JPH06300644A - Temperature sensor - Google Patents

Abstract

PURPOSE:To provide a highly durable temperature sensor excellent in thermal response in which the heat-sensitive part can attain press contact force stably. CONSTITUTION:The temperature sensor comprises a heat-sensitive element 23 comprising a heat-sensitive part 22 and lead wires 22a, 22b extending therefrom, a resilient metallic supporting plate 20 having an opening 26 larger than the heat-sensitive part 22, electrode terminals 25a, 25b connected with the lead wires 22a, 22b, a holder 21 planted with the supporting board 20 and the electrode terminals 25a, 25b, and a thin film sheet 24 covering the heat-sensitive part 22 disposed at the opening 26 and the supporting board 20 while contacting with an object on the side contacting with the heat-sensitive part 22.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature sensor for detecting a temperature by contacting a detected object, and more particularly, a temperature sensor for detecting a temperature of a heat-generating rotating body or a stationary body used in a fixing device such as a copying machine. It relates to a sensor.

[0002]

2. Description of the Related Art Conventionally, an example of a temperature sensor for detecting the temperature of a heat generating rotating body or a stationary body used in a fixing device of a copying machine is disclosed in Japanese Utility Model Laid-Open No. 63-163431. . FIG. 9A shows the above temperature sensor in a perspective view, in which the thermosensitive element 1 comprises a thermosensitive portion 2 and a lead wire 3, the lead wire 3 is connected to the covered electric wire 5, and the insulating tube 6 is provided. Are each covered with. The heat sensitive part 2 is placed in contact with the plate surface of a substrate 7 made of a T-shaped elastic metal plate, and the heat sensitive element 1 is placed on the heat sensitive part 2. The heat sensitive part 2 is covered with a resin 8 having good thermal conductivity. The lead wire 3 and the covered electric wire 5 are fixed by cutting and bending claws 7a and 7b provided on the substrate 1.

Further, as shown in FIG. 9 (b), the lead wire 3 and the covered electric wire 5 of the heat sensitive element 1 are fixed by cutting and bending claws 7a and 7b, and the lead wire 3 and the covered electric wire 5 are connected. The crimp stoppers 10a and 10b are fixed in a shifted manner to prevent a short circuit. As shown in FIG. 9C, in order to improve the thermal response of the temperature sensor, the heat-sensitive portion 2 of the heat-sensitive element 1 is partially exposed through the opening 9 provided in the substrate 7. ing. In this temperature sensor, an elastic metal substrate 7 that supports the heat-sensitive element 1 and a resin coating 8 that covers the heat-sensitive portion 2 of the heat-sensitive element 1 are formed of a material having good thermal conductivity.
It is intended to quickly measure the surface temperature of the object to be detected by placing the object in contact with the object to be detected. Further, the structure of this temperature sensor is extremely simple, and an attempt is made to provide a temperature sensor having a good thermal response.

[0004]

However, in the temperature sensor shown in FIG. 9, the lead wire 3 of the thermosensitive element 1 and the covered electric wire 5 are connected to each other, and two cutting and bending claws 7a and 7b provided on the substrate 7 are provided. Then, the lead wire 3 and the covered electric wire 5 of the thermosensitive element 1 are pressed and fixed to the substrate. The covered electric wire 5 is
It is fixed to portions near the screw fixing holes 11a and 11b for fixing the substrate 7, and the lead portion of the thermosensitive element 1 is fixed by the cutting and bending claw 7a. In this temperature sensor, the elastic force of the insulating tube or the covered electric wire acts on the elastic force of the substrate, and as shown in FIG. 9B, the caulking stoppers 10a and 10b are attached.
They are arranged in different steps to prevent mutual contact. As a result, the elastic forces of both the substrate and the coated wire act, and the elastic force of the temperature sensor varies due to the difference in the connection position between the lead wire of the thermosensitive element and the coated wire, resulting in insufficient contact with the detected object. There is an easy drawback.

Further, when the heat-sensitive part of the temperature sensor is brought into contact with the heat generating rotating body which is the object to be detected to detect the temperature, the above-mentioned temperature sensor substrate has the same width from the mounting plate part to the tip. Depending on the contact angle with the object to be detected, the elasticity of the substrate may not work sufficiently and the heat-sensitive part may not be able to contact sufficiently, and the heat-sensitive part rises, and the thermal response and detection sensitivity deteriorate. is there. Further, the heat sensitive portion 2 of the heat sensitive element is partially exposed through the opening 9 provided on the plate surface of the substrate 7 to improve the thermal response, but the opening 9 is the heat sensitive portion 2 of the heat sensitive element.
Since the size is smaller than the size of the
As a result, the heat absorbed by the heat sensitive portion 2 is dissipated through the substrate 7 having good conductivity, and the thermal response is insufficiently improved. From the above-mentioned viewpoint, this temperature sensor has a drawback that the heat-sensitive part is point-contacted with the object to be sensed due to the contact angle of the temperature sensor, resulting in poor thermal response and difficult temperature sensing accurately. There is.

The present invention has been made in view of the above-mentioned drawbacks, and provides a temperature sensor having excellent thermal responsiveness, a stable pressure contact force of the heat sensitive portion, and good durability. The purpose is.

[0007]

In order to achieve the above object, the temperature sensor of the present invention comprises a heat sensitive element having a heat sensitive portion and a lead wire extending from the heat sensitive portion, and an opening portion larger than the heat sensitive portion. An elastic support plate provided with a recess, an electrode terminal to which the lead wire is connected, a holding body in which the support plate and the electrode terminal are implanted, and the opening or the recess. In addition, a thin film sheet is provided, which covers the heat-sensitive portion and the tip portion of the support plate, and has a contact surface of the heat-sensitive portion as a contact surface with the object to be detected.

The temperature sensor of the present invention comprises a heat-sensitive element having a heat-sensitive portion and a lead wire extending from the heat-sensitive portion, an elastic support plate having an opening or a recess larger than the heat-sensitive portion, and An electrode terminal to which a lead wire is connected, a support body in which the support plate and the electrode terminal are implanted, and a first thin film sheet serving as a contact surface with a detection target on one surface of the support plate, A filling material surrounding the heat sensitive portion arranged in the opening or the recess; and a second thin film sheet for covering the support plate on which the heat sensitive portion is arranged with the first thin film sheet, It is a feature.

The temperature sensor of the present invention comprises a heat sensitive element having a heat sensitive portion and a lead wire extending from the heat sensitive portion, first and second electrode terminals to which the lead wire is connected, and a tip of the wide portion. An opening or a recess larger than the heat-sensitive portion is formed,
An elastic support plate in which the heat sensitive element is arranged in the opening or the recess, a holding body in which the support plate and the first and second electrode terminals are implanted, and the opening or the recess It is characterized by comprising a thin film sheet which covers the heat sensitive portion and the supporting plate which are arranged.

The temperature sensor of the present invention comprises a heat sensitive element having a heat sensitive portion and a lead wire extending from the heat sensitive portion, first and second electrode terminals to which the lead wire is connected, and the second electrode. A support plate in which an opening or a recess larger than the heat-sensitive part is formed at the tip of a wide part extending from a narrow part that is a terminal for use, and the support plate and the first electrode terminal are implanted. It is characterized by comprising a holder, and a thin film sheet which covers the heat sensitive portion and the support plate which are arranged in the opening or the recess.

In the temperature sensor of the present invention, each of the temperature sensors described above is provided with a through hole and a recess or protrusion in the holder, and an insertion groove for inserting the lead wire. It is a feature. The temperature sensor of the present invention is characterized in that each of the temperature sensors described above is provided with a notch or a slit-like notch in a wide portion of the support plate to give elasticity to the support plate.

[0012]

With the above-described means, the temperature sensor of the present invention is arranged such that the opening or recess formed in the wide portion of the support plate is formed to be relatively larger than the heat-sensitive portion so that the heat-sensitive portion is disposed in the opening or recess. In this case, the heat-sensitive part of the temperature sensor should not directly contact the support plate so that the temperature absorbed by the heat-sensitive part does not dissipate through the support plate having a large heat capacity.
The thermal response is improved. Further, by surrounding the heat-sensitive portion with a filler having a small heat capacity and good thermal conductivity, heat absorption by the heat-sensitive portion is facilitated. Further, by disposing the heat-sensitive part of the heat-sensitive element in the opening or the recess formed in the support plate, the heat-sensitive element can be arranged at an accurate position, and the through-hole and the protrusion formed in the holder or By the concave portion, the temperature sensor can be fixed to the detected body at two points, so that the temperature sensor can be fixed at an accurate position and the positional deviation of the heat sensitive portion can be reduced.
Also, the lead wire of the heat-sensitive element should be joined to the electrode terminal protruding from the holder to eliminate the left-right unevenness of the elasticity of the support plate, and the width of the wide support plate should be cut out to reduce the width. Alternatively, by forming fine cutouts or slit-like cutouts, the support plate is given appropriate elasticity so that the contact angle with the object to be detected becomes zero. Further, by forming the support plate and the electrode terminals by using the lead frame, automation of assembly is promoted.

[0013]

Embodiments of the temperature sensor according to the present invention will be described below with reference to the drawings. FIG. 1A is a plan view showing an embodiment of the temperature sensor according to the present invention.
1B is a sectional view taken along line XX 'in FIG. 1A, and FIG. 1C is a sectional view taken along line YY'. Hereinafter, regarding the temperature sensor of the present invention, FIG.
Describing with reference to (b) and (c), 20 is a metallic support plate, 21 is a resin-molded holder, and 23 is the support plate 2.
0 is a heat sensitive element made of a glass bead type thermistor or the like, 24 is a thin film sheet made of a polyimide sheet, and 25 is an electrode terminal. The support plate 20 is made of a metal plate having elasticity, and a relatively large opening 26 is formed at the tip of the wide portion of the support plate 20.
Are planted in the holder 21. The holding body 21 has a through hole 21a for fixing a screw or a screw for fixing the temperature sensor to the detected body, and a protrusion 21 for preventing the temperature sensor from rotating.
b or the concave portion 21e is formed, and the lead wire 22
Insertion grooves 21c and 21d through which a and 22b are inserted are provided.

Opening 2 formed at the tip of support plate 20
In FIG. 6, the heat-sensitive portion 22 of the heat-sensitive element 23 is arranged substantially in the center of the opening 26 without contacting the support plate 20, and the lead wires 22 a and 22 b thereof are respectively inserted into the insertion groove 2 of the holding body 21.
1c, 21d, and their ends are electrode terminals 2
It is fixed to 5a and 25b by soldering or welding. The thin film sheet 24a is provided on one side of the tip of the support plate
Is attached, the heat-sensitive portion 22 contacts the thin film sheet 24a,
Further, the thin film sheet 24b is attached so as to cover the support plate 20 and the heat sensitive portion 22. The tip of the support plate 20 and the heat sensitive portion 2
2 is sealed and fixed by the thin film sheets 24a and 24b. The thin film sheets 24a and 24b are thin film sheets made of polyimide resin or the like, and the thin film sheet 24a is a contact surface with a detection target. In particular, when the thin film sheet 24b is made of a material having a heat insulating property, it is possible to prevent the heat absorbed by the heat sensitive portion 22 from being dissipated and improve the thermal response of the temperature sensor. Of course, since the thin film sheet 24a is the contact surface with the object to be detected, a material having good thermal conductivity is used.

The thin film sheets 24a and 24b are used for the heat sensitive portion 2.
When sealing 2 the filler 27 is applied so as to surround the heat sensitive portion 22. The filler 27 has good thermal conductivity, and
A material such as silicon grease having a small heat capacity is used.
The filling material 27 does not always have to be filled, but by configuring the thin film sheet 24a and the filling material 27 so as to surround the heat sensitive portion 22, the heat flow due to the difference in heat capacity between the support plate 20 and the filling material 27. Are concentrated on the heat sensitive portion 22, heat absorption of the heat sensitive portion 22 is improved, and the thermal response of the temperature sensor can be improved.
The method of sealing and fixing the filling material 27 is not limited to the method using the thin film sheets 24a and 24b as described above, and the filling material may be sealed using a coating material made of a liquid resin such as a polyimide resin. .

On the other hand, the temperature sensor has a positional relationship with the object to be detected, and in particular, the contact angle between the heat-sensitive portion of the temperature sensor and the object to be detected affects the thermal responsiveness. A through hole 21a for mounting with a screw, a screw or the like that sets a positional relationship with the detected object, and a protrusion 21 for preventing rotation.
b and the concave portion 21e are provided. The protruding portion 21
Only one of b and the concave portion 21e may be formed. The through hole 21a formed in the holding body 21 is used as a screw hole for screwing, and the protruding portion 21b or the concave portion 21e is used.
Is used as a detent for the temperature sensor by engaging with a concave portion or a convex portion provided around the detected object. When mounting the temperature sensor on the object to be detected, a screw or screw is passed through the through hole 21a in a member around the rotary heating element while the heat sensitive part is in contact with the rotary heating element, and the protrusion 21b or the recess is formed. By engaging the portion 21e with a member around the detected object,
The heat-sensitive part of the temperature sensor is mounted correctly. Further, since the temperature sensor is fixed at two points, the heat-sensitive part is unlikely to be displaced during use.

Support plate 20 for the temperature sensor of the embodiment of FIG.
Is formed of a lead frame as shown in FIGS. The lead frame shown in FIG. 2 is formed by chemically etching or punching a strip-shaped metal plate such as stainless steel or Kovar nickel alloy. Guide holes 28 for sprockets are formed at regular intervals in a strip-shaped frame 29, narrow leads (electrode terminals) 25a, 25b extend in a direction perpendicular to the frame 29, and a pair of leads 25a, 25b are formed. It is connected to one side wall of the frame 29. A wide portion (support plate) 20 is formed at each tip of the lead 25b, and the opening 2 is formed at each tip.
6 is formed. Reference numeral 21 denotes a holder formed of an insulating resin, which is a part of the wide portion 20 and the leads 25a, 25.
A part of b is formed by transfer molding, 21a indicates a through hole, and 21b indicates a protrusion.

FIG. 3 shows another example of the lead frame, which is made of the same material and means as in FIG. Reference numerals 29a and 29b are strip-shaped frames, and guide holes 28 are formed at regular intervals in each frame. A pair of narrow leads (electrode terminals) 25a and 25b are formed on the side wall of the frame 29a to form the frame 2
It is connected to 9a. The wide portion (support plate) 20 is formed on the side wall of the frame 29b and the wide portion 2 is formed.
An opening 26 is formed at 0. The leads 25a and 25b of the frame 29a and the wide part 20 of the frame 29b are arranged so as to face each other, and the ends of the leads 25a and 25b and the wide part 20 are transfer-molded by an insulating resin to form a holding body 21. To be done.

The shape that gives the support plate the desired elasticity will be described below with reference to FIGS. In the lead frame shown in FIG. 4, the opening 2 is formed in the wide portion 20a of the support plate 20.
6 is formed, and the electrode terminal 25b is formed from the wide portion 20a.
The part up to is the narrow part that is cut out (narrow width part)
20b is formed, and the narrow portion 20b is connected to the frame 29 by being connected to a lead 25b having a narrower width which serves as an electrode terminal. Reference numeral 21 denotes a holder, and 24 denotes a thin film sheet. Although not shown, the wide portion 20a
You may make it provide a lead and it may be supported by another frame. In the lead frame of FIG. 5, notches 20c are provided on both sides of the wide support plate 20, and the notches 20c may be provided at a plurality of locations. The thin film sheet 24 has the cutout 20.
You may make it cover c with the thin film sheet 24. The lead frame shown in FIG. 6 has a shape in which a slit-shaped notch 20d is formed through a wide support plate 20 so as to penetrate the opening, and an opening 26a is opened. Although not shown, a slit-shaped notch may be formed in the support plate 20 so as not to penetrate the opening.

Of course, the support plate 20 is given elasticity by the shape shown in the above example, but the support plate 20 may be provided with a mesh to give elasticity, without being limited to this embodiment. Is clear. By forming the support plate 20 as shown in FIGS. 4 to 6, the tip end portion of the support plate 20 is given elasticity, and it is possible to prevent the heat-sensitive portion of the temperature sensor from being lifted up due to twisting. That is, the contact angle of the heat-sensitive part with the detected object becomes substantially zero, and the heat-sensitive part makes surface contact with the detected object, resulting in good thermal response.

The temperature sensor of the present invention will be described below in comparison with a conventional temperature sensor. FIG. 7A is a perspective view showing a state in which the temperature sensor is mounted on the detected object,
The heat-sensitive part of the temperature sensor A is attached in pressure contact with the surface of the heat fixing roller (heat generating rotating body) B of the detected object, and the heat fixing roller B having the heater C on its rotating shaft is rotating in the arrow direction. . FIG. 7B illustrates the mounting angle of the temperature sensor A. The heat-sensitive portion of the temperature sensor A intersects the rotation axis of the heat fixing roller B at a right angle and is pressed against the surface of the heat fixing roller B. The temperature deviation caused by the contact angle between the contact surface of the heat-sensitive part and the object to be detected due to the deviation of the mounting angle of the holder 21 is measured. FIG. 8 shows the measurement results due to the mounting angle deviation, in which the horizontal axis represents the mounting angle and the vertical axis represents the temperature deviation, and (a) shows the measurement result of the temperature sensor according to the present invention. (B) shows the measurement result of the conventional temperature sensor.

As is clear from the measurement results of FIG. 8, (a) shows the measurement results of the temperature sensor of the present invention, and even if the mounting angle of the temperature sensor is deviated, the temperature sensor is not It shows that the contact is good and that there is almost no temperature shift, and that the heat-sensitive part is in surface contact with the detected object. On the other hand, in the conventional temperature sensor, as is clear from the measurement result of (b), it is shown that the temperature deviation easily occurs as the mounting angle deviation of the temperature sensor increases. Indicates that there is floating and point contact occurs. That is, in the temperature sensor of the present invention, since the support plate has elasticity, even if the mounting angle of the holding portion of the temperature sensor deviates by ± 5 °, almost no temperature deviation occurs. The shape of the heat-sensitive part is such that it easily comes into surface contact with the object to be detected.

The temperature sensor of the present invention may have any structure as long as the heat-sensitive portion of the temperature sensor does not come into contact with the support plate, and the temperature sensor is not limited to one having an opening formed in the support plate and is not shown. It is obvious that the support plate may be provided with U-shaped recesses or groove-shaped recesses instead of the openings, and the heat-sensitive parts of the heat-sensitive element may be arranged in these recesses. that time,
It is advisable to provide a filler such as silicon grease having a high thermal conductivity and a small heat capacity in these recesses so that the heat-sensitive portion does not come into contact with the support plate, thereby enhancing the thermal response of the temperature sensor.

[0024]

As described above, according to the temperature sensor of the present invention,
Since the opening or recess formed in the wide part of the support plate is formed relatively large, even if the heat sensitive element is attached to the support plate, the heat sensitive part does not come into contact with the support plate, so it is absorbed by the heat sensitive part. There is an advantage that heat does not dissipate through the support plate having a large heat capacity and the thermal response becomes extremely good. Further, since the heat-sensitive part is surrounded by the filler having a small heat capacity and good thermal conductivity, the heat from the object to be detected is quickly and accurately absorbed from the entire heat-sensitive part of the heat-sensitive element through the filler and the heat-sensitive part Since the surface is in surface contact with the object to be detected, there is an advantage that the thermal response becomes remarkably excellent and the variation in thermal response can be reduced.

Further, according to the temperature sensor of the present invention, by disposing the heat-sensitive portion of the heat-sensitive element in the opening or recess formed in the support plate, the heat-sensitive portion of the heat-sensitive element can be removed when the temperature sensor is assembled. In addition to being able to be placed in an accurate position, the holding body is formed with a through hole for positioning and a protruding portion or a recessed portion, so using these, the temperature sensor can be fixed to the detected body at two points. By mounting, the heat-sensitive part can be fixed at an accurate position, and variations in thermal responsiveness or variations in detected temperature due to misalignment are less likely to occur, and the temperature can be accurately detected. is there.

Further, according to the temperature sensor of the present invention, the lead wire of the heat-sensitive element is joined to the electrode terminal projecting from the holder, so that the lateral variation of the elasticity of the support plate can be eliminated. At the same time, by forming notches or slit-like notches in the support plate, it is possible to give proper elasticity to the support plate, and to contact the detected object of the temperature sensor with an appropriate pressure contact force. Because you can
The temperature can be detected accurately. Further, according to the temperature sensor of the present invention, since the heat-sensitive portion is not in contact with the metallic support plate, even if the metal plate is thickened, the heat absorbed by the heat-sensitive portion is hard to dissipate and the thermal response In addition to the advantage that the elasticity is not deteriorated, the elasticity can be adjusted by adjusting the thickness of the metal plate.

Further, according to the temperature sensor of the present invention, heat dissipation can be prevented by using a material having an excellent heat insulating property for the thin film sheet on the opposite surface of the temperature sensor which is in contact with the object to be detected. There is an advantage that the influence on the element is small and the thermal response is good, and a temperature sensor having a high durability can be provided by sealingly fixing the heat sensitive portion with the thin film sheet. Further, since the temperature sensor of the present invention uses the lead frame and is configured to incorporate the heat sensitive element after resin molding, there is an advantage that the assembling work can be easily automated, and the quality is uniform. It is possible to provide a temperature sensor having a good thermal response.

[Brief description of drawings]

FIG. 1A is a plan view showing an embodiment of a temperature sensor of the present invention, and FIG. 1B is a sectional view taken along line XX ′ of the plan view.
(C) is a sectional view taken along the line YY 'of the plan view.

FIG. 2 is a plan view showing an example of a lead frame of the temperature sensor of the present invention.

FIG. 3 is a plan view showing another example of the lead frame of the temperature sensor of the present invention.

FIG. 4 is a plan view showing another example of the lead frame of the temperature sensor of the present invention.

FIG. 5 is a plan view showing another example of the lead frame of the temperature sensor of the present invention.

FIG. 6 is a plan view showing another example of the lead frame of the temperature sensor of the present invention.

FIG. 7A is a perspective view showing a state in which a temperature sensor is mounted on a detected body, and FIG. 7B is a view showing a mounting angle deviation of the temperature sensor.

FIG. 8 is a diagram showing a measurement result of a temperature shift with respect to a mounting angle shift of a temperature sensor.

9A is a perspective view showing a conventional temperature sensor, FIG.
(B) is a top view which shows the conventional temperature sensor, (c) is sectional drawing which shows the conventional temperature sensor.

[Explanation of symbols]

 20 Support plate 20a Wide part 20b Narrow part 20d Slit-shaped notch part 20c Notch part 21 Holding body 21a Through hole 21b Projection part 21c, 21d Insertion groove 21e Recessed part 22 Heat-sensitive part 22a, 22b Lead wire 23 Thermal element 24a Thin film sheet , 24b Thin film sheet 25 Electrode terminal 25a, 25b Lead (electrode terminal) 26, 26a Opening 27 Filler 28 Guide hole 29a, 29b Frame

Claims (6)

[Claims] 1. A heat-sensitive element having a heat-sensitive portion and a lead wire extending from the heat-sensitive portion, an elastic support plate having an opening or a recess larger than the heat-sensitive portion, and the lead wire. Electrode terminal, a supporting body in which the support plate and the electrode terminal are implanted, the heat-sensitive portion arranged in the opening or the recess, and the tip of the support plate, and the heat-sensitive portion. A temperature sensor, comprising: a thin film sheet whose contact surface with the object to be detected is a contact surface of the thin film sheet. 2. A heat sensitive element having a heat sensitive portion and a lead wire extending from the heat sensitive portion, an elastic support plate having an opening or a recess larger than the heat sensitive portion, and the lead wire are connected. Electrode terminal, a support plate on which the support plate and the electrode terminal are implanted, a first thin film sheet serving as a contact surface with a detection target on one surface of the support plate, and the opening or recess A temperature sensor, comprising: a filler surrounding the heat-sensitive part disposed on the first thin-film sheet; and a second thin-film sheet covering the support plate on which the heat-sensitive part is disposed with the first thin-film sheet. . 3. A heat-sensitive element having a heat-sensitive portion and a lead wire extending from the heat-sensitive portion, first and second electrode terminals to which the lead wire is connected, and a tip of the wide portion having a temperature higher than that of the heat-sensitive portion. A large-sized opening or recess is formed, and an elastic support plate in which the heat-sensitive element is arranged in the opening or recess; and a support plate and the first and second electrode terminals that are planted and held. A temperature sensor comprising: a body; and a thin film sheet that covers the heat-sensitive portion and the support plate, which are arranged in the opening or the recess. 4. A heat-sensitive element having a heat-sensitive portion and a lead wire extending from the heat-sensitive portion, first and second electrode terminals to which the lead wire is connected, and a thin electrode terminal. A support plate in which an opening or a recess larger than the heat-sensitive part is formed at the tip of a wide part extending from the width part; a holder in which the support plate and the first electrode terminal are implanted; A temperature sensor, comprising: a thin film sheet that covers the support plate and the heat-sensitive portion disposed in an opening or a recess. 5. The holding body is provided with a through hole and a recessed portion or a protruding portion, and an insertion groove for inserting the lead wire is provided. The temperature sensor described. 6. The temperature sensor according to claim 1, 2, 3 or 4, wherein a cutout portion or a slit-shaped cutout portion is provided in a wide portion of the support plate to give elasticity to the support plate. .