JPS602663Y2 - piezoelectric filter - Google Patents
piezoelectric filterInfo
- Publication number
- JPS602663Y2 JPS602663Y2 JP12273079U JP12273079U JPS602663Y2 JP S602663 Y2 JPS602663 Y2 JP S602663Y2 JP 12273079 U JP12273079 U JP 12273079U JP 12273079 U JP12273079 U JP 12273079U JP S602663 Y2 JPS602663 Y2 JP S602663Y2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric
- ceramic plate
- piezoelectric filter
- filter
- forming agent
- 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
Links
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- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Description
【考案の詳細な説明】
本考案は、セラミック等の圧電板上に２以上の圧電振動
子を形威した圧電濾波器に関するもので、製造能率が高
くスプリアス特性の良好な小型圧電濾波器の提供を目的
とする。[Detailed description of the invention] The present invention relates to a piezoelectric filter in which two or more piezoelectric vibrators are formed on a piezoelectric plate made of ceramic or the like, and provides a small piezoelectric filter with high manufacturing efficiency and good spurious characteristics. With the goal.
従来この種の圧電濾波器は、第１図に示す様に分極した
１枚のセラミック板１の主表面に分割した出力電極７，
９を裏面には対向するアース電極９を設けてエネルギー
閉じ込め型圧電振動子１．Ｆ２をそのセラミック板上に
形威し、一方の圧電共振子Ｆ１の出力電極５と他方の圧
電共振子Ｆ２の入力電極７とをリード１１で結び、各共
振子Ｆ１． Ｆ２の残りの入出力電極及び対口するアー
ス電極からリードをセラミック板の端縁まで導出して端
子ピン３を半田接続し、前記圧電共振子Ｆ１．Ｆ２の振
動電極付近に空隙１３を設けてセラミック板全体を合成
樹脂１５で外装成型したものがよく知られている。Conventionally, this type of piezoelectric filter has an output electrode 7 divided on the main surface of a single polarized ceramic plate 1, as shown in FIG.
An energy trapping type piezoelectric vibrator 1.9 is provided with an opposing ground electrode 9 on its back surface. F2 is formed on the ceramic plate, and the output electrode 5 of one piezoelectric resonator F1 and the input electrode 7 of the other piezoelectric resonator F2 are connected by a lead 11, and each resonator F1. Leads are led from the remaining input/output electrodes of F2 and the opposing ground electrode to the edge of the ceramic plate, and the terminal pins 3 are connected by soldering to the piezoelectric resonators F1. A well-known example is one in which a gap 13 is provided near the vibrating electrode of F2 and the entire ceramic plate is externally molded with synthetic resin 15.
第２図は、セラミック板に。外装を施した圧電濾波器の
断面図を示す。Figure 2 shows the ceramic plate. FIG. 2 shows a cross-sectional view of a piezoelectric filter with a sheath.
そしてこの圧電濾波器は、セラミック板１に電極５，７
，９、リード１１や端子ピン３を設け、振動電極５．
７． ９及びその付近に空隙形成剤を滴下した後、その
セラミック板１を溶解した合成樹脂槽に漬侵して固化さ
せ、加熱によりその空隙形成剤を外装合成樹脂１５中へ
熱発散させるとか、溶剤中に漬侵して空隙形成剤を溶出
させて、前記第２図の如き空隙１３を有する圧電濾波器
を製造していた。This piezoelectric filter has electrodes 5 and 7 on the ceramic plate 1.
, 9, a lead 11 and a terminal pin 3 are provided, and a vibrating electrode 5.
7. 9 and its vicinity, the ceramic plate 1 is immersed in a melted synthetic resin tank to solidify it, and the void forming agent is heated to dissipate heat into the exterior synthetic resin 15, or it is placed in a solvent. A piezoelectric filter having voids 13 as shown in FIG. 2 was manufactured by immersing the filter in water to dissolve the void forming agent.
なお空隙１３を形成する理由は、外装材１５の押圧によ
って電極５．７．９の振動を防げない為である。Note that the reason for forming the void 13 is that the vibration of the electrodes 5.7.9 cannot be prevented by the pressure of the exterior material 15.
しかしながら従来の圧電濾波器においては、空隙形成の
為の形成剤をセラミック板１の小さな電極付近に滴下し
なければならず、極めて作業が煩雑で、量産性が悪く滴
下位置の不揃いも生じやすく、濾波特性が安定しない為
勢い特性の悪化をもたらしていた。However, in conventional piezoelectric filters, the forming agent for forming the voids must be dropped near the small electrodes of the ceramic plate 1, which is extremely complicated, makes mass production difficult, and tends to cause irregularities in the dropping positions. Since the filtering characteristics were not stable, the momentum characteristics deteriorated.
第５図は従来の圧電濾波器の示す濾波特性図である。FIG. 5 is a filtering characteristic diagram of a conventional piezoelectric filter.
もつともセラミック板１全体に空隙形成剤を塗布するこ
とも提案されていたが、圧電共振子Ｆ□の漏れ振動がセ
ラミック板１上を伝って直接性の圧電共振子Ｆ２に伝搬
してスプリアス特性を悪化させない様、やはり圧電共振
子Ｆ１．Ｆ２間のセラミック板上には外装樹脂１５を接
触させて押えることが必要となり、全体に空隙を設ける
ことは好ましくなく実現性に乏しかった。Although it has been proposed to apply a void-forming agent to the entire ceramic plate 1, the leakage vibration of the piezoelectric resonator F□ is transmitted on the ceramic plate 1 and directly propagates to the piezoelectric resonator F2, causing spurious characteristics. To avoid deterioration, the piezoelectric resonator F1. It is necessary to contact and press the exterior resin 15 on the ceramic plate between F2, and it is not preferable to provide a gap throughout the ceramic plate, which is impractical.
本考案は以上の欠点を改良した圧電濾波器の提供を目的
とする。The object of the present invention is to provide a piezoelectric filter that improves the above-mentioned drawbacks.
以下実施例を説明する。第３図は、本考案の一実施例を
示すもので、分極した長方形のセラミック板２１の主表
面に分割した入出力電極２７．２９を裏面には対向する
アース電極２９を設けて２つのエネルギー閉じ込め型圧
電振動子Ｆ３． Ｆ、を長手方向に並べて形成した圧電
濾波器において、一方の圧電振動子Ｆ３の出力電極２５
と他方の圧電振動子Ｆ４の入力電極２７とをセラミック
板１上のリード３１で接続し、各圧電振動子Ｆ３．Ｆ、
の他の入出力電極２７．２５及びアース電極２９からリ
ードを、圧電振動子Ｆ３． Ｆ４間のセラミック板の長
辺の端縁中程に導出して外部接続端子３５．３７に入出
力及びアース用端子ピン２３を半田付は接続するととも
に、圧電振動子Ｆ３． Ｆ、を端子ピン２３に対し長手
方向左右に分けてセラミック板２１上で端子ピン２３よ
り外側の位置に形成したことを特徴とする圧電濾波器を
示しといる。Examples will be described below. FIG. 3 shows an embodiment of the present invention, in which split input/output electrodes 27 and 29 are provided on the main surface of a polarized rectangular ceramic plate 21, and opposing ground electrodes 29 are provided on the back surface to provide two energy sources. Confined piezoelectric vibrator F3. In the piezoelectric filter formed by arranging F, in the longitudinal direction, the output electrode 25 of one piezoelectric vibrator F3
and the input electrode 27 of the other piezoelectric vibrator F4 are connected by the lead 31 on the ceramic plate 1, and each piezoelectric vibrator F3. F,
Connect the leads from the other input/output electrodes 27.25 and the ground electrode 29 to the piezoelectric vibrator F3. The input/output and grounding terminal pins 23 are led out to the middle of the long edge of the ceramic plate between F4 and connected to the external connection terminals 35 and 37 by soldering, and the piezoelectric vibrators F3. This is a piezoelectric filter characterized in that F is formed on the ceramic plate 21 on the left and right sides in the longitudinal direction with respect to the terminal pin 23 at positions outside the terminal pin 23.
もちろん製品化に当り、少なくとも振動電極２５，２７
，２９付近に空隙を形成してセラミック板全体を合成樹
脂で外装成型し、前記第２図に示す如く外装して完成す
る。Of course, in commercialization, at least the vibrating electrodes 25, 27
, 29 and then the entire ceramic plate is exterior molded with synthetic resin, and the exterior is completed as shown in FIG. 2.
第３図において、３３は、圧電振動子Ｆ３．Ｆ４を結ぶ
リード３１の途中に設けたコンデンサ電極で、対向面に
もアース側電極を設けて結合容量を得ている。In FIG. 3, 33 is a piezoelectric vibrator F3. A capacitor electrode is provided in the middle of the lead 31 connecting F4, and a ground side electrode is also provided on the opposite surface to obtain coupling capacitance.
本考案の圧電濾波器は、長方形のセラミック板１におい
て長手方向端縁中程に端子ピン２３をまとめて取付け、
圧電振動子Ｆ３． Ｆ、を端子ピン２３を中心に左右に
分けて形成しているので、端子ピン２３を支持してセラ
ミック板１の長手方向片側を溶解した空隙形成剤中へ漬
侵し、端子ピン２３を支えてセラミック板を回転させて
他の片側を漬侵することによって、左右に分けた圧電振
動子Ｆ３ｔ Ｆ４附近に空隙形成剤を塗布することがで
きるし、圧電振動子Ｆ３． Ｆ２間のセラミック板１上
には空隙形成剤が塗布されない。In the piezoelectric filter of the present invention, terminal pins 23 are collectively attached to the middle of the longitudinal edge of the rectangular ceramic plate 1.
Piezoelectric vibrator F3. Since F is formed in left and right parts with the terminal pin 23 in the center, one side of the ceramic plate 1 in the longitudinal direction is immersed in a molten void-forming agent to support the terminal pin 23. By rotating the ceramic plate and impregnating the other side, the gap forming agent can be applied near the left and right piezoelectric vibrators F3t and F4. No void forming agent is applied on the ceramic plate 1 between F2.
従って、従来の如く空隙形成剤を滴下するといった煩雑
な作業は不要で、単にセラミック板１の片側を漬侵する
だけで空隙形成剤を付けることができ、滴下位置に注意
を払う必要はなく作業能率が高く濾波特性が安定する。Therefore, there is no need for the complicated work of dropping a void-forming agent as in the conventional method, and the void-forming agent can be applied by simply soaking one side of the ceramic plate 1, and there is no need to pay attention to the dropping position. High efficiency and stable filtering characteristics.
しかも、空隙形成剤の塗布時端子ピン２３を中心にセラ
ミック板１を回転させるので、圧電振動子Ｆ、、 Ｆ、
には空隙形成剤が塗布されず、外装材１５が直接セラミ
ック板１に接触し、圧電振動子Ｆ、、 Ｆ、間の漏れ振
動伝搬が遮断される為、スプリアス特性が低下せず、良
好に保つことができる。Moreover, since the ceramic plate 1 is rotated around the terminal pin 23 when applying the void forming agent, the piezoelectric vibrators F, F,
Since no void-forming agent is applied to the ceramic plate 1, the sheathing material 15 directly contacts the ceramic plate 1, and the leakage vibration propagation between the piezoelectric vibrators F is blocked, so that the spurious characteristics do not deteriorate and are maintained in good condition. can be kept.
また、本考案は従来例と異なり、圧電振動子Ｆ３． Ｆ
、を端子ピン２３を中心に左右に分けてセラミック板上
に形成する為、セラミック板上圧電振動子Ｆ３． Ｆ、
間に端子ピン２３の取付部をセラミック板上深く挿入で
きる構造であることから、セラミック板１の高さ方向の
寸法を極めて底くできるし、端子ピン取付部が圧電振動
子Ｆ３．Ｆ４間の振動の漏れ伝搬防止の障害物としてス
プリアス改善の面から有効である。Moreover, the present invention differs from the conventional example in that the piezoelectric vibrator F3. F
, are formed on the ceramic plate in left and right parts with the terminal pin 23 in the center, so the piezoelectric vibrator F3. F,
Since the structure allows the mounting part of the terminal pin 23 to be inserted deeply between the ceramic plates, the height dimension of the ceramic plate 1 can be made extremely low, and the terminal pin mounting part can be inserted into the piezoelectric vibrator F3. It is effective in terms of spurious improvement as an obstacle to prevent leakage and propagation of vibration between F4.
所で本考案の実施に当り、セラミック板の形状・寸法や
圧電振動子の数も任意に決定できるし、圧電材料の選択
も自由である。When implementing the present invention, the shape and dimensions of the ceramic plate and the number of piezoelectric vibrators can be arbitrarily determined, and the piezoelectric material can also be selected freely.
出願人は、高さ４．５ｍｍ横１０．０ｍｍのセラミック
板上に圧電振動子２ケ形威して実験した所、第６図の濾
波特性を得た。The applicant conducted an experiment by placing two piezoelectric vibrators on a ceramic plate with a height of 4.5 mm and a width of 10.0 mm, and obtained the filtering characteristics shown in FIG. 6.
図からも明らかな様に、スプリアス特性が大巾に改善さ
れている。As is clear from the figure, the spurious characteristics have been greatly improved.
第４図は、本考案の圧電濾波器の製造方法一部を示す説
明図であり、前記第３図の様に長方形のセラミック板１
の長手方向に各々圧電振動子Ｆ３． Ｆ４を形成し、薄
い導電板を打ち抜いて入出力及びアース用の端子ピン２
３を形成したリードフレーム２２を作り、その入出力及
びアース用端子ピン２３を前記セラミック板の外部接続
端子３５．３７に接続後セラミック板ごとにリードフレ
ーム２２を切断しく第４図Ａ）、その端子ピン２３を中
心に左右のセラミック板を片方づつ空隙形成剤４３の溶
解した槽に漬侵して空隙形成剤４３をセラミック板１上
に付け（第６図Ｂ）、そのセラミック板全体に合成樹脂
外装を成型し、熱発散や溶出によりその空隙形成剤を除
却し、圧電濾波器を製造する。FIG. 4 is an explanatory diagram showing a part of the manufacturing method of the piezoelectric filter of the present invention, and as shown in FIG. 3, a rectangular ceramic plate 1
in the longitudinal direction of each piezoelectric vibrator F3. Form F4 and punch out a thin conductive plate to attach terminal pin 2 for input/output and grounding.
After making a lead frame 22 with a shape of 3 and connecting its input/output and grounding terminal pins 23 to the external connection terminals 35 and 37 of the ceramic plate, the lead frame 22 is cut for each ceramic plate. Centering the terminal pin 23, the left and right ceramic plates are immersed one by one in a bath in which the gap-forming agent 43 is dissolved to apply the gap-forming agent 43 onto the ceramic plate 1 (FIG. 6B), and the entire ceramic plate is coated with synthetic resin. A piezoelectric filter is manufactured by molding the outer casing and removing the pore-forming agent by heat dissipation or elution.
以上説明した様に、本考案は分極された圧電板上に複数
のエネルギー閉じ込め型圧電振動子を形成し、かつ端子
ピンを取付けて威る圧電濾波器において、圧電振動子を
端子ピンに対し左右に分けて圧電板上リード端子より外
側に形成したことを特徴とする圧電濾波器であることか
ら、製造が容易でかつ能率が高く、スプリアス特性等濾
波特性が良好な小型圧電濾波器を提供できる。As explained above, the present invention forms a plurality of energy trapping piezoelectric vibrators on a polarized piezoelectric plate, and in a piezoelectric filter in which a terminal pin is attached, the piezoelectric vibrators are placed on the left and right sides of the terminal pin. Since the piezoelectric filter is characterized in that the piezoelectric filter is formed on the outside of the lead terminal on the piezoelectric plate, it is possible to provide a small piezoelectric filter that is easy to manufacture, has high efficiency, and has good filtering characteristics such as spurious characteristics. .
第１図：従来の圧電濾波器を示す平面図。
第２図：圧電濾波器の断面図。
第３図二本考案の圧電濾波器の一実施例を示す平面図。
第４図二本考案の圧電濾波器の製造工程の一部を示す説
明図。
第５．６図：従来及び本考案の圧電濾波器の濾波特性図
。
１．２１：セラミック板、５，７，２５，２７：振動電
極、１５：外装材、２３：端子ピン、４３：空隙形成剤
、
４４：槽。FIG. 1: A plan view showing a conventional piezoelectric filter. Figure 2: Cross-sectional view of the piezoelectric filter. FIG. 3 is a plan view showing an embodiment of the piezoelectric filter of the present invention. FIG. 4 is an explanatory diagram showing part of the manufacturing process of the piezoelectric filter of the present invention. Figure 5.6: Filtering characteristic diagram of the conventional piezoelectric filter and the piezoelectric filter of the present invention. 1.21: Ceramic plate, 5, 7, 25, 27: Vibrating electrode, 15: Exterior material, 23: Terminal pin, 43: Gap forming agent, 44: Tank.
Claims (1)
振動子を形威し、かつ端子ピンを取付けて威る圧電濾波
器において、圧電振動子を端子ピンに対し左右に分けて
圧電板上の端子ピンより外側の位置に形威したことを特
徴とする圧電濾波器。In a piezoelectric filter in which multiple energy-trapped piezoelectric vibrators are formed on a polarized piezoelectric plate and terminal pins are attached, the piezoelectric vibrators are divided into left and right sides with respect to the terminal pins, and terminals on the piezoelectric plate are A piezoelectric filter characterized by a shape located outside the pin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12273079U JPS602663Y2 (en) | 1979-09-05 | 1979-09-05 | piezoelectric filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12273079U JPS602663Y2 (en) | 1979-09-05 | 1979-09-05 | piezoelectric filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5639733U JPS5639733U (en) | 1981-04-14 |
| JPS602663Y2 true JPS602663Y2 (en) | 1985-01-25 |
Family
ID=29354761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12273079U Expired JPS602663Y2 (en) | 1979-09-05 | 1979-09-05 | piezoelectric filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS602663Y2 (en) |
-
1979
- 1979-09-05 JP JP12273079U patent/JPS602663Y2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5639733U (en) | 1981-04-14 |
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