JP2000082601A - Resistor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resistor which can be used even with a high power, and to provide a resistor in which a resistance value range can be made wide and surface mounting can be realized. SOLUTION: This resistor is constituted of a resistance element 11 in which a base body is coated with a resistance film, metallic caps 12 and 12' press-fit to the both edges of the resistance element 11, a case 14 having an opening for including the resistance element 11 on the upper face, plate-shaped electrode terminals 13 and 13' whose one top ends are brought into contact with the metallic caps 12 and 12' and whose other top ends are formed outside the opening of the case 14 and along the upper faces of the top ends of the case 14, and insulating material 15 for sealing the resistance element 11 in the case 14.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power type resistor of a surface mount type and a method of manufacturing the same.

[0002]

2. Description of the Related Art As a prior art, Japanese Patent Laid-Open No. 6-2080 is disclosed.
No. 2 is known.

[0003] A conventional resistor will be described below with reference to the drawings. FIG. 9A is a perspective view of a conventional resistor, and FIG. 9B is a sectional view of the same.

In FIGS. 9 (a) and 9 (b), reference numeral 1 denotes a resistance portion, and a pair of terminals 2 and 3 for mounting a resistor on a mounting board at both ends are provided, and the resistance portion 1 and a pair of terminals are provided. The parts 2 and 3 are made of the same metal plate having an integral structure. The resistor 1 has a predetermined distance from the terminals 2 and 3 in order to keep a distance from the mounting board surface. 4 is a resistor 1
Is an insulating material provided so as to cover the surrounding area, and has a function of protection and heat dissipation.

A method of manufacturing the conventional resistor having the above-described structure will be described below with reference to the drawings.

First, as shown in FIGS. 10A and 10B,
The resistance part 1 is formed of a metal plate having a predetermined resistance value, and the terminal parts 2 and 3 are formed at both ends of the resistance part 1.
Then, the terminal portions 2 and 3 are bent downward.

Finally, as shown in FIG. 10 (c), a conventional resistor is manufactured by coating an insulating material around the resistor portion 1.

[0008]

In the conventional resistor constructed as described above, a metal material which can be soldered at the time of board mounting must be selected as a material of the terminal portion. Inevitably, the metal material of the resistance portion is limited to a copper-nickel-based or nickel-based alloy that can be soldered, and as a result, only a relatively low resistance value region can be handled.

In addition, as for the adjustment of the resistance value of the conventional resistor, the specific resistance is changed by changing the metal material and the composition of the resistor portion and the terminal portion, and the width and thickness of the metal material are adjusted. A method was being attempted.

However, when the metal material is changed or the composition is adjusted, the resistance-temperature characteristic changes simultaneously with the increase or decrease of the specific resistance, and only a limited material or composition that meets the specifications is obtained. It was hard to be.

In addition, when changing the width and thickness of the plate-shaped metal material, the metal plate must be thinned in order to obtain a high resistance value. At this time, the workability and bending strength of the metal material must be ensured. However, there is a problem in manufacturing such that the metal material is broken when the bending process is performed. Therefore, only a resistor having a relatively low resistance value could be manufactured.

Conventionally, after depositing a film of metal, metal oxide, carbon or the like on a substrate, lead terminals are pressed into both ends, and a resistor covered with an insulating paint, ie,
Metal film resistors, metal oxide film resistors, carbon film resistors, and the like are widely known. However, these resistors are of high power type and are not suitable for surface mounting. Although these high power type surface mount products have been produced, only low power products have been realized because it is necessary to consider the temperature rise of the mounting board.

An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a resistor which can be used at high power, has a wide resistance value range, and can be surface-mounted.

[0014]

In order to achieve the above object, the present invention provides a resistive element having a resistive film deposited on a base, a metal cap press-fitted at both ends of the resistive element, A case having an opening on the top surface for inclusion,
A plate-like electrode terminal that is in contact with the metal cap at the tip and the other tip is out of the opening of the case and is along the upper surface of the end of the case, and the resistance element is sealed in the case. It is composed of an insulating material for stopping, so that instead of a metal plate, the element parts excluding the lead terminals and insulating paint such as metal film resistors, metal oxide film resistors, carbon film resistors, etc. A plate used as a resistance element, selecting a film, providing a spiral grooving or cutting part on the surface of the film, adjusting the number of turns and the film thickness of the film, and further out of the case opening Can be attached to the mounting substrate. Therefore, it can be used even with high power,
A resistor having a wide resistance value range and capable of surface mounting can be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention according to claim 1 of the present invention is directed to a resistance element having a resistance film formed on a substrate, a metal cap press-fitted at both ends of the resistance element, and an enclosure including the resistance element. And a plate-shaped electrode terminal that is in contact with the metal cap at one end and the other end is out of the opening of the case and extends along the upper surface of the end of the case. And an insulating material for sealing the resistance element in the case. According to this configuration, a metal film resistor, a metal oxide film resistor, and a carbon film resistor are used instead of a metal plate. The element part excluding the lead terminal and insulating paint can be used as a resistance element, and the selection of the film and the spiral groove and cutting part on the surface of the film are provided, and the number of turns and the film thickness of the film are adjusted. Can be used at high power, and In addition to the resistance range widely, since it is possible to attach the plate-shaped electrode terminals that are outside the opening of the case to the mounting substrate, and has an effect that it is possible to surface mounting.

According to a second aspect of the present invention, the contact portion between the metal cap and the electrode terminal is fixed by electric welding. According to this configuration, the mechanical strength between the metal cap and the electrode terminal is improved. And the effect of reducing the contact resistance between the metal cap and the electrode terminal.

According to a third aspect of the present invention, there is provided a resistive element having a resistive film deposited on a base, a case having an opening for enclosing the resistive element, and a tip contacting the resistive element and having the other end. A plate-shaped electrode terminal whose tip is out of the opening of the case and extends along the upper surface of the end of the case, and an insulating material for sealing the resistance element in the case, According to this configuration, in addition to the same function as that of the first aspect, the resistance element and the electrode terminal are directly in contact with each other, so that the contact resistance between the two can be reduced. This has the effect that a simple resistor can be manufactured.

According to a fourth aspect of the present invention, there is provided a resistive element having a resistive film deposited on a base, a case having an opening for enclosing the resistive element, and a tip contacting the other end of the resistive element and the other end. A plate-like electrode terminal having a tip out of the opening of the case and along the upper surface of the end of the case; and the resistor and the electrode for electrically connecting the resistor and the electrode terminal. It is made of a conductive resin applied between terminals and an insulating material for sealing the resistance element in the case. According to this configuration, in addition to the same operation as in claim 3, the resistance element and Since the conductive resin is formed between the electrode terminals, the adhesion between the resistance element and the electrode terminals can be improved,
Further, it has an effect that a resistor having a small contact resistance between the resistance element and the electrode terminal can be manufactured.

According to a fifth aspect of the present invention, the ends of the electrode terminals protruding outside the opening of the case are further provided integrally along the end face of the case. Since part of the electrode terminal can be placed on the upper surface of the end, the insertability of the electrode terminal is improved, and at the same time, the positioning can be performed accurately, and the electrode terminal along the upper surface of the end of the case is used as an electrode. Since the electrode terminals can be attached to the mounting board and the electrode terminals are arranged along the end face of the case, the soldering area is increased, and the surface mounting property is further improved.

According to a sixth aspect of the present invention, the electrode terminal and the metal cap or the resistive element are fitted by fitting such that one surface is convex and the other surface is concave at the contact portion. According to this configuration, when the electrode terminal and the metal cap, or the electrode terminal and the resistance element are in contact with each other, the projection and the depression are engaged with each other, so that the positioning between the electrode terminal and the metal cap or the resistance element can be easily performed. This has the effect of increasing the tensile strength of the electrode terminal.

According to a seventh aspect of the present invention, a metal cap or a folded portion which elastically contacts a resistive element or a conductive resin is provided at an end of an electrode terminal located in a case. According to this, since the resistance element or the resistance element and the metal cap can be sandwiched between the inner surfaces of both ends of the case by the elasticity of the folded electrode terminal, the effect of increasing the tensile strength of the electrode terminal can be obtained. Have

According to the eighth aspect of the present invention, two convex portions for regulating the positions of the electrode terminals are provided on the inner surfaces of both end surfaces of the case, respectively. Since the electrode terminals can be prevented from being displaced in the width direction of the case by the two convex portions, the insertion and positioning of the electrode terminals into the case can be accurately performed, and thereby the positions of the electrode terminals exposed outside the opening of the case. Since the accuracy can be improved, it can be mounted with high positional accuracy even when the mounting area of the resistor is limited, such as when the land pattern on the mounting board is small, and this has the effect of enabling high-density mounting. is there.

According to the ninth aspect of the present invention, a narrow portion for relaxing stress is provided in a part of the electrode terminal. According to this configuration, stress concentrates on the narrow portion of the electrode terminal, Since this part serves as a stress relief part, even if an excessive stress such as impact or bending stress is applied to the resistor mounted on the board, the bonding property between the mounting board and the resistor may be reduced, or the insulating material may be damaged. Cracks and the like can be prevented, thereby providing a highly reliable resistor.

According to a tenth aspect of the present invention, the thermal expansion coefficient of the base is the same as that of the case. According to this structure, the base and the case have the same thermal expansion coefficient. Even when a temperature shock is applied due to repeated energization and pauses, the base and the case repeatedly expand and contract at the same rate, and this does not cause problems such as cracks in the insulating material. It has the effect that the property can be secured.

According to an eleventh aspect of the present invention, in the case, the tip of the electrode terminal enters the case and the other tip goes out of the opening of the case and follows the upper surface of the end of the case. A step of inserting the electrode terminal, a step of depositing a resistive film on a base and inserting a resistive element having a metal cap press-fitted at both ends into the case, and bonding the electrode terminal and the metal cap. Enclosing the sealed state in the case with an insulating material. According to this manufacturing method, in addition to the same operation as in claim 1, the resistance element utilizes the spring property of the electrode terminal. It has the function of being held between the electrode terminals.

According to a twelfth aspect of the present invention, in the case, the tip of the electrode terminal enters the case and the other tip goes out of the opening of the case and follows the upper surface of the end of the case. A step of inserting the electrode terminal, a step of inserting a resistive element having a resistive film deposited on a substrate into the case, and a step in which the electrode terminal and the resistive element are joined with an insulating material. According to this manufacturing method, in addition to the same operation as in claim 3, the effect that the resistive element is held between the electrode terminals by utilizing the spring properties of the electrode terminals is provided. Have

According to a thirteenth aspect of the present invention, in the case, the tip of the electrode terminal enters the case and the other tip goes out of the opening of the case and follows the upper surface of the end of the case. A step of inserting the electrode terminal, a step of inserting a resistive element having a resistive film deposited on a base into the case, and insulating the electrode terminal and the resistive element in a state where they are joined by a conductive resin. According to this manufacturing method, the resistance element is held between the electrode terminals by utilizing the spring properties of the electrode terminals. This has the effect of

According to a fourteenth aspect of the present invention, a step of electrically welding a metal cap press-fitted to both ends of a resistance element and an electrode terminal, wherein the tip of the electrode terminal enters the case and the other tip is A step of inserting the electrode terminal into the case so as to go out of the opening of the case and along an upper surface of an end of the case; and a step of embedding the resistance element in the case with an insulating material. According to this manufacturing method, it has the same function as the second aspect.

Embodiment 1 Hereinafter, a resistor according to Embodiment 1 of the present invention will be described with reference to the drawings. FIG. 1A is a perspective view of the resistor according to the first embodiment of the present invention, FIG.
(C) is the same sectional view from above.

In FIG. 1, reference numeral 11 denotes a resistance element, which is formed by depositing a resistance film on the surface of a cylindrical or quadrangular prism base. As the type of resistance film, for example, a copper-nickel alloy film or a nickel-phosphorus alloy film formed by electroless plating or electroplating in a low resistance value region, and formed by a thermal decomposition deposition method in an intermediate resistance value region. Select a tin-antimony metal oxide film and a carbon film in the high resistance value area.Select these films and provide spiral grooves and cuts on the surface of the film to adjust the number of turns and film thickness. By doing so, a wide range of resistance values can be obtained as well as a low resistance value. Also,
As the resistive element, high-power type copper nickel alloy film resistor, nickel phosphorus alloy film resistor, tin antimony metal oxide film resistor, carbon film resistor, etc. , The resistor of the present invention can be used even at high power.

Reference numerals 12 and 12 'denote metal caps, which are press-fitted at both ends of the resistance element 11, and cylindrical or square caps can be used according to the shape of both ends of the resistance element 11.
As the material of the metal caps 12 and 12 ', a material in which the surface of an iron plate is plated with copper, tin, or tin-lead is used. In particular, a copper-nickel alloy film, a nickel-phosphorus alloy film, or the like having a low resistance value region is used. When a relatively thick plating film is formed, a copper plate or a copper-nickel plate having a similar expansion coefficient may be used in order to suppress a change in characteristics by matching thermal expansion with the plating film.

Reference numerals 13 and 13 'denote a pair of electrode terminals, which are provided so that their tips abut the metal caps 12 and 12'. Metals with relatively low specific resistance, such as copper and copper plates, are used. A plating layer made of tin or tin and lead is provided on the surface, and the electrode terminals 13 and 13 ′ are provided.
Increases rust prevention on the surface and ensures long-term excellent solderability.

Reference numeral 14 denotes a case, which has an opening for enclosing the resistance element 11 on its upper surface and is made of a ceramic or resin molded product containing 5 to 96% of alumina. The other ends of the electrode terminals 13 and 13 ′ extend outside the opening of the case 14, and are integrally provided along the upper surface of the end of the case 14 and the end surface of the case 14. Thereby, the electrode terminals 13 and 1 are provided on the upper surface of the end of the case 14.
3 'can be placed on the electrode terminal 13,
In addition to improving the insertability of the 13 ', the positioning can be performed with high accuracy, and the electrode terminals 13, 13' along the upper surface of the end of the case 14 can be attached to the mounting substrate as electrodes, thereby enabling surface mounting. Becomes possible. Further, since the electrode terminals 13 and 13 'are arranged along the end surfaces of the case 14, the soldering area is increased, and further excellent surface mountability is obtained.

An insulating material 15 is injected into the case 14 to seal the resistance element 11, and is made of cement or resin containing alumina powder or silica powder.

The method of manufacturing the resistor according to the first embodiment of the present invention configured as described above will be described below with reference to the drawings.

FIGS. 2 and 3 show Embodiment 1 of the present invention.
FIG. 4 is a process chart showing a method of manufacturing the resistor in FIG.

First, as shown in FIG. 2A, a resistance element 11 having a resistance film deposited on the surface of a substrate is formed.

Next, as shown in FIG. 2B, a pair of metal caps 12, 12 'are press-fitted so as to match the shape of both ends of the resistance element 11.

Next, as shown in FIG. 2C, after the metal plate is processed into a U-shape to form the electrode terminals 13 and 13 ',
The electrode terminals 1 are placed so as to cover both ends of the upper surface of the case 14.
Insert 3,13 '.

Next, as shown in FIG.
The resistance element 11 manufactured in (b) is connected to the electrode terminals 13 and 13 '.
Is inserted into the case 14 so as to contact the surface.

As described above, the electrode terminal 1 is placed in the case 14.
Since the resistance element 11 is inserted after the insertion of the resistance element 13 and 13 ', the resistance element 11 is sandwiched between the pair of electrode terminals 13 and 13' when the resistance element 11 is inserted. And the resistance element 11
Is the electrode terminal 1 utilizing the spring properties of the electrode terminals 13 and 13 '.
3 and 13 ', and since the resistance element 11 is not inserted first, there is no need to create a gap between the case 14 and the resistance element 11, and the insertability of the electrode terminals 13, 13' is improved. After the resistance element 11 is inserted into the case 14, even if the electrode terminals 13 and 13 'are inserted, the resistance element 11 uses the spring properties of the electrode terminals 13 and 13' to make the electrode terminal 1
It is held between 3, 13 '.

Finally, as shown in FIG. 3B, an insulating material 15 is poured into the case 14, dried and cured to complete the fabrication.

Hereinafter, a comparison of the resistance value range between the resistor according to the first embodiment of the present invention and the conventional resistor will be described.

First, in the conventional resistor, the resistance value can be adjusted to some extent by using a metal plate having a different specific resistance or by adjusting the width and thickness of the metal plate.
Since the resistance portion has an integral structure with the electrode portion, the resistance portion is limited to a resistance material or a metal composition that can be soldered at the terminal portion, so that the resistance portion can be manufactured only from several mΩ to several tens mΩ.

However, according to the resistor of the present invention, a resistance film having a different specific resistance can be formed by using a conventional deposition method such as a plating method, a thermal decomposition deposition method, and a vapor deposition method, and By providing a spiral groove or cutting part in the resistance element, the resistance value can be increased up to about 1000 times,
Furthermore, by using a combination of a copper-nickel alloy film, a nickel-phosphorus alloy film, a tin antimony oxide metal film, and a nickel-chromium metal film, a resistance value of 5 mΩ to 1 MΩ can be manufactured.

The metal caps 12, 12 'and the electrode terminals 13, 13' have been described as being merely in contact with each other. However, if the metal caps 12, 12 'are fixed by electric welding, the metal caps 12, 12' can be connected to the metal caps 12, 12 '. Improvement of mechanical strength between the electrode terminals 13 and 13 'and the metal caps 12 and 12' and the electrode terminals 1
The contact resistance between 3, 13 'can be reduced. At this time, in addition to electric welding, a method that does not damage the resistance element, such as laser welding, can be used.

Embodiment 2 Hereinafter, a resistor according to Embodiment 2 of the present invention will be described with reference to the drawings. FIG. 4A is a perspective view of the resistor according to the second embodiment of the present invention, FIG.
(C) is the same sectional view from above.

In FIG. 4, the metal caps 12, 1
Embodiment 2 is different from Embodiment 1 in that 2 ′ is not used.
As for the manufacturing method, basically, FIGS. 2 (a) to 2 (c),
3 (a) and 3 (b), except that there is no step of FIG. 2 (b). The other configuration and the manufacturing method are the same as those of the resistor of the first embodiment, and thus description thereof is omitted.
Assign the same sign.

Thus, in addition to the effect of the first embodiment, since the resistance element 11 and the electrode terminals 13 and 13 'are in direct contact, the contact resistance between the two can be reduced, and the metal caps 12 and 13' can be reduced. Since it is not necessary to use 12 ', an effect that an inexpensive resistor can be manufactured can be obtained.

As described above, also in the resistor according to the second embodiment of the present invention, the resistance value range could be expanded from 4 mΩ to 1 MΩ.

(Embodiment 3) Hereinafter, a resistor according to Embodiment 3 of the present invention will be described with reference to the drawings. FIG. 5A is a perspective view of a resistor according to Embodiment 3 of the present invention, FIG.
(C) is the same sectional view from above.

In FIG. 5, the resistance element 11 and the electrode terminal 1
The difference is that the conductive material 16 is applied to the contact portions with the third and third ′ s. As for the manufacturing method, basically, FIGS.
(C), the same as FIGS. 3 (a) and (b), but FIG.
There is no step (b), and after FIG. 3 (a), a conductive material 16 made of a resin containing a metal powder is applied to the contact portions between the resistance element 11 and the electrode terminals 13 and 13 'and temporarily dried. The points are different. The other configuration and the manufacturing method are the same as those of the resistor according to the first embodiment, and thus description thereof is omitted, and the same reference numerals are given.

Thus, in addition to the effects of the second embodiment,
Conductive resin 1 between resistance element 11 and electrode terminals 13, 13 '
6, 16 ', the resistance element 11 and the electrode terminal 1
3, 13 'can be improved, and the resistance element 11
The effect that the contact resistance between the electrode terminals 13 and 13 'can be reduced can also be obtained.

As described above, also in the resistor according to the third embodiment of the present invention, the resistance value range could be expanded from 4 mΩ to 1 MΩ.

It should be noted that a new effect can be expected by adopting the following configuration with respect to the configuration of the first, second, or third embodiment.

As shown in the sectional view from the side of the resistor in FIG. 6, the electrode terminals 13 and 13 'and the metal caps 12 and 1 are provided.
The electrode terminals 13 and 13 'and the metal cap 12 are formed by making one surface convex and the other surface concave so that the 2' or the resistance element 11 is fitted to the contact portion by fitting. , 12 ′ or the electrode terminals 13, 13 ′ and the resistance element 11, the projections and the depressions are engaged with each other, so that the electrode terminals 13, 13 ′ and the metal caps 12, 1 are engaged.
Positioning with the 2 'or the resistance element 11 can be facilitated, and the tensile strength of the electrode terminals 13, 13' can be increased.

As shown in the cross-sectional view from the side of the resistor in FIG. 7, by folding the ends of the electrode terminals 13, 13 'in the case 14, the folded electrode terminals 13, 1 are obtained.
The resistance element 11 or the resistance element 1
1 and the metal caps 12, 12 'can be sandwiched between the inner surfaces of both ends of the case 14, so that the tensile strength of the electrode terminals 13, 13' can be increased.

Also, as shown in the cross-sectional view from the top of the resistor in FIG. 8, by providing two convex portions 17 on the inner surfaces of both ends of the case 14, two of the inner surfaces of both ends of the case 14 are formed. Since the position of the electrode terminals 13 and 13 ′ is regulated by the protrusions 17 and can be prevented from shifting in the width direction of the case 14, the insertion and positioning of the electrode terminals 13 and 13 ′ into the case 14 can be performed accurately. This makes Case 1
Since the positional accuracy of the electrode terminals 13 and 13 'exposed outside the opening 4 can be improved, even when the mounting area of the resistor is limited, such as when the land pattern on the mounting board is small, the mounting can be performed with high positional accuracy. This enables high-density mounting.

Further, of the electrode terminals 13, 13 ′, the electrode terminals 13, 13 ′ and the resistance element 11 or the metal cap 1
The width of a part or all of a portion between the bonding portion of the electrode terminals 13 and 13 'is smaller than that of the other portion of the electrode terminals 13 and 13'. As a result, stress concentrates on the narrow portions of the electrode terminals 13 and 13 ′, and this portion becomes a stress relieving portion. Therefore, excessive stress such as impact or bending stress is applied to the resistor mounted on the substrate. , It is possible to prevent a decrease in bondability between the mounting substrate and the resistor, generation of cracks in the insulating material 15, cracking of the mounting substrate, and the like, whereby a highly reliable resistor can be obtained.

Further, when the thermal expansion coefficient of the
In this case, the base and the case 14 repeatedly expand and contract at the same rate even when the resistor is subjected to a temperature shock due to repetition of energization and rest, thereby causing cracks in the insulating material 15. Since such troubles do not occur, long-term characteristic stability can be ensured.

[0061]

As described above, according to the present invention, a resistive element having a resistive film deposited on a base, a metal cap press-fitted at both ends of the resistive element, and an opening for enclosing the resistive element are provided. A plate-shaped electrode terminal whose upper end is in contact with the metal cap and whose other end is out of the opening of the case and extends along the upper surface of the end of the case; and And an insulating material for sealing the inside of the case. According to this configuration, instead of the metal plate, a metal film resistor, a metal oxide film resistor, a lead terminal such as a carbon film resistor, etc. The element part excluding the insulating paint can be used as a resistance element, and the selection of the film and the spiral groove and cutting part on the surface of the film can be adjusted to adjust the number of turns and the film thickness of the film, resulting in high power. But it can be used and the resistance value range In addition to being able to widely, since it is possible to attach the plate-shaped electrode terminals that are outside the opening of the case to the mounting substrate, an advantageous effect that it is possible to surface mount can be obtained.

[Brief description of the drawings]

1A is a perspective view of a resistor according to a first embodiment of the present invention, FIG. 1B is a cross-sectional view from the side, and FIG.

FIG. 2 is a process chart showing the first half of the method of manufacturing the resistor according to the first embodiment of the present invention.

FIG. 3 is a process chart showing the latter half of the method of manufacturing the resistor according to the first embodiment of the present invention.

4A is a perspective view of a resistor according to a second embodiment of the present invention. FIG. 4B is a cross-sectional view from the side. FIG.

5A is a perspective view of a resistor according to a third embodiment of the present invention, FIG. 5B is a cross-sectional view from the side, and FIG.

FIG. 6 is a cross-sectional view of a resistor that is a modification of the first, second, or third embodiment of the present invention.

FIG. 7 is a cross-sectional view of a resistor that is a modification of the first, second, or third embodiment of the present invention.

FIG. 8 is a cross-sectional view of a resistor according to a modification of the first, second, or third embodiment of the present invention.

9A is a perspective view of a conventional resistor, and FIG.

FIG. 10 is a process chart showing a conventional method for manufacturing a resistor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Resistance element 12, 12 'Metal cap 13, 13' Electrode terminal 14 Case 15 Insulating material 16, 16 'Conductive resin 17 Convex part

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 5E028 AA04 AA10 BA03 BA11 BB01 CA03 DA04 EA03 EA13 EA14 EA21 EA23 EB02 EB06 GA04 JA04 JA06 JA07 JA11 JA13 JA16 JB03 JB06 JC01 JC06 JC12 5E032 AB00 CC11 CC14 DA11

Claims (14)

[Claims] A resistive element having a resistive film deposited on a base;
A metal cap press-fitted at both ends of the resistance element, a case having an opening for enclosing the resistance element on an upper surface, and a tip in contact with the metal cap at the tip and the other tip being outside the opening of the case. A resistor comprising a plate-like electrode terminal extending out along an upper surface of an end portion of the case and an insulating material for sealing the resistance element in the case. 2. A contact portion between a metal cap and an electrode terminal,
2. The resistor according to claim 1, wherein the resistor is fixed by electric welding. 3. A resistance element having a resistance film deposited on a base,
A case having an opening for containing the resistance element,
A plate-like electrode terminal that is in contact with the resistance element at the tip and the other tip is out of the opening of the case and is along the upper surface of the end of the case; and the resistance element is sealed in the case. Resistor made of insulating material. 4. A resistance element having a resistance film deposited on a base,
A case having an opening for containing the resistance element,
A plate-shaped electrode terminal that is in contact with the resistance element at the tip and the other tip is out of the opening of the case and is along the upper surface of the end of the case; and electrically connects the resistance element and the electrode terminal. 4. The resistor according to claim 3, comprising a conductive resin applied between the resistance element and the electrode terminal for connection to the resistor, and an insulating material for sealing the resistance element in the case. 5. 5. The resistor according to claim 1, wherein the ends of the electrode terminals protruding outside the opening of the case are further provided integrally along the end face of the case. 6. The contact according to claim 1, wherein the electrode terminal and the metal cap or the resistive element are fitted by fitting such that one surface is convex and the other surface is concave at the contact portion. Resistor. 7. The resistor according to claim 1, wherein a metal cap or a folded portion elastically contacting a resistive element or a conductive resin is provided at an end of the electrode terminal located in the case. 8. The resistor according to claim 1, wherein two convex portions for regulating the positions of the electrode terminals are provided on the inner surfaces of both end surfaces of the case. 9. The resistor according to claim 1, wherein a narrow portion for relaxing stress is provided in a part of the electrode terminal. 10. The resistor according to claim 1, wherein the thermal expansion coefficient of the base is the same as that of the case. 11. A step of inserting the electrode terminal into the case so that the tip of the electrode terminal enters the case and the other tip goes out of the opening of the case and follows the upper surface of the end of the case. Inserting a resistive element in which a resistive film is deposited on a base and metal caps are press-fitted at both ends into the case; and a step in which the electrode terminal and the metal cap are joined to each other is an insulating material. And a step of encapsulating the resistor in the case. 12. A step of inserting the electrode terminal into the case so that the tip of the electrode terminal enters the case and the other tip goes out of the opening of the case and follows the upper surface of the end of the case. And a step of inserting a resistive element having a resistive film deposited on a base into the case, and a step of enclosing the electrode terminal and the resistive element in a joined state in the case with an insulating material. A method for manufacturing a resistor, comprising: 13. A step of inserting the electrode terminal into the case such that the tip of the electrode terminal enters the case and the other tip goes out of the opening of the case and follows the upper surface of the end of the case. And a step of inserting a resistive element having a resistive film deposited on a base into the case, and placing the electrode terminal and the resistive element in a state of being joined by a conductive resin in the case with an insulating material. Enclosing a resistor. 14. A step of electrically welding a metal cap press-fitted to both ends of a resistance element and an electrode terminal, wherein the tip of the electrode terminal enters the case and the other end thereof comes out of the opening of the case. A step of inserting the electrode terminal into the case so as to extend along an upper surface of an end of the case; and a step of burying the resistance element in the case with an insulating material. Manufacturing method.