JPS62259030A - Semiconductor pressure sensor - Google Patents

Semiconductor pressure sensor

Info

Publication number
JPS62259030A
JPS62259030A JP10275186A JP10275186A JPS62259030A JP S62259030 A JPS62259030 A JP S62259030A JP 10275186 A JP10275186 A JP 10275186A JP 10275186 A JP10275186 A JP 10275186A JP S62259030 A JPS62259030 A JP S62259030A
Authority
JP
Japan
Prior art keywords
pedestal
stem
pressure
pressure sensor
pressure medium
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10275186A
Other languages
Japanese (ja)
Inventor
Akihiro Aoi
昭博 青井
Arimasa Abe
安部 有正
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP10275186A priority Critical patent/JPS62259030A/en
Publication of JPS62259030A publication Critical patent/JPS62259030A/en
Pending legal-status Critical Current

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  • Measuring Fluid Pressure (AREA)

Abstract

PURPOSE:To measure the stable pressure without being influenced by a pressure medium by providing a pedestal having a through hole at the center connected with the under surface of a silicon diaphragm, a stem, etc., connected with the under surface of the pedestal via a solder pellet. CONSTITUTION:The titled sensor is provided with the pedestal 11 having the through hole at the center connected with the under surface of the silicon diaphragm 10 and the stem 15 connected with the under surface of the pedestal 11 via the solder pellet 14. Moreover, the stem 15 is airtightly connected with the pedestal 11 by the soldering. Then, when the pressure medium is introduced into a pressure introduction pipe 18, since the pedestal 11 and the stem 15 are sealed by the soldering, the pressure medium is brought into contact with a solder layer. Accordingly, the pressure medium is kept airtight by the solder layer and the diaphragm 10 is bent via the pipe 18, by which its pressure is measured. In this way, the pressure can be stably measured without being influenced by the pressure medium.

Description

【発明の詳細な説明】 〔発明の分野〕 本発明は半導体圧力センサに関し、特に安定した検出出
力が得られる半導体圧力センサに関するものである。
DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a semiconductor pressure sensor, and more particularly to a semiconductor pressure sensor that provides a stable detection output.

〔発明の概要〕[Summary of the invention]

本発明による半導体圧力センサは、抵抗が形成されたダ
イヤフラム型のシリコンチップに取付けられる台座の下
面に金属膜を形成すると共に、台座を保持するステムと
の間にはんだペレットを設は焼成することによって台座
とステムとをはんだ付けして気密に構成したものである
The semiconductor pressure sensor according to the present invention is produced by forming a metal film on the lower surface of a pedestal that is attached to a diaphragm-type silicon chip on which a resistor is formed, and by placing and baking a solder pellet between the pedestal and the stem that holds the pedestal. The pedestal and stem are soldered to form an airtight structure.

〔従来技術とその問題点〕[Prior art and its problems]

(従来技術) 圧力変化に暴づくピエゾ抵抗効果を利用したシリコンダ
イヤフラム型の半導体圧力センサにおいては、例えば特
開昭55−43819号に示されているように、取付部
の温度変化に基づく圧力変動を防止するためにシリコン
半導体又はホウケイ酸ガラス等の台座が設けられる。第
4図及び第5図は従来の半導体圧力センサを示す断面図
であって、シリコンダイヤフラムlの下部に陽極接合法
によって立方体形状で中心に貫通孔を有する台座2が取
付けられる。そしてこの台座2は金属製のステム3内に
固定される。ステム3は下面に台座20貫通孔と連通ず
る圧力導入パイプ4と複数の接続ビン5を有している。
(Prior art) In a silicon diaphragm type semiconductor pressure sensor that utilizes a piezoresistance effect that is exposed to pressure changes, pressure fluctuations based on temperature changes at the mounting part are known, for example, as shown in Japanese Patent Application Laid-Open No. 55-43819. In order to prevent this, a pedestal made of silicon semiconductor or borosilicate glass is provided. 4 and 5 are cross-sectional views showing a conventional semiconductor pressure sensor, in which a cubic-shaped pedestal 2 having a through hole in the center is attached to the lower part of a silicon diaphragm 1 by an anodic bonding method. This pedestal 2 is fixed within a metal stem 3. The stem 3 has a pressure introduction pipe 4 communicating with the through hole of the pedestal 20 and a plurality of connection bottles 5 on the lower surface.

接続ピン5はシリコンダイヤフラム1の電極部とワイヤ
ボンディングによって接続されている。そして台座2と
ステム3は第4図に示すように圧力導入部からの圧力が
外部に漏れないように0リング6によって気密に構成さ
れるか、又は第5図に示すようにを機接着剤7によって
ステム3内に接着して半導体圧力センサが構成されてい
る。
The connecting pin 5 is connected to an electrode portion of the silicon diaphragm 1 by wire bonding. The pedestal 2 and stem 3 are made airtight with an O-ring 6 to prevent the pressure from the pressure introduction part from leaking to the outside, as shown in FIG. 4, or they are glued together as shown in FIG. A semiconductor pressure sensor is configured by adhering inside the stem 3 by 7.

(発明が解決しようとする問題点) このように従来の半導体圧力センサでは、台座2はゴム
性のOリング6又は有機接着剤7によってステム3上に
固定される。そして0リング6や有機接着剤7の部分は
圧力導入パイプ4を通って導かれる圧力媒体に接するた
め、圧力媒体に侵されて劣化する可能性があるという欠
点がある。従って測定しようとする圧力媒体の種類によ
ってOリング6や有機接着剤7の種類を選別する必要が
あった。又経年変化によって劣化し易く安定して検出出
力を得ることが困難であるという問題点もあった・ 〔発明の目的〕 本発明はこのような従来の半導体圧力センサの問題点に
鑑みてなされたものであって、Oリングや有機接着剤に
よって台座をステム上に取付けることなく圧力媒体の影
響を受けずに安定して圧力を測定することができるよう
にすることを技術的課題とする。
(Problems to be Solved by the Invention) As described above, in the conventional semiconductor pressure sensor, the base 2 is fixed onto the stem 3 by the rubber O-ring 6 or the organic adhesive 7. Since the O-ring 6 and the organic adhesive 7 come into contact with the pressure medium introduced through the pressure introduction pipe 4, there is a drawback that they may be attacked by the pressure medium and deteriorate. Therefore, it is necessary to select the type of O-ring 6 and organic adhesive 7 depending on the type of pressure medium to be measured. In addition, there was also the problem that it deteriorated easily over time and it was difficult to obtain a stable detection output. [Object of the Invention] The present invention was made in view of the problems of conventional semiconductor pressure sensors. The technical problem is to make it possible to stably measure pressure without being affected by a pressure medium without attaching a pedestal to the stem using an O-ring or organic adhesive.

〔発明の構成と効果〕[Structure and effects of the invention]

(構成) 本発明は抵抗が形成されたシリコンダイヤフラム(l 
O)を有する半導体圧力センサであって、第1図に示す
ように、シリコンダイヤフラム(10)の下面に接続さ
れた中心に貫通孔(12)を有する台座(11)と、台
座(11)の下面にはんだペレット(14)を介して接
続されたステム(15)とを有し、ステム(15)と台
座(11)    “をはんだ付けによって気密に接続
したことを特徴とするものである。
(Structure) The present invention uses a silicon diaphragm (l) on which a resistor is formed.
As shown in FIG. 1, the semiconductor pressure sensor has a pedestal (11) having a through hole (12) in the center connected to the lower surface of a silicon diaphragm (10), and It has a stem (15) connected to the lower surface via a solder pellet (14), and is characterized in that the stem (15) and the pedestal (11) are hermetically connected by soldering.

(作用) このような特徴を有する本発明によれば、圧力導入パイ
プ(18)に圧力媒体を導いた際には台座(11)とス
テム(15)とのシールがはんだ付けによって行われて
いるため、圧力媒体がはんだ層に接する。そしてはんだ
層によって圧力媒体が気密に保たれ圧力導入パイプ(1
8)を通じてシリコンダイヤフラム(lO)が湾曲する
ことによってその圧力が測定される。
(Function) According to the present invention having such characteristics, when the pressure medium is introduced into the pressure introduction pipe (18), the pedestal (11) and the stem (15) are sealed by soldering. Therefore, the pressure medium comes into contact with the solder layer. The pressure medium is kept airtight by the solder layer, and the pressure introduction pipe (1
8) through which the pressure is measured by bending the silicon diaphragm (lO).

(効果) そのため本発明によれば、台座とステムとのシールをは
んだ付けによって行っているため圧力媒体の影響を受は
難く耐食性を向上させることができる。又台座とステム
間のはんだペレットは薄くできるため、はんだ層の熱膨
張がシリコンダイヤフラムに悪影響を及ぼすことが少な
く、温度特性を向上させることができる。更に0リング
や有機接着剤のシールに比べて耐圧力性能が向上すると
いう効果が得られる。
(Effects) Therefore, according to the present invention, since the pedestal and the stem are sealed by soldering, they are hardly affected by the pressure medium and corrosion resistance can be improved. Furthermore, since the solder pellet between the pedestal and the stem can be made thin, the thermal expansion of the solder layer has less of an adverse effect on the silicon diaphragm, and the temperature characteristics can be improved. Furthermore, the pressure resistance performance is improved compared to seals using O-rings or organic adhesives.

(実施例の説明) 第2図は本発明の一実施例による半導体圧力センサに用
いられる台座とはんだペレットを示す側面図であり、第
1図はこれらの台座を用いて形成された半導体圧力セン
サを示す側面図である。前述のように半立体圧力センサ
は抵抗によるブリッジ回路が形成されたシリコンダイヤ
フラム10の湾曲に基づく抵抗値の変化によって圧力を
検出するようにしており、圧力媒体による圧力を除く種
々の原因でシリコンダイヤフラム10への応力変化を少
なくするため、シリコンダイヤフラム10の下方にシリ
コンダイヤフラム10と同一の熱膨張係数を有するシリ
コン半導体又はホウケイ酸ガラス(パイレックスガラス
)から成る台座11が取付けられる。台座11は第2図
に示すように立方体形状を有し中心に貫通孔12が設け
られている。そして台座11の上面11aはシリコンダ
イヤフラム10を接続するために鏡面状に形成される。
(Description of Embodiments) FIG. 2 is a side view showing a pedestal and solder pellets used in a semiconductor pressure sensor according to an embodiment of the present invention, and FIG. 1 is a side view of a semiconductor pressure sensor formed using these pedestals. FIG. As mentioned above, the semi-stereoscopic pressure sensor detects pressure by the change in resistance value based on the curvature of the silicon diaphragm 10 in which a bridge circuit is formed by resistance. In order to reduce stress changes to the silicon diaphragm 10, a pedestal 11 made of silicon semiconductor or borosilicate glass (Pyrex glass) having the same thermal expansion coefficient as the silicon diaphragm 10 is attached below the silicon diaphragm 10. As shown in FIG. 2, the pedestal 11 has a cubic shape and has a through hole 12 provided in the center. The upper surface 11a of the pedestal 11 is formed into a mirror surface in order to connect the silicon diaphragm 10 thereto.

第3図はシリコンダイヤフラム10と台座11を接続す
る陽極接合法を示すものであって、400℃程度の高温
下でシリコンダイヤフラム10と台座11とを重ね合わ
せその両端に高圧(400〜1000■)の直流電圧を
印加して加熱することによってシリコンダイヤフラム1
0と台座11とを一体に接続する。又台座11の下面1
1bには金属ステムとの接着を行うために恨(Ag )
、m・パラジウム(Ag−Pd ) 、 i艮・白金(
Ag−PL)等のペースト13をスクリーン印刷して焼
成している。
FIG. 3 shows the anodic bonding method for connecting the silicon diaphragm 10 and the pedestal 11, in which the silicon diaphragm 10 and the pedestal 11 are stacked together at a high temperature of about 400°C, and high pressure (400 to 1000 cm) is applied to both ends. Silicon diaphragm 1 is heated by applying a DC voltage of
0 and the pedestal 11 are integrally connected. Also, the bottom surface 1 of the pedestal 11
Ag (Ag) is attached to 1b for adhesion with the metal stem.
, m-palladium (Ag-Pd), i-platinum (Ag-Pd),
A paste 13 such as Ag-PL) is screen printed and fired.

そしてこの台座11と同一の横断面形状で中心に貫通孔
を有する、例えば0,1w程度の薄いはんだペレット1
4を挟んで第1図に示すようにステム15上に台座11
を固定して全体をはんだの融点以上に加熱する。そうす
れば台座11をステム15にはんだ付けにより気密に接
続することができる。そしてシリコンダイヤフラム10
の電極部を金等のワイヤ17によってステム15の電極
16a、16bに接続して半導体圧力センサを構成する
A thin solder pellet 1 of about 0.1w, for example, has the same cross-sectional shape as this pedestal 11 and has a through hole in the center.
A pedestal 11 is placed on the stem 15 as shown in FIG.
Fix it and heat the whole thing above the melting point of the solder. In this way, the pedestal 11 can be hermetically connected to the stem 15 by soldering. and silicon diaphragm 10
A semiconductor pressure sensor is constructed by connecting the electrode portion of the stem 15 to the electrodes 16a and 16b of the stem 15 using a wire 17 made of gold or the like.

こうすれば台座11とステム15間ははんだ付けによっ
て気密に接続されるため、圧力導入パイプ18から導か
れる圧力媒体の影響を受は難くなる。又はんだペレット
14を十分薄くすることができるので、その熱膨張によ
る影響をほとんどシリコンダイヤフラム10に伝えるこ
とがなくなる。
In this way, the pedestal 11 and the stem 15 are connected airtightly by soldering, so that they are less likely to be affected by the pressure medium introduced from the pressure introduction pipe 18. Since the solder pellet 14 can be made sufficiently thin, the influence of its thermal expansion is hardly transmitted to the silicon diaphragm 10.

更にOリングや接着剤に比べて耐圧力性能を向上させる
ことができる。
Furthermore, pressure resistance performance can be improved compared to O-rings and adhesives.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明の一実施例による半導体圧力センサの側
面図、第2図はこの半導体圧力センサに用いる台座とは
んだペレットの形状を示す斜視図、第3図は台座とシリ
コンチップの陽掻接合法による接続状態を示す図、第4
図及び第5図は従来の半導体圧力センサの一例を示す断
面図である。 1.10−−−−−シリコンダイヤフラム  2.11
−・・・台座  3.15・〜−−−−−ステム  1
3−・・・・・・ペースト  14−・−はんだペレッ
ト 特許出願人   立石電機株式会社 代理人 弁理士 岡本宜喜(他1名) 第1図 1o−−−−−−シリコンデイヤつつム11− ・−一
一台度 14−−−−−− L電んた°へ0し、ト15−−−−
−−又千ム 第2図 1a 第3図
FIG. 1 is a side view of a semiconductor pressure sensor according to an embodiment of the present invention, FIG. 2 is a perspective view showing the shapes of a pedestal and a solder pellet used in this semiconductor pressure sensor, and FIG. 3 is a schematic diagram of the pedestal and silicon chip. Diagram showing the connection state by the joining method, No. 4
1 and 5 are cross-sectional views showing an example of a conventional semiconductor pressure sensor. 1.10---Silicon diaphragm 2.11
---Pedestal 3.15・〜----Stem 1
3-...Paste 14--Solder pellet patent applicant Tateishi Electric Co., Ltd. agent Patent attorney Yoshiki Okamoto (and one other person) - ・-11 units 14-------- L power to 0, 15-----
--Matasenmu Figure 2 1a Figure 3

Claims (1)

【特許請求の範囲】[Claims] (1)抵抗が形成されたシリコンダイヤフラムを有する
半導体圧力センサであって、 前記シリコンダイヤフラムの下面に接続された中心に貫
通孔を有する台座と、 前記台座の下面にはんだペレットを介して接続されたス
テムとを有し、ステムと台座をはんだ付けによって気密
に接続したことを特徴とする半導体圧力センサ。
(1) A semiconductor pressure sensor having a silicon diaphragm with a resistor formed thereon, comprising: a pedestal having a through hole in the center connected to the lower surface of the silicon diaphragm; and a pedestal connected to the lower surface of the pedestal via a solder pellet. 1. A semiconductor pressure sensor comprising a stem, the stem and the pedestal being hermetically connected by soldering.
JP10275186A 1986-05-02 1986-05-02 Semiconductor pressure sensor Pending JPS62259030A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10275186A JPS62259030A (en) 1986-05-02 1986-05-02 Semiconductor pressure sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10275186A JPS62259030A (en) 1986-05-02 1986-05-02 Semiconductor pressure sensor

Publications (1)

Publication Number Publication Date
JPS62259030A true JPS62259030A (en) 1987-11-11

Family

ID=14335920

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10275186A Pending JPS62259030A (en) 1986-05-02 1986-05-02 Semiconductor pressure sensor

Country Status (1)

Country Link
JP (1) JPS62259030A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120067131A1 (en) * 2009-05-11 2012-03-22 Thomas Moelkner High pressure sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120067131A1 (en) * 2009-05-11 2012-03-22 Thomas Moelkner High pressure sensor

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