JPH06140864A - Piezoelectric oscillator - Google Patents
Piezoelectric oscillatorInfo
- Publication number
- JPH06140864A JPH06140864A JP4282696A JP28269692A JPH06140864A JP H06140864 A JPH06140864 A JP H06140864A JP 4282696 A JP4282696 A JP 4282696A JP 28269692 A JP28269692 A JP 28269692A JP H06140864 A JPH06140864 A JP H06140864A
- Authority
- JP
- Japan
- Prior art keywords
- base substrate
- electrodes
- capacitor
- piezoelectric
- dielectric
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/18—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing mixtures of the silica-lime type
Abstract
Description
【０００１】[0001]
【産業上の利用分野】この発明は、セラミック等の圧電
素子を、誘電体ベース基板に積載した、コンデンサ内蔵
の圧電発振子に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piezoelectric oscillator having a built-in capacitor, in which a piezoelectric element such as ceramic is mounted on a dielectric base substrate.
【０００２】[0002]
【従来の技術】一般にセラミック発振子（圧電発振子）
を用いて発振回路を構成する場合がある。この種の発振
回路としては、図６に示すようにＣ−ＭＯＳインバータ
Ｎを利用するものがよく使用されており、又位相反転の
ため負荷容量（コンデンサ）Ｃ 1 、Ｃ2 が必要である。
従来、この負荷容量Ｃ1 、Ｃ2 を圧電発振子に内蔵し、
発振回路の設計を容易にしたものが使用されているが、
本件出願人は、負荷容量内蔵タイプで、しかも小型のも
のを得るために、図７、図８に示す圧電発振子をすでに
別に出願している。2. Description of the Related Art Generally, a ceramic oscillator (piezoelectric oscillator)
There is a case where the oscillator circuit is configured by using. This kind of oscillation
The circuit is a C-MOS inverter as shown in FIG.
The one using N is often used, and the phase inversion
Load capacity (capacitor) C 1, C2is necessary.
Conventionally, this load capacity C1, C2Built into the piezoelectric oscillator,
Although the one that facilitates the design of the oscillator circuit is used,
The applicant has a built-in load capacity type
In order to obtain the
I am applying separately.
【０００３】この圧電発振子１は、互いに所定の間隔を
置いて形成される電極３、４、５を持つベース基板２上
に、圧電セラミック素子６が積載されており、圧電セラ
ミック素子６の電極は、導電接着剤７によって、ベース
基板２の電極３、４に電気的に接続されている。ベース
基板２としては、誘電体セラミックが使用される。した
がって、ベース基板２の電極３と電極５、及びその間の
誘電体セラミックで、コンデンサＣ1 が、また電極４と
電極５及びその間の誘電体セラミックでコンデンサＣ2
が形成される。これら電極３、４、５を部品の外部電極
として使用する。また図示は省略しているが、ベース基
板２上に、圧電セラミック素子６を覆う上部ケースが載
せられ、ベース基板２とともにパッケージを形成してい
る。In this piezoelectric oscillator 1, a piezoelectric ceramic element 6 is mounted on a base substrate 2 having electrodes 3, 4, 5 formed at a predetermined distance from each other. Are electrically connected to the electrodes 3 and 4 of the base substrate 2 by the conductive adhesive 7. A dielectric ceramic is used as the base substrate 2. Thus, electrodes 3 and 5 of the base substrate 2, and between the dielectric ceramic, capacitor C 1 is also the electrodes 4 and 5 and the capacitor C 2 therebetween the dielectric ceramic
Is formed. These electrodes 3, 4, 5 are used as external electrodes of the component. Although not shown, an upper case that covers the piezoelectric ceramic element 6 is placed on the base substrate 2 to form a package together with the base substrate 2.
【０００４】[0004]
【発明が解決しようとする課題】上記した、すでに出願
の圧電発振子は、パッケージのベース基板を誘電体で形
成し、負荷容量コンデンサの誘電体として使用するもの
であるから、負荷内蔵型であるにも、かかわらず小型の
圧電発振子が得られる。しかし、この圧電発振子では、
パッケージのベース基板の側面及び下面にも電極が形成
され、パッケージの外部に露出した面においても、コン
デンサの機能を有する。そのため、容量の調整が困難と
なり、その対策として特殊な電極パターンを形成する必
要があるし、パッケージの外に露出した面、つまり、ベ
ース基板の下面及び側面において、湿度、汚れ等の環境
の影響を受け易く、容量の変動を起こし易く、信頼性に
乏しい、という問題がある。The above-mentioned already applied piezoelectric oscillator is of a built-in load type because the base substrate of the package is formed of a dielectric and is used as the dielectric of a load capacitance capacitor. Nevertheless, a small piezoelectric oscillator can be obtained. However, with this piezoelectric oscillator,
Electrodes are also formed on the side surface and the lower surface of the base substrate of the package, and the surface exposed to the outside of the package also functions as a capacitor. Therefore, it becomes difficult to adjust the capacitance, and it is necessary to form a special electrode pattern as a countermeasure against that. However, there is a problem in that it is easily affected, capacitance is easily changed, and reliability is poor.
【０００５】この発明は、上記問題点に着目してなされ
たものであって、コンデンサの容量調整が可能で、かつ
外的要因による容量変動の少ない、信頼性に優れた負荷
容量内蔵型の圧電発振子を提供することを目的としてい
る。The present invention has been made in view of the above problems, and it is possible to adjust the capacitance of a capacitor and to reduce the capacitance variation due to an external factor, and to provide a highly reliable piezoelectric capacitor having a built-in load capacitance. The purpose is to provide a resonator.
【０００６】[0006]
【課題を解決するための手段及び作用】この発明の圧電
発振子は、圧電素子と、この圧電素子を積載し、導電性
部材で圧電素子を電気的に接続するベース基板と、前記
圧電素子を覆うキャップとからなり、前記ベース基板に
誘電体を用いるとともに、このベース基板の表面に前記
圧電素子を接続する第１、第２の電極を形成し、かつこ
れら第１及び第２の電極とでコンデンサを構成するため
の第３の電極を形成する圧電発振子において、前記第１
と第３の電極間と、及びもしくは第２と第３の電極間
の、前記誘電体で形成されるベース基板の外表面にガラ
スコート層を形成している。A piezoelectric oscillator according to the present invention comprises a piezoelectric element, a base substrate on which the piezoelectric element is mounted and which electrically connects the piezoelectric element with a conductive member, and the piezoelectric element. A cap is used to cover the base substrate, a dielectric is used for the base substrate, first and second electrodes for connecting the piezoelectric element are formed on the surface of the base substrate, and the first and second electrodes are formed. In the piezoelectric oscillator forming a third electrode for forming a capacitor, the first
A glass coat layer is formed on the outer surface of the base substrate formed of the dielectric material between the third electrode and the third electrode, and / or between the second electrode and the third electrode.
【０００７】この圧電発振子では、コンデンサを構成す
る第１と第３の電極間、第２と第３の電極間の誘電体
は、ベース基板の上面を除いて、外表面つまり側面及び
下面がガラスコートされているので、側面及び下面は、
コンデンサ機能に寄与しない。そのため、コンデンサ容
量の調整は、上面の電極間距離を変化させることによ
り、容易となる。また、外部の湿度、汚れ等によって、
容量変動が生じることがない。In this piezoelectric oscillator, the dielectrics between the first and third electrodes and between the second and third electrodes that form the capacitor have the outer surface, that is, the side surface and the lower surface except the upper surface of the base substrate. Since it is glass coated, the side and bottom surfaces are
Does not contribute to the capacitor function. Therefore, the capacitance of the capacitor can be easily adjusted by changing the distance between the electrodes on the upper surface. Also, due to external humidity, dirt, etc.
Capacity fluctuation does not occur.
【０００８】[0008]
【実施例】以下、実施例により、この発明をさらに詳細
に説明する。図１ないし図５は、この発明の一実施例圧
電セラミック発振子を示し、図１は上部ケース（キャッ
プ）を除いた部分の上面図、図２はその側面図、図３は
底面図、図４は図１のＡ−Ａ断面図、図５は図１のベー
ス基板のＢ−Ｂ断面図である。The present invention will be described in more detail with reference to the following examples. 1 to 5 show a piezoelectric ceramic oscillator according to an embodiment of the present invention, FIG. 1 is a top view of a portion excluding an upper case (cap), FIG. 2 is a side view thereof, FIG. 3 is a bottom view, and FIG. 4 is a sectional view taken along line AA of FIG. 1, and FIG. 5 is a sectional view taken along line BB of the base substrate shown in FIG.
【０００９】この実施例セラミック発振子１１は、ベー
ス基板１２の表面に、互いに所定の間隔を置いて、３つ
の電極１３、１４、１５が形成され、ベース基板１２上
に圧電セラミック素子１６が積載され、圧電セラミック
素子１６の両電極が、ベース基板１２の両端の電極１
３、１４に導電接着剤１７によって電気的に接続されて
いる。ベース基板１２の材料として、誘電体セラミック
が使用される。したがって、ベース基板１２の電極１３
と、電極１５と、その間の誘電体セラミックでコンデン
サＣ1 が、また電極１４と、電極１５と、その間の誘電
体セラミックでコンデンサＣ2 が形成される。もっとも
以上のセラミック発振子１１の基本構成は、図７、図８
に示したものと変わるところはない。In the ceramic oscillator 11 of this embodiment, three electrodes 13, 14 and 15 are formed on a surface of a base substrate 12 at predetermined intervals, and a piezoelectric ceramic element 16 is mounted on the base substrate 12. Both electrodes of the piezoelectric ceramic element 16 are connected to the electrodes 1 at both ends of the base substrate 12.
3 and 14 are electrically connected by a conductive adhesive 17. A dielectric ceramic is used as the material of the base substrate 12. Therefore, the electrode 13 of the base substrate 12
Then, the electrode 15 and the dielectric ceramic between them form the capacitor C 1 , and the electrode 14, the electrode 15 and the dielectric ceramic between them form the capacitor C 2 . The basic configuration of the above ceramic oscillator 11 is shown in FIGS.
There is no difference from the one shown in.
【００１０】この実施例セラミック発振子１１の特徴
は、ベース基板１２の電極１３と電極１５間及び電極１
３、１５の下地に亘る表面に、また同じく、電極１４と
電極１５間及び電極１４、１５の下地に亘る表面に、ベ
ース基板１２の上面部分を除いて、ガラスコート層１８
を形成し、このガラスコート層１８の端縁を電極の一部
が覆う態様で、電極１３、１４、１５を形成したことで
ある。The ceramic oscillator 11 of this embodiment is characterized in that it is located between the electrodes 13 and 15 of the base substrate 12 and between the electrodes 1.
The glass coating layer 18 except for the upper surface portion of the base substrate 12 is formed on the surface of the base substrate 12 between the electrodes 14 and 15 and on the surface of the electrodes 14 and 15 extending over the base.
Is formed, and the electrodes 13, 14, 15 are formed in such a manner that the edges of the glass coat layer 18 are partially covered with the electrodes.
【００１１】ガラスコート層１８は、上記したようにベ
ース基板１２の下面、及び側面（図５の１８ａ、１８
ｂ、１８ｃ）に形成されているが、ベース基板１２の上
面には形成されていない。したがって、電極１３と電極
１５、電極１４と電極１５間で、それぞれコンデンサと
して寄与するのは、ベース基板１２の上面、つまりキャ
ップによって覆われる部分のみである。それゆえ、外面
が汚れても、また外部湿度が変動しても、コンデンサ容
量に影響を与えることは少ない。また、ベース基板１２
の表面の電極のパターンの部分的な追加除去を行うこと
で、簡単に製造時の静電容量を所定値とすることができ
る。The glass coat layer 18 is formed on the lower surface and the side surfaces (18a, 18 in FIG. 5) of the base substrate 12 as described above.
b, 18c), but not on the upper surface of the base substrate 12. Therefore, between the electrodes 13 and 15, and between the electrodes 14 and 15, only the upper surface of the base substrate 12, that is, the portion covered by the cap, contributes as a capacitor. Therefore, even if the outer surface is dirty or the external humidity fluctuates, the capacity of the capacitor is not affected. In addition, the base substrate 12
By partially removing the electrode pattern on the surface of, the capacitance at the time of manufacture can be easily made to be a predetermined value.
【００１２】ガラスコート層１８の形成は、ガラスペー
スト印刷、焼成による厚膜形成、あるいはスパッタによ
る薄膜形成等によって行う。The glass coat layer 18 is formed by printing a glass paste, forming a thick film by firing, or forming a thin film by sputtering.
【００１３】[0013]
【発明の効果】この発明によれば、コンデンサ内蔵によ
る発振回路の簡素化、誘電体ベース基板をコンデンサの
誘電体として用いることによる薄型化を実現し得るとと
もに、ベース基板の、電極間の下面及びもしくは側面に
ガラスコート層を形成し、コンデンサ機能に寄与する誘
電体はベース基板の上面のみとしたので、ベース基板の
外面が汚れたり、外表面の湿度が変化しても何ら、コン
デンサの容量変動を受けることがない。またベース基板
の上面の電極パターンのみで、製造時の容量調整を行う
ことができ、所定値とできるので、容量精度を向上させ
得る。According to the present invention, it is possible to simplify an oscillation circuit by incorporating a capacitor and to reduce the thickness by using a dielectric base substrate as a dielectric of a capacitor. Alternatively, a glass coat layer is formed on the side surface and the dielectric that contributes to the capacitor function is only the upper surface of the base substrate, so even if the outer surface of the base substrate becomes dirty or the humidity on the outer surface changes, the capacitance of the capacitor will not change. Never receive. In addition, the capacitance can be adjusted at the time of manufacturing by using only the electrode pattern on the upper surface of the base substrate, and the predetermined value can be set, so that the capacitance accuracy can be improved.
【図１】この発明の一実施例を示すセラミック発振子の
上面図である。FIG. 1 is a top view of a ceramic oscillator showing an embodiment of the present invention.
【図２】同実施例セラミック発振子の側面図である。FIG. 2 is a side view of the ceramic oscillator according to the embodiment.
【図３】同実施例セラミック発振子の下面図である。FIG. 3 is a bottom view of the ceramic oscillator according to the embodiment.
【図４】図１のＡ−Ａで切断した断面図である。FIG. 4 is a cross-sectional view taken along the line AA of FIG.
【図５】図１のＢ−Ｂで切断したベース基板の断面図で
ある。5 is a cross-sectional view of the base substrate taken along line BB in FIG.
【図６】セラミック発振子の等価回路を示す回路図であ
る。FIG. 6 is a circuit diagram showing an equivalent circuit of a ceramic oscillator.
【図７】先願に係るセラミック発振子の上面図である。FIG. 7 is a top view of a ceramic oscillator according to a prior application.
【図８】同先願に係るセラミック発振子の側面図であ
る。FIG. 8 is a side view of the ceramic oscillator according to the earlier application.
１２ ベース基板 １５ 電極 １８ ガラスコート層 12 base substrate 15 electrode 18 glass coat layer
Claims (1)
性部材で圧電素子を電気的に接続するベース基板と、前
記圧電素子を覆うキャップとからなり、前記ベース基板
に誘電体を用いるとともに、このベース基板の表面に前
記圧電素子を接続する第１、第２の電極を形成し、かつ
これら第１及び第２の電極とでコンデンサを構成するた
めの第３の電極を形成する圧電発振子において、 前記第１と第３の電極間と、及びもしくは第２と第３の
電極間の、前記誘電体で形成されるベース基板の外表面
にガラスコート層を形成したことを特徴とする圧電発振
子。1. A piezoelectric element, a base substrate on which the piezoelectric element is mounted and which electrically connects the piezoelectric element with a conductive member, and a cap which covers the piezoelectric element. A dielectric is used for the base substrate. At the same time, a piezoelectric forming first and second electrodes for connecting the piezoelectric element on the surface of the base substrate, and forming a third electrode for forming a capacitor with the first and second electrodes. In the resonator, a glass coat layer is formed on the outer surface of the base substrate formed of the dielectric between the first and third electrodes and / or between the second and third electrodes. Piezoelectric oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4282696A JPH06140864A (en) | 1992-10-21 | 1992-10-21 | Piezoelectric oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4282696A JPH06140864A (en) | 1992-10-21 | 1992-10-21 | Piezoelectric oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH06140864A true JPH06140864A (en) | 1994-05-20 |
Family
ID=17655870
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4282696A Pending JPH06140864A (en) | 1992-10-21 | 1992-10-21 | Piezoelectric oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH06140864A (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028026B2 (en) * | 1981-06-02 | 1990-02-22 | Fuukaa Chem Ando Purasuteitsukusu Corp | |
| JP3090123B2 (en) * | 1998-06-22 | 2000-09-18 | ヤマハ株式会社 | Waveform generation method |
-
1992
- 1992-10-21 JP JP4282696A patent/JPH06140864A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH028026B2 (en) * | 1981-06-02 | 1990-02-22 | Fuukaa Chem Ando Purasuteitsukusu Corp | |
| JP3090123B2 (en) * | 1998-06-22 | 2000-09-18 | ヤマハ株式会社 | Waveform generation method |
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