JP6895186B1 - Temperature sensor - Google Patents

Temperature sensor Download PDF

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JP6895186B1
JP6895186B1 JP2019232960A JP2019232960A JP6895186B1 JP 6895186 B1 JP6895186 B1 JP 6895186B1 JP 2019232960 A JP2019232960 A JP 2019232960A JP 2019232960 A JP2019232960 A JP 2019232960A JP 6895186 B1 JP6895186 B1 JP 6895186B1
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rear end
lead wires
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JP2021101173A (en
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拓洋 岡田
拓洋 岡田
健司 飛嶋
健司 飛嶋
雄二 高野
雄二 高野
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Ohizumi Mfg Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K7/00—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements
    • G01K7/16—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements
    • G01K7/22—Measuring temperature based on the use of electric or magnetic elements directly sensitive to heat ; Power supply therefor, e.g. using thermoelectric elements using resistive elements the element being a non-linear resistance, e.g. thermistor

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Abstract

【課題】サーミスタと、先端がサーミスタに接続された一対の引き出し線と、サーミスタと一対の引き出し線の先端部をシールするガラスとを含む温度センサにおいて、一対の引き出し線が折り曲げられてしまうことを充分確実に防止する。【解決手段】一対の引き出し線の各々の先端部以外の部分、即ちガラスによってシールされていない部分に、熱硬化性合成樹脂製チューブを被嵌する。【選択図】図２PROBLEM TO BE SOLVED: To bend a pair of leader wires in a temperature sensor including a thermistor, a pair of leader wires whose tips are connected to the thermistor, and a glass for sealing the tip portions of the thermistor and the pair of leader wires. Prevent it sufficiently and surely. SOLUTION: A thermosetting synthetic resin tube is fitted on a portion other than the tip portion of each of a pair of leader wires, that is, a portion not sealed by glass. [Selection diagram] Fig. 2

Description

本発明は、温度センサ、更に詳しくはGRC（Glass sealed radial lead chip thermistor）型温度センサ（即ちサーミスタと先端がサーミスタに接続された一対の引き出し線の先端部がガラスによってシールされている形態の温度センサ）に関する。 The present invention is a temperature sensor, more specifically a GRC (Glass sealed radial lead chip thermistor) type temperature sensor (that is, a temperature in which the thermistor and the tip of a pair of leader wires connected to the thermistor are sealed with glass. Regarding the sensor).

下記特許文献１には、GRC型温度センサとして、サーミスタと、先端がサーミスタに接続された一対の引き出し線と、サーミスタと一対の引き出し線の先端部をシールするガラスと、先端が一対の引き出し線の各々の後端に接続された一対のリード線と、ガラス、一対の引き出し線の先端部以外の部分及び一対のリード線の先端部を被覆する合成樹脂製被覆層とを含む温度センサが開示されている。被覆は加熱溶融された内層と加熱収縮された外層とを有する。 In Patent Document 1 below, as a GRC type temperature sensor, a thermistor, a pair of leader wires whose tips are connected to the thermistor, a glass that seals the tips of the thermistor and the pair of leader wires, and a pair of leader wires whose tips are paired. A temperature sensor comprising a pair of lead wires connected to the rear ends of each of the above, a glass, a portion other than the tip of the pair of lead wires, and a synthetic resin coating layer covering the tip of the pair of lead wires. Has been done. The coating has a heat-melted inner layer and a heat-shrinked outer layer.

特許第５８３０６３６号公報Japanese Patent No. 5830636

而して、上述した形態の温度センサには、特に温度センサの温度検出部（即ちガラスでシールされているサーミスタ及び一対の引き出し線の先端部）を狭小部に挿入して所要位置に固定する際に、一対の引き出し線におけるガラスによってシールされていない部分が折り曲げられ、これに起因して引き出し線が切断されてしまう、ガラスが破断されサーミスタが露呈されてしまう、或いは一対の引き出し線が短絡してしまう、という問題が発生する虞がある。 Thus, in the temperature sensor of the above-described form, in particular, the temperature detection part of the temperature sensor (that is, the thermistor sealed with glass and the tip of the pair of leader wires) is inserted into a narrow part and fixed at a required position. At that time, the part of the pair of leader wires that is not sealed by the glass is bent, which causes the leader wire to be cut, the glass to be broken and the thermistor to be exposed, or the pair of leader wires to be short-circuited. There is a possibility that the problem of doing so may occur.

本発明は上記事実に鑑みてなされたものであり、その主たる技術的課題は、一対の引き出し線が折り曲げられてしまうことが充分確実に防止され、そして更に取扱い特性が良好で且つ測温特性も良好である、新規且つ改良された温度センサを提供することである。 The present invention has been made in view of the above facts, and its main technical problem is that the pair of leader wires are sufficiently prevented from being bent, and the handling characteristics are good and the temperature measurement characteristics are also good. It is to provide a good, new and improved temperature sensor.

本発明によれば、上記技術的課題を達成する温度センサとして、
サーミスタと、先端が該サーミスタに接続された一対の引き出し線と、該サーミスタと該一対の引き出し線の先端部をシールするガラスと、先端が該一対の引き出し線の各々の後端に接続された一対のリード線と、該ガラス、該一対の引き出し線の該先端部以外の部分及び該一対のリード線の先端部を被覆する合成樹脂製被覆層とを含む温度センサにおいて、
該一対の引き出し線の各々の該先端部以外の部分には、熱硬化性合成樹脂製チューブが被嵌されており、
該一対の引き出し線の一方の該後端と該一対のリード線の一方の該先端との接続部は、該一対の引き出し線の他方の該後端と該一対のリード線の他方の該先端との接続部よりも長手方向前方に位置し、該被覆層は小外径前部、該前部に続く後方に向かって外径が漸次増大する第一の増径部、該第一の増径部に続く中外径中間部、該中間部に続く後方に向かって外径が漸次増大する第二の増径部、及び該第二の増径部に続く大外径後部を有し、該一対の引き出し線の該一方の該後端と該一対のリード線の該一方の該先端との該接続部は、該第一の増径部の後端部と該中間部の前端部とに跨って位置し、該一対の引き出し線の該他方の該後端と該一対のリード線の該他方の該先端との該接続部は、該第二の増径部の後端部と該後部の前端部とに跨って位置し、
該被覆層は加熱溶融された内層と加熱収縮された外層とを有し、該ガラスの周表面は該外層の内面に直接的に接触せしめられている、
ことを特徴とする温度センサが提供される。 According to the present invention, as a temperature sensor that achieves the above technical problems,
The thermistor, a pair of leaders whose tips are connected to the thermistor, a glass that seals the thermistor and the tips of the pair of leaders, and tips connected to the rear ends of each of the pair of leaders. In a temperature sensor including a pair of lead wires, the glass, a portion of the pair of leader wires other than the tip portion, and a synthetic resin coating layer covering the tip portions of the pair of lead wires.
A thermosetting synthetic resin tube is fitted to each portion of the pair of leader wires other than the tip portion.
The connection between the rear end of one of the pair of leaders and the tip of one of the pair of lead wires is the other rear end of the pair of leaders and the other tip of the pair of lead wires. The coating layer is located anterior in the longitudinal direction with respect to the connection portion with, and the coating layer has a small outer diameter front portion, a first diameter increasing portion in which the outer diameter gradually increases toward the rear following the front portion, and the first increasing portion. It has a middle outer diameter middle part that follows the diameter part, a second diameter increase part that gradually increases the outer diameter toward the rear following the middle part, and a large outer diameter rear part that follows the second diameter increase part. The connection between the rear end of the one of the pair of lead wires and the tip of the one of the pair of lead wires is formed at the rear end of the first diameter-increasing portion and the front end of the intermediate portion. The connection between the other rear end of the pair of lead wires and the other end of the pair of lead wires is located straddling the rear end of the second diameter-increasing portion and the rear end. Located across the front end of the
The coating layer has a heat-melted inner layer and a heat-shrinked outer layer, and the peripheral surface of the glass is in direct contact with the inner surface of the outer layer.
A temperature sensor is provided.

該外層の加熱収縮により該内層は該被覆層の後端及び前端から外部に流出するが、該前端においては該内層の流出部が取り除かれているが、該後端においては該内層の流出部が残留されているのが好ましい。 The inner layer by heat shrinking of the outer layer flows out from the rear end and the front end of the coating layer but, although the outflow portion of the inner layer is removed in the front end, the outflow portion of the inner layer in the rear end Is preferably retained.

本発明の温度サンサにおいては、一対の引き出し線の所要部位に被嵌されたチューブによって一対の引き出し線の各々の先端部以外の部分、即ちガラスによってシールされていない部分の剛性が増大され、折り曲げられてしまうことが充分確実に防止される。被覆層が加熱溶融された内層と加熱収縮された外層とを有する形態、従って被覆層が加熱される場合においても、チューブは熱硬化性合成樹脂製であるので被覆層の加熱によってチューブが劣化されることはない。
加えて、被覆層は小外径前部、前部に続く後方に向かって外径が漸次増大する第一の増径部、第一の増径部に続く中外径中間部、中間部に続く後方に向かって外径が漸次増大する第二の増径部、及び第二の増径部に続く大外径後部を有する形態である故に、取扱い特性が良好である。また、ガラスの周表面は外層の内面に直接的に接触せしめられている故に、測温特性も良好である。 In the temperature sancer of the present invention, the tube fitted to the required portion of the pair of leader wires increases the rigidity of the portion other than the tip of each of the pair of leader wires, that is, the portion not sealed by the glass, and bends. It is sufficiently surely prevented from being damaged. Even when the coating layer has a heat-melted inner layer and a heat-shrinked outer layer, and therefore the coating layer is heated, the tube is made of a thermosetting synthetic resin, so that the tube is deteriorated by heating the coating layer. There is nothing.
In addition, the coating layer continues to the small outer diameter front part, the first diameter increasing part where the outer diameter gradually increases toward the rear following the front part, the middle outer diameter middle part following the first diameter increasing part, and the middle part. Since it has a second diameter-increasing portion in which the outer diameter gradually increases toward the rear and a large outer-diameter rear portion following the second diameter-increasing portion, the handling characteristics are good. Further, since the peripheral surface of the glass is in direct contact with the inner surface of the outer layer, the temperature measurement characteristics are also good.

本発明に従って構成された温度センサの好適実施形態を示す断面図。FIG. 5 is a cross-sectional view showing a preferred embodiment of a temperature sensor configured according to the present invention. 図１の温度センサにおける主要部を示す部分側面図。The partial side view which shows the main part in the temperature sensor of FIG.

以下、本発明に従って構成された温度センサの好適実施形態を図示している添付図面を参照して、更に詳細に説明する。 Hereinafter, description will be made in more detail with reference to the accompanying drawings illustrating preferred embodiments of the temperature sensor configured according to the present invention.

図１及び図２を参照して説明すると、全体を番号２で示す、本発明に従って構成された温度センサは、サーミスタ４、先端がサーミスタ４に接続された一対の引き出し線６ａ及び６ｂを含んでいる。一対の引き出し線６ａ及び６ｂはジュメット線から形成されているのが好適である。サーミスタ４並びに一対の引き出し線６ａ及び６ｂの先端部はガラス８によってシールされている。ガラス８の外周面は円筒形状であるのが好都合である。一対の引き出し線６ａ及び６ｂの各々の後端には一対のリード線１０ａ及び１０ｂの先端が接続されている。一対のリード線１０ａ及び１０ｂの各々は、多数の撚り線から構成された芯材１２ａ及び１２ｂをＰＴＦＥ（ポリテトラフルオロエチレン）の如きフッ素系合成樹脂製であるのが好都合である外装チューブ１４ａ及び１４ｂによって被覆した形態であるのが好ましい。一対のリード線１０ａ及び１０ｂの各々の先端においては外装チューブ１４ａ及び１４ｂが除去されて芯材１２ａ及び１２ｂが露呈されており、一対の引き出し線６ａ及び６ｂの後端は露呈された芯材１２ａ及び１２ｂに溶接又は半田付けによって接続されている。 With reference to FIGS. 1 and 2, is generally designated at 2, a temperature sensor constructed in accordance with the present invention, the thermistor 4, includes a pair of lead wire 6a and 6b the tip is connected to the thermistor 4 There is. The pair of leader wires 6a and 6b are preferably formed from jumet wires. The thermistor 4 and the tips of the pair of lead wires 6a and 6b are sealed with glass 8. It is convenient that the outer peripheral surface of the glass 8 has a cylindrical shape. The tips of the pair of lead wires 10a and 10b are connected to the rear ends of the pair of lead wires 6a and 6b, respectively. For each of the pair of lead wires 10a and 10b, it is convenient that the core materials 12a and 12b composed of a large number of stranded wires are made of a fluorine-based synthetic resin such as PTFE (polytetrafluoroethylene). The form coated with 14b is preferable. At the tips of the pair of lead wires 10a and 10b, the outer tubes 14a and 14b are removed to expose the core materials 12a and 12b, and the rear ends of the pair of lead wires 6a and 6b are exposed. And 12b are connected by welding or soldering.

図１を参照することによって明確に理解されるとおり、一対の引き出し線６ａ及び６ｂの一方６ａの後端と一対のリード線１０ａ及び１０ｂの一方１０ａの先端との接続部１６ａと、一対の引き出し線６ａ及び６ｂの他方６ｂの後端と一対のリード線１０ａ及び１０ｂの他方１０ｂの先端との接続部１６ｂとは、長手方向において相互にずらされていて、一対の引き出し線６ａ及び６ｂの一方６ａの後端と一対のリード線１０ａ及び１０ｂの一方１０ａの先端との接続部１６ａは、一対の引き出し線６ａ及び６ｂの他方６ｂの後端と一対のリード線１０ａ及び１０ｂの他方１０ｂの先端との接続部１６ｂよりも幾分前方に位置せしめられているのが好ましい。 As is clearly understood by referring to FIG. 1, a connection portion 16a between the rear end of one of the pair of lead wires 6a and 6b 6a and the tip of one of the pair of lead wires 10a and 10b 10a, and a pair of leaders. The connecting portion 16b between the rear end of the other 6b of the wires 6a and 6b and the tip of the other 10b of the pair of lead wires 10a and 10b is displaced from each other in the longitudinal direction, and is one of the pair of lead wires 6a and 6b. The connection portion 16a between the rear end of 6a and the tip of one of the pair of lead wires 10a and 10b 10a is the tip of the other 10b of the pair of lead wires 10a and 10b with the rear end of the other 6b of the pair of lead wires 6a and 6b. It is preferably positioned slightly in front of the connection portion 16b with and from.

引き出し線６ａ及び６ｂの各々におけるガラス８によってシールされていない部分には、熱硬化性合成樹脂、好ましくはポリイミド，ポリアミド又はポリイミドアミド、から形成されているチューブ１８ａ及び１８ｂが被嵌されていることが重要である。引き出し線６ａ及び６ｂにおけるガラス８によってシールされていない部分の実質上全長に渡ってチューブ１８ａ及び１８ｂが被嵌されているのが好都合である。チューブ１８ａ及び１８ｂの内径は引き出し線６ａ及び６ｂの外径よりも幾分大きく、従って引き出し線６ａ及び６ｂに充分容易にチューブ１８ａ及び１８ｂを被嵌することができるのが好都合である。 The portions of the lead wires 6a and 6b that are not sealed by the glass 8 are fitted with tubes 18a and 18b made of a thermosetting synthetic resin, preferably polyimide, polyamide or polyimideamide. is important. It is convenient that the tubes 18a and 18b are fitted over substantially the entire length of the portion of the lead wires 6a and 6b that is not sealed by the glass 8. The inner diameters of the tubes 18a and 18b are somewhat larger than the outer diameters of the lead wires 6a and 6b, so it is convenient that the tubes 18a and 18b can be fitted to the lead wires 6a and 6b sufficiently easily.

図１に明確に図示するとおり、図示の温度センサ２は、ガラス８、一対の引き出し線６ａ及び６ｂのガラス８によってシールされている先端部以外の部分、並びに一対のリード線１０ａ及び１０ｂの先端部を被覆するチューブ形状の被覆層２０を含んでいる。かかる被覆層２０は、加熱溶融される内層２２と加熱収縮される外層２４とから構成されているのが望ましい。内層２２の好適例としては融点が３０２乃至３１０℃程度であるＰＦＡ（テトラフルオロエチレン・パールオロアルキルビニルエーテル供重合体）を上げることができ、外層２４の好適例としては融点が３２７℃程度であるＰＴＦＥ（ポリテトラフルオロエチレン）を挙げることができる。かような被覆層２０は、チューブ形状の内層２２と外層２４を予め積層した状態で、幾分弾性的に拡張して所要部位に強制的に被嵌し、しかる後に例えば３１５℃程度に加熱することによって好都合に配設することができる。３１５℃程度に加熱すると、内層２２は溶融され、外層２４は収縮され、かくしてガラス８、一対の引き出し線６ａ及び６ｂのガラス８によってシールされている先端部以外の部分、並びに一対のリード線１０ａ及び１ｂの先端部が被覆層２０によって堅固に被覆される。加熱溶融された内層２２は冷却されて硬化されるが、冷却される前に外層２４の収縮に起因して被覆層２０の後端及び前端から外部に流出する傾向がある。図１には被覆層２０の後端から流出した内層を番号２２Ａで示している。被覆層２０の後端から流出した内層２２Ａは特に取り除く必要はないが、被覆層２０の前端から流出した内層（図示していない）は、所要部位に温度センサ２の温度検出部を装着する際に妨げとなるので、取り除くことが必要である。 As clearly illustrated in FIG. 1, the illustrated temperature sensor 2 includes a portion of glass 8, a pair of lead wires 6a and 6b other than the tip sealed by the glass 8, and a pair of lead wires 10a and 10b. It contains a tube-shaped coating layer 20 that covers the portion. It is desirable that the coating layer 20 is composed of an inner layer 22 that is heat-melted and an outer layer 24 that is heat-shrinked. As a preferable example of the inner layer 22, PFA (tetrafluoroethylene / perfluoroalkyl vinyl ether copolymer) having a melting point of about 302 to 310 ° C. can be raised, and as a preferable example of the outer layer 24, the melting point is about 327 ° C. PTFE (polytetrafluoroethylene) can be mentioned. In such a coating layer 20, in a state where the tube-shaped inner layer 22 and the outer layer 24 are laminated in advance, they are elastically expanded to some extent and forcibly fitted to a required portion, and then heated to, for example, about 315 ° C. This can be conveniently arranged. When heated to about 315 ° C., the inner layer 22 is melted and the outer layer 24 is contracted, thus that the glass 8, the pair of lead wires 6a and 6b other than the tip portion sealed by the glass 8, and the pair of lead wires 10a. And the tip of 1b is firmly covered by the coating layer 20. The heat-melted inner layer 22 is cooled and hardened, but tends to flow out from the rear end and the front end of the coating layer 20 due to the shrinkage of the outer layer 24 before being cooled. In FIG. 1, the inner layer flowing out from the rear end of the coating layer 20 is indicated by No. 22A. The inner layer 22A that has flowed out from the rear end of the coating layer 20 does not need to be removed in particular, but the inner layer (not shown) that has flowed out from the front end of the coating layer 20 is used when the temperature detection unit of the temperature sensor 2 is attached to a required portion. It is necessary to remove it because it interferes with the temperature.

内層２２と外層２４とから構成されている被覆層２０は所要部位に被覆する前、従って加熱する前の状態で、外層２４の内径がガラス８の外径と実質上同一或いは若干だけ大きいことが重要である。かような被覆層２０を使用すると、弾性的に幾分拡張して所要部位に被覆した後に加熱して内層２２を溶融し外層２４を収縮させると、図１に明確に図示する如く、ガラス８が位置する部位においては内層２２が実質上存在せず、外層２４が直接的にガラス８に接触する。従って、温度を検出すべき部位に温度センサ２の温度検出部を装着すると外層２４のみを介してガラス８が温度を検出すべき部位に当接され、良好な測温特性が達成される。 The coating layer 20 is composed of an inner layer 22 and outer layer 24. Prior to coating the required site and thus in a state before heating, it inside diameter of the outer layer 24 is larger by outer diameter substantially the same or slightly glass 8 It's important . When such a coating layer 20 is used, the glass 8 is elastically expanded to cover the required portion and then heated to melt the inner layer 22 and shrink the outer layer 24, as clearly illustrated in FIG. The inner layer 22 is substantially absent at the site where the is located, and the outer layer 24 comes into direct contact with the glass 8. Therefore, when the temperature detection unit of the temperature sensor 2 is attached to the portion where the temperature should be detected, the glass 8 is brought into contact with the portion where the temperature should be detected only through the outer layer 24, and good temperature measurement characteristics are achieved.

上述した通りにして被覆層２０を配設すると、図１に図示するとおり、被覆層２０は小外径前部２６、これに続く後方に向かって外径が漸次増大する第一の増径部２８、第一の増径部２８に続く中外径中間部３０、中間部３０に続く外径が漸次増大する第二の増径部３２、及び第二の増径部３２に続く大外径後部３４を有する形態になる。かかる形態は外観上優れていることに加えて取扱い特性も良好である。引き出し線６ａの後端とリード線１０ａの先端との接合部１６ａは第一の増径部２８の後端部と中間部の前端部とに跨って位置し、引き出し線６ｂの後端とリード線１０ｂの前端との接合部１６ｂは第二の増径部３２と後端部の前端部とに跨って位置する。 When the coating layer 20 is arranged as described above, as shown in FIG. 1, the coating layer 20 has a small outer diameter front portion 26, followed by a first diameter increasing portion whose outer diameter gradually increases toward the rear. 28, the middle outer diameter middle portion 30 following the first diameter increase portion 28, the second diameter increase portion 32 following the middle portion 30, and the large outer diameter rear portion following the second diameter increase portion 32. It becomes a form having 34. In addition to being excellent in appearance, such a form also has good handling characteristics. The joint portion 16a between the rear end of the lead wire 6a and the tip of the lead wire 10a is located so as to straddle the rear end portion of the first diameter-increasing portion 28 and the front end portion of the intermediate portion, and the rear end of the lead wire 6b and the lead. The joint portion 16b with the front end of the wire 10b is located so as to straddle the second diameter-increasing portion 32 and the front end portion of the rear end portion.

２：温度センサ
４：サーミスタ
６ａ：引き出し線
６ｂ：引き出し線
８：ガラス
１０ａ：リード線
１０ｂ：リード線
１６ａ：接続部
１６ｂ：接続部
１８ａ：チューブ
１８ｂ：チューブ
２０：被覆層
２２：内層
２４：外層 2: Temperature sensor 4: Thermistor 6a: Leader wire 6b: Leader wire 8: Glass 10a: Lead wire 10b: Lead wire 16a: Connection part 16b: Connection part 18a: Tube 18b: Tube 20: Coating layer 22: Inner layer 24: Outer layer

Claims (2)

サーミスタと、先端が該サーミスタに接続された一対の引き出し線と、該サーミスタと該一対の引き出し線の先端部をシールするガラスと、先端が該一対の引き出し線の各々の後端に接続された一対のリード線と、該ガラス、該一対の引き出し線の該先端部以外の部分及び該一対のリード線の先端部を被覆する合成樹脂製被覆層とを含む温度センサにおいて、
該一対の引き出し線の各々の該先端部以外の部分には、熱硬化性合成樹脂製チューブが被嵌されており、
該一対の引き出し線の一方の該後端と該一対のリード線の一方の該先端との接続部は、該一対の引き出し線の他方の該後端と該一対のリード線の他方の該先端との接続部よりも長手方向前方に位置し、該被覆層は小外径前部、該前部に続く後方に向かって外径が漸次増大する第一の増径部、該第一の増径部に続く中外径中間部、該中間部に続く後方に向かって外径が漸次増大する第二の増径部、及び該第二の増径部に続く大外径後部を有し、該一対の引き出し線の該一方の該後端と該一対のリード線の該一方の該先端との該接続部は、該第一の増径部の後端部と該中間部の前端部とに跨って位置し、該一対の引き出し線の該他方の該後端と該一対のリード線の該他方の該先端との該接続部は、該第二の増径部の後端部と該後部の前端部とに跨って位置し、
該被覆層は加熱溶融された内層と加熱収縮された外層とを有し、該ガラスの周表面は該外層の内面に直接的に接触せしめられている、
ことを特徴とする温度センサ。 The thermistor, a pair of leaders whose tips are connected to the thermistor, a glass that seals the thermistor and the tips of the pair of leaders, and tips connected to the rear ends of each of the pair of leaders. In a temperature sensor including a pair of lead wires, the glass, a portion of the pair of leader wires other than the tip portion, and a synthetic resin coating layer covering the tip portions of the pair of lead wires.
A thermosetting synthetic resin tube is fitted to each portion of the pair of leader wires other than the tip portion.
The connection between the rear end of one of the pair of leaders and the tip of one of the pair of lead wires is the other rear end of the pair of leaders and the other tip of the pair of lead wires. The coating layer is located anterior in the longitudinal direction with respect to the connection portion with, and the coating layer has a small outer diameter front portion, a first diameter increasing portion in which the outer diameter gradually increases toward the rear following the front portion, and the first increasing portion. It has a middle outer diameter middle part that follows the diameter part, a second diameter increase part that gradually increases the outer diameter toward the rear following the middle part, and a large outer diameter rear part that follows the second diameter increase part. The connection between the rear end of the one of the pair of leader wires and the tip of the one of the pair of lead wires is formed at the rear end of the first diameter-increasing portion and the front end of the intermediate portion. The connection between the other rear end of the pair of lead wires and the other end of the pair of lead wires is located straddling the rear end of the second diameter-increasing portion and the rear end. Located across the front end of the
The coating layer has a heat-melted inner layer and a heat-shrinked outer layer, and the peripheral surface of the glass is in direct contact with the inner surface of the outer layer.
A temperature sensor characterized by that. 該被覆層は加熱溶融された内層と加熱収縮された外層とを有し、該外層の加熱収縮により該内層は該被覆層の後端及び前端から外部に流出するが、該前端においては該内層の流出部が取り除かれているが該後端においては該内層の流出部が残留されている、請求項１記載の温度センサ。 The coating layer has an inner layer that has been heat-melted and an outer layer that has been heat-shrinked, and the inner layer flows out from the rear end and the front end of the coating layer due to the heat shrinkage of the outer layer. temperature sensors but the outflow portion is removed in the rear end outlet portion of the inner layer is remaining, claim 1 Symbol placement of.
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