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Temperature sensor and manufacturing method thereof

A technology of temperature sensor and reference direction, applied in thermometers, instruments, thermometers with electric/magnetic elements directly sensitive to heat, etc., can solve the problems of reduced yield and disconnection, achieve high yield and suppress disconnection Effect

Active Publication Date: 2019-08-20
DENSO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the setting of the coefficient of linear expansion is not appropriate, there is a possibility that the metal lead wire stretched in the direction of extension due to the primary injection resin that is greatly thermally expanded may be disconnected due to the generation of stress, thereby reducing the yield.

Method used

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  • Temperature sensor and manufacturing method thereof
  • Temperature sensor and manufacturing method thereof
  • Temperature sensor and manufacturing method thereof

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Embodiment Construction

[0028] Hereinafter, an embodiment of the present disclosure will be described based on the drawings.

[0029] As an embodiment of the present disclosure, figure 1 , 2 The shown temperature sensor 1 is installed inside the engine room of the vehicle on the inside of the front grill. The temperature sensor 1 senses the temperature of the air outside the vehicle. Such as image 3 As shown, the use temperature range ΔT is defined for such a temperature sensor 1 as the difference between the lowest temperature reached by the air outside the vehicle in a cold environment and the highest temperature reached by the vehicle at rest or at low speed due to radiant heat from the engine . here, in image 3 In the numerical example of , a wide operating temperature range ΔT of 110°C is assumed in advance as the difference between the lowest temperature of -30°C and the highest temperature of 80°C.

[0030] First, the configuration of the temperature sensor 1 will be described in detai...

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PUM

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Abstract

A temperature sensor (1) is provided with: a temperature-sensitive element (10) for sensing a temperature; metal lead wires (20, 20a, 20b) formed from a metal material and having an extension part (21) extending along a reference direction (Db), the metal lead wires (20, 20a, 20b) being electrically connected to the temperature-sensitive element; a resin casing (40) formed from a resin material, the metal lead wires being inserted into the resin casing (40) by molding in a mold; and a middle cover (50) formed from a specific material having a coefficient of linear expansion in the reference direction greater than that of the metal lead wires and less than that of the resin casing, the middle cover (50) being interposed between the resin casing and the metal lead wires. The difference in coefficient of linear expansion between the metal lead wires and the middle cover in the reference direction is set in a specific range whereby stress that occurs in the metal lead wires in response to the difference in coefficient of linear expansion is limited so as to be less than the tensile strength of the metal lead wires.

Description

[0001] This application claims the priority of Japanese Patent Application No. 2015-6180 filed on January 15, 2015, the entire contents of which are incorporated herein. technical field [0002] The present disclosure relates to temperature sensors and methods of manufacturing the same. Background technique [0003] Conventionally, there is known a temperature sensor in which a metal lead electrically connected to a temperature-sensing element for sensing temperature is embedded in a resin case by insert molding. [0004] For example, Patent Document 1 discloses a technique in which a primary injection resin is sandwiched between a resin case which is a secondary injection resin and a metal lead in a sensor device utilized as a temperature sensor or the like. In such a technique, the relationship between the magnitude of the coefficient of linear expansion is different between the flow direction of the molten resin material during injection molding and the direction perpendi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K7/22
Inventor 福岛秀和
Owner DENSO CORP