JP6836669B2 - Surge-resistant winding low-temperature fuse resistor and its manufacturing method - Google Patents

Description

The present disclosure relates to a fuse resistor and a method for manufacturing the same, and more specifically, a surge-resistant winding low-temperature fuse resistor and a method for manufacturing the same.

When the circuit is working properly, the fuse resistor acts as a fixed resistor. When the operating current exceeds the rated current, it blows like a fuse due to overheating to protect the circuit. Generally, the fusing temperature of a winding fuse resistor is the melting point of the winding. However, considering the resistance value and other electrical characteristics, the winding material of the conventional fuse resistor is mainly made of a high melting point alloy. The fusing temperature is too high and there is a reddening process, which can burn or destroy circuits and other components, affecting the circuit protection effect.

One aspect of the present disclosure is to provide a surge-resistant winding low temperature fuse resistor.

Embodiments of the present disclosure provide an insulating rod, a first winding, second winding, and a fuse resistor comprising a connection. The insulating rod has a first end and a second end. In the first winding, the insulating rod is wound from the first end of the insulating rod. The second winding winds the insulating rod from the second end of the insulating rod. The connection portion is disposed between the first windings and the second windings, the melting point of the connecting portion is lower than the melting point of the first winding and a second winding, the first winding and the second winding is are separated from each other, it is electrically connected via the connection portion.

According to some embodiments of the present disclosure, the fuse resistor further comprises a first insulating layer covering the first and second windings, the first insulating layer exposing a portion of the insulating rod. Has an opening.

According to some embodiments of the present disclosure, the material of the first insulating layer includes an epoxy resin, a silicone nonflammable paint, or an enamel paint.

According to some embodiments of the present disclosure, the openings include slot openings that surround and partially expose the insulating rod.

According to some embodiments of the present disclosure, the openings include dot openings to partially expose the insulating rod.

According to some embodiments of the present disclosure, the connection portion through the aperture in the first insulating layer, in contact with the first winding and the second winding.

According to some embodiments of the present disclosure, the first insulating layer and the second insulating layer covering the connection portion are provided, and the opening of the first insulating layer is filled.

According to some embodiments of the present disclosure, the material of the second insulating layer includes an epoxy resin, a silicone nonflammable paint, or an enamel paint.

According to some embodiments of the present disclosure, the fuse resistor further comprises a first cap and a second cap, the first cap being electrically welded from one end of the insulating rod to one end of the first winding. The second cap is electrically welded from the second end of the insulating rod to one end of the second winding.

According to some embodiments of the present disclosure, the fuse resistor has a first electrical cover layer that electrically connects one end of the first winding to the first cap and one end of the second winding to the second cap. It further includes a second electrical cover layer to be connected.

According to some embodiments of the present disclosure, the material of the first electric cover layer and the second electric cover layer includes tin, copper, iron, silver, nickel, or alloys thereof, respectively.

According to some embodiments of the present disclosure, the thickness of the first and second electrical cover layers is between 1 and 20 micrometers, respectively.

Another embodiment of the present disclosure provides a method of manufacturing one fuse resistor, the manufacturing method providing an insulating rod, winding a winding around the insulating rod, cutting the winding and separating them from each other. Including forming the first winding and the second winding, forming the connection part , and electrically connecting the first winding to the second winding, the melting point of the connection part is the first winding. And lower than the melting point of the second winding.

According to some embodiments of the present disclosure, the method of manufacturing a fuse resistor is to form a first insulating layer on an insulating rod and winding before cutting the winding, and an opening in the first insulating layer. Further includes forming and cutting the winding.

According to some embodiments of the present disclosure, the openings include slot openings that surround and partially expose the insulating rod.

According to some embodiments of the present disclosure, the openings include dot openings to partially expose the insulating rod.

According to some embodiments of the present disclosure, the method of manufacturing a fuse resistor is to form a second insulating layer , cover the first insulating layer and the connection portion , and fill the opening of the first insulating layer. Including further.

According to some embodiments of the present disclosure, the method of manufacturing a fuse resistor is to form a first cap on the first end of the insulating rod and a second cap on the second end of the insulating rod. Further includes forming.

According to some embodiments of the present disclosure, the method of manufacturing a fuse resistor is to electroweld one end of the winding to the first cap and the other end of the winding to the second cap. Including further.

According to some embodiments of the present disclosure, the method of manufacturing a fuse resistor is to use a first electrical cover layer to electrically connect one end of the first winding to a first cap, and a second electrical. It further comprises using a cover layer to electrically connect one end of the second winding to the second cap.

According to some embodiments of the present disclosure, the first electric cover layer, the second electrical cover layer, and the connecting portion is formed with the same process.

For the best understanding, it is recommended that you read this disclosure with reference to the accompanying drawings and their detailed textual description. In order to comply with industry standards, the drawings in this patent specification are not necessarily drawn to the correct scale. In some drawings, the dimensions may be intentionally enlarged or reduced to make the content easier for the reader to understand.

FIG. 1 shows a fuse resistor according to an embodiment of the present disclosure.

FIG. 2 is a schematic view showing a method of manufacturing a fuse resistor according to the embodiment of the present disclosure. FIG. 3 is a schematic view showing a method of manufacturing a fuse resistor according to the embodiment of the present disclosure. FIG. 4 is a schematic view showing a method of manufacturing a fuse resistor according to the embodiment of the present disclosure. FIG. 5 is a schematic view showing a method of manufacturing a fuse resistor according to the embodiment of the present disclosure.

FIG. 6 shows a fuse resistor according to another embodiment of the present disclosure.

FIG. 7 is a schematic view showing a method of manufacturing a fuse resistor according to another embodiment of the present disclosure. FIG. 8 is a schematic view showing a method of manufacturing a fuse resistor according to another embodiment of the present disclosure. FIG. 9 is a schematic view showing a method of manufacturing a fuse resistor according to another embodiment of the present disclosure.

The present disclosure provides many different embodiments or examples to implement the various features of the present disclosure. For the sake of brevity, the present disclosure also describes examples of specific components and arrangements. These examples are provided for demonstration purposes only and are not intended to be limited. For example, a method in which the first feature is above or above the second feature in the description below may include certain embodiments in which the first feature is in direct contact with the second feature, or the first feature and the first feature. (Ii) Different embodiments may be included in which other features are formed between the first and second features so that the features do not come into direct contact. In addition, various examples of the present disclosure use repeating reference numbers and / or text annotations for the purpose of simplifying and clarifying the document, and these repeating reference numbers and annotations are in different embodiments. And does not specify the relationship between configurations.

Further, in the present disclosure, the spatially relative terms "below", "below", "lower", "above", etc. "Upper", "on", etc. refer to one element or feature and another singular or multiple element or feature, as shown in the figure, for simplicity of explanation. Describe the relative relationship. In addition to the angular orientations shown in the figure, these spatially relative terms are also used to describe the possible angles and orientations of the device in use or in operation. The orientation of the angle of the device is subject to change (90 degrees or other directions), and the spatially relative description used in this disclosure can be interpreted as well.

See FIG. FIG. 1 is a diagram showing a fuse resistor according to an embodiment of the present disclosure. As shown in FIG. 1, the fuse resistor 1 of the present embodiment includes an insulating rod 10, a first winding 22, a second winding 24, and a connecting portion 26. The insulated wire 10 has a first end portion 101 and a second end portion 102. The insulating rod 10 of the present embodiment may include a ceramic rod, but the material thereof is not limited to the ceramic material, and any insulating material such as glass fiber capable of achieving the object of the present disclosure can be used. In addition, the insulating rod 10 of the present embodiment has a cylindrical shape, but is not limited thereto.

The first winding 22 is wound around the insulating rod 10 from the first end 101, and the second winding 24 is wound around the insulating rod 10 from the second end 102, and the first winding 22 and the second winding 22 are wound. The windings 24 are not directly connected and have a gap between them. In some embodiments, the first winding 22 and the second winding 24 are spirally wound around the insulating rod 10. In some embodiments, the first winding 22 and the second winding 24 are spirally wound around the insulating rod 10. In some embodiments, the gap between the first winding 22 and the second winding 24 is between about 0.05 mm (mm) and about 2 mm. The connecting portion 26 is arranged between the first winding 22 and the second winding 24, and the length of the connecting portion 26 is set to connect the first winding 22 and the second winding 24. It may be slightly larger than the gap between the first winding 22 and the second winding 24. The melting point of the connecting portion 26 is lower than the melting points of the first winding 22 and the second winding 24, and the first winding 22 and the second winding 24 are separated from each other and electrically connected via the connecting portion 26. To.

In the present embodiment, the materials of the first winding 22 and the second winding 24 include or can be selected from materials having a melting point higher than that of the connection portion 26. For example, the melting point of the first winding 22 and second winding 24 is approximately is between 800 degrees Celsius 1500 degrees, the melting point of the connecting portion 26, less than about less than 500 degrees Celsius, or about Celsius 300 degrees obtain. It is between, but not limited to, about 200 degrees Celsius to 300 degrees Celsius. First winding 22, the material of the second winding 24 and the connecting portion 26 may be determined according to electrical specifications and safety specifications of the resistor. In some embodiments, the materials of the first winding 22 and the second winding 24 may include, or are selected from, nickel-copper alloys, or other suitable refractory conductive metals, or alloy materials. obtain. Further, the material of the connecting portion 26, tin, copper or other low melting conductive metal or may comprise an alloy material, or may be selected from them. With the above configuration, when the operating current of the fuse resistor 2 of the present embodiment exceeds the rated current, the low melting point connection portion 26 has a low fusing temperature and a high fusing speed. Therefore, in order to protect the circuit, first It is blown. It is also noteworthy that in normal operation, the operating temperature of the fuse resistor 1 is less than about 70 degrees Celsius, so that the connecting portion 26 having a low melting point does not affect the normal operation of the fuse resistor 1.

In some embodiments, the fuse resistor 1 may further include a first insulating layer 12 covering the first winding 22 and the second winding 24. The first insulating layer 12 has an opening 12S that exposes a part of the insulating rod 10. In some embodiments, the material of the first insulating layer 12 includes or can be selected from insulating paints such as epoxy resins, or other insulating materials. In some embodiments, the connecting portion 26 is in contact with the first wire 22 and second wire 24 through the opening 12S of the first insulating layer 12. In some embodiments, the opening 12S of the first insulating layer 12 may include a slot opening that surrounds the insulating rod 10 and partially exposes the insulating rod 10. In some embodiments, the width of the slot opening of the first insulating layer 12 is between, but is not limited to, about 0.05 mm to about 2 mm.

In some embodiments, the fuse resistor 1 may further include a second insulating layer 14 that covers the first insulating layer 12 and the connecting layer 26 and fills the opening 12S of the first insulating layer 12. In some embodiments, the material of the second insulating layer 14 includes or can be selected from insulating paints such as epoxy resins, silicone nonflammable paints, enamel paints, or other insulating materials.

In some embodiments, the fuse resistor 1 may further include a first cap 32 and a second cap 34. The first cap 32 covers the first end 101 of the insulating rod 10 and is electrically connected to the first winding 22, and the second cap 34 covers the second end 102 of the insulating rod 10 and the second winding. It is electrically connected to 24. In some embodiments, the material of the first cap 32 and the second cap 34 can include iron, steel, aluminum, copper, other metals, alloys, or graphite materials. In some embodiments, one end of the first winding 22 may be welded first to the first cap 32 and one end of the second winding 24 may be welded first to the second cap 34. In some embodiments, the fuse resistor 1 has a first electrical cover layer 361 that electrically connects one end of the first winding 22 to the first cap 32 and one end of the second winding 24 to the second cap 34. It can further include a second electrical cover layer 362 that is electrically connected. In some embodiments, the materials of the first electrical cover layer 361 and the second electrical cover layer 362 may include, but are not limited to, tin, copper, iron, silver, nickel, or other alloys. In some embodiments, the first electrical cover layer 361 and the second electrical cover layer 362 can, but are not limited to, be formed by electroplating. In some embodiments, the first electric cover layer 361, the second electric cover layer 362 and the connecting portion 26, in order to simplify the manufacturing steps can be produced by the same process. In some embodiments, the thickness of the first electrical cover layer 361 and the second electrical cover layer 362 is between, but is not limited to, about 1 micrometer and about 20 micrometers, respectively. In the surge shock state, about 90% or more of the breakage of the conventional winding resistor occurs at the welding point between the winding and the cap, and an open circuit failure occurs. Therefore, the first electric cover layer 361 and the second electric cover layer 362 can be used to reinforce the welded portions of the first winding 22 and the second winding 24, respectively, and increase the hardness of the welded portions, resulting in poor production. Reduce the rate and further improve the reliability of the weld point. The welding strength of the first winding 22 and the second winding 24 is ensured by the first electric cover layer 361 and the second electric cover layer 362, and the surge resistance (anti-surge) effect of the fuse resistor 1 can be enhanced. it can.

In some embodiments, the fuse resistor 1 extends outward from the first cap 32 with a first wire 42 electrically connected to the first cap 32 and outwards from the second cap 34 and extends outward from the second cap 34. A second wire 44, which is electrically connected to the wire 44, can be further included. The first wire 42 and the second wire 44 can be electrically connected to an external circuit such as a printed circuit board.

See Table 1. Table 1 lists the results of the fuse resistor blowing test in the comparative example and the embodiment of the present disclosure.

In the fuse resistance test of Table 1, the resistance value specifications of the fuse resistor of the comparative example and the fuse resistor of the embodiment of the present disclosure are both 1Ω, and the power specification is 2 watts (W). Fuse Resistor first winding and the second winding of the comparative example is directly connected, the first winding and the second winding of the fuse resistors in the embodiments of the present disclosure is electrically connected through a low melting point connecting portion Will be done. For example, the material of the connection part is tin may be formed by electroplating. As shown in Table 1, the error of the resistance value of the fuse resistor of the comparative example and the fuse resistor of the embodiment of the present disclosure are both within the allowable error range (± 5%), and the fusing power is increased by 40 times. In the set state, the fuse resistor according to the present disclosure has a lower blow time and a blow temperature than the fuse resistor of the comparative example, and the fuse resistor according to the present disclosure has a protective effect on the circuit. Prove to raise the target.

See FIGS. 2, 3, 4, and 5. 2 to 5 are schematic views showing a method of manufacturing a fuse resistor according to the embodiment of the present disclosure. As shown in FIG. 2, the insulating rod 10 is provided. The insulating rod 10 has a first end portion 101 and a second end portion 102. Subsequently, the winding 21 is wound around the insulating rod 10. In some embodiments, the first cap 32 and the second cap 34 may be formed on both sides of the insulating rod 10, but on the outside of the first cap 32 and the second cap 34, the first wire 42 and the second, respectively. The wire 44 can be formed outward. In some embodiments, both ends of the winding 21 can be welded to the first cap 32 and the second cap 34 by electrical welding, respectively. For example, first one end of the winding 21 is electrically welded to the first cap 32, then the winding 21 is wound around the insulating rod 10, and then the other end of the winding 21 is electrically welded to the second cap 34. be able to.

As shown in FIG. 3, the first insulating layer 12 is formed on the insulating rod 10 and the winding 21. Next, as shown in FIG. 4, an opening 12S is formed in the first insulating layer 12, and the winding 21 is cut to form the first winding 22 and the second winding 24 separated from each other. In some embodiments, the opening 12S of the first insulating layer 12 is a slot opening that surrounds the insulating rod 10 and partially exposes the insulating rod 10. In some embodiments, the formation of the slot opening of the first insulating layer 12 and the formation of the cut of the winding 21 can be performed simultaneously. In some embodiments, forming the slot opening of the first insulating layer 12 and cutting the winding 21 can be performed using a cutting tool, but is not limited thereto. As shown in FIG. 5, a connecting portion 26 for electrically connecting the first winding 22 and the second winding 24 is formed. In some embodiments, the connection portion 26, electroplating, may be formed by dipping the tin bath or other suitable processes. In some embodiments, the first electrical cover layer 361 is provided to enhance the strength of the weld points of the first winding 22 and the first cap 32, and the weld points of the second winding 24 and the second cap 34. Use to electrically connect one end of the first winding 22 to the first cap 32 (eg electroplating) and use the second electrical cover layer 362 to attach one end of the second winding 24 to the second cap. An electrical connection (eg, electroplating) can be made to 34, increasing the reliability of the weld point. As shown in FIG. 1, the second insulating layer 14 is then formed so as to cover the first insulating layer 12 and the connecting portion 26, and the opening 12S of the first insulating layer 12 is filled with the embodiment of the present disclosure. Fuse resistor 1 is manufactured.

The fuse resistors of the present disclosure are not limited to the above embodiments and may have other different embodiments. In order to simplify the description and facilitate comparison between the embodiments of the present disclosure, the same components of the following embodiments are numbered the same. In order to more easily compare the differences between embodiments, the following description details the differences between different embodiments and does not repeat the same features and related details.

See FIG. FIG. 6 is a schematic diagram showing a fuse resistor according to another embodiment of the present disclosure. As shown in FIG. 6, unlike the fuse resistor 1 of FIG. 1, the opening 12S of the first insulating layer 12 of the fuse resistor 2 of the present embodiment has a dot opening that partially exposes the insulating rod 10. Including. In some embodiments, the shape of the dot openings can include any regular or irregular geometry. In some embodiments, the width or diameter of the dot openings is between, but is not limited to, about 0.05 mm to about 2 mm. In this embodiment, the material of the first insulating layer 12 includes or can be selected from insulating paints such as epoxy resins, silicone nonflammable paints, enamel paints, or other insulating materials. The connecting portion 26 is in contact with the first winding 22 and the second winding 24 through the opening 12S of the first insulating layer 12. Further, the second insulating layer 14 covers the first insulating layer 12 and the connecting layer 26, and fills the opening 12S of the first insulating layer 12. In this embodiment, the material of the second insulating layer 14 includes or can be selected from insulating paints such as epoxy resins, silicone nonflammable paints, enamel paints, or other insulating materials. Insulating rod 10, first winding 22, second winding 24, connection layer 26, first cap 32, second cap 34, first electric cover layer 361, second electric cover of the fuse resistor 2 in this embodiment. The location, connection method, materials, and other properties of components such as layer 362, first wire 42, and second wire 44 are similar to those of fuse resistor 1 in FIG. 1 and are not repeated here.

See FIGS. 7, 8 and 9. 7 to 9 are schematic views showing a method of manufacturing a fuse resistor according to another embodiment of the present disclosure. As shown in FIG. 2, the insulating rod 10 is provided. The insulating rod 10 has a first end portion 101 and a second end portion 102. Subsequently, the winding 21 is wound around the insulating rod 10. In some embodiments, the first cap 32 and the second cap 34 may be formed on both sides of the insulating rod 10, but on the outside of the first cap 32 and the second cap 34, the first wire 42 and the second, respectively. The wire 44 can be formed outward. In some embodiments, both ends of the winding 21 can be welded to the first cap 32 and the second cap 34 by electrical welding, respectively. For example, first one end of the winding 21 is electrically welded to the first cap 32, then the winding 21 is wound around the insulating rod 10, and then the other end of the winding 21 is electrically welded to the second cap 34. be able to. Subsequently, the first insulating layer 12 is formed on the insulating rod 10 and the winding 21.

As shown in FIG. 8, the opening 12S is formed in the first insulating layer 12, and the winding 21 is cut to form the first winding 22 and the second winding 24 separated from each other. In some embodiments, the opening 12S of the first insulating layer 12 is a dot opening that partially exposes the insulating rod 10. In some embodiments, the formation of the dot openings in the first insulating layer 12 and the formation of cuts in the winding 21 can be performed simultaneously. In some embodiments, for example, forming a dot opening in the first insulating layer 12 and cutting the winding 21 can be performed using a cutting tool. As shown in FIG. 9, a connecting portion 26 is formed in a dot opening in order to electrically connect the first winding 22 to the second winding 24. In some embodiments, the connection portion 26, electroplating, may be formed by dipping the tin bath or other suitable processes. In some embodiments, the first electrical cover layer 361 is provided to enhance the strength of the weld points of the first winding 22 and the first cap 32, and the weld points of the second winding 24 and the second cap 34. Use to electrically connect one end of the first winding 22 to the first cap 32 (eg electroplating) and use the second electrical cover layer 362 to attach one end of the second winding 24 to the second cap. An electrical connection (eg, electroplating) can be made to 34, increasing the reliability of the weld point. As shown in FIG. 6, the second insulating layer 14 is then formed so as to cover the first insulating layer 12 and the connecting portion 26, and the opening 12S of the first insulating layer 12 is filled with the embodiment of the present disclosure. Fuse resistor 2 is manufactured.

In the fuse resistor of the present disclosure, since the first winding and the second winding are electrically connected using a connection portion , the fusing temperature and the fusing speed of the resistor can be controlled, and the applicable range and safety of the resistor can be controlled. Improve. In addition, in the fuse resistors of the present disclosure, the electrical cover layer is used to reinforce the weld point between the winding and the cap, increasing the tightness of the weld, avoiding loosening of the winding and manufacturing defects. To reduce. Therefore, the fuse resistor of the present disclosure has a failure rate of less than 0.1 ppm at the surge-resistant weld point. The fuse resistors of the present disclosure can improve the surge resistance effect of fuse resistors and can be applied to circuits such as surge resistance circuits, spark plugs, and ignition systems of automobiles and motorcycles.

Although the present disclosure has been described in considerable detail with reference to that particular embodiment, these descriptions and examples are not intended to limit the present disclosure. Those skilled in the art will be able to make various changes and, in embodiments, replace equivalent elements without departing from the spirit and scope of the present disclosure set forth in the appended claims. Will be clearly understood.

Claims (15)

A single fuse resistor, a wire-wound resistor, the fuse resistor,
An insulating rod having a first end and a second end seen including,
The winding to be cut on the insulating rod
A first winding around which the insulating rod is wound from the first end portion of the insulating rod, and
A second winding around which the insulating rod is wound is formed from the second end of the insulating rod.
The first winding is separated from the second winding,
Connecting portion is disposed between said first winding and said second winding,
Melting point of the connecting portion is lower than the melting point of the first winding and said second winding,
The first winding and the second winding are separated from each other.
It is electrically connected via the connection portion,
A first cap that is closed from the first end of the insulating rod and electrically welded to the end of the first winding.
A second cap that is closed from the second end of the insulating rod and electrically welded to the end of the second winding.
A first electric cover layer that electrically connects one end of the first winding to the first cap,
Includes a second electrical cover layer that electrically connects one end of the second winding to the second cap.
The first electric cover layer, the second electric cover layer, and the connection portion are
Fuse resistors formed together by the same process. The fuse resistor according to claim 1, further comprising a first insulating layer, covering the first winding and the second winding, the first insulating layer having an opening that exposes a part of an insulating rod. .. The fuse resistor according to claim 2, wherein the material of the first insulating layer includes an epoxy resin, a silicone nonflammable paint, or an enamel paint. The fuse resistor according to claim 2, wherein the opening includes a slot opening and surrounds and partially exposes the insulating rod. The fuse resistor according to claim 2, wherein the opening includes a dot opening and partially exposes the insulating rod. The fuse resistor according to claim 2, wherein the connection portion is in contact with the first winding and the second winding through the opening of the first insulating layer. The fuse resistor according to claim 6, further comprising the first insulating layer and a second insulating layer covering the connecting portion , and filling the opening of the first insulating layer. The fuse resistor according to claim 7, wherein the material of the second insulating layer includes an epoxy resin, a silicone nonflammable paint, or an enamel paint. The fuse resistor according to claim 1 , wherein the material of the first electric cover layer and the second electric cover layer contains tin, copper, iron, silver, nickel, or an alloy thereof, respectively. The fuse resistor according to claim 1 , wherein the thickness of the first electric cover layer and the second electric cover layer is between 1 micrometer and 20 micrometers, respectively. One is the manufacturing method of fuse resistors.
Provide an insulating rod,
Wind the winding around the insulating rod
The windings are cut to form the first and second windings separated from each other .
A connection portion for electrically connecting the first winding to the second winding is formed.
Melting point of the connecting portion, rather lower than the melting point of the first winding and said second winding,
Cover the first end of the insulating rod with the first cap.
Cover the second end of the insulating rod with the second cap and
Electric welding one end of the winding to the first cap
Electric welding the other end of the winding to the second cap
Using the first electric cover layer to electrically connect one end of the first winding to the first cap,
Including electrical connection of one end of the second winding to the second cap using a second electrical cover layer.
The first electric cover layer, the second electric cover layer, and the connection portion are
A method of manufacturing fuse resistors, which are formed together by the same process. To form a first insulating layer on the insulating rod and the winding before cutting the winding.
The method for manufacturing a fuse resistor according to claim 11 , further comprising forming an opening in the first insulating layer and cutting the winding. The method for manufacturing a fuse resistor according to claim 12 , wherein the opening includes a slot opening and surrounds and partially exposes the insulating rod. The method for manufacturing a fuse resistor according to claim 12 , wherein the opening includes a dot opening and partially exposes the insulating rod. Form a second insulating layer,
Cover the first insulating layer and the connection part ,
The method for manufacturing a fuse resistor according to claim 12 , further comprising filling the opening of the first insulating layer.

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