JPH0854292A - Temperature sensor and lead frame thereof - Google Patents

Abstract

PURPOSE:To provide a temperature sensor which can be arranged at a small gap without impairing heat response characteristics and has excellent mechanical strength. CONSTITUTION:Wide external lead terminals 3a', 3b' are formed at the ones of a pair of narrow-width metal plates 3a, 3b, and wide platelike holders 6a, 6b are formed at the others. A sheetlike temperature sensor has the electrode of a flat platelike thermosensitive element 7 adhered to the gap of the holders 6a, 6b by soldering, etc., and the parts of the terminals 3a', 3b' exposed and sealed at insulation sheets 9, 9'.

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 its lead frame, and more particularly to a surface of a battery during charging of a secondary battery such as a nickel-cadmium storage battery or a nickel-hydrogen storage battery used in home electric appliances. The present invention relates to a temperature sensor for detecting temperature and a lead frame suitable for the temperature sensor.

[0002]

2. Description of the Related Art A secondary battery may have a short battery life when it is charged when the temperature rises due to a chemical reaction or the like inside the battery during rapid charging or when the ambient temperature is low, or when the ambient temperature is high. As a method of solving the physical problem, it is necessary to detect and control the upper limit and the lower limit of the temperature that can be charged by the temperature sensor. The secondary battery generates electricity by generating electrons by a chemical reaction due to oxidation and reduction, and a structure that protects the temperature sensor from corrosion due to such oxidation and reduction is required, and
Batteries are required to be miniaturized, and it is necessary to meet the demands of temperature sensors.

Conventionally, a temperature sensor for detecting the surface temperature and the like of such a secondary battery is described in, for example, Japanese Utility Model Publication No. 5-17869 proposed by the present applicant as shown in FIG. There is a temperature sensor. In FIG. 4 (a),
Reference numeral 20 denotes a lead frame, which has a sprocket hole 21a.
A plurality of pairs of leads 22 and 22 'extending at right angles from the band-shaped portion 21 in which is formed are projected, and each lead is supported by a connecting portion (tie bar portion) 23, and leads 24 and 24' for sandwiching a chip component. Is extended. A pair of leads 2
The tip portions of 4, 24 'are tapered portions 25, 25' for narrowing the width thereof, and the clamping portions 26, 2 for clamping the chip component.
6'is formed.

FIG. 4B shows a state in which a chip component 27 composed of a heat sensitive element such as a thermistor is sandwiched by the sandwiching portions 26, 26 '. The chip component 27 is soldered to the gap between the sandwiching portions 26, 26 ', and has a structure in which the chip component and the sandwiching portion are insulated and coated so as to cover the periphery thereof. This type of temperature sensor is mounted in a battery pack and is often used as an element for detecting the surface temperature or the ambient temperature of a battery at the time of rapid charging and controlling the charging time.

[0005]

However, when the temperature sensor is arranged in the space inside the battery pack, the flat chip thermistor component is perpendicular to the gap between the holding portions 26, 26 'at the tip of the lead frame. Since the temperature sensor is sandwiched in the direction, the temperature sensor in the state of insulating coating has a drawback that the heat sensitive portion at the tip has a large shape, and there is a structural problem that the heat sensitive surface cannot be formed flat. Such a conventional temperature sensor tends to have insufficient contact with the battery in the battery case because the heat sensitive portion is not flat. Therefore, in such a temperature sensor, the contact between the temperature-sensing body and the heat-sensitive section is insufficient,
There is a drawback that the detected temperature varies and accurate temperature detection cannot be performed. Therefore, there is a drawback that such a temperature sensor cannot achieve a sufficient purpose for a temperature-detected body which requires a temperature sensor having higher detection accuracy and good thermal response characteristics. Furthermore, this temperature sensor
If the shape of the heat-sensitive part is large and the heat-sensitive part is mounted on a battery pack or the like, it will hinder the miniaturization of the battery pack. Further, when the temperature sensor is mounted, since the heat-sensitive surface is not flat, the temperature sensor may be twisted due to the twist of the heat-sensitive portion, and mechanical strength is required.

The present invention has been made in view of the above-mentioned problems, and it is small in size and can be disposed in a small gap in a battery pack without impairing thermal responsiveness, and has excellent mechanical strength. An object of the present invention is to provide a durable temperature sensor. Another object of the present invention is to provide a lead frame suitable for a temperature sensor.

[0007]

In order to achieve the above-mentioned object, the first temperature sensor of the present invention has a portion extending from one end of each of a pair of narrow metal plate portions as an external lead terminal, A sandwiching portion is formed at each of the other ends of the narrow metal plate portions, and an electrode portion formed on each side surface of the chip-shaped heat-sensitive element is connected to the side walls of the pair of sandwiching portions to connect the external lead terminals. It is characterized by being covered with an insulating sheet except for a part. In the second temperature sensor of the present invention, a wide external lead-out terminal is formed at a portion extending from one end of each of the pair of narrow metal plate portions, and a wide sandwich is provided at the other of the narrow metal plate portions. Parts are formed respectively, the electrode parts formed on the respective side surfaces of the chip-shaped heat-sensitive element are connected to the side walls of the pair of sandwiching parts, and a part of the external lead terminals is removed and covered with an insulating sheet. It is characterized by becoming. A first lead frame of a temperature sensor of the present invention includes a strip portion, a pair of parallel elongated metal plate lead portions extending in a direction perpendicular to the strip portion, and a tie bar portion supporting the elongated metal plate lead portion. A pair of narrow metal plate portions extending from the tie bar portion, and a tip end of each of the narrow metal plate portions is wider than the narrow metal plate portion,
In addition, the electrode part formed on the side surface of the chip component is provided with a sandwiching part connected to the side wall thereof. In a third temperature sensor of the present invention, a portion extending from one end of each of the pair of narrow metal plate portions is used as an external lead terminal,
A sandwiching portion having a width wider than the width of the narrow metal plate portion is formed at a portion protruding outward from each of the other ends of the narrow metal plate portion, and each of the chip-shaped heat sensitive elements is formed on a side wall of the sandwiching portion. The electrode parts are connected to each other, and a part of the external lead terminals is removed, and the external lead terminals are covered with an insulating sheet.

The second lead frame of the temperature sensor of the present invention supports the strip-shaped portion, a pair of parallel elongated metal plate-shaped lead portions extending in a direction perpendicular to the strip-shaped portion, and the elongated metal plate-shaped lead portion. The tie bar portion, the pair of narrow metal plate portions extending from the tie bar portion, and the portion protruding outward from the respective tip end portions of the narrow metal plate portion are wider than the width of the narrow metal plate portion, and It is characterized in that the electrode part on the side surface of the chip component is provided with a sandwiching part connected to the side wall thereof. In the temperature sensor, a cut is provided in at least one location of the insulating sheet. In the temperature sensor, an adhesive is attached to at least a part of the front and back of the insulating sheet in which the thermosensitive element is sealed. In the temperature sensor, as the insulating sheet, a polyimide resin sheet is used on one side and a polyester resin sheet or a Teflon resin sheet is used on the other side. In the temperature sensor, a cut portion is provided at at least one location of the insulating sheet, and an opening is provided at one end of the cut portion.

[0009]

In the first temperature sensor of the present invention, one of the pair of narrow metal plate portions is used as the external lead-out terminal, and the other of the narrow metal plate portions is used as the holding portion, and the pair of holding portions are provided. The electrode portions formed on the respective side surfaces of the chip-shaped heat-sensitive element are connected to the side walls of the heat-sensitive element, and the heat-sensitive surface of the heat-sensitive element becomes flat. In the second or third temperature sensor of the present invention, a wide sandwiching portion is provided at the tip of the narrow metal plate portion, and the electrode surface of the heat-sensitive element is electrically connected to the side wall of the sandwiching portion. The area of the heat-sensitive surface of the heat-sensitive element can be set large, and since the sandwiching portion has a large area, the heat absorption is good, the heat transfer to the heat-sensitive element is good, and the heat response characteristics are good. Further, the heat-sensitive element has a flat plate shape, a flat surface portion thereof is a heat-sensitive surface, an electrode is formed on the side wall thereof, and the side wall of the sandwiching portion is electrically connected to the electrode. Due to the flat shape, the degree of adhesion with the object to be detected becomes good, and the temperature can be accurately detected.

Further, since the metal portion of the temperature sensor can be integrally formed by the lead frame, variations in shape or dimensional accuracy can be reduced, and the lead sheet can be attached to the insulating sheet. Since they can be assembled, the number of assembly parts and the number of assembly steps can be reduced, and automation is easy. Further, since the first and second temperature sensors of the present invention are formed in a thin sheet shape, it is not necessary to provide a special space for disposing the temperature sensor inside a case such as a battery pack. Further, in the second temperature sensor of the present invention, by widening the gap between the narrow metal plate portions in the portion reaching the pair of sandwiching portions of the heat-sensitive portion, the sandwiching portion can be prevented from an electrical short circuit by soldering or the like. There is. The temperature sensor uses a polyimide resin sheet as a heat-resistant resin sheet as an insulating sheet, and uses a polyethylene resin sheet or a Teflon resin sheet to increase mechanical strength, and a temperature sensor having increased heat resistance and tear strength. It is a thing.

[0011]

Embodiments of the temperature sensor and its lead frame of the present invention will be described below with reference to the drawings. FIG.
1A is a plan view showing a lead frame of an embodiment of the temperature sensor according to the present invention, FIG. 1B is a perspective view of the temperature sensor, and FIG. 1C is FIG. 1B. It is sectional drawing which followed the XX line of FIG. FIG. 1D is a sectional view of another embodiment. First, a lead frame used for the temperature sensor will be described with reference to FIG. A is a lead frame formed by chemically etching or pressing a strip-shaped metal plate of stainless steel, kovar, nickel or nickel alloy. External lead-out terminals 3a ', 3b' extend at right angles to the belt-like portion 2 through a very narrow portion in the belt-like portion 2 in which the sprocket holes 1 are formed at regular intervals, and further, the external lead-out terminal 3a '. , 3b ', the elongated metal plate-shaped lead portions 3a, 3b are connected. As described above, the strip-shaped portion 2 is provided with a plurality of sets each including the parallel elongated metal plate-shaped lead portions 3a and 3b.

Narrow metal plate portions 5a and 5b extend in the extending portions of the elongated metal plate-shaped lead portions 3a and 3b, and the pair of elongated metal plate-shaped lead portions 3a and 3b and the narrow metal sheet. Board 5
A tie bar portion 4 for fixing and holding these is formed in the intermediate portion between a and 5b. At the tips of the narrow metal plate portions 5a and 5b, a flat plate-shaped holding portion 6 that protrudes outward and has a wide width is provided.
a and 6b are formed. Tapered portions 8a and 8b are formed at the tips of the sandwiching portions 6a and 6b, respectively. The taper portions 8a and 8b prevent short-circuiting due to bridging (solder bridge) due to solder between the sandwiching portions 6a and 6b when the heat-sensitive element is bonded by solder, and the gaps between the sandwiching portions 6a and 6b. When the width is large, it is not always necessary to form the tapered portions 8a and 8b. Further, not only can a solder bridge be prevented from causing a short circuit, but also an acute angle portion formed by the tapered portions 8a and 8b and the electrode surface of the heat sensitive element can be used as a reservoir for the solder, so that the appearance shape can be improved. In addition to being good, the thermosensitive element can be firmly adhered to the sandwiching portions 6a and 6b, so that the mechanical strength can be increased.

Next, the temperature sensor of the embodiment will be described with reference to the perspective view of FIG. 1 (b) and the sectional view of FIG. 1 (c). In FIG. 1 (b), wide flat plate-shaped holding portions 6a, 6b
To the thin elongated metal plate leads 3a and 3b and to the external lead-out terminals 3a 'and 3b'. The side surfaces of the thermosensitive element 7 such as a thermistor are attached to the side walls of the plate-like holding portions 6a and 6b. The electrode portions formed on are contacted and connected by solder. Insulation sheet 9,9 'such as polyimide resin
Is coated with an adhesive agent on at least one side thereof, so that the elongated metal plate-shaped lead portions 3a and 3b, the heat-sensitive element 7 and the holding portion 6a,
6b and external lead-out terminals 3a ', 3b' except for a part thereof are attached so as to sandwich the thermosensitive element 7. By forming the width W of the flat plate-shaped holding portions 6a and 6b wide, the insulating sheets 9 and 9'are firmly adhered to the surfaces, so that the mechanical strength can be increased. Further, the heat sensitive element 7 is
Since it is a flat plate-shaped chip component, as shown in FIG. 1C, the heat sensitive element 7 adhered to the side surfaces of the sandwiching portions 6a and 6b.
Has a slight gap, and since the surfaces of the insulating sheets 9 and 9'can be made substantially flat, a small gap is sufficient for the portion where the temperature sensor is mounted. Also, FIG. 1 (d)
As shown in FIG. 7, one surface of the sandwiching portions 6a and 6b, that is, the surface of the thermosensitive element 7 that is in contact with the temperature detection target is flush with each other. The heat-sensitive element 7 has solder 15a, 15 on the side walls of the sandwiching portions 6a, 6b.
The temperature is accurately detected by sufficiently fixing the main heat-sensitive surface of the heat-sensitive element 7 to the object to be detected.

The method of assembling the temperature sensor of this embodiment will be briefly described. The claw of the automatic feeding device engages with the sprocket hole 1 of the lead frame 2 and is fed. A certain heat-sensitive element 7 has a holding part 6
The thermosensitive element 7 is inserted into the gap between a and 6b from the side of the taper portions 8a and 8b, and is clamped and fixed to the clamping portions 6a and 6b by the elasticity of the lead frame. The heat sensitive element 7 and the sandwiching portions 6a and 6b are soldered and fixed to the solder bath. After that, the tie bar portion 4 is cut and removed. Then, the lead frame A to which the heat sensitive element 7 is soldered
Goes to the insulating sheet covering step, and the external lead terminals 3a ′,
The heat sensitive element 7 is covered by pressure bonding so as to sandwich the insulating sheets 8 and 8'on both sides of the lead frame A while leaving a part of 3b '. Furthermore, in the cutting process, the external lead terminal 3
The temperature sensors are separated from each other by cutting in the vicinity of the ends of a'and 3b 'and cutting the insulating sheet individually.

Needless to say, the chip-shaped heat-sensitive element may be inserted into the gap between the holding portions 6a and 6b from the direction perpendicular to the surfaces of the holding portions 6a and 6b by an automatic component inserting machine. At that time, it is preferable to insert the holding portions 6a and 6b in a state in which they are slightly opened. In addition, the tie bar portion 4 holds the holding portions 6a, 6a.
When it is provided at a position away from b, the tie bar portion 4 may be cut off after covering the heat sensitive element with the insulating sheet. As described above, since the temperature sensor can be assembled using the lead frame, it is advantageous for automation, the assembling accuracy can be improved, and the number of assembling parts and the number of assembling steps can be reduced. Further, the thickness of the thermosensitive element 7 such as a thermistor is ideally set to be approximately the same as the thickness of the lead frame so as not to project in the thickness direction of the plate of the lead frame A. However, in the embodiment, the thickness of the flat chip component is thicker than the thickness of the plate of the lead frame A, and the shape is slightly projected. Further, the heat sensitive element 7 may be a thin film thermistor or the like, and may be a temperature sensor whose structural dimensions, characteristics, etc. are sufficiently satisfied, and is not limited to the embodiment.

Next, another embodiment of the temperature sensor of the present invention and its lead frame will be described. FIG. 2A is a plan view of the lead frame, and FIG. 2B is a plan view of the main part thereof. In FIG. 2A, the lead frame B
Is a pair of elongated metal plate-shaped lead portions 3a, which are parallel to each other at right angles from a strip-shaped portion 2 in which sprocket holes 1 are arranged at equal intervals.
A large number of pairs of 3b are projected, and thin metal plate portions 5a and 5b are formed on the extending portions thereof, and are fixedly held by the tie bar portion 4. The narrow metal plate portions 5a and 5b have tip portions that are slightly overhanging outward, and have wide sandwiching portions 6a and 6b.
Are formed. A void 14 is formed in a portion reaching the sandwiching portions 6a and 6b. A taper portion 8 is provided on the sandwiching portions 6a and 6b.
a, 8b and 8c, 8d are formed. Clamping part 6a,
By forming a wide void 14 in a portion reaching 6b, a lead having a structure that prevents solder bridging even when a chip component having a small distance between the electrodes 10a and 10b of the heat sensitive element 7 such as a chip component is used. It is a frame. That is, the electrodes 10a, 10b formed on the side surface of the heat sensitive element 7
The lengths of the side walls of the sandwiching portions 6a and 6b at the portions in contact with the electrodes 10a and 10b are set to be shorter than the length of the electrodes, and the solder bridge is apt to be formed between the sandwiching portions 6a and 6b during soldering. A short circuit can be prevented.

FIG. 2 (b) is an enlarged view of the heat-sensitive portion of the temperature sensor, in which 11 is a plan view of the insulating sheet (shown by the dotted line), and portion 13 shown by the dotted line is the insulating sheet 11.
The adhesive part 13 is provided on the surface of the adhesive, and the adhesive part 13 is for positioning when the temperature sensor is attached to the temperature detection target. Further, the insulating sheet 11 has concave cutouts 12, 1
2'is provided. In this way, the notches 12, 12 '
Is provided to reduce the stress applied to the sandwiching portions 6a and 6b due to the twist of the heat sensitive portion or the like. The cut portion is not limited to the recessed cut portions 12 and 12 ', but the cut portion is provided in the insulating sheet 11 between the narrow metal plate portions 5a and 5b, so that the heat-sensitive portion is twisted or the like so as to sandwich the cut portion. The structure is such that the stress applied to 6a and 6b is reduced. Further, the adhesive portion 13 is not limited to the portion shown in FIG. 2 (b), and may be any portion as long as the heat-sensitive portion of the temperature sensor can be fixed to the detection portion of the temperature detection target. Obviously, these are also applicable to the embodiment of FIG. Also, the concave notch 1
The positions at which 2, 12 'are formed are not limited to the embodiment, and may be different depending on the object to be mounted, and may be set in consideration of the portion where twist occurs. Further, in this embodiment, the assembling method of the embodiment of FIG. 1 can be applied, the assembling dimensional accuracy is good, and the number of assembling parts and the assembling man-hour can be reduced.

In the above embodiment, the elongated metal plate lead portions 3a and 3b to which the heat sensitive element 7 is fixed are connected to the insulating sheets 9 and 9 '.
Is coated with. The insulating sheets 9 and 9'may be made of polyimide resin on both sides. However, in order to obtain an insulating sheet having high heat resistance and high mechanical strength, a polyimide resin sheet is used for the contact portion with the heat-sensitive surface of the temperature sensing object, and a polyester resin sheet or Teflon resin sheet is used for the other. . This combination of resin sheets takes advantage of the fact that polyester resin sheets and Teflon resin sheets are more stretchable than polyimide resin sheets. It can be attached while maintaining good adhesion to the shape. 1 (d), the insulating sheet 9 on the side to be detected is a heat-resistant polyimide resin sheet, and the insulating sheet 9'on the side having a step in the thickness direction due to the lead frame is It is preferable to use a polyester resin sheet or a Teflon resin sheet.

Further, FIG. 3 is a diagram showing a main part of another embodiment of the temperature sensor according to the present invention, and this embodiment can be applied to the embodiments of FIGS. 1 and 2. In FIG. 3, the insulating sheets 9 and 9'are the elongated metal plate-shaped lead portions 3
The notch 16 is formed in the insulating sheet on the side where a and 3b project. A circular opening 17 is provided at the tip of the cut portion 16. The tear strength of the insulating sheet can be improved by forming the continuous circular opening 17 in the cut portion 16. That is, even if the insulating sheets 9 and 9'are pulled by the elongated metal plate-shaped lead portions 3a and 3b, the insulating sheets 9 and 9'are easily absorbed by the cut portion 16 and the opening 17 at the tip thereof. It can prevent tearing. The mechanical strength can be further enhanced by providing the notch 16 and the opening 17 at the tip thereof while the mechanical strength is enhanced by the polyimide resin sheet and the polyester resin sheet or the Teflon resin sheet.

As described above, the temperature sensor of the present invention can have a sheet-like shape and a flat heat-sensitive surface. Even when the thickness of the heat sensitive element is thicker than the thickness of the lead frame (about 150 μm),
As shown in (c) and (d), the heat-sensitive element may be formed in a sheet shape although it slightly protrudes. Further, in the temperature sensor of the present invention, the heat-sensitive element is fixedly supported by the thin metal lead and is covered with the insulating sheet, and the heat-sensitive portion has elasticity, and by covering with the insulating sheet, the chemical reaction It can be protected from corrosion due to, for example, the mechanical strength can be enhanced by pressing two insulating sheets together. The insulating sheet preferably has heat resistance and acid resistance, as long as it can withstand the characteristics of the temperature-sensing body to be mounted.

In the embodiment shown in FIG. 1, the shape covered with an insulating sheet is as shown in the embodiment shown in FIGS.
It is also possible to provide a cut portion partially. With respect to these shapes, a temperature sensor having the most suitable shape may be selected according to the object to be detected. Obviously, the heat sensitive element may be a thin film thermistor, a semiconductor element, or the like. Further, it is advantageous to provide the tie bar portion of the lead frame above as in the embodiment so as to give elasticity to the holding portion, but it is not always necessary to be above due to the thickness of the lead frame. When the tie bar portion is provided below, the tie bar portion and the lead portion can be cut at the same time, and the remaining portion of the narrow metal plate portion (lead portion) can be used as the external output terminal. Further, the taper portion of the sandwiching portion does not need to be linear as in the embodiment.

[0022]

As described above, the temperature sensor and the lead frame thereof according to the present invention include a pair of parallel narrow metal plate lead portions extending in a right angle direction from the strip portion and a pair of narrow metal plate lead leads. A tie bar portion formed on the upper part of the tie bar portion, a narrow metal plate portion further extending from the tie bar portion, and a wide sandwiching portion protruding to the outside of the pair of narrow metal plate portions formed at the tip portion thereof. Is ideally designed to have a thickness approximately the same as the thickness of the lead frame, but it may be a little thicker than that, and is a flat plate-shaped chip component with electrodes on its side surface. Sandwiching them between the sandwiching parts and joining them with solder, etc., and sandwiching the sandwiching parts and a part of the narrow metal plate-shaped lead part with an insulating sheet for insulation coating, and finally, for the insulating sheet and the narrow metal of the lead frame. Cut the plate-shaped leads individually And to form individual temperature sensors. Therefore, not only the workability is remarkably improved as compared with the conventional forming processing for each individual product, but also the processing accuracy of the lead frame is high, so that the occurrence rate of defective products due to dimensional variation can be reduced.

Further, since it is a flat plate-shaped temperature sensor, it can be mounted in a small gap without providing a special space, and when the heat-sensitive part is mounted on the object to be detected, the heat-sensitive part comes into close contact with the object to be detected. Moreover, since the heat-sensitive surface is wide, there is an advantage that the temperature can be accurately detected. Further, by using the wide sandwiching portion, the heat absorbed by the sandwiching portion is easily conducted to the heat sensitive element through the side surface thereof, the heat response characteristic is improved, and accurate temperature detection is possible. Furthermore, if these temperature sensors are assembled with a lead frame, the thermosensitive element can be accurately positioned and joined and fixed without using a special jig or the like. Finally, by cutting the strip-shaped portion and the insulating sheet, a large number of temperature sensors can be continuously manufactured, and the workability is remarkably improved as compared with the conventional single-piece processing. In addition, these series of assembly work,
Since it is performed in the state of the lead frame, and finally, the narrow metal plate-shaped lead portion is cut and separated, there is an advantage that the assembly process can be easily automated.

Further, the electrode surface formed on the side surface of the heat sensitive element is joined to the side surface of the wide sandwiching portion by soldering or the like. Since this part is put into the solder bath, the sandwiching part is formed with a gap wider than that of the narrow metal plate part so that the sandwiching parts can prevent a short circuit by the solder bridge, and the solder adhesion is prevented. It is reduced and the assembly workability is good. or,
By properly forming the cut portion in the insulating sheet, abnormal stress is not given even if twisting occurs when it is attached to the temperature sensing object, so mechanical strength and durability are improved. There is an advantage that can be. Further, by providing the adhesive portion on the insulating sheet, there is an advantage that the temperature sensor can be easily positioned by attaching the temperature sensor to the mounting position of the temperature sensing object. Also, a heat-resistant insulating sheet such as a polyimide resin sheet and a resin sheet such as Teflon or polyester having high tensile strength are attached to the insulating sheet,
It is possible to prevent damage due to tearing of the insulating sheet. Further, by providing a cutout portion and a circular opening portion at the tip of the insulating sheet, there is an advantage that the mechanical strength can be increased even if the insulating sheet is laminated with a heat resistant insulating sheet such as a polyimide resin sheet.

[Brief description of drawings]

1A is a plan view showing an embodiment of a lead frame of a temperature sensor according to the present invention, FIG. 1B is a perspective view showing an embodiment of a temperature sensor according to the present invention, and FIG. -A sectional view taken along the line X, and (d) is a sectional view of another embodiment.

FIG. 2A is a plan view showing an embodiment of a lead frame of a temperature sensor according to the present invention, and FIG. 2B is a plan view showing a main part of the temperature sensor according to the present invention.

FIG. 3 is a plan view showing a main part of another embodiment of the temperature sensor according to the present invention.

FIG. 4A is a plan view showing an example of a lead frame of a conventional temperature sensor, and FIG. 4B is a plan view showing a main part thereof.

[Explanation of symbols]

 A, B lead frame 1 sprocket hole 2 strips 3a, 3b elongated metal plate-shaped leads 3a ', 3b' external lead-out terminals 4 tie bar parts 5a, 5b narrow metal plate 6a, 6b sandwiching part 7 thermal element 8a- 8d Tapered part 9,9 'Thin film sheet 10a, 10b Electrode 12, 12' Notch part 13 Adhesive part 14 Void 15a, 15b Solder 16 Notch part 17 Opening part

Claims (9)

[Claims] 1. A pair of narrow metal plate portions, each of which extends from one end of the pair of narrow metal plate portions, is used as an external lead terminal, and a sandwiching portion is formed at each of the other ends of the narrow metal plate portions. A temperature sensor characterized in that an electrode portion formed on each side surface of a chip-shaped heat-sensitive element is connected to the side wall of the above, and a part of the external lead terminal is removed and covered with an insulating sheet. 2. A wide outer lead-out terminal is formed at a portion extending from one end of each of the pair of narrow metal plate portions, and a wide sandwiching portion is formed at each other end of the narrow metal plate portions. An electrode portion formed on each side surface of the chip-shaped heat-sensitive element is connected to the side walls of the pair of sandwiching portions, and a part of the external lead terminal is removed, and an insulating sheet is coated. And a temperature sensor. 3. A strip-shaped portion, a pair of parallel elongated metal plate-shaped lead portions extending in a direction perpendicular to the strip-shaped portion, a tie bar portion supporting the elongated metal plate-shaped lead portion, and a pair of extended tie bar portions. A narrow metal plate portion and an electrode portion, which is wider than the narrow metal plate portion and is formed on a side surface of the chip component, is connected to a side wall of each of the tip portions of the narrow metal plate portion. A lead frame comprising a holding portion. 4. A portion of the pair of narrow metal plate portions extending from one end of each of the narrow metal plate portions is used as an external lead-out terminal, and a portion of the narrow metal plate portion protruding outward from the other end of the narrow metal plate portion is formed. A sandwiching portion that is wider than the width of the plate portion is formed, and each electrode portion of the chip-shaped heat-sensitive element is connected to the side wall of the sandwiching portion, and a part of the external lead terminal is removed and covered with an insulating sheet. A temperature sensor characterized by the following. 5. A strip-shaped portion, a pair of parallel elongated metal plate-shaped lead portions extending in a direction perpendicular to the strip-shaped portion, a tie bar portion supporting the elongated metal plate-shaped lead portion, and a pair of tie bar portions extending from the tie bar portion. The narrow metal plate portion and the portions protruding outward from the respective tip end portions of the narrow metal plate portion are wider than the narrow metal plate portion, and the electrode portions on the side surfaces of the chip component are provided on the side walls thereof. A lead frame comprising: a sandwiching part to be connected. 6. The temperature sensor according to claim 1, wherein a cut is provided in at least one location of the insulating sheet. 7. The temperature sensor according to claim 1, wherein an adhesive is attached to at least a part of the front and back of the insulating sheet encapsulating the thermosensitive element. 8. The insulating sheet, wherein a polyimide resin sheet is used on one side and a polyester resin sheet or a Teflon resin sheet is used on the other side.
The temperature sensor according to 4, 6, or 7. 9. A cut portion is provided at at least one location of the insulating sheet, and an opening portion is provided at one end of the cut portion, 1, 2, 4, 6, 7 or 8.
The temperature sensor described in.