JP3434010B2 - Temperature sensor - Google Patents

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art Conventionally, as an example of this type of temperature sensor, there is a temperature sensor disclosed in Japanese Utility Model Laid-Open No. 4-81023. 9A is a plan view of this temperature sensor, and FIG. 9B is a sectional view taken along the line AA. Figure 9
In (a), the heat sensitive element 23 is arranged in the gap between the pair of metal plates 21a and 21b, and the electrodes of the heat sensitive element 23 are electrically connected to the pair of metal plates 21a and 21b, respectively.
As shown in FIG. 9B, the thin film sheet 22 that comes into contact with the temperature sensing object is attached to one surface of the metal plates 21a and 21b,
The thermosensitive element 23 is placed on the thin film sheet 22 in the gap, surrounded by the filling material 26, and sealed and fixed by the covering sheet 27. Both ends of the metal plates 21a and 21b are holders 2
4, 25, and the terminals 2 from the holders 24 and 25, respectively.
1 is protruding. The holders 24 and 25 are provided with through holes 24a, 24b and 25a for mounting, respectively. As shown in FIG. 10, this temperature sensor is used in such a manner that the heat-sensitive surface of the temperature sensor is brought into contact with the temperature detection target 30 such as a rotating roller with the thin film sheet 22 surface thereof.
The heat of 0 is absorbed from the entire surface of the heat sensitive element 23 through the contact sheet 22 and the filler 26, and the heat response characteristic is excellent.

Further, the heat sensitive element 23 is attached to the metal plates 21a and 21b.
Does not come into direct contact with each other, the heat does not escape from the heat-sensitive element 23 even if the metal plates 21a and 21b are thickened, and the contact force to be brought into contact with the temperature detection target is reduced without decreasing the thermal response characteristics thereof. It can be adjusted by the sheath elastic force. Moreover, since a proper contact force can be obtained, a durable temperature sensor can be obtained. Further, since the surface of the temperature sensor opposite to the surface in contact with the temperature detection target is arranged to cover the heat-sensitive element 23 which is adiabatically covered with the filler 26, the heat generated by the convection in the surroundings Since there is no escape, the influence on the heat sensitive element 23 can be reduced. From this point as well, this temperature sensor can have excellent thermal response characteristics and be stable.

[0004]

However, since the temperature sensor described above has a structure in which the heat-sensitive element is sealed by the covering sheet on the surface opposite to the thin film sheet on the temperature detection surface of the metal plate, the temperature sensor is actually manufactured. In the temperature sensor thus formed, a protrusion formed by the spherical head of the heat sensitive element is formed on the thin film sheet side of the temperature detection surface. Therefore, if a temperature sensor with a protrusion is used by pressing it against the surface of the heat fixing roller, the temperature sensor may be damaged if the surface of the roller is scratched, shortening the life of the roller, or if the scratch becomes large. There is a drawback that it becomes difficult to make close contact with the roller surface and accurate temperature detection cannot be performed. Further, when it is used in a fixing device such as a copying machine, there is a defect that the toner enters into the scratches on the roller surface, and the thin film sheet is worn and damaged by the toner to destroy the heat sensitive element.

In addition, this temperature sensor has a sealing structure including a cover sheet provided for the purpose of preventing the influence of the temperature of the surrounding atmosphere and a thin film sheet on the contact surface between the temperature sensing object, but the cover sheet. Due to the small thickness of the rotor, there is a drawback that the fluctuation of the control temperature cannot be completely eliminated due to the influence of convection due to heat generated near the rotor and its surface.

The present invention has been made in view of the above-mentioned problems, and achieves stable thermal response characteristics without impairing the thermal response characteristics, and has excellent mechanical strength and durability. An object is to provide a temperature sensor.

[0007]

In order to achieve the above-mentioned object, the first temperature sensor of the present invention is provided so as to close the opening or notch formed in the elastic metal plate. The heat-sensitive element is sandwiched between the surface of the elastic body opposite to the surface in contact with the metal plate and a thin film sheet having at least heat resistance characteristics, and the heat- sensitive element is fitted into the elastic body to form the thin film sheet.
Of the surface on the side opposite to the surface in contact with the thermal element
The present invention is characterized in that the surface of the thin film sheet is used as a contact surface with the temperature sensing object so that the projection is eliminated .

[0008] The second temperature sensor of the present invention, the outer Bu引
A pair that are spaced apart from each other and that extend from the terminal part that connects the outgoing line
Of the narrow metal plate part and the tips of the pair of narrow metal plate parts.
Cutouts formed and elasticity provided so as to close the cutouts
Opposite the body and the surface of the elastic body that contacts the narrow metal plate portion
A heat-sensitive element placed substantially in the center of the surface, and the pair of narrow metal
A terminal to which the base plate and its extension, which is an external lead wire, are connected
The heat-sensitive element including a holding body that fixes the portion and the elastic body.
And a thin film sheet sandwiching the
Insert into elastic body and contact with the heat sensitive element of the thin film sheet
The surface on the side opposite to the surface on which the protrusion
The lead wire of the thermosensitive element to the terminal portion or narrow metal.
Connected to the plate part, the surface of the thin film sheet as a temperature sensing object
Is a contact surface of the. The third temperature sensor of the present invention is the second temperature sensor according to
The holding body is provided with a through hole for attachment and a protrusion or a recess for positioning.

The fourth temperature sensor of the present invention is an elongated metal.
An opening or a notch is provided at the tip of the base plate to form the opening.
The notch or notch with an elastic body and
Place the thermosensitive element on the surface opposite to the surface that contacts the elongated metal plate,
The heat sensitive element is sandwiched between the elastic body and the thin film sheet,
When the thermal element is fitted into the elastic body and is in front of the thin film sheet.
There is no protrusion on the surface opposite to the surface in contact with the thermal element.
The elongated metal plate portion to the extension portion
Fix the external lead wire to which the lead wire of the thermosensitive element is connected
A tongue and a positioning hole or notch are provided .

Further, the fifth temperature sensor of the present invention has elasticity.
An elongated metal plate portion having and formed at one end of the elongated metal plate portion
The opening or notch and the opening or notch
An elastic body provided so as to be closed, and the elongated metal of the elastic body
A heat-sensitive element mounted on approximately the center of the surface opposite to the surface in contact with the plate
And a thin film sheet sandwiching the heat-sensitive element with the elastic body
The heat-sensitive element is fitted into the elastic body, and
On the side opposite to the surface of the thin film sheet in contact with the heat sensitive element
The elongated metal plate portion is configured so that there is no protrusion on the surface.
At the other end of the, also serves as a protrusion that protrudes toward the heat-sensitive surface, and for mounting
Along with the positioning holes or notches, the heat-sensitive element
And a tongue for fixing the external lead wire to which the lead wire is connected.
, The surface of the thin film sheet as a contact surface with the temperature sensing object
It is characterized by doing. The sixth temperature sensor of the present invention is the temperature sensor according to any one of the first to fifth aspects , wherein the elastic body is sponge or rubber.

[0011]

The first temperature sensor uses a narrow metal plate portion having elasticity, and a heat sensitive element is provided on the narrow metal plate portion via an elastic body (sponge or the like), so that the temperature sensitive surface of the temperature sensor can be improved. Since it can reduce the pressure contact force when it is pressed against the temperature-sensing body, it prevents the thermosensitive element from protruding to the temperature-sensing body side. It is possible to reduce the pressure contact force of the spherical head of the element with the surface of the body to be detected . Further, by providing a large opening to the narrow metal plate portion of the rear surface side corresponding to the heat sensitive element of the elastic body mounted with the heat sensitive element, at the time of press-contact heat-sensitive part of the temperature sensor in the temperature detection member surface, It is possible to reduce the pressure contact force of the spherical head of the heat-sensitive element against the surface of the temperature-sensing body. In addition, by providing the narrow metal plate with the opening or the notch, it is possible to prevent the heat sensitive element from being affected when the narrow metal plate is heated.

The second temperature sensor uses a narrow width metal plate portion having elasticity, and a heat sensitive element is provided on the narrow width metal plate portion via an elastic body (sponge or the like) so that the temperature sensing surface of the temperature sensor is improved. It is possible to reduce the pressure contact force when it comes into pressure contact with the temperature sensing object, and by providing a large opening in the narrow metal plate on the back side corresponding to the heat sensitive element of the elastic body on which the heat sensitive element is mounted, When the heat-sensitive part of the temperature sensor is pressed against the surface of the detection body, the pressure contact force of the spherical head of the heat-sensitive element against the surface of the temperature-detected body can be reduced. In addition, the opening or notch formed in the narrow metal plate portion can prevent the heat sensitive element from being affected when the narrow metal plate portion is heated. The third temperature sensor facilitates positioning of the temperature sensor in addition to the functions of the first to third temperature sensors.

In addition to the functions of the first and second temperature sensors, the fourth temperature sensor uses not only a metal plate as an elastic body but also positioning holes, notches, and lead wires of the heat-sensitive element. Since the fixed part of the external lead wire to be connected is formed,
It is possible to reduce variations in size and the like, reduce the number of parts to be assembled and the number of assembling steps, and reduce disconnection of lead wires of the heat-sensitive element during assembly. The fifth temperature sensor, in addition to the effect of the fourth temperature sensor, a convex portion adjacent to the mounting hole is formed in the elongated metal plate by removing the holding member, from being lifted from a screwed portion by the mounting hole Since this can be prevented, the variation in the pressing force of the heat fixing roller to the roller surface for each temperature sensor is reduced. The sixth temperature sensor provides elasticity by using sponge or rubber as the holder.

[0014]

Embodiments of the temperature sensor of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a temperature sensor according to the present invention. In the figure, reference numeral 1 denotes a heat sensitive element such as a bead thermistor from which two lead wires 2a and 2b are drawn out, and a pair of narrow metal plate portions 3a and 3b.
A substantially U-shaped cutout portion 4 is formed at the tip of b in a continuous state, and the other end is planted in a holding body 5 so that an external lead wire 12 is formed.
a, 12b. Narrow metal plate parts 3a, 3b
The thin film sheet 10a is adhered to the back surface of the tip of the sheet, and the thin film sheet 10b is provided with the box-shaped protrusion 10c on the front surface.
Are bonded to the tip portions of the narrow metal plate portions 3a and 3b so as to sandwich the thermosensitive element 1. Inside the box-shaped protrusion 10c, a sponge 11 is housed as shown by providing a notch in the box-shaped protrusion 10c, and the thermosensitive element 1 is formed by the box-shaped protrusion 10c and an elastic body 11 such as a sponge. It is sandwiched.
The lead wires 2a and 2b of the heat sensitive element 1 are connected to the external lead wires 12a and 12b through the grooves 9a and 9b formed in the holding body 5 and are protected by the insulating coating tubes 13a and 13b. The holding body 5 is provided with a through hole or a screw hole 6, and the protruding portion of the holding body 5 is provided with a projecting portion 7 and a concave portion 8. Of course, either the protrusion 7 or the recess 8 may be formed, and the present invention is not limited to the embodiment. Further, the thermosensitive element 1 is not limited to the bead thermistor, and a thermocouple, a platinum resistor, a thin film thermistor, or the like can be used. The thin film sheet 10b is, but not limited to, a resin sheet having a thickness of 100 to 200μ.

Next, a detailed description will be given with reference to FIGS. 2 (a) and 2 (b). FIG. 2A shows a lead wire 2 of the thermosensitive element 1.
FIG. 3 is a plan view showing more clearly the wiring of a and 2b and the shapes of the narrow metal plate portions 3a and 3b, and the thermosensitive element 1 corresponds to the U-shaped cutout portion 4 of the narrow metal plate portions 3a and 3b. The lead wires 2a and 2b are connected to the external lead wires 12a and 12b through the grooves 9a and 9b, respectively. Needless to say, the lead wires 2a and 2b may be fixed to the tip end portions of the narrow metal plate portions 3a and 3b by soldering or the narrow metal plate portions 3a and 3b in the box-shaped protrusion 10c. Good. Figure 2
2B is a cross-sectional view taken along the line YY of FIG. 2A, in which the thermosensitive element 1 has an elastic body 11 such as a sponge housed in a box-shaped protrusion 10c provided on the resin sheet 10b. The thermosensitive element 1 is pressed inside the box-shaped protrusion 10c to set its position. The elastic body 11 such as sponge has only to have elasticity, and flexible rubber may be used. The surface of the box-shaped protruding portion 10c indicated by the arrow A is the surface that comes into contact with the temperature detection target.

FIG. 3 is a plan view of the lead frame of the embodiment shown in FIG. 1. This lead frame is made of a material such as stainless steel, kovar, or nickel alloy, and is formed by a known method such as chemical etching or pressing. It is formed. Sprocket holes 15 are formed in the strip-shaped portion 14 of the lead frame at regular intervals, and a pair of terminal portions 3a ', 3b' extend from the strip-shaped portion 14 to form narrow metal plate portions 3a, 3b.
The U-shaped notch 4 is formed by connecting to b and forming symmetrical notches at their tips. Such a narrow metal portion 3a extending from the pair of terminal portions 3a ', 3b',
A plurality of strips 3b are formed on the strip portion 14. It is obvious that the U-shaped notch 4 is not limited to this shape and may be a circle or an ellipse.

Next, the assembling process will be briefly described with reference to FIGS. The holding frame 5 is formed by resin molding the lead frame shown in FIG. 3 with a material such as insulating plastic by means of transfer molding or the like. From the holder 5, the narrow metal plate portions 3a and 3b and the terminal portions 3a 'and 3b' are projected. Then, the narrow metal plate portions 3a, 3b
The elastic body 11 is arranged so as to close the notch 4 at the tip of the thermosensitive element 1, and the thermosensitive element 1 is placed on the substantially central portion of the surface opposite to the surface of the elastic body 11 in contact with the narrow metal plate portions 3a and 3b. Then, the lead wires 2a and 2b of the heat sensitive element 1 are connected to the narrow metal plate portions 3a and 3b.
And is connected to the terminal portions 3a 'and 3b' through the grooves 9a and 9b of the holding body 5. Lead wires 2a, 2b
Is a narrow metal plate portion 3a, 3b if it is sufficiently thin.
Even when it comes into direct contact with, there is no difference in the temperature detection capability due to poor contact on the heat-sensitive surface due to variation in the pressure contact force when pressure-contacted to the temperature detection target such as the rotating body. A thick lead wire is not preferable because variations in the pressure contact force occur, but there is no problem even if the portion wired to the holding body 5 is thick.
Then, the thin film sheet 10b is formed so as to cover the surface of the elastic body 11 arranged so as to close the notch 4 on the side of the heat sensitive element 1.
Affix. Thin film sheet 10b and narrow metal plate portions 3a, 3
The heat sensitive element 1 and the elastic body 11 are sandwiched by b.

The thin film sheet need only have an elastic body adhered and fixed to the metal plate portion, and it is not always necessary to have a structure in which the two thin film sheets shown in FIG. 1 are bonded together. It may be attached only to the contact surface. However, when the metal surfaces of the narrow metal plate portions 3a, 3b are required to have electrical insulation or mechanical strength, thin film sheets may be attached to both sides. Further, the thin film sheets 10a and 10b are required to have heat resistance characteristics such as a polyimide film. Further, when the temperature detection target is a rotating body or the like, a thin film having abrasion resistance in addition to heat resistance characteristics. Use as a sheet. After that, the terminal part 3 of the lead frame
The a ′ and 3b ′ are cut from the strip portion 14. Terminal portions 3a 'and 3b' are projected from the holding body 5, and
External lead wires 12a and 12b are connected to a'and 3b 'with solder or the like, and covered with coating tubes 13a and 13b to form a temperature sensor.

When this temperature sensor is attached to a heat fixing roller of a fixing device, for example, a protrusion 7 or a recess 8 provided in a holder 5 is fitted into a hole or a protrusion formed in a temperature sensor attachment portion of the device. Then, the screws are fixed by screwing with the screw holes 6, and the surface of the box-shaped protrusion 10c formed on the thin film sheet 10b of the temperature sensor opposite to the contact surface with the thermosensitive element 1 is brought into contact with the temperature sensing object. In the embodiment, the thin metal sheets 10b and 10a are made up of the narrow metal plate portions 3a and 3b and the elastic body 1.
1 and the heat-sensitive element 1 are fixed so as to sandwich them, but it is clear that only the thin film sheet 10b may be provided, and the thin film sheet may be bent to form a space without necessarily forming the box-shaped protrusion 10b. It is obvious that the heat sensitive element and the elastic body may be sandwiched between the heat sensitive element and the elastic body. Further, the holding body 5 is not limited to the embodiment, and a frame-shaped body molded in advance with resin may be used.

Next, another embodiment of the temperature sensor according to the present invention will be described with reference to FIGS. FIG. 4 is a perspective view of the temperature sensor. In the figure, reference numeral 16 is an elongated metal plate portion, an opening portion 17 is provided at the tip end portion thereof, and a convex portion 16a provided for bending reinforcement at the other end portion thereof, and close to the convex portion 16a. A mounting hole 16b and a recessed notch 16c for positioning are formed. As shown in FIG. 6, these are formed of a lead frame composed of an elongated metal plate portion 16 connected to an extremely small portion 20 extending from a strip portion 14 in which sprocket holes 15 are formed at regular intervals. An elastic body 11 such as a sponge is provided in the opening 17 provided at the tip of the elongated metal plate portion 16 so as to cover the opening 17, and the thermosensitive element 1 is placed at substantially the center of the elastic body 11. The thermosensitive element 1 is sandwiched between the bent thin film sheet 18 and the elastic body 11. Thin film sheet 1
8 is adhered to the elongated metal plate portion 16. The lead wires 2a and 2b of the thermosensitive element 1 are connected to the external lead wires 12a and 12b. The external leads 12a and 12b are fixed to the elongated metal plate portion 16 by crimping the tongue portion 19 provided on the end edge of the elongated metal plate portion 16.

Next, regarding the process of assembling the temperature sensor, a plan view of the temperature sensor of FIG. 5A, a cross-sectional view of FIG. 5B along the line YY and a lead frame of FIG. 6 are shown. Description will be given with reference to a plan view. First, as shown in FIG.
The elongated metal plate portion 16 having the shape described above for the lead frame
Are formed by a pressing process or the like. The lead frame is made of the same material as that of the embodiment shown in FIG. After that, as shown in FIG.
As shown in (b), the elastic body 11 such as sponge or rubber is closed in the opening 17 provided at the tip of the elongated metal plate portion 16, and the thermosensitive element 1 is placed on the substantially central portion of the elastic body 11. , The elastic body 11 is housed in the bent thin film sheet 18,
In addition, the thin film sheet 18 is bonded to the elongated metal plate portion 16 so that the heat sensitive element 1 is sandwiched between the thin film sheet 18 and the elastic body 11. The lead wires 2a and 2b are also bonded and fixed by the thin film sheet 18. After that, the lead wires 2a and 2b are connected to the external lead wires 12a and 12b, the connecting portion is covered with an insulating tube or the like, and the insulating tube is caulked with the tongue portion 19 to fix the lead wires 2a and 2b. . Then, the temperature sensor is formed by separating the elongated metal plate portion 16 of the lead frame from the fine details 20.

As with the embodiment of FIG. 1, the thin film sheet 18 has at least heat resistance and is made of a wear-resistant polyimide resin or the like. The thin film sheet 18 is bent, and the thin film sheet surface 18a is a bonding portion with the elongated metal plate portion 16.
Reference numeral b denotes a contact surface with the temperature detection object, and the bent thin film sheet surface 18c is bonded to the back surface of the elongated metal plate portion 16. Further, it is preferable that the bent portion of the thin film sheet 18 is not bent at a right angle but is curved so that the temperature-detected body is not easily scratched. Of course, this thin film sheet 1
As shown in FIG. 1, 8 may be formed by laminating two thin film sheets, or may be formed only on the contact surface of the temperature-detecting body. Alternatively, as in the embodiment of FIG. 1, a box-shaped protrusion may be formed to accommodate the elastic body 11. Of course, if mechanical strength is required, it is advisable to use two thin film sheets. Furthermore, the shape of the opening 17 is not limited to the embodiment shown in FIG. 4, and may be a circular opening or a U-shaped cutout. Further, the elastic body 11
Is not limited to sponge, and may be elastic rubber.

In this temperature sensor, the surface opposite to the surface of the thin film sheet 18 in contact with the heat sensitive element 1 is the contact surface with the temperature sensing object. The thin film sheet 18 presses the heat sensitive element 1 lightly,
Since the thermosensitive element 1 is fitted into the elastic body 11 made of sponge, rubber or the like, the thin film sheet 18 does not project from the thermosensitive element 1 toward the temperature sensing object side, and the temperature sensing object is not damaged. Further, the convex portion 16 provided on the elongated metal plate portion 16
Although a is for maintaining the strength, when the mounting hole 16b is attached to the device with a screw, the convex portion 16a provided in the vicinity of the mounting hole 16b comes into contact with the device, and the elongated metal plate portion 16 The elasticity is used to strengthen the screwing and the elongated metal plate portion 16 is slightly bent, so that the heat-sensitive portion can be prevented from rising from the body to be temperature-sensed. Therefore, it is possible to reduce variations in the pressure contact force of the heat fixing roller with the roller surface for each temperature sensor.

In the above embodiment, the thin film sheet for sandwiching the heat sensitive element is preliminarily formed into a box-shaped protruding portion, or the thin film sheet is bent. It is not necessary to be limited to using such thin film sheets. That is, the elastic body 11 is placed on the metal plate portion 16 'as shown in the sectional view of FIG. 7 (a) so as to close the opening 17', and the heat sensitive element 1 is placed on the substantially central portion thereof. The thin film sheet 18 'that has not been processed is attached to the thermosensitive element 1
The structure may be covered with. Further, as shown in the sectional view of FIG. 7 (b), the elastic body 11 is placed on the metal plate portion 16 'so as to close the opening 17', and the thermosensitive element 1 is placed on the substantially central portion thereof. Alternatively, the thin film sheet 18 ′ may be attached to the elastic body 11 so as to cover the thermosensitive element 1. Furthermore, FIG.
As shown in the sectional view of (c), when the elastic body 11 is very thin, the contact surface with the non-temperature detecting body becomes substantially flat. In any case, the structure is not limited to each embodiment as long as at least the thin film sheet is arranged on the surface of the elastic body that comes into contact with the surface of the temperature detection target. By forming the heat-sensitive portion of the temperature sensor into such a shape, the thin film sheet does not damage the surface of the temperature detection target.

Next, in order to investigate the thermal response characteristic of the temperature sensor of the above-mentioned embodiment, the overshoot characteristic and ripple shown in FIG. 8 were measured. The smaller the overshoot To, the shorter the time required to reach the set temperature, and the ripple T
It can be said that the smaller r is, the better the control characteristic at the set temperature is and the more excellent the thermal response characteristic is. The measurement of the thermal response characteristics of the temperature sensor of the above-mentioned example was carried out under the measurement condition that the surface temperature of the heating roller was set to 180 ° C. as a result,
In the temperature sensor of the above example, the overshoot To was 4.0 ° C and the ripple Tr was 3.5 ° C. On the other hand, the present applicant previously proposed the actual Kaihei 4-810.
In the temperature sensor disclosed in Japanese Patent Publication No. 23, the overshoot To was 7.0 ° C. and the ripple Tr was 5.5 ° C. under the same measurement conditions. From this measurement result, it became clear that the temperature sensor of the present invention exhibits excellent characteristics.

[0026]

As described above, the temperature sensor of the present invention is
The heat-sensitive element has a shape sandwiched between an elastic body such as a sponge and a thin film sheet, and when the heat-sensitive portion is pressed against the surface of the temperature detection target, the head of the heat-sensitive element fits into the elastic body. There is an advantage that the heat-sensitive element of the heat-sensitive element, which is often present in the conventional contact-type temperature sensor, does not damage the surface of the temperature-sensitive body due to the local pressure protruding from the thin film sheet. Further, there is an advantage that the thin film sheet itself is less likely to be damaged by the protrusion of the heat-sensitive head of the heat-sensitive element. Further, by forming an opening or a notch at the tip of the narrow metal plate portion, the pressure contact force of the heat-sensitive surface can be further reduced, so that the heat-sensitive surface of the temperature sensor and the surface of the temperature sensing object are It has the advantage of being effective in protection. Further, since the thermosensitive element is covered with an elastic body such as sponge, it is possible to prevent the ripple temperature from fluctuating due to thermal convection during actual operation of the heat fixing device.

Further, according to the temperature sensor of the present invention, the tongue portion provided on the elongated metal plate portion is used to crimp the external lead wire to which the lead wire is connected, so that the elongated sensor can be formed without forming a holding member such as resin. Since it can be formed integrally with the metal plate portion, there is an advantage that the structure can be simplified and the manufacturing cost can be reduced. Also, by using the notch and the mounting hole, it is easy to position the temperature sensor, and the elasticity of the elongated metal plate and the convex portion provided on the elongated metal plate strengthen the screw stop, Since the lifting of the stopping portion can be prevented, there is an advantage that the heat-sensitive portion of the temperature sensor can be accurately brought into contact with the temperature detection target, and there is an advantage that the temperature detection accuracy can be improved. In addition, since these temperature sensors can be subjected to a series of assembling steps in the state of the lead frame, there is little variation in shape, and the holding body can be integrally molded in the state of the lead frame when resin-molded. At the same time, the number of assembling parts and the number of assembling steps are reduced, and there is an advantage that the assembling process can be easily automated. Further, there is an advantage that it is possible to reduce disconnection of the lead wire of the heat sensitive element in the assembly process.

[Brief description of drawings]

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

2A is a plan view of a temperature sensor according to the present invention, FIG.
(B) is sectional drawing which followed the YY line of a top view.

3 is a plan view of a lead frame used in the embodiment of FIG. 1. FIG.

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

5A is a plan view of the embodiment of FIG. 4, and FIG. 5B is a cross-sectional view taken along the line YY.

6 is a plan view of a lead frame used in the temperature sensor of FIG.

FIG. 7 is a sectional view of a heat-sensitive portion of the temperature sensor.

FIG. 8 is an explanatory diagram showing an overshoot characteristic and a ripple characteristic of a temperature sensor.

FIG. 9A is a plan view showing an example of a conventional temperature sensor, and FIG. 9B is a sectional view taken along the line AA.

FIG. 10 is a diagram showing a mounting example of a conventional temperature sensor.

[Explanation of symbols]

1 Thermal element 2a, 2b lead wire 3a, 3b elongated metal plate part 4 U-shaped notch 5 holder 6 screw holes 7 Projection 8 recess 9a, 9b groove 10a, 10b thin film sheet 11 elastic body 12a, 12b External output line 16 Slender metal plate 16a convex part 16b mounting hole 16c Notch 17 openings 18 Thin film sheet 19 tongue

Front page continuation (58) Fields surveyed (Int.Cl. ⁷ , DB name) G01K 7/22

Claims (6)

(57) [Claims] 1. A temperature sensor comprising a heat-sensitive element on an elastic metal plate, wherein an opening or notch formed in the elastic metal plate.
The surface of the elastic body provided so as to close the metal plate in contact with the metal plate
The heat-sensitive element is sandwiched between the opposite surface of the heat-sensitive element and a thin film sheet having at least heat resistance, and the heat- sensitive element is fitted into the elastic body.
The surface of the thin film sheet in contact with the heat-sensitive element
A temperature sensor characterized in that the surface of the thin film sheet is configured so as not to project on the opposite side, and the surface of the thin film sheet serves as a contact surface with the temperature sensing object. Wherein Mashimasu extending from the terminal portion for connecting the external lead wire
A pair of narrow metal plate portions spaced apart from each other, a notch formed at the tip of the pair of narrow metal plate portions, an elastic body provided so as to close the notch, and the thin body of the elastic body. Width Abbreviation of the surface opposite to the surface in contact with the metal plate
A heat-sensitive element placed in the center, the pair of narrow metal plate portions, and an external lead wire which is an extended portion thereof.
A holding body for fixing the terminal portion to which is connected, and a thin film sheet for sandwiching the thermosensitive element with the elastic body.
The heat-sensitive element is fitted into the elastic body,
The protrusion on the surface opposite to the surface in contact with the heat-sensitive element
The lead wire of the thermosensitive element is configured to be eliminated, and the terminal portion or the narrow metal plate portion is formed.
And contact the surface of the thin film sheet with the temperature sensing object.
A temperature sensor having a touch surface. 3. The holding body is provided with a through hole for attachment.
And provided with a protrusion or a recess for positioning
The temperature sensor according to claim 2, wherein: 4. An opening or notch is provided at the tip of the elongated metal plate.
When a portion is provided and the opening or notch is closed with an elastic body,
The opposite surface of the elastic body that is in contact with the elongated metal plate portion
The heat sensitive element is placed on the thin film, and the heat sensitive element is attached to the elastic body and the thin film.
It is sandwiched with a sheet, and the heat-sensitive element is fitted into the elastic body.
The thermosensitive element and contact touch to that surface of the thin film sheet Te anti
The elongated metal is configured so that there is no protrusion on the opposite surface.
The lead wire of the heat-sensitive element is connected to the extending portion of the base plate portion.
Tongue for fixing external leader and positioning hole or notch
A temperature sensor having a section. 5. An elongated metal plate portion having elasticity and an opening or notch formed at one end of the elongated metal plate portion.
And an elastic body provided so as to close the opening or the notch
And a substantially opposite surface of the elastic body that is in contact with the elongated metal plate portion.
A heat-sensitive element placed in the center, and a thin film sheet sandwiching the heat-sensitive element with the elastic body.
The heat-sensitive element is fitted into the elastic body,
The protrusion on the surface opposite to the surface in contact with the heat-sensitive element
Configured to eliminate, to the other end of the elongate metal plate portion, a convex portion projecting heat-sensing surface side
And a hole or notch for positioning as well as for mounting
And an external lead wire to which the lead wire of the thermal element is connected.
A tongue for fixing the surface of the thin film sheet to temperature.
A temperature sensor having a contact surface with a detection body. 6. The elastic body is sponge or rubber.
6. The method according to any one of claims 1 to 5, characterized in that
The temperature sensor described.