output terminals. 5-7
is a filter element, and 9 to 10 are capacitor elements. Each of the filter elements 5 to 7 has common electrodes 51, 61 and 71 provided on one side of the piezoelectric ceramic substrate 12.
divided electrodes 52, 53, 6 which are connected in common and provided independently from each other on opposite surfaces.
2, 63 and 72, 73, and are connected in series between the input and output terminals 1-3 to form a cascade-connected circuit configuration.
Depending on the number of cascaded filter elements, a two-element or four-element piezoelectric filter can be obtained.
第４図及び第５図は第３図に示した３素子型圧
電フイルタの具体的な構造を示す図で、分極処理
した平板状の圧電磁器基板１２の一面に、共通電
極５１〜７１を形成すると共に、反対側の面上の
前記共通電極５１〜７１の配設位置と対向する位
置に、分割電極５２，５３〜７２，７３を形成し
た構造となつている。共通電極５１〜７１は、こ
れらから延長された引出電極５１１〜７１１を通
して端子電極部２，４に接続されている。また分
割電極５２は引出電極５２１を通して端子電極１
に接続され、分割電極５３，６２は引出電極５３
１，６２１を通して電極９１に接続され、分割電
極６３，７２は引出電極６３１，７２１を通して
電極１０１に接続され、更に分割電極７３は引出
電極７３１を通して端子電極３に接続されてい
る。引出電極５１１〜７３１は圧電磁器基板１２
の幅方向に沿つて互いに平行となるように設けら
れている。 4 and 5 are diagrams showing the specific structure of the three-element piezoelectric filter shown in FIG. 3, in which common electrodes 51 to 71 are formed on one surface of a polarized flat piezoelectric ceramic substrate 12. At the same time, split electrodes 52, 53 to 72, 73 are formed at positions facing the common electrodes 51 to 71 on the opposite surface. The common electrodes 51 to 71 are connected to the terminal electrode parts 2 and 4 through lead electrodes 511 to 711 extended therefrom. Furthermore, the divided electrode 52 passes through the terminal electrode 1 through the extraction electrode 521.
The divided electrodes 53 and 62 are connected to the extraction electrode 53
The split electrodes 63 and 72 are connected to the electrode 101 through the lead electrodes 631 and 721, and the split electrode 73 is connected to the terminal electrode 3 through the lead electrode 731. The extraction electrodes 511 to 731 are the piezoelectric ceramic substrate 12
are provided so as to be parallel to each other along the width direction.
＜考案が解決しようとする課題＞
ところが、従来の厚み振動利用の圧電フイルタ
は、共通電極５１〜７１の引出電極５１１〜７１
１と、分割電極５２，５３〜７２，７３の引出電
極５２１，５３１〜７２１，７３１とが互いに平
行するように形成されているため、圧電磁器基板
１２の厚み方向に対して垂直方向となる電界Ev
が大きくなる。<Problem to be solved by the invention> However, in the conventional piezoelectric filter using thickness vibration, the extraction electrodes 511 to 71 of the common electrodes 51 to 71
1 and the extraction electrodes 521, 531 to 721, 731 of the divided electrodes 52, 53 to 72, 73 are formed so as to be parallel to each other, so that the electric field is perpendicular to the thickness direction of the piezoelectric ceramic substrate 12. Ev
becomes larger.
同一の圧電磁器基板１２上に複数のフイルタ素
子５〜７を有する複数素子型の圧電フイルタにお
いては、フイルタ素子５〜７のうち、互いに隣接
するフイルタ素子５と６，６と７は、例えばフイ
ルタ素子５，６に注目すると、分割電極５３及び
分割電極６２が、各々から導かれた引出電極５３
１，６２１により互いに接続されている。引出電
極５３１，６２１は、小型化の要求等から平面積
の制限された平面内に形成する必要があり、引出
電極５３１と引出電極６２１との相互間の距離、
及び、これらと共通電極５１，６１から導かれた
引出電極５１１，６１１との間の距離が短くなら
ざるを得ず、必然的に圧電磁器基板１２の厚み方
向に対して垂直方向となる電界Evが大きくなる。 In a multi-element piezoelectric filter having a plurality of filter elements 5 to 7 on the same piezoelectric ceramic substrate 12, among the filter elements 5 to 7, the filter elements 5 and 6, 6 and 7 that are adjacent to each other are, for example, filter elements. Paying attention to the elements 5 and 6, the divided electrode 53 and the divided electrode 62 are connected to the extraction electrode 53 led from each.
1,621. The extraction electrodes 531 and 621 must be formed within a plane with a limited planar area due to the demand for miniaturization, etc., and the distance between the extraction electrodes 531 and 621,
Also, the distance between these and the extraction electrodes 511, 611 led from the common electrodes 51, 61 must be shortened, and the electric field Ev necessarily becomes perpendicular to the thickness direction of the piezoelectric ceramic substrate 12. becomes larger.
このため、厚み縦振動における選択中心周波数
の約半分の周波数／２を基本波とする、厚み
すべりモードに起因するスプリアスを有し、基本
波周波数／２及びその３次高調波による大きな
スプリアスを発生してしまうという問題があつ
た。 Therefore, there is a spurious due to the thickness shear mode whose fundamental wave is approximately half the selected center frequency in thickness longitudinal vibration /2, and a large spurious is generated due to the fundamental frequency /2 and its third harmonic. I had a problem with it.
そこで本考案の課題は上述する問題点を解決
し、スプリアス、特に選択中心周波数の約半分
の基本周波数／２及びその３次高調波によるス
プリアスを低減させた複数素子型の圧電フイルタ
を提供することである。 Therefore, an object of the present invention is to provide a multi-element piezoelectric filter that solves the above-mentioned problems and reduces spurious, especially spurious due to the fundamental frequency/2, which is about half the selected center frequency, and its third harmonic. It is.
＜課題を解決するための手段＞
上述した課題解決のため、本考案は、同一の圧
電磁器基板上に複数のフイルタ素子を有する圧電
フイルタであつて、
前記フイルタ素子のそれぞれは、前記圧電磁器
基板の厚み方向の両面に駆動電極を有し厚み方向
の振動を利用するようになつており、
前記駆動電極は、少なくとも一対の分割電極
と、共通電極とを含み、前記分割電極のそれぞれ
が前記圧電磁器基板の一面側で間隔を隔てて対向
配置され、前記共通電極が前記圧電磁器基板の他
面側で前記分割電極と共通に対向するように配置
され引出電極により他の電極に接続されており、
前記フイルタ素子のうち、互いに隣接するフイ
ルタ素子は、前記分割電極の少なくとも一つが
各々から導かれた引出電極により互いに接続され
ており、
前記分割電極から導かれた前記引出電極のそれ
ぞれは、前記共通電極の前記引出電極に対して不
平行で、かつ、互いに不平行であること
を特徴とする。<Means for Solving the Problems> In order to solve the above problems, the present invention provides a piezoelectric filter having a plurality of filter elements on the same piezoelectric ceramic substrate, wherein each of the filter elements is connected to the piezoelectric ceramic substrate. drive electrodes are provided on both sides in the thickness direction to utilize vibration in the thickness direction, and the drive electrode includes at least one pair of divided electrodes and a common electrode, and each of the divided electrodes is connected to the piezoelectric They are arranged opposite to each other at a distance on one side of the piezoelectric ceramic substrate, and the common electrode is arranged so as to commonly face the divided electrodes on the other side of the piezoelectric ceramic substrate, and is connected to another electrode by an extraction electrode. , among the filter elements, filter elements that are adjacent to each other are connected to each other by an extraction electrode from which at least one of the divided electrodes is led, and each of the extraction electrodes led from the divided electrode is connected to the The common electrode is non-parallel to the extraction electrode and non-parallel to each other.
＜作用＞
フイルタ素子のうち、互いに隣接するフイルタ
素子は、分割電極の少なくとも一つが各々から導
かれた引出電極により互いに接続されており、分
割電極から導かれた引出電極のそれぞれは、共通
電極の引出電極に対して不平行であるから、分割
電極の引出電極と、共通電極から導かれた引出電
極との間の距離が短くならざるを得ない複数素子
型の圧電フイルタにおいて、圧電磁器基板の厚み
方向に対して垂直方向となる電界成分が小さくな
り、基本周波数／２及びその３次高調波のスプ
リアスが小さくなる。<Function> Among the filter elements, filter elements that are adjacent to each other are connected to each other by an extraction electrode from which at least one of the divided electrodes is led, and each of the extraction electrodes led from the divided electrode is connected to the common electrode. In a multi-element piezoelectric filter, the distance between the extraction electrode of the divided electrode and the extraction electrode led from the common electrode must be shortened because the extraction electrode is non-parallel to the extraction electrode. The electric field component in the direction perpendicular to the thickness direction becomes smaller, and the spurious of the fundamental frequency /2 and its third harmonic becomes smaller.
分割電極から導かれた引出電極は、互いに不平
行であるから、引出電極相互間の距離が短くなら
ざるを得ない複数素子型の圧電フイルタにおい
て、圧電磁器基板の厚み方向に対して垂直方向と
なる電界成分が小さくなり、基本周波数／２及
びその３次高調波のスプリアスが一層小さくな
る。分割電極の引出電極数は共通電極の引出電極
数よりも多くなるから、分割電極の引出電極を互
いに不平行とすることにより、共通電極側の引出
電極相互を不平行にする場合よりも有効なスプリ
アス低減効果が得られる。 Since the extraction electrodes led from the divided electrodes are non-parallel to each other, in a multi-element piezoelectric filter, the distance between the extraction electrodes must be shortened. The electric field component becomes smaller, and the spurious at the fundamental frequency /2 and its third harmonic becomes even smaller. Since the number of lead electrodes of the split electrode is greater than the number of lead electrodes of the common electrode, making the lead electrodes of the split electrode non-parallel to each other is more effective than making the lead electrodes of the common electrode side non-parallel. A spurious reduction effect can be obtained.
＜実施例＞
第１図は本考案に係る圧電フイルタの平面図、
第２図は同じくその底面図である。図において、
第４図及び第５図と同一の参照符号は同一性ある
構成部分を示している。この実施例では、３素子
型圧電フイルタを示し、圧電磁器基板１２の一面
に、共通電極５１〜７１を形成すると共に、反対
側の面上の共通電極５１〜７１の配設位置と対向
する位置に、分割電極５２，５３〜７２，７３を
形成した構造となつている。<Example> Fig. 1 is a plan view of a piezoelectric filter according to the present invention;
FIG. 2 is also a bottom view. In the figure,
The same reference numerals as in FIGS. 4 and 5 indicate identical components. In this embodiment, a three-element piezoelectric filter is shown, and common electrodes 51 to 71 are formed on one surface of a piezoelectric ceramic substrate 12, and the common electrodes 51 to 71 are formed at positions opposite to the arrangement positions of the common electrodes 51 to 71 on the opposite surface. It has a structure in which divided electrodes 52, 53 to 72, 73 are formed.
フイルタ素子５〜７のうち、互いに隣接するフ
イルタ素子５，６は、分割電極５３と分割電極６
２とが、各々から導かれた引出電極５３１，６２
１により互いに接続されている。分割電極５３か
ら導かれた引出電極５３１及び分割電極６２から
導かれた引き出し電極６２１は、共通電極５１，
６１の引出電極５１１，６１１に対して不平行で
ある。このような構造であると、分割電極５３，
６２の引出電極５３１，６２１と、共通電極５
１，６１から導かれた引出電極５１１，６１１と
の間の距離が短くならざるを得ない複数素子型の
圧電フイルタにおいて、圧電磁器基板１２の厚み
方向に対して垂直方向となる電界成分が小さくな
り、基本周波数／２及びその３次高調波のスプ
リアスが小さくなる。 Among the filter elements 5 to 7, the filter elements 5 and 6 that are adjacent to each other have a divided electrode 53 and a divided electrode 6.
2 are lead-out electrodes 531 and 62 led from each
1 are connected to each other. The extraction electrode 531 led from the divided electrode 53 and the extraction electrode 621 led from the divided electrode 62 are connected to the common electrode 51,
It is non-parallel to the extraction electrodes 511 and 611 of No. 61. With such a structure, the divided electrodes 53,
62 extraction electrodes 531, 621 and the common electrode 5
In a multi-element piezoelectric filter in which the distance between the extraction electrodes 511 and 611 led from the piezoelectric ceramic substrate 12 and the lead electrodes 511 and 611 must be shortened, the electric field component in the direction perpendicular to the thickness direction of the piezoelectric ceramic substrate 12 is small. Therefore, the spurious of the fundamental frequency /2 and its third harmonic becomes small.
互いに隣接するフイルタ素子６，７において
も、分割電極６３と分割電極７３とが、各々から
導かれた引出電極６３１，７２１により互いに接
続されている。分割電極６３から導かれた引出電
極６３１及び分割電極７２から導かれた引き出し
電極７２１は、共通電極６１，７１の引出電極６
１１，７１１に対して不平行である。従つて、隣
接するフイルタ素子６，７においても同様の作用
効果が得られる。 Also in the filter elements 6 and 7 adjacent to each other, the divided electrodes 63 and 73 are connected to each other by extraction electrodes 631 and 721 led from each. The extraction electrode 631 led from the divided electrode 63 and the extraction electrode 721 led from the divided electrode 72 are the same as the extraction electrode 6 of the common electrodes 61 and 71.
11,711. Therefore, similar effects can be obtained in the adjacent filter elements 6 and 7 as well.
分割電極５３，６２から導かれた引出電極５３
１，６２１は、互いに不平行である。分割電極６
３，７２から導かれた引き出し電極６３１，７２
１も互いに不平行になつている。このような構造
であると、引出電極５３１−６２１及び６３１−
７２１の相互間の距離が短くならざるを得ない複
数素子型の圧電フイルタにおいて、圧電磁器基板
１２の厚み方向に対して垂直方向となる電界成分
が小さくなり、基本周波数／２及びその３次高
調波のスプリアスが一層小さくなる。 Extracting electrode 53 led from split electrodes 53 and 62
1,621 are non-parallel to each other. Split electrode 6
Extraction electrodes 631, 72 led from 3, 72
1 are also non-parallel to each other. With such a structure, the extraction electrodes 531-621 and 631-
In a multi-element piezoelectric filter in which the distance between 721 must be shortened, the electric field component in the direction perpendicular to the thickness direction of the piezoelectric ceramic substrate 12 becomes small, and the fundamental frequency /2 and its third harmonic are reduced. Wave spurious becomes even smaller.
分割電極５２〜７３の引出電極数５２１〜７３
１は共通電極５１〜７１の引出電極５１１〜７１
１よりも多くなるから、分割電極５２〜７３の引
出電極５２１〜７３１を互いに不平行とすること
により、共通電極５１〜７１側の引出電極５１１
〜７１１の相互を不平行にする場合よりも有効な
スプリアス低減効果が得られる。 Number of extraction electrodes of divided electrodes 52 to 73: 521 to 73
1 is the extraction electrode 511-71 of the common electrode 51-71
1, so by making the extraction electrodes 521 to 731 of the divided electrodes 52 to 73 non-parallel to each other, the extraction electrode 511 on the common electrodes 51 to 71 side
A more effective spurious reduction effect can be obtained than in the case where .about.711 are made non-parallel to each other.
この実施例では、共通電極５１及び７１の引出
電極５１１，７１１を、圧電磁器基板１２の下側
中央部に設けた端子電極２，４に向かつて斜めに
傾斜するパターンとして形成する一方、圧電磁器
基板１２の他面上でギヤツプを介して対向する分
割電極５２と５３，６２と６３及び７２と７３の
各引出電極５２１，５３１，６２１，６３１，７
２１，７３１を、互いに八の字状に対向するパタ
ーンとして形成してあり、分割電極５２，７３か
ら導かれた引出電極５２１，７３１も他の引出電
極と不平行になつている。 In this embodiment, the lead electrodes 511 and 711 of the common electrodes 51 and 71 are formed in a pattern that is obliquely inclined toward the terminal electrodes 2 and 4 provided at the lower central part of the piezoelectric ceramic substrate 12. Each extraction electrode 521, 531, 621, 631, 7 of the divided electrodes 52 and 53, 62 and 63, and 72 and 73 faces each other with a gap on the other surface of the substrate 12.
21 and 731 are formed in a pattern that faces each other in a figure-eight shape, and the extraction electrodes 521 and 731 led from the divided electrodes 52 and 73 are also non-parallel to the other extraction electrodes.
次に実測データを挙げて本考案の効果を更に具
体的に説明する。第６図は第３図及び第４図に示
した従来の３素子型圧電フイルタのスプリアス特
性図、第７図は第１図及び第２図に示した本考案
に係る圧電フイルタのスプリアス特性図である。
これらの実測データは選択中心周波数10.7MHzと
した場合のスプリアス特性図である。 Next, the effects of the present invention will be explained in more detail by citing actual measurement data. FIG. 6 is a spurious characteristic diagram of the conventional three-element piezoelectric filter shown in FIGS. 3 and 4, and FIG. 7 is a spurious characteristic diagram of the piezoelectric filter according to the present invention shown in FIGS. 1 and 2. It is.
These measured data are spurious characteristic diagrams when the selected center frequency is 10.7MHz.
第６図及び第７図を比較すると、基本周波数
4.55MHzでのスプリアスSP1は、従来のものでは
約−38dBであるが、本考案では約−45dBであ
り、約7dBの改善が見られる。また３次高調波
13.5MHzでのスプリアスSP2は、従来のものは約
−55dBであるが、本考案では約−65dBであり、
約10dBの改善となる。 Comparing Figures 6 and 7, we find that the fundamental frequency
The spurious SP 1 at 4.55 MHz is about -38 dB in the conventional model, but it is about -45 dB in the present invention, which is an improvement of about 7 dB. Also, the third harmonic
The spurious SP 2 at 13.5MHz is about -55dB in the conventional model, but it is about -65dB in the present invention.
This is an improvement of approximately 10dB.
以上、３素子型圧電フイルタを例にとつて説明
したが、２素子型或いは４素子型等の圧電フイル
タにおいても同様に適用が可能であり、同様の作
用効果が得られる。 Although the above description has been made using a three-element type piezoelectric filter as an example, the present invention can be similarly applied to a two-element type or four-element type piezoelectric filter, and similar effects can be obtained.
＜考案の効果＞
以上述べたように、本考案によれば、次のよう
な効果が得られる。<Effects of the invention> As described above, according to the invention, the following effects can be obtained.
(a) フイルタ素子のうち、互いに隣接するフイル
タ素子は、分割電極の少なくとも一つが各々か
ら導かれた引出電極により互いに接続されてお
り、分割電極から導かれた引出電極のそれぞれ
は、共通電極の引出電極に対して不平行である
から、分割電極の引出電極と、共通電極から導
かれた引出電極との間の距離が短くならざるを
得ない複数素子型の圧電フイルタにおいて、圧
電磁器基板の厚み方向に対して垂直方向となる
電界成分を低下させ、基本周波数／２及びそ
の３次高調波のスプリアスを低減させた複数素
子型の圧電フイルタを提供できる。(a) Among the filter elements, adjacent filter elements are connected to each other by an extraction electrode extending from at least one of the split electrodes, and each of the extraction electrodes extending from the split electrodes is non-parallel to the extraction electrode of the common electrode. Therefore, in a multiple-element type piezoelectric filter in which the distance between the extraction electrode of the split electrode and the extraction electrode extending from the common electrode is inevitably short, it is possible to provide a multiple-element type piezoelectric filter in which the electric field component perpendicular to the thickness direction of the piezoelectric ceramic substrate is reduced, and spurious responses of half the fundamental frequency and its third harmonic are reduced.
(b) 分割電極から導かれた引出電極は、互いに不
平行であるから、引出電極相互間の距離が短く
ならざるを得ない複数素子型の圧電フイルタに
おいて、圧電磁器基板の厚み方向に対して垂直
方向となる電界成分が小さく、基本周波数／
２及びその３次高調波のスプリアスの一層小さ
な複数素子型の圧電フイルタを提供できる。(b) Since the extraction electrodes led from the divided electrodes are nonparallel to each other, the distance between the extraction electrodes must be shortened in the thickness direction of the piezoelectric ceramic substrate in a multi-element piezoelectric filter. The electric field component in the vertical direction is small, and the fundamental frequency /
A multi-element piezoelectric filter with smaller second and third harmonic spurious waves can be provided.
(c) 分割電極の引出電極数は共通電極の引出電極
数よりも多くなるから、分割電極の引出電極を
互いに不平行とすることにより、共通電極側の
引出電極相互を不平行にする場合よりも有効な
スプリアス低減効果を奏する複数素子型の圧電
フイルタを提供できる。(c) Since the number of lead electrodes of the split electrode is greater than the number of lead electrodes of the common electrode, by making the lead electrodes of the split electrode non-parallel to each other, it is easier than making the lead electrodes on the common electrode side non-parallel to each other. It is also possible to provide a multi-element piezoelectric filter that exhibits an effective spurious reduction effect.
第１図は本考案に係る３素子型圧電フイルタの
平面図、第２図は同じくその底面図、第３図は３
素子型圧電フイルタの電気的等価回路図、第４図
は第３図に示した３素子型圧電フイルタの具体的
な構造を示す平面図、第５図は同じくその底面
図、第６図は第３図及び第４図に示した従来の３
素子型圧電フイルタのスプリアス特性図、第７図
は本考案に係る圧電フイルタのスプリアス特性図
である。
５，６，７，８……フイルタ素子、１２……基
板、５１，６１，７１，８１……共通電極、５
２，５３，６２，６３，７２，７３……分割電
極、５１１，６１１，７１１，５２１，５３１，
６２１，６３１，７２１，７３１……引出電極。
Fig. 1 is a plan view of a three-element piezoelectric filter according to the present invention, Fig. 2 is a bottom view thereof, and Fig. 3 is a three-element piezoelectric filter according to the present invention.
An electrical equivalent circuit diagram of an element type piezoelectric filter, FIG. 4 is a plan view showing the specific structure of the three element type piezoelectric filter shown in FIG. 3, FIG. 5 is a bottom view thereof, and FIG. Conventional 3 shown in Figures 3 and 4
FIG. 7 is a spurious characteristic diagram of the piezoelectric filter according to the present invention. 5, 6, 7, 8... Filter element, 12... Substrate, 51, 61, 71, 81... Common electrode, 5
2, 53, 62, 63, 72, 73... divided electrode, 511, 611, 711, 521, 531,
621, 631, 721, 731... Extraction electrode.
Claims (1)
有する圧電フイルタであつて、 前記フイルタ素子のそれぞれは、前記圧電磁器
基板の厚み方向の両面に駆動電極を有し厚み方向
の振動を利用するようになつており、 前記駆動電極は、少なくとも一対の分割電極
と、共通電極とを含み、前記分割電極のそれぞれ
が前記圧電磁器基板の一面側で間隔を隔てて対向
配置され、前記共通電極が前記圧電磁器基板の他
面側で前記分割電極と共通に対向するように配置
され引出電極により他の電極に接続されており、 前記フイルタ素子のうち、互いに隣接するフイ
ルタ素子は、前記分割電極の少なくとも一つが
各々から導かれた引出電極により互いに接続され
ており、 前記分割電極から導かれた前記引出電極のそれ
ぞれは、前記共通電極の前記引出電極に対して不
平行で、かつ、互いに不平行であること を特徴とする圧電フイルタ。[Claims for Utility Model Registration] A piezoelectric filter having a plurality of filter elements on the same piezoelectric ceramic substrate, each of the filter elements having drive electrodes on both sides in the thickness direction of the piezoelectric ceramic substrate, The driving electrode includes at least one pair of divided electrodes and a common electrode, and each of the divided electrodes is arranged opposite to each other at a distance on one side of the piezoelectric ceramic substrate. the common electrode is arranged on the other side of the piezoelectric ceramic substrate so as to commonly face the divided electrodes and is connected to another electrode by a lead electrode, and among the filter elements, filter elements adjacent to each other At least one of the divided electrodes is connected to each other by an extraction electrode led from each, and each of the extraction electrodes led from the divided electrode is non-parallel to the extraction electrode of the common electrode. , and are non-parallel to each other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984135602U JPH0543538Y2 (en) | 1984-09-06 | 1984-09-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984135602U JPH0543538Y2 (en) | 1984-09-06 | 1984-09-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6150332U JPS6150332U (en) | 1986-04-04 |
| JPH0543538Y2 true JPH0543538Y2 (en) | 1993-11-02 |
Family
ID=30694085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984135602U Expired - Lifetime JPH0543538Y2 (en) | 1984-09-06 | 1984-09-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0543538Y2 (en) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS596008Y2 (en) * | 1977-05-04 | 1984-02-24 | 能登電子工業株式会社 | piezoelectric device |
-
1984
- 1984-09-06 JP JP1984135602U patent/JPH0543538Y2/ja not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6150332U (en) | 1986-04-04 |
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