JPH0238496Y2 - - Google Patents
Info
- Publication number
- JPH0238496Y2 JPH0238496Y2 JP574983U JP574983U JPH0238496Y2 JP H0238496 Y2 JPH0238496 Y2 JP H0238496Y2 JP 574983 U JP574983 U JP 574983U JP 574983 U JP574983 U JP 574983U JP H0238496 Y2 JPH0238496 Y2 JP H0238496Y2
- Authority
- JP
- Japan
- Prior art keywords
- piezoelectric plate
- piezoelectric
- plate
- main surface
- bending
- 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
- 238000005452 bending Methods 0.000 description 14
- 239000000919 ceramic Substances 0.000 description 5
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000007935 neutral effect Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
Description
【考案の詳細な説明】
技術分野
本考案は短冊状の圧電板の長さ振動を利用した
短冊状圧電共振子に関する。[Detailed Description of the Invention] Technical Field The present invention relates to a rectangular piezoelectric resonator that utilizes longitudinal vibration of a rectangular piezoelectric plate.
従来技術
従来より、この種の短冊状圧電共振子として
は、たとえば第１図ａ、第１図ｂおよび第１図ｃ
に示すように、ほゞ一定巾を有する短冊状の圧電
板１の一つの主面１ａにその巾方向の中央部を上
記圧電板１の一端から他端に走る凹溝２を設ける
とともに、上記一つの主面１ａに上記凹溝２で分
割される分割電極４，５を形成し、上記圧電板１
のいま一つの主面１ｂに全面電極６を形成して上
記圧電板１が圧電磁器板である場合Ｐで示すよう
に分極されてなるものが一般に知られている。Prior Art Conventionally, as this type of strip-shaped piezoelectric resonator, for example, Fig. 1a, Fig. 1b, and Fig. 1c
As shown in FIG. 1, a concave groove 2 is provided on one main surface 1a of a rectangular piezoelectric plate 1 having a substantially constant width, and a concave groove 2 running from one end of the piezoelectric plate 1 to the other end is provided in the center of the width direction. Split electrodes 4 and 5 divided by the groove 2 are formed on one main surface 1a, and the piezoelectric plate 1
It is generally known that the piezoelectric plate 1 is polarized as shown by P when the piezoelectric plate 1 is a piezoelectric ceramic plate by forming an entire surface electrode 6 on another main surface 1b.
ところで、上記の如き短冊状圧電共振子におい
て、第２図に示すように、入力端子７および出力
端子８から入力信号と出力信号とが逆位相となる
ような電界E1，E2が印加された場合、圧電板１
には、その長さ方向のベンデング振動モードが生
じる。このベンデング振動モードの高調波は、た
とえば圧電板１の長さが4.0mm、巾が0.6mm、厚み
が0.3mmのAM放送用の455キロヘルツ中間周波用
フイルタの場合、第３図に曲線l1で示すように、
1.5MHz近傍にスプリアスレスポンスとして現わ
れる問題があつた。 By the way, in the above-mentioned strip-shaped piezoelectric resonator, as shown in FIG. 2, electric fields E 1 and E 2 are applied from the input terminal 7 and the output terminal 8 so that the input signal and the output signal are in opposite phases. In this case, piezoelectric plate 1
, a bending vibration mode occurs in the longitudinal direction. For example, in the case of a 455 kHz intermediate frequency filter for AM broadcasting in which the piezoelectric plate 1 has a length of 4.0 mm, a width of 0.6 mm, and a thickness of 0.3 mm, the harmonics of this bending vibration mode are shown in the curve l 1 in Figure 3. As shown in
There was a problem that appeared as a spurious response near 1.5MHz.
考案の目的
本考案は上記問題を解消すべくなされたもので
あつて、短冊状の圧電板の長さ振動を利用した短
冊状圧電共振子において、圧電板に設けた凹溝を
その両端部で切り欠くことにより、圧電板の切込
み部近傍の質量付加効果によつて長さ方向のベン
デイングを分散させ、圧電板の長さベンデングに
よるスプリアスレスポンスを抑圧することを目的
としている。Purpose of the invention The present invention was made in order to solve the above problem. In a rectangular piezoelectric resonator that utilizes the length vibration of a rectangular piezoelectric plate, a concave groove provided in the piezoelectric plate is formed at both ends of the rectangular piezoelectric resonator. The purpose of the notch is to disperse bending in the length direction by the effect of adding mass near the notch of the piezoelectric plate, and to suppress spurious responses due to length bending of the piezoelectric plate.
実施例
以下、添付図面とともに本考案の実施例を説明
する。Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
第４図ａ、第４図ｂおよび第４図ｃに本考案の
実施例を示す。 Embodiments of the present invention are shown in FIGS. 4a, 4b and 4c.
第４図ａ、第４図ｂおよび第４図ｃに示す実施
例は、第１図ａ、第１図ｂおよび第１図ｃの短冊
状圧電共振子において、凹溝２の両端部を圧電板
１の一端および他端から夫々切り込んで切込み部
１１および１２を設けたものである。 The embodiments shown in FIG. 4a, FIG. 4b, and FIG. 4c are the piezoelectric resonators shown in FIG. 1a, FIG. 1b, and FIG. Cut portions 11 and 12 are provided by cutting from one end and the other end of the plate 1, respectively.
たゞし、上記第４図ａ、第４図ｂ、第４図ｃに
おいて、第１図ａ、第１図ｂおよび第１図ｃに対
応するものには同一の符号を付して示している。 However, in Fig. 4a, Fig. 4b, and Fig. 4c, those corresponding to Fig. 1a, Fig. 1b, and Fig. 1c are indicated with the same reference numerals. There is.
上記のように、圧電板１の凹溝２の両端部を上
記圧電板１の一端および他端から夫々切り込んで
切込み部１１および１２を設ければ、圧電板１の
両端部に上記切り込み部１１および１２で夫々分
離される圧電磁器板１の分離器１１ａ，１１ｂお
よび１２ａ，１２ｂが形成される。これら分離部
１１ａ，１１ｂおよび１２ａ，１２ｂには第５図
ａ，ｂに示すベンデングモードの中性軸AA（伸
縮がない軸）が切り欠きによつて存在しないため
Ｚ軸まわりのモーメントが生じない。つまりこれ
ら分離部１１ａ，１１ｂおよび１２ａ，１２ｂは
ベンデングモードに対して単なる質量付加とな
る。この質量付加効果によつて長さベンデングが
分散され、長さベンデングによるスプリアスレス
ポンスが抑圧される。 As described above, if the notches 11 and 12 are provided by cutting both ends of the groove 2 of the piezoelectric plate 1 from one end and the other end of the piezoelectric plate 1, respectively, the notches 11 and 12 are provided at both ends of the piezoelectric plate 1. Separators 11a, 11b and 12a, 12b of the piezoelectric ceramic plate 1 separated by 12 and 12 are formed. In these separation parts 11a, 11b and 12a, 12b, there is no neutral axis AA (axis that does not expand or contract) in the bending mode shown in FIGS. do not have. In other words, these separation parts 11a, 11b and 12a, 12b simply add mass to the bending mode. This mass addition effect disperses the length bending and suppresses spurious responses due to the length bending.
ちなみに、長さ4.0mm、巾0.6mm、厚さ0.3mmの圧
電磁器板１に切込み深さ0.4mmの切込み部１１，
１２を設けた場合、長さベンデングによるスプリ
アスレスポンスは、第３図で曲線l2で示すよう
に、従来のものよりも7dB程度改善されているこ
とが分る。 By the way, a cut portion 11 with a cut depth of 0.4 mm is made in a piezoelectric ceramic plate 1 with a length of 4.0 mm, a width of 0.6 mm, and a thickness of 0.3 mm.
12, the spurious response due to length bending is improved by about 7 dB compared to the conventional one, as shown by curve l2 in FIG.
考案の効果
以上、詳述したことからも明らかなように、本
考案は、短冊状の圧電板からなる短冊状圧電共振
子において、圧電板の凹溝の両端部に切込み部を
設けてこれら切込み部近傍の圧電板に長さ方向の
ベンデンが生じないようにしたから、切込み部近
傍の質量付加効果によつて長さベンデイングが分
散され、圧電板の長さベンデイングによるスプリ
アスレスポンスを抑圧することができる。Effects of the Invention As is clear from the above detailed description, the present invention provides a rectangular piezoelectric resonator made of a rectangular piezoelectric plate, in which notches are provided at both ends of the concave groove of the piezoelectric plate. Since bending in the length direction does not occur in the piezoelectric plate near the notch, length bending is dispersed by the effect of adding mass near the notch, and spurious responses due to length bending of the piezoelectric plate can be suppressed. can.
第１図ａ、第１図ｂおよび第１図ｃは夫々従来
の短冊状圧電共振子の平面図、正面図および側面
図、第２図は夫々第１図ａ、第１図ｂおよび第１
図ｃの短冊状圧電共振子の長さベンデングの説明
図、第３図は従来の短冊状圧電共振子と本考案に
係る短冊状圧電共振子のスプリアスレスポンスの
測定データの説明図、第４図ａ、第４図ｂおよび
第４図ｃは夫々本考案に係る短冊状圧電磁器共振
子の平面図、正面図および側面図である。第５図
ａ，ｂは短冊状圧電磁器共振子のベンデングモー
ドを表す図である。
１……圧電板（１ａ，１ｂ……主面）、２……
凹溝、４，５……分割電極、６……全面電極、１
１，１２……切込み部、AA……中性軸。
1a, 1b, and 1c are respectively a plan view, a front view, and a side view of a conventional strip-shaped piezoelectric resonator, and FIG.
Figure c is an explanatory diagram of the length bending of the strip-shaped piezoelectric resonator, Figure 3 is an explanatory diagram of measurement data of spurious responses of the conventional strip-shaped piezoelectric resonator and the strip-shaped piezoelectric resonator according to the present invention, and Figure 4 4a, FIG. 4b, and FIG. 4c are a plan view, a front view, and a side view, respectively, of a strip-shaped piezoelectric ceramic resonator according to the present invention. FIGS. 5a and 5b are diagrams showing bending modes of a strip-shaped piezoelectric ceramic resonator. 1...Piezoelectric plate (1a, 1b...principal surface), 2...
Concave groove, 4, 5...Divided electrode, 6...Full surface electrode, 1
1, 12...notch part, AA...neutral axis.
Claims (1)
面にその巾方向の中央部を上記圧電板の一端から
他端に走る凹溝を設けるとともに、上記一つの主
面に上記凹溝で分割される分割電極を形成し、上
記圧電板のいま一つの主面に全面電極を形成して
なる短冊状圧電共振子において、 その両端部の巾方向略中央部において、圧電板
の一つの主面からいま一つの主面に至るまで切込
みが設けられていることを特徴とする短冊状圧電
共振子。[Claims for Utility Model Registration] A recessed groove running from one end of the piezoelectric plate to the other end of the piezoelectric plate is provided in the center of the width direction on one main surface of a rectangular piezoelectric plate having a substantially constant width; In a rectangular piezoelectric resonator, in which divided electrodes divided by the grooves are formed on one main surface of the piezoelectric plate, and a full-surface electrode is formed on the other main surface of the piezoelectric plate, substantially the center in the width direction of both ends thereof. A rectangular piezoelectric resonator characterized in that a cut is provided from one main surface of the piezoelectric plate to the other main surface.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP574983U JPS59111323U (en) | 1983-01-18 | 1983-01-18 | Strip-shaped piezoelectric resonator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP574983U JPS59111323U (en) | 1983-01-18 | 1983-01-18 | Strip-shaped piezoelectric resonator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS59111323U JPS59111323U (en) | 1984-07-27 |
| JPH0238496Y2 true JPH0238496Y2 (en) | 1990-10-17 |
Family
ID=30137329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP574983U Granted JPS59111323U (en) | 1983-01-18 | 1983-01-18 | Strip-shaped piezoelectric resonator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59111323U (en) |
-
1983
- 1983-01-18 JP JP574983U patent/JPS59111323U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS59111323U (en) | 1984-07-27 |
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