JP4938369B2 - Crystal oscillator - Google Patents

Crystal oscillator Download PDF

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JP4938369B2
JP4938369B2 JP2006182555A JP2006182555A JP4938369B2 JP 4938369 B2 JP4938369 B2 JP 4938369B2 JP 2006182555 A JP2006182555 A JP 2006182555A JP 2006182555 A JP2006182555 A JP 2006182555A JP 4938369 B2 JP4938369 B2 JP 4938369B2
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crystal
vibrating piece
mounting
crystal resonator
resonator element
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JP2008011469A (en
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晃基 本田
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Kyocera Crystal Device Corp
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Description

本発明は、表面実装可能な水晶振動子の水晶振動片の実装姿態のズレを低減することで、実装時の容量成分などの影響を軽減することで振動特性を維持向上した容器構造を用いた水晶振動片の実装に関するものである。   The present invention uses a container structure that maintains and improves the vibration characteristics by reducing the displacement of the mounting state of the crystal vibrating piece of the surface-mountable crystal resonator, thereby reducing the influence of the capacitive component during mounting. The present invention relates to mounting of a crystal resonator element.

昨今のデジタル家電、携帯用端末、あるいは通信機器、自動車の電子制御関連と幅広く圧電(水晶)振動子が活躍している。水晶振動子の中でも代表とする材料の水晶材料が水晶振動子として広く利用されているのが現状である。また、水晶振動子の中でも最も広く使われている仕様には、低温から高温にかけて3次曲線の温度特性を持つ一般的な水晶のカットアングルがATカットの水晶基板を用いたものが主流である。   Piezoelectric (crystal) resonators are widely used in recent digital home appliances, portable terminals, communication devices, and electronic control related to automobiles. The present condition is that a crystal material, which is a representative material among crystal resonators, is widely used as a crystal resonator. In addition, the most widely used specifications for quartz resonators are those that use an AT-cut quartz substrate with a general crystal cut angle that has a temperature characteristic of a cubic curve from low to high temperatures. .

また、昨今では水晶振動子の外形寸法が極小型化、薄型化することで一例としては水晶振動子の外形寸法が3.2mm×2.5mm、2.5mm×2.0mm、2.0mm×1.6mmと小型化しており、これらの外形寸法に収納する水晶振動片の外形寸法は、縦×横1mm台の寸法により構成されたものが使われている。このように水晶振動子の外形寸法は搭載する電子機器、家電製品の小型化に追従したものであるが、その一方で水晶振動子の製造や、水晶振動子の核となる水晶振動片の小型化技術についても、日々改善と工夫が重ねられている。   In addition, in recent years, the external dimensions of crystal resonators are extremely small and thin, and as an example, the external dimensions of crystal resonators are 3.2 mm × 2.5 mm, 2.5 mm × 2.0 mm, 2.0 mm × The size of the crystal vibrating piece housed in these outer dimensions is 1.6 mm, and the outer dimensions of the quartz crystal vibrating piece accommodated in the dimensions of vertical × horizontal 1 mm are used. In this way, the external dimensions of the crystal unit follow the miniaturization of electronic devices and household appliances to be mounted. On the other hand, the crystal unit is manufactured and the crystal unit that is the core of the crystal unit is small. Improvements and ingenuity are also being made on a daily basis.

上述するように水晶振動子の小型化に伴い、水晶振動片を収納する(水晶振動子の)容器については、従来のUM(ウルトラミニ)タイプやSMD(表面実装デバイス)タイプを継承しつつ、更に小型化した形状や材料を用いたものが開発されているのが現状である。   As described above, with the miniaturization of the crystal unit, the container (of the crystal unit) that stores the crystal unit is inherited from the conventional UM (Ultra Mini) type and SMD (Surface Mount Device) type, In addition, there are currently developed products using smaller shapes and materials.

ところで、水晶振動子の核となる水晶振動片とは、水晶ブランク則ち、人工水晶から所望の切断角(カットアングル)で切り出した水晶板を、所望の出力周波数を得るまで厚み研磨を行い水晶板を薄く加工し、所望の厚みになった水晶板(水晶ブランク)に電極金属を付着させ、この電極金属から電荷を印加することにより安定した一定周期の出力周波数を得ることができる。要するに電極金属を付着した状態の水晶板を総称して水晶振動片と呼んでいる。   By the way, the crystal resonator element that is the core of the crystal unit is a crystal blank, that is, a crystal plate cut out from an artificial crystal with a desired cutting angle (cut angle), and then polished to obtain a desired output frequency. By processing the plate thinly, attaching an electrode metal to a quartz plate (quartz blank) having a desired thickness, and applying an electric charge from the electrode metal, a stable output frequency with a constant period can be obtained. In short, the crystal plate with the electrode metal attached is generically called a crystal resonator element.

一例として、表面実装型の矩形状の水晶振動子の形状は、特許文献1、特許文献2に示すように、密閉容器構造の中に上述する水晶振動片を実装した構成で、水晶振動片を容器に収納することで水晶振動子の形態となる。また、水晶振動子に半導体部品を組み込むことで水晶発振器を得ることで、水晶振動子同様、水晶発振器も昨今では広い分野で多用されている。   As an example, as shown in Patent Document 1 and Patent Document 2, the surface-mounted rectangular crystal resonator has a structure in which the above-described crystal resonator element is mounted in a sealed container structure. When stored in a container, a crystal resonator is formed. Further, by obtaining a crystal oscillator by incorporating a semiconductor component into a crystal resonator, crystal oscillators are now widely used in a wide range of fields as well as crystal resonators.

上記のように、一般的に特許文献1に示すような水晶振動子をユーザ基板に実装するための電極端子を介して導通と接続が行われているが、水晶振動子を製造するにあたり、組立機により水晶振動片をでパッケージ(容器)内に収納、実装するが水晶振動片の引出し電極は容器の搭載パッド箇所を認識して実装することから、搭載後は外観基準を設けてその基準に沿って検査が行われている。この場合、容器全体のイメージを基準にして水晶振動片の実装位置を認識し、その基準に施す材料としては、パッケージ内の電極形成材料の金メッキ処理などで行っている。
特開2004−312057号公報 なお、出願人は前記した先行技術文献情報で特定される先行技術文献以外には、本発明に関連する先行技術文献を、本件出願時までに発見するに至らなかった。
As described above, conduction and connection are generally performed through electrode terminals for mounting a crystal resonator as shown in Patent Document 1 on a user board. The quartz vibrating piece is housed and mounted in a package (container) by the machine, but the extraction electrode of the quartz vibrating piece is mounted by recognizing the mounting pad location of the container. Inspection is being conducted along. In this case, the mounting position of the quartz crystal resonator element is recognized based on the image of the entire container, and the material applied to the reference is performed by gold plating of the electrode forming material in the package.
JP, 2004-312057, A In addition to the prior art documents specified by the prior art document information described above, the applicant has not found prior art documents related to the present invention by the time of filing of the present application. .

上述する従来技術に示す水晶振動子は、昨今水晶振動子の外形寸法が更に小型化することにより、従来では予想もつかない精密な水晶振動片の実装形態が求められているのが見えてきた。例えば、水晶振動子の外形寸法の小型化に伴う水晶振動片も小型化し更に、水晶振動片に形成する励振電極の形状や水晶振動片の振動領域に対する励振電極の面積比などがある。   The crystal resonator shown in the above-described prior art has recently been required to have a precise crystal resonator piece mounting form that is not expected in the past due to further downsizing of the external dimensions of the crystal resonator. For example, the quartz crystal resonator element is also miniaturized as the external dimensions of the crystal resonator are miniaturized. Further, there are the shape of the excitation electrode formed on the quartz resonator element, the area ratio of the excitation electrode to the vibration region of the quartz resonator element, and the like.

この面積比については既に以前から水晶振動子の実体特性を評価しながら、多くのシミュレーション結果から最良の面積比が求められているが、水晶振動子の小型化により更に、水晶振動片の実装位置精度も水晶振動子の発振特性に対して影響を及ぼすことが見えてきた。その具体的な例では、水晶振動子の容器に水晶振動片を収納するのに対して、水晶振動片のX軸方向、Z軸方向のθ回転や、実装位置のズレである。   With regard to this area ratio, the best area ratio has been calculated from many simulation results while evaluating the actual characteristics of the crystal unit from before. It has become apparent that accuracy also has an effect on the oscillation characteristics of crystal units. In the specific example, the quartz crystal resonator element is housed in the container of the quartz crystal resonator, whereas the rotation of the quartz crystal resonator element in the X-axis direction and the Z-axis direction and the mounting position shift.

上述の内容は、全体的な水晶振動子の小型化が水晶振動片の小型化につながり、些細な実装のズレも水晶振動子の発振特性を大きく左右させてしまうもので、その最も大きな要因のひとつには、実装位置やθズレによる水晶振動子の容量成分の変化ではないかとの指摘がある。   In the above description, the overall size reduction of the crystal unit leads to the size reduction of the crystal unit, and even minor mounting deviations greatly affect the oscillation characteristics of the crystal unit. For one thing, it is pointed out that the capacitance component of the crystal unit may change due to the mounting position or θ deviation.

そのため、機械化された自動実装の製造工程でありながら、水晶振動子の品質確認の一工程では、人員による良否判定を行ったり、画像認識による良否評価を行うが、従来の製品では水晶振動子の容器に対する水晶振動片の実装位置認識が分かりにくいと言った課題が生じている。またその一方で従来の水晶振動子容器は、水晶振動片の実装位置認識表示を付ける場合でも、容器を製造する工程を簡略化する関係で、水晶振動片の実装箇所に用いる金材料で形成することもあることから、水晶振動子全体のコストアップになるなどの課題がある。   Therefore, while it is a mechanized automatic mounting manufacturing process, in one step of quality confirmation of the crystal resonator, the quality is judged by personnel and the quality is evaluated by image recognition. There is a problem that it is difficult to recognize the mounting position of the quartz crystal resonator element with respect to the container. On the other hand, the conventional crystal resonator container is formed of a gold material used for mounting the crystal resonator element in order to simplify the process of manufacturing the container even when the crystal resonator element mounting position recognition display is provided. In some cases, there are problems such as an increase in the cost of the entire crystal unit.

そこで上述する課題を解決するために本発明は、ベースと蓋体とにより密閉構造を構成する水晶振動子における、矩形状の水晶振動片を、前記ベース内の矩形状の底面における一方の短辺に沿って設けられた2つの実装部に、前記水晶振動片の長辺方向の一方端に設けられた引き出し電極を固着することで実装する方法であって、アルミナから成る位置認識表示を、前記実装部に所望する姿勢で前記水晶振動片を実装した際に前記水晶振動片の長辺方向の一方端の短辺が対向する前記実装部の中間の前記底面上に、前記位置認識表示の矩形の主面の一方の長辺が前記水晶振動片の長辺方向の一方端の短辺と重り、且つ前記位置認識表示全体が前記水晶振動片の下に位置する形態で設け、前記水晶振動片を、前記水晶振動片の長辺方向の一方端の短辺が前記位置認識表示の主面の一方の長辺に重なる姿勢で前記実装部上に配置し、前記実装部と前記引き出し電極とを固着することで前記水晶振動片を実装する水晶振動片の実装方法である。 Accordingly, in order to solve the above-described problem, the present invention provides a rectangular crystal vibrating piece in a quartz resonator that forms a sealed structure with a base and a lid, and one short side of the rectangular bottom surface in the base. Are mounted by attaching an extraction electrode provided at one end in the long side direction of the quartz crystal vibrating piece to two mounting portions provided along the position, wherein the position recognition display made of alumina is When the crystal vibrating piece is mounted in a desired posture on the mounting portion, the position recognition display rectangle is placed on the bottom surface in the middle of the mounting portion where the short side of one end in the long side direction of the crystal vibrating piece faces. One long side of the main surface of the quartz crystal resonator element overlaps with a short side of one end in a long side direction of the crystal resonator element, and the entire position recognition display is provided below the crystal resonator element. , One end of the crystal vibrating piece in the long side direction Short side placed on the mounting portion on a position overlapping the one long side of the main surface of the position recognition display, quartz crystal resonator element mounting the quartz crystal resonator element by fixing the said extraction electrode and the mounting portion This is the implementation method.

要するに本発明は、水晶振動子を構成する水晶振動片の電極金属から伸びる引き出し電極をベースのパターンに実装する際、ベースの実装電極パターン位置に精度良く実装されているか否かを簡単に識別できるような認識表示を行うもので、水晶振動子の容器に対して水晶振動片が常に安定して実装されることにより、水晶振動片全体に対する周辺部からの容量変動を受けにくくなりその結果安定した発振特性を得ることができる。   In short, according to the present invention, when the extraction electrode extending from the electrode metal of the crystal resonator element constituting the crystal resonator is mounted on the base pattern, it can be easily identified whether or not it is accurately mounted at the position of the base mounting electrode pattern. The crystal resonator element is always stably mounted on the crystal unit container, and is less susceptible to capacitance fluctuations from the periphery of the entire crystal resonator element. Oscillation characteristics can be obtained.

また、上記の水晶振動片の実装位置を認識する上で、従来では金材料により認識表示をしていたが、今回安価なアルミナ材料を用いることで、認識処理コストを低減することにより全体的な水晶振動子のコストを低減することができる。以上のことから、水晶振動片の安定した実装位置認識を実現し認識表示コストを抑えた水晶振動子を得ることにより課題を解決するものである。   Also, in the past, when the mounting position of the above-mentioned crystal vibrating piece was recognized, the recognition display was made with a gold material. However, by using an inexpensive alumina material this time, the recognition processing cost is reduced and the overall operation is reduced. The cost of the crystal unit can be reduced. From the above, the problem is solved by obtaining a crystal resonator that realizes stable mounting position recognition of the crystal resonator element and suppresses the recognition display cost.

本発明によれば、容量変動要素を改善しべく、水晶振動片を実装する際の位置認識を簡略し、更には認識表示のコストを低減することで、水晶振動子の製品コストを低減することができる。その結果、人員による良否検査を行う場合でも、個人差が無くなり水晶振動片の搭載バラツキも減少させることができ、製造工程も改善されることで、水晶振動子の発振特性組立も安定し製造工程における製造歩留まりが向上し、製造コストを安価にすることができる。   According to the present invention, in order to improve the capacity variation factor, the position recognition when mounting the crystal resonator element is simplified, and further the cost of the crystal display is reduced by reducing the cost of the recognition display. Can do. As a result, even when performing pass / fail inspections by personnel, there is no individual difference and the variation in mounting of the crystal resonator element can be reduced, and the manufacturing process is improved, so that the assembly of the oscillation characteristics of the crystal resonator is stabilized and the manufacturing process The production yield in the process can be improved, and the production cost can be reduced.

以下、添付図面に従ってこの発明の実施例を説明する。なお、各図において同一の符号は同様の対象を示すものとする。図1に示すのは本発明の水晶振動子4の概念斜視図で、水晶振動子4のベース(容器)1に水晶振動片3を実装する場合の状態を示したものである。従来では水晶振動片3をベース(容器)1に収納し水晶振動片3の励振電極から延びる引き出し電極を電気的に固着と導通を行う際に、所定の実装位置に対して、X軸方向、Z軸方向あるいは、θの位置ズレの発生があったが、本発明により上記の位置ズレを解消することができる。ここで、容器材料については、セラミックやガラスをはじめとする絶縁材料が用いられるが、材料に制約を受けるものではない。   Embodiments of the present invention will be described below with reference to the accompanying drawings. In each figure, the same numerals indicate the same objects. FIG. 1 is a conceptual perspective view of a crystal resonator 4 according to the present invention, and shows a state where the crystal resonator element 3 is mounted on a base (container) 1 of the crystal resonator 4. Conventionally, when the crystal vibrating piece 3 is housed in the base (container) 1 and the extraction electrode extending from the excitation electrode of the crystal vibrating piece 3 is electrically fixed and conducted, the X axis direction with respect to a predetermined mounting position, Although the positional deviation of the Z-axis direction or θ has occurred, the above positional deviation can be eliminated by the present invention. Here, as the container material, an insulating material such as ceramic or glass is used, but the material is not limited.

一方図2に示すのは、本発明の特徴であるベース(容器)1に対して、水晶振動片3の実装位置関係を示したものである。本発明は、ベース1と蓋体2とにより密閉構造を構成する矩形状の圧電振動片3を収納した水晶振動子4において、前記ベース1の前記圧電振動片3を実装する面の前記圧電振動片3の固着部間に、アルミナ材料で前記圧電振動片3の位置認識表示5が形成され、前記振動片3の端面と前記位置認識表示5を用いて位置合わせした格好で実装されていることから、ベース(容器)1に形成する水晶振動板から伸びる引き出し電極位置に対して、ベース(容器)1の実装位置にアルミナ材質の認識表示5を形成するものである。   On the other hand, FIG. 2 shows the mounting positional relationship of the crystal vibrating piece 3 with respect to the base (container) 1 which is a feature of the present invention. The present invention relates to a crystal resonator 4 in which a rectangular piezoelectric vibrating piece 3 constituting a sealed structure is formed by a base 1 and a lid 2, and the piezoelectric vibration of a surface of the base 1 on which the piezoelectric vibrating piece 3 is mounted. The position recognition display 5 of the piezoelectric vibrating piece 3 is formed of an alumina material between the fixing portions of the pieces 3 and is mounted in a position aligned with the end face of the vibrating piece 3 and the position recognition display 5. Thus, the alumina material recognition display 5 is formed at the mounting position of the base (container) 1 with respect to the lead electrode position extending from the crystal diaphragm formed on the base (container) 1.

位置認識表示5を形成する場所が水晶振動片3の引き出し電極位置周辺であることから、ベース(容器)1の比較的見やすい場所であることから、ベース(容器)1の所定の実装位置を認識し易く、また位置認識表示5を用いて位置合わせするように水晶振動片3を配置することから、実装後の認識が非常に分かりやすくなり、水晶振動片3の実装状態を簡単に判断することができるようになる。   Since the place where the position recognition display 5 is formed is around the position of the extraction electrode of the crystal vibrating piece 3, the base (container) 1 is relatively easy to see, so that a predetermined mounting position of the base (container) 1 is recognized. Since the crystal vibrating piece 3 is arranged so as to be aligned using the position recognition display 5, the recognition after mounting becomes very easy to understand, and the mounting state of the crystal vibrating piece 3 can be easily determined. Will be able to.

図3は、ベース(容器)1に形成する位置認識表示5に着目したものであるが、上述の通りベース1に対して水晶振動片3の引き出し電極のほぼ中間位置に表示がなされることで、容器対して水晶振動片3を実装する前後の状態も分かりやすく、また実装後は水晶振動片3の一端面と表示部とを用いて位置合わせした格好となることから、位置認識がわかり易くもなる。なお、水晶振動片3との位置認識関係から、位置認識表示5の形状は、角状や短い線状が望ましい。   FIG. 3 focuses on the position recognition display 5 formed on the base (container) 1. As described above, the display is made approximately at the intermediate position of the extraction electrode of the crystal vibrating piece 3 with respect to the base 1. The state before and after mounting the crystal vibrating piece 3 on the container is easy to understand, and after mounting, the position is aligned using one end face of the crystal vibrating piece 3 and the display part, so that the position recognition is easy to understand. Become. From the position recognition relationship with the crystal vibrating piece 3, the shape of the position recognition display 5 is preferably a square shape or a short line shape.

本発明の概念を示す図である。It is a figure which shows the concept of this invention. 本発明の水晶振動子の実装状態を示す概念図である。It is a conceptual diagram which shows the mounting state of the crystal oscillator of this invention. 本発明の位置認識表示に注目した平面図である。It is a top view which paid its attention to the position recognition display of this invention.

符号の説明Explanation of symbols

1 ベース
2 蓋体
3 圧電(水晶)振動片
4 水晶振動子
5 位置認識表示
1 Base 2 Lid 3 Piezoelectric (Crystal) Vibrating Piece 4 Crystal Resonator 5 Position Recognition Display

Claims (1)

ベースと蓋体とにより密閉構造を構成する水晶振動子における、矩形状の水晶振動片を、前記ベース内の矩形状の底面における一方の短辺に沿って設けられた2つの実装部に、前記水晶振動片の長辺方向の一方端に設けられた引き出し電極を固着することで実装する方法であって、
アルミナから成る位置認識表示を、前記実装部に所望する姿勢で前記水晶振動片を実装した際に前記水晶振動片の長辺方向の一方端の短辺が対向する前記実装部の中間の前記底面上に、前記位置認識表示の矩形の主面の一方の長辺が前記水晶振動片の長辺方向の一方端の短辺と重り、且つ前記位置認識表示全体が前記水晶振動片の下に位置する形態で設け、
前記水晶振動片を、前記水晶振動片の長辺方向の一方端の短辺が前記位置認識表示の主面の一方の長辺に重なる姿勢で前記実装部上に配置し、前記実装部と前記引き出し電極とを固着することで前記水晶振動片を実装する
ことを特徴とする水晶振動片の実装方法。
In a quartz crystal resonator that forms a sealed structure with a base and a lid , a rectangular crystal resonator element is attached to two mounting portions provided along one short side of the rectangular bottom surface in the base. It is a method of mounting by fixing the extraction electrode provided at one end in the long side direction of the crystal vibrating piece,
When the crystal vibrating piece is mounted on the mounting portion in a desired posture, the bottom surface in the middle of the mounting portion is opposed to the short side of one end in the long side direction of the crystal vibrating piece. Further, one long side of the rectangular main surface of the position recognition display overlaps with a short side of one end in the long side direction of the crystal vibrating piece, and the entire position recognition display is positioned below the crystal vibrating piece. Provided in a form to
The quartz crystal resonator element is disposed on the mounting unit in a posture in which a short side of one end in a long side direction of the crystal resonator element overlaps one long side of the main surface of the position recognition display, and the mounting unit and the A method of mounting a quartz crystal vibrating piece, wherein the quartz crystal vibrating piece is mounted by fixing the lead electrode .
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