JPH08261847A - Temperature sensor - Google Patents

Abstract

PURPOSE: To provide a temperature sensor whose durability and reliability are not spoiled and whose responsiveness is enhanced. CONSTITUTION: A temperature sensor 10 is constituted of a cylindrical sensor body 2 as a thermistor element, of one pair of lead wires 3 which are extended from both ends of the sensor body 2, of one pair of terminals 4 which are connected to the lead wires 3, of a resin molded part 11 which covers connection parts of the lead wires 3 to the terminals 4 and of a protection part 14 which is installed integrally so as to be extended from the resin molded part 11, which partly surrounds the circumference of the sensor body 2 and which exposes the sensor body 2 to an external atmosphere. Consequently, the temperature sensor can quickly follow a change in the temperature of the external atmosphere, and its responsiveness can be enhanced remarkably. In addition, when the temperature sensor is to be assembled, it is possible to prevent the sensor body 2 from being damaged. In addition, it is possible to surely prevent the lead wires 3 from being broken and the connection parts of the lead wires 3 to the terminals 4 from being stripped, and it is possible to ensure the durability and the reliability of the temperature sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor using a thermistor element or the like, and more particularly to a temperature sensor which is excellent in reliability and durability and can improve responsiveness.

[0002]

2. Description of the Related Art Conventionally, a temperature sensor for detecting a temperature change using, for example, a thermistor element has been widely used. As shown in FIGS. 6 to 7, the normal temperature sensor 1 is
The lead wire 3 extending from the sensor body 2 is soldered to the terminal 4, and the sensor body 2, the lead wire 3 and the terminal 4 are covered with a resin mold 5 so that only the tip portion 4a of the terminal 4 is exposed to the outside. is there.

Such a temperature sensor 1 includes a sensor body 2
Since the lead wire 3 and the terminal 4 are integrally resin-molded, the sensor body 2 vibrates and the lead wire 3 is broken or the lead wire 3 is broken even when used in an environment where shock and vibration are continuously applied. The soldered portion between the wire 3 and the terminal 4 does not peel off. In addition, since the temperature sensor 1 has the sensor body 2 protected by the resin mold 5, the temperature sensor 1 is not damaged during the assembling work or the like and causes a failure. Therefore, the temperature sensor 1 having the above structure has extremely high durability and reliability.

[0004]

By the way, in recent years, in the sensor used in the electronic control system of the automobile,
Improvement of detection accuracy and responsiveness is required to perform finer control. However, in the temperature sensor 1 of the above-described type, since the sensor body 2 is completely covered with the resin mold 5, it is difficult for the change in the ambient temperature to be transmitted to the sensor body 2, and the response that quickly follows the change in the ambient temperature. There is a problem of lack of sex.

An object of the present invention is to solve the above problems of the prior art, and to provide a temperature sensor capable of improving responsiveness without impairing durability and reliability.

[0006]

The above object of the present invention is to perform resin molding so as to cover a portion connecting a lead wire extending from a sensor body and a terminal, and to allow the sensor body to be directly exposed to an external atmosphere. This can be achieved by a temperature sensor characterized in that a protective portion surrounding the main body is integrally extended from a resin molding portion.

Further, the above object can be achieved by forming a through hole by the protective portion and disposing the sensor body inside the through hole, and the through hole is disposed coaxially with the sensor body. Can be achieved.

[0008]

In the temperature sensor of the above construction according to the present invention, the sensor body is brought into direct contact with the external atmosphere, and the protective portion surrounding the sensor body is integrally extended from the resin molded portion. Therefore, since the sensor body is in direct contact with the external atmosphere, it is possible to quickly follow the temperature change of the external atmosphere. In addition, since the sensor body is protected by the protective portion, it is possible to prevent the sensor body from being damaged during assembly or the like. Therefore, the reliability and durability of the temperature sensor can be secured and the responsiveness can be improved.

Further, the through hole is formed by the protective portion, and the sensor body is disposed inside the through hole.
Moreover, the through hole is arranged coaxially with the sensor body. Therefore, since the entire sensor body comes into contact with the external atmosphere through the through hole, it is possible to further improve the responsiveness to temperature changes, and moreover, the sensor body and the through hole are arranged in the coaxial direction to further secure the damage. Can be prevented.

[0010]

Embodiments of the temperature sensor according to the present invention will be described below in detail with reference to the accompanying drawings. 1 is an overall perspective view showing a first embodiment of a temperature sensor according to the present invention, FIG. 2 is a plan view of the temperature sensor shown in FIG. 1, and FIG. 3 is A shown in FIG.
-A sectional view taken along the arrow line A, Fig. 4 is an overall perspective view showing a second embodiment of the temperature sensor according to the present invention, and Fig. 5 is a sectional view of the temperature sensor shown in Fig. 4. In the following description, the same reference numerals are used for the same parts and the description thereof will be omitted.

Embodiment 1 As shown in FIGS. 1 to 3, a temperature sensor 10 of this embodiment is used.
The sensor main body 2 includes a pair of lead wires 3 extending from both ends of the sensor main body 2, and a pair of terminals 4 connected to the pair of lead wires 3 by soldering. The sensor body 2 is a cylindrical thermistor element whose resistance value changes remarkably with temperature changes, and is electrically connected to a pair of terminals 4 by a pair of lead wires 3 extending from both ends, and is mounted by the terminals 4. It is arranged so as to be sandwiched by the other party. Further, the sensor body 2 is arranged so that the axial direction thereof is orthogonal to the longitudinal direction of the terminals 4, and the ends of the pair of lead wires 3 do not extend long in the axial direction of the sensor body 2 and the ends of the pair of terminals 4 do not extend. Soldered to the end.

In the sensor 10 of this embodiment, the lead wire 3 and the connecting portion between the lead wire 3 and the terminal 4 are integrally molded with resin. In particular, the lead wire 3 is resin-molded up to the vicinity of the base of the sensor body 2. As a result, even if the sensor body 2 vibrates due to shock or vibration applied to the temperature sensor 10, the lead wire 3 is not broken or the soldered portion of the lead wire 3 and the terminal 4 is not peeled off. Is configured.

On the other hand, a pair of prismatic projecting portions 12 extending in the direction opposite to the tip 4a of the terminal 4 are provided at a portion of the resin mold portion 11 which faces the terminal 4, and the tip portions of these projecting portions 12 are arranged between the projecting portions 12. A prismatic connection part 1 that spans between
The protection part 14 which is 3 is integrally extended. Therefore, the sensor main body 2 is arranged in the through hole 15 formed by the protection portion 14, so that the sensor main body 2 can be prevented from coming into contact with surrounding parts or being damaged by a tool or the like hitting. It is configured. In addition, the sensor body 2
Since the whole of the product comes into direct contact with the external atmosphere, it is possible to quickly follow the temperature change of the external atmosphere,
The responsiveness of the sensor 10 can be improved.

Further, most of the lead wires 3 and the connecting portions between the lead wires 3 and the terminals 4 are resin molded portions 11.
Since it is covered with, it is possible to reliably prevent breakage of the lead wire 3 and peeling of the connecting portion between the lead wire 3 and the terminal 4. Therefore, according to the temperature sensor 10 of the present embodiment, it is possible to obtain a temperature sensor having both high responsiveness that quickly follows the temperature change of the external atmosphere and high reliability and durability.

Further, in the temperature sensor 10 of this embodiment, the through hole 15 is opened in the plate thickness direction of the resin mold portion 11 having a thick plate shape, and the sensor main body 2 is provided in the through hole 15. Since it is provided, the structure of the mold used for resin molding can be simplified, and the manufacturing cost can be reduced.

Embodiment 2 As shown in FIGS. 4 to 5, the temperature sensor 20 of this embodiment is used.
Is different from the temperature sensor 10 of the first embodiment described above in the shape of the protective portion 22 for protecting the sensor body 2. That is, the resin mold portion 21 of the temperature sensor 20 of the present embodiment.
By forming the through hole 23 extending in the coaxial direction with the sensor main body 2, the protective portion 22 provided at the opening can have a smaller opening area than the through hole of the first embodiment described above.

Therefore, the temperature sensor 20 of the present embodiment.
Is that the through hole 23 is not blocked or the sensor body 2 is damaged by surrounding parts arranged adjacent to each other in the plate thickness direction of the resin mold portion 21 formed in a thick plate shape. Absent. Therefore, the responsiveness is not deteriorated by closing the opening of the through hole 23 for the sensor body 2 to come into contact with the external atmosphere. In addition, since the opening area of the through hole 23 is smaller, the possibility that the sensor body 2 is damaged when the parts are assembled can be further reduced.

As described above, according to the temperature sensor of the present invention, it is possible to obtain a temperature sensor that has both high responsiveness and reliability that quickly follows the temperature change of the external atmosphere and durability as in the past. .

It is needless to say that the temperature sensor of the present invention is not limited to the above-mentioned embodiment and various modifications can be made based on the gist of the present invention. For example, in the above-described embodiment, the entire outer surface of the sensor body can be brought into direct contact with the external atmosphere. However, by integrally resin-molding both ends of the sensor body together with the lead wire, It is possible to more reliably prevent breakage of the lead wire due to vibration of the sensor body while ensuring responsiveness.

[0020]

As described above, in the temperature sensor of the present invention, the resin body is molded so as to cover the portion connecting the lead wire extending from the sensor body and the terminal, and the sensor body is brought into direct contact with the external atmosphere. A protective portion surrounding the sensor body is integrally extended from the resin molding portion. Therefore, the sensor body comes into direct contact with the external atmosphere, and the temperature change of the external atmosphere can be quickly followed, and the responsiveness can be significantly improved while ensuring the durability and reliability of the temperature sensor.

Further, since the sensor main body is protected by the protective portion, it is possible to prevent the sensor main body from being damaged at the time of assembling to cause a failure, and the connecting portion between the lead wire and the terminal is made of resin. Since it is covered with the mold, it is possible to reliably prevent breakage of the lead wire and peeling of the connecting portion between the lead wire and the terminal. Therefore, the responsiveness can be significantly improved without impairing the durability or reliability of the temperature sensor.

[Brief description of drawings]

FIG. 1 is an overall perspective view showing a first embodiment of a temperature sensor according to the present invention.

FIG. 2 is a plan view of the temperature sensor shown in FIG.

3 is a cross-sectional view taken along the line AA shown in FIG.

FIG. 4 is an overall perspective view showing a second embodiment of the temperature sensor according to the present invention.

5 is a cross-sectional view of the temperature sensor shown in FIG.

FIG. 6 is an overall perspective view of a conventional temperature sensor.

7 is a cross-sectional view of the temperature sensor shown in FIG.

[Explanation of Codes] 2 Sensor body 3 Lead wire 4 Terminal 5 Resin mold part 6 Protective part 7 Through hole 10 Temperature sensor (Example 1) 11 Resin mold part 12 Projection part 13 Connection part 14 Protective part 15 Through hole 20 Temperature sensor (Example 2) 21 resin mold part 22 protective part 23 through hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shinichiro Aranami 1-7-1 Yokoi Shimada City, Shizuoka Yazaki Keiki Co., Ltd.

Claims (3)

[Claims] 1. A resin mold is formed so as to cover a portion connecting a lead wire extending from a sensor body and a terminal, and the sensor body is brought into direct contact with an external atmosphere, and a protective portion surrounding the sensor body is made of resin. A temperature sensor, which is integrally extended from a molded portion. 2. The temperature sensor according to claim 1, wherein a through hole is formed by the protective portion, and the sensor body is provided inside the through hole. 3. The temperature sensor according to claim 2, wherein the through hole is arranged coaxially with the sensor body.