JP2017106812A - Pressure sensor chip - Google Patents

Pressure sensor chip Download PDF

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JP2017106812A
JP2017106812A JP2015240810A JP2015240810A JP2017106812A JP 2017106812 A JP2017106812 A JP 2017106812A JP 2015240810 A JP2015240810 A JP 2015240810A JP 2015240810 A JP2015240810 A JP 2015240810A JP 2017106812 A JP2017106812 A JP 2017106812A
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pressure
holding member
hole
sensor chip
diaphragm
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JP6552400B2 (en
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智久 徳田
Tomohisa Tokuda
智久 徳田
石倉 義之
Yoshiyuki Ishikura
義之 石倉
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Azbil Corp
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Abstract

PROBLEM TO BE SOLVED: To provide a pressure sensor chip that offers dramatic improvement in pressure rating as well as mitigated or suppressed degradation in machinability and response speed.SOLUTION: A pressure guide hole 11-2d formed through a stopper member has a cruciform hole shape made up of a central portion H0 positioned at the center of the cruciform and extending portions H1-H4 continuously extending in four directions from a circumference of the central portion H0. Width W of the hole shape contributes to pressure rating and length L thereof contributes to responsiveness and machinability.SELECTED DRAWING: Figure 1

Description

本発明は、一方の面および他方の面に受ける圧力差に応じた信号を出力するセンサダイアフラムを用いた圧力センサチップ、例えば圧力を受けて変位する薄板状のダイアフラム上に歪抵抗ゲージを形成し、ダイアフラムに形成された歪抵抗ゲージの抵抗値変化からダイアフラムに加わった圧力を検出する圧力センサチップに関する。   In the present invention, a strain resistance gauge is formed on a pressure sensor chip using a sensor diaphragm that outputs a signal corresponding to a pressure difference received on one surface and the other surface, for example, a thin diaphragm that is displaced by receiving pressure. The present invention relates to a pressure sensor chip that detects a pressure applied to a diaphragm from a change in resistance value of a strain resistance gauge formed on the diaphragm.

従来より、工業用の差圧センサとして、一方の面および他方の面に受ける圧力差に応じた信号を出力するセンサダイアフラムを用いた圧力センサチップを組み込んだ差圧センサが用いられている。   Conventionally, as an industrial differential pressure sensor, a differential pressure sensor incorporating a pressure sensor chip using a sensor diaphragm that outputs a signal corresponding to a pressure difference received on one surface and the other surface has been used.

この差圧センサは、高圧側および低圧側の受圧ダイアフラムに加えられる各測定圧を、圧力伝達媒体としての封入液によってセンサダイアフラムの一方の面および他方の面に導き、そのセンサダイアフラムの歪みを例えば歪抵抗ゲージの抵抗値変化として検出し、この抵抗値変化を電気信号に変換して取り出すように構成されている。   In this differential pressure sensor, each measurement pressure applied to the pressure receiving diaphragms on the high pressure side and the low pressure side is guided to one surface and the other surface of the sensor diaphragm by a sealing liquid as a pressure transmission medium, and distortion of the sensor diaphragm is, for example, It is configured to detect a change in the resistance value of the strain resistance gauge and to convert the resistance value change into an electric signal and take it out.

このような差圧センサは、例えば石油精製プラントにおける高温反応塔等の被測定流体を貯蔵する密閉タンク内の上下2位置の差圧を検出することにより、液面高さを測定するときなどに用いられる。   Such a differential pressure sensor is used, for example, when measuring the liquid level height by detecting the differential pressure at two positions above and below in a closed tank that stores a fluid to be measured such as a high-temperature reaction tower in an oil refinery plant. Used.

図19に従来の差圧センサの概略構成を示す。この差圧センサ100は、センサダイアフラム(図示せず)を有する圧力センサチップ1をメータボディ2に組み込んで構成される。圧力センサチップ1におけるセンサダイアフラムは、シリコンやガラス等からなり、薄板状に形成されたダイアフラムの表面に歪抵抗ゲージが形成されている。メータボディ2は、金属製の本体部3とセンサ部4とからなり、本体部3の側面に一対の受圧部をなすバリアダイアフラム(受圧ダイアフラム)5a,5bが設けられ、センサ部4に圧力センサチップ1が組み込まれている。   FIG. 19 shows a schematic configuration of a conventional differential pressure sensor. The differential pressure sensor 100 is configured by incorporating a pressure sensor chip 1 having a sensor diaphragm (not shown) into a meter body 2. The sensor diaphragm in the pressure sensor chip 1 is made of silicon, glass, or the like, and a strain resistance gauge is formed on the surface of the diaphragm formed in a thin plate shape. The meter body 2 includes a metal main body portion 3 and a sensor portion 4, and barrier diaphragms (pressure receiving diaphragms) 5 a and 5 b forming a pair of pressure receiving portions are provided on the side surface of the main body portion 3. Chip 1 is incorporated.

メータボディ2において、センサ部4に組み込まれた圧力センサチップ1と本体部3に設けられたバリアダイアフラム5a,5bとの間は、大径のセンタダイアフラム6により隔離された圧力緩衝室7a,7bを介してそれぞれ連通され、圧力センサチップ1とバリアダイアフラム5a,5bとを結ぶ連通路8a,8bにシリコーンオイル等の圧力伝達媒体9a,9bが封入されている。   In the meter body 2, the pressure buffer chambers 7 a and 7 b are separated by a large-diameter center diaphragm 6 between the pressure sensor chip 1 incorporated in the sensor unit 4 and the barrier diaphragms 5 a and 5 b provided in the main body 3. Are connected to each other, and pressure transmission media 9a, 9b such as silicone oil are sealed in communication passages 8a, 8b connecting the pressure sensor chip 1 and the barrier diaphragms 5a, 5b.

なお、シリコーンオイル等の圧力媒体が必要となるのは、センサダイアフラムに対する計測媒体中の異物付着を防ぐこと、センサダイアフラムを腐食させないため、耐食性を持つ受圧ダイアフラムと応力(圧力)感度を持つセンサダイアフラムとを分離する必要があるためである。   The pressure medium such as silicone oil is required because it prevents the foreign matter in the measurement medium from adhering to the sensor diaphragm and does not corrode the sensor diaphragm. Therefore, the pressure receiving diaphragm has corrosion resistance and the sensor diaphragm has stress (pressure) sensitivity. This is because it is necessary to separate them.

この差圧センサ100では、図20Aに定常状態時の動作態様を模式的に示すように、プロセスからの第1の流体圧力(第1の測定圧)P1がバリアダイアフラム5aに印加され、プロセスからの第2の流体圧力(第2の測定圧)P2がバリアダイアフラム5bに印加される。これにより、バリアダイアフラム5a,5bが変位し、その加えられた圧力P1,P2がセンタダイアフラム6により隔離された圧力緩衝室7a,7bを介し、圧力伝達媒体9a,9bを通して、圧力センサチップ1のセンサダイアフラムの一方の面および他方の面にそれぞれ導かれる。この結果、圧力センサチップ1のセンサダイアフラムは、その導かれた圧力P1,P2の差圧ΔPに相当する変位を呈することになる。   In the differential pressure sensor 100, as schematically shown in FIG. 20A, the operation state in the steady state, the first fluid pressure (first measured pressure) P1 from the process is applied to the barrier diaphragm 5a, and the process is started. The second fluid pressure (second measured pressure) P2 is applied to the barrier diaphragm 5b. Thereby, the barrier diaphragms 5a and 5b are displaced, and the applied pressures P1 and P2 are passed through the pressure transmission chambers 9a and 7b through the pressure buffering chambers 7a and 7b isolated by the center diaphragm 6, and the pressure sensor chip 1 They are guided to one side and the other side of the sensor diaphragm, respectively. As a result, the sensor diaphragm of the pressure sensor chip 1 exhibits a displacement corresponding to the differential pressure ΔP between the introduced pressures P1 and P2.

これに対して、例えば、バリアダイアフラム5aに過大圧Poverが加わると、図20Bに示すようにバリアダイアフラム5aが大きく変位し、これに伴ってセンタダイアフラム6が過大圧Poverを吸収するように変位する。そして、バリアダイアフラム5aがメータボディ2の凹部10aの底面(過大圧保護面)に着底し、その変位が規制されると、バリアダイアフラム5aを介するセンサダイアフラムへのそれ以上の差圧ΔPの伝達が阻止される。バリアダイアフラム5bに過大圧Poverが加わった場合も、バリアダイアフラム5aに過大圧Poverが加わった場合と同様にして、バリアダイアフラム5bがメータボディ2の凹部10bの底面(過大圧保護面)に着底し、その変位が規制されると、バリアダイアフラム5bを介するセンサダイアフラムへのそれ以上の差圧ΔPの伝達が阻止される。この結果、過大圧Poverの印加による圧力センサチップ1の破損、すなわち圧力センサチップ1におけるセンサダイアフラムの破損が未然に防止される。   On the other hand, for example, when an excessive pressure Pover is applied to the barrier diaphragm 5a, the barrier diaphragm 5a is largely displaced as shown in FIG. 20B, and the center diaphragm 6 is displaced so as to absorb the excessive pressure Pover. . When the barrier diaphragm 5a settles on the bottom surface (overpressure protection surface) of the recess 10a of the meter body 2 and its displacement is restricted, transmission of the further differential pressure ΔP to the sensor diaphragm via the barrier diaphragm 5a. Is blocked. When the overpressure Pover is applied to the barrier diaphragm 5b, the barrier diaphragm 5b is attached to the bottom surface (overpressure protection surface) of the concave portion 10b of the meter body 2 in the same manner as when the overpressure Pover is applied to the barrier diaphragm 5a. When the displacement is restricted, further transmission of the differential pressure ΔP to the sensor diaphragm via the barrier diaphragm 5b is prevented. As a result, damage to the pressure sensor chip 1 due to application of the excessive pressure Pover, that is, damage to the sensor diaphragm in the pressure sensor chip 1 is prevented.

この差圧センサ100では、メータボディ2に圧力センサチップ1を内包させているので、プロセス流体など外部腐食環境から圧力センサチップ1を保護することができる。しかしながら、センタダイアフラム6やバリアダイアフラム5a,5bの変位を規制するための凹部10a,10bを備え、これらによって圧力センサチップ1を過大圧Poverから保護する構造をとっているので、その形状が大型化することが避けられない。   In the differential pressure sensor 100, since the pressure sensor chip 1 is included in the meter body 2, the pressure sensor chip 1 can be protected from an external corrosive environment such as a process fluid. However, since the concave portions 10a and 10b for restricting the displacement of the center diaphragm 6 and the barrier diaphragms 5a and 5b are provided and the pressure sensor chip 1 is protected from the excessive pressure Pover by these, the shape is increased. Inevitable to do.

そこで、圧力センサチップに第1のストッパ部材および第2のストッパ部材を設け、この第1のストッパ部材および第2のストッパ部材の凹部をセンサダイアフラムの一方の面および他方の面に対峙させることによって、過大圧が印加された時のセンサダイアフラムの過度な変位を阻止し、これによってセンサダイアフラムの破損・破壊を防止する構造が提案されている(例えば、特許文献1参照)。   Therefore, the pressure sensor chip is provided with a first stopper member and a second stopper member, and the concave portions of the first stopper member and the second stopper member are opposed to one surface and the other surface of the sensor diaphragm. There has been proposed a structure that prevents excessive displacement of the sensor diaphragm when an excessive pressure is applied, thereby preventing damage or destruction of the sensor diaphragm (see, for example, Patent Document 1).

図21に特許文献1に示された構造を採用した圧力センサチップの概略を示す。同図において、11−1はセンサダイアフラム、11−2および11−3はセンサダイアフラム11−1を挟んで接合された第1および第2のストッパ部材(保持部材)、11−4および11−5はストッパ部材11−2および11−3に接合された第1および第2の台座である。ストッパ部材11−2,11−3や台座11−4,11−5はシリコンやガラスなどにより構成されている。   FIG. 21 shows an outline of a pressure sensor chip that employs the structure disclosed in Patent Document 1. In the figure, reference numeral 11-1 denotes a sensor diaphragm, 11-2 and 11-3 denote first and second stopper members (holding members) joined with the sensor diaphragm 11-1 interposed therebetween, and 11-4 and 11-5. Are first and second pedestals joined to the stopper members 11-2 and 11-3. The stopper members 11-2 and 11-3 and the pedestals 11-4 and 11-5 are made of silicon or glass.

この圧力センサチップ11において、ストッパ部材11−2,11−3には凹部11−2a,11−3aが形成されており、ストッパ部材11−2の凹部11−2aをセンサダイアフラム11−1の一方の面11−1aに対峙させ、ストッパ部材11−3の凹部11−3aをセンサダイアフラム11−1の他方の面11−1bに対峙させ、ストッパ部材11−2の周縁部11−2cをセンサダイアフラム11−1の一方の面11−1aに対面させて接合し、ストッパ部材11−3の周縁部11−3cをセンサダイアフラム11−1の他方の面11−1bに対面させて接合している。   In this pressure sensor chip 11, recesses 11-2a and 11-3a are formed in the stopper members 11-2 and 11-3, and the recess 11-2a of the stopper member 11-2 is connected to one of the sensor diaphragms 11-1. The recess 11-3a of the stopper member 11-3 is opposed to the other surface 11-1b of the sensor diaphragm 11-1, and the peripheral portion 11-2c of the stopper member 11-2 is opposed to the sensor diaphragm. 11-1 is made to face one surface 11-1a and joined, and the peripheral portion 11-3c of the stopper member 11-3 is made to face the other surface 11-1b of the sensor diaphragm 11-1 and joined.

ストッパ部材11−2,11−3の凹部11−2a,11−3aは、センサダイアフラム11−1の変位に沿った曲面(非球面)とされており、その頂部に圧力導入孔(導圧孔)11−2b,11−3bが形成されている。また、台座11−4,11−5にも、ストッパ部材11−2,11−3の導圧孔11−2b,11−3bに対応する位置に、圧力導入孔(導圧孔)11−4a,11−5aが形成されている。   The recesses 11-2a and 11-3a of the stopper members 11-2 and 11-3 are curved surfaces (aspherical surfaces) along the displacement of the sensor diaphragm 11-1, and pressure introduction holes (pressure guide holes) are formed at the tops thereof. ) 11-2b and 11-3b are formed. Further, the pedestals 11-4 and 11-5 also have pressure introduction holes (pressure holes) 11-4a at positions corresponding to the pressure holes 11-2b and 11-3b of the stopper members 11-2 and 11-3. 11-5a are formed.

このような圧力センサチップ11を用いると、センサダイアフラム11−1の一方の面11−1aに過大圧が印加されてセンサダイアフラム11−1が変位したとき、その変位面の全体がストッパ部材11−3の凹部11−3aの曲面によって受け止められる。また、センサダイアフラム11−1の他方の面11−1bに過大圧が印加されてセンサダイアフラム11−1が変位したとき、その変位面の全体がストッパ部材11−2の凹部11−2aの曲面によって受け止められる。   When such a pressure sensor chip 11 is used, when an excessive pressure is applied to one surface 11-1a of the sensor diaphragm 11-1 and the sensor diaphragm 11-1 is displaced, the entire displacement surface is the stopper member 11-. 3 is received by the curved surface of the concave portion 11-3a. Further, when an excessive pressure is applied to the other surface 11-1b of the sensor diaphragm 11-1 and the sensor diaphragm 11-1 is displaced, the entire displacement surface is caused by the curved surface of the recess 11-2a of the stopper member 11-2. It is accepted.

これにより、センサダイアフラム11−1に過大圧が印加された時の過度な変位が阻止され、センサダイアフラム11−1の周縁部に応力集中が生じないようにして、過大圧の印加によるセンサダイアフラム11−1の不本意な破壊を効果的に防ぎ、その過大圧保護動作圧力(耐圧)を高めることが可能となる。また、図19に示された構造において、センタダイアフラム6や圧力緩衝室7a,7bをなくし、バリアダイアフラム5a,5bからセンサダイアフラム11−1に対して直接的に測定圧P1,P2を導くようにして、メータボディ2の小型化を図ることが可能となる。   Accordingly, excessive displacement when an excessive pressure is applied to the sensor diaphragm 11-1 is prevented, and stress concentration does not occur in the peripheral portion of the sensor diaphragm 11-1, so that the sensor diaphragm 11 by applying the excessive pressure is prevented. -1 can be effectively prevented and the overpressure protection operating pressure (withstand pressure) can be increased. In the structure shown in FIG. 19, the center diaphragm 6 and the pressure buffering chambers 7a and 7b are eliminated, and the measurement pressures P1 and P2 are directly guided from the barrier diaphragms 5a and 5b to the sensor diaphragm 11-1. Thus, the meter body 2 can be miniaturized.

特開2005−69736号公報JP 2005-69736 A

このような圧力センサチップ11の構造において、小型化、高感度化の両立を目指した場合、センサダイアフラム11−1の厚さを薄く必要がある。しかしながら、ダイアフラム11−1が薄くなればなるほど、ストッパ部材11−2,11−3におけるストッパ効果の低い導圧孔11−2b,11−3bの開口部で、ダイアフラム11−1が破壊されてしまう虞が高くなる。   In such a structure of the pressure sensor chip 11, the sensor diaphragm 11-1 needs to be thin when aiming at both miniaturization and high sensitivity. However, the thinner the diaphragm 11-1, the more the diaphragm 11-1 is destroyed at the openings of the pressure guiding holes 11-2b and 11-3b, which have a lower stopper effect in the stopper members 11-2 and 11-3. The fear increases.

ダイアフラム11−1が破壊されてしまう虞をなくすために、すなわち耐圧を高めるために、例えばセンサダイアフラム11−1の他方の面11−1bを高圧の測定圧の受圧面とした場合、導圧孔11−2bの孔径を小さくすることが考えられる。   In order to eliminate the possibility that the diaphragm 11-1 will be destroyed, that is, in order to increase the pressure resistance, for example, when the other surface 11-1b of the sensor diaphragm 11-1 is a pressure receiving surface of a high measurement pressure, a pressure guide hole It is conceivable to reduce the diameter of 11-2b.

すなわち、図21における導圧孔11−2bの孔径をφ1(例えば、φ1=200μm)とした場合、図22および図23に示すように、導圧孔11−2bの孔径φ1よりも小径の孔径φ2(例えば、φ2=25μm)とすることが考えられる。   That is, when the hole diameter of the pressure introducing hole 11-2b in FIG. 21 is φ1 (for example, φ1 = 200 μm), as shown in FIGS. 22 and 23, the hole diameter is smaller than the hole diameter φ1 of the pressure introducing hole 11-2b. It can be considered that φ2 (for example, φ2 = 25 μm).

しかし、このようにすると、導圧孔11−2b’のアスペクト比(孔の深さ/孔の径)が高くなり、加工難易度の上昇、応答速度の劣化といった問題が生じる。なお、導圧孔11−2b’の孔の深さは、例えば2mmとされている。   However, in this case, the aspect ratio (hole depth / hole diameter) of the pressure guide hole 11-2b 'increases, and problems such as an increase in the difficulty of processing and a deterioration in response speed occur. Note that the depth of the pressure guiding hole 11-2b 'is, for example, 2 mm.

本発明は、このような課題を解決するためになされたもので、その目的とするところは、加工性、応答速度の劣化を緩和、抑制しつつ、飛躍的な耐圧向上を達成することが可能な圧力センサチップを提供することにある。   The present invention has been made to solve such problems, and the object of the present invention is to achieve dramatic improvement in pressure resistance while mitigating and suppressing deterioration of workability and response speed. Is to provide a simple pressure sensor chip.

このような目的を達成するために本発明は、圧力差に応じた信号を出力するセンサダイアフラムと、このセンサダイアフラムの一方の面および他方の面にその周縁部を対面させて接合され、センサダイアフラムへ測定圧を導く導圧孔を有する第1および第2の保持部材とを備えた圧力センサチップにおいて、第1の保持部材は、センサダイアフラムに過大圧が印加された時の当該センサダイアフラムの過度な変位を阻止するそのセンサダイアフラムの変位に沿った曲面状の凹部を備え、第1の保持部材の導圧孔は、第1の保持部材を貫いて第1の保持部材の曲面状の凹部に開口し、第1の保持部材の導圧孔の第1の保持部材を貫く方向から見た孔形状は、第1の保持部材の導圧孔の中心に位置する中心部分とこの中心部分の外縁の一部から連続して中心から外方向に延びた1つ以上の延伸部分とから構成された形状とされ、第1の保持部材の導圧孔の孔形状の延伸部分の延伸方向に直交する方向の最大幅は、第1の保持部材の導圧孔の孔形状の中心部分の外縁の幅以下とされていることを特徴とする。   In order to achieve such an object, the present invention provides a sensor diaphragm that outputs a signal corresponding to a pressure difference, and a sensor diaphragm that is joined to one surface and the other surface of the sensor diaphragm with their peripheral portions facing each other. In the pressure sensor chip having the first and second holding members having the pressure introducing holes for guiding the measurement pressure to the first holding member, the first holding member is an excessive portion of the sensor diaphragm when an excessive pressure is applied to the sensor diaphragm. A concave portion having a curved surface along the displacement of the sensor diaphragm for preventing a large displacement, and the pressure introducing hole of the first holding member penetrates the first holding member to the curved concave portion of the first holding member. The hole shape of the pressure holding hole of the first holding member viewed from the direction passing through the first holding member has a central portion located at the center of the pressure guiding hole of the first holding member and an outer edge of the central portion. From some of the ream The maximum width of the first holding member in the direction perpendicular to the extending direction of the extending portion of the hole-shaped extending portion of the pressure guiding hole of the first holding member is a shape composed of one or more extending portions extending outward from the center. The width of the outer edge of the center portion of the hole shape of the pressure guiding hole of the first holding member is not more than the width.

本発明において、センサダイアフラムの他方の面に高圧の測定圧がかかった場合、センサダイアフラムは第1の保持部材側に撓み、第1の保持部材の曲面状の凹部に着底する。この第1の保持部材の曲面状の凹部には第1の保持部材の導圧孔が開口している。この第1の保持部材の導圧孔の第1の保持部材を貫く方向から見た孔形状は、第1の保持部材の導圧孔の中心に位置する中心部分と、この中心部分の外縁の一部から連続して中心から外方向に延びた1つ以上の延伸部分とから構成された形状とされている。また、第1の保持部材の導圧孔の孔形状の延伸部分の延伸方向に直交する方向の最大幅は、第1の保持部材の導圧孔の孔形状の中心部分の外縁の幅以下とされている。   In the present invention, when a high measurement pressure is applied to the other surface of the sensor diaphragm, the sensor diaphragm bends toward the first holding member and settles in the curved concave portion of the first holding member. A pressure guide hole of the first holding member opens in the curved concave portion of the first holding member. The hole shape of the pressure guiding hole of the first holding member viewed from the direction passing through the first holding member has a central portion located at the center of the pressure guiding hole of the first holding member and an outer edge of the central portion. It is made into the shape comprised from the one or more extending | stretching part extended from the center to the outward direction continuously from one part. The maximum width in the direction orthogonal to the extending direction of the hole-shaped extending portion of the pressure holding hole of the first holding member is equal to or less than the width of the outer edge of the hole-shaped central portion of the pressure holding hole of the first holding member. Has been.

例えば、本発明において、第1の保持部材の導圧孔の孔形状を十字形とした場合、その十字形の中心に位置する孔の形状が中心部分、この中心部分の外縁から連続して四方に延びた孔の形状が延伸部分となる。この場合、延伸部分の延伸方向を導圧孔の孔形状の径方向、延伸部分の延伸方向に直交する方向を導圧孔の孔形状の幅方向とした場合、幅方向の長さは耐圧に寄与し、幅方向の長さを小さくすることにより耐圧が高められる。これに対し、径方向の長さは応答性と加工性に寄与し、径方向の長さを大きくすることにより応答性と加工性が高められる。   For example, in the present invention, when the shape of the pressure guiding hole of the first holding member is a cross shape, the shape of the hole located at the center of the cross shape is the center portion, and the four sides continuously from the outer edge of the center portion. The shape of the hole extending in the region becomes the extended portion. In this case, when the extending direction of the extending portion is the radial direction of the hole shape of the pressure-immobilizing hole and the direction orthogonal to the extending direction of the extending portion is the width direction of the hole-shaped hole of the guiding hole, the length in the width direction is the pressure resistance. The breakdown voltage is increased by reducing the length in the width direction. On the other hand, the length in the radial direction contributes to responsiveness and workability, and the responsiveness and workability are improved by increasing the length in the radial direction.

本発明において、センサダイアフラム上で高圧側の測定圧を受ける面が必ず決まっている場合には、センサダイアフラムの他方の面を高圧側の測定圧の受圧面とし、一方の面を低圧側の測定圧の受圧面とする。すなわち、センサダイアフラム上で高圧側の測定圧を受ける面が必ず決まっている場合には、センサダイアフラムの他方の面を高圧側の測定圧の受圧面とし、第2の保持部材の導圧孔を通して高圧側の測定圧が導かれるようにする。   In the present invention, when the surface that receives the high-pressure side measurement pressure on the sensor diaphragm is always determined, the other surface of the sensor diaphragm is the pressure-receiving surface for the high-pressure side measurement, and one surface is the low-pressure side measurement surface. The pressure receiving surface. That is, when the surface on the sensor diaphragm that receives the high-pressure side measurement pressure is always determined, the other surface of the sensor diaphragm is used as the pressure-receiving surface for the high-pressure side measurement pressure, and is passed through the pressure guide hole of the second holding member. The measured pressure on the high pressure side should be derived.

本発明において、第2の保持部材にもセンサダイアフラムに過大圧が印加された時のセンサダイアフラムの過度な変位を阻止するそのセンサダイアフラムの変位に沿った曲面状の凹部を備えるものとし、第1の保持部材の導圧孔と同様の孔形状の導圧孔を第2の保持部材の曲面状の凹部に開口させるようにしてもよい。このようにすると、センサダイアフラムのどちらの面が高圧側の測定圧の受圧面となっても、中心部分と延伸部分とから構成される孔形状の導圧孔が開口されている凹部にセンサダイアフラムを着底させるようにすることができる。   In the present invention, the second holding member is also provided with a curved concave portion along the displacement of the sensor diaphragm that prevents excessive displacement of the sensor diaphragm when an excessive pressure is applied to the sensor diaphragm. A hole-shaped pressure guiding hole similar to the pressure guiding hole of the holding member may be opened in the curved concave portion of the second holding member. In this case, the sensor diaphragm is formed in the recess in which the hole-shaped pressure guiding hole constituted by the center portion and the extending portion is opened, regardless of which surface of the sensor diaphragm is the pressure receiving surface for the measurement pressure on the high pressure side. Can be made to bottom.

本発明によれば、第1の保持部材の曲面状の凹部に開口する第1の保持部材の導圧孔の孔形状を、第1の保持部材の導圧孔の中心に位置する中心部分とこの中心部分の外縁の一部から連続して中心から外方向に延びた1つ以上の延伸部分とから構成された形状とし、第1の保持部材の導圧孔の孔形状の延伸部分の延伸方向に直交する方向の最大幅を第1の保持部材の導圧孔の孔形状の中心部分の外縁の幅以下とするようにしたので、延伸部分の延伸方向を導圧孔の孔形状の径方向、延伸部分の延伸方向に直交する方向を導圧孔の孔形状の幅方向とした場合、幅方向の長さを小さくすることにより耐圧が高められ、径方向の長さを大きくすることにより応答性と加工性が高められるものとなり、加工性、応答速度の劣化を緩和、抑制しつつ、飛躍的な耐圧向上を達成することが可能となる。   According to the present invention, the hole shape of the pressure guiding hole of the first holding member that opens in the curved concave portion of the first holding member is the center portion positioned at the center of the pressure guiding hole of the first holding member; It is made into the shape comprised from the one or more extending | stretching part extended from the center to the outward direction continuously from a part of outer edge of this center part, and extending | stretching the extending | stretching part of the hole shape of the pressure guide hole of a 1st holding member Since the maximum width in the direction orthogonal to the direction is set to be equal to or smaller than the width of the outer edge of the hole-shaped central portion of the pressure-holding hole of the first holding member, the extending direction of the extended portion is the diameter of the hole-shaped hole of the pressure-receiving hole. When the direction perpendicular to the extending direction of the direction and the extending part is the width direction of the hole shape of the pressure introducing hole, the pressure resistance is increased by reducing the length in the width direction, and the length in the radial direction is increased. The responsiveness and workability will be improved, and while the deterioration of workability and response speed will be mitigated and suppressed, It is possible to achieve a specific improvement in withstand voltage.

図1は、本発明に係る圧力センサチップの第1の実施の形態(実施の形態1)の概略を示す図である。FIG. 1 is a diagram showing an outline of a first embodiment (Embodiment 1) of a pressure sensor chip according to the present invention. 図2は、この圧力センサチップのストッパ部材に形成する導圧孔の孔形状(十字形の孔形状)を示す平面図である。FIG. 2 is a plan view showing the hole shape (cross-shaped hole shape) of the pressure guide hole formed in the stopper member of the pressure sensor chip. 図3は、導圧孔の孔形状を十字形とした場合と小径の孔径φ2とした場合との比較を示す図である。FIG. 3 is a diagram showing a comparison between the case where the hole shape of the pressure guiding hole is a cross shape and the case where the hole diameter is a small diameter φ2. 図4は、延伸部分の角部に接する直径Rの円を十字形の孔形状の導圧孔の中心部分と考えた例を示す図である。FIG. 4 is a diagram illustrating an example in which a circle having a diameter R in contact with a corner portion of an extended portion is considered as a central portion of a cross-shaped hole-shaped pressure guiding hole. 図5は、一辺の長さがWの正方形を十字形の孔形状の導圧孔の中心部分と考えた例を示す図である。FIG. 5 is a diagram illustrating an example in which a square having a side length of W is considered as a central portion of a cross-shaped pressure guide hole. 図6は、導圧孔の孔形状をY字形とした例を示す図である。FIG. 6 is a diagram illustrating an example in which the hole shape of the pressure guide hole is a Y-shape. 図7は、一辺の長さがWの正三角形をY字形の孔形状の導圧孔の中心部分と考えた例を示す図である。FIG. 7 is a diagram illustrating an example in which an equilateral triangle having a side length of W is considered as a central portion of a Y-shaped hole-shaped pressure guiding hole. 図8は、十字形の孔形状の導圧孔の延伸部分を延伸方向の始端から終端に向かって細くするようにした例を示す図である。FIG. 8 is a diagram showing an example in which the extending portion of the cross-shaped hole-shaped pressure guiding hole is made narrower from the start end to the end in the extending direction. 図9は、本発明に係る圧力センサチップの第2の実施の形態(実施の形態2)の概略を示す図である。FIG. 9 is a diagram showing an outline of the second embodiment (Embodiment 2) of the pressure sensor chip according to the present invention. 図10は、本発明に係る圧力センサチップの第3の実施の形態(実施の形態3)の概略を示す図である。FIG. 10 is a diagram showing an outline of a third embodiment (Embodiment 3) of a pressure sensor chip according to the present invention. 図11は、下側のストッパ部材の曲面状の凹部の底面上に離散的に形成された複数の凸部の形状(円柱状)を導圧孔の孔形状と合わせて示す平面図である。FIG. 11 is a plan view showing the shape (columnar shape) of a plurality of convex portions discretely formed on the bottom surface of the curved concave portion of the lower stopper member together with the shape of the pressure guiding hole. 図12は、下側のストッパ部材の曲面状の凹部の底面上に離散的に形成された複数の凸部の形状(六角柱状)を導圧孔の孔形状と合わせて示す平面図である。FIG. 12 is a plan view showing the shape of a plurality of convex portions (hexagonal columnar shape) discretely formed on the bottom surface of the curved concave portion of the lower stopper member together with the shape of the pressure guiding hole. 図13は、凸部を円柱状とした曲面状の凹部に十字形の孔形状とした複数の導圧孔を形成した例を示す図である。FIG. 13 is a diagram showing an example in which a plurality of pressure guiding holes having a cross-shaped hole shape are formed in a curved concave portion having a cylindrical convex portion. 図14は、凸部を円柱状とした曲面状の凹部にY字形の孔形状とした複数の導圧孔を形成した例を示す図である。FIG. 14 is a diagram illustrating an example in which a plurality of pressure guiding holes having a Y-shaped hole shape are formed in a curved concave portion having a cylindrical convex portion. 図15は、本発明に係る圧力センサチップの第4の実施の形態(実施の形態4)の概略を示す図である。FIG. 15 is a diagram schematically showing a fourth embodiment (Embodiment 4) of a pressure sensor chip according to the present invention. 図16は、上側のストッパ部材の曲面状の凹部の底面上に離散的に形成された複数の凸部の形状(円柱状)を導圧孔の孔形状と合わせて示す平面図である。FIG. 16 is a plan view showing the shape (columnar shape) of a plurality of convex portions discretely formed on the bottom surface of the curved concave portion of the upper stopper member together with the shape of the pressure guiding hole. 図17は、上側のストッパ部材の曲面状の凹部の底面上に離散的に形成された複数の凸部の形状(六角柱状)を導圧孔の孔形状と合わせて示す平面図である。FIG. 17 is a plan view showing the shape (hexagonal column shape) of a plurality of convex portions discretely formed on the bottom surface of the curved concave portion of the upper stopper member together with the hole shape of the pressure introducing hole. 図18は、本発明に係る圧力センサチップの第5の実施の形態(実施の形態5)の概略を示す図である。FIG. 18 is a diagram showing an outline of a fifth embodiment (Embodiment 5) of a pressure sensor chip according to the present invention. 図19は、従来の差圧センサの概略構成を示す図である。FIG. 19 is a diagram showing a schematic configuration of a conventional differential pressure sensor. 図20Aは、この差圧センサの正常時の動作態様を模式的に示す図である。FIG. 20A is a diagram schematically illustrating an operation mode of the differential pressure sensor when it is normal. 図20Bは、この差圧センサの過大圧印加時の動作態様を模式的に示す図である。FIG. 20B is a diagram schematically illustrating an operation mode of the differential pressure sensor when an excessive pressure is applied. 図21は、特許文献1に示された構造を採用したセンサチップの概略を示す図である。FIG. 21 is a diagram showing an outline of a sensor chip adopting the structure shown in Patent Document 1. As shown in FIG. 図22は、ダイアフラムが着底する側のストッパ部材の導圧孔の径を小さくした例を示す図である。FIG. 22 is a diagram showing an example in which the diameter of the pressure introducing hole of the stopper member on the side on which the diaphragm bottoms is reduced. 図23は、ストッパ部材の導圧孔の孔径を小さくする前と小さくした後の孔径を比較して示す図である。FIG. 23 is a diagram comparing the hole diameters before and after reducing the diameter of the pressure guiding holes of the stopper member.

以下、本発明の実施の形態を図面に基づいて詳細に説明する。   Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

〔実施の形態1〕
図1はこの発明に係る圧力センサチップの第1の実施の形態(実施の形態1)の概略を示す図である。同図において、図21と同一符号は図21を参照して説明した構成要素と同一或いは同等構成要素を示し、その説明は省略する。なお、この実施の形態では、圧力センサチップを符号11Aで示し、図21に示された圧力センサチップ11と区別する。
[Embodiment 1]
FIG. 1 is a diagram schematically showing a first embodiment (Embodiment 1) of a pressure sensor chip according to the present invention. In the figure, the same reference numerals as those in FIG. 21 denote the same or equivalent components as those described with reference to FIG. 21, and the description thereof will be omitted. In this embodiment, the pressure sensor chip is denoted by reference numeral 11A and is distinguished from the pressure sensor chip 11 shown in FIG.

この圧力センサチップ11Aにおいて、ストッパ部材11−2(下側のストッパ部材)の曲面状の凹部11−2aの頂部には、ストッパ部材11−2を貫いて導圧孔11−2dが設けられている。この導圧孔11−2dの孔形状は、すなわちストッパ部材11−2を貫く方向から見た孔形状(平面形状)は、十字形とされている。   In this pressure sensor chip 11A, a pressure guide hole 11-2d is provided at the top of the curved concave portion 11-2a of the stopper member 11-2 (lower stopper member) through the stopper member 11-2. Yes. The hole shape (planar shape) of the pressure guiding hole 11-2d viewed from the direction penetrating the stopper member 11-2 is a cross shape.

図2にストッパ部材11−2の導圧孔11−2dの孔形状を示す。導圧孔11−2dは、この孔形状でストッパ部材11−2を貫いて、曲面状の凹部11−2aの頂部に開口している。   FIG. 2 shows the hole shape of the pressure guiding hole 11-2d of the stopper member 11-2. The pressure guide hole 11-2d penetrates the stopper member 11-2 in this hole shape and opens at the top of the curved recess 11-2a.

この導圧孔11−2dの孔形状は、十字形の中心に位置する孔を中心部分H0と、この中心部分H0の外縁から連続して四方(中心から外方向)に延びた4つの孔を延伸部分H1〜H4とから構成されている。導圧孔11−2dの孔形状は、この他にも種々考えられるが、この十字形の孔形状の導圧孔11−2dを導圧孔11−2d1として他と区別する。   The hole shape of the pressure guide hole 11-2d includes a hole located at the center of the cross shape as a central portion H0 and four holes extending from the outer edge of the central portion H0 in four directions (outward from the center). It is comprised from extending | stretching part H1-H4. Various other shapes of the pressure guide hole 11-2d are conceivable, but the cross-shaped pressure guide hole 11-2d is distinguished from others as the pressure guide hole 11-2d1.

この導圧孔11−2d1の孔形状において、延伸部分H1〜H4の延伸方向を導圧孔11−2d1の孔形状の径方向、延伸部分H1〜H4の延伸方向に直交する方向を導圧孔11−2d1の孔形状の幅方向とした場合、導圧孔11−2d1の孔形状の幅方向の長さ(以下、単に孔形状の幅という。)Wは25μm、導圧孔11−2d1の孔形状の径方向の長さ(以下、単に孔形状の長さという。)Lは300μmとされている。なお、図2には、導圧孔11−2dの孔形状に対して、この孔形状に外接する円を仮想的に1点鎖線で示している。   In the hole shape of the pressure guiding hole 11-2d1, the extending direction of the extending portions H1 to H4 is the radial direction of the hole shape of the guiding hole 11-2d1, and the direction orthogonal to the extending direction of the extending portions H1 to H4 is the guiding hole. When the width direction of the hole shape of 11-2d1 is taken, the length in the width direction of the pressure guide hole 11-2d1 (hereinafter simply referred to as the hole shape width) W is 25 μm, and the pressure guide hole 11-2d1 The length of the hole shape in the radial direction (hereinafter simply referred to as the length of the hole shape) L is 300 μm. In FIG. 2, a circle circumscribing the hole shape of the pressure guiding hole 11-2d is virtually indicated by a one-dot chain line.

この導圧孔11−2d1の孔形状において、導圧孔11−2d1の中心部分H0を導圧孔11−2d1の孔形状の幅Wと等しい直径Rの円(中心円)と考えた場合(R=W)、この中心部分H0の外縁から連続して四方に延びた延伸部分H1〜H4は、直径Rの円の外周の180゜の円弧を外縁の一部として延びた形とされていると言える。この場合、延伸部分H1〜H4の幅、すなわち導圧孔11−2d1の孔形状の幅Wは、中心部分H0の外縁の幅(中心円の直径R)と等しい(W=R)。   In the hole shape of the pressure guiding hole 11-2d1, when the central portion H0 of the pressure guiding hole 11-2d1 is considered as a circle (center circle) having a diameter R equal to the width W of the hole shape of the pressure guiding hole 11-2d1 ( R = W), the extending portions H1 to H4 extending continuously in four directions from the outer edge of the central portion H0 have a shape extending as a part of the outer edge of a 180 ° arc on the outer periphery of the circle having the diameter R. It can be said. In this case, the width of the extending portions H1 to H4, that is, the width W of the hole shape of the pressure guiding hole 11-2d1, is equal to the width of the outer edge of the central portion H0 (the diameter R of the central circle) (W = R).

図3に、この導圧孔11−2d1の孔形状と、図21に示した小径の孔径φ2(φ2=25μm)とした導圧孔11−2b’の孔形状との比較を示す。この比較から分かるように、本実施の形態の圧力センサチップ11Aにおいて、ストッパ部材11−2に形成されている導圧孔11−2d1は、導圧孔11−2b’の孔径φ2と等しい中心部分H0に加え、この孔径φ2と同幅で伸びた延伸部分H1〜H4を有している。   FIG. 3 shows a comparison between the hole shape of the pressure guide hole 11-2d1 and the hole shape of the pressure guide hole 11-2b ′ having the small diameter φ2 (φ2 = 25 μm) shown in FIG. As can be seen from this comparison, in the pressure sensor chip 11A of the present embodiment, the pressure guiding hole 11-2d1 formed in the stopper member 11-2 is a central portion equal to the hole diameter φ2 of the pressure guiding hole 11-2b ′. In addition to H0, it has stretched portions H1 to H4 extending with the same width as the hole diameter φ2.

この圧力センサチップ11Aにおいて、測定圧P1を高圧側の測定圧とし、測定圧P2を低圧側の測定圧とした場合、センサダイアフラム11−1の他方の面11−1bに高圧側の測定圧P1がかかると、センサダイアフラム11−1はストッパ部材11−2側に撓み、ストッパ部材11−2の曲面状の凹部11−2aに着底する。   In the pressure sensor chip 11A, when the measurement pressure P1 is the high-pressure measurement pressure and the measurement pressure P2 is the low-pressure measurement pressure, the high-pressure measurement pressure P1 is applied to the other surface 11-1b of the sensor diaphragm 11-1. As a result, the sensor diaphragm 11-1 bends to the stopper member 11-2 side and reaches the bottom of the curved concave portion 11-2a of the stopper member 11-2.

このストッパ部材11−2の曲面状の凹部11−2aには導圧孔11−2d1が開口している。このストッパ部材11−2の導圧孔11−2d1の孔形状は、図2に示されるように、幅W=25μm、長さL=300μmの十字形とされ、導圧孔11−2d1の中心に位置する中心部分H0と、この中心部分H0の外縁から連続して四方に延びた延伸部分H1〜H4とから構成されている。   A pressure guide hole 11-2d1 is opened in the curved concave portion 11-2a of the stopper member 11-2. As shown in FIG. 2, the hole shape of the pressure guide hole 11-2d1 of the stopper member 11-2 is a cross shape having a width W = 25 μm and a length L = 300 μm, and the center of the pressure guide hole 11-2d1. The central portion H0 is located at the center, and the extending portions H1 to H4 are continuously extended in four directions from the outer edge of the central portion H0.

この導圧孔11−2d1の孔形状において、幅Wは耐圧に寄与し、幅Wを小さくすることによって耐圧が高められる。これに対し、長さLは応答性と加工性に寄与し、長さLを大きくすることによって応答性と加工性が高められる。   In the hole shape of the pressure guiding hole 11-2d1, the width W contributes to the pressure resistance, and the pressure resistance is increased by reducing the width W. On the other hand, the length L contributes to responsiveness and workability, and by increasing the length L, the responsiveness and workability are enhanced.

すなわち、この導圧孔11−2d1の孔形状において、その幅Wは図23に示した導圧孔11−2b’の孔径φ2と同じ25μmとされているので、孔径φ2の導圧孔11−2b’を設けた場合と同程度の耐圧が得られる。また、中心部分H0に延伸部分H1〜H4が加わることにより、低圧側の測定圧P2の受圧面積が増え、応答速度の劣化が緩和される。また、アスペクト比(孔の深さ/孔の径)が低くなり、導圧孔11−2d1を作り易くなる。   That is, in the hole shape of the pressure guiding hole 11-2d1, its width W is 25 μm, which is the same as the hole diameter φ2 of the pressure guiding hole 11-2b ′ shown in FIG. A breakdown voltage comparable to that obtained when 2b ′ is provided is obtained. Further, by adding the extending portions H1 to H4 to the central portion H0, the pressure receiving area of the measurement pressure P2 on the low pressure side is increased, and the deterioration of the response speed is alleviated. Further, the aspect ratio (hole depth / hole diameter) becomes low, and the pressure guide hole 11-2d1 can be easily formed.

このようにして、本実施の形態の圧力センサチップ11Aでは、ストッパ部材11−2の曲面状の凹部11−2aに開口する導圧孔11−2d1の孔形状の幅Wを小さくすることにより耐圧が高められ、長さLを大きくすることにより応答性と加工性が高められるものとなり、加工性、応答速度の劣化を緩和、抑制しつつ、飛躍的な耐圧向上を達成することができるようになる。   In this manner, in the pressure sensor chip 11A of the present embodiment, the pressure resistance is reduced by reducing the hole-shaped width W of the pressure guide hole 11-2d1 opening in the curved recess 11-2a of the stopper member 11-2. So that responsiveness and workability can be improved by increasing the length L, and a dramatic improvement in pressure resistance can be achieved while mitigating and suppressing deterioration of workability and response speed. Become.

なお、上述においては、導圧孔11−2d1の中心部分H0を導圧孔11−2d1の孔形状の幅Wと等しい直径Rの円と考えたが、延伸部分H1〜H4の角部に接する直径Rの円(中心円)を導圧孔11−2d1の中心部分H0と考えることもできる(図4参照)。この場合、中心部分H0の外縁から連続して四方に伸びる延伸部分H1〜H4は、直径Rの円の外周の90゜の円弧を外縁の一部として伸びた形とされていると言える。この場合、延伸部分H1〜H4の幅、すなわち導圧孔11−2d1の孔形状の幅Wは、中心部分H0の外縁の幅(中心円の直径R)よりも小さい(W<R)。   In the above description, the central portion H0 of the pressure guiding hole 11-2d1 is considered as a circle having a diameter R equal to the width W of the hole shape of the pressure guiding hole 11-2d1, but is in contact with the corners of the extending portions H1 to H4. A circle having a diameter R (center circle) can also be considered as the central portion H0 of the pressure guide hole 11-2d1 (see FIG. 4). In this case, it can be said that the extending portions H1 to H4 extending continuously in four directions from the outer edge of the central portion H0 are formed so that a 90 ° arc on the outer periphery of a circle having a diameter R extends as a part of the outer edge. In this case, the width of the extending portions H1 to H4, that is, the width W of the hole shape of the pressure guiding hole 11-2d1, is smaller than the width of the outer edge of the central portion H0 (the diameter R of the central circle) (W <R).

また、上述においては、導圧孔11−2d1の中心部分H0を直径Rの円と考えたが、導圧孔11−2d1の中心部分H0を一辺の長さがWの正方形と考えることもできる(図5参照)。この場合、中心部分H0の外縁から連続して四方に伸びる延伸部分H1〜H4は、一辺の長さがWの正方形の辺を外縁の一部として延びた形とされていると言える。この場合、延伸部分H1〜H4の幅、すなわち導圧孔11−2d1の孔形状の幅Wは、中心部分H0の外縁の幅(正方形の一辺の長さW)と等しい。   In the above description, the central portion H0 of the pressure guiding hole 11-2d1 is considered as a circle having a diameter R. However, the central portion H0 of the pressure guiding hole 11-2d1 can also be considered as a square having a side length of W. (See FIG. 5). In this case, it can be said that the extending portions H1 to H4 extending continuously in four directions from the outer edge of the central portion H0 are formed in such a manner that a square side having a side length of W extends as a part of the outer edge. In this case, the width of the extending portions H1 to H4, that is, the width W of the hole shape of the pressure guiding hole 11-2d1, is equal to the width of the outer edge of the central portion H0 (the length W of one side of the square).

また、この圧力センサ11Aでは、導圧孔11−2dの孔形状を十字形としたが、図6に示すようなY字形の孔形状としてもよい。このY字形の孔形状とした導圧孔11−2d(11−2d2)において、導圧孔11−2d2の中心部分H0を延伸部分H1〜H3の角部に接する直径Rの円(中心円)と考えた場合、この中心部分H0の外縁から連続して三方に延びた延伸部分H1〜H3は、直径Rの円の外周の120゜の円弧を外縁の一部として延びた形とされていると言える。この場合、延伸部分H1〜H3の幅、すなわち導圧孔11−2d2の孔形状の幅Wは、中心部分H0の外縁の幅(中心円の直径R)よりも小さい(W<R)。   In this pressure sensor 11A, the hole shape of the pressure guide hole 11-2d is a cross shape, but it may be a Y-shaped hole shape as shown in FIG. In the Y-shaped pressure guide hole 11-2d (11-2d2), a circle (center circle) having a diameter R contacting the central portion H0 of the pressure guide hole 11-2d2 with the corners of the extended portions H1 to H3. In this case, the extending portions H1 to H3 continuously extending in three directions from the outer edge of the central portion H0 are formed so that a 120 ° arc on the outer periphery of a circle having a diameter R extends as a part of the outer edge. It can be said. In this case, the width of the extending portions H1 to H3, that is, the width W of the hole shape of the pressure guiding hole 11-2d2 is smaller than the width of the outer edge of the central portion H0 (the diameter R of the central circle) (W <R).

また、Y字形の孔形状の導圧孔11−2d2とした場合、その中心部分H0を一辺の長さがWの正三角形と考えることもできる(図7参照)。この場合、中心部分H0の外縁から連続して三方に伸びる延伸部分H1〜H3は、一辺の長さがWの正三角形の辺を外縁の一部として延びた形とされていると言える。この場合、延伸部分H1〜H3の幅、すなわち導圧孔11−2d2の孔形状の幅Wは、中心部分H0の外縁の幅(正三角形の一辺の長さW)と等しい。   Moreover, when it is set as the Y-shaped hole-shaped pressure guide hole 11-2d2, the center portion H0 can be considered as an equilateral triangle having a side length of W (see FIG. 7). In this case, it can be said that the extending portions H1 to H3 extending continuously in three directions from the outer edge of the central portion H0 have a shape in which a side of an equilateral triangle whose one side is W extends as a part of the outer edge. In this case, the width of the extending portions H1 to H3, that is, the width W of the hole shape of the pressure guiding hole 11-2d2, is equal to the width of the outer edge of the central portion H0 (the length W of one side of the equilateral triangle).

また、上述においては、導圧孔11−2d1の孔形状における延伸部分H1〜H4の幅を延伸方向の始端から終端まで同じ幅としたが、図8に示す導圧孔11−2(11−2d3)のように、延伸方向の始端から終端に向かって細くするようにしてもよい。この導圧孔11−2d3において、その中心部分H0を直径Rの円(中心円)と考えた場合、この中心部分H0の外縁から連続して四方に延びた延伸部分H1〜H4は、その最大幅が中心部分H0の外縁の幅(中心円の直径R)以下とされている。   In the above description, the width of the extending portions H1 to H4 in the hole shape of the pressure guiding hole 11-2d1 is the same width from the start end to the end in the stretching direction, but the pressure guiding hole 11-2 (11− shown in FIG. As in 2d3), it may be made narrower from the beginning to the end in the stretching direction. In the pressure guiding hole 11-2d3, when the central portion H0 is considered to be a circle having a diameter R (central circle), the extended portions H1 to H4 continuously extending from the outer edge of the central portion H0 are The width is substantially equal to or smaller than the width of the outer edge of the central portion H0 (the diameter R of the central circle).

また、図2に示した導圧孔11−2d1では中心部分H0に対して4つの延伸部分H1〜H4を、図6に示した導圧孔11−2d2では中心部分H0に対して3つの延伸部分H1〜H3を設けたが、中心部分H0に対する延伸部分は1つ以上あればよい。また、中心部分H0の形状は、上述したように考え方で異なるが、また、延伸部分の形状も種々考えられるが、延伸部分が中心部分H0の外縁の一部から連続して延びること、延伸部分の幅の最大幅が中心部分H0の外縁の幅以下であることを条件とし、この条件を満足すれば、どのような形状であっても構わない。   Further, in the pressure guiding hole 11-2d1 shown in FIG. 2, four extending portions H1 to H4 are formed with respect to the central portion H0, and in the pressure guiding hole 11-2d2 shown in FIG. 6, three extending portions are formed with respect to the central portion H0. Although the portions H1 to H3 are provided, it is sufficient that there is one or more extending portions with respect to the central portion H0. Further, the shape of the central portion H0 differs depending on the concept as described above, and various shapes of the extended portion are also conceivable. However, the extended portion continuously extends from a part of the outer edge of the central portion H0, and the extended portion. As long as the maximum width is equal to or less than the width of the outer edge of the central portion H0, any shape can be used as long as this condition is satisfied.

〔実施の形態2〕
上述した実施の形態1では、測定圧P1を高圧側の測定圧とし、測定圧P2を低圧側の測定圧とした。センサダイアフラム11−1上で高圧側の測定圧を受ける面が必ず決まっている場合には、図1に示されるように、センサダイアフラム11−1の他方の面11−1bを高圧側の測定圧P1の受圧面とし、一方の面11−1aを低圧側の測定圧P2の受圧面とする。
[Embodiment 2]
In the first embodiment described above, the measurement pressure P1 is the high-pressure side measurement pressure, and the measurement pressure P2 is the low-pressure side measurement pressure. When the surface on the sensor diaphragm 11-1 that receives the high pressure side measurement pressure is always determined, as shown in FIG. 1, the other surface 11-1b of the sensor diaphragm 11-1 is connected to the high pressure side measurement pressure. The pressure receiving surface is P1, and one surface 11-1a is the pressure receiving surface of the low-pressure measurement pressure P2.

これに対し、センサダイアフラム11−1上で高圧側の測定圧を受ける面が決まっていないような場合には、図9に実施の形態2の圧力センサチップ11Bとして示すように、ストッパ部材11−3の曲面状の凹部11−3aの頂部に形成する導圧孔11−3dについても、ストッパ部材11−2側の導圧孔11−2dと同様の孔形状とする。   On the other hand, when the surface that receives the high-pressure measurement pressure is not determined on the sensor diaphragm 11-1, as shown as the pressure sensor chip 11B of the second embodiment in FIG. 9, the stopper member 11- Also, the pressure guiding hole 11-3d formed at the top of the third curved concave portion 11-3a has the same shape as the pressure guiding hole 11-2d on the stopper member 11-2 side.

この圧力センサチップ11Bにおいて、測定圧P1を低圧側の測定圧とし、測定圧P2を高圧側の測定圧とした場合、センサダイアフラム11−1の一方の面11−1aに高圧側の測定圧P2がかかると、センサダイアフラム11−1はストッパ部材11−3側に撓み、ストッパ部材11−3の曲面状の凹部11−3aに着底する。このストッパ部材11−3の曲面状の凹部11−3aには、ストッパ部材11−2側の導圧孔11−2dと同様の孔形状の導圧孔11−3dが開口している。   In the pressure sensor chip 11B, when the measurement pressure P1 is the low-pressure measurement pressure and the measurement pressure P2 is the high-pressure measurement pressure, the high-pressure measurement pressure P2 is applied to one surface 11-1a of the sensor diaphragm 11-1. As a result, the sensor diaphragm 11-1 bends toward the stopper member 11-3 and settles in the curved concave portion 11-3a of the stopper member 11-3. In the curved concave portion 11-3a of the stopper member 11-3, a hole-shaped pressure guiding hole 11-3d similar to the pressure guiding hole 11-2d on the stopper member 11-2 side is opened.

これにより、ストッパ部材11−2側の導圧孔11−2dと同様にして、ストッパ部材11−3側の導圧孔11−3dにおいても、ストッパ部材11−3の曲面状の凹部11−3aに開口する導圧孔11−3dの孔形状の幅Wを小さくすることによって耐圧が高められ、長さLを大きくすることによって応答性と加工性が高められるものとなる。   Thus, similarly to the pressure guide hole 11-2d on the stopper member 11-2 side, the curved concave portion 11-3a of the stopper member 11-3 also on the pressure guide hole 11-3d on the stopper member 11-3 side. The pressure resistance is increased by reducing the width W of the hole shape of the pressure guide hole 11-3d that is open to the surface, and the responsiveness and workability are increased by increasing the length L.

〔実施の形態3〕
図10に実施の形態3の圧力センサチップ11Cを示す。この圧力センサチップ11Cにおいて、ストッパ部材11−2の曲面状の凹部11−2aの底面上には、 複数の凸部(柱)12が離散的に形成されており(図11参照)、この複数の凸部12と凸部12との間の通路(溝)13が導圧孔11−2dの周部とストッパ部材11−2の曲面状の凹部11−2aの周端部14との間の連通路とされている。この例において、凸部12は円柱状とされているが、図12に示すように、六角柱状とするなどしてもよい。
[Embodiment 3]
FIG. 10 shows a pressure sensor chip 11C according to the third embodiment. In the pressure sensor chip 11C, a plurality of convex portions (columns) 12 are discretely formed on the bottom surface of the curved concave portion 11-2a of the stopper member 11-2 (see FIG. 11). The passage (groove) 13 between the convex portion 12 and the convex portion 12 is between the peripheral portion of the pressure guide hole 11-2d and the peripheral end portion 14 of the curved concave portion 11-2a of the stopper member 11-2. It is a communication path. In this example, the convex portion 12 has a cylindrical shape, but may have a hexagonal column shape as shown in FIG.

凸部12を円柱状とする場合には、図11に示すように、曲面状の凹部11−2aの頂部(凸部12と凸部12との間の通路13上)に、十字形の孔形状の導圧孔11−2d1を開口させる。凸部12を六角柱状とする場合には、図12に示すように、曲面状の凹部11−2aの頂部(凸部12と凸部12との間の通路13上)に、Y字形の孔形状の導圧孔11−2d2を開口させる。   When the convex portion 12 has a cylindrical shape, as shown in FIG. 11, a cross-shaped hole is formed at the top of the curved concave portion 11-2a (on the passage 13 between the convex portion 12 and the convex portion 12). The shaped pressure guide hole 11-2d1 is opened. When the convex portion 12 has a hexagonal column shape, as shown in FIG. 12, a Y-shaped hole is formed on the top of the curved concave portion 11-2a (on the passage 13 between the convex portion 12 and the convex portion 12). The shaped pressure guide hole 11-2d2 is opened.

この圧力センサチップ11Cにおいて、測定圧P1を高圧側の測定圧とし、測定圧P2を低圧側の測定圧とした場合、センサダイアフラム11−1の他方の面11−1bに高圧側の測定圧P1がかかると、センサダイアフラム11−1はストッパ部材11−2側に撓み、ストッパ部材11−2の曲面状の凹部11−2aに着底する。   In this pressure sensor chip 11C, when the measurement pressure P1 is the high-pressure measurement pressure and the measurement pressure P2 is the low-pressure measurement pressure, the high-pressure measurement pressure P1 is applied to the other surface 11-1b of the sensor diaphragm 11-1. As a result, the sensor diaphragm 11-1 bends to the stopper member 11-2 side and reaches the bottom of the curved concave portion 11-2a of the stopper member 11-2.

このセンサダイアフラム11−1が着底するストッパ部材11−2の曲面状の凹部11−2aには、複数の凸部12が離散的に形成されており、この複数の凸部12と凸部12との間の通路13が導圧孔11−2dの周部とストッパ部材11−2の曲面状の凹部11−2aの周端部14との間の連通路とされている。   A plurality of convex portions 12 are discretely formed in the curved concave portion 11-2a of the stopper member 11-2 on which the sensor diaphragm 11-1 bottoms, and the plurality of convex portions 12 and the convex portions 12 are formed. Is a communication path between the peripheral portion of the pressure guide hole 11-2d and the peripheral end portion 14 of the curved concave portion 11-2a of the stopper member 11-2.

このストッパ部材11−2の曲面状の凹部11−2に形成された複数の凸部12は、センサダイアフラム11−1が変位して当該センサダイアフラム11−1がその凸部12の上面に接触した状態でも、導圧孔11−2dの周部とストッパ部材11−2の曲面状の凹部11−2aの周端部14との間の連通状態を保つ。   In the plurality of convex portions 12 formed in the curved concave portion 11-2 of the stopper member 11-2, the sensor diaphragm 11-1 is displaced and the sensor diaphragm 11-1 contacts the upper surface of the convex portion 12. Even in the state, the communication state between the peripheral portion of the pressure guiding hole 11-2d and the peripheral end portion 14 of the curved concave portion 11-2a of the stopper member 11-2 is maintained.

この圧力センサチップ11Cでは、連通状態が保たれる複数の凸部12と凸部12との間の通路13が圧力伝達媒体として封入されているオイルの逃げ道となるため、センサダイアフラム11−1とストッパ部材11−2の曲面状の凹部11−2aとの間にオイルが取り残されることによるセンサダイアフラム11−1の異常変形を回避することが可能となる。   In this pressure sensor chip 11C, the passages 13 between the plurality of convex portions 12 and the convex portions 12 that are kept in communication with each other serve as escape routes for the oil sealed as the pressure transmission medium, so that the sensor diaphragm 11-1 Abnormal deformation of the sensor diaphragm 11-1 due to oil remaining between the curved concave portion 11-2a of the stopper member 11-2 can be avoided.

また、センサダイアフラム11−1へ測定圧P2を導く導圧孔11−2dだけではなく、曲面状の凹部11−2aの底面全体に形成される複数の凸部12と凸部12との間の通路13にオイルが残るため、センサダイアフラム11−1の剥離性が向上する。また、曲面状の凹部11−2aの底面全体に形成される複数の凸部12と凸部12との間の通路13を通してセンサダイアフラム11−1のエッジ付近(微少ギャップ付近)までオイルを侵入させることが可能となるため、オイルの封入性が向上する。   Further, not only between the pressure guide hole 11-2d for guiding the measurement pressure P2 to the sensor diaphragm 11-1, but also between the plurality of convex portions 12 formed on the entire bottom surface of the curved concave portion 11-2a. Since oil remains in the passage 13, the peelability of the sensor diaphragm 11-1 is improved. Further, the oil is caused to enter the vicinity of the edge of the sensor diaphragm 11-1 (near the small gap) through the passage 13 between the plurality of convex portions 12 formed on the entire bottom surface of the curved concave portion 11-2a. Therefore, the oil sealing property is improved.

なお、この圧力センサチップ11Cでは、曲面状の凹部11−2aの頂部にのみ導圧孔11−2dを形成するようにしたが、曲面状の凹部11−2aの頂部以外の位置にも同様の導圧孔11−2dを形成するようにしてもよい。この場合、他の導圧孔11−2dも曲面状の凹部11−2aの頂部に形成する導圧孔11−2dと同様、凸部12と凸部12との間の通路13上に開口させるようにする。図13に凸部12を円柱状とした曲面状の凹部11−2aに十字形の孔形状とした複数の導圧孔11−2d1を形成した例を示す。図14に凸部12を六角柱状とした曲面状の凹部11−2aにY字形の孔形状とした複数の導圧孔11−2d2を形成した例を示す。   In this pressure sensor chip 11C, the pressure guide hole 11-2d is formed only at the top of the curved concave portion 11-2a, but the same applies to positions other than the top of the curved concave portion 11-2a. The pressure guiding hole 11-2d may be formed. In this case, the other pressure guiding holes 11-2d are also opened on the passages 13 between the convex portions 12 as in the case of the pressure guiding holes 11-2d formed at the tops of the curved concave portions 11-2a. Like that. FIG. 13 shows an example in which a plurality of pressure guiding holes 11-2d1 having a cruciform hole shape are formed in a curved concave portion 11-2a in which the convex portion 12 has a cylindrical shape. FIG. 14 shows an example in which a plurality of pressure guiding holes 11-2d2 having a Y-shaped hole shape are formed in a curved concave portion 11-2a in which the convex portion 12 has a hexagonal column shape.

〔実施の形態4〕
上述した実施の形態3では、測定圧P1を高圧側の測定圧とし、測定圧P2を低圧側の測定圧とした。センサダイアフラム11−1上で高圧側の測定圧を受ける面が必ず決まっている場合には、図10に示されるように、センサダイアフラム11−1の他方の面11−1bを高圧側の測定圧P1の受圧面とし、一方の面11−1aを低圧側の測定圧P2の受圧面とする。
[Embodiment 4]
In Embodiment 3 described above, the measurement pressure P1 is the high-pressure side measurement pressure, and the measurement pressure P2 is the low-pressure side measurement pressure. If the surface on the sensor diaphragm 11-1 that receives the high pressure side measurement pressure is always determined, as shown in FIG. 10, the other surface 11-1b of the sensor diaphragm 11-1 is connected to the high pressure side measurement pressure. The pressure receiving surface is P1, and one surface 11-1a is the pressure receiving surface of the low-pressure measurement pressure P2.

これに対し、センサダイアフラム11−1上で高圧側の測定圧を受ける面が決まっていないような場合には、図15に実施の形態4の圧力センサチップ11Dとして示すように、ストッパ部材11−3の曲面状の凹部11−3aの底面上にも、 ストッパ部材11−2の曲面状の凹部11−3aと同様にして、複数の凸部(柱)12を離散的に形成し、この複数の凸部12と凸部12との間の通路(溝)13を導圧孔11−3dの周部とストッパ部材11−3の曲面状の凹部11−3aの周端部14との間の連通路とする。   On the other hand, when the surface that receives the high-pressure measurement pressure is not determined on the sensor diaphragm 11-1, the stopper member 11- is shown in FIG. 15 as the pressure sensor chip 11D of the fourth embodiment. The plurality of convex portions (columns) 12 are also discretely formed on the bottom surface of the third curved concave portion 11-3a in the same manner as the curved concave portion 11-3a of the stopper member 11-2. A passage (groove) 13 between the convex portion 12 and the convex portion 12 is formed between the peripheral portion of the pressure guide hole 11-3d and the peripheral end portion 14 of the curved concave portion 11-3a of the stopper member 11-3. Use a communication path.

また、凸部12を円柱状とする場合には、図16に示すように、曲面状の凹部11−3aの頂部(凸部12と凸部12との間の通路13上)に、十字形の孔形状の導圧孔11−3d1を開口させる。凸部12六角柱状とする場合には、図17に示すように、曲面状の凹部11−3aの頂部(凸部12と凸部12との間の通路13上)に、Y字形の孔形状の導圧孔11−3d2を開口させる。   Moreover, when the convex part 12 is made into a column shape, as shown in FIG. 16, a cross shape is formed on the top of the curved concave part 11-3a (on the passage 13 between the convex part 12 and the convex part 12). The hole-shaped pressure guide hole 11-3d1 is opened. In the case where the convex portion 12 has a hexagonal column shape, as shown in FIG. 17, a Y-shaped hole shape is formed at the top of the curved concave portion 11-3a (on the passage 13 between the convex portion 12 and the convex portion 12). The pressure guiding hole 11-3d2 is opened.

この圧力センサチップ11Dにおいて、測定圧P1を低圧側の測定圧とし、測定圧P2を高圧側の測定圧とした場合、センサダイアフラム11−1の一方の面11−1aに高圧側の測定圧P2がかかると、センサダイアフラム11−1はストッパ部材11−3側に撓み、ストッパ部材11−3の曲面状の凹部11−3aに着底する。   In the pressure sensor chip 11D, when the measurement pressure P1 is a low-pressure measurement pressure and the measurement pressure P2 is a high-pressure measurement pressure, the high-pressure measurement pressure P2 is applied to one surface 11-1a of the sensor diaphragm 11-1. As a result, the sensor diaphragm 11-1 bends toward the stopper member 11-3 and settles in the curved concave portion 11-3a of the stopper member 11-3.

このセンサダイアフラム11−1が着底するストッパ部材11−3の曲面状の凹部11−3aには、複数の凸部12が離散的に形成されており、この複数の凸部12と凸部12との間の通路13が導圧孔11−3dの周部とストッパ部材11−3の曲面状の凹部11−3aの周端部14との間の連通路とされている。このストッパ部材11−3の曲面状の凹部11−3に形成された複数の凸部12は、センサダイアフラム11−1が変位して当該センサダイアフラム11−1がその凸部12の上面に接触した状態でも、導圧孔11−3dの周部とストッパ部材11−3の曲面状の凹部11−3aの周端部14との間の連通状態を保つ。   A plurality of convex portions 12 are discretely formed in the curved concave portion 11-3a of the stopper member 11-3 on which the sensor diaphragm 11-1 bottoms, and the plurality of convex portions 12 and the convex portions 12 are formed. Is a communication path between the peripheral portion of the pressure guide hole 11-3d and the peripheral end portion 14 of the curved concave portion 11-3a of the stopper member 11-3. In the plurality of convex portions 12 formed in the curved concave portion 11-3 of the stopper member 11-3, the sensor diaphragm 11-1 is displaced and the sensor diaphragm 11-1 contacts the upper surface of the convex portion 12. Even in the state, the communication state between the peripheral portion of the pressure guide hole 11-3d and the peripheral end portion 14 of the curved concave portion 11-3a of the stopper member 11-3 is maintained.

この圧力センサチップ11Dでも、圧力センサチップ11Cと同様、連通状態が保たれる複数の凸部12と凸部12との間の通路13が圧力伝達媒体として封入されているオイルの逃げ道となるため、センサダイアフラム11−1とストッパ部材11−3の曲面状の凹部11−3aとの間にオイルが取り残されることによるセンサダイアフラム11−1の異常変形を回避することが可能となる。   Also in this pressure sensor chip 11D, as in the case of the pressure sensor chip 11C, the passages 13 between the plurality of convex portions 12 and the convex portions 12 that are kept in communication are escape routes for oil sealed as a pressure transmission medium. It is possible to avoid abnormal deformation of the sensor diaphragm 11-1 due to oil remaining between the sensor diaphragm 11-1 and the curved concave portion 11-3a of the stopper member 11-3.

また、センサダイアフラム11−1へ測定圧P1を導く導圧孔11−3dだけではなく、曲面状の凹部11−3aの底面全体に形成される複数の凸部12と凸部12との間の通路13にオイルが残るため、センサダイアフラム11−1の剥離性が向上する。また、曲面状の凹部11−3aの底面全体に形成される複数の凸部12と凸部12との間の通路13を通してセンサダイアフラム11−1のエッジ付近(微少ギャップ付近)までオイルを侵入させることが可能となるため、オイルの封入性が向上する。   Further, not only between the pressure guiding hole 11-3d for guiding the measurement pressure P1 to the sensor diaphragm 11-1, but also between the plurality of convex portions 12 formed on the entire bottom surface of the curved concave portion 11-3a. Since oil remains in the passage 13, the peelability of the sensor diaphragm 11-1 is improved. Further, the oil is allowed to enter the vicinity of the edge of the sensor diaphragm 11-1 (near the minute gap) through the passage 13 between the plurality of convex portions 12 formed on the entire bottom surface of the curved concave portion 11-3a. Therefore, the oil sealing property is improved.

このように、この圧力センサチップ11Dでは、センサダイアフラム11−1のどちらの面が高圧側の測定圧の受圧面となっても、その底面上に複数の凸部12が離散的に形成されているストッパ部材11−2,11−3の凹部11−2a,11−3aにセンサダイアフラム11−1を着底させるようにすることができ、複数の凸部12と凸部12との間の通路13をオイルの逃げ道として、センサダイアフラム11−1の異常変形を回避することが可能となる。また、センサダイアフラム11−1のとちらの面でも、センサダイアフラム11−1の剥離性や圧力伝達媒体の封入性を向上させることが可能となる。   As described above, in this pressure sensor chip 11D, the plurality of convex portions 12 are discretely formed on the bottom surface of whichever surface of the sensor diaphragm 11-1 serves as the pressure receiving surface for the high-pressure measurement pressure. The sensor diaphragm 11-1 can be made to bottom in the recesses 11-2a and 11-3a of the stopper members 11-2 and 11-3, and a path between the plurality of projections 12 and the projections 12 can be provided. It is possible to avoid abnormal deformation of the sensor diaphragm 11-1 by using 13 as an oil escape path. Further, it is possible to improve the peelability of the sensor diaphragm 11-1 and the sealing property of the pressure transmission medium also on the other side of the sensor diaphragm 11-1.

なお、この圧力センサチップ11Dにおいても、曲面状の凹部11−3aの頂部以外の位置にも同様の導圧孔11−3dを形成するようにしてもよい。この場合、他の導圧孔11−3dも曲面状の凹部11−3aの頂部に形成する導圧孔11−3dと同様、凸部12と凸部12との間の通路13上に開口させるようにすることは言うまでもない。   In the pressure sensor chip 11D, a similar pressure guide hole 11-3d may be formed at a position other than the top of the curved concave portion 11-3a. In this case, the other pressure guiding holes 11-3d are also opened on the passages 13 between the convex portions 12 similarly to the pressure guiding holes 11-3d formed at the top of the curved concave portions 11-3a. Needless to say.

〔実施の形態5〕
図18に実施の形態5の圧力センサチップ11Eを示す。この圧力センサチップ11Eにおいて、ストッパ部材11−2の周縁部11−2cは、センサダイアフラム11−1の一方の面11−1aと対面する領域S1のうち、外周側の領域S1aがセンサダイアフラム11−1の一方の面11−1aとの接合領域とされ、内周側の領域S1bがセンサダイアフラム11−1の一方の面11−1aとの非接合領域とされている。また、ストッパ部材11−3の周縁部11−3cは、センサダイアフラム11−1の他方の面11−1bと対面する領域S2のうち、外周側の領域S2aがセンサダイアフラム11−1の他方の面11−1bとの接合領域とされ、内周側の領域S2bがセンサダイアフラム11−1の他方の面11−1bとの非接合領域とされている。
[Embodiment 5]
FIG. 18 shows a pressure sensor chip 11E of the fifth embodiment. In the pressure sensor chip 11E, the peripheral edge portion 11-2c of the stopper member 11-2 has a region S1a on the outer peripheral side out of the region S1 facing the one surface 11-1a of the sensor diaphragm 11-1, and the sensor diaphragm 11-. 1 is a joining region with one surface 11-1a, and an inner peripheral region S1b is a non-joining region with one surface 11-1a of the sensor diaphragm 11-1. In addition, the peripheral portion 11-3c of the stopper member 11-3 has a region S2a on the outer peripheral side of the region S2 facing the other surface 11-1b of the sensor diaphragm 11-1, and the other surface of the sensor diaphragm 11-1. The region S2b on the inner peripheral side is a non-bonded region with the other surface 11-1b of the sensor diaphragm 11-1.

ストッパ部材11−2の周縁部11−2cの外周側の領域S1aは、センサダイアフラム11−1の一方の面11−1aに直接接合されることによって接合領域とされ、ストッパ部材11−3の周縁部11−3cの外周側の領域S2aは、センサダイアフラム11−1の他方の面11−1bに直接接合されることによって接合領域とされている。以下、ストッパ部材11−2の周縁部11−2cの外周側の領域S1aを接合領域S1aと呼び、ストッパ部材11−3の周縁部11−3cの外周側の領域S2aを接合領域S2aと呼ぶ。   A region S1a on the outer peripheral side of the peripheral edge portion 11-2c of the stopper member 11-2 is directly bonded to one surface 11-1a of the sensor diaphragm 11-1 to be a bonding region, and the peripheral edge of the stopper member 11-3. The region S2a on the outer peripheral side of the portion 11-3c is a joining region by being directly joined to the other surface 11-1b of the sensor diaphragm 11-1. Hereinafter, the outer peripheral side region S1a of the peripheral portion 11-2c of the stopper member 11-2 is referred to as a joining region S1a, and the outer peripheral side region S2a of the peripheral portion 11-3c of the stopper member 11-3 is referred to as a joining region S2a.

ストッパ部材11−2の周縁部11−2cの内周側の領域S1bは、プラズマや薬液などにより表面を荒らすなどして、センサダイアフラム11−1の一方の面11−1aに接してはいるが、接合はされてない非接合領域とされている。ストッパ部材11−3の周縁部11−3cの内周側の領域S2bも、プラズマや薬液などにより表面を荒らすなどして、センサダイアフラム11−1の他方の面11−1bに接してはいるが、接合はされてない非接合領域とされている。以下、ストッパ部材11−2の周縁部11−2cの内周側の領域S1bを非接合領域S1bと呼び、ストッパ部材11−3の周縁部11−3cの内周側の領域S2bを非接合領域S2bと呼ぶ。   The region S1b on the inner peripheral side of the peripheral edge portion 11-2c of the stopper member 11-2 is in contact with one surface 11-1a of the sensor diaphragm 11-1 by roughening the surface with plasma or a chemical solution. The non-bonded region is not bonded. The region S2b on the inner peripheral side of the peripheral edge portion 11-3c of the stopper member 11-3 is also in contact with the other surface 11-1b of the sensor diaphragm 11-1 by roughening the surface with plasma or a chemical solution. The non-bonded region is not bonded. Hereinafter, the region S1b on the inner peripheral side of the peripheral portion 11-2c of the stopper member 11-2 is referred to as a non-joined region S1b, and the region S2b on the inner peripheral side of the peripheral portion 11-3c of the stopper member 11-3 is referred to as a non-joined region. Called S2b.

そして、センサダイアフラム11−1の下面の非接合領域S1bより更に内側がセンサダイアフラム11−1の感圧領域D1であり、同様に、センサダイアフラム11−1の上面の非接合領域S2bより更に内側がセンサダイアフラム11−1の感圧領域D2である。感圧領域D1ではストッパ部材11−2に対向する面に一方の測定圧P2がかかるとともに、感圧領域D2ではストッパ部材11−3に対向する面にもう一方の測定圧P1がかかる。なお、感圧領域D1及びD2の直径がセンサダイアフラム11−1の有効径である。   Further, the inner side of the non-bonded region S1b on the lower surface of the sensor diaphragm 11-1 is the pressure-sensitive region D1 of the sensor diaphragm 11-1, and similarly, the inner side of the non-bonded region S2b of the upper surface of the sensor diaphragm 11-1 is further on. This is the pressure sensitive region D2 of the sensor diaphragm 11-1. In the pressure sensitive region D1, one measured pressure P2 is applied to the surface facing the stopper member 11-2, and in the pressure sensitive region D2, the other measured pressure P1 is applied to the surface facing the stopper member 11-3. The diameters of the pressure sensitive regions D1 and D2 are the effective diameters of the sensor diaphragm 11-1.

この圧力センサチップ11Eにおいて、測定圧P1を高圧側の測定圧とし、測定圧P2を低圧側の測定圧とした場合、センサダイアフラム11−1の上面の感圧領域D2に高圧側の測定圧P1がかかると、センサダイアフラム11−1はストッパ部材11−2の周縁部11−2cとの非接合領域S1bでストッパ部材11−2から拘束による過渡な引っ張り応力が生じることなく撓むことができるので、この部分に生じる応力が低減されるものとなる。   In the pressure sensor chip 11E, when the measurement pressure P1 is the high-pressure measurement pressure and the measurement pressure P2 is the low-pressure measurement pressure, the high-pressure measurement pressure P1 is placed in the pressure-sensitive region D2 on the upper surface of the sensor diaphragm 11-1. Since the sensor diaphragm 11-1 can be bent without a transient tensile stress due to restraint from the stopper member 11-2 in the non-joining region S1b with the peripheral edge portion 11-2c of the stopper member 11-2. The stress generated in this part is reduced.

また、この圧力センサチップ11Eにおいて、測定圧P2を高圧側の測定圧とし、測定圧P1を低圧側の測定圧とした場合、センサダイアフラム11−1の下面の感圧領域D1に高圧側の測定圧P2がかかると、センサダイアフラム11−1はストッパ部材11−3の周縁部11−3cとの非接合領域S2bでストッパ部材11−3から拘束による過渡な引っ張り応力が生じることなく撓むことができるので、この部分に生じる応力が低減されるものとなる。   Further, in this pressure sensor chip 11E, when the measurement pressure P2 is the high-pressure measurement pressure and the measurement pressure P1 is the low-pressure measurement pressure, the high-pressure measurement is performed in the pressure sensitive region D1 on the lower surface of the sensor diaphragm 11-1. When the pressure P2 is applied, the sensor diaphragm 11-1 bends without any transient tensile stress due to restraint from the stopper member 11-3 in the non-joining region S2b with the peripheral portion 11-3c of the stopper member 11-3. Therefore, the stress generated in this portion is reduced.

このようにして、実施の形態5の圧力センサチップ11Eでは、実施の形態4の圧力センサチップ11Dの効果に加えて、センサダイアフラム11の拘束による応力発生を低減させ、期待される耐圧を確保することができるようになるという効果を奏する。更に、この圧力センサチップ11Eでは、ストッパ部材11−2,11−3の凹部11−2a,11−3aの開口サイズのズレによるセンサダイアフラム11−1の拘束箇所の位置ずれが解消されるため、これによる応力増加および着底異常による応力発生についても大幅に改善されるものとなる。   In this way, in the pressure sensor chip 11E of the fifth embodiment, in addition to the effects of the pressure sensor chip 11D of the fourth embodiment, the generation of stress due to the restraint of the sensor diaphragm 11 is reduced, and an expected breakdown voltage is ensured. There is an effect that it becomes possible. Further, in this pressure sensor chip 11E, the displacement of the restrained portion of the sensor diaphragm 11-1 due to the deviation of the opening sizes of the recesses 11-2a and 11-3a of the stopper members 11-2 and 11-3 is eliminated. As a result, the increase in stress and the generation of stress due to abnormal landing will be greatly improved.

なお、上述した実施の形態では、センサダイアフラム11−1を圧力変化に応じて抵抗値が変化する歪抵抗ゲージを形成したタイプとしているが、静電容量式のセンサチップとしてもよい。静電容量式のセンサチップは、所定の空間(容量室)を備えた基板と、その基板の空間上に配置されたダイアフラムと、基板に形成された固定電極と、ダイアフラムに形成された可動電極とを備えている。ダイアフラムが圧力を受けて変形することで、可動電極と固定電極との間隔が変化してその間の静電容量が変化する。   In the above-described embodiment, the sensor diaphragm 11-1 is a type in which a strain resistance gauge whose resistance value changes according to a pressure change is formed. However, a capacitive sensor chip may be used. A capacitance type sensor chip includes a substrate having a predetermined space (capacitance chamber), a diaphragm disposed in the space of the substrate, a fixed electrode formed on the substrate, and a movable electrode formed on the diaphragm. And. When the diaphragm is deformed by receiving pressure, the distance between the movable electrode and the fixed electrode changes, and the capacitance between them changes.

〔実施の形態の拡張〕
以上、実施の形態を参照して本発明を説明したが、本発明は上記実施の形態に限定されるものではない。本発明の構成や詳細には、本発明の技術思想の範囲内で当業者が理解し得る様々な変更をすることができる。また、各実施の形態については、矛盾しない範囲で任意に組み合わせて実施することができる。
[Extension of the embodiment]
The present invention has been described above with reference to the embodiment, but the present invention is not limited to the above embodiment. Various changes that can be understood by those skilled in the art can be made to the configuration and details of the present invention within the scope of the technical idea of the present invention. Each embodiment can be implemented in any combination within a consistent range.

本発明は、工業用の差圧センサに用いる圧力センサチップとして利用することができる。   The present invention can be used as a pressure sensor chip used for an industrial differential pressure sensor.

11A〜11D…圧力センサチップ、11−1…センサダイアフラム、11−1a…一方の面、11−2b…他方の面、11−2,11−3…ストッパ部材、11−2a,11−3a…凹部、11−2c,11−3c…周縁面、11−2d(11−2d1,11−2d2),11−3d(11−3d1,11−3d2)…圧力導入孔(導圧孔)、11−4,11−5…台座、11−4a,11−5a…圧力導入孔(導圧孔)、12…凸部(柱)、13…通路(溝)、14…周端部、H0…中心部分、H1〜H4…延伸部分。   11A to 11D ... Pressure sensor chip, 11-1 ... Sensor diaphragm, 11-1a ... One surface, 11-2b ... The other surface, 11-2, 11-3 ... Stopper member, 11-2a, 11-3a ... Recessed part, 11-2c, 11-3c ... peripheral surface, 11-2d (11-2d1, 11-2d2), 11-3d (11-3d1, 11-3d2) ... pressure introduction hole (pressure guide hole), 11- 4, 11-5: Pedestal, 11-4a, 11-5a: Pressure introducing hole (pressure introducing hole), 12: Convex portion (column), 13: Passage (groove), 14 ... Circumferential end, H0 ... Central portion , H1 to H4 ... stretched portions.

Claims (5)

圧力差に応じた信号を出力するセンサダイアフラムと、このセンサダイアフラムの一方の面および他方の面にその周縁部を対面させて接合され、前記センサダイアフラムへ測定圧を導く導圧孔を有する第1および第2の保持部材とを備えた圧力センサチップにおいて、
前記第1の保持部材は、
前記センサダイアフラムに過大圧が印加された時の当該センサダイアフラムの過度な変位を阻止するそのセンサダイアフラムの変位に沿った曲面状の凹部を備え、
前記第1の保持部材の導圧孔は、
前記第1の保持部材を貫いて前記第1の保持部材の曲面状の凹部に開口し、
前記第1の保持部材の導圧孔の前記第1の保持部材を貫く方向から見た孔形状は、
前記第1の保持部材の導圧孔の中心に位置する中心部分とこの中心部分の外縁の一部から連続して中心から外方向に延びた1つ以上の延伸部分とを備えた形状とされ、
前記第1の保持部材の導圧孔の孔形状の延伸部分の延伸方向に直交する方向の最大幅は、
前記第1の保持部材の導圧孔の孔形状の中心部分の外縁の幅以下とされている
ことを特徴とする圧力センサチップ。
A sensor diaphragm that outputs a signal corresponding to a pressure difference, and a first pressure-guiding hole that is joined to one surface and the other surface of the sensor diaphragm with their peripheral portions facing each other and guides a measurement pressure to the sensor diaphragm. And a pressure sensor chip comprising a second holding member,
The first holding member is
A curved concave portion along the displacement of the sensor diaphragm that prevents excessive displacement of the sensor diaphragm when an excessive pressure is applied to the sensor diaphragm;
The pressure introducing hole of the first holding member is
Penetrating through the first holding member and opening into the curved concave portion of the first holding member,
The hole shape of the pressure guiding hole of the first holding member viewed from the direction penetrating the first holding member is:
The first holding member has a shape including a central portion located at the center of the pressure guiding hole and one or more extending portions extending outward from the center continuously from a part of the outer edge of the central portion. ,
The maximum width of the first holding member in the direction perpendicular to the extending direction of the extending portion of the hole-shaped extending portion of the pressure introducing hole is:
The pressure sensor chip, wherein the width is equal to or less than the width of the outer edge of the hole-shaped center portion of the pressure guiding hole of the first holding member.
請求項1に記載された圧力センサチップにおいて、
前記第2の保持部材は、
前記センサダイアフラムに過大圧が印加された時の当該センサダイアフラムの過度な変位を阻止するそのセンサダイアフラムの変位に沿った曲面状の凹部を備え、
前記第2の保持部材の導圧孔は、
前記第2の保持部材を貫いて前記第2の保持部材の曲面状の凹部に開口し、
前記第2の保持部材の導圧孔の前記第2の保持部材を貫く方向から見た孔形状は、
前記第2の保持部材の導圧孔の中心に位置する中心部分とこの中心部分の外縁の一部から連続して中心から外方向に延びた1つ以上の延伸部分とから構成された形状とされ、
前記第2の保持部材の導圧孔の孔形状の延伸部分の延伸方向に直交する方向の最大幅は、
前記第2の保持部材の導圧孔の孔形状の中心部分の外縁の幅以下とされている
ことを特徴とする圧力センサチップ。
The pressure sensor chip according to claim 1,
The second holding member is
A curved concave portion along the displacement of the sensor diaphragm that prevents excessive displacement of the sensor diaphragm when an excessive pressure is applied to the sensor diaphragm;
The pressure introducing hole of the second holding member is
Penetrating through the second holding member and opening into the curved concave portion of the second holding member,
The hole shape of the pressure guiding hole of the second holding member viewed from the direction penetrating the second holding member is:
A shape composed of a central portion located at the center of the pressure guiding hole of the second holding member and one or more extending portions extending outward from the center continuously from a part of the outer edge of the central portion; And
The maximum width in the direction perpendicular to the extending direction of the hole-shaped extending portion of the pressure guiding hole of the second holding member is:
The pressure sensor chip, wherein the width is equal to or less than the width of the outer edge of the central portion of the hole-shaped central portion of the second holding member.
請求項1に記載された圧力センサチップにおいて、
前記第1の保持部材の曲面状の凹部の底面上には、
複数の凸部が離散的に形成され、
この複数の凸部と凸部との間の通路が前記第1の保持部材の導圧孔の周部と前記第1の保持部材の曲面状の凹部の周端部との間の連通路とされ、
前記第1の保持部材の導圧孔は、
前記複数の凸部と凸部との間の通路上に開口している
ことを特徴とする圧力センサチップ。
The pressure sensor chip according to claim 1,
On the bottom surface of the curved concave portion of the first holding member,
A plurality of convex portions are formed discretely,
A passage between the plurality of convex portions and the convex portion is a communication passage between the peripheral portion of the pressure guiding hole of the first holding member and the peripheral end portion of the curved concave portion of the first holding member. And
The pressure introducing hole of the first holding member is
The pressure sensor chip, wherein the pressure sensor chip is opened on a passage between the plurality of protrusions.
請求項2に記載された圧力センサチップにおいて、
前記第2の保持部材の曲面状の凹部の底面上には、
複数の凸部が離散的に形成され、
この複数の凸部と凸部との間の通路が前記第2の保持部材の導圧孔の周部と前記第2の保持部材の曲面状の凹部の周端部との間の連通路とされ、
前記第2の保持部材の導圧孔は、
前記複数の凸部と凸部との間の通路上に開口している
ことを特徴とする圧力センサチップ。
The pressure sensor chip according to claim 2,
On the bottom surface of the curved concave portion of the second holding member,
A plurality of convex portions are formed discretely,
The passage between the plurality of convex portions and the convex portion is a communication passage between the peripheral portion of the pressure guiding hole of the second holding member and the peripheral end portion of the curved concave portion of the second holding member. And
The pressure introducing hole of the second holding member is
The pressure sensor chip, wherein the pressure sensor chip is opened on a passage between the plurality of protrusions.
請求項1に記載された圧力センサチップにおいて、
前記中心部分は、直径Rの円とされ、
前記延伸部分は、前記直径R以下の幅Wで前記中心部分の外縁の一部から連続して延ばされている
ことを特徴とする圧力センサチップ。
The pressure sensor chip according to claim 1,
The central portion is a circle having a diameter R,
The extending portion is continuously extended from a part of an outer edge of the central portion with a width W equal to or less than the diameter R. The pressure sensor chip.
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