JP2007057382A - Pressure sensor element - Google Patents

Pressure sensor element Download PDF

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JP2007057382A
JP2007057382A JP2005243266A JP2005243266A JP2007057382A JP 2007057382 A JP2007057382 A JP 2007057382A JP 2005243266 A JP2005243266 A JP 2005243266A JP 2005243266 A JP2005243266 A JP 2005243266A JP 2007057382 A JP2007057382 A JP 2007057382A
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axis
crystal
degrees
pressure sensor
azimuth angle
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Hiroaki Iida
浩章 飯田
Hideo Outsuka
日出夫 鶯塚
Kotaro Wakabayashi
小太郎 若林
Atsuya Takahashi
敦哉 高橋
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Kyocera Crystal Device Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a pressure sensor element having extremely stable characteristics by preventing generation of a twin crystal in a crystal constituting the element in any environment. <P>SOLUTION: This pressure sensor element formed from a rectangular quartz plate having each direction of the X'-axis, the Y"-axis and the Z'-axis as each side component, wherein an azimuth angle formed by the X-axis and the X'-axis determined by rotating the X-axis counterclockwise based on the Z-axis is ϕ, and an azimuth angle formed by the Y"-axis and the Z-axis determined by rotating the Z-axis as much as the angle α counterclockwise based on the X'-axis is θ, in each crystal axis of a quartz crystallite, is characterized by being formed from the quartz plate cut out with the azimuth angle ϕ and the azimuth angle θ wherein a Gibbs free energy difference ΔG becomes zero or positive. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、圧力センサ素子に関し、特に高温高圧化においても特性が良好な圧力センサ素子に関する。   The present invention relates to a pressure sensor element, and more particularly to a pressure sensor element having good characteristics even at high temperatures and pressures.

従来から、圧電素子に水晶を用いた圧力センサ素子が知られている(例えば、特許文献1参照)。このような圧力センサ素子は、その素子表面(以下、「主面」という。)に圧力がかかると歪みが生じ、その歪みによって生じる電荷を検出することによって圧力を測定している。   Conventionally, a pressure sensor element using a crystal as a piezoelectric element is known (for example, refer to Patent Document 1). Such a pressure sensor element is distorted when pressure is applied to the element surface (hereinafter referred to as “main surface”), and the pressure is measured by detecting an electric charge generated by the distortion.

ここで、圧力センサ素子は、人工水晶又は天然水晶から切り出され、例えば、いわゆるATカットやXカットと呼ばれるカットアングルで切り出された水晶素板から形成されている。更に、圧力センサ素子に用いられるような短円柱状の水晶材等の表裏円状の主面上には、通常この水晶材を励振させたり、或いは振動している圧電材より信号を取り出たしたりするため電極膜が形成されており、この電極膜はワイヤボンディングや導電性接合材等で外部の電子回路網に電気的に接続されている。又、水晶からなる圧電素子を用いた圧力センサ素子を用いた場合、所定の温度環境下で、所定の圧力をかけた場合に素子結晶中に双晶が生じることが知られている(例えば、特許文献2参照)。   Here, the pressure sensor element is formed from a quartz base plate cut out from an artificial quartz crystal or a natural quartz crystal and cut out at a cut angle called a so-called AT cut or X cut. Further, on the front and back circular main surfaces of a short cylindrical crystal material or the like used for a pressure sensor element, the crystal material is usually excited or a signal is extracted from a vibrating piezoelectric material. For this reason, an electrode film is formed, and this electrode film is electrically connected to an external electronic network by wire bonding, a conductive bonding material or the like. In addition, when a pressure sensor element using a piezoelectric element made of quartz is used, it is known that twin crystals are generated in the element crystal when a predetermined pressure is applied in a predetermined temperature environment (for example, Patent Document 2).

尚、このような圧力センサ素子については、以下のような先行技術文献が公知となっている。   In addition, the following prior art documents are well-known about such a pressure sensor element.

特開2004−85237号公報JP 2004-85237 A 特公平7−69273号公報(段落0002〜段落0006)Japanese Examined Patent Publication No. 7-69273 (paragraphs 0002 to 0006)

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。   The applicant has not found any prior art documents related to the present invention other than the prior art documents specified by the prior art document information described above by the time of filing of the present application.

しかし、圧力センサ素子を構成する水晶結晶内に双晶が生じた場合、そのような結晶により構成されている圧力センサ素子では、圧力センサ素子としての圧力感度,振動特性及び周波数温度特性等の諸特性が、双晶の生成により所望の特性値(双晶が結晶内に生じる前の特性値)から変化してしまい、センサ素子として不具合が生じる恐れがある。   However, when twin crystals are formed in the quartz crystal constituting the pressure sensor element, the pressure sensor element constituted by such a crystal has various pressure sensitivity, vibration characteristics, frequency temperature characteristics, etc. as the pressure sensor element. The characteristic changes from a desired characteristic value (characteristic value before the twin crystal is generated in the crystal) due to the generation of twins, which may cause a problem as a sensor element.

そこで、本発明では、前記した問題を解決し、あらゆる環境下においても、素子を構成する結晶内に双晶を生じなくすることにより、諸特性が極めて安定した圧力センサ素子を提供することを課題とする。   Accordingly, the present invention has an object to provide a pressure sensor element in which various characteristics are extremely stable by solving the above-described problems and eliminating twins in a crystal constituting the element even under any environment. And

上記課題を解決するために本発明は成されたものであり、水晶結晶体の各結晶軸のうち、Z軸を基軸として反時計回りにX軸が回転したX′軸とX軸とが成す方位角度がφ、このX′軸を基軸として反時計回りにZ軸が角度α回転したときのZ軸とY′′軸とが成す方位角度がθであり、X′軸,Y′′軸及びZ′軸の各方向を各辺成分とする矩形状の水晶板から形成されている圧力センサ素子において、
ギブスの自由エネルギー差ΔGの結晶方位依存性を求める次式

Figure 2007057382
でΔGが0又は正となるような方位角度φ及び方位角度θとして切り出された水晶板より形成されていることを特徴とする圧力センサ素子である。 The present invention has been made in order to solve the above-mentioned problem, and among the crystal axes of the quartz crystal body, an X′-axis and an X-axis are formed by rotating the X-axis counterclockwise about the Z-axis. The azimuth angle is φ, and the azimuth angle formed by the Z axis and the Y ″ axis when the Z axis rotates an angle α counterclockwise with the X ′ axis as the base axis is θ, and the X ′ axis and the Y ″ axis And a pressure sensor element formed from a rectangular crystal plate having each side component in each direction of the Z ′ axis,
Obtaining crystal orientation dependence of Gibbs free energy difference ΔG
Figure 2007057382
The pressure sensor element is formed of a quartz plate cut out with an azimuth angle φ and an azimuth angle θ such that ΔG becomes 0 or positive.

又、水晶結晶体の各結晶軸のうち、Z軸を基軸として反時計回りにX軸が回転したX′軸とX軸とが成す方位角度が、28度以上30度以下,90度以上92度以下又は148度以上150度以下であり、このX′軸を基軸として反時計回りにZ軸が角度α回転した時のZ軸とY′′軸とが成す方位角度が90度以上92度以下であり、回転したX′軸方向及びZ′軸方向のどちらかが長さ方向又は幅方向のうちの一辺となり、且つY′′軸方向が厚み方向となるように切り出した矩形状の水晶板から、この水晶板の厚み方向を素子の厚み方向とするように形成されていることを特徴とする圧力センサ素子である。   Further, among the crystal axes of the crystal body, the azimuth angle formed by the X ′ axis and the X axis rotated counterclockwise with the Z axis as the base axis is 28 ° or more and 30 ° or less, 90 ° or more and 92 ° Azimuth angle formed by the Z axis and the Y ″ axis when the Z axis rotates an angle α counterclockwise about the X ′ axis as a base axis is 90 degrees or more and 92 degrees. A rectangular crystal cut out so that either the rotated X′-axis direction or the Z′-axis direction is one side in the length direction or the width direction, and the Y ″ -axis direction is the thickness direction. The pressure sensor element is characterized in that it is formed from the plate so that the thickness direction of the crystal plate is the thickness direction of the element.

更に、水晶結晶体の各結晶軸のうち、Z軸を基軸として反時計回りにX軸が回転したX′軸とX軸とが成す方位角度が、30度以上32度以下,88度以上90度以下又は150度以上152度以下であり、このX′軸を基軸として反時計回りにZ軸が角度α回転した時のZ軸とY′′軸とが成す方位角度が88度以上90度以下として回転した、X′軸方向及びZ′軸方向のどちらかが、長さ方向又は幅方向のうちの一辺となり且つY′′軸方向が厚み方向となるように切り出した矩形状の水晶板から、この水晶板の厚み方向を素子の厚み方向とするように形成されていることを特徴とする圧力センサ素子である。   Further, among the crystal axes of the crystal body, the azimuth angle formed by the X ′ axis obtained by rotating the X axis counterclockwise with the Z axis as a base axis and the X axis is 30 degrees or more and 32 degrees or less, and 88 degrees or more and 90 degrees. Azimuth angle formed by the Z axis and the Y ″ axis when the Z axis rotates an angle α counterclockwise from the X ′ axis as a base axis is 88 degrees or more and 90 degrees. A rectangular crystal plate cut out so that either the X′-axis direction or the Z′-axis direction is one side in the length direction or the width direction and the Y ″ -axis direction is the thickness direction, rotated as follows: Thus, the pressure sensor element is formed so that the thickness direction of the quartz plate is the thickness direction of the element.

上記記載の本発明の圧力センサ素子によれば、上記数式によるΔGが0又は正となるような方位角度φ及びθで回転した回転結晶軸に各辺が沿った形態で水晶結晶体より切り出した矩形状の水晶板より形成された圧力センサ素子により、圧力センサ素子に所定の温度及び圧力がかかっても、素子結晶中に双晶を生じることが極めて少なく、因って諸特性が極めて安定した圧力センサ素子を提供することが可能となる効果を奏する。   According to the pressure sensor element of the present invention described above, each side is cut out from the crystal body in a form in which each side is along a rotating crystal axis rotated at an azimuth angle φ and θ such that ΔG according to the above formula is 0 or positive. Due to the pressure sensor element formed from a rectangular quartz plate, even if a predetermined temperature and pressure is applied to the pressure sensor element, twins are very rarely generated in the element crystal, and thus various characteristics are extremely stable. There is an effect that a pressure sensor element can be provided.

又、上記記載の本発明の圧力センサ素子によれば、上記数式によるΔGが0又は正となるような方位角度φ及びθのうち、特定の角度の組み合わせにおいて、圧力センサ素子の感度を比較的高くすることが可能となり、上記効果に加えて更に圧力感度が高い圧力センサ素子を提供することも可能となる効果を奏する。   Further, according to the pressure sensor element of the present invention described above, the sensitivity of the pressure sensor element is relatively reduced in a specific combination of azimuth angles φ and θ such that ΔG according to the above formula is 0 or positive. In addition to the above effects, the pressure sensor element having higher pressure sensitivity can be provided.

以下に図面を参照しながら本発明の実施形態について説明する。
図1は本発明における圧力センサ素子の外観を示した斜視図、及び素子の結晶軸方向を示す方位指標である。図2は図1に開示した圧力センサ素子を形成するための水晶板を示した斜視図、及び素子の結晶軸方向を示す方位指標である。図3は本発明における一水晶板の切り出す切断角度を説明する図である。
尚、各図において、本説明に必ずしも必要としない部品又は構造体は図示していない。又、各図を明確にするために一部部品又は構造体を誇張して図示してある。
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a perspective view showing the appearance of a pressure sensor element according to the present invention and an orientation index indicating the crystal axis direction of the element. FIG. 2 is a perspective view showing a quartz plate for forming the pressure sensor element disclosed in FIG. 1 and an orientation index indicating the crystal axis direction of the element. FIG. 3 is a view for explaining the cutting angle of one crystal plate in the present invention.
In each figure, parts or structures that are not necessarily required for the present description are not shown. In addition, some parts or structures are exaggerated for the sake of clarity.

図1に示す圧力センサ素子10において、圧力センサ素子10は外形形状が短円柱形状の水晶基体11の表裏円形状の両主面の全面に電極膜12がそれぞれ形成されている。この水晶基体11は、同図に記載の方位指標に表した結晶軸方向に示したように、表裏両主面の法線方向を、水晶結晶軸の電気軸であるX軸から後述する所定の角度で1回回転させたX′軸とし、水晶基体11の側面方向を、水晶結晶軸の機械軸であるY軸から後述する所定の角度で2回回転させたY′′軸、及び水晶結晶軸の光軸であるZ軸から角度αで1回回転させたZ′軸となるように形成されている。通常、外部からの圧力は短円柱状の表裏両主面に作用するように圧力センサを形成するので、圧力センサ素子10としては各結晶軸のうち最も圧力に対する感度が高いX(X′)軸方向に主面が形成されるようにする。   In the pressure sensor element 10 shown in FIG. 1, the pressure sensor element 10 has electrode films 12 formed on the entire surface of both main surfaces of the front and back circular shapes of a quartz substrate 11 whose outer shape is a short cylindrical shape. As shown in the crystal axis direction shown in the orientation index shown in the figure, this quartz crystal substrate 11 has a normal direction on both the front and back main surfaces, which is described later from an X axis that is an electric axis of the crystal crystal axis. An X ′ axis that is rotated once at an angle, a Y ′ axis that is rotated twice at a predetermined angle described later from a Y axis that is a mechanical axis of the crystal crystal axis, and a crystal crystal. It is formed to be a Z ′ axis that is rotated once by an angle α from the Z axis that is the optical axis of the axis. Usually, since the pressure sensor is formed so that the pressure from the outside acts on both main surfaces of the short cylindrical shape, the X (X ′) axis having the highest sensitivity to pressure among the crystal axes as the pressure sensor element 10. The main surface is formed in the direction.

この水晶基体11を形成する水晶板22の結晶軸方位を、図3を用いて説明する。水晶結晶体(図示なし)の各結晶軸のうち、光軸であるZ軸を基軸として反時計回りに電気軸であるX軸が回転したX′軸とX軸とが成す方位角度をφ、このX′軸を基軸として時計回りにZ軸が角度α回転したときのZ軸と機械軸であるY軸が2回回転したY′′軸とが成す方位角度をθとする。尚、図3に図示した水晶板は回転角度を明りょうにするために図示したものであり、実際に切り出す水晶板は図2に示したような方位形態の水晶板22である。   The crystal axis orientation of the quartz plate 22 forming the quartz substrate 11 will be described with reference to FIG. Of each crystal axis of a crystal body (not shown), the azimuth angle formed by the X ′ axis and the X axis rotated by the X axis as the electric axis counterclockwise around the Z axis as the optical axis is φ, The azimuth angle formed by the Z axis when the Z axis is rotated by an angle α clockwise with the X ′ axis as a base axis and the Y ′ axis obtained by rotating the Y axis as the mechanical axis twice is defined as θ. The crystal plate shown in FIG. 3 is shown to clarify the rotation angle, and the crystal plate actually cut out is the crystal plate 22 having the orientation as shown in FIG.

このとき、本発明の要旨である水晶基体11を構成する結晶内に双晶を生じることが極めて少ない水晶基体11を得るために、次式の

Figure 2007057382
におけるギブスの自由エネルギー差ΔGが、0又は正となるような方位角度φ及びθで回転した角度で切り出した水晶板21より水晶基体11を形成する。 At this time, in order to obtain the quartz crystal substrate 11 in which the number of twins is extremely small in the crystal constituting the quartz crystal substrate 11 which is the gist of the present invention,
Figure 2007057382
The quartz substrate 11 is formed from the quartz plate 21 cut out at an angle rotated by the azimuth angles φ and θ such that the Gibbs free energy difference ΔG becomes zero or positive.

但し、水晶基体11の表裏主面の法線方向がX軸方向から大きく回転してずれてしまうと、水晶基体11の表裏主面による圧力の感度が低くなってしまうので、できるだけX軸方向近傍に水晶基体11の主面法線方向を設定することが望ましい、本実施例においては、前述した各条件を満たす方位角度のうち、方位角度φが28度以上30度以下,90度以上92度以下又は148度以上150度以下の場合に、このX′軸を基軸として反時計回りにZ軸が角度α回転した時のZ軸とY′′軸とが成す方位角度θを90度以上92度以下とする場合、及び方位角度φが30度以上32度以下,88度以上90度以下又は150度以上152度以下の場合に、このX′軸を基軸として反時計回りにZ軸が角度α回転した時のZ軸とY′′軸とが成す方位角度θを88度以上90度以下とする条件で切り出した水晶板21を用いる。上記各方位角で作成した水晶板21から、水晶板21の厚み方向を水晶基体11の厚み方向として短円柱形状の水晶基体11を形成した場合に、上記数式を充たす他の方位角で形成した場合に比べて、圧力に対する感度を高くすることができる。   However, if the normal direction of the front and back main surfaces of the quartz substrate 11 is largely rotated and deviated from the X-axis direction, the pressure sensitivity due to the front and back main surfaces of the quartz substrate 11 is lowered, so that it is as close to the X-axis direction as possible. In this embodiment, it is desirable to set the normal direction of the principal surface of the quartz substrate 11. Of the azimuth angles satisfying the above-mentioned conditions, the azimuth angle φ is 28 degrees or more and 30 degrees or less, 90 degrees or more and 92 degrees. When the angle is 148 degrees or more and 150 degrees or less, the azimuth angle θ formed by the Z axis and the Y ″ axis when the Z axis rotates an angle α counterclockwise with the X ′ axis as a base axis is 90 degrees or more and 92 degrees. When the angle is less than or equal to degrees, and when the azimuth angle φ is 30 degrees or more and 32 degrees or less, 88 degrees or more and 90 degrees or less, or 150 degrees or more and 152 degrees or less, the Z axis is an angle counterclockwise from the X ′ axis as a base axis The Z-axis and Y'-axis when α rotates A crystal plate 21 cut out under the condition that the azimuth angle θ is 88 degrees or more and 90 degrees or less is used. When the quartz substrate 11 having a short cylindrical shape is formed from the quartz plate 21 prepared at each azimuth angle with the thickness direction of the quartz plate 21 as the thickness direction of the quartz substrate 11, the quartz plate 21 is formed at another azimuth angle satisfying the above formula. Compared to the case, sensitivity to pressure can be increased.

上記の方位角度で切り出した水晶板21から図2のように、複数個の短円柱状の水晶基体11を形成し、個片化した水晶基体11の表裏円形状主面に電極膜12を形成し圧力センサ素子を成し、この素子をセンサパッケージ等に設置して圧力センサとして用いる。   As shown in FIG. 2, a plurality of short cylindrical crystal bases 11 are formed from the crystal plate 21 cut out at the above azimuth angle, and the electrode films 12 are formed on the front and back circular main surfaces of the crystal base 11 separated into pieces. A pressure sensor element is formed, and this element is installed in a sensor package or the like and used as a pressure sensor.

尚、本実施例では水晶基体11の形状を短円柱形状としたが、本発明は水晶基体11の形状をこれに限定するものではなく、他に短角柱形状や短円筒形状(主面形状がリング形状)のものでも良い。   In the present embodiment, the quartz substrate 11 has a short cylindrical shape. However, the present invention does not limit the shape of the quartz substrate 11 to other shapes. Ring shape) may also be used.

図1は本発明における圧力センサ素子の外観を示した斜視図、及び素子の結晶軸方向を示す方位指標である。FIG. 1 is a perspective view showing the appearance of a pressure sensor element according to the present invention, and an orientation index indicating the crystal axis direction of the element. 図2は図1に開示した圧力センサ素子を形成するための水晶板を示した斜視図、及び水晶板の結晶軸方向を示す方位指標である。FIG. 2 is a perspective view showing a crystal plate for forming the pressure sensor element disclosed in FIG. 1, and an orientation index showing the crystal axis direction of the crystal plate. 図3は本発明における一水晶板の切り出す切断角度を説明する図である。FIG. 3 is a view for explaining the cutting angle of one crystal plate in the present invention.

符号の説明Explanation of symbols

10・・・圧力センサ素子
11・・・水晶基体
12・・・電極膜
21・・・水晶板
DESCRIPTION OF SYMBOLS 10 ... Pressure sensor element 11 ... Crystal base material 12 ... Electrode film | membrane 21 ... Crystal plate

Claims (3)

水晶結晶体の各結晶軸のうち、Z軸を基軸として反時計回りにX軸が回転したX′軸とX軸とが成す方位角度がφ、該X′軸を基軸として反時計回りに該Z軸が角度α回転したときのZ軸と2回回転したY′′軸とが成す方位角度がθであり、X′軸,Y′′軸及びZ′軸の各方向を各辺成分とする矩形状の水晶板から形成されている圧力センサ素子において、
ギブスの自由エネルギー差ΔGの結晶方位依存性を求める次式
Figure 2007057382
でΔGが0又は正となるような該方位角度φ及び該方位角度θとして切り出された水晶板より形成されていることを特徴とする圧力センサ素子。
Of the crystal axes of the crystal body, the azimuth angle formed by the X ′ axis and the X axis rotated counterclockwise from the Z axis as the base axis is φ, and the X ′ axis is the counterclockwise direction from the X ′ axis as the base axis. The azimuth angle formed by the Z axis when the Z axis rotates α and the Y ″ axis rotated twice is θ, and each direction of the X ′ axis, Y ″ axis, and Z ′ axis is defined as each side component. In the pressure sensor element formed from a rectangular crystal plate that
Obtaining crystal orientation dependence of Gibbs free energy difference ΔG
Figure 2007057382
The pressure sensor element is formed of the azimuth angle φ such that ΔG becomes 0 or positive and the crystal plate cut out as the azimuth angle θ.
水晶結晶体の各結晶軸のうち、Z軸を基軸として反時計回りにX軸が回転したX′軸とX軸とが成す方位角度が、28度以上30度以下,90度以上92度以下又は148度以上150度以下であり、該X′軸を基軸として反時計回りに該Z軸が角度α回転した時のZ軸とY′′軸とが成す方位角度が90度以上92度以下であり、回転したX′軸方向及びZ′軸方向のどちらかが長さ方向又は幅方向のうちの一辺となり、且つY′′軸方向が厚み方向となるように切り出した矩形状の水晶板から、該水晶板の厚み方向を素子の厚み方向とするように形成されていることを特徴とする圧力センサ素子。   Of the crystal axes of the quartz crystal, the azimuth angle formed by the X ′ axis and the X axis rotated counterclockwise from the Z axis as a base axis is 28 ° to 30 °, 90 ° to 92 ° Alternatively, the angle is 148 degrees or more and 150 degrees or less, and the azimuth angle formed by the Z axis and the Y ″ axis when the Z axis rotates an angle α counterclockwise with the X ′ axis as a base axis is 90 degrees or more and 92 degrees or less. A rectangular crystal plate cut out so that either the rotated X′-axis direction or the Z′-axis direction is one side of the length direction or the width direction, and the Y ″ -axis direction is the thickness direction The pressure sensor element is formed so that the thickness direction of the crystal plate is the thickness direction of the element. 水晶結晶体の各結晶軸のうち、Z軸を基軸として反時計回りにX軸が回転したX′軸とX軸とが成す方位角度が、30度以上32度以下,88度以上90度以下又は150度以上152度以下であり、該X′軸を基軸として反時計回りに該Z軸が角度α回転した時のZ軸とY′′軸とが成す方位角度が88度以上90度以下であり、回転したX′軸方向及びZ′軸方向のどちらかが長さ方向又は幅方向のうちの一辺となり、且つY′′軸方向が厚み方向となるように切り出した矩形状の水晶板から、該水晶板の厚み方向を素子の厚み方向とするように形成されていることを特徴とする圧力センサ素子。   Of each crystal axis of the quartz crystal, the azimuth angle formed by the X ′ axis and the X axis rotated counterclockwise from the Z axis as a base axis is 30 degrees or more and 32 degrees or less, and 88 degrees or more and 90 degrees or less. Or 150 degrees to 152 degrees, and the azimuth angle formed by the Z axis and the Y ″ axis when the Z axis rotates an angle α counterclockwise with the X ′ axis as a base axis is 88 degrees to 90 degrees A rectangular crystal plate cut out so that either the rotated X′-axis direction or the Z′-axis direction is one side of the length direction or the width direction, and the Y ″ -axis direction is the thickness direction The pressure sensor element is formed so that the thickness direction of the crystal plate is the thickness direction of the element.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63129314A (en) * 1986-11-20 1988-06-01 Toshiba Ceramics Co Ltd Optical filter
JPH0626957A (en) * 1992-01-21 1994-02-04 Halliburton Co Pressure transducer having quartz in single rotary cut for boosting temperature-increasing operating range
JPH07209126A (en) * 1994-01-18 1995-08-11 Ee Ii Syst Kk System for detecting and controlling combustion pressure using piezoelectric sensor
JPH08122187A (en) * 1994-10-27 1996-05-17 Fuji Oozx Inc Measuring device for pressure in cylinder in diesel engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63129314A (en) * 1986-11-20 1988-06-01 Toshiba Ceramics Co Ltd Optical filter
JPH0626957A (en) * 1992-01-21 1994-02-04 Halliburton Co Pressure transducer having quartz in single rotary cut for boosting temperature-increasing operating range
JPH07209126A (en) * 1994-01-18 1995-08-11 Ee Ii Syst Kk System for detecting and controlling combustion pressure using piezoelectric sensor
JPH08122187A (en) * 1994-10-27 1996-05-17 Fuji Oozx Inc Measuring device for pressure in cylinder in diesel engine

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