JPH11251103A - Resistor and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resistor the resistance element section of which can be positioned with high accuracy,without deteriorating the workability of the inserting work of the resistance element section, while a clearance is maintained in the width direction between the internal surface of a case and the element section when the element section is inserted into the case. SOLUTION: A resistor is provided with a resistance body 11 consisting of a metallic plate in which a resistance element section 12 and electrode terminal sections 13 and 14 are integrally formed, a case 15 which houses the resistance element section 12 of the resistance body 11 and is composed of an insulator having at least one open face, and an insulating material 16 which seals the resistance element section 12 of the resistance body 11 in the case 15. The case 15 has notches 17 on its internal surface for the insertion and positioning of the resistance element section 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a current detecting resistor for detecting a current value in an electronic circuit as a voltage value, and a method of manufacturing the same.

[0002]

2. Description of the Related Art FIG.
Resistors as shown in (a), (b) and (c) are known.

FIG. 8A is a perspective view of a conventional resistor, and FIG.
8B is a bottom view of the resistor, and FIG. 8C is a side sectional view of the resistor.

In FIGS. 8 (a), 8 (b) and 8 (c), reference numeral 1 denotes a resistance element portion made of a metal plate-shaped alloy integrally formed with the opposed electrode terminal portions 2 and 3. Reference numerals 2 and 3 denote electrode terminal portions forming both ends of an integrated structure made of the same metal as the resistance element portion 1. Reference numeral 4 denotes a bathtub-type case serving as an exterior material for enclosing the resistance element portion 1 with an insulating material 5. Reference numeral 5 denotes an insulating material for sealing the resistance element unit 1 in the case 4.

The inner surface of the case 4 and the resistance element 1
A gap is provided between the width direction and the width direction so that the insulating material 5 smoothly goes from the lower layer portion to the upper surface portion of the resistance element portion 1 when the resistance element portion 1 is inserted.

Next, a method of manufacturing the conventional resistor having the above-described structure will be described with reference to the drawings.

FIGS. 9A to 9E are process diagrams showing a conventional method for manufacturing a resistor. First, as shown in FIG. 9A, a case 4 having one opening 4a into which the resistive element 1 processed in a later step can be inserted is manufactured.

Next, as shown in FIG. 9B, a metal plate-shaped resistance element portion 1 containing copper or nickel and having a predetermined thickness and width is formed.

Next, as shown in FIG. 9 (c), bending is performed at a predetermined dimension in the plane direction of the resistance element portion 1 in the form of a metal plate, and electrode terminals are provided on opposite ends of the resistance element portion 1. Parts 2 and 3 are formed. When bending the resistance element portion 1, the distance between the electrode terminal portions 2 and 3 and the distance between the surface of the resistance element portion 1 and the electrode terminal portions 2 and 3 depend on the land pattern shape of the board to be mounted. Processing is performed while adjusting the step size with the surface, and adjustment is performed so as to match the target resistance value.

Next, as shown in FIG. 9D, an appropriate amount of an insulating material 5 prepared by mixing a main agent and a curing agent is injected into the case 4. The injection of the insulating material 5 is performed before the processed resistance element portion 1 is inserted into the case 4, so that when the resistance element portion 1 is inserted into the case 4, the insulating material 5 is insulated to every corner in the case 4. Complete sealing is performed by spreading the material 5.

Finally, as shown in FIG. 9E, the bent resistance element portion 1 is inserted into the case 4, and the resistance element portion 1 is immersed in the insulating material 5 injected in the previous process. Dry and cure under predetermined temperature conditions. When the resistance element portion 1 is inserted into the case 4, the resistance element portion 1 and the case 4
At the same time, the insulating material 5 is wrapped around the upper surface portion of the resistance element portion 1 by the clearance provided between the electrode element portions 1 and 2, and the electrode terminal portions 2 and 3 are installed so as to overlap the opening portion of the case 4. 1 is fixed.

A conventional resistor has been manufactured through the above steps.

[0013]

However, in the above-described conventional configuration, when the resistance element portion 1 is inserted into the case 4, the insulating material 5 is smoothly wound around the upper surface portion of the inserted resistance element portion 1. Since a clearance is provided between the inner surface of the case 4 and the width direction of the metal plate-shaped resistance element portion 1, when the resistance element portion 1 is inserted as shown in FIG. Adjustment of positioning such that the resistance element portion 1 is installed at the center cannot be performed, and as a result, the sealing position of the resistance element portion 1 may be shifted from the center of the case 4.

Even when the resistance element 1 is inserted into the center of the case 4, the insulation element 5 is not fixed to the case 4 before the insulation material 5 is dried and cured, so that the insulation material 5 is cured. In some cases, the enclosing position of the resistance element portion 1 may be shifted from the center of the case 4 due to the conveyance or vibration between the steps before the process.

In both cases, when the curing of the insulating material 5 is completed in a state where the resistance element portion 1 is shifted from the center position of the case 4, the resistance is set with respect to the center position of the case 4 in a completed state of the resistor. The element portion 1 is shifted from an appropriate position (center portion).

As a result, as shown in FIG. 10 (b), the resistance element portion 1 is displaced from the central portion of the case 4, that is, the electrode terminals 2 and 3 are soldered to the mounting board in a tilted state. In this case, the alignment of the electrode terminals 2 and 3 with respect to the land pattern 7 of the mounting board is adjusted by the self-alignment effect at the time of soldering, and as a result, the case 4 is shifted or tilted from the land pattern 7. There was a case.

Therefore, in the visual inspection after the mounting of the resistor and the visual inspection of the soldering by an image recognition device or the like, the contact with other peripheral components or the displacement from the land pattern occurs, so that the soldering work is reworked. In addition to the necessity, when the displacement of the case 4 is extremely large, the correction becomes impossible, and as a result, there is a problem that the yield at the time of mounting is deteriorated.

The present invention solves the above-mentioned conventional problems, and improves the workability of inserting the resistance element portion while maintaining the clearance in the width direction between the inner surface of the case and the resistance element portion when the resistance element portion is inserted into the case. It is an object of the present invention to provide a resistor that enables high-precision positioning of a resistance element portion without damage.

[0019]

In order to achieve the above object, a resistor according to the present invention comprises a resistor comprising a metal plate having an integral structure of a resistor element portion and an electrode terminal portion, and a resistor element portion of the resistor. A case made of an insulator that includes and has at least one opening surface; and an insulating material for sealing a resistance element portion of the resistor in the case, wherein the resistance element portion is provided on an inner surface of the case. According to this configuration, a notch portion for performing insertion positioning of the resistance element portion is provided, while maintaining a clearance in the width direction between the inner surface of the case and the resistance element portion when the resistance element portion is inserted into the case. This allows highly accurate positioning of the resistance element portion without impairing the insertion workability.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a resistor comprising a metal plate having an integral structure of a resistor element portion and an electrode terminal portion, including the resistor element portion of the resistor, and A case made of an insulator having at least one opening surface, and an insulating material for sealing the resistance element portion of the resistor in the case, wherein the insertion position of the resistance element portion is positioned on the inner surface of the case. According to this configuration, when the resistance element portion is sealed in the case, the notch portion provided on the inner surface of the case can perform high-precision positioning of the resistance element portion. It has an action.

According to a second aspect of the present invention, there is provided a resistor comprising a metal plate having an integral structure of a resistor element portion and an electrode terminal portion, and including the resistor element portion of the resistor and having at least one opening surface. A case made of an insulator, and an insulating material for sealing a resistance element portion of the resistor in the case, at least two or more for inserting and positioning the resistance element portion on an inner surface of the case. According to this configuration, when the resistance element portion is inserted into the case, at least two or more projections provided on the inner surface of the case can perform highly accurate positioning of the resistance element portion. It has the action of:

According to a third aspect of the present invention, there is provided a resistor comprising a metal plate in which a resistance element portion and an electrode terminal portion are integrally formed, and including the resistance element portion of the resistor and having at least one opening surface. A case made of an insulator; and an insulating material for sealing a resistance element portion of the resistor in the case, a part of a thickness of an opening surface of the case, a bottom direction from the opening surface of the case to a bottom surface. To provide a notch portion shallower than the thickness dimension of the resistance element portion for performing insertion positioning of the resistance element portion. According to this configuration, when inserting the resistance element portion into the case, A cutout portion provided in a part of the thickness of the opening surface from the opening surface of the case to the bottom surface direction and having a thickness smaller than the thickness of the resistance element portion has an effect of performing highly accurate positioning of the resistance element portion.

According to a fourth aspect of the present invention, there is provided a resistor having a resistor element portion and an electrode terminal portion formed of a metal plate having an integral structure, and including the resistor element portion of the resistor and having at least one opening surface. A case made of an insulator, comprising an insulating material for sealing a resistance element portion of the resistor in the case, a part of an outer surface of the case, from an opening surface of the case to a bottom surface direction, With a notch wider than the width of the resistance element part for performing insertion positioning of the resistance element part, according to this configuration, when inserting the resistance element part into the case, a part of the case outer surface part The cutout portion wider than the width of the resistance element portion provided from the opening surface of the case to the bottom surface has an effect that the resistance element portion can be positioned with high accuracy.

According to a fifth aspect of the present invention, there is provided a resistor comprising a metal plate having an integral structure of a resistor element portion and an electrode terminal portion, and including the resistor element portion of the resistor and having at least one opening surface. A case made of an insulator, comprising an insulating material for sealing the resistance element portion of the resistor in the case, a part of the inner bottom surface of the case, from the inner bottom surface of the case to the opening surface, According to this configuration, at least one projection is provided for performing insertion positioning of the resistance element portion. When the resistance element portion is inserted into the case,
At least one projection provided on an opening surface from the bottom surface of the case on a part of the bottom surface of the case has an effect that highly accurate positioning of the resistance element portion can be performed.

According to a sixth aspect of the present invention, there is provided a resistor comprising a metal plate in which a resistance element portion and an electrode terminal portion are integrally formed, and including at least one opening surface which includes the resistance element portion of the resistor. A case made of an insulator, and an insulating material for sealing a resistance element portion of the resistor in the case, at least a part of the resistor for inserting and positioning the resistance element portion. According to this configuration, when the resistance element portion is inserted into the case, the height of the resistance element portion is increased by at least two or more protrusions provided on a part of the resistor. This has the function of performing accurate positioning.

According to a seventh aspect of the present invention, both terminal portions of the resistor are exposed from an opening surface of a case made of an insulator having at least one opening surface, and furthermore, both exposed terminal portions of the resistor are exposed. It is bent from the opening surface to the side surface of the case, and according to this configuration, it is possible to check the formation state of the solder fillet when attached to the mounting substrate by soldering from the upper surface of the mounting substrate, and as a result, This has the effect of improving the accuracy of detection of soldering defects.

According to an eighth aspect of the present invention, the resistor includes at least either copper or nickel metal. According to this structure, the resistor includes at least one of copper and nickel. Has the effect that the solderability of the electrode portion of the resistor can be ensured.

According to a ninth aspect of the present invention, the resistance element portion and the electrode terminal portion are insulated so that the surface direction of the metal plate in the resistor formed of a metal plate having an integral structure is flush with the opening surface of the case. The resistor is sealed with a material, and according to this configuration, the surface of the case and the electrode terminal surface is less likely to be displaced in the Z direction.

[0029] The invention described in claim 10 is the case in which
According to this configuration, the heat generated when the resistor is energized can be efficiently radiated to the mounting substrate by the inclusion of alumina.
This has the effect that the temperature rise on the resistor surface can be suppressed.

According to an eleventh aspect of the present invention, the case is made of a non-combustible or flame-retardant resin. According to this structure, the resistor is formed by employing a case made of a non-combustible or flame-retardant resin. This has the function of suppressing the generation of smoke when an abnormal current is applied to the device.

According to a twelfth aspect of the present invention, the projecting portion of the case is configured such that a portion that contacts the resistor has at least two or more point contacts.
This has the effect that the resistance element can be easily inserted when inserted into the case.

According to a thirteenth aspect of the present invention, the protruding portion of the resistor is configured such that a portion that contacts the inner surface of the case has at least two or more point contacts. This has the effect that the part can be easily inserted when it is inserted into the case.

According to a fourteenth aspect of the present invention, a step of obtaining a resistor in which a resistor element portion and an electrode terminal portion whose dimensions and shape are adjusted to have a predetermined resistance value and an electrode terminal portion are integrated, and at least one opening surface is formed. Obtaining a case having a notch for performing insertion positioning of a resistance element portion on an inner surface thereof; anda step of obtaining a case inside the case such that a surface direction of the resistor is flush with an opening surface of the case. And a step of sealing the resistance element portion of the resistor with an insulating material in the case. According to this manufacturing method, the surface of the resistance element is Since the resistance element part of the resistor is inserted into the case so that the direction is the same as the direction of the opening surface of the case, if the insulating material is previously injected into the case from the opening surface of the case But isolated outside the case Charge is not able to flow out, a result, the adhesion of the insulating material to the outside of the case is eliminated,
This has the function of maintaining the automatic mountability and solderability on the mounting board.

According to a fifteenth aspect of the present invention, a step of obtaining a resistor having at least two protrusions for inserting and positioning a resistor element portion on an end face in a width direction of a metal plate; Obtaining a resistor having an integral structure of a resistor element portion and an electrode terminal portion whose size and shape have been adjusted to have the following resistance value; obtaining a case having at least one opening surface; Inserting a resistor element portion of a resistor into the case such that the resistor element portion is flush with an opening surface of the case, and sealing the resistor element portion of the resistor with an insulating material in the case. With
According to this manufacturing method, the resistor element portion of the resistor is inserted into the case so that the surface direction of the resistor is flush with the opening surface of the case. Even if the insulating material has been injected beforehand, the insulating material will not flow out of the case,
As a result, since the insulating material does not adhere to the outside of the case, it has an effect of maintaining the automatic mounting property and the solderability on the mounting board.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1A is a perspective view of the resistor according to Embodiment 1 of the present invention, FIG. 1B is a bottom view of the resistor, and FIG. 1C is a side sectional view of the resistor.

1 (a), 1 (b) and 1 (c), reference numeral 11 denotes a resistor composed of a metal plate having a resistor element portion 12 and first and second electrode terminal portions 13 and 14 integrally formed. The resistance element portion 12 of 11 is made of a plate-like alloy containing at least one of copper and nickel, and has a low resistance value by using a metal component having low specific resistance.
The first and second electrode terminal portions 13 and 14 are located at both ends of the resistance element portion 12, and the first and second electrode terminal portions 13 and 14 and the resistance element portion 12 are the same. It is formed of an integral structure made of metal. 15 is a resistance element portion 1
The case 15 is a rectangular parallelepiped ceramic case, and the case 15 has at least one opening surface. 1
Reference numeral 6 denotes a cement-like insulating material containing alumina powder or silica powder for sealing the resistance element portion 12 in the case 15. In addition, between the case 15 and the resistance element section 12, a path for the insulating material 16 previously injected into the case 15 when the resistance element section 12 is inserted to go around the upper surface of the resistance element section 12. A clearance is provided. Reference numeral 17 denotes a notch formed on the side surface of the inner surface of the case 15 for performing insertion positioning of the resistance element portion 12. The notch 17 is notch wider than the width dimension of the resistance element portion 12. It is.

Next, a description will be given of a method of manufacturing the resistor having the above-described structure according to the first embodiment of the present invention with reference to the drawings.

FIGS. 2A to 2E are process diagrams showing a method for manufacturing a resistor according to the first embodiment of the present invention.

First, as shown in FIG. 2A, a ceramic case 15 having one opening surface and two notches 17 on the inner side surface is manufactured.

By using a material containing 20 to 96% of alumina for the ceramic case 15, heat generated when the resistor is turned on can be efficiently radiated to the printed circuit board as a mounting board. It is possible to suppress a temperature rise on the surface of the resistor.

Next, as shown in FIG. 2B, a resistor 11 having a predetermined resistance value is formed by a plate-shaped metal plate made of an alloy containing either copper or nickel.

By making the metal composition of the resistor 11 be a metal composition containing at least one of copper and nickel, the first and second electrode terminal portions 13 formed on both ends of the resistor 11 are formed. 14 can be minimized by oxidation, so that the first,
The solderability of the second electrode terminal portions 13 and 14 can be ensured.

Next, as shown in FIG.
Is bent to conform to the inner surface and outer dimensions of the case 15 to form the resistance element portion 12, the first electrode terminal portion 13, and the second electrode terminal portion 14.

Next, as shown in FIG.
A suitable amount of a cement-like insulating material 16 containing alumina and silica powder is injected into the case 15 from the opening surface of the above.

Next, as shown in FIG.
The resistance element portion 1 which has been processed so that the surface direction of the resistor 11 is flush with the opening surface of the case 15 from the opening surface of FIG.
2 is inserted into the case 15.

When the resistance element portion 12 is inserted, the notch portion 17 provided on a side surface of the inner surface of the case 15 inserts the resistance element portion 12 while positioning the resistance element portion 12 and simultaneously inserts the resistance into the case 15. The insulating material 16 injected beforehand is wrapped around the upper surface of the resistance element section 12 through a clearance provided between the element section 12 and the element section 12.

Finally, the resistive element portion 12 is sealed in the case 15 by holding the resist at 130 ° C. for one hour to dry and cure the insulating material 16.

In the method of manufacturing the resistor according to the first embodiment of the present invention, the opening of the case 15
The resistance element portion 12 of the resistor 11 is placed on the case 1 so that the surface direction of the resistor 11 is flush with the opening surface of the case 15.
5, the insulating material 16 does not flow out of the case 15 even if the insulating material 16 has been injected into the case 15 from the opening surface of the case 15 in advance. Since there is no adhesion of the insulating material 16 to the outside of the semiconductor device 15, there is an effect that the automatic mounting property on the mounting board and the solderability are maintained.

Further, as shown in FIG.
When the resistance element portion 12 of the resistor 11 is inserted into the case 15 from the opening surface of the resistor 5, both terminal portions of the resistor 11, that is, the first and second electrode terminal portions 13 and 14 are connected to the opening surface of the case 15. Since the exposed first and second electrode terminal portions 13 and 14 are bent from the opening surface of the case 15 to the outer surface thereof, when the resistor is mounted on the mounting board by soldering, The state of fillet formation can be checked from the top surface of the mounting board, and as a result, the state of soldering can be accurately grasped even when visual inspection of soldering or visual inspection of image recognition using a camera is used. Therefore, it is possible to improve the accuracy of detecting a soldering defect.

Next, a description will be given of an example in which the resistor according to the first embodiment of the present invention and a conventional resistor are compared with each other when the resistors are mounted on a mounting board.

FIG. 3 shows the state of the resistor according to the first embodiment of the present invention and the conventional resistor measured when the case is mounted on a general mounting board land pattern, and after mounting the resistor. Are schematically shown in FIGS. 3A and 3B, respectively.

First, FIG. 3 according to the first embodiment of the present invention
In the resistor of (a), since the notch 17 is provided on the inner surface of the case 15, even when the resistor 12 is inserted, the width of the resistor 17 is determined based on the width of the notch 17. Are spaced apart from each other, and the degree of freedom of the displacement of the resistance element portion 12 is limited. Therefore, the inclination of the resistance element portion 12 from the case 15 can be suppressed. As a result, the effect of suppressing the displacement and inclination of the case 15 from the land pattern 18 provided on the mounting board surface was recognized.

However, in the case of the conventional resistor shown in FIG. 3B, the distance between the resistance element portion 12 and the inner surface of the case 15 increases, so that when the resistance element portion 12 is inserted, Positioning is difficult, and as a result, the displacement of the resistance element portion 12 tends to occur, and a large displacement of the case 15 with respect to the land pattern 18 occurs.

Next, the effect of improving the degree of inclination of the case of the resistor according to the first embodiment of the present invention will be described with reference to specific dimensions.

As a result of measuring the shift angle 19 of the resistance element portion 12 with respect to the center value of the land pattern 18 in FIG. 3B, the shift in the resistor according to the first embodiment of the present invention is at most 4 degrees. In contrast to the angle, it was confirmed that the conventional resistor was inclined at a maximum of 23 degrees.

As described above, the angle of deviation of the case from the land pattern indicating the degree of inclination of the case between the resistor in the first embodiment of the present invention and the conventional resistor is the same as that in the first embodiment of the present invention. The deviation angle was reduced to about 1/6 of the example.

Although the first embodiment of the present invention has been described with reference to the case where the cutout portion 17 for inserting and positioning the resistance element portion 12 is formed on the side surface of the inner surface of the case 15, FIGS. Also in the second, third, and fourth embodiments of the present invention shown in FIG. 6, highly accurate positioning at the time of inserting the resistance element portion 12 can be achieved, and the same effect as in the first embodiment of the present invention can be obtained. Was done.

Embodiment 2 of the present invention shown in FIG. 4 is characterized in that at least two or more projections 20 for inserting and positioning the resistance element portion 12 are provided on the side surface of the inner surface of the case 15. In FIG. 4, the insertion of the resistance element portion 12 is performed by the projection 20 when the resistance element portion 12 is inserted.

In the third embodiment of the present invention shown in FIGS. 5 (a) and 5 (b), the resistance element portion 1 is formed on a part of the thickness of the opening of the case 15 from the opening of the case 15 to the bottom.
5A and 5B, a notch 21 shallower than the thickness of the resistance element portion 12 for performing the insertion positioning of the resistance element portion 12 is provided.
The insertion positioning of the resistance element portion 12 is performed by the notch portion 21 at the time of insertion.

In the fourth embodiment of the present invention shown in FIGS. 6A and 6B, the insertion and positioning of the resistance element portion 12 is performed on a part of the outer surface of the case 15 from the opening surface of the case 15 to the bottom surface. 6 is provided with a cutout portion 22 wider than the width of the resistance element portion 12 for performing the operation.
3A and 3B, the insertion position of the resistance element portion 12 is determined by the notch 22 when the resistance element portion 12 is inserted.

FIG. 7A is a bottom view of the resistor according to the fifth embodiment of the present invention, and FIG. 7B is a side view of the resistor.

7 (a) and 7 (b), reference numeral 31 denotes a resistor composed of a metal plate having a resistor element portion 32 and first and second electrode terminal portions 33a and 33b formed integrally. The resistance element portion 32 is made of a plate-like alloy containing at least one of copper and nickel.
The first and second electrode terminal portions 33a and 33b are located at both ends of the resistance element portion 32, and the first and second electrode terminal portions 33a and 33b are connected to the resistance element portion. Reference numeral 32 denotes an integrated structure made of the same metal. Reference numeral 34 denotes at least two projections formed on the widthwise end face of the resistance element portion 32. The projections 34 position the resistance element portion 32 for insertion. Reference numeral 35 denotes a rectangular parallelepiped ceramic case enclosing the resistance element portion 32. The case 35 has at least one opening surface. Reference numeral 36 denotes a cement-like insulating material containing alumina powder or silica powder for sealing the resistance element portion 32 in the case 35.

The method of manufacturing the resistor according to the fifth embodiment of the present invention configured as described above is basically the same as the method of manufacturing the resistor according to the first embodiment of the present invention shown in FIGS. 2 (a) to 2 (e). In order to position the resistor, the notch 17 formed on the side surface of the inner surface of the case 15 as shown in the first embodiment of the present invention is used, or as shown in the fifth embodiment of the present invention. The only difference is whether to use a point contact projection 34 provided on the widthwise end face of the resistance element portion 32 of the resistor 31.

In the above-described fifth embodiment of the present invention, similarly to the first embodiment of the present invention, the positioning accuracy when inserting the resistance element portion 32 can be improved.

In the second embodiment of the present invention, the case in which at least two or more protrusions 20 for inserting and positioning the resistance element portion 12 are provided on the side surface of the inner surface of the case 15 has been described. However, at least a part of the inner bottom surface of the case 15 is provided from the inner bottom surface of the case 15 to the opening surface, and at least one projection for positioning the insertion of the resistance element portion 12 is provided. 12 according to the second embodiment of the present invention.
The same operation and effect as described above can be obtained.

In the first to fifth embodiments of the present invention, the case where the case 15 or the case 35 is made of ceramic has been described. However, the case 15 or the case 35 is made of non-combustible or flame-retardant resin. In this case, the use of a case made of a non-combustible or non-combustible resin can suppress the generation of smoke when an abnormal current is applied to the resistor.

[0067]

As described above, the resistor according to the present invention comprises a resistor made of a metal plate having an integral structure of a resistor element and an electrode terminal, a resistor including the resistor element of the resistor, and at least one resistor. A case made of an insulator having an opening surface, and an insulating material for sealing the resistance element portion of the resistor in the case, for inserting and positioning the resistance element portion on the inner surface of the case. According to this configuration, when inserting the resistance element portion into the case, the notch portion provided on the inner surface of the case enables highly accurate positioning of the resistance element portion. Since the deviation of the resistance element portion from the center line with respect to the case at the time when the production of the resistor is completed can be suppressed, defective appearance of the resistor can be reduced and the yield can be improved.

Further, even when the resistor is mounted on the mounting board, the displacement of the resistor from the case can be suppressed, so that the mounting position accuracy on the land pattern surface is improved. Since it is easy to secure the interval between the components to be set, the safety of the set is improved, and further, there is an effect that it is possible to cope with high-density mounting.

[Brief description of the drawings]

FIG. 1A is a perspective view of a resistor according to a first embodiment of the present invention. FIG. 1B is a bottom view of the resistor. FIG. 1C is a sectional side view of the resistor.

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

FIG. 3A is a schematic diagram showing a state of mounting a resistor on a mounting board according to the first embodiment of the present invention; FIG. 3B is a schematic diagram showing a state of mounting a conventional resistor on a mounting board;

FIG. 4 is a bottom view of the resistor according to the second embodiment of the present invention.

5A is a bottom view of the resistor according to the third embodiment of the present invention. FIG. 5B is a side view of the resistor.

FIG. 6A is a bottom view of the resistor according to the fourth embodiment of the present invention. FIG. 6B is a side view of the resistor.

FIG. 7A is a bottom view of the resistor according to the fifth embodiment of the present invention. FIG. 7B is a side view of the resistor.

8A is a perspective view of a conventional resistor, FIG. 8B is a bottom view of the resistor, and FIG. 8C is a sectional side view of the resistor.

FIG. 9 is a process chart showing a conventional method for manufacturing a resistor.

10A is a bottom view showing a state in which a resistance element portion of a conventional resistor is shifted from the center of a case. FIG. 10B is a schematic view showing a state where the resistor is mounted on a mounting board.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Resistor 12 Resistance element part 13 1st electrode terminal part 14 2nd electrode terminal part 15 Case 16 Insulating material 17 Notch part 20 Two or more protrusion parts 21 Notch part 22 Notch part 31 Resistor 32 Resistance Element part 33a First electrode terminal part 33b Second electrode terminal part 34 Projection 35 Case 36 Insulating material

Claims (15)

[Claims] 1. A resistor comprising a metal plate having an integral structure with a resistor element portion and an electrode terminal portion; and a case comprising an insulator containing the resistor element portion of the resistor and having at least one opening surface; An insulating material for sealing the resistance element portion of the resistor in the case; and a cutout portion for inserting and positioning the resistance element portion on an inner surface of the case. Resistor. 2. A case in which a resistance element portion and an electrode terminal portion are formed of a metal plate having an integral structure, a case including a resistance element portion of the resistance body and an insulator having at least one opening surface, An insulating material for sealing the resistance element portion of the resistor in the case, and at least two protrusions for inserting and positioning the resistance element portion on the inner surface of the case. A resistor characterized by the following: 3. A case in which a resistance element portion and an electrode terminal portion are formed of a metal plate having an integral structure, a case including a resistance element portion of the resistance body and formed of an insulator having at least one opening surface; An insulating material for sealing the resistance element portion of the resistor in the case, a part of the thickness of the opening surface of the case, from the opening surface of the case to the bottom surface, A resistor provided with a notch portion shallower than a thickness dimension of a resistance element portion for performing insertion positioning. 4. A case in which a resistance element portion and an electrode terminal portion are formed of a metal plate having an integral structure, and a case which includes a resistance element portion of the resistance body and is formed of an insulator having at least one opening surface. An insulating material for sealing the resistance element portion of the resistor in the case, and a part of an outer surface portion of the case, from an opening surface of the case to a bottom surface, the insertion positioning of the resistance element portion. A resistor provided with a cutout portion wider than a width of a resistance element portion for performing the operation. 5. A resistance element comprising a metal plate having an integral structure with a resistance element portion and an electrode terminal portion; and a case including an insulation material including the resistance element portion of the resistance member and having at least one opening surface; An insulating material for sealing the resistance element portion of the resistor in the case, and a part of the inner bottom surface of the case, from the inner bottom surface of the case to the opening surface, the insertion positioning of the resistance element portion. A resistor provided with at least one projection for performing the operation. 6. A resistor comprising a metal plate having an integral structure with a resistor element portion and an electrode terminal portion; and a case comprising an insulator including the resistor element portion of the resistor and having at least one opening surface; An insulating material for sealing the resistance element portion of the resistor in the case, and at least two projections for inserting and positioning the resistance element portion on a part of the resistor. A resistor characterized by being provided. 7. Both ends of the resistor are exposed from an opening of a case made of an insulator having at least one opening, and both ends of the exposed resistor are outside the opening of the case. The resistor according to any one of claims 1 to 6, which is bent over a side surface. 8. The resistor according to claim 1, wherein the resistor contains at least one of copper and nickel. 9. The resistor is sealed with an insulating material so that the surface direction of the metal plate in the resistor made of a metal plate having an integral structure with the resistance element portion and the electrode terminal portion is flush with the opening surface of the case. The resistor according to any one of claims 1 to 6, wherein 10. The resistor according to claim 1, wherein the case contains 20 to 96% of alumina. 11. The resistor according to claim 1, wherein the case is made of a nonflammable or flame-retardant resin. 12. The resistor according to claim 2, wherein the projecting portion of the case is configured such that a portion in contact with the resistor makes at least two or more point contacts. 13. The resistor according to claim 6, wherein the projecting portion of the resistor is configured such that a portion that contacts the inner surface of the case has at least two or more point contacts. 14. A step of obtaining a resistor in which a resistor element portion and an electrode terminal portion whose dimensions and shape are adjusted to have a predetermined resistance value have an integrated structure, a process having at least one opening surface, and a resistor on an inner surface. A step of obtaining a case having a notch for performing insertion positioning of the element portion; And a step of sealing the resistance element portion of the resistor in the case with an insulating material. 15. A step of obtaining a resistor having at least two projections for inserting and positioning a resistor element portion on an end face in a width direction of a metal plate, and a step of obtaining a resistor having a predetermined resistance value. A step of obtaining a resistor in which the resistance element portion and the electrode terminal portion whose dimensions and shape are adjusted are integrated, a step of obtaining a case having at least one opening surface, and the plane direction of the resistor is relative to the opening surface of the case. Inserting a resistance element portion of a resistor into the case so as to be flush with the case, and sealing the resistance element portion of the resistor with an insulating material in the case. Method of manufacturing resistors.