JPS61121513A - Control method for amplitude characteristics of surface wave filter - Google Patents
Control method for amplitude characteristics of surface wave filterInfo
- Publication number
- JPS61121513A JPS61121513A JP24291684A JP24291684A JPS61121513A JP S61121513 A JPS61121513 A JP S61121513A JP 24291684 A JP24291684 A JP 24291684A JP 24291684 A JP24291684 A JP 24291684A JP S61121513 A JPS61121513 A JP S61121513A
- Authority
- JP
- Japan
- Prior art keywords
- surface wave
- wave filter
- electrodes
- comb
- amplitude characteristics
- 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.)
- Pending
Links
Landscapes
- Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、映像機器等に使用される。表面波フィルタの
振幅特性調整方法に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is used in video equipment and the like. The present invention relates to a method for adjusting amplitude characteristics of a surface wave filter.
従来例の構成とその問題点
従来、表面波フィルタの振幅特性を変更するＫは、クシ
形電極を設計変更し、−から作りなおさねばならなかっ
た。つまり、設計変更して、くし形電極を作りなおすこ
とは、フォトエツチング用のフォトマスクを作りなおす
ことと同じであり、そのためには長時間が必要であった
。Conventional configuration and its problems Conventionally, in order to change the amplitude characteristics of a surface wave filter, the design of the comb-shaped electrode had to be changed and it had to be remade from scratch. In other words, changing the design and recreating the comb-shaped electrodes is the same as recreating a photomask for photoetching, which requires a long time.
発明の目的
本発明は、従来の問題点である−からの作りなおしを必
要とせず、簡単に、修正することができる振幅特性調整
方法を提供することを目的とする。OBJECTS OF THE INVENTION It is an object of the present invention to provide an amplitude characteristic adjustment method that can be easily corrected without requiring re-creation, which is a problem with the conventional method.
発明の構成
本発明は、上記目的を達成するために、圧電基板上に設
けた、くし形電極の一部分上に樹脂を塗布し、周波数−
振幅特性を修正する。この方法により簡単に振幅特性の
調整が可能となる。Structure of the Invention In order to achieve the above object, the present invention coats a resin on a portion of a comb-shaped electrode provided on a piezoelectric substrate, and
Modify the amplitude characteristics. This method makes it possible to easily adjust the amplitude characteristics.
実施例の説明
以下、本発明の実施例を第１図〜第３図を参照して、説
明する。DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 3.
まず、圧電基板１の上にアルミを蒸着等の方法で全面に
つけ、フォトリングラフイーの手法で、第１図の如き、
くし形電極２を作る。その後、圧電基板１の上（表面）
を伝搬する信号波（表面波）がその端面で反射すること
を防ぐ（減衰させる）ためアブソーバ３を塗布する。ア
ブソーバ３は、シリコンゴムとかエポキシ系の樹脂が良
い。First, aluminum is applied to the entire surface of the piezoelectric substrate 1 by a method such as vapor deposition, and then, using a photophosphorography method, as shown in FIG.
Make comb-shaped electrode 2. Then, on the piezoelectric substrate 1 (surface)
An absorber 3 is applied to prevent (attenuate) the signal wave (surface wave) propagating from being reflected at the end face. The absorber 3 is preferably made of silicone rubber or epoxy resin.
この状態で、設計した通りの周波数−振幅特性が得られ
れば良いが、例えば、第３図の破線Ａの如く、波形の頂
部にリップルが大きく重畳しているような場合、第２図
に示すように、アブソーバ３をくし形電極２の一部分４
上に塗布すると、第３図の実線Ｂのようにリップルの少
ない波形となる０
また、均一に同じ修正を全ての表面波フィルタチップに
行うには、アブソーバ３を、スクリーン印刷等の方法で
決められた面積、場所のくし形電極２上に塗布形成する
と良い。In this state, it is sufficient if the frequency-amplitude characteristics as designed can be obtained, but for example, if ripples are largely superimposed on the top of the waveform, as shown by the broken line A in Fig. 3, as shown in Fig. 2. As shown in FIG.
If applied on top of the surface wave filter, the waveform will have fewer ripples as shown by the solid line B in Fig. It is preferable to coat and form it on the comb-shaped electrode 2 in the area and location.
発明の効果
実施例で説明したように本発明は設計通シの特性が得ら
れないような場合、アブソーバをくし形電極の一部分上
に塗布することで、波形（振幅特性）を簡単に修正でき
ることになり、コスト′面で著しく有利とでき工業的価
値の大なるものである。Effects of the Invention As explained in the embodiments, the present invention has the advantage that when the designed characteristics cannot be obtained, the waveform (amplitude characteristics) can be easily modified by applying an absorber on a portion of the comb-shaped electrode. Therefore, it is extremely advantageous in terms of cost and has great industrial value.
第１図は本発明の表面波フィルタの振幅特性調整方法に
よる一実施例の平面図、第２図は他の実施例の平面図、
第３図は周波数−振幅特性図である。
１・・・・・・圧電基板、２・・・・・・くし形電極、
３・・・・・・アブソーバ、４・・・・・・アブソーバ
３の下のくし形電極。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名（Ｎ
−の
可禎１（−６FIG. 1 is a plan view of one embodiment of the method for adjusting amplitude characteristics of a surface wave filter of the present invention, FIG. 2 is a plan view of another embodiment,
FIG. 3 is a frequency-amplitude characteristic diagram. 1...Piezoelectric substrate, 2...Comb-shaped electrode,
3...Absorber, 4...Comb-shaped electrode under absorber 3. Name of agent Patent attorney Toshio Nakao and 1 other person (N-Kate 1 (-6)
Claims (1)
形電極の一部上に樹脂を塗布することを特徴とする表面
波フィルタの振幅特性調整方法。1. A method for adjusting amplitude characteristics of a surface wave filter, comprising applying resin on a part of the comb-shaped electrodes of the surface-wave filter including comb-shaped electrodes on a piezoelectric substrate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24291684A JPS61121513A (en) | 1984-11-16 | 1984-11-16 | Control method for amplitude characteristics of surface wave filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24291684A JPS61121513A (en) | 1984-11-16 | 1984-11-16 | Control method for amplitude characteristics of surface wave filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS61121513A true JPS61121513A (en) | 1986-06-09 |
Family
ID=17096116
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24291684A Pending JPS61121513A (en) | 1984-11-16 | 1984-11-16 | Control method for amplitude characteristics of surface wave filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61121513A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55151810A (en) * | 1979-05-15 | 1980-11-26 | Murata Mfg Co Ltd | Elastic surface wave filter |
-
1984
- 1984-11-16 JP JP24291684A patent/JPS61121513A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55151810A (en) * | 1979-05-15 | 1980-11-26 | Murata Mfg Co Ltd | Elastic surface wave filter |
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