JP5238343B2 - Glass sealed thermistor for temperature sensor - Google Patents

Glass sealed thermistor for temperature sensor Download PDF

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JP5238343B2
JP5238343B2 JP2008122148A JP2008122148A JP5238343B2 JP 5238343 B2 JP5238343 B2 JP 5238343B2 JP 2008122148 A JP2008122148 A JP 2008122148A JP 2008122148 A JP2008122148 A JP 2008122148A JP 5238343 B2 JP5238343 B2 JP 5238343B2
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glass
temperature sensor
thermistor
cylindrical insulator
recess
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牡司 大坂
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Ohizumi Mfg Co Ltd
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Description

本発明は、二穴の筒状碍子を使用した温度センサ用のガラス封止型サーミスタに関する。   The present invention relates to a glass-sealed thermistor for a temperature sensor using a two-hole cylindrical insulator.

ガラス封止型サーミスタは、図４に示すようにサーミスタ素子１１のチップ両面に形成した素子電極１２に固定用接着電極を盛り付け、固定用接着電極に引出し用リード線１３の一部を埋め込み、リード１３線の一部を含んでサーミスタ素子１１の全体をガラス材１４で封止したものであるが、水回りの温度センサには、図５に示すようにガラス封止型サーミスタのリード線１３の出口をセラミックタブレット１５で機械的に補強することによって、電気絶縁性と機械的強度を向上させたものが用いられる。   As shown in FIG. 4, the glass-sealed thermistor is provided with a fixing adhesive electrode on the element electrode 12 formed on both sides of the chip of the thermistor element 11, and a part of the lead wire 13 is embedded in the fixing adhesive electrode. The entire thermistor element 11 including a part of the 13 wires is sealed with a glass material 14, but the temperature sensor around the water has a lead wire 13 of the glass sealed thermistor as shown in FIG. The outlet is mechanically reinforced with a ceramic tablet 15 to improve electrical insulation and mechanical strength.

従来、サーミスタ素子１１の封止には、管ガラスが用いられており、溶融させた管ガラス内にサーミスタ素子を封入するため、ガラスの偏肉の発生が避けられず、生産された個々の温度センサについてみれば、同一形状に仕上げることができないという問題があった。   Conventionally, tube glass is used for sealing the thermistor element 11, and since the thermistor element is enclosed in the molten tube glass, the occurrence of uneven thickness of the glass is inevitable, and the individual temperatures produced As for the sensor, there was a problem that it could not be finished in the same shape.

また、管ガラスは、専ら市販品が使用されてきたが、市場にはメーカーの標準品しかないため、温度センサの使用目的にあわせてガラスの種類、材質を自由に選択することができず、強いて材質を選ぶときには、種類、材質を指定してメーカーに管ガラスの製造を特別に依頼しなければならず、管ガラスが高価となり、ひいては温度センサの製品のコスト高になるという問題があった。
特開平８−１６７５０２号公報 特開平１１−８３６４１号公報 In addition, commercially available glass tubes have been used exclusively, but since there are only manufacturers' standard products on the market, the type and material of the glass cannot be freely selected according to the purpose of use of the temperature sensor. When choosing a material, the type and material must be specified and the manufacturer must be specially requested to manufacture the tube glass. This has the problem that the tube glass is expensive and, in turn, the cost of the temperature sensor product is high. .
JP-A-8-167502 Japanese Patent Laid-Open No. 11-83641

解決しようとする問題点は、サーミスタ素子の封止に、管ガラスを用いるときには、ガラスの偏肉の発生が避けられず、温度センサを同一形状に仕上げることができないという点である。   The problem to be solved is that when tube glass is used for sealing the thermistor element, the occurrence of uneven thickness of the glass cannot be avoided, and the temperature sensor cannot be finished in the same shape.

本発明は、筒状の二穴の筒状碍子の筒の一端に形成した凹部内にサーミスタ素子を収容し、その電極に接続したリード線を二穴の各穴内に個別に挿込んで互いに隔離し、凹部内に充填したガラスペーストの固形物内にサーミスタ素子を埋め込んだことを最も主要な特徴とする。   In the present invention, a thermistor element is accommodated in a recess formed at one end of a cylindrical two-hole cylindrical insulator, and lead wires connected to the electrodes are individually inserted into the two holes and separated from each other. The most important feature is that the thermistor element is embedded in the solid material of the glass paste filled in the recess.

本発明による温度センサによれば、筒状碍子の凹部内に粉末ガラスのペーストを充填し、その固形物によってサーミスタ素子を封止するため、ガラスの選定には特別に制約を受けず、したがって、温度センサの使用目的に応じ、中温から高温用の結晶質または非晶質の粉末ガラスを任意に選定して一定形状に仕上げることが可能となり、一定形状の温度センサを市場に提供することができる。   According to the temperature sensor of the present invention, the powder glass paste is filled in the concave portion of the cylindrical insulator and the thermistor element is sealed by the solid matter. Depending on the purpose of use of the temperature sensor, it is possible to arbitrarily select crystalline or amorphous powder glass for medium to high temperature and finish it into a fixed shape, and it is possible to provide a temperature sensor with a fixed shape to the market. .

また、サーミスタ素子を埋め込むガラスは二穴の筒状碍子の筒の一端に開口された凹部内に埋め込まれるため、従来の管ガラスによって封止された従来の温度センサに比べて外力に対する破壊強度を大幅に向上できる。   In addition, since the glass that embeds the thermistor element is embedded in a recess opened at one end of a two-hole cylindrical insulator cylinder, it has a higher breaking strength against external force than a conventional temperature sensor sealed with a conventional tube glass. Can greatly improve.

同一形状の温度センサを提供するという目的を筒の一端に凹部を有する二穴の筒状碍子を使用することによって実現した。   The object of providing a temperature sensor of the same shape was realized by using a two-hole cylindrical insulator having a recess at one end of the cylinder.

以下に本発明による温度センサの実施例を図によって説明する。図１、図２において、本発明による温度センサは、サーミスタ素子１と、リード線２，２と、二穴の筒状碍子３と、ガラスペーストの固形物４との組合せからなっている。   Embodiments of a temperature sensor according to the present invention will be described below with reference to the drawings. 1 and 2, the temperature sensor according to the present invention comprises a combination of a thermistor element 1, lead wires 2 and 2, a two-hole cylindrical insulator 3, and a solid material 4 of glass paste.

この実施例において、サーミスタ素子１は、Ｍｎ、Ｃｏ、Ｎｉ、Ｃｕ、Ｚｎ、Ｃｒなどを主成分として複合酸化物のチップであり、両面に電極５，５が形成され、要求特性に合わせて所要寸法に切断されたものである。電極５は、貴金属系ペーストを素子の面に塗布して焼き付けによって形成され、各電極５の面にはそれぞれ導電性ペーストあるいは、溶接によってリード線２が接続されている。   In this embodiment, the thermistor element 1 is a composite oxide chip mainly composed of Mn, Co, Ni, Cu, Zn, Cr, etc., and electrodes 5 and 5 are formed on both sides, and required according to required characteristics. Cut to size. The electrode 5 is formed by applying a noble metal paste to the surface of the element and baking it, and the lead wire 2 is connected to the surface of each electrode 5 by conductive paste or welding.

リード線２は、耐熱性を有する線であり、この実施例においては、鉄・ニッケル系の線を用いた。もちろん鉄・クロム系の線に限らず、ジュメット線や、鉄・クロム系の線を用いることができる。   The lead wire 2 is a wire having heat resistance. In this embodiment, an iron / nickel wire is used. Of course, not only iron / chromium-based wires but also jumet wires or iron / chromium-based wires can be used.

筒状の二穴の筒状碍子３は、温度センサのホルダとなるものであり、フォルステライトあるいはステアタイトなどのムライト系セラミックス製の筒の軸方向に沿って互いに隔離された二つの穴６ａ、６ａが軸方向に平行に開口されたものである。このような二穴の筒状碍子３は、セラミックスメーカーに寸法、形状を指定して制作を依頼することによって得られる。   The cylindrical two-hole cylindrical insulator 3 serves as a temperature sensor holder, and includes two holes 6a separated from each other along the axial direction of a cylinder made of mullite ceramics such as forsterite or steatite. 6a is opened in parallel to the axial direction. Such a two-hole cylindrical insulator 3 can be obtained by requesting production by designating a size and shape from a ceramic manufacturer.

本発明においては、この二穴の筒状碍子３の筒の一端に座ぐり加工を施してサーミスタ素子を収納するための凹部７を一定深さに開口している。
凹部７の深さは、少なくとも凹部７内に収容するサーミスタ素子１のチップ全体が収容される深さに設定される。 In the present invention, a recess 7 for accommodating the thermistor element is opened to a certain depth by countersunk one end of the cylinder of the two-hole cylindrical insulator 3.
The depth of the recess 7 is set to a depth at which the entire chip of the thermistor element 1 accommodated in at least the recess 7 is accommodated.

サーミスタ素子１は、その全体が筒状碍子３の凹部７の深さの範囲内に収容され、サーミスタ素子１の各電極５に接続されたリード線２の各一端は、凹部７の底に連通する二穴の各穴６ａ、６ａ内にそれぞれ個別に挿し込んで両リード線３，３を互いに隔離し、各穴６ａ、６ａを通して筒状碍子３の筒の他端より引き出す。   The thermistor element 1 is entirely accommodated within the depth of the recess 7 of the cylindrical insulator 3, and each end of the lead wire 2 connected to each electrode 5 of the thermistor element 1 communicates with the bottom of the recess 7. The two lead wires 3 and 3 are individually inserted into the two holes 6a and 6a to be separated from each other and pulled out from the other end of the cylindrical insulator 3 through the holes 6a and 6a.

次に、使用目的に応じて任意に選定された中温から高温用の結晶質または非晶質の粉末ガラスをガラスペーストに加工してそのペーストを筒状碍子３の凹部７に充填し、凹部７内からペーストがたれないように凹部７の開口を上向きの姿勢に支えてガラスペーストを乾燥させ、さらに、そのまま筒状碍子３を加熱し、ガラスペーストを溶融させ、その溶融ガラスによって、凹部７内に収容されたサーミスタ素子１の表面の全体を覆う。   Next, a crystalline or amorphous powder glass for medium to high temperature arbitrarily selected according to the purpose of use is processed into a glass paste, and the paste is filled in the recess 7 of the cylindrical insulator 3. The glass paste is dried by supporting the opening of the recess 7 in an upward position so that the paste does not drip from the inside, and the cylindrical insulator 3 is heated as it is to melt the glass paste. Covers the entire surface of the thermistor element 1 housed in the.

溶融ガラスは、凹部７内を満たし、さらにその一部は、凹部６の底に開口された二穴の各穴６ａ、６ａ内に侵入する。その後、筒状碍子３を冷却すると、凹部７内でガラスペーストは固化し、凹部７内のサーミスタ素子１は、リード線２，２の一部を含んでそのガラスペーストの固化物４内に埋め込まれ、リード線２，２は、筒状碍子３の他端から外部に引き出されたガラス封止型サーミスタが得られる。   The molten glass fills the inside of the recess 7, and a part thereof enters the two holes 6 a and 6 a opened at the bottom of the recess 6. Thereafter, when the cylindrical insulator 3 is cooled, the glass paste is solidified in the recess 7, and the thermistor element 1 in the recess 7 is embedded in the solidified product 4 of the glass paste including part of the lead wires 2 and 2. Thus, a glass-sealed thermistor in which the lead wires 2 and 2 are pulled out from the other end of the cylindrical insulator 3 is obtained.

本発明において、サーミスタ素子１が筒状碍子３の凹部７の深さの範囲内に収容されていれば、サーミスタ素子１の全体が少なくとも凹部７の開口面と同一平面を満たして凹部７内に充填されたガラスペーストの固化物４に埋め込まれるが、その固形物４が、凹部７の開口面と同一平面から外部に盛り上げられていても、従来の管ガラスの溶融によってサーミスタ素子を封止する場合のようにサーミスタ素子の封止形状に変形が生じることはない。   In the present invention, if the thermistor element 1 is accommodated within the range of the depth of the recess 7 of the cylindrical insulator 3, the entire thermistor element 1 fills at least the same plane as the opening surface of the recess 7 and enters the recess 7. The thermistor element is sealed by melting the conventional tube glass even if the solid material 4 is embedded in the solidified material 4 of the filled glass paste, even if the solid material 4 is raised from the same plane as the opening surface of the recess 7. As in the case, the sealing shape of the thermistor element is not deformed.

また、本発明において、筒状碍子３を温度センサのホルダとして使用する場合に、図３（ａ）に示すように、筒胴部の基部周面に張り出してフランジ８を予め一体に形成しておけば、このフランジ８を、機器類に取り付ける場合の取付座として利用することができる。フランジ８の張り出し位置は、筒胴部の基部周面に限らず、図３（ｂ）のように筒胴部の先端部周面に張り出してもよい。本発明によれば、サーミスタ素子は、その外周が実質的にセラミック製の筒状碍子に覆われることになるため、耐衝撃性、機械的強度を高めることが可能となる。以上実施例においては、チップ型のサーミスタ素子を使用する場合の例を説明したが、サーミスタ素子はチップ型に限るのもではなく、ビード型のサーミスタ素子であってもよい。   Further, in the present invention, when the cylindrical insulator 3 is used as a temperature sensor holder, as shown in FIG. If this is the case, this flange 8 can be used as a mounting seat for mounting on equipment. The protruding position of the flange 8 is not limited to the peripheral surface of the base portion of the cylindrical body portion, but may be extended to the peripheral surface of the distal end portion of the cylindrical body portion as shown in FIG. According to the present invention, since the outer periphery of the thermistor element is substantially covered with the cylindrical insulator made of ceramic, it is possible to improve the impact resistance and the mechanical strength. In the above embodiment, the example in which the chip type thermistor element is used has been described. However, the thermistor element is not limited to the chip type, and may be a bead type thermistor element.

本発明による温度センサは、自動車用排気ガス温度測定のほか、ガス給湯器、ボイラ、ストーブ等の火炎温度の測定、オープンレンジ内の温度センサなどとして広く活用できる。   The temperature sensor according to the present invention can be widely used as an exhaust gas temperature measurement for automobiles, a flame temperature measurement of a gas water heater, a boiler, a stove, etc., a temperature sensor in an open range, and the like.

本発明による温度センサの斜視図である。It is a perspective view of the temperature sensor by this invention. （ａ）は、本発明による温度センサの縦断面図、（ｂ）は（ａ）のＢ−Ｂ線断面図である。(A) is a longitudinal cross-sectional view of the temperature sensor by this invention, (b) is the BB sectional drawing of (a). （ａ）、（ｂ）は、それぞれ筒状碍子の胴部外周にフランジを一体に形成した例を示す図である。(A), (b) is a figure which shows the example which formed the flange integrally in the trunk | drum outer periphery of a cylindrical insulator, respectively. ガラス封止型サーミスタの従来例を示す図である。It is a figure which shows the prior art example of a glass sealing type thermistor. ガラス封止型サーミスタの他の従来例を示す図である。It is a figure which shows the other conventional example of a glass sealing type thermistor.

符号の説明Explanation of symbols

１ サーミスタ素子
２ リード線
３ 筒状碍子
４ ガラス固形物
５ 電極
６ａ 穴
７ 凹部
８ フランジ 1 Thermistor element 2 Lead wire 3 Cylindrical insulator 4 Solid glass 5 Electrode 6a Hole 7 Recess 8 Flange

Claims (4)

サーミスタ素子と筒状碍子とを有する温度センサ用ガラス封止サーミスタであって、
サーミスタ素子は、チップの両面に電極を有し、各電極にリード線が接続されたものであり、
筒状碍子は、セラミックス製の筒の軸方向に沿って互いに隔離された二つの穴を軸方向に有し、筒の一端に凹部が開口されたものであり、
筒状碍子の一端に開口された凹部内にガラスペーストが充填され、サーミスタ素子は、凹部内に充填したガラスペーストの固形物内に封止されたものであり、
サーミスタ素子の各電極に接続された各リード線は、筒状碍子の二穴の各穴に個別に挿入され、筒状碍子の他端から外部に引き出されているものであることを特徴とする温度センサ用ガラス封止サーミスタ。 A glass-sealed thermistor for a temperature sensor having a thermistor element and a cylindrical insulator,
The thermistor element has electrodes on both sides of the chip, and lead wires are connected to each electrode.
The cylindrical insulator has two holes in the axial direction that are separated from each other along the axial direction of the ceramic cylinder, and a recess is opened at one end of the cylinder.
A glass paste is filled in a recess opened at one end of the cylindrical insulator, and the thermistor element is sealed in a solid material of the glass paste filled in the recess,
Each lead wire connected to each electrode of the thermistor element is individually inserted into each of the two holes of the cylindrical insulator, and is drawn out from the other end of the cylindrical insulator. Glass sealed thermistor for temperature sensor. 凹部内に充填されたガラスペーストの固化物は、凹部内から該凹部に連通する二穴の各穴に侵入し、リード線の一部を含んでサーミスタ素子を封止するものであることを特徴とする請求項１に記載の温度センサ用ガラス封止サーミスタ。   The solidified product of the glass paste filled in the recesses enters the two holes communicating with the recesses from the inside of the recesses, and seals the thermistor element including a part of the lead wires. The glass-sealed thermistor for temperature sensors according to claim 1. サーミスタ素子はその全体が、筒状碍子の凹部の深さの範囲内に収容され、
少なくとも凹部の開口面と同一平面を満たして凹部内に充填されたガラスペーストの固化物に埋め込まれているものであることを特徴とする請求項１に記載の温度センサ用ガラス封止サーミスタ。 The entire thermistor element is accommodated within the depth of the recess of the cylindrical insulator,
The glass-sealed thermistor for a temperature sensor according to claim 1, wherein the glass-sealed thermistor for a temperature sensor is embedded in a solidified material of glass paste filled at least in the same plane as the opening surface of the recess. 筒状碍子は、温度センサのホルダとなるものであり、その胴部周面に張り出してフランジを有し、
フランジは、温度センサを機器類に取り付ける場合の取付座となるものであることを特徴とする請求項１に記載の温度センサ用ガラス封止サーミスタ。 The cylindrical insulator serves as a holder for the temperature sensor, has a flange projecting to the circumferential surface of the trunk,
The glass-sealed thermistor for a temperature sensor according to claim 1, wherein the flange serves as a mounting seat when the temperature sensor is mounted on equipment.
JP2008122148A 2008-05-08 2008-05-08 Glass sealed thermistor for temperature sensor Active JP5238343B2 (en)

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