Temperature sensor and method for manufacturing the same

Abstract

To provide a temperature sensor that can be inserted into a narrow space having small dimensions in directions perpendicular to each other and has flexibility that allows it to be bent.SOLUTION: A temperature sensor 1 of the present invention comprises: a sensor element 10 having a heat sensor 11 arranged forward in a first direction and a pair of first electric wires 12 drawn out rearward in the first direction and electrically connected to the heat sensor 11; a pair of second electric wires 20 electrically connected to each of the pair of first electric wires 12 at connection portions 15; a first coating 30A made of a resin material that covers the heat sensor 11 and a portion of the pair of first electric wires 12; and a second coating 30B made of a resin material that covers the connection portions 15.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a temperature sensor and a method for manufacturing a temperature sensor. [Background technology]

[0002] Temperature sensors are used in a variety of applications, and among these applications there is a demand for thin temperature sensors that are small in thickness, for example, so that they can be inserted into narrow spaces.

[0003] Patent Document 1 discloses a thin temperature sensor that can be made thinner and has a larger contact area with the object to be measured, thereby improving temperature detection accuracy. The temperature sensor in Patent Document 1 includes an inner layer formed by hardening or solidifying a pair of sheet-shaped resin inner layer materials, and an outer layer formed by a pair of sheet-shaped resin outer layer materials with flat surfaces on both sides. The thicknesses of the inner and outer layers in the temperature sensor in Patent Document 1 are, for example, 1 mm to 1.25 mm for the inner layer and 0.25 mm x 2 (sheets) = 0.5 mm for the outer layer. Patent Document 1 also provides a thin, flexible, and bendable temperature sensor with a thickness of approximately 1.5 mm. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6606308 Summary of the Invention [Problem to be solved by the invention]

[0005] Although the temperature sensor in Patent Document 1 is thin, its purpose is to increase the contact area with the object to be measured, so its width dimension, which is perpendicular to the thickness direction, is larger than its thickness dimension, making it difficult to deform. Therefore, the temperature sensor in Patent Document 1 cannot be inserted into a narrow space where the dimensions in the directions perpendicular to each other are small to detect the temperature.

[0006] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a temperature sensor that can be inserted into a narrow space having small dimensions in directions perpendicular to each other and that has flexibility that allows it to be bent. [Means for solving the problem]

[0007] The temperature sensor of the present invention comprises: a sensor element including a heat-sensitive body and a pair of first electric wires electrically connected to the heat-sensitive body on one side in the first direction and drawn out toward the other side in the first direction; a pair of second electric wires electrically connected to the pair of first electric wires at connection portions; a first covering made of a resin material that covers the heat sensitive element and the pair of first electric wires; and a second covering made of a resin material that covers the connection portion.

[0008] In the temperature sensor of the present invention, preferably, The pair of second electric wires includes a pair of core wires and a covering layer covering each of the pair of core wires, The second covering body is In addition to the connection portion, it covers from the other side of the first covering to one side of the covering layer of the second wire.

[0009] In the temperature sensor of the present invention, preferably, If a direction perpendicular to the first direction in which the pair of first electric wires are arranged is defined as a second direction, the dimension of the second covering in the second direction is larger than the dimension of the first covering in the second direction.

[0010] In the temperature sensor of the present invention, preferably, The dimension of the second coating in a third direction perpendicular to the first and second directions is greater than the dimension of the first coating in the third direction.

[0011] In the temperature sensor of the present invention, preferably, The dimension of the first coating in the first direction is larger than the dimension of the second coating in the first direction.

[0012] In the temperature sensor of the present invention, preferably, The pair of first electric wires are connected to the outer sides of the pair of second electric wires in the second direction.

[0013] In the temperature sensor of the present invention, preferably, The distance between each of the pair of first electric wires increases toward the other side in the first direction.

[0014] In the temperature sensor of the present invention, preferably, the first covering body is composed of a first inner layer and a first outer layer covering the first inner layer, The second covering is composed of a second inner layer and a second outer layer that covers the second inner layer.

[0015] In the temperature sensor of the present invention, preferably, The first inner layer and the second inner layer are made of PFA, The first outer layer and the second outer layer are made of PTFE.

[0016] In the temperature sensor of the present invention, preferably, The sensor element is The device further includes a seal made of an insulating material that seals the heat-sensitive element and one side of the pair of first electric wires in the first direction, The sealing body is located a predetermined distance from one end of the first cover body in the first direction to the other end.

[0017] In the temperature sensor of the present invention, preferably, A pressing portion is formed on at least one side of the second cover in the third direction.

[0018] In the temperature sensor of the present invention, preferably, The pair of second electric wires includes a pair of core wires and a covering layer covering each of the pair of core wires, the first covering seals the heat sensitive element and one side of the pair of first electric wires in the first direction; The second covering body is The connection portion and the portion on the other side of the first coating are sealed from the portion on the other side of the coating layer of the second electric wire.

[0019] The method for manufacturing a temperature sensor of the present invention includes the steps of: forming a first coating made of a resin material to cover the heat sensitive element and the pair of first electric wires; connecting the first electric wire and the second electric wire; and forming a second coating made of a resin material to cover the connection portion.

[0020] In the method for producing a temperature sensor of the present invention, preferably, The method further includes a step of pressing the second covering. [Effects of the Invention]

[0021] The temperature sensor of the present invention divides the covering body into two parts: a first covering body that covers the sensor element part and a second covering body that covers the connection part, thereby providing a temperature sensor that can be inserted into a narrow space with small dimensions in directions perpendicular to each other and is flexible enough to be bent. [Brief explanation of the drawings]

[0022] [Figure 1] 1A and 1B are diagrams showing a temperature sensor according to a first embodiment of the present invention, where (PV) is a plan view seen from the top side, (SV) is a side view seen from the side, and (FV) is a front view seen from the front (F) side. [Figure 2] FIG. 2 is an enlarged view showing a connection portion according to the first embodiment of the present invention. [Figure 3] 4 is an enlarged view showing a modified example of the bent shape of the first electric wires 12, 12 according to the first embodiment of the present invention. FIG. [Figure 4] 4 is an enlarged view showing a modified example of the bent shape of the first electric wires 12, 12 according to the first embodiment of the present invention. FIG. [Figure 5] 4A and 4B are enlarged views showing modified examples of the bent shapes of the first electric wires 12, 12 and the connection portion according to the first embodiment of the present invention. [Figure 6] FIG. 2 is an enlarged view for explaining a first coating, a second coating, and a connecting portion according to the first embodiment of the present invention. [Figure 7] 1A and 1B show cross-sectional views of a temperature sensor according to a first embodiment of the present invention, where (aa) is a cross-sectional view taken along line VII(a)-VII(a) in FIG. 1, and (bb) is a cross-sectional view taken along line VII(b)-VII(b) in FIG. 1. [Figure 8] 8A and 8B show cross-sectional views of the temperature sensor according to the first embodiment of the present invention, where (aa) is a cross-sectional view taken along line VIII(a)-VIII(a) in FIG. 7, (bb) is a cross-sectional view taken along line VIII(b)-VIII(b) in FIG. 7, (cc) is a cross-sectional view taken along line VIII(c)-VIII(c) in FIG. 7, and (dd) is a cross-sectional view taken along line VIII(d)-VIII(d) in FIG. 7. [Figure 9] 5A and 5B are diagrams illustrating a procedure for providing a coating on the sensor element and the first wire in the embodiment. [Figure 10] 5A to 5C are diagrams for explaining a procedure for providing a coating on a sensor element, a first electric wire, and a second electric wire in the embodiment. [Figure 11] FIG. 10 is an enlarged view showing a connection portion according to a second embodiment of the present invention. [Figure 12] 10A and 10B are diagrams showing a temperature sensor according to a second embodiment of the present invention, in which (PV) is a plan view seen from the top side, (SV) is a side view seen from the side, (FV) is a front view seen from the front (F) side, and (dd) is a cross-sectional view taken along line (d)-(d) in the (PV) diagram. [Figure 13] FIG. 6 is a cross-sectional view showing a connection portion of a temperature sensor according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0023] Two embodiments of the present invention will now be described with reference to the accompanying drawings. 1 and 12, in the temperature sensor 1 according to the first embodiment and the temperature sensor 2 according to the second embodiment, the covering 30 is divided into two parts: a first covering 30A that covers the sensor element 10, and a second covering 30B that covers the connection portion between the first electric wire 12 and the second electric wire 20 of the sensor element 10. Dividing the covering 30 into two parts allows it to be inserted into a narrow space with small dimensions in directions perpendicular to each other, and makes it flexible. While having the above common features, the temperature sensor 1 and the temperature sensor 2 differ in the connection positions of the first electric wires 12, 12 and the second electric wires 20, 20.

[0024] Hereinafter, in the temperature sensors 1 and 2, the length direction L (first direction), width direction W (second direction), and thickness direction T (third direction) are defined as shown in the drawings. The length direction L (first direction) is perpendicular to the width direction W (second direction), and the thickness direction T (third direction) is perpendicular to the length direction L (first direction) and the width direction W (second direction). In addition, in the temperature sensors 1 and 2, the side of the length direction L where the heat sensor 11 is provided is defined as the front or forward (F), and the side where the second electric wire 20 is drawn out is defined as the rear or rear (R). These definitions of front and rear have relative meanings. In the present invention, one side of the length direction L (first direction) is defined as the forward (F), and the other side of the length direction L (first direction) is defined as the rear (R).

[0025] [First embodiment] [Overall configuration: See Figure 1] 1, the temperature sensor 1 according to the first embodiment includes a sensor element 10, a pair of second electric wires 20, 20 electrically connected to the sensor element 10, a first coating 30A made of a resin material that covers the sensor element 10, and a second coating 30B made of a resin material that covers the connection portion 15 between the first electric wire 12 and the second electric wire 20. The second coating 30B is formed so as to overlap a rear portion R in the longitudinal direction L of the first coating 30A.

[0026] [Sensor element 10: see Figure 2] As shown in Figure 2, the sensor element 10 includes a heat-sensing body 11 that detects the temperature of a detection object (not shown), a pair of first electric wires 12, 12 each having one end electrically connected to the heat-sensing body 11, and a sealing body 13 made of an insulating material that seals a portion of the pair of first electric wires 12, 12 and the heat-sensing body 11.

[0027] The heat sensitive element 11 is made of a metal oxide or metal that has the property of changing its electrical resistance value with a change in temperature. Thermistors (Thermally Sensitive Resistors) are preferably used as the metal oxides, typically NTC thermistors (Negative Temperature Coefficient Thermistors) with a negative temperature coefficient, and platinum (e.g., Pt100; JIS-C1604) is preferably used as the metal.

[0028] A pair of electrodes (not shown) is formed on the heat sensitive element 11. One end of a pair of first electric wires 12, 12 is connected to the pair of electrodes. The first electric wire 12 is a conductive wire for passing a constant current through the heat-sensing element 11. A metal material with high electrical conductivity, typically copper, is used for the first electric wire 12, and Dumet wire is preferably used. Dumet wire is a composite wire clad with an inner layer made of an iron-nickel alloy and an outer layer made of copper. While passing a current through this pair of first electric wires 12, 12, the voltage between a pair of electrodes (not shown) of the heat-sensing element 11 is measured, and the resistance value is calculated using Ohm's law (E=IR) to detect the temperature.

[0029] The pair of first electric wires 12, 12 each extend from the heat sensitive element 11 toward the rear R in the longitudinal direction L. The pair of first electric wires 12, 12 have their ends 12a, 12a on the front F side connected to corresponding electrodes of the heat sensitive element 11, and the other ends 12b, 12b on the rear R side connected to the second electric wires 20, 20, respectively. The pair of first electric wires 12, 12 are arranged so that they are parallel to each other in the width direction W in tip regions 12c, 12c, which are portions of a predetermined dimension L1 in the longitudinal direction L from the ends 12a, 12a, respectively. The distance in the width direction W between the tip regions 12c, 12c of the pair of first electric wires 12, 12 is a constant dimension W1. Middle regions 12d, 12d bent away from each other in the width direction W are formed on the rear R side of the end portions 12c1, 12c1 of the tip regions 12c, 12c in the longitudinal direction L. In other words, the end portions 12d1, 12d1 of the middle regions 12d, 12d on the rear R side in the longitudinal direction L are both positioned outward in the width direction W from the end portions 12c1, 12c1 on the front F side. Rear end regions 12e, 12e are formed on the rear R side in the longitudinal direction L from the end portions 12d1, 12d1. These rear end regions 12e, 12e each extend from the end portions 12d1, 12d1 to the rear R side in the longitudinal direction L, and the distance between the rear end regions 12e, 12e in the width direction W is a constant width W2 that is wider than the dimension W1 between two lines in the tip regions 12c, 12c.

[0030] The sealing body 13 is provided to surround the heat sensor 11 and seal it airtight to prevent chemical and physical changes in the heat sensor 11. For example, glass is used as the sealing body 13. In particular, when a Dumet wire is used for the first electric wire 12, the linear expansion coefficient of an iron-nickel alloy is similar to that of glass, so using glass for the sealing body 13 can prevent damage to the sealing body 13 due to thermal expansion of the first electric wire 12. Note that in the present invention, a material other than glass, such as a resin material, may be used for the sealing body 13, and the sealing body 13 may be omitted depending on the environment in which the temperature sensor 1 is used.

[0031] Although a spindle shape is shown as a preferred shape of the plug 13, other shapes such as a sphere may also be used.

[0032] [Another embodiment of the sensor element 10: see FIGS. 3 to 5] As shown in FIG. 2, this embodiment illustrates an example in which the spacing between the first electric wires 12 increases from the intermediate regions 12d toward the rear R side. However, this is not limiting as long as a connection portion 15, which will be described later, can be formed. For example, as shown in FIG. 3, the first electric wires 12 in the intermediate regions 12d may be bent at a right angle in the width direction W, or bent in a stepped manner as shown in FIG. 4, or may extend to the other ends 12b without providing end portions 12d1 as shown in FIG. 5. In the pair of first electric wires 12 shown in FIG. 5, rear end regions 12e1 are integrally formed on the rear R side of the intermediate regions 12d. That is, the rear end regions 12e1 are formed in a straight line from the intermediate region 12d. Regardless of the shape, the intermediate regions 12d, 12d are processed into the above-mentioned shape before being connected to the second electric wires 20, 20.

[0033] [Second electric wire 20: see Figures 1, 6 and 7] The second electric wire 20 is an electric wire that passes current through the first electric wire 12 and electrically connects the sensor element 10 to an external electric circuit or the like. The second electric wires 20, 20 are arranged so that the front F side in the length direction L is electrically connected to the rear R side of the first electric wires 12, 12, and the rear R side faces rearward R in the length direction L, and are parallel to each other. The second electric wire 20 includes a core wire 22 and an electrically insulating coating layer 21 that covers the core wire 22. The outer diameter of the core wire 22 is larger than that of the first electric wire 12.

[0034] The coating layer 21 is made of an electrically insulating resin material. When the coating 30 is formed by heat welding, it is preferable to use a fluororesin as the material for the coating layer 21. Fluororesins have excellent water and oil repellency, chemical resistance, and electrical insulation properties. Examples of fluororesins include PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxyalkane), and FEP (perfluoroethylene-propene copolymer). The melting points of PTFE, PFA, and FEP are 327°C, 310°C, and 260°C, respectively, and are selected appropriately depending on the heating temperature used to weld the resin material that constitutes the coating 30. For example, when welding the coating 30 at a temperature exceeding 300°C, it is preferable to form the coating layer 21 from PTFE or PFA.

[0035] The core wire 22 can be either a solid wire or a twisted wire made by twisting multiple thin conductors, but it is preferable to use a twisted wire that is highly flexible and easy to bend. There is no particular restriction on the material of the core wire 22 as long as it can achieve its purpose, but copper or a copper alloy, which has excellent conductivity, is preferably used.

[0036] As shown in FIG. 6, a tip region 22a where the core wire 22 is exposed from the coating layer 21 is formed on the front F side of the second electric wire 20 in the longitudinal direction L, and an electric circuit or the like (not shown) is connected to the rear R side.

[0037] [Connection 15: See Figures 1, 2, 6, and 7] As shown in FIG. 6 , the connection portion 15 is formed by connecting the first electric wire 12 and the second electric wire 20. Specifically, the connection portion 15 is formed from the rear end region 12e of the first electric wire 12 and the front end region 22a of the second electric wire 20. In this embodiment, the front end region 22a of the second electric wire 20 and the rear end region 12e of the first electric wire 12 are arranged to overlap in the thickness direction T. Then, for example, the front end region 22a of the second electric wire 20 and the rear end region 12e of the first electric wire 12 are connected by resistance welding, soldering, or the like, thereby forming the connection portion 15. Note that the connection portion 15 may be formed using any connection method as long as it can be electrically and physically connected. Therefore, the connection portion 15 is shown schematically in the drawing.

[0038] [Covering body 30: see Figures 1 and 7] As shown in FIG. 1, the coating 30 is composed of a first coating 30A and a second coating 30B. The first coating 30A is mainly responsible for sealing the sensor element 10, and the second coating 30B is mainly responsible for sealing the connection portion 15. The second coating 30B is formed so as to cover a part of the rear R side in the longitudinal direction L of the first coating 30A.

[0039] [First covering 30A: see FIGS. 1, 6, 7, and 8] The first coating 30A is composed of a first inner layer 31A and a first outer layer 32A that covers the first inner layer 31A. As shown in FIGS. 1 and 6, the first coating 30A covers a portion of the pair of first electric wires 12, 12 and the sealing body 13 that seals the heat sensor 11. Specifically, as shown in FIG. 6, the first coating 30A covers the sensor element 10 so that its end 30C1 on the front F side in the longitudinal direction L is located forward of the tip 13a of the sealing body 13 in the longitudinal direction L, and its end 30C2 on the rear R side in the longitudinal direction L is located midway in the tip region 12c of the first electric wire 12. As a result, a tip portion 30C is formed forward of the tip 13a of the sealing body 13. In other words, the sealing body 13 is located a predetermined distance L3 away from the end 30C1 on the front F side, which is one side of the longitudinal direction L of the first coating 30A, and on the rear R side, which is the other side. 1 and 6, the dimension LL1 of the first covering body 30A in the longitudinal direction L, i.e., the dimension between the end 30C1 on the front F side and the end 30C2 on the rear R side in the longitudinal direction L of the first covering body 30A, is sufficiently longer than the dimension LL2 of the second covering body 30B in the longitudinal direction L, which will be described later. This configuration makes it possible for the first covering body 30A to deform more easily than the second covering body 30B.

[0040] The tip portion 30C completely covers the front F side of the sealing body 13 to prevent moisture and the like from entering the interior and damage to the sensor element 10 due to external force from the front F side. The dimension L3 from the end 30C1 of the tip portion 30C to the tip 13a of the sealing body 13 and the dimension W3 in the width direction W at the end 30C1 of the first covering body 30A can be set to any dimension as long as the tip 13a of the sealing body 13 is not exposed. The dimension L3 is preferably 1 mm or more and 3 mm or less.

[0041] 6, a second coating 30B, which will be described later, is superimposed on a portion 30a1 of the first coating 30A on the rear R side, which is the other side in the longitudinal direction L. By superimposing the second coating 30B on the portion 30a1 of the first coating 30A, the first coating 30A is supported in a cantilevered manner by the second coating 30B on the rear R side in the longitudinal direction L. By supporting the first coating 30A in a cantilevered manner by the second coating 30B, when the second coating 30B is fixed to the detection object or a device (both not shown) that is close to the detection object, when an external force is applied to the first coating 30A from a direction other than the longitudinal direction L, the first coating 30A bends (deforms) together with the first wires 12, 12 in the direction of the external force. In this way, by allowing the first coating 30A to bend together with the first wires 12, 12, the temperature sensor 1 can deform to follow the object to be detected and maintain contact with the object. That is, the temperature sensor 1 can be provided with flexibility that allows it to be bent. Note that the dimension of the length direction L of this portion 30a1 can be set arbitrarily, but since there is a possibility that the first coating 30A and the second coating 30B will peel off if the external force described above becomes large, the dimension is determined based on the allowable dimension of the length direction L of the temperature sensor 1 and a dimension that can maintain a strength sufficient to prevent the first coating 30A from peeling off from the second coating 30B due to an expected external force applied to the first coating 30A.

[0042] [First inner layer 31A: see FIG. 6] The first inner layer 31A is intended to protect the sensor element 10 and ensure insulation between the pair of first electric wires 12, 12 of the sensor element 10. The first inner layer 31A is formed so as to cover the sealing body 13 and a part of the pair of first electric wires 12, 12. The first inner layer 31A is preferably made of PFA.

[0043] The first inner layer 31A constitutes the entire inner layer of the first covering body 30A. Specifically, the first inner layer 31A is disposed between the ends 30C1 and 30C2 of the first covering body 30A in the longitudinal direction L. That is, the front end F of the first inner layer 31A in the longitudinal direction L coincides with the end 30C1 of the first covering body 30A, and the rear end R of the first inner layer 31A coincides with the end 30C2 of the first covering body 30A.

[0044] [First outer layer 32A: see FIG. 6] The first outer layer 32A protects the sensor element 10 from external influences (e.g., moisture intrusion and external forces) while maintaining the shape of the first inner layer 31A. The first outer layer 32A is preferably made of heat-shrinkable PTFE. This is because the PFA constituting the first inner layer 31A heated to a temperature at which it becomes fluid shrinks, and the PFA is welded to the sealing body 13 that seals the heat-sensitive element 11 and a portion of the pair of first electric wires 12, 12. The first outer layer 32A is formed so as to cover the entire first inner layer 31A from the end 30C1 of the first inner layer 31A toward the end 30C2 on the rear R side in the longitudinal direction L. In this embodiment, the dimension of the first outer layer 32A in the longitudinal direction L is the same as the dimension of the first inner layer 31A in the longitudinal direction L. Therefore, the front end F of the first outer layer 32A in the length direction L coincides with the end 30C1 of the first covering body 30A, and the rear end R coincides with the end 30C2 of the first covering body 30A.

[0045] As described above, the present embodiment has been described with reference to an example in which the end of the forward F of the first inner layer 31A in the length direction L and the end of the forward F of the first outer layer 32A coincide with the end 30C1 of the first covering body 30A in the length direction L, but the present invention is not limited to this. The end of the forward F of the first inner layer 31A may protrude further forward F than the end of the forward F of the first outer layer 32A, or the end of the forward F of the first outer layer 32A may protrude further forward F than the end of the forward F of the first inner layer 31A. Furthermore, the end of the forward F of the first inner layer 31A may be covered by the first outer layer 32A.

[0046] As shown in FIG. 8, the cross-sectional shape of the first coating 30A in the width direction W is, for example, circular in the range where the sealing body 13 is arranged (see FIG. 8(aa)). The cross-sectional shape of the first coating 30A in the width direction W in the portion covering the tip regions 12c of the pair of first electric wires 12, 12 (see FIG. 8(bb) and FIG. 8(cc)) is generally elliptical. Note that, in this embodiment, the case where each cross-sectional shape is the above-mentioned shape is illustrated, but the present invention is not limited thereto. As long as the first coating 30A can be deformed by an external force, it can be rectangular, triangular, or any other shape.

[0047] [Second covering 30B: see FIGS. 1 and 6] The second coating 30B is formed by a second inner layer 31B and a second outer layer 32B that covers the second inner layer 31B. As shown in Fig. 6, the second coating 30B covers the portion 30a1 of the first coating 30A, the connection portion 15, the tip region 22a of the second electric wire 20, and the tip region 21a of the coating layer 21. The second coating 30B is formed so that its end 30C3 on the front F side in the length direction L is located further forward F than the end 30C2 of the first coating 30A, and its end 30C5 on the rear R side is located midway along the second electric wire 20.

[0048] The dimension LL2 of the second coating 30B in the longitudinal direction L, i.e., the dimension between the end 30C3 on the front F side and the end 30C5 on the rear R side in the longitudinal direction L of the second coating 30B, is shorter than the dimension LL1 of the first coating 30A. Note that the dimension LL2 of the second coating 30B may be larger than the dimension LL1 of the first coating 30A as long as it can cover and seal the portion 30a1 of the first coating 30A, the connection portion 15, the tip region 22a of the second electric wire 20, and the tip region 21a of the coating layer 21.

[0049] The second covering body 30B is composed of a tip portion 30b1 that covers the rear R side in the longitudinal direction L of the first covering body 30A, and a rear end portion 30b2 that covers the connection portion 15 and the front F side in the longitudinal direction L of the second electric wire 20.

[0050] [Tip portion 30b1: see Figure 6] The tip portion 30b1 is a portion that holds the first coating 30A while sealing the rear R-shaped end 30C2 of the first coating 30A in the length direction L. Specifically, the tip portion 30b1 is formed to overlap the portion 30a1 of the first coating 30A, and the front F-shaped end 30C3 in the length direction L is located forward F of the rear R-shaped end 30C2 of the first coating 30A, and the rear R-shaped end 30C4 is located rear R of the end 30C2 of the first coating 30A. This configuration allows the tip portion 30b1 of the second coating 30B to cover the rear R-shaped end 30C2 of the first coating 30A. This is to prevent liquids such as water or dust from entering the temperature sensor 1 through the rear R-shaped end 30C2 of the first coating 30A. The tip portion 30b1 extends linearly in the longitudinal direction L, and its dimension in the longitudinal direction L, i.e., the dimension L4 between the front F end 30C3 and the rear R end 30C4 in the longitudinal direction L, is set to a length equal to or greater than the dimension in the longitudinal direction L of the portion 30a1 of the first covering body 30A described above.

[0051] [Rear end portion 30b2: see FIGS. 1 and 6] As shown in FIG. 6 , the rear end portion 30b2 seals and holds the connection portion 15, the tip region 22a of the second electric wire 20, and the tip region 21a of the coating layer 21. The rear end portion 30b2 is formed contiguous with the end 30C4 on the rear R side in the longitudinal direction L of the tip portion 30b1 and extends in the longitudinal direction L. As shown in FIG. 1 , the dimension T2 of the rear end portion 30b2 in the thickness direction T is larger than the dimension T1 of the first coating 30A in the thickness direction T. Here, the dimension T1 of the first coating 30A in the thickness direction T refers to the dimension in the thickness direction T excluding the area where the dimension in the thickness direction T is increased by the sealing body 13. Also, as shown in FIG. 6 , the dimension W5 of the rear end portion 30b2 in the width direction W is larger than the dimension W6 of the first coating 30A in the width direction W. This is because the rear end portion 30b2 seals the tip region 21a of the coating layer 21. Therefore, on both sides in the width direction W of the rear end portion 30b2 on the front F side in the longitudinal direction L, inclined portions 30b3, 30b3 are formed that continue from the end 30C4 on the rear R side of the front end portion 30b1 and incline outward in the width direction W. Specifically, the ends 30b4, 30b4 of the inclined portions 30b3, 30b3 in the width direction W form the width direction ends of the end 30C4 on the rear R side of the front end portion 30b1. The rear end portion 30b2 extends rearward R from these ends 30b4, 30b4. The inclined portions 30b3, 30b3 are merely an example, and in addition to the inclined shape shown in FIG. 1, etc., they may be formed to extend in the width direction W or may have a curved shape.

[0052] The rear end portion 30b2 extends linearly from the rear R end portion of the inclined portions 30b3, 30b3 in the longitudinal direction L toward the rear R side, and the dimension W5 between the two sides in the width direction W is larger than the dimension W4 between the two outer sides of the second electric wires 20, 20 when the second electric wires 20, 20 are arranged side by side in the width direction W. The rear end portion 30b2 extends linearly from the ends 30b4 toward both ends 30b5 of the rear R-shaped end 30C5.

[0053] The cross-sectional shape of the second coating 30B will be described with reference to FIGS. 6 and 8. As shown in FIGS. 8(cc) and 8(dd), the second coating 30B is formed from a second inner layer 31B and a second outer layer 32B. The cross-sectional shapes of the front end portion 30b1 and the rear end portion 30b2 are such that the upper surface 35 and the lower surface 36 are flat, and the side surface 37 connecting the upper surface 35 and the lower surface 36 is arc-shaped. While the present embodiment illustrates an example in which the side surface 37 is arc-shaped, this is not limiting as long as the function is ensured. That is, the cross-sectional shape in the cross section may be circular, elliptical, or other shapes as long as the first coating 30A and the second electric wire 20 can be held and the connection portion 15 can be sealed. Furthermore, the upper surface 35 and the lower surface 36 are not limited to being flat, and may be formed in various shapes, such as arc-shaped.

[0054] As shown in Figure 6, the second inner layer 31B is formed to cover the portion 30a1 on the rear R side, which is the other side of the longitudinal direction L of the first coating 30A, the portions of the first electric wires 12, 12 exposed from the first coating 30A, the connection portion 15, the tip region 22a of the second electric wire 20, and the tip region 21a on the front F side of the longitudinal direction L of the second electric wire 20.

[0055] The second outer layer 32B extends from the end 30C3 of the second inner layer 31B toward the end 30C5 on the rear R side in the longitudinal direction L, and is formed so as to cover the second inner layer 31B. In this embodiment, the dimension of the second outer layer 32B in the longitudinal direction L is the same as the dimension of the second inner layer 31B in the longitudinal direction L. Therefore, the front F end of the second inner layer 31B in the longitudinal direction L coincides with the end 30C3 of the second covering body 30B, and the rear R end coincides with the end 30C5 of the second covering body 30B.

[0056] With the above-described configuration, the second covering 30B provides waterproofing and dustproofing for the connection portion 15 to which the first electric wires 12, 12 and the second electric wires 20, 20 are connected. While the present invention illustrates a case in which the front F end and rear R end of the second outer layer 32B in the longitudinal direction L coincide with the front end 30C3 and rear end 30C5 of the second covering 30B, respectively, as with the second inner layer 31B, the present invention is not limited thereto. As with the first covering 30A, the front F end 30C3 of the second inner layer 31B may protrude further forward than the front F end of the second outer layer 32B, or the front F end of the second outer layer 32B may protrude further forward than the front F end of the second inner layer 31B. Furthermore, the front F end of the second inner layer 31B may be covered by the second outer layer 32B. The same applies to the rear R end 30C5.

[0057] In this embodiment, the outer diameter of each coating layer 21 of a pair of parallel arranged second electric wires 20, 20 is larger than the outer diameter of each of a pair of parallel arranged first electric wires 12, 12, so the dimension W5 in the width direction W and the dimension T2 in the thickness direction T of the second coating body 30B are larger than the dimension W6 in the width direction W and the dimension T1 in the thickness direction T of the first coating body 30A.

[0058] As described above, in this embodiment, the coating 30 is not configured as a single unit, but is configured from two elements, the first coating 30A and the second coating 30B, for the following reasons.

[0059] When the entire covering 30 is constructed as a single unit, PFA and PTFE tubes (collectively referred to as large-diameter tubes) are used, each having an inner diameter based on the second electric wires 20, 20, which have a larger wire diameter than the first electric wires 12, 12. However, these large-diameter tubes have an outer diameter significantly larger than that of the first electric wires 12, 12. Furthermore, the larger the diameter of the tube, the thicker the tube becomes. If the heat treatment described below is performed while the first electric wires 12, 12 are covered with this large-diameter tube, the first electric wires 12, 12 are not only sealed, but also an excess resin-welded portion made of PFA and PTFE remains in the area where the first electric wires 12, 12 are located. This makes it impossible to reduce the dimensions of the area where the first electric wires 12, 12 are located. In contrast to the above, in this embodiment, the first covering 30A and the second covering 30B are configured separately using tubes having dimensions corresponding to the diameters of the first electric wires 12, 12 and the second electric wires 20, 20. Therefore, the dimensions of the first covering 30A corresponding to the first electric wires 12, 12 can be reduced.

[0060] [Manufacturing procedure for temperature sensor 1: see Figures 9 and 10] Next, a procedure for manufacturing the temperature sensor 1 will be described. The method includes step A, which forms a first coating 30A and includes the following, and step B, which forms a second coating 30B and includes the following. Step A includes the following three steps, step A1 to step A3, and step B includes the following two steps, step B1 and step B2. Step A and step B will be described in the order below, but it is assumed that the sensor element 10 has already been obtained. Step A: Step A1: Cover the sensor element 10 with a tubular PFA that constitutes the first inner layer 31A. Step A2: Covering with tubular PTFE constituting the first outer layer 32A and heat treatment Step A3: Electrically connect the sensor element 10 and the second electric wires 20, 20 Step B: Step B1: The tubular PFA constituting the second inner layer 31B and the tubular PTFE constituting the second outer layer 32B are sequentially covered and heat-treated. Step B2: Pressurizing the second inner layer 31B and the second outer layer 32B

[0061] <Step A1: Figure 9 (PV-1)> The sensor element 10 and three tubular PFAs constituting the first inner layer 31A are prepared. The three tubular PFAs are formed into any one of cylindrical shapes and comprise two first tubes 91, 91 that are inserted through the pair of first electric wires 12, 12, respectively, and a second tube 92 that covers the periphery of the sealing body 13 of the sensor element 10. Then, after the pair of first electric wires 12, 12 are covered with the first tubes 91, 91, the second tube 92 is inserted so as to overlap the sealing body 13.

[0062] <Step A2: Figure 9 (PV-2)> Next, the sensor element 10 covered with the first tube 91 and the second tube 92 obtained in step A1 and the third tube 93 made of PTFE that forms the first outer layer 32A are prepared. Then, the sensor element 10 covered with the first tube 91 and the second tube 92 obtained in step A1 is inserted into the third tube 93.

[0063] Thereafter, heat H is applied from the outside of the third tube 93 to heat it to a predetermined temperature. At this time, the first tube 91 and the second tube 92 are heated to a temperature at which they become fluid and the third tube 93 begins to thermally shrink. As a specific example, the third tube 93 is heated to a temperature between 320°C and 370°C. The first tube 91 and the second tube 92 are heated to a temperature at which they become fluid, and together with the thermal shrinkage of the third tube 93, they are welded to the sensor element 10, and the melted first tube 91 and second tube 92 form the first inner layer 31A, and the thermally shrunk third tube 93 forms the first outer layer 32A, thereby forming a first coating 30A consisting of the first inner layer 31A and the first outer layer 32A.

[0064] <Step A3: Figure 9 (PV-3)> The sensor element 10 having the first coating 30A and the pair of second electric wires 20 are prepared. Next, the rear R sides of the pair of first electric wires 12 are bent so that the spacing between the pair of first electric wires 12 is dimension W2, thereby forming the intermediate regions 12d and the rear end regions 12e. The rear end regions 12e of the first electric wires 12 are then positioned at predetermined positions on the core wires 22 of the second electric wire 20, and then connected by welding such as resistance welding, soldering, or the like to form the connection portion 15.

[0065] <Step B1: Figure 10 (SV-1)> Next, a cylindrical fourth tube 94 made of PFA and constituting the second inner layer 31B, and a cylindrical fifth tube 95 made of PTFE and constituting the second outer layer 32B are prepared. Then, the fourth tube 94 is placed so as to cover the front end portion 30b1 and the rear end portion 30b2, and the fifth tube 95 is placed so as to cover the fourth tube 94.

[0066] Thereafter, heat H is applied from the outside of the fifth tube 95 to heat it to a predetermined temperature. At this time, the fourth tube 94 is heated to a temperature at which it becomes fluid, and the fifth tube 95 is further heated to a temperature at which it thermally shrinks. As a specific example, the fifth tube 95 is heated to a temperature between 350°C and 400°C.

[0067] The fourth tube 94, heated to a temperature at which it becomes fluid, is welded to the sensor element 10 along with the thermal shrinkage of the fifth tube 95, and the molten fourth tube 94 forms the second inner layer 31B, and the thermally shrunk fifth tube 95 forms the second outer layer 32B, thereby forming a second coating body 30B consisting of the second inner layer 31B and the second outer layer 32B.

[0068] <Step B2: Figure 6, Figure 10 (SV-2), (ff)> Finally, a press machine is prepared that applies pressure to the second coating 30B using a flat surface. Following the heating process, while the resin material of the second inner layer 31B and the second outer layer 32B is softened, pressure P is applied to the second coating 30B in the thickness direction T. Then, as shown in FIG. 1(ff), a pressing process using the prepared press machine forms a flat pressed portion on either or both of the upper surface 35 and the lower surface 36 of the second coating 30B in the thickness direction T. Furthermore, the cross section of the area extending from the connection portion 15 to the tip region 21a of the second electric wire 20 changes from a cylindrical shape to an oval shape with flat pressed surfaces on the upper surface 35 and the lower surface 36. The second coating 30B then cools and hardens, thereby forming the second coating 30B.

[0069] By applying pressure P in the thickness direction T, the softened second inner layer 31B filling the spaces between the first electric wires 12, 12 expands in the width direction W, and the first electric wires 12, 12 are fixed in the position shown in FIG. 6 . As the softened second inner layer 31B expands in the width direction W, the spacing between the first electric wires 12, 12 increases, making it easier to ensure electrical insulation between the electric wires. Furthermore, in the region of the second coating 30B where pressure P is applied, the spacing between the core wires 22, 22 in the width direction W also increases. In other words, the spacing between the core wires 22, 22 sealed in the second coating 30B in the width direction W becomes wider than before the pressed portion is formed by press processing. As a result, it is easier to ensure insulation between the core wires 22, 22.

[0070] [effect] The effects achieved by the temperature sensor 1 will be described. <First effect> The temperature sensor 1 includes a pair of first electric wires 12, 12, a pair of second electric wires 20, 20 electrically connected to each of the pair of first electric wires 12, 12 at a connection portion 15, a first coating 30A made of a resin material that covers the heat sensor 11 and the pair of first electric wires 12, 12, and a second coating 30B made of a resin material that covers the connection portion 15.The temperature sensor 1 is flexible enough to be bent, and can be inserted into narrow spaces with small dimensions in directions perpendicular to each other.

[0071] <Second effect> The pair of second electric wires 20 includes a pair of core wires 22 and a coating layer 21 that covers each of the pair of core wires 22. The second coating 30B covers not only the connection portion 15 but also the other side portion 30a1 of the first coating 30A and the tip region 21a on one side of the coating layer 21 of the second electric wire 20. With this configuration, when an external force is applied to the first coating 30A from a direction other than the longitudinal direction L, the first coating 30A bends together with the first electric wires 12 in the direction of the external force. As a result, the first coating 30A deforms in response to the detection object, and the detection object and the temperature sensor 1 can maintain contact with each other.

[0072] <Third Effect> If the direction perpendicular to the first direction L in which the pair of first electric wires 12 are aligned is defined as a second direction W, then the dimension W5 of the second coating 30B in the second direction W is larger than the dimension W6 of the first coating 30A in the second direction W. With this configuration, even if the first coating 30A is formed narrow or thin, it is possible to easily deform the first coating 30A in the width direction W without impairing the ease of fixing the temperature sensor 1 of the present invention to a device or the like that is located close to a detection target.

[0073] Similarly, the dimension T2 of the second coating 30B in the third direction T, which is perpendicular to the first direction L and the second direction W, is larger than the dimension T1 of the first coating 30A in the third direction. With this configuration, even if the first coating 30A is formed narrow or thin, the first coating 30A can be easily deformed in the thickness direction T without impairing the ease of fixing the temperature sensor 1 of the present invention to a device or the like that is close to the object to be detected.

[0074] The dimension LL1 of the first coating 30A in the first direction L is larger than the dimension LL2 of the second coating 30B in the first direction L. With this configuration, the first coating 30A can be deformed more easily than the second coating 30B.

[0075] <Fourth Effect> Since the distance between each of the pair of first electric wires 12, 12 increases toward the other side in the first direction L, the dimension between the first electric wires 12, 12 can be increased, and the insulation between the first electric wires 12, 12 can be improved.

[0076] <Fifth Effect> The sensor element 10 further includes a seal 13 made of an insulating material that seals the heat sensitive element 11 and one side of the pair of first electric wires 12 in the first direction L, and the seal 13 is located a predetermined distance from one end of the first covering body 30A on the other side in the first direction L. With this configuration, the front F side of the seal 13 is completely covered, preventing moisture and the like from entering the interior and damage to the sensor element 10 due to external force from the front F side.

[0077] <Sixth Effect> The method for manufacturing the temperature sensor 1 includes step A, which forms the first covering 30A and includes the following, and step B, which forms the second covering 30B and includes the following. Before the rear end region 12e is connected to the core wires 22, 22, the tubular PFA constituting the first inner layer 31A is placed on each of the pair of first electric wires 12, 12, so that the entire circumference of the pair of first electric wires 12, 12 is completely covered. This makes it easier to ensure electrical insulation performance.

[0078] [Second embodiment: see Figures 11, 12, and 13] In the temperature sensor 1 according to the first embodiment, the connection portion 15 is formed by overlapping the rear end region 12e of the first electric wire 12 and the front end region 22a of the second electric wire 20 in the thickness direction T and then connecting them by resistance welding or the like, but the temperature sensor 2 according to the second embodiment differs in that the rear end region 12e2 of the first electric wire 12 and the front end region 22a of the second electric wire 20 are overlapped in the width direction W. Note that the same elements as in the first embodiment are denoted by the same reference numerals as in Figures 1 and 2 and their description will be omitted.

[0079] [Temperature sensor 2: See Figures 11 and 12] Similar to the sensor element 10 of the first embodiment, the sensor element 50 used in the temperature sensor 2 of the second embodiment has an intermediate region 12d' bent away from each other in the width direction W on the rear R side from the end portions 12c1, 12c1 on the rear R in the longitudinal direction L of the tip regions 12c, 12c of the pair of first electric wires 12, 12. The end portion 12d2 on the rear R side in the longitudinal direction L of the intermediate region 12d' is positioned outside the width direction W of the end portion 12c1 on the front F side, similar to the end portion 12d1 of the intermediate region 12d in the first embodiment, but its position is positioned outside the end portions 12d1, 12d1 in the first embodiment. Specifically, the end portions 12d2, 12d2 are set to be outside the positions of the outer sides 22b, 22b of the core wires 22, 22 of the second electric wires 20, 20 in the width direction W. Rear end regions 12e2, 12e2 are formed on the rear R side of the ends 12d2, 12d2 in the longitudinal direction L. The rear end regions 12e2, 12e2 extend in parallel to each other toward the rear R in the longitudinal direction L at the connection portion 15 connected to the pair of second electric wires 20, 20. The rear end regions 12e2, 12e2 of the pair of first electric wires 12, 12 are connected to the outer sides of the core wires 22, 22 in the width direction W by welding or the like.

[0080] [Positional relationship between the rear end region 12e2 and the core wire 22: FIG. 13] The first electric wire 12 is positioned outside a line C in the thickness direction T that passes through the center of the core wire 22, and it is preferable that the rear end region 12e2 is positioned within the range of 45 degrees≦α≦135 degrees, where α is the angle when the thickness direction T is set to zero degrees.

[0081] By arranging the rear end regions 12e2 of the pair of first electric wires 12 as described above, the connection portions 15 formed by welding such as resistance welding, soldering, etc. can be formed at positions farther apart from each other. As a result, compared to the first embodiment, a larger physical distance can be ensured between the connection portions 15 and between the electric wires in the rear end regions 12e2, making it easier to ensure electrical insulation performance between the two wires.

[0082] In addition to the above, the configurations given in the above embodiments can be selected or changed as appropriate to other configurations without departing from the spirit of the present invention.

[0083] In the procedure for manufacturing the temperature sensor 1, the tubular PTFE that constitutes the first outer layer 32A is applied in step A2, a heat treatment is performed, and then the sensor element 10 and the second electric wires 20, 20 are electrically connected in step A3. However, the order of steps is not limited to this. Step A3 may precede step A2. Specifically, after the step of electrically connecting the sensor element 10 and the second electric wires 20, 20 in step A3, the tubular PTFE that constitutes the first outer layer 32A may be applied in step A2, and a heat treatment may be performed.

[0084] In addition, in step B, the heat treatment in step B1 is performed followed by the pressure treatment in step B2. However, the pressure treatment may be started as soon as the heat treatment reaches a predetermined temperature, and the heat treatment and pressure treatment may be performed in parallel.

[0085] Furthermore, although the first embodiment illustrates the pressure treatment using a press machine, the pressure treatment may be performed by rolling.

[0086] Furthermore, the first inner layer 31A is formed of a single layer of PFA, but is not limited to this. The first inner layer 31A may be formed of a total of two layers: a layer of PI (polyimide) and a layer of PFA covering the PI. Note that, because the first inner layer 31A is formed of PI and PFA, it is easier to ensure insulation between the first electric wires 12, 12 within the area sealed by the first coating 30A than in the temperature sensors 1 and 2 of the first and second embodiments.

[0087] The temperature sensor may also include a sensor element 10 having a heat-sensitive body 11 and a pair of first electric wires 12, 12 electrically connected to the heat-sensitive body 11 on one side in the longitudinal direction L and drawn out toward the other side in the longitudinal direction L, a pair of second electric wires 20, 20 electrically connected to each of the pair of first electric wires 12, 12 at their connection portions, a first coating 30A made of a resin material that covers the heat-sensitive body 11 and the pair of first electric wires 12, 12, and a second coating 30B that covers the other side portion in the longitudinal direction L of the first coating 30A.

[0088] Such a temperature sensor can be inserted into a narrow space with small dimensions in mutually orthogonal directions, and is flexible enough to be bent, allowing the second cover 30B to be used as a holder for the temperature sensor. [Explanation of symbols]

[0089] 1 temperature sensor 2 Temperature Sensors 10 Sensor element 11 Heat-sensitive element 12 First Electric Wire 12a one end 12b other end 12c tip area 12c1 end 12d,12d' intermediate area 12d1 End 12e,12e1,12e2 Posterior area 13 Sealing body 13a Tip 15 Connection 20 Second Wire 21 Covering layer 21a Tip area 22 core wire 22a Tip area 30 Covering 30A 1st covering 30a1 part 30B 2nd covering 30b1 Tip 30b2 Rear end 30C tip 30C1, 30C2, 30C3, 30C4, 30C5 terminals 31A Inner Layer 1 31B Second Inner Layer 32A First Outer Layer 32B Second Outer Layer 35 above 36 Below 37 Side View C line H heat L1,L3,L4 inch method P pressure W1,W2,W3,W4,W5 inch method α angle

Claims

1. a sensor element including a heat-sensitive body and a pair of first electric wires electrically connected to the heat-sensitive body on one side in a first direction and drawn out toward the other side in the first direction; a pair of second electric wires electrically connected to the pair of first electric wires at connection portions; a first coating made of a resin material that covers the heat-sensitive element and the pair of first electric wires; a second coating made of a resin material that covers the connection portion, a direction perpendicular to the first direction and in which the pair of first electric wires are arranged is defined as a second direction, and a dimension of the second coating in the second direction is larger than a dimension of the first coating in the second direction; Temperature sensor.

2. The pair of second electric wires includes a pair of core wires and a covering layer covering each of the pair of core wires, The second covering body is In addition to the connection portion, the first coating covers from the other side portion of the first coating to the one side portion of the coating layer of the second electric wire. The temperature sensor of claim 1 .

3. a dimension of the second coating in a third direction perpendicular to the first direction and the second direction is larger than a dimension of the first coating in the third direction; The temperature sensor of claim 1 .

4. a dimension of the first coating in the first direction is larger than a dimension of the second coating in the first direction; The temperature sensor according to claim 3 .

5. the pair of first electric wires are connected to each other on the outer sides of the pair of second electric wires in the second direction; The temperature sensor according to claim 4.

6. The distance between the pair of first electric wires increases toward the other side in the first direction. The temperature sensor according to claim 5 .

7. A sensor element comprising a heat-sensitive body and a pair of first electric wires electrically connected to the heat-sensitive body on one side in a first direction and drawn out toward the other side in the first direction; a pair of second electric wires electrically connected to the pair of first electric wires at connection portions; a first coating made of a resin material that covers the heat-sensitive element and the pair of first electric wires; a second coating made of a resin material that covers the connection portion, The pair of second electric wires includes a pair of core wires and a covering layer covering each of the pair of core wires, The second covering body is In addition to the connection portion, the first coating covers a portion from the other side of the first coating to a portion on the one side of the coating layer of the second electric wire, the first covering body is configured by a first inner layer and a first outer layer covering the first inner layer, The second covering body is composed of a second inner layer and a second outer layer covering the second inner layer. Temperature sensor.

8. the first inner layer and the second inner layer are made of PFA, The first outer layer and the second outer layer are made of PTFE. The temperature sensor according to claim 7.

9. The sensor element is a seal made of an insulating material that seals the heat-sensitive element and the one side in the first direction of the pair of first electric wires; the sealing body is located a predetermined distance from the end of the first cover body on the one side in the first direction to the other side; 9. The temperature sensor according to claim 1.

10. a pressing portion is formed on at least one side of the second cover in the third direction; The temperature sensor according to claim 3 .

11. A sensor element comprising a heat-sensitive body and a pair of first electric wires electrically connected to the heat-sensitive body on one side in a first direction and drawn out toward the other side in the first direction; a pair of second electric wires electrically connected to the pair of first electric wires at connection portions; a first coating made of a resin material that covers the heat-sensitive element and the pair of first electric wires; a second coating made of a resin material that covers the connection portion, The pair of second electric wires includes a pair of core wires and a covering layer covering each of the pair of core wires, the first covering seals the heat sensitive element and the one side of the pair of first electric wires in the first direction; The second covering body is a sealing portion extending from the connection portion and the portion on the other side of the first coating to the portion on the one side of the coating layer of the second electric wire; Temperature sensor.

12. A method for manufacturing the temperature sensor according to claim 1, forming the first coating made of a resin material to cover the heat-sensitive element and the pair of first electric wires; connecting the first electric wire and the second electric wire; forming the second coating made of a resin material to cover the connection portion; A method for manufacturing a temperature sensor comprising:

13. and pressing the second covering. The method for manufacturing the temperature sensor according to claim 12.

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