JPS5894215A - Edge mode ceramic filter - Google Patents
Edge mode ceramic filterInfo
- Publication number
- JPS5894215A JPS5894215A JP19167881A JP19167881A JPS5894215A JP S5894215 A JPS5894215 A JP S5894215A JP 19167881 A JP19167881 A JP 19167881A JP 19167881 A JP19167881 A JP 19167881A JP S5894215 A JPS5894215 A JP S5894215A
- Authority
- JP
- Japan
- Prior art keywords
- electrodes
- electrode
- edge
- driving
- terminals
- 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
- 239000000919 ceramic Substances 0.000 title claims abstract description 29
- 230000010355 oscillation Effects 0.000 abstract 1
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 101150064138 MAP1 gene Proteins 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
- H03H9/46—Filters
- H03H9/54—Filters comprising resonators of piezoelectric or electrostrictive material
- H03H9/56—Monolithic crystal filters
- H03H9/562—Monolithic crystal filters comprising a ceramic piezoelectric layer
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)
Abstract
Description
【発明の詳細な説明】
本発明はＡＭラノオの中間周波数増幅回路などに用いら
れるセラミックフィルタに関するもので。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ceramic filter used in AM Ranoo's intermediate frequency amplification circuit and the like.
特にスジリアス特性を改善を目的としたエッノモードセ
ラミックフィルタに係る。In particular, the present invention relates to an echnomode ceramic filter that aims to improve streak characteristics.
本発明者らのうち清水洋他は特願昭５４−１５６０６８
号（特開昭５６−７９５１７号）Ｋエッノモードセラミ
ックフィルタとして、矩形圧電磁器板のエツジモード振
動を利用し、磁器板の支持やリード線の堰付けの容易な
、信頼性の高いセラミックフィルタを提案した。Among the present inventors, Hiroshi Shimizu et al. applied for patent application No. 54-156068.
No. (Japanese Unexamined Patent Publication No. 56-79517) A highly reliable ceramic filter that utilizes the edge mode vibration of a rectangular piezoelectric ceramic plate and is easy to support the ceramic plate and dam the lead wires. Proposed.
矩形圧電磁器板のエツジモード振動における面積歪分布
は第１図に示す如く端部近傍のみが振動しておシ、端部
から幅寸法のおよそ１．５倍以上の部分はほとんど振動
しておらず、その部分を固定してもエツジモード振動に
はほとんど影響しないばかシか、固定することによ９幅
振動や長さ振動などのスノリアス振動を抑制することが
できる。As shown in Figure 1, the areal strain distribution in edge mode vibration of a rectangular piezoelectric ceramic plate is such that only the vicinity of the edge vibrates, and the area approximately 1.5 times the width or more from the edge hardly vibrates. Although fixing that part has little effect on edge mode vibration, fixing it can suppress snorious vibrations such as 9-width vibration and length vibration.
なお図中の数値は面積歪の相対値を示す。先の特願昭５
４−１５６０６８号に示されている代表的な工７ノモー
ドセラミックフィルタの構成例を第２図および第３図に
示も第２図および第３図において（ａ）は表面電極（ｂ
）は裏面電極（Ｃ）は駆動電極部の断面模型図である。Note that the numerical values in the figure indicate relative values of areal strain. The previous patent application in 1973
4-156068, an example of the construction of a typical 7-mode ceramic filter is shown in FIGS. 2 and 3. In FIGS.
) is a cross-sectional model diagram of the back electrode (C) is a drive electrode portion.
第２図において駆動電極２ａ ｒ ２ｂおよびこれらと
対向する駆動電極３は概略半円状をしておシ。In FIG. 2, the drive electrodes 2a r 2b and the drive electrode 3 facing them are approximately semicircular.
第１図に示したエツジモード振動の面積歪の大きな部分
に対応した形状となっておシエ、ノモード振動を効率的
に励振することができる。The shape corresponds to the area where the area strain of edge mode vibration is large as shown in FIG. 1, and it is possible to efficiently excite sheer and no mode vibrations.
一方策３図においては第２図と同様の半円状の駆動電極
６ａ、６ｂおよび４に加えて第１図において面積型の符
号が前記半円電極部と逆の符号となっている位置に対向
してそれぞれ逆位相駆動用補助電極５ａ、７ａおよび５
ｂ 、７ｂが形成されており６ａと７ａおよび６ｂと７
ｂは電気的に接続されている。第３図（ｃ）に示すよう
に半円状電極４をアース電極逆位相駆動用補助電極５ａ
および５ｂをそれぞれ人・出力電極とした場合、半円電
極部と逆位相駆動用補助電極部の電界の向きが逆向きに
なるため第２図の半円駆動電極のみの場合に比べてさら
に効率良く工、ノモード振動を励振することができる。On the other hand, in FIG. 3, in addition to semicircular drive electrodes 6a, 6b, and 4 similar to those in FIG. Auxiliary electrodes 5a, 7a and 5 for opposite phase driving, respectively.
b, 7b are formed, 6a and 7a and 6b and 7
b is electrically connected. As shown in FIG. 3(c), the semicircular electrode 4 is connected to the ground electrode and the auxiliary electrode 5a for reverse phase driving.
When 5b and 5b are used as the human and output electrodes, the direction of the electric field of the semicircular electrode part and the auxiliary electrode part for anti-phase drive are opposite, so it is more efficient than the case of only the semicircular drive electrode in Fig. 2. It is possible to successfully excite no-mode vibrations.
第４図および第５図はそれぞれ第２図および第３図に示
した工、ノモードセラミノクフィルタのフィルタ特性例
を示し、（ａ）は通過域特性（ｂ）はスプリアス特性で
ある。ここで圧電磁器板の寸法は幅３１柄長さ９団厚さ
０．２ｍで中心周波数は約４５５ｋＨｚである諒４図と
第５図を比較すると半円駆動電極のフィルタと逆位相駆
動用補助電極部のフィルタ特性にはそれぞれ次の■、■
に示すような特徴がある。FIGS. 4 and 5 show examples of filter characteristics of the no-mode ceramic filter shown in FIGS. 2 and 3, respectively, where (a) is a passband characteristic and (b) is a spurious characteristic. Here, the dimensions of the piezoelectric ceramic plate are width 31, handle length 9, thickness 0.2 m, and the center frequency is approximately 455 kHz.Comparing Figures 4 and 5, we can see that the filter has a semicircular drive electrode and the auxiliary electrode for anti-phase drive. The filter characteristics of the parts are shown below.
It has the following characteristics.
■ 通過帯域幅は逆位相駆動用補助電極部のものが半円
駆動電極のみの場合の約１．３倍となる。(2) The passband width of the auxiliary electrode portion for anti-phase driving is approximately 1.3 times that of the case where only the semicircular driving electrode is used.
■ スプリアス特性については半円駆動電極の場合幅た
て振動の１次および２次のモードＷＥＩ 。■ Regarding spurious characteristics, in the case of a semicircular drive electrode, the first and second modes of vertical vibration WEI.
細２が大きなスプリアスになって現われ他のモードは小
さく抑制されているのに対して逆位相駆動用補助電極部
の場合幅たて振動の１次のモード■１はほとんど現われ
ないが幅たて振動の２次、３次および４次（７） モー
トＷＥ２ 、 ＷＦ２ 。Thin 2 appears as a large spurious and other modes are suppressed to a small level, whereas in the case of the auxiliary electrode section for anti-phase drive, the first-order mode of width vertical vibration ■1 hardly appears, but the width vertical vibration 2nd, 3rd and 4th order (7) motes of vibration WE2, WF2.
ＷＦ２がスプリアスとなって現われる。特に３次のスプ
リアスが大きい。WF2 appears as spurious. In particular, the third-order spurious is large.
本発明は以上に示したような駆動電極の種類による通過
帯域幅とスプリアス特性の違いに注目し。The present invention focuses on the differences in passband width and spurious characteristics depending on the type of drive electrode as described above.
半円駆動電極の場合よシも広い通過帯域幅を有し。The semicircular drive electrode also has a wide passband width.
しかもスプリアス特性に関してはこれら２種類の駆動電
極のフィルタよりも優れた特性を有するエッノモードセ
ラミックフィルタを提供せんとするものであり、矩形圧
電磁器板のエッノモード振動を利用し、振動による面積
型の大きな部分に対向した一対の入力電極と１対の出力
電極を形成し前記入力電極あるいは出力電極のいずれか
一方を逆位相駆動用補助電極を有する電極とし他の１方
を逆位相駆動用補助電極を有しない電極としたことを特
徴とするものである。Moreover, in terms of spurious characteristics, the aim is to provide an Echno-mode ceramic filter that has better characteristics than the filters using these two types of drive electrodes. A pair of input electrodes and a pair of output electrodes are formed opposite to each other in a large portion, and either the input electrode or the output electrode is an electrode having an auxiliary electrode for reverse phase drive, and the other one is an auxiliary electrode for reverse phase drive. The electrode is characterized by having no.
以下本発明について図面を用いて詳しく説明する。The present invention will be explained in detail below with reference to the drawings.
第６図は本発明の工、ノモードセラミ、クフィルタの電
極・やターンの構成例であり（ａ）は表面電極（ｂ）は
裏面電極（Ｃ）は（、） （ｂ）図のｃ −ｃ’線に沿
う断面図である。第６図において、矩形圧電磁器板の一
方の端部の表裏両面に対向してエツノモード振動を効率
的に励振するための半円をさらに２等分した形状の駆動
電極８ａ 、８ｂおよび９ａ、９ｂを形成し、端部の１
方の側部に対向する逆位相駆動用補助電極１０．１１を
形成して９ｂと１１を電気的に接続する。駆動電極８
ａ 、 −８ｂ 、 ９ ａおよびｌＯを矩形圧電磁器
板１のもう一方の端部に延長してそれぞれ外部リード端
子接続用の端子８ａ′。Figure 6 shows an example of the structure of the electrodes and turns of the present invention, the no-mode ceramic, and the filter. It is a sectional view along a line. In FIG. 6, drive electrodes 8a, 8b and 9a, 9b each have a semicircular shape further divided into two halves to efficiently excite Etsunomode vibration, facing both the front and back surfaces of one end of a rectangular piezoelectric ceramic plate. , and one of the ends
Opposite phase driving auxiliary electrodes 10.11 are formed on one side to electrically connect 9b and 11. Drive electrode 8
a, -8b, 9a and lO are extended to the other end of the rectangular piezoelectric ceramic plate 1 to form terminals 8a' for connecting external lead terminals, respectively.
８ ｂ’ 、 ９ ａ’および１０′とすると８ｂ’お
よびｇ ａ／をアースとじ８ａ’、１０’をそれぞれ人
・出力端子とする３端子型エツジモードセラミツクフイ
ルタを構成することができる。When 8b', 9a' and 10' are used, a three-terminal edge-mode ceramic filter can be constructed in which 8b' and ga/ are grounded and 8a' and 10' are output terminals, respectively.
第７図は本発明の３端子型エツジモードセラミンクフイ
ルタの電極／ぞター／の他の構成例であシ（ａ）は表面
電極（ｂ）は裏面電極（Ｃ）はＤ−Ｄ線に沿う断面図を
示す。第７図において、矩形圧電磁器板の一方の端部の
表面に半円状の駆動電極１２を形成し、裏面には前記半
円状の駆動電極１２に対向して半円電極をさらに分割し
た駆動電極１３ａ、１３ｂとする。また端部の一方の側
部に対向する逆位相駆動用補助電極１４．１５を形成し
１３ｂと１５を電気的に接続する。駆動電極１２，１３
ａおよび１４を矩形圧電磁器板１のもう１方の端部に延
長してそれぞれ外部リード端子接続用の端子１２’、１
３ａ’および１４′とすると１２′をアースとし１３
ａ’および１４’を入・出力端子とする３端子型エツノ
モードセラミンクフイルタを構成することができる。Figure 7 shows another example of the configuration of the electrodes of the three-terminal edge mode ceramic filter of the present invention. A cross-sectional view along the line is shown. In FIG. 7, a semicircular drive electrode 12 is formed on the surface of one end of a rectangular piezoelectric ceramic plate, and the semicircular electrode is further divided on the back surface facing the semicircular drive electrode 12. These are drive electrodes 13a and 13b. Further, auxiliary electrodes 14 and 15 for opposite phase driving are formed on one side of the end portion, and 13b and 15 are electrically connected. Drive electrodes 12, 13
a and 14 are extended to the other end of the rectangular piezoelectric ceramic plate 1 to form terminals 12' and 1 for external lead terminal connection, respectively.
3a' and 14', 12' is grounded and 13
A three-terminal type Etsuno mode ceramic filter can be constructed in which a' and 14' are input/output terminals.
第８図は填６図に示した電極パターンを用いたフィルタ
の特性例であり使用した圧電磁器板の材質および寸法は
第４図および第５図に示したフィルタと同じである。FIG. 8 shows an example of the characteristics of a filter using the electrode pattern shown in FIG. 6, and the material and dimensions of the piezoelectric ceramic plate used are the same as those of the filter shown in FIGS. 4 and 5.
第４図および第５図と第８図を比較するとまず通過帯域
幅に関しては本発明のフィルタは第５図に示した逆位相
駆動用補助電極付のフィルタの通過帯域幅とほぼ同じで
あり、スプリアス特性に関しては半円駆動電極のみの場
合および逆位相駆動用補助電極付の場合のと比較して特
性が大幅に改善されている。Comparing FIGS. 4 and 5 with FIG. 8, first of all, regarding the passband width, the filter of the present invention is almost the same as the passband width of the filter with the anti-phase driving auxiliary electrode shown in FIG. Concerning spurious characteristics, the characteristics are significantly improved compared to the case of using only semicircular drive electrodes and the case of using auxiliary electrodes for anti-phase drive.
すなわち本発明のエッノモードセラミックフィルタにお
いては、第６図および第７図かられかるように入力側と
出力側の電極の構造が異なり、その一方が逆位相駆動用
補助電極付の駆動電極となっているためエノノモードの
励振および検出に関しては単に半円駆動電極のみの場合
より効率が良くなり、その結果通過帯域幅が広くなり、
捷だ駆動電極・ぞターンの形状の差によってスジリアス
振動の励振および検出の感度が異なり、これが互いに打
ち消し合ってスプリアス特性が改善されることになる。In other words, in the Echnomode ceramic filter of the present invention, as can be seen from FIGS. 6 and 7, the structures of the input and output side electrodes are different, and one of them is a drive electrode with an auxiliary electrode for anti-phase drive. As a result, the excitation and detection of the enonomode is more efficient than using only semicircular drive electrodes, resulting in a wider passband width.
The sensitivities of excitation and detection of streaky vibrations differ depending on the shape of the twisted drive electrode and the grooves, and these cancel each other out to improve spurious characteristics.
第６図および第７図に示した本発明の実施例では半円電
極部８ａ 、８ｂおよび１３ａ 、１３ｂの形状をそれ
ぞれ等しくしているため逆位相駆動用補助電極によって
フィルタは非対称となる。しかし複数個のフィル夛を縦
続接続する場合に互いに入力側と出力側を同じタイプの
駆動電極とすることによりマツチングのとれた縦続接続
が可能となる。さらに半円電極部８ａと８ｂの寸法およ
び逆位相駆動用補助電極の形状・寸法を変化させること
により等測的にフィルタを対称型とすることも可能であ
る。In the embodiment of the present invention shown in FIGS. 6 and 7, the shapes of the semicircular electrode portions 8a, 8b and 13a, 13b are made equal, so that the filter becomes asymmetrical due to the auxiliary electrodes for anti-phase driving. However, when a plurality of filters are connected in cascade, a well-matched cascade connection is possible by using the same type of drive electrodes on the input and output sides. Furthermore, it is also possible to make the filter isometrically symmetrical by changing the dimensions of the semicircular electrode parts 8a and 8b and the shape and dimensions of the anti-phase drive auxiliary electrode.
以上示したように本発明によればスプリアス特性が大幅
に改善され必要なスプリアス減衰量をより少ない素子数
で実現することができる。As shown above, according to the present invention, the spurious characteristics are significantly improved and the necessary amount of spurious attenuation can be achieved with a smaller number of elements.
第１図はエッノモード振動の面積歪分布を示す。
第２図、第３図は従来の３端子型エツノモードセラミノ
クフイルタの電極構造例・第４図、第５図は従来の３端
子型エノノモードセラミソクフイルタの特性例、第６図
、第７図は本発明による３端子型エツノモードセラミツ
クフイルタの電極構造例を示す０第８図は第６図のフィ
ルタの特性図。
図において１・・・圧電磁器板、２ａ、２ｂ、３，４゜
６ａ、６ｂ、８ａ、８ｂ、９ａ、９ｂ、１２，１３ａ、
１３ｂ−−半円駆動電極、５ａ＋５ｂ、７ａ、７ｂ、１
０＋１１．１４゜１５−逆位相駆動用補助電極＋ ２ａ
’ 、 ２ｂ’ 、 ３．’ ｒ５ａ’ 、４’、５ｂ
’、８ａ’、８ｂ’、１０’、９ａ’、１４’、１２’
。
１３１１’・・外部リード接続用端子。
代理人（５路ｌ）ブ１理士芦 １） 用地１図
Ｘ２／２Ｈ
第４図
（ｂ）
ＫＨｚ
Ｈｚ
第６図
第７図Figure 1 shows the areal strain distribution of Echnomode vibration. Figures 2 and 3 are examples of the electrode structure of a conventional 3-terminal ethno-mode ceramic filter. Figures 4 and 5 are examples of characteristics of a conventional 3-terminal ethno-mode ceramic filter. FIG. 7 shows an example of the electrode structure of a three-terminal type ethno-mode ceramic filter according to the present invention. FIG. 8 is a characteristic diagram of the filter of FIG. 6. In the figure, 1...piezoelectric ceramic plate, 2a, 2b, 3, 4゜6a, 6b, 8a, 8b, 9a, 9b, 12, 13a,
13b--Semicircular drive electrode, 5a+5b, 7a, 7b, 1
0+11.14゜15-Auxiliary electrode for anti-phase drive + 2a
', 2b', 3. 'r5a', 4', 5b
', 8a', 8b', 10', 9a', 14', 12'
. 1311'...Terminal for external lead connection. Agent (5th route) 1) Land map 1 x 2/2H Figure 4 (b) KHz Hz Figure 6 Figure 7
Claims (1)
動による面積歪の大きな部分に、対向した一対の入力電
極と一対の出力電極を形成し、前記入力電極あるいは出
力電極のいずれか一方のみを逆位相駆動用補助電極を有
する電極としたことを特徴とするエッノモードセラミッ
クフィルタ。1. Utilizing the edge mode vibration of a rectangular piezoelectric ceramic plate, form a pair of input electrodes and a pair of output electrodes facing each other in the area where the area distortion caused by the vibration is large, and reverse only one of the input electrodes or the output electrodes. An echnomode ceramic filter characterized by having an electrode having an auxiliary electrode for phase drive.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19167881A JPS5894215A (en) | 1981-12-01 | 1981-12-01 | Edge mode ceramic filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19167881A JPS5894215A (en) | 1981-12-01 | 1981-12-01 | Edge mode ceramic filter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5894215A true JPS5894215A (en) | 1983-06-04 |
| JPS6410129B2 JPS6410129B2 (en) | 1989-02-21 |
Family
ID=16278631
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19167881A Granted JPS5894215A (en) | 1981-12-01 | 1981-12-01 | Edge mode ceramic filter |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5894215A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0519418U (en) * | 1991-08-28 | 1993-03-12 | 忠生 吉田 | Origami roofing roof mounting structure |
-
1981
- 1981-12-01 JP JP19167881A patent/JPS5894215A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6410129B2 (en) | 1989-02-21 |
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