JP6694038B2 - Method for manufacturing shunt resistance element - Google Patents

Description

  The present invention relates to a shunt resistance element and a method for manufacturing the same.

  2. Description of the Related Art In recent years, the number of mounted ECUs (Electronic Control Units) for controlling engines, air conditioners and the like has increased with the progress of electric equipment technology for automobiles. Therefore, miniaturization of the ECU is required. Since there is a limit to miniaturization when a planar mounting structure is used, a three-dimensional mounting structure has been adopted.

  In the shunt resistor, there is a method in which the electrical characteristics are detected by a pseudo Kelvin terminal which is solder-mounted on the PCB and is formed on the wiring pattern of the PCB. On the other hand, a method has been studied for realizing the miniaturization of the ECU by solder mounting on a PCB and wire bonding to the terminal upper surface of the shunt resistor to detect the electrical characteristics (for example, Patent Document 1). 1).

JP 2012-233706 A

  By the way, the board wiring (land) on which the shunt resistor is mounted may have a step in order to realize miniaturization. In order to accommodate such mounting on a land that is not on the same plane, for example, it is necessary to form the two terminals of the shunt resistor that are bonded to the land so as to match the steps of the land.

  In such a case, since the two terminals have different structures, it is necessary to make the mounting direction of the shunt resistor dependent on the terminals, but since the shunt resistor is small, the difference in the three-dimensional structure of the terminals (step difference) ) It is not easy to confirm the direction only.

  Further, in current detection, it is required that the characteristics of the shunt resistor have higher accuracy.

  An object of the present invention is to provide a technique that facilitates confirmation of the direction of terminals in a resistance element such as a shunt resistor.

  According to one aspect of the present invention, there is provided a resistance element including a main body portion and first and second terminal portions provided at both ends of the main body portion, the resistance element being provided on at least one side portion of the main body portion. There is provided a resistance element having a characteristic shape such as a protrusion.

  The projecting portion serves as a jumper element or a resistance element in which the directionality of the terminal portion (for example, the longitudinal direction) can be identified.

  A first protrusion and a second protrusion are provided on both sides of the body, respectively, and the first protrusion and the second protrusion have different (characteristic) shapes.

  By making the characteristic shapes of the first protrusion and the second protrusion different, for example, when viewed from the upper surface, it is possible to improve the directional discriminating power of the terminal portion (longitudinal direction).

  Furthermore, it is characterized by having a coating material for coating the metal material of the main body.

  One end of either the first protrusion or the second protrusion is not covered with the covering material.

  According to another aspect of the present invention, there is provided a main body part, first and second terminal parts provided at both ends of the main body part, and a resistance element having a protruding part on at least one side part of the main body part. A manufacturing method, wherein a sheet-shaped or hoop-shaped plate-shaped body made of a metal material is prepared, holes for defining an outer peripheral shape of the terminal portion are formed in the plate-shaped body, and the main body portion is formed. A step of forming a first connecting part connected to the plate-like body at a side part of the body, and a step of forming a protruding part on a side part of the main body by cutting at the first connecting part. A method of manufacturing a featured resistive element is provided.

  Here, the method is characterized by including a step of adjusting a resistance value of the main body portion by a protrusion amount of the protrusion portion depending on a cutting position in the first connecting portion.

  A second connecting portion may be formed on the other side portion of the main body portion, and a step of cutting at the second connecting portion may be included.

  Here, at least one hole is previously formed in the second connecting portion, and by cutting the second connecting portion at the hole forming portion, another side portion of the main body portion is formed. It is characterized in that a plurality of protrusions are formed.

  According to the present invention, it is possible to provide a technique that facilitates confirmation of the direction in a resistance element such as a shunt resistor.

It is a figure which shows a mode that the shunt resistor is mounted on the board | substrate wiring as an example of the resistance element by embodiment of this invention, and current is monitored. FIG. 2 is a side sectional view of the shunt resistor. FIG. 3 is a perspective view of the shunt resistor. It is a figure which shows one structural example of the shunt resistor by the 1st Embodiment of this invention. It is a figure which shows one structural example of the shunt resistor by the 2nd Embodiment of this invention. It is a figure which shows the outline of the process of manufacturing the shunt resistor by 2nd Embodiment as an example of a manufacturing method with one drawing, and the diagram shown from T1 to T9 has shown the structure after a different process. (A)-(e) is a figure which shows the process of manufacturing a shunt resistor. It is a figure which shows the modification which changed the protrusion part of a shunt resistor. At T8 of FIG. 6A, the dimension of the protruding portion A is changed by cutting at any of the positions P1 and P2 that are different in the protruding direction, and the resistance of the main body of the shunt resistor is adjusted. Is. FIG. 6 is a diagram showing a state in which a sheet of Cu or the like is coated with Ni—P or the like by electroless plating or the like, and then the resistor is cut off at a protrusion. It is sectional drawing which followed the Ia-Ib line of FIG. It is sectional drawing which followed the Ic-Id line of FIG. It is a figure which shows a mode that it cut | disconnects in the direction different from the cutting direction shown to FIG. 6A, B, and forms a shunt resistor.

  Hereinafter, a resistance element according to an embodiment of the present invention will be described in detail with reference to the drawings. A shunt resistor is a low resistor that bends a plate-shaped or ribbon-shaped metal material and is used as a resistor, and has electrodes on both ends.It has good heat dissipation and a large current capacity. Widely used for resistors and the like. As this electrode structure, a plating electrode is generally formed on the above-mentioned metal material.

  FIG. 1 is a diagram showing a state in which a shunt resistor is mounted on a substrate wiring as an example of a resistance element according to the present embodiment to monitor a current, and FIG. 2 is a side sectional view of the shunt resistor. .. FIG. 3 is a perspective view of the shunt resistor 1. As shown in FIGS. 1 and 2, the shunt resistor 1 has a main body portion 1a and terminal portions A and B located at both ends in the longitudinal direction thereof. As shown in FIG. 2, the terminal portion A of the shunt resistor 1 is on one side of the board wiring 3, the terminal portion B of the shunt resistor 1 is on the other side of the board wiring 3, and the back surface thereof is the top surface of the board wiring 3 ( The terminals A and B are arranged so as to be bonded to a contact surface (such as a wire, which comes into contact with a current wiring), and the terminal portion A and the terminal portion B are connected to the current monitoring IC 5 by a bonding wire 7 or the like. Here, the lower surface of the terminal portion A and the lower surface of the terminal portion B are different in position, for example, by a step difference t of the board wiring 3 when the main body portion 1a is positioned horizontally. That is, the sectional structure has directionality.

  As described above, since the shunt resistor 1 has a directionality with respect to the positions of the terminal portion A and the terminal portion B, when the shunt resistor 1 is to be mounted as shown in FIG. It is important to know the direction of.

  Therefore, as shown in FIG. 3, in the shunt resistor 1 according to the present embodiment, in order to easily distinguish between the terminal portion A and the terminal portion B, the direction connecting the terminal portion A and the terminal portion B of the main body portion 1a A protruding portion C protruding from at least one side surface of the main body portion 1a is provided in the intersecting direction (the orthogonal direction in the drawing). That is, the protrusion C is provided in the lateral direction. The protrusion D will be described later.

  Here, the direction of the terminal portion is known by providing the protruding portion C, but if the shapes of the main body portion 1a are made different, the directions of the terminal portion A and the terminal portion B can be discriminated from each other. There is also a method of providing the like, and if the directionality can be known from the shape, the method therefor is not limited. It does not have to be a protruding portion as long as it is a characteristic shape that is a characteristic shape. In the following, a case where a protrusion is provided as a structure for identification will be described as an example.

  The longitudinal direction and the lateral direction are terms used for convenience, and the longitudinal direction is a direction in which a current flows when a resistor is used, and is not limited by dimensions.

  FIG. 4 is a diagram showing an example of the configuration of the shunt resistor according to the first embodiment of the present invention seen from above. The shunt resistor 1 includes a main body 1a made of a metal material, terminals A and B at both ends of the main body 1a, and a protrusion C on one side of the main body. As a result, as shown in FIG. 2, even if the one terminal portion A and the other terminal portion B have different shapes (structures) and have directivity, the protruding portion C from the main body portion 1a is not affected. The direction of the terminals A and B can be identified by the protruding direction.

  As described above, according to the shunt resistor according to the present embodiment, it is possible to provide the protruding portion on the main body portion 1a and identify the directions of the terminal portions A and B based on the protruding direction. The mounting can be performed by determining the mounting direction on the board wiring with a simple structure.

  Next, a second embodiment of the present invention will be described.

  FIG. 5: is a figure which shows one structural example of the shunt resistor by the 2nd Embodiment of this invention. The shunt resistor 1 includes a main body 1a made of a metal material, terminals A and B at both ends of the main body 1a, a protrusion C on one side of the main body 1a, and a protrusion C from the other side. And a protrusion D having a protrusion shape different from the above. As a result, as shown in FIG. 2, even if the one terminal portion A and the other terminal portion B have different shapes (structures) and have directivity, the protruding portion C and the protruding portion D are The directions of the terminal portions A and B can be identified based on the difference in the protruding shape.

  Next, a method of manufacturing the shunt resistor according to each of the above embodiments will be described. First, as the plate-shaped (strip-shaped) resistance material, a metal plate material of Cu, Cu-Ni system, Cu-Mn system, or the like is used, or a Ni-P coating film is formed on the plate material by electroless plating. Can be used.

  FIG. 6A is a diagram showing an outline of a step of manufacturing the shunt resistor according to the second embodiment as an example of the manufacturing method in one drawing, and the drawings shown from T1 to T9 show a planar structure in different steps. ing. On the other hand, FIG. 6B is a diagram showing the structure in the order of manufacturing steps. First, as shown in T1-T2 of FIG. 6A and FIG. 6B (a), with respect to the sheet 41 which is a hoop-shaped metal material, a hole 31a for later forming the protrusion D (D1, D2) is formed by punching or the like. Form. 6A and the like, a hoop-shaped or ribbon-shaped metal material that is a long plate is used as the sheet 41, but a flat plate that can be manufactured by arranging a large number of resistors in the vertical and horizontal directions is used. A sheet-shaped metal material may be used. Next, as shown in T2-T3 of FIG. 6A and FIG. 6B (b), the sheet (plate-like body) 41 is provided with a first hole 33a for forming the outer edge of the terminal portions A and B in the longitudinal direction. , A plurality of them are formed in the longitudinal direction. Thereby, the end faces of the terminal portions A and B of one shunt resistor can be defined.

Next, as shown in T4-T5 of FIG. 6A and FIG. 6B (c), the lateral sides of the terminal portions A and B of the shunt resistor 1 are demarcated, and a protruding portion is provided on one of the main body portion 1a. A plurality of second holes 35a for forming are formed in the longitudinal direction. Next, as shown in T6 and T7 of FIG. 6A, the main body portion 1a is processed into a shape in which the main body portion 1a is raised from the terminal portions A and B by two press processings (processing 1, processing 2), and The terminal portions A and B are formed, and the terminal portion A is processed so as to have a step higher than the terminal portion B by a step t, and the height of the terminal portions A and B is increased as shown in FIG. To make a difference. In FIG. 6A, upper and lower product rows are formed, and in the upper row, the right side is the terminal portion A (having a high step) and the left side is the terminal portion B (step lower than the terminal portion A). In the lower rows, the left side is the terminal portion A and the right side is the terminal portion B, respectively.
First and second connecting portions (first connecting portion 37a and second connecting portion 37b in FIG. 6B (c)) that are connected to the seat 41 are formed on both side surfaces of the main body portion 1a.

  Next, as shown in T8 of FIG. 6A and FIG. 6B (d), the protrusion C is formed by the press P or the like while adjusting the protrusion amount of the protrusion C. Although a plurality of presses P are pressed in FIG. 6B (d), they may be pressed individually as shown at T8 in FIG. 6A. That is, the first connecting portion 37a on the outer side in the lateral direction of the main body portion 1a is cut to expose the end face, and the lateral side of the second hole 35a is opened along with the lateral direction of the plate-like body 41. The outer edge in the direction is separated from the plate-like body 41. Then, as shown in T9 of FIG. 6A and FIG. 6B (e), it is possible to obtain a structure in which only the protrusion D side of the shunt resistor 1 is connected to the seat inner side (main body) 45. Here, since the protrusion D is connected to the seat inner side (main body) 45 at two second connecting portions 37b, the shunt resistor and the seat inner side (main body) 45 are connected to each other at the second connecting portion 37b. When cut, the protrusion D is formed. The number of protrusions D can be adjusted by the number of holes 31a. Although the hole 31a is formed substantially at the center of the second connecting portion 37b, it is also possible to discriminate the directionality by biasing the formation position.

  That is, the end surface of the main body portion 1a in the lateral direction is exposed by cutting, and the inside of the sheet, which is the inner edge portion of the plate-like body 41 in the lateral direction, together with the opening area of the second hole 35a in the lateral direction. The (main body) 45 can be separated from the plate-like body 41.

  In addition, as illustrated in FIG. 7, the position and the number of the protrusions of the shunt resistor can be arbitrarily changed.

  As shown in FIG. 8, in T8 of FIG. 6A, in the cutting step for forming the protrusion C, the protrusion is formed by cutting the position P1 and the position P2 at different positions in the protrusion direction of the protrusion C. Since the size of the portion C can be changed, the resistance of the main body portion 1a of the shunt resistor can be adjusted. Therefore, it is possible to manufacture two types of resistors having different resistance values, the resistor cut at the position P1 and the resistor cut at the position P2, from the same sheet 41. Alternatively, the resistance value between the terminal portions A and B may be measured before cutting, and the cutting position of the first connecting portion 37a forming the protrusion C may be determined according to the obtained value. In this case, the rate of change of the resistance value with respect to the movement of the cutting position may be measured in advance. Alternatively, the resistance value of a resistor that has been divided into individual pieces from the same sheet may be measured, and the cutting position of the first connection portion 37a that has not been cut may be determined according to the resistance value. The cutting position of the second connecting portion 37b forming the protrusion D may be adjusted, or the cutting positions of both the connecting portions 37a and 37b may be adjusted.

  After the step T9 in FIG. 6A is completed, when the sheet 45 made of Cu or the like is coated with Ni-P or the like on the entire surface by electroless plating as shown in FIG. As shown in the sectional view along the line), the shunt resistor 1 covered with the metal film 1x such as Ni-P can be produced. Since the protrusion D forms a metal coating in a state of being connected to the sheet inner side (main body) 45, the cross section taken along the line ic-Id of FIG. 9 after cutting shows the protrusion D as shown in FIG. Has a structure in which the end portion of is not covered with the metal film 1x. However, since the terminal portions A and B form the metal film in a state of being separated from the sheet inner side (main body) 45, the terminal portions A and B are covered with the metal film 1x. Therefore, it is possible to form the metal film 1x on the mounting portion and the connecting portion of the bonding wire and perform plating in a sheet state. In this way, a plurality of shunt resistors can be collectively plated before cutting, which simplifies the process. The metal film 1x may be formed by electrolytically plating a film of Ni or the like.

  As shown in FIG. 6A, at least one hole is previously formed at a position that is longitudinally connected to the second opening region of the sheet inner side (main body) 45 in the longitudinal direction forming the second hole 35a paired in the lateral direction. By forming 31a in advance, when the shunt resistor 1 is separated from the inner edge portion in the short side direction, the number of the protrusion portions D on the side portions in the short side direction of the protrusion portions of the main body portion 1a can be adjusted. ..

  Further, depending on the processing shape of the plate-like body 41 in the longitudinal direction between the second holes 35a forming a pair in the lateral direction, it is possible to identify the projecting shape of the lateral side of the projecting portion of the main body 1a. Thus, for example, when one hole 31a is provided between the inner second holes 35a as shown in FIGS. 6B to 6C, the number of protrusions is as shown in FIG. 7B. Can be 1 on the one hand and 2 on the other hand.

  As described above, with the manufacturing method according to the present embodiment, it is possible to easily identify the direction of the shunt resistor having two terminal portions when viewed from above.

  The arrangement of the first and second protrusions in FIG. 7 may be reversed and the second protrusion may be cut first.

  Next, a third embodiment of the present invention will be described with reference to the drawings. FIG. 12 is a diagram showing a manner of forming a shunt resistor by cutting in a direction different from the cutting direction shown in FIG. 6A. In the sheet 41, two facing U-shaped holes 61 defining the terminal portion and a U-shaped front end hole 63 provided therebetween are formed, and the sheet P is cut by a press P. Then, the shunt resistor 1 (hatched portion) having the same form as the first and second embodiments can be created.

  As described above, according to each of the embodiments of the present invention, in the shunt resistor 1 having the terminal portions A and B at both ends of the main body portion 1a, the protrusion from the main body portion 1a so that the direction can be identified. The part is formed on at least one side. Thus, even when the heights of the three-dimensional terminal portions that are downsized are made different, the installation direction can be correct and the process can be facilitated. Further, since the resistance value can be adjusted by the size of the protruding portion, it is possible to manufacture a highly accurate resistor.

  In the above-described embodiment, the configurations and the like illustrated in the accompanying drawings are not limited to these, and can be appropriately changed within the range where the effects of the present invention are exhibited. Other than the above, the present invention can be appropriately modified and implemented without departing from the scope of the object of the present invention.

  Further, each constituent element of the present invention can be arbitrarily selected, and an invention having a selected configuration is also included in the present invention.

  The present invention can be used for resistors.

DESCRIPTION OF SYMBOLS 1 ... Shunt resistor, 1a ... Main body part, A, B ... Terminal part, C, D ... Projection part, 3 ... Board wiring, 5 ... Current monitoring IC, 7 ... Wire, 33a ... First hole, 35a ... 2 holes, 41 ... plate-shaped body.

Claims (1)

A method for manufacturing a shunt resistance element, comprising: a main body portion; and first and second terminal portions provided at both ends of the main body portion.
Prepare a sheet-shaped or hoop-shaped plate made of metal material,
Forming a hole for defining the outer peripheral shape of the terminal portion in the plate-like body, and forming a first connecting portion connected to the plate-like body at a side portion of the main body portion;
A step of forming a metal film on the plate-like body,
And a step of cutting at the first connecting portion.

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