JP4015014B2 - Semiconductor acceleration sensor and manufacturing method thereof - Google Patents

Semiconductor acceleration sensor and manufacturing method thereof Download PDF

Info

Publication number
JP4015014B2
JP4015014B2 JP2002365863A JP2002365863A JP4015014B2 JP 4015014 B2 JP4015014 B2 JP 4015014B2 JP 2002365863 A JP2002365863 A JP 2002365863A JP 2002365863 A JP2002365863 A JP 2002365863A JP 4015014 B2 JP4015014 B2 JP 4015014B2
Authority
JP
Japan
Prior art keywords
weight
pedestal
acceleration sensor
inner peripheral
peripheral surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP2002365863A
Other languages
Japanese (ja)
Other versions
JP2004198207A (en
Inventor
茂 広瀬
正人 安藤
努 澤井
佳幸 中溝
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hokuriku Electric Industry Co Ltd
Original Assignee
Hokuriku Electric Industry Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hokuriku Electric Industry Co Ltd filed Critical Hokuriku Electric Industry Co Ltd
Priority to JP2002365863A priority Critical patent/JP4015014B2/en
Priority to AU2003289410A priority patent/AU2003289410A1/en
Priority to PCT/JP2003/016200 priority patent/WO2004055523A1/en
Publication of JP2004198207A publication Critical patent/JP2004198207A/en
Application granted granted Critical
Publication of JP4015014B2 publication Critical patent/JP4015014B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Images

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P15/12—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance
    • G01P15/123—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values by alteration of electrical resistance by piezo-resistive elements, e.g. semiconductor strain gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/18—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration in two or more dimensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P15/00—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration
    • G01P15/02—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses
    • G01P15/08—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values
    • G01P2015/0805—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration
    • G01P2015/0822—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass
    • G01P2015/084—Measuring acceleration; Measuring deceleration; Measuring shock, i.e. sudden change of acceleration by making use of inertia forces using solid seismic masses with conversion into electric or magnetic values being provided with a particular type of spring-mass-system for defining the displacement of a seismic mass due to an external acceleration for defining out-of-plane movement of the mass the mass being suspended at more than one of its sides, e.g. membrane-type suspension, so as to permit multi-axis movement of the mass

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Pressure Sensors (AREA)

Description

【０００１】
【発明の属する技術分野】
本発明は、半導体加速度センサ及びその製造方法に関するものである。
【０００２】
【従来の技術】
特開平６−１０９７５５号（特許文献１）の第６頁第４図及び特開２０００−２３５０４４公報（特許文献２）の第１２頁第１図には、中心部に重錘固定部が位置し中心部の外側に筒状の支持部が位置し、重錘固定部と支持部との間に加速度センサ素子が形成された可撓性を有する可撓部を備えた加速度センサ本体と、重錘固定部に接合された重錘と、支持部に接合された台座とを具備する半導体加速度センサが示されている。この半導体加速度センサでは、重錘が台座側（下方側）に所定量変位したときに当接する下方ストッパ部材が台座により構成されている。また、重錘が可撓部側（上方側）に所定量変位したときに当接するブロック状の上方ストッパ部材を加速度センサ本体の上方に配置している。このような構成により、重錘が上下方向に変位する変位量の範囲が規制されて、大きな加速度が半導体加速度センサに加えられた際の可撓部の損傷を防いでいる。
【０００３】
【特許文献１】
特開平６−１０９７５５号（第６頁、第４図）
【０００４】
【特許文献２】
特開２０００−２３５０４４公報（第１２頁、第１図）
【０００５】
【発明が解決しようとする課題】
しかしながら、このような半導体加速度センサでは、重錘の上方向に変位する変位量の範囲を規制するために、加速度センサ本体に新たな上方ストッパ部材を配置しなければならず、半導体加速度センサの部品点数が多くなり、半導体加速度センサの厚み寸法が大きくなるという問題があった。
【０００６】
本発明の目的は、部品点数を少なくして厚み寸法を小さくできる半導体加速度センサを提供することにある。
【０００７】
本発明の他の目的は、部品点数を少なくして厚み寸法を小さくできる半導体加速度センサにおいて、台座が固定された加速度センサ本体に重錘を容易に固定できる半導体加速度センサを提供することにある。
【０００８】
【課題を解決するための手段】
本発明が改良の対象とする半導体加速度センサは、中心部に重錘固定部が位置し、中心部の外側に筒状の支持部が位置し、重錘固定部と支持部との間に加速度センサ素子が形成された可撓性を有する可撓部を備えた加速度センサ本体と、重錘固定部に接合され筒状の支持部によって一部が囲まれる重錘と、筒状の支持部に接合された筒状の台座とを具備している。本発明では、重錘は、重錘固定部の中心を通り可撓部が延びる方向と直交する方向に延びる中心線上に中心が位置するように重錘固定部に固定された本体部と、本体部から支持部の内周面に向かって突出する１以上の突出部とを具備している。また、支持部の内周面の形状及び寸法、複数の突出部の形状及び寸法並びに台座の形状及び寸法は、重錘が中心線に沿って可撓部から離れる方向に所定量変位したときには複数の突出部と台座の一部とが当接し、重錘が中心線に沿って可撓部側に所定量変位したときには複数の突出部が内周面に当接し、重錘が中心線と直交する方向に所定量変位したときには複数の突出部の一部が内周面に当接するように定められている。
【０００９】
より具体的には、支持部の内周面は、台座から可撓部に向うにしたがって、前述の中心線に近づくように傾斜しており、台座の可撓部側に位置する上面は、支持部に接合される接合面と、接合面の内側に位置し且つ内周面との間に鋭角を形成するように中心線に向かって延びる露出面とを有している。そして、重錘は、重錘固定部に接合される本体部と、本体部から内周面と露出面との間の間隙内に突出して、重錘が可撓部側に所定量変位したときに内周面と当接する第１の当接部と台座側に所定量変位したときに露出面と当接する第２の当接部とを有する１以上の突出部とを有している。そして、支持部の内周面と第１の当接部とにより重錘が可撓部側及び中心線を中心とする放射方向に変位する変位量の範囲を規制する第１のストッパ構造を構成し、台座の露出面と第２の当接部とにより重錘が台座側に変位する変位量の範囲を規制する第２のストッパ構造を構成する。
【００１０】
本発明によれば、加速度センサ本体の支持部と重錘と台座とにより重錘の上下方向への変位量の範囲を規制するストッパ構造（第１及び第２のストッパ構造）を構成することができるので、従来のように、加速度センサ本体に新たな上方ストッパ部材を配置する必要がない。そのため、半導体加速度センサの部品点数を少なくして半導体加速度センサの厚み寸法を小さくできる。
【００１１】
重錘は重錘固定部に熱硬化性接着剤を介して接合し、台座はガラス材料により形成し、且つ台座と支持部とは熱硬化性接着剤の硬化温度よりも高い加熱温度を伴う陽極接合により接合すれば、半導体加速度センサを容易に製造することができる。しかしながら、このような場合、重錘を重錘固定部に接合した後に、台座と加速度センサ本体の支持部とを接合すると、重錘と重錘固定部とを接合する熱硬化性接着剤が陽極接合の際に高熱に晒されて、接着剤の接着強度が低下するおそれがある。そのため、台座と加速度センサ本体の支持部とを接合した後に重錘を重錘固定部に接合することが求められる。そこで、１以上の突出部を複数の突出部から構成し、台座の内周部の形状は、重錘が重錘固定部に接合される際に、重錘の複数の突出部の通過を許容し、且つ保持部の内部に複数の突出部が入った状態で中心線を中心にして重錘が所定の角度回転させられた状態で複数の突出部の通過を阻止し得る形状に（複数の突出部の第２の当接部が露出面と対向するように）定める。このような半導体加速度センサを製造するには、まず、加速度センサ本体の支持部と台座とを陽極接合により接合する。次に、加速度センサ本体及び重錘の両接合部分の少なくとも一方に熱硬化性接着剤を塗布し、複数の突出部を、筒状の台座の中空部を介して支持部の内部に挿入する。その後に、前述の中心線を中心にして重錘を所定角度回転して、複数の突出部の通過が台座により阻止される位置に（複数の突出部の第２の当接部が露出面と対向するように）突出部の先端を配置し、重錘と重錘固定部とを当接した状態で接着剤を硬化させて、重錘と重錘固定部とを接合する。このような構成を採用すれば、加速度センサ本体と接合された台座内に重錘を挿入して回転させるだけで、台座と加速度センサ本体の支持部とを接合した後に重錘を重錘固定部に接合することができる。そのため、接着剤の接着強度を低下させることなく半導体加速度センサを製造することができる。
【００１２】
少なくとも可撓部が延びる方向の直交する二方向（２軸）の加速度を測定するには、複数の突出部を、重錘の本体部の外周部に中心線を中心にして９０°ずつ離れた位置に本体部と一体に設けられた４つの突出部から構成すればよい。
【００１３】
通常、支持部の内周面は、切頭角錐形の内部空間の外周面に倣うように、実質的に同形状の４つの台形状の傾斜面が環状に組み合わされて構成することが多い。この場合、突出部は、中心線を中心にして９０°ずつ間隔をあけて放射方向に延びる４本の仮想放射線上に頂点が位置するように突出させ、頂点は放射方向に向かって凸となる湾曲面の一部によって構成するのが好ましい。このようにすれば、湾曲面上の頂点となる部分を含むように線状または点状の第１の当接部が構成されるため、支持部及び突出部に寸法誤差が生じても、第１の当接部の形状及び寸法をほぼ一定に維持することができる。
【００１４】
加速度センサ素子は、相互に直交するＸ軸方向、Ｙ軸方向及びＺ軸方向の三軸の加速度をそれぞれ検出するように構成することができる。この場合、突出部は、中心線を中心にして９０°ずつ間隔をあけてＸ軸方向及びＹ軸方向の放射方向に延びる４本の仮想放射線上に頂点が位置するように突出させればよい。
【００１５】
第１の当接部及び第２の当接部は、重錘に加速度が作用していない状態で、傾斜面及び露出面とそれぞれ平行に延ばすのが好ましい。このようにすれば、第１の当接部及び第２の当接部を傾斜面及び露出面にそれぞれ適宜な寸法で当接させることができる。また、突出部は、第１の当接部に連続して延びて可撓部に向かうにしたがって傾斜面から離れるように傾斜して傾斜面に対向する対向傾斜部を更に有しているのが好ましい。このようにすれば、第１の当接部の寸法が限定され、重錘が傾斜面に強く当接するのを防止できる。
【００１６】
台座の内周面は、加速度センサ本体と反対側に開口する外側開口部から加速度センサ本体側に開口する内側開口部に向うにしたがって、中心線に近づくように傾斜させるのが好ましい。このようにすれば、台座の外側開口部と重錘との距離が大きくなるため、台座を接着剤を用いて被取付部材に接合しても、接着剤が重錘に付着するのを防ぐことができる。
【００１７】
重錘の本体部は、重錘固定部を囲むように領域内に配置されて４つの突出部と一体に結合された固定部周囲部を有するように構成し、固定部周囲部には、４つの突出部にほぼ隣接する位置に可撓部側に開口する４つの凹部を形成するのが好ましい。このようにすれば、突出部の加工精度が悪くなっても、４つの突出部による重錘全体のバランスが低下するのを防ぐことができる。
【００１８】
【発明の実施の形態】
以下、図面を参照して本発明の実施の形態を詳細に説明する。図１は、本発明の一実施の形態の半導体加速度センサの断面図であり、図２は、図１に示す半導体加速度センサを台座３側から見た裏面図である。両図に示すように、本発明の実施の形態の半導体加速度センサは、加速度センサ本体１と加速度センサ本体１を支持する台座３と加速度センサ本体１に固定された重錘５とを有している。
【００１９】
加速度センサ本体１は、中心部に重錘固定部７が位置し、中心部の外側に筒状の支持部９が位置し、重錘固定部７と支持部９との間に可撓性を有する可撓部１１を有するように単結晶シリコンからなる半導体結晶基板に異方性エッチングが施されて形成されている。加速度センサ本体１の表面の可撓部１１上には、加速度検出用拡散抵抗からなる複数のセンサ素子が形成されている。本例の半導体加速度センサは、外部から加えられた力による加速度、または傾斜させた静止状態で加わる重力加速度に基づく力により重錘５が動いて可撓部１１が撓むことにより、センサ素子を構成する各拡散抵抗の抵抗値が変化して歪み量に応じた加速度を検出する。本例では、複数のセンサ素子は、相互に直交して可撓部１１が延びる方向のＸ軸方向及びＹ軸方向と、Ｘ軸方向及びＹ軸方向に直交するＺ軸方向との３軸方向の加速度を検出する。
【００２０】
重錘固定部７は、可撓部１１から重錘５に向かって突出した形状を有しており、重錘固定部７の中心を通り可撓部１１が延びる方向と直交する方向（Ｚ軸方向）に延びる中心線Ｃ上に中心が位置するように、先端に重錘５が固定されている。この重錘固定部７は、多角形の横断面を有しており、その外周面は、可撓部１１が位置する側から離れる（即ち、重錘５に向かう）に従って中心線Ｃに近づくように傾斜している。
【００２１】
支持部９は、矩形の筒状を有しており、その内周面１３は、切頭角錐形の空間の外周面に倣うように、実質的に同形状の４つの台形状の傾斜面１３Ａ〜１３Ｄが環状に組み合わされて構成されている。なお、図２においては、傾斜面１３Ａ〜１３Ｄは一点鎖線で囲んで示している。傾斜面１３Ａ〜１３Ｄは、可撓部１１が位置する側に向かうに従って中心線Ｃに近づくように傾斜している。本例では、傾斜面１３Ａ〜１３Ｄの中心線Ｃに対する傾斜角度θは３０°を有している。このような支持部９の内周面１３の構造により、重錘固定部７と支持部９と可撓性１１とに囲まれた領域の内部空間１５の外面は、可撓部１１に向かって横断面形状が小さくなる切頭角錐形状を有することになる。
【００２２】
台座３は、ガラス製のほぼ四角の筒体により形成されており、加速度センサ本体１側に開口する内側開口部１９と加速度センサ本体１と反対側に開口する外側開口部２１とを有している。台座３の可撓部１１側に位置する上面は、支持部９に接合される接合面２３と、接合面２３の内側に位置し且つ支持部９の内周面１３との間に鋭角（５４．７°）を形成するように中心線Ｃに向かって延びる環状の露出面２５とを有している。これにより、図３に示すように、加速度センサ本体１の内周面１３と台座３の露出面２５との間には、間隙２７が形成されることになる。また、図１に示すように、台座３の内周面２９は、外側開口部２１から内側開口部１９に向うにしたがって、中心線Ｃに近づくように傾斜している。内側開口部１９及び外側開口部２１は、ほぼ矩形の形状を有しており、図５に示すように、重錘５が重錘固定部７に接合される際に、支持部９の切頭角錐形の内周面１３により形成される底面の２つの仮想対角線ＤＬ１，ＤＬ２に対応して重錘５の後述する４つの突出部３１Ａ〜３１Ｄを位置させた状態で重錘５の突出部３１Ａ〜３１Ｄの通過を許容し、且つ支持部９の内部に突出部３１Ａ〜３１Ｄが入った状態で中心線Ｃを中心にして重錘５が所定の角度（４５°）回転させられると、突出部３１Ａ〜３１Ｄの通過を阻止し得る形状に定められている。
【００２３】
重錘５は、タングステンにより形成されており、重錘固定部７に固定される本体部３０と、本体部３０と一体に設けられて本体部３０から内周面１３と露出面２５との間の間隙２７内に突出する４つの突出部３１Ａ〜３１Ｄとを有している。本体部３０は、中心部が重錘固定部７に接合されるほぼ円板状の被接合部３３と被接合部３３の上面に一体に結合された固定部周囲部３５とを有している。固定部周囲部３５は、環状形状を有しており、重錘固定部７を囲むように内部空間１５内に配置されている。
【００２４】
４つの突出部３１Ａ〜３１Ｄの各突出部は、図４（Ａ）及び（Ｂ）の部分図に示すように、重錘固定部７が位置する側から見た輪郭形状［図４（Ａ）］が支持部９側に膨出するほぼ半円の形状を有し、支持部９側から見た輪郭形状［図４（Ｂ）］が可撓部１１側に膨出するほぼ半円の形状を有するように、内周面１３と対向する湾曲部３７と露出面２５に対向する平面部３９とを有している。そして、図２に示すように、中心線Ｃを中心にして９０°ずつ間隔をあけてＸ軸方向及びＹ軸方向の放射方向に延びる４本の仮想放射線ＸＬ１，ＸＬ２，ＹＬ１，ＹＬ２上に湾曲面の一部によって構成される頂点が位置するように突出している。図３に示すように、湾曲部３７には、重錘５に加速度が作用していない状態で、内周面１３と平行に延びる線状の第１の当接部４１と第１の当接部４１に連続して延びる対向傾斜部４３とが形成されている。対向傾斜部４３は、可撓部１１に向かうにしたがって内周面１３から離れるように傾斜している。平面部３９には、重錘５に加速度が作用していない状態で、台座３の露出面２５と平行に延びる面状の第２の当接部４５が形成されている。本例では、第１の当接部４１と内周面１３との間の間隙Ｇ１の寸法及び第２の当接部４５と露出面２５との間の間隙Ｇ２の寸法は、５〜２０μｍに設定されている。第１の当接部４１は、前述した湾曲面３７上の頂点に対応する部分を含んで構成されている。この第１の当接部４１は、重錘５が可撓部１１側及び支持部９側に所定量変位したときに内周面１３と当接する寸法に設定されており、この第１の当接部４１と内周面１３とにより重錘５が可撓部１１側及び中心線Ｃを中心とする放射方向に変位する変位量の範囲を規制する第１のストッパ構造が構成されている。第２の当接部４５は、重錘５が台座３側に所定量変位したときに露出面２５と当接する寸法に設定されており、この第２の当接部４５と露出面２５とにより重錘５が台座３側に変位する変位量の範囲を規制する第２のストッパ構造が構成されている。本例のように第１及び第２のストッパ構造を構成すれば、加速度センサ本体１の支持部９と重錘５と台座３とにより重錘５の上下方向への変位量の範囲を規制するストッパ構造（第１及び第２のストッパ構造）を構成することができるので、従来のように、加速度センサ本体に新たな上方ストッパ部材を配置する必要がない。そのため、半導体加速度センサの部品点数を少なくして半導体加速度センサの厚み寸法を小さくできる。
【００２５】
次に本例の半導体加速度センサにおいて重錘５を加速度センサ本体１に接合する方法について説明する。まず、加速度センサ本体１の支持部９と台座３とを約４００℃の加熱を伴う陽極接合により接合する。次に、加速度センサ本体の重錘固定部７及び重錘５の両接合部分の少なくとも一方に熱硬化性接着剤を塗布する。次に、図５に示すように、４つの突出部３１Ａ〜３１Ｄを、切頭角錐形の内周面１３により形成される底面の仮想対角線ＤＬ１，ＤＬ２上に配置した状態で、筒状の台座３の中空部を介して内部空間１５内に挿入する。
【００２６】
次に、重錘５を中心線Ｃを中心に矢印Ａの方向へ所定の角度（４５°）回転して、図２及び図３に示すように、突出部３１Ａ〜３１Ｄの先端の第２の当接部４５を露出面２５と対向させる位置に（４つの突出部３１Ａ〜３１Ｄの通過が台座３により阻止される位置に）突出部３１Ａ〜３１Ｄの先端を配置する。言い換えるならば、突出部３１Ａ〜３１Ｄを傾斜面１３Ａ〜１３Ｄと露出面２５との間のそれぞれの間隙２７内に配置する。そして、重錘５と重錘固定部７とを当接した状態で熱硬化性接着剤を約２００℃で硬化させて、重錘５と重錘固定部７とを接合して製造を完了する。
【００２７】
重錘５を重錘固定部７に接合した後に、台座３と加速度センサ本体１の支持部９とを接合すると、重錘５と重錘固定部７とを接合する熱硬化性接着剤が陽極接合の際に熱硬化以上の高熱（約４００℃）に晒されて、接着剤の接着強度が低下するおそれがある。そこで、本例のように半導体加速度センサを製造すれば、台座３と加速度センサ本体１の支持部９とを接合した後に、重錘５を重錘固定部７に接合することができる。そのため、接着剤の接着強度を低下させることなく半導体加速度センサを製造することができる。
【００２８】
図６及び図７は、本発明の他の実施の形態の半導体加速度センサに用いる重錘１０５の断面図及び平面図を示している。本例で用いる重錘１０５は、固定部周囲部１３５に４つの凹部１００…が形成されており、この凹部１００…を除く部分については、図１〜３に示す重錘５と同じ構造を有している。そのため、図１〜３に示す重錘５と同じ部分には、図１〜３に付した符号に１００を加えた符号を付して説明を省略する。
【００２９】
凹部１００は、４つの突出部１３１Ａ〜１３１Ｄにほぼ隣接する位置に形成されており、可撓部側に開口している。凹部１００を設けることにより、突出部１３１Ａ〜１３１Ｄの加工精度が悪くなっても、突出部１３１Ａ〜１３１Ｄによる重錘１０５のバランスが低下するのを防ぐことができる。
【００３０】
【発明の効果】
本発明によれば、加速度センサ本体の支持部と重錘と台座とにより重錘の上下方向への変位量の範囲を規制するストッパ構造（第１及び第２のストッパ構造）を構成することができるので、従来のように、加速度センサ本体に新たな上方ストッパ部材を配置する必要がない。そのため、半導体加速度センサの部品点数を少なくして半導体加速度センサの厚み寸法を小さくできる。
【００３１】
また、加速度センサ本体と接合された台座内に重錘を挿入して回転させるだけで、台座と加速度センサ本体の支持部とを接合した後に重錘を重錘固定部に接合することができる。そのため、接着剤の接着強度を低下させることなく半導体加速度センサを製造することができる。
【図面の簡単な説明】
【図１】本発明の一実施の形態の半導体加速度センサの断面図である。
【図２】図１に示す半導体加速度センサを台座側から見た裏面図である。
【図３】図１に示す半導体加速度センサの部分拡大図である。
【図４】（Ａ）及び（Ｂ）は、図１に示す半導体加速度センサの部分拡大図である。
【図５】図１に示す半導体加速度センサの製造方法を説明するために用いる図である。
【図６】本発明の他の実施の形態の半導体加速度センサに用いる重錘の断面図である
【図７】図５に示す重錘の平面図である。
【符号の説明】
１ 加速度センサ本体
３ 台座
５ 重錘
７ 重錘固定部
９ 支持部
１１ 可撓部
１３ 内周面
１３Ａ〜１３Ｄ 傾斜面
２５ 露出面
２７ 間隙
３０ 本体部
３１ 突出部
３１Ａ〜３１Ｄ 突出部
３５ 固定部周囲部
４１ 第１の当接部
４５ 第２の当接部
１００ 凹部
Ｃ 中心線[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a semiconductor acceleration sensor and a manufacturing method thereof.
[0002]
[Prior art]
In Fig. 6 on page 6 of JP-A-6-109755 (Patent Document 1) and Fig. 12 on page 12 of JP-A-2000-235444 (Patent Document 2), a weight fixing portion is located at the center. An acceleration sensor main body having a flexible flexible portion in which a cylindrical support portion is located outside the central portion and an acceleration sensor element is formed between the weight fixing portion and the support portion; A semiconductor acceleration sensor including a weight joined to a fixed portion and a pedestal joined to a support portion is shown. In this semiconductor acceleration sensor, the pedestal includes a lower stopper member that comes into contact when the weight is displaced by a predetermined amount toward the pedestal side (lower side). Further, a block-like upper stopper member that contacts when the weight is displaced by a predetermined amount toward the flexible part side (upper side) is disposed above the acceleration sensor main body. With such a configuration, the range of the amount of displacement in which the weight is displaced in the vertical direction is restricted, and damage to the flexible portion when a large acceleration is applied to the semiconductor acceleration sensor is prevented.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 6-109755 (page 6, FIG. 4)
[0004]
[Patent Document 2]
JP 2000-235044 (page 12, FIG. 1)
[0005]
[Problems to be solved by the invention]
However, in such a semiconductor acceleration sensor, a new upper stopper member must be disposed in the acceleration sensor main body in order to regulate the range of the amount of displacement upwardly moving the weight. There is a problem that the number of points increases and the thickness dimension of the semiconductor acceleration sensor increases.
[0006]
An object of the present invention is to provide a semiconductor acceleration sensor capable of reducing the number of components and reducing the thickness dimension.
[0007]
Another object of the present invention is to provide a semiconductor acceleration sensor capable of easily fixing a weight to an acceleration sensor main body to which a pedestal is fixed, in a semiconductor acceleration sensor capable of reducing the number of parts and reducing the thickness dimension.
[0008]
[Means for Solving the Problems]
The semiconductor acceleration sensor to be improved by the present invention has a weight fixing portion located at the center, a cylindrical support portion located outside the center, and an acceleration between the weight fixing portion and the support portion. An acceleration sensor main body having a flexible portion having flexibility, in which a sensor element is formed, a weight bonded to the weight fixing portion and partially surrounded by the cylindrical support portion, and a cylindrical support portion And a joined cylindrical pedestal. In the present invention, the weight includes a body portion fixed to the weight fixing portion so that the center is positioned on a center line extending in a direction orthogonal to the direction in which the flexible portion extends through the center of the weight fixing portion, And one or more projecting portions projecting from the portion toward the inner peripheral surface of the support portion. Further, the shape and size of the inner peripheral surface of the support portion, the shape and size of the plurality of protruding portions, and the shape and size of the pedestal are plural when the weight is displaced by a predetermined amount in the direction away from the flexible portion along the center line. When the weight is displaced by a predetermined amount along the center line toward the flexible part, the plurality of protrusions contact the inner peripheral surface, and the weight is orthogonal to the center line. It is determined that a part of the plurality of projecting portions abuts on the inner peripheral surface when displaced by a predetermined amount in the direction.
[0009]
More specifically, the inner peripheral surface of the support portion is inclined so as to approach the above-mentioned center line as it goes from the pedestal toward the flexible portion, and the upper surface located on the flexible portion side of the pedestal is supported. A joint surface to be joined to the portion, and an exposed surface that is located inside the joint surface and extends toward the center line so as to form an acute angle with the inner peripheral surface. The weight protrudes into the gap between the main body portion joined to the weight fixing portion and the inner peripheral surface and the exposed surface from the main body portion, and the weight is displaced by a predetermined amount toward the flexible portion side. And at least one protrusion having a first contact portion that contacts the inner peripheral surface and a second contact portion that contacts the exposed surface when displaced by a predetermined amount toward the pedestal side. And the 1st stopper structure which regulates the range of the amount of displacement which a weight displaces in the radial direction centering on a flexible part side and a center line is constituted by the inner peripheral surface of a support part, and the 1st contact part. The exposed surface of the pedestal and the second contact portion constitute a second stopper structure that regulates the range of the amount of displacement by which the weight is displaced toward the pedestal.
[0010]
According to the present invention, it is possible to configure the stopper structure (first and second stopper structures) that regulates the range of the amount of displacement of the weight in the vertical direction by the support portion of the acceleration sensor body, the weight, and the pedestal. Therefore, it is not necessary to arrange a new upper stopper member in the acceleration sensor main body as in the prior art. Therefore, the thickness of the semiconductor acceleration sensor can be reduced by reducing the number of parts of the semiconductor acceleration sensor.
[0011]
The weight is bonded to the weight fixing portion via a thermosetting adhesive, the pedestal is formed of a glass material, and the pedestal and the support portion are anodes having a heating temperature higher than the curing temperature of the thermosetting adhesive. If it joins by joining, a semiconductor acceleration sensor can be manufactured easily. However, in such a case, when the weight is joined to the weight fixing portion and then the base and the support portion of the acceleration sensor body are joined, the thermosetting adhesive that joins the weight and the weight fixing portion is the anode. There is a possibility that the adhesive strength of the adhesive may be reduced by being exposed to high heat during bonding. Therefore, it is required to join the weight to the weight fixing portion after joining the base and the support portion of the acceleration sensor body. Therefore, one or more protrusions are composed of a plurality of protrusions, and the shape of the inner periphery of the pedestal allows passage of the plurality of protrusions of the weight when the weight is joined to the weight fixing part. In addition, in a state where a plurality of protrusions enter the holding portion, the weight can be prevented from passing through the plurality of protrusions while the weight is rotated by a predetermined angle around the center line (a plurality of protrusions). The second contact portion of the protruding portion is defined so as to face the exposed surface. In order to manufacture such a semiconductor acceleration sensor, first, the support portion of the acceleration sensor body and the pedestal are joined by anodic bonding. Next, a thermosetting adhesive is applied to at least one of the joint portions of the acceleration sensor main body and the weight, and the plurality of protruding portions are inserted into the support portion through the hollow portion of the cylindrical pedestal. After that, the weight is rotated by a predetermined angle around the above-mentioned center line, and a position where the passage of the plurality of protrusions is blocked by the pedestal (the second contact portion of the plurality of protrusions is the exposure surface) The tip of the projecting portion is disposed so as to face each other, and the adhesive is cured in a state where the weight and the weight fixing portion are in contact with each other, thereby joining the weight and the weight fixing portion. If such a configuration is adopted, the weight is inserted into the pedestal joined to the acceleration sensor body and rotated, and the weight is fixed to the weight fixing part after joining the pedestal and the support part of the acceleration sensor body. Can be joined. Therefore, a semiconductor acceleration sensor can be manufactured without reducing the adhesive strength of the adhesive.
[0012]
In order to measure acceleration in at least two directions (two axes) perpendicular to the direction in which the flexible portion extends, a plurality of protrusions are separated from each other by 90 ° around the center line on the outer periphery of the main body of the weight. What is necessary is just to comprise from the 4 protrusion part provided in the position integrally with the main-body part.
[0013]
In general, the inner peripheral surface of the support part is often configured by annularly combining four trapezoidal inclined surfaces having substantially the same shape so as to follow the outer peripheral surface of the truncated pyramid internal space. In this case, the protrusions protrude so that the apexes are located on four virtual radiations extending in the radial direction at intervals of 90 ° around the center line, and the apexes are convex in the radial direction. It is preferable that it is constituted by part of the curved surface. In this way, the linear or dot-like first abutting portion is configured to include the portion that becomes the apex on the curved surface, so even if a dimensional error occurs in the support portion and the protruding portion, the first The shape and size of one abutting portion can be maintained substantially constant.
[0014]
The acceleration sensor element can be configured to detect triaxial accelerations in the X-axis direction, the Y-axis direction, and the Z-axis direction that are orthogonal to each other. In this case, the protrusions may be protruded so that the apexes are located on the four virtual radiations extending in the X-axis direction and the Y-axis direction in the radial direction with an interval of 90 ° about the center line. .
[0015]
It is preferable that the first contact portion and the second contact portion extend in parallel with the inclined surface and the exposed surface, respectively, in a state where no acceleration acts on the weight. If it does in this way, the 1st contact part and the 2nd contact part can be made to contact with an inclined surface and an exposed surface by a suitable size, respectively. The protruding portion further includes an opposing inclined portion that extends continuously from the first contact portion and is inclined so as to be separated from the inclined surface toward the flexible portion and faces the inclined surface. preferable. In this way, the dimension of the first contact portion is limited, and the weight can be prevented from strongly contacting the inclined surface.
[0016]
The inner peripheral surface of the pedestal is preferably inclined so as to approach the center line from the outer opening opening on the opposite side to the acceleration sensor main body toward the inner opening opening on the acceleration sensor main body side. In this way, since the distance between the outer opening of the pedestal and the weight increases, even if the pedestal is bonded to the mounting member using an adhesive, the adhesive is prevented from adhering to the weight. Can do.
[0017]
The main body portion of the weight is configured to have a fixed portion surrounding portion that is disposed in the region so as to surround the weight fixing portion and is integrally coupled with the four protruding portions. It is preferable to form four concave portions that open to the flexible portion side at positions substantially adjacent to the two projecting portions. If it does in this way, even if the process precision of a protrusion part worsens, it can prevent that the balance of the whole weight by four protrusion parts falls.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a semiconductor acceleration sensor according to an embodiment of the present invention, and FIG. 2 is a back view of the semiconductor acceleration sensor shown in FIG. As shown in both figures, the semiconductor acceleration sensor according to the embodiment of the present invention includes an acceleration sensor body 1, a pedestal 3 that supports the acceleration sensor body 1, and a weight 5 fixed to the acceleration sensor body 1. Yes.
[0019]
In the acceleration sensor main body 1, the weight fixing portion 7 is located at the center, and the cylindrical support portion 9 is located outside the center portion, so that flexibility is provided between the weight fixing portion 7 and the support portion 9. The semiconductor crystal substrate made of single crystal silicon is formed by anisotropic etching so as to have the flexible portion 11 having the same. On the flexible part 11 on the surface of the acceleration sensor main body 1, a plurality of sensor elements made of diffusion resistance for acceleration detection are formed. In the semiconductor acceleration sensor of this example, the weight 5 moves due to the acceleration based on the force applied from the outside or the force based on the gravitational acceleration applied in the tilted stationary state, and the flexible portion 11 bends. The resistance value of each of the diffusion resistors that are configured changes to detect the acceleration corresponding to the amount of strain. In this example, the plurality of sensor elements are triaxial directions of the X axis direction and the Y axis direction in the direction in which the flexible portion 11 extends perpendicular to each other, and the Z axis direction orthogonal to the X axis direction and the Y axis direction. The acceleration of is detected.
[0020]
The weight fixing part 7 has a shape protruding from the flexible part 11 toward the weight 5, and passes through the center of the weight fixing part 7 and is perpendicular to the direction in which the flexible part 11 extends (Z-axis). The weight 5 is fixed to the tip so that the center is located on the center line C extending in the direction). The weight fixing part 7 has a polygonal cross section, and its outer peripheral surface approaches the center line C as it moves away from the side where the flexible part 11 is located (that is, toward the weight 5). It is inclined to.
[0021]
The support portion 9 has a rectangular cylindrical shape, and its inner peripheral surface 13 has four trapezoidal inclined surfaces 13A having substantially the same shape so as to follow the outer peripheral surface of the truncated pyramid space. ˜13D are combined in a ring shape. In FIG. 2, the inclined surfaces 13 </ b> A to 13 </ b> D are surrounded by a one-dot chain line. The inclined surfaces 13A to 13D are inclined so as to approach the center line C toward the side where the flexible portion 11 is located. In this example, the inclination angle θ with respect to the center line C of the inclined surfaces 13A to 13D has 30 °. Due to the structure of the inner peripheral surface 13 of the support portion 9, the outer surface of the internal space 15 in the region surrounded by the weight fixing portion 7, the support portion 9, and the flexibility 11 faces the flexible portion 11. It has a truncated pyramid shape with a small cross-sectional shape.
[0022]
The pedestal 3 is formed of a substantially rectangular cylinder made of glass, and has an inner opening 19 that opens to the acceleration sensor main body 1 side and an outer opening 21 that opens to the opposite side of the acceleration sensor main body 1. Yes. The upper surface located on the flexible part 11 side of the pedestal 3 has an acute angle (54) between the joint surface 23 joined to the support part 9 and the inner peripheral surface 13 of the support part 9 located inside the joint surface 23. .7 °) and an annular exposed surface 25 extending toward the center line C. Thereby, as shown in FIG. 3, a gap 27 is formed between the inner peripheral surface 13 of the acceleration sensor main body 1 and the exposed surface 25 of the base 3. As shown in FIG. 1, the inner peripheral surface 29 of the pedestal 3 is inclined so as to approach the center line C from the outer opening 21 toward the inner opening 19. The inner opening 19 and the outer opening 21 have a substantially rectangular shape, and when the weight 5 is joined to the weight fixing portion 7 as shown in FIG. A protrusion 31A of the weight 5 in a state where four protrusions 31A to 31D (to be described later) of the weight 5 are positioned corresponding to the two virtual diagonal lines DL1 and DL2 on the bottom surface formed by the inner peripheral surface 13 of the pyramid shape. When the weight 5 is rotated by a predetermined angle (45 °) around the center line C with the protrusions 31 </ b> A to 31 </ b> D being allowed to pass through 31 </ b> D inside the support portion 9, the protrusion It is determined to have a shape that can prevent passage of 31A to 31D.
[0023]
The weight 5 is made of tungsten, and is provided with a body portion 30 fixed to the weight fixing portion 7 and the body portion 30 so as to be integrated between the inner peripheral surface 13 and the exposed surface 25 from the body portion 30. And four projecting portions 31 </ b> A to 31 </ b> D projecting into the gap 27. The main body 30 has a substantially disc-shaped bonded portion 33 whose central portion is bonded to the weight fixing portion 7 and a fixed portion surrounding portion 35 integrally coupled to the upper surface of the bonded portion 33. . The fixed portion surrounding portion 35 has an annular shape and is disposed in the internal space 15 so as to surround the weight fixing portion 7.
[0024]
As shown in the partial views of FIGS. 4A and 4B, each of the four protruding portions 31 </ b> A to 31 </ b> D has a contour shape viewed from the side where the weight fixing portion 7 is located [FIG. 4A. ] Has a substantially semicircular shape that bulges to the support portion 9 side, and an outline shape [FIG. 4B] seen from the support portion 9 side bulges to the flexible portion 11 side. A curved portion 37 that faces the inner peripheral surface 13 and a flat portion 39 that faces the exposed surface 25. Then, as shown in FIG. 2, the curves are curved on the four virtual rays XL1, XL2, YL1, and YL2 extending in the X-axis direction and the Y-axis direction at intervals of 90 ° about the center line C. It protrudes so that the vertex constituted by a part of the surface is located. As shown in FIG. 3, the curved portion 37 has a linear first contact portion 41 and a first contact that extend in parallel with the inner peripheral surface 13 in a state in which no acceleration acts on the weight 5. An opposing inclined portion 43 extending continuously from the portion 41 is formed. The opposing inclined portion 43 is inclined so as to be separated from the inner peripheral surface 13 toward the flexible portion 11. A planar second abutting portion 45 extending in parallel with the exposed surface 25 of the pedestal 3 is formed on the flat surface 39 in a state where no acceleration acts on the weight 5. In this example, the size of the gap G1 between the first contact portion 41 and the inner peripheral surface 13 and the size of the gap G2 between the second contact portion 45 and the exposed surface 25 are 5 to 20 μm. Is set. The first contact portion 41 is configured to include a portion corresponding to the vertex on the curved surface 37 described above. The first abutting portion 41 is set to a size that abuts against the inner peripheral surface 13 when the weight 5 is displaced by a predetermined amount toward the flexible portion 11 side and the support portion 9 side. The contact portion 41 and the inner peripheral surface 13 constitute a first stopper structure that regulates the range of the displacement amount in which the weight 5 is displaced in the radial direction around the flexible portion 11 side and the center line C. The second abutting portion 45 is set to a size that abuts on the exposed surface 25 when the weight 5 is displaced to the pedestal 3 side by a predetermined amount. The second abutting portion 45 and the exposed surface 25 A second stopper structure that restricts the range of the displacement amount by which the weight 5 is displaced toward the pedestal 3 is configured. If the first and second stopper structures are configured as in this example, the range of the amount of displacement of the weight 5 in the vertical direction is regulated by the support portion 9 of the acceleration sensor main body 1, the weight 5 and the pedestal 3. Since the stopper structure (first and second stopper structures) can be configured, there is no need to arrange a new upper stopper member in the acceleration sensor main body as in the prior art. Therefore, the thickness of the semiconductor acceleration sensor can be reduced by reducing the number of parts of the semiconductor acceleration sensor.
[0025]
Next, a method of joining the weight 5 to the acceleration sensor main body 1 in the semiconductor acceleration sensor of this example will be described. First, the support portion 9 and the base 3 of the acceleration sensor main body 1 are joined by anodic bonding with heating at about 400 ° C. Next, a thermosetting adhesive is applied to at least one of the joint portions of the weight fixing portion 7 and the weight 5 of the acceleration sensor body. Next, as shown in FIG. 5, the cylindrical pedestal in a state where the four protrusions 31 </ b> A to 31 </ b> D are disposed on the virtual diagonal lines DL <b> 1 and DL <b> 2 of the bottom surface formed by the truncated pyramid inner peripheral surface 13. 3 is inserted into the internal space 15 through the hollow portion.
[0026]
Next, the weight 5 is rotated by a predetermined angle (45 °) about the center line C in the direction of the arrow A, and as shown in FIGS. 2 and 3, the second ends of the protrusions 31 </ b> A to 31 </ b> D are second. The tips of the protrusions 31A to 31D are disposed at positions where the contact portion 45 faces the exposed surface 25 (at positions where passage of the four protrusions 31A to 31D is blocked by the base 3). In other words, the protrusions 31 </ b> A to 31 </ b> D are disposed in the respective gaps 27 between the inclined surfaces 13 </ b> A to 13 </ b> D and the exposed surface 25. Then, the thermosetting adhesive is cured at about 200 ° C. while the weight 5 and the weight fixing portion 7 are in contact with each other, and the weight 5 and the weight fixing portion 7 are joined to complete the manufacturing. .
[0027]
When the pedestal 3 and the support portion 9 of the acceleration sensor body 1 are joined after joining the weight 5 to the weight fixing portion 7, the thermosetting adhesive that joins the weight 5 and the weight fixing portion 7 is an anode. When joining, it is exposed to high heat (about 400 ° C.) higher than thermosetting, and the adhesive strength of the adhesive may be lowered. Therefore, if a semiconductor acceleration sensor is manufactured as in this example, the weight 5 can be joined to the weight fixing part 7 after joining the base 3 and the support part 9 of the acceleration sensor body 1. Therefore, a semiconductor acceleration sensor can be manufactured without reducing the adhesive strength of the adhesive.
[0028]
6 and 7 show a sectional view and a plan view of a weight 105 used in a semiconductor acceleration sensor according to another embodiment of the present invention. The weight 105 used in this example has four recesses 100 formed in the peripheral part 135 of the fixed part, and the portion other than the recesses 100 has the same structure as the weight 5 shown in FIGS. is doing. Therefore, the same parts as the weight 5 shown in FIGS. 1 to 3 are denoted by reference numerals obtained by adding 100 to the reference numerals attached to FIGS.
[0029]
The recess 100 is formed at a position substantially adjacent to the four protrusions 131A to 131D, and is open to the flexible part side. By providing the recess 100, it is possible to prevent the balance of the weight 105 by the protrusions 131A to 131D from being lowered even if the processing accuracy of the protrusions 131A to 131D is deteriorated.
[0030]
【The invention's effect】
According to the present invention, the stopper structure (first and second stopper structures) that restricts the range of the amount of displacement of the weight in the vertical direction can be configured by the support portion of the acceleration sensor body, the weight, and the pedestal. Therefore, it is not necessary to arrange a new upper stopper member in the acceleration sensor main body as in the prior art. Therefore, the thickness of the semiconductor acceleration sensor can be reduced by reducing the number of parts of the semiconductor acceleration sensor.
[0031]
Further, the weight can be joined to the weight fixing portion after joining the pedestal and the support portion of the acceleration sensor body simply by inserting and rotating the weight into the pedestal joined to the acceleration sensor body. Therefore, a semiconductor acceleration sensor can be manufactured without reducing the adhesive strength of the adhesive.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a semiconductor acceleration sensor according to an embodiment of the present invention.
FIG. 2 is a back view of the semiconductor acceleration sensor shown in FIG. 1 as viewed from the pedestal side.
3 is a partially enlarged view of the semiconductor acceleration sensor shown in FIG. 1. FIG.
4A and 4B are partial enlarged views of the semiconductor acceleration sensor shown in FIG.
5 is a view used for explaining a method of manufacturing the semiconductor acceleration sensor shown in FIG. 1. FIG.
6 is a cross-sectional view of a weight used in a semiconductor acceleration sensor according to another embodiment of the present invention. FIG. 7 is a plan view of the weight shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Acceleration sensor main body 3 Base 5 Weight 7 Weight fixing | fixed part 9 Support part 11 Flexible part 13 Inner peripheral surface 13A-13D Inclined surface 25 Exposed surface 27 Gap | interval 30 Main body part 31 Projection part 31A-31D Projection part 35 Around fixed part Part 41 First contact part 45 Second contact part 100 Recess C Centerline

Claims (13)

中心部に重錘固定部が位置し、前記中心部の外側に筒状の支持部が位置し、前記重錘固定部と前記支持部との間に加速度センサ素子が形成された可撓性を有する可撓部を備えた加速度センサ本体と、
前記重錘固定部に接合され前記筒状の支持部によって一部が囲まれる重錘と、
前記筒状の支持部に接合された筒状の台座とを具備する半導体加速度センサにおいて、
前記重錘は、前記重錘固定部の中心を通り前記可撓部が延びる方向と直交する方向に延びる中心線上に中心が位置するように前記重錘固定部に固定された本体部と、前記本体部から前記支持部の内周面に向かって突出する１以上の突出部とを具備し、
前記支持部の内周面の形状及び寸法、前記複数の突出部の形状及び寸法並びに前記台座の形状及び寸法は、前記重錘が前記中心線に沿って前記可撓部から離れる方向に所定量変位したときには前記複数の突出部と前記台座の一部とが当接し、前記重錘が前記中心線に沿って前記可撓部側に所定量変位したときには前記複数の突出部が前記内周面に当接し、前記重錘が前記中心線と直交する方向に所定量変位したときには前記複数の突出部の一部が前記内周面に当接するように定められていることを特徴とする半導体加速度センサ。A weight fixing portion is located at the center, a cylindrical support portion is located outside the center portion, and an acceleration sensor element is formed between the weight fixing portion and the support portion. An acceleration sensor body having a flexible part,
A weight joined to the weight fixing part and partially surrounded by the cylindrical support part;
In a semiconductor acceleration sensor comprising a cylindrical pedestal joined to the cylindrical support,
The weight is fixed to the weight fixing part so that the center is located on a center line extending in a direction orthogonal to the direction in which the flexible part extends through the center of the weight fixing part, One or more projecting portions projecting from the main body portion toward the inner peripheral surface of the support portion,
The shape and size of the inner peripheral surface of the support portion, the shape and size of the plurality of protrusions, and the shape and size of the pedestal are predetermined amounts in the direction in which the weight is separated from the flexible portion along the center line. When displaced, the plurality of protrusions and a part of the pedestal come into contact with each other, and when the weight is displaced by a predetermined amount along the center line toward the flexible part, the plurality of protrusions become the inner peripheral surface. And a portion of the plurality of protrusions is in contact with the inner peripheral surface when the weight is displaced by a predetermined amount in a direction perpendicular to the center line. Sensor. 前記重錘は前記重錘固定部に熱硬化性接着剤を介して接合され、前記台座はガラス材料により形成され、且つ前記台座と前記支持部とは前記熱硬化性接着剤の硬化温度よりも高い加熱温度を伴う陽極接合により接合されており、
前記１以上の突出部は複数の突出部からなり、
前記台座の内周部の形状は、前記重錘が前記重錘固定部に接合される際に、前記重錘の前記複数の突出部の通過を許容し、且つ前記支持部の内部に前記複数の突出部が入った状態で前記中心線を中心にして前記重錘が所定の角度回転させられた状態で前記複数の突出部の通過を阻止し得る形状に定められている請求項１に記載の半導体加速度センサ。The weight is joined to the weight fixing part via a thermosetting adhesive, the pedestal is formed of a glass material, and the pedestal and the support part are higher than the curing temperature of the thermosetting adhesive. Joined by anodic bonding with high heating temperature,
The one or more protrusions include a plurality of protrusions,
The shape of the inner peripheral portion of the pedestal is such that when the weight is joined to the weight fixing portion, the plurality of protrusions of the weight are allowed to pass through, and the plurality of protrusions are provided inside the support portion. 2. The shape according to claim 1, wherein the plurality of projecting portions can be prevented from passing when the weight is rotated by a predetermined angle around the center line in a state where the projecting portions are inserted. Semiconductor acceleration sensor. 中心部に重錘固定部が位置し、前記中心部の外側に筒状の支持部が位置し、前記重錘固定部と前記支持部との間に加速度センサ素子が形成された可撓性を有する可撓部を備えた加速度センサ本体と、
前記重錘固定部の中心を通り前記可撓部が延びる方向と直交する方向に延びる中心線上に中心が位置するように前記重錘固定部に接合され前記筒状の支持部によって一部が囲まれる重錘と、
前記筒状の支持部に接合された筒状の台座とを具備する半導体加速度センサにおいて、
前記支持部の内周面は、前記台座から前記可撓部に向うにしたがって、前記中心線に近づくように傾斜しており、
前記台座の前記可撓部側に位置する上面は、前記支持部に接合される接合面と、前記接合面の内側に位置し且つ前記内周面との間に鋭角を形成するように前記中心線に向かって延びる露出面とを有しており、
前記重錘は、前記重錘固定部に接合される本体部と、前記本体部から前記内周面と前記露出面との間の間隙内に突出して、前記重錘が前記可撓部側に所定量変位したときに前記内周面と当接する第１の当接部と前記台座側に所定量変位したときに前記露出面と当接する第２の当接部とを有する１以上の突出部とを有しており、
前記支持部の前記内周面と前記第１の当接部とにより前記重錘が前記可撓部側及び前記中心線を中心とする放射方向に変位する変位量の範囲を規制する第１のストッパ構造が構成され、
前記台座の前記露出面と前記第２の当接部とにより前記重錘が前記台座側に変位する変位量の範囲を規制する第２のストッパ構造が構成されていることを特徴とする半導体加速度センサ。A weight fixing portion is located at the center, a cylindrical support portion is located outside the center portion, and an acceleration sensor element is formed between the weight fixing portion and the support portion. An acceleration sensor body having a flexible part,
Part of the weight fixing portion is joined to the weight fixing portion so that the center is positioned on a center line extending in a direction orthogonal to the direction in which the flexible portion extends through the center of the weight fixing portion, and a part thereof is surrounded by the cylindrical support portion. A weight,
In a semiconductor acceleration sensor comprising a cylindrical pedestal joined to the cylindrical support,
The inner peripheral surface of the support part is inclined so as to approach the center line as it goes from the pedestal toward the flexible part,
The upper surface of the pedestal located on the flexible part side has the center so as to form an acute angle between the joint surface joined to the support part and the inner peripheral surface located inside the joint surface. An exposed surface extending toward the line,
The weight protrudes into a gap between the inner peripheral surface and the exposed surface from the main body portion joined to the weight fixing portion and the inner peripheral surface, and the weight moves toward the flexible portion side. One or more protrusions having a first contact portion that contacts the inner peripheral surface when displaced by a predetermined amount and a second contact portion that contacts the exposed surface when displaced by a predetermined amount toward the pedestal side And
A first range that regulates a range of a displacement amount in which the weight is displaced in a radial direction centering on the flexible part side and the center line by the inner peripheral surface of the support part and the first contact part. Stopper structure is configured,
A semiconductor acceleration, wherein the exposed surface of the pedestal and the second contact portion constitute a second stopper structure that regulates a range of a displacement amount by which the weight is displaced toward the pedestal. Sensor. 前記重錘は前記重錘固定部に熱硬化性接着剤を介して接合され、前記台座はガラス材料により形成され、且つ前記台座と前記支持部とは前記熱硬化性接着剤の硬化温度よりも高い加熱温度を伴う陽極接合により接合されており、
前記１以上の突出部は複数の突出部からなり、
前記台座の内周部の形状は、前記重錘が前記重錘固定部に接合される際に、前記重錘の前記複数の突出部の通過を許容し、且つ前記支持部の内部に前記複数の突出部が入った状態で前記中心線を中心にして前記重錘が所定の角度回転させられると、前記複数の突出部の前記第２の当接部が前記露出面と対向するように定められている請求項３に記載の半導体加速度センサ。The weight is joined to the weight fixing part via a thermosetting adhesive, the pedestal is formed of a glass material, and the pedestal and the support part are higher than the curing temperature of the thermosetting adhesive. Joined by anodic bonding with high heating temperature,
The one or more protrusions include a plurality of protrusions,
The shape of the inner peripheral portion of the pedestal is such that when the weight is joined to the weight fixing portion, the plurality of protrusions of the weight are allowed to pass through, and the plurality of protrusions are provided inside the support portion. When the weight is rotated by a predetermined angle around the center line in a state where the protruding portion is inserted, the second contact portion of the plurality of protruding portions is set to face the exposed surface. The semiconductor acceleration sensor according to claim 3. 前記複数の突出部が、前記重錘の前記本体部の外周部に前記中心線を中心にして９０°ずつ離れた位置に前記本体部と一体に設けられた４つの前記突出部からなる請求項１〜４のいずれか１つに記載の半導体加速度センサ。  The plurality of protrusions include four protrusions integrally provided with the main body at positions apart from each other by 90 ° around the center line on the outer periphery of the main body of the weight. The semiconductor acceleration sensor as described in any one of 1-4. 前記支持部の内周面は、切頭角錐形の内部空間の外周面に倣うように、実質的に同形状の４つの台形状の傾斜面が環状に組み合わされて構成されており、
前記突出部は、前記中心線を中心にして９０°ずつ間隔をあけて放射方向に延びる４本の仮想放射線上に頂点が位置するように突出しており、
前記頂点は放射方向に向かって凸となる湾曲面の一部によって構成されている請求項５に記載の半導体加速度センサ。The inner peripheral surface of the support portion is configured by annularly combining four trapezoidal inclined surfaces having substantially the same shape so as to follow the outer peripheral surface of the truncated pyramid internal space,
The protruding portion protrudes so that apexes are located on four virtual radiations extending in the radial direction with an interval of 90 ° about the center line,
The semiconductor acceleration sensor according to claim 5, wherein the vertex is constituted by a part of a curved surface that is convex in a radial direction. 中心部に重錘固定部が位置し、前記中心部の外側に筒状の支持部が位置し、前記重錘固定部と前記支持部との間に可撓性を有する可撓部を備えた加速度センサ本体と、
前記可撓部に形成された拡散抵抗により構成されて相互に直交するＸ軸方向、Ｙ軸方向及びＺ軸方向の三軸の加速度をそれぞれ検出する加速度センサ素子と、
前記重錘固定部の中心を通り前記可撓部が延びる方向と直交する方向に延びる中心線上に中心が位置するように前記重錘固定部に固定され前記筒状の支持部によって一部が囲まれる重錘と、
前記筒状の支持部に接合された筒状の台座とを具備する半導体加速度センサにおいて、
前記支持部の内周面は、切頭角錐形の内部空間の外周面に倣うように、実質的に同形状の４つの台形状の傾斜面が環状に組み合わされて構成されており、
前記台座の前記可撓部側に位置する上面は、前記支持部に接合される接合面と、前記接合面の内側に位置し且つ前記内周面との間に鋭角を形成するように前記中心線に向かって延びる露出面とを有しており、
前記重錘は、前記重錘固定部に固定される本体部と、前記本体部から前記Ｘ軸方向及び前記Ｙ軸方向に向けて前記４つの傾斜面と前記露出面との間にそれぞれ突出して、前記重錘が前記可撓部側に所定量変位したときに前記内周面と当接する第１の当接部と前記台座側に所定量変位したときに前記露出面と当接する第２の当接部とを有する４つの突出部とを有しており、
前記支持部の前記内周面と前記第１の当接部とにより前記重錘が前記可撓部側及び前記中心線を中心とする放射方向に変位する変位量の範囲を規制する第１のストッパ構造が構成され、
前記台座の前記露出面と前記第２の当接部とにより前記重錘が前記台座側に変位する変位量の範囲を規制する第２のストッパ構造が構成されていることを特徴とする半導体加速度センサ。A weight fixing part is located at the center, a cylindrical support part is located outside the center part, and a flexible part having flexibility is provided between the weight fixing part and the support part. An acceleration sensor body;
An acceleration sensor element configured to detect triaxial acceleration in the X-axis direction, the Y-axis direction, and the Z-axis direction, which are configured by diffusion resistors formed in the flexible portion and orthogonal to each other;
A part is surrounded by the cylindrical support part that is fixed to the weight fixing part so that the center is located on a center line extending in a direction orthogonal to the direction in which the flexible part extends through the center of the weight fixing part. A weight,
In a semiconductor acceleration sensor comprising a cylindrical pedestal joined to the cylindrical support,
The inner peripheral surface of the support portion is configured by annularly combining four trapezoidal inclined surfaces having substantially the same shape so as to follow the outer peripheral surface of the truncated pyramid internal space,
The upper surface of the pedestal located on the flexible part side has the center so as to form an acute angle between the joint surface joined to the support part and the inner peripheral surface located inside the joint surface. An exposed surface extending toward the line,
The weight protrudes between the four inclined surfaces and the exposed surface from the main body portion toward the X axis direction and the Y axis direction from the main body portion fixed to the weight fixing portion. A first contact portion that contacts the inner peripheral surface when the weight is displaced by a predetermined amount toward the flexible portion side, and a second contact portion that contacts the exposed surface when the weight is displaced by a predetermined amount toward the pedestal side. Four protrusions having a contact portion,
A first range that regulates a range of a displacement amount in which the weight is displaced in a radial direction centering on the flexible part side and the center line by the inner peripheral surface of the support part and the first contact part. Stopper structure is configured,
A semiconductor acceleration, wherein the exposed surface of the pedestal and the second contact portion constitute a second stopper structure that regulates a range of a displacement amount by which the weight is displaced toward the pedestal. Sensor. 前記重錘は前記重錘固定部に熱硬化性接着剤を介して接合され、前記台座はガラス材料により形成され、且つ前記台座と前記支持部とは前記熱硬化性接着剤の硬化温度よりも高い加熱温度を伴う陽極接合により接合されており、
前記台座の内周面の形状は、前記重錘が前記重錘固定部に接合される際に、前記切頭角錐形の内周面により形成される底面の２つの仮想対角線に対応して前記４つの突出部を位置させた状態で前記重錘の前記複数の突出部の通過を許容し、且つ前記支持部の内部に前記複数の突出部が入った状態で前記中心線を中心にして前記重錘が所定の角度回転させられると、前記複数の突出部の前記第２の当接部が前記露出面と対向するように定められている請求項７に記載の半導体加速度センサ。The weight is joined to the weight fixing part via a thermosetting adhesive, the pedestal is formed of a glass material, and the pedestal and the support part are higher than the curing temperature of the thermosetting adhesive. Joined by anodic bonding with high heating temperature,
The shape of the inner peripheral surface of the pedestal corresponds to the two virtual diagonal lines of the bottom surface formed by the inner peripheral surface of the truncated pyramid when the weight is joined to the weight fixing portion. With the four protrusions positioned, the weight is allowed to pass through the plurality of protrusions, and the plurality of protrusions are inside the support part, and the center line is the center. The semiconductor acceleration sensor according to claim 7, wherein when the weight is rotated by a predetermined angle, the second contact portion of the plurality of protrusions is set to face the exposed surface. 前記突出部は、前記中心線を中心にして９０°ずつ間隔をあけてＸ軸方向及びＹ軸方向の放射方向に延びる４本の仮想放射線上に頂点が位置するように突出しており、
前記頂点は放射方向に向かって凸となる湾曲面の一部によって構成されており、
前記第１の当接部は、前記頂点を含むように形成されている請求項８に記載の半導体加速度センサ。The protruding portion protrudes so that apexes are located on four virtual radiations extending in the X-axis direction and the Y-axis radial direction at intervals of 90 ° around the center line,
The apex is constituted by a part of a curved surface that is convex in the radial direction,
The semiconductor acceleration sensor according to claim 8, wherein the first contact portion is formed to include the apex. 前記第１の当接部及び前記第２の当接部は、前記重錘に加速度が作用していない状態で、前記傾斜面及び前記露出面とそれぞれ平行に延びており、
前記突出部は、前記第１の当接部に連続して延びて前記可撓部に向かうにしたがって前記傾斜面から離れるように傾斜して前記傾斜面に対向する対向傾斜部を更に有している請求項９に記載の半導体加速度センサ。The first contact portion and the second contact portion extend in parallel with the inclined surface and the exposed surface, respectively, in a state where no acceleration acts on the weight.
The protruding portion further includes an opposing inclined portion that extends continuously from the first abutting portion and inclines away from the inclined surface toward the flexible portion and faces the inclined surface. The semiconductor acceleration sensor according to claim 9. 前記台座の内周面は、前記加速度センサ本体と反対側に開口する外側開口部から前記加速度センサ本体側に開口する内側開口部に向うにしたがって、前記中心線に近づくように傾斜している請求項１〜１０のいずれか１つに記載の半導体加速度センサ。  The inner peripheral surface of the pedestal is inclined so as to approach the center line from an outer opening that opens to the opposite side of the acceleration sensor body toward an inner opening that opens to the acceleration sensor body. Item 11. The semiconductor acceleration sensor according to any one of Items 1 to 10. 前記重錘の前記本体部は、前記重錘固定部を囲むように前記領域内に配置されて前記４つの突出部と一体に結合する固定部周囲部を有しており、
前記固定部周囲部には、前記４つの突出部にほぼ隣接する位置に前記可撓部側に開口する４つの凹部が形成されている請求項７〜１１のいずれか１つに記載の半導体加速度センサ。The body portion of the weight has a fixed portion peripheral portion that is disposed in the region so as to surround the weight fixed portion and is integrally coupled to the four protruding portions,
12. The semiconductor acceleration according to claim 7, wherein four concave portions that are open toward the flexible portion are formed at positions substantially adjacent to the four projecting portions around the fixed portion. Sensor. 中心部に重錘固定部が位置し、前記中心部の外側に筒状の支持部が位置し、前記重錘固定部と前記支持部との間に加速度センサ素子が形成された可撓性を有する可撓部を備えた加速度センサ本体と、
前記重錘固定部の中心を通り前記可撓部が延びる方向と直交する方向に延びる中心線上に中心が位置するように前記重錘固定部に熱硬化性接着剤を介して接合される本体部と、前記本体部から前記支持部の内周面に向かって突出する複数の突出部とを有する重錘と、
前記筒状の支持部に前記熱硬化性接着剤の硬化温度よりも高い加熱温度を伴う陽極接合により接合される筒状の台座とを具備し、
前記支持部の内周面は、前記台座から前記可撓部に向うにしたがって、前記中心線に近づくように傾斜しており、
前記台座の前記可撓部側に位置する上面は、前記支持部に接合される接合面と、前記接合面の内側に位置し且つ前記内周面との間に鋭角を形成するように前記中心線に向かって延びる露出面とを有しており、
前記重錘は、前記重錘固定部に接合される本体部と、前記本体部から前記内周面と前記露出面との間の間隙内に突出して、前記重錘が前記可撓部側に所定量変位したときに前記内周面と当接する第１の当接部と前記台座側に所定量変位したときに前記露出面と当接する第２の当接部とを有する複数の突出部とを有している半導体加速度センサの製造方法において、
前記加速度センサ本体の前記支持部と前記台座とを陽極接合により接合し、
前記加速度センサ本体の前記重錘固定部及び前記重錘の両接合部分の少なくとも一方に前記熱硬化性接着剤を塗布し、
前記複数の突出部を、前記筒状の台座の中空部を介して前記支持部の内部に挿入し、
前記挿入後に、前記中心線を中心にして前記重錘を所定角度回転して、前記複数の突出部の前記第２の当接部を前記露出面と対向させ、
前記重錘と前記重錘固定部とを当接した状態で前記接着剤を硬化させて、前記重錘と前記重錘固定部とを接合する半導体加速度センサの製造方法。A weight fixing portion is located at the center, a cylindrical support portion is located outside the center portion, and an acceleration sensor element is formed between the weight fixing portion and the support portion. An acceleration sensor body having a flexible part,
A main body part joined to the weight fixing part via a thermosetting adhesive so that the center is located on a center line extending in a direction orthogonal to the direction in which the flexible part extends through the center of the weight fixing part. A weight having a plurality of projecting portions projecting from the main body portion toward the inner peripheral surface of the support portion;
A cylindrical pedestal bonded to the cylindrical support portion by anodic bonding with a heating temperature higher than the curing temperature of the thermosetting adhesive;
The inner peripheral surface of the support part is inclined so as to approach the center line as it goes from the pedestal toward the flexible part,
The upper surface of the pedestal located on the flexible part side has the center so as to form an acute angle between the joint surface joined to the support part and the inner peripheral surface located inside the joint surface. An exposed surface extending toward the line,
The weight protrudes into a gap between the inner peripheral surface and the exposed surface from the main body portion joined to the weight fixing portion and the inner peripheral surface, and the weight moves toward the flexible portion side. A plurality of protrusions having a first contact portion that contacts the inner peripheral surface when displaced by a predetermined amount and a second contact portion that contacts the exposed surface when displaced by a predetermined amount toward the pedestal side; In the manufacturing method of the semiconductor acceleration sensor having
Bonding the support portion of the acceleration sensor body and the pedestal by anodic bonding,
Applying the thermosetting adhesive to at least one of the joints of the weight fixing part and the weight of the acceleration sensor body,
The plurality of protrusions are inserted into the support portion through the hollow portion of the cylindrical pedestal,
After the insertion, the weight is rotated by a predetermined angle around the center line, and the second contact portions of the plurality of protrusions are opposed to the exposed surface,
A method of manufacturing a semiconductor acceleration sensor, wherein the adhesive is cured in a state where the weight and the weight fixing portion are in contact with each other, and the weight and the weight fixing portion are joined.
JP2002365863A 2002-12-17 2002-12-17 Semiconductor acceleration sensor and manufacturing method thereof Expired - Fee Related JP4015014B2 (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP2002365863A JP4015014B2 (en) 2002-12-17 2002-12-17 Semiconductor acceleration sensor and manufacturing method thereof
AU2003289410A AU2003289410A1 (en) 2002-12-17 2003-12-17 Semiconductor acceleration sensor and mehod of producing the same
PCT/JP2003/016200 WO2004055523A1 (en) 2002-12-17 2003-12-17 Semiconductor acceleration sensor and mehod of producing the same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2002365863A JP4015014B2 (en) 2002-12-17 2002-12-17 Semiconductor acceleration sensor and manufacturing method thereof

Publications (2)

Publication Number Publication Date
JP2004198207A JP2004198207A (en) 2004-07-15
JP4015014B2 true JP4015014B2 (en) 2007-11-28

Family

ID=32588285

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2002365863A Expired - Fee Related JP4015014B2 (en) 2002-12-17 2002-12-17 Semiconductor acceleration sensor and manufacturing method thereof

Country Status (3)

Country Link
JP (1) JP4015014B2 (en)
AU (1) AU2003289410A1 (en)
WO (1) WO2004055523A1 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20150084649A (en) * 2011-11-09 2015-07-22 로베르트 보쉬 게엠베하 Proof mass positioning features having curved contact surfaces

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3290047B2 (en) * 1995-03-15 2002-06-10 松下電工株式会社 Acceleration sensor and method of manufacturing the same
JPH1048243A (en) * 1996-08-08 1998-02-20 Akebono Brake Ind Co Ltd Acceleration sensor and manufacture thereof

Also Published As

Publication number Publication date
WO2004055523A1 (en) 2004-07-01
AU2003289410A1 (en) 2004-07-09
JP2004198207A (en) 2004-07-15

Similar Documents

Publication Publication Date Title
EP1427988B1 (en) Vibratory gyroscopic rate sensor
JP5186885B2 (en) Mask pattern correction method and acceleration sensor and angular velocity sensor manufacturing method using the same
JP4015014B2 (en) Semiconductor acceleration sensor and manufacturing method thereof
US11898845B2 (en) Micromachined multi-axis gyroscopes with reduced stress sensitivity
KR20180045811A (en) Inertial sensor
JP4605736B2 (en) Micromechanism rotation rate sensor
JPH09304206A (en) Semiconductor pressure transducer
US10658262B2 (en) Pin flexure array
JP2006208272A (en) Semiconductor multiaxial acceleration sensor
JP4224466B2 (en) Semiconductor sensor and manufacturing method thereof
JP5100396B2 (en) Manufacturing method of sensor body for semiconductor sensor
JPH08327656A (en) Semiconductor acceleration sensor
WO2013089079A1 (en) Acceleration sensor
JP4422395B2 (en) Manufacturing method of semiconductor acceleration sensor
JP4014888B2 (en) Semiconductor acceleration sensor and manufacturing method thereof
JP4913408B2 (en) Semiconductor sensor
KR102528214B1 (en) 3-axis MEMS acceleration sensor based on single mass
JP2006105618A (en) Triaxial acceleration sensor and its manufacturing method
KR102534682B1 (en) 3-axis acceleration sensor based on MEMS
US20240003935A1 (en) Physical Quantity Sensor And Inertial Measurement Unit
JP2006090975A (en) Three-axis acceleration sensor and its manufacturing method
JP5065356B2 (en) Semiconductor acceleration sensor
JP4681701B2 (en) Acceleration sensor
JP4464597B2 (en) Semiconductor acceleration sensor
JP2024027018A (en) Sensor and electronic apparatus

Legal Events

Date Code Title Description
A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20070508

A521 Written amendment

Free format text: JAPANESE INTERMEDIATE CODE: A523

Effective date: 20070709

TRDD Decision of grant or rejection written
A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20070828

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20070912

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100921

Year of fee payment: 3

R150 Certificate of patent or registration of utility model

Free format text: JAPANESE INTERMEDIATE CODE: R150

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110921

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110921

Year of fee payment: 4

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120921

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120921

Year of fee payment: 5

FPAY Renewal fee payment (event date is renewal date of database)

Free format text: PAYMENT UNTIL: 20130921

Year of fee payment: 6

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

LAPS Cancellation because of no payment of annual fees