JP5039867B1 - Resistor and manufacturing method of resistor - Google Patents

Abstract

Provided are a resistor and a method for manufacturing the resistor, in which a resistance value can be set to a desired value and fine adjustment after processing is not required. The resistor 1 formed by processing a long plate-shaped metal resistor has a first width L1 so that the central portion on the back surface side where the resistor contacts the substrate is orthogonal to the longitudinal direction of the resistor. The groove portion 2 processed into the groove of the first thickness d1, the pair of electrode portions 3, 3 formed at both ends of the groove portion 2, and the opposite side surfaces adjacent to the groove portion 2 are wider than the first width L1. A pair of cutout portions 4 and 4 cut out at the second width L2 is provided.
[Selection] Figure 1

Description

  The present invention relates to a resistor formed by processing a metal resistor and a method for manufacturing the resistor.

  Conventionally, for this type of metal resistor, a narrow central portion is formed between both ends of the resistor so as to form an H shape in plan view, and the same shape is formed at both ends of the wide resistor. There is known a resistor in which an electrode portion is formed by joining thin Cu plates (see Patent Document 1 [0012] to [0014] and [FIG. 1] below).

  In addition, as a method of manufacturing this type of resistor, a step of forming a resistor plate in which only the central portion excluding both ends of the belt-shaped metal plate is rolled from both sides to reduce the thickness of the central portion, An element forming step having one end continuous and an independent terminal at the other end with a rolled width being punched at predetermined intervals, a step of forming a resistance value adjusting slit on a side surface of the resistance element, and a surface of the resistance element There is known a method of manufacturing a resistance element including a step of covering with an insulating material and a step of cutting the resistance element at one continuous end (Patent Document 2 [0029] to [0033], [FIG. 2] below) [See FIG. 3].

Japanese Patent No. 4452196 JP 2000-232007 A

  However, in the conventional metal resistor and its manufacturing method, it is difficult to form electrode portions at both ends with the same width so as to match the width of the central portion (narrow portion) of the resistor. There is a problem that the resistance value changes due to an error in the shape of the substrate. That is, in a micro resistor having a resistance value of about 1 mΩ, the resistance value changes due to a width error that occurs when the width of the central portion (narrow portion) of the resistor is the same as the width between the electrode portions. However, it was difficult to adjust the resistance value to 1 mΩ only by machining.

  Of course, it is conceivable to grind the surface of the resistor after processing, or to adjust the resistance value one by one by adjusting the slit, but it is complicated and not practical.

  In view of the above circumstances, an object of the present invention is to provide a resistor and a method for manufacturing the resistor that can make the resistance value a desired value and can eliminate the need for fine adjustment after processing. To do.

The resistor of the first invention is a resistor formed by processing a long plate-like metal resistor,
A groove portion obtained by processing a central portion on the back surface side where the resistor comes into contact with the substrate into a groove having a first width and a first thickness so as to be orthogonal to the longitudinal direction of the resistor;
A pair of electrode portions formed at both ends of the groove portion;
It is characterized by comprising a pair of notch portions in which side surfaces adjacent to each other and facing each other are notched with a second width wider than the first width.

  According to the resistor of the first invention, the resistance value of the resistor is determined by the distance between the pair of notches and the first thickness which is the processed thickness of the groove. Therefore, the resistance value can be determined by the first thickness of the groove, and the resistance value can be set to a desired value.

  Furthermore, at this time, by making the second width of the notch wider than the first width of the groove, both ends of the notch extend beyond the groove to the outside of the groove. As a result, the resistance value can eliminate the influence of the processing accuracy at both ends of the notch, i.e., the influence of the width error that occurs when the width of the groove and the width of the notch are the same, and the resistance value varies. It is possible to prevent the occurrence of fine adjustment after processing.

  Thus, according to the resistor of the first invention, the resistance value can be set to a desired value with the first thickness of the groove portion, and fine adjustment after processing can be made unnecessary.

The resistor of the second invention is the first invention,
A part or all of the surface side of the resistor, the groove, and the pair of notches are molded with an insulating resin.

  According to the resistor of the second invention, in addition to the case where only the surface side of the resistor, only the groove, or only the pair of notches are molded with an insulating resin, two or all of these are molded. Thus, it is possible to prevent a resistor that does not require fine adjustment after processing from being changed by resistance due to corrosion after oxidation.

A method for manufacturing a resistor according to a third aspect of the present invention is a method for manufacturing a resistor, in which a resistor is manufactured from a hoop metal plate having a metal resistor as a base material.
A first step of forming a groove portion by processing a central portion of the hoop material metal plate into a groove having a first width and a first thickness in the longitudinal direction;
A slit hole perpendicular to the longitudinal direction of the hoop material metal plate in which the groove portion is formed in the first step and having a second width wider than the first width is provided at predetermined intervals. A second step of forming
The groove part side of the hoop material metal plate in which the slit hole is formed in the second step is pressed against a base plate, and an insulating resin is outsert-molded from the opposite side to the groove part, and the groove part and the slit are formed. A third step of molding the hole and the surface of the hoop material opposite to the groove,
And a fourth step of cutting the metal sheet of the hoop material molded in the third step through the slit hole in parallel with the slit hole.

  According to the method for manufacturing a resistor of the third invention, the resistance value of the resistor manufactured by the manufacturing method is formed in the interval between the adjacent slit holes formed in the second step and in the first step. It is determined by the first thickness which is the processed thickness of the groove. Therefore, the resistance value can be determined by the first thickness of the groove, and the resistance value can be set to a desired value.

  Furthermore, at this time, by making the second width of the slit hole wider than the first width of the groove portion, both end portions of the slit hole extend beyond the groove portion to the outside of the groove portion. Thereby, the resistance value can eliminate the influence of the processing accuracy at both ends of the slit hole, that is, the influence of the width error that occurs when the width of the groove and the width of the notch are made the same, and the resistance value varies. It is possible to prevent the occurrence of fine adjustment after processing.

  Further, according to the method for manufacturing a resistor of the third invention, by forming a slit hole in advance in the second step, if cutting is performed so as to pass through the slit hole in the fourth step (the resistance value is Since it depends only on the interval between adjacent slit holes and not on the cutting accuracy, it can be prevented that the resistance value varies more than the cutting accuracy, and fine adjustment after processing is not necessary.

  Furthermore, since fine adjustment after processing is not required, the metal sheet with the slit holes formed in the second step can be molded with an insulating resin in the third step. Continuous manufacturing is possible by cutting in four steps to form resistors.

  Thus, according to the method for manufacturing a resistor of the third aspect of the invention, the resistance value can be set to a desired value with the first thickness of the groove, and a resistor that does not require fine adjustment after processing is continuously manufactured. be able to.

According to a fourth aspect of the present invention, there is provided a method for manufacturing the resistor in the third aspect of the invention
In the first step, the groove is formed by cutting.

  According to the resistor manufacturing method of the fourth aspect of the invention, depending on the first thickness which is the processed thickness of the groove portion formed in the first step, the groove portion is formed by cutting so that the processed thickness of the groove portion is reduced. A certain first thickness can be adjusted, the resistance value can be adjusted only by the machining, and fine adjustment after processing can be made unnecessary.

According to a fifth or fourth aspect of the present invention, there is provided a method of manufacturing the resistor according to the third or fourth aspect of the invention.
The hoop metal plate is a clad material in which different materials are fused.

  According to the method for manufacturing a resistor of the fifth invention, in addition to manufacturing a resistor from a hoop metal plate having a metal resistor as a base material, for example, Cu serving as an electrode portion on the base material of the resistor The manufacturing method can also be applied to a hoop metal plate to which dissimilar metals such as the above are joined. In this case, it is not necessary to form a new electrode part by subjecting the manufactured resistor to Cu plating or the like, and it is possible to continuously manufacture resistors that do not require plating after processing.

The perspective view which shows the resistor of this embodiment. The flowchart which shows the processing content of the manufacturing method of the resistor of this embodiment. Explanatory drawing which shows the processing content according to the flowchart of FIG. Explanatory sectional drawing in case a hoop material metal plate is used as a clad material.

  As shown in FIG. 1A, a resistor 1 according to this embodiment is a long plate-like metal resistor, and includes a groove portion 2 and a pair of electrode portions 3 formed at both ends of the groove portion 2. , 3 and a pair of notches 4, 4 in which the opposite side surfaces adjacent to the groove 2 are notched.

  The resistor constituting the resistor 1 is, for example, an alloy of Cu, Mn, and Sn, and is adjusted in advance at the melting / casting stage so as to have a predetermined specific resistance value.

  The groove portion 2 is formed by processing a central portion of one surface of the resistor into a groove having a first width L1 and a first thickness d1 so as to be orthogonal to the longitudinal direction of the resistor. The first width L1 and the first thickness d1 both determine the resistance value of the resistor 1, and are determined in advance at the stage of designing the resistor 1. In addition, although the surface in which this groove part 2 is formed turns into the back surface side of the resistor which contacts a board | substrate (illustration omitted), the groove part 2 may be formed in any surface of a resistor.

  The pair of electrode portions 3 and 3 are portions remaining on the back surface side of the resistor due to the processing of the groove portion 2 and are portions that are electrically connected to the substrate when mounted on the substrate (not shown).

  The pair of cutouts 4 and 4 are formed by cutting out the center part of the opposing side surfaces adjacent to the groove part 2 with the second width L2 and the depth d2. At this time, the second width L2 is wider than the first width L1.

  Therefore, both end portions 4 a and 4 a of the notch portion 4 can be positioned outside both end portions 2 a and 2 a of the groove portion 2. Thereby, in the resistance value of the resistor 1, the influence of the processing accuracy of the both ends 4a and 4a of the notch 4, that is, the error in the shape between these when the groove 2 and the notch 4 have the same width. Can be eliminated, variation in resistance value can be prevented, and fine adjustment after processing can be made unnecessary.

  In this case, the resistance value of the resistor 1 is determined by the first width L1 of the groove portion 2, the remaining thickness t1 and the depth W (the depth d2 of the notch portion 4) formed by the groove portion 2 with the first thickness d1. Therefore, the resistance value can be adjusted by finely adjusting the first thickness d1 that is the processed thickness of the groove 2 during processing, and fine adjustment after processing is also unnecessary.

  As shown in FIG. 1B, it is preferable that the resistor 1 of this embodiment is molded except for the electrode surface which is a portion electrically connected to the substrate when mounted on the substrate (not shown). . That is, it is preferable to mold the surface side of the resistor, the groove 2, and the pair of notches 4. Thereby, it can prevent that the resistance value changes by corrosion after the resistor 1 after a process oxidizes.

  In addition, at least by molding the groove 2, when mounted on the substrate, the solder does not protrude from the pair of electrode portions 3, 3 into the portion of the resistor between them, and the resistance value of the mounting state that can be generated by the protrusion Can be prevented.

  In addition, in FIG.1 (b), although it showed about the case where the surface side of a resistor, the groove part 2, and all of a pair of notch parts 4 were molded, it is not limited to this, Some of these are shown. You may mold.

  Next, a method for manufacturing the resistor 1 configured as described above will be described with reference to FIGS.

  As shown in FIG. 2, in the manufacturing method of the resistor 1 of this embodiment, first, a hoop material metal plate 10 using a metal resistor as a base material is manufactured (FIG. 2 / STEP 10).

  Specifically, for example, a hoop metal plate 10 having a predetermined width is manufactured by rolling an alloy obtained by melting and casting Cu, Mn, and Sn.

  The hoop metal plate 10 manufactured in this way is schematically shown in FIG.

  Next, with respect to the hoop metal plate 10 manufactured in STEP 10, in the first step, the central portion of the hoop metal plate in the longitudinal direction is grooved with the first width L1 and the first thickness d1 to obtain a groove portion. 2 is formed (FIG. 2 / STEP 11).

  Specifically, in the first step, the groove portion 2 is formed by cutting. This is because the machining thickness can be finely adjusted by cutting, and the resistance value of the resistor 1 can be adjusted only by machining. In the cutting process, a milling machine may be used as a processing machine. When the hoop metal plate 10 is thin, it is processed by pressing a bite while moving the hoop metal plate 10 at a constant speed. Also good.

  FIG. 3B schematically shows the hoop material metal plate 10 in which the groove 2 is formed in the first step of STEP 11.

  Next, a slit hole is formed in the second step in the hoop metal plate 10 grooved in STEP 11 (FIG. 2 / STEP 12).

  Specifically, in the second step, slit holes 40 perpendicular to the longitudinal direction are formed at predetermined intervals on the hoop metal plate 10 on which the groove 2 is formed. As will be described later, the slit hole 40 is cut to pass through the slit hole 40 (see STEP 14), thereby forming the cutout 4. Therefore, the width of the slit hole 40 is the second width L2, and the depth is twice the depth d2 of the notch 4. The interval between the adjacent slit holes 40 is determined so that the depth W of the groove 2 (see FIG. 1) becomes a predetermined value.

  Actually, in the continuous processing by the manufacturing method, the slit hole 40 is pressed by a press machine while feeding the hoop metal plate 10 at a constant speed. Therefore, in order to periodically correct the gap between the slit holes 40, the slit holes 40 are engraved with a reset position at a constant period (for example, every 10 slit holes) (form another slit hole as a mark). It is desirable to do so.

  The hoop material metal plate 10 in which the slit holes 40 are formed in the second step of STEP 12 is schematically shown in FIG.

  Next, in the third step, the hoop material metal plate 10 in which the slit holes 40 are formed in STEP 12 is subjected to a molding process (FIG. 2 / STEP 13).

  Specifically, in the third step, the hoop material metal plate 10 in which the slit holes 40 are formed in STEP 12 is reversed (see FIG. 3D), and the grooved surface (back surface side) is a base plate (illustrated). Insulating resin is outsert-molded from the surface side, and the groove portion 2, the slit hole 40, and the surface of the metal plate 10 of the hoop material are molded. At this time, the resin can be caused to wrap around to the groove portion 2 through the slit hole 40. Furthermore, since the groove part 2 side is press-contacted with the base plate, only the groove part 2 (except the electrode part of the both ends) can be molded.

  In this case, as the insulating resin, for example, an epoxy-based resin and a phenol-based resin can be appropriately selected and used according to molding conditions.

  FIG. 3 (e) schematically shows the hoop metal plate 10 that has been subjected to the molding process in the third step of STEP13.

  Next, in the fourth step, the hoop material metal plate 10 subjected to the molding process in STEP 13 is cut in parallel with the slit hole 40 through the slit hole 40 (FIG. 2 / STEP 14).

  In the fourth step, the resistance value of the resistor 1 according to the manufacturing method is determined by the interval between the slit holes 40 formed in the second step. Therefore, it is possible to prevent variation in resistance value.

  The resistor 1 obtained by being cut from the hoop metal plate 10 in the fourth step of STEP 14 is schematically shown in FIG.

  The size of the resistor 1 thus obtained is, for example, a predetermined thickness of about 6 mm × about 3 mm and 1 mΩ, or a predetermined thickness of about 3 mm × about 1.5 mm and 1 mΩ.

  Next, the resistor 1 obtained by cutting from the hoop metal plate 10 in STEP 14 is evaluated (FIG. 2 / STEP 15). As an evaluation method of the resistor 1, in addition to inspection by visual inspection or the like, the resistance value is measured to confirm whether or not a predetermined resistance value is obtained.

  When the resistance value of the resistor 1 is measured, a plating process for forming a Cu layer and a Sn layer is performed on the pair of electrode portions 3 and 3 in the same manner as when mounted on a substrate (not shown). Is preferred. The plating process on the pair of electrode portions 3 and 3 may be performed on the obtained resistor 1 in the series of manufacturing steps, or may be performed at the time of mounting on the substrate.

  As described above, according to the manufacturing method of the resistor 1, the resistance value of the manufactured resistor 1 is equal to the interval between the adjacent slit holes 40 formed in the second step of STEP 12 and the first step of STEP 11. It is determined by the first thickness d1, which is the processed thickness of the formed groove 2. Therefore, the resistance value can be set to a desired value by adjusting the first thickness d1 of the groove 2 by keeping the interval between the adjacent slit holes 40 constant.

  Furthermore, by making the second width L2 of the slit hole 40 wider than the first width L1 of the groove part 2, both ends of the slit hole 40 (notch part 4) can be positioned outside the groove part 2. As a result, the resistance value is influenced by the processing accuracy at both ends of the slit hole 40 (notch portion 4), that is, when the width of the groove portion 2 and the slit hole 40 (notch portion 4) is the same, The influence of this error can be eliminated, the resistance value can be prevented from varying, and fine adjustment after processing can be made unnecessary.

  Further, by forming the slit hole 40 in the second step of STEP 12 in advance, if the cutting is performed so as to pass through the slit hole in the fourth step of STEP 14, it is possible to prevent variation in resistance value due to cutting accuracy. And fine adjustment after processing is not necessary.

  Further, since fine adjustment after processing is unnecessary, it is possible to mold the hoop material metal plate in which the slit hole is formed in the second step of STEP12 with an insulating resin in the third step of STEP13. This can be continuously manufactured as a resistor by cutting in the fourth step of STEP14.

  Thus, according to the method for manufacturing a resistor of the present embodiment, the resistance value can be set to a desired value by the first thickness d1 of the groove portion 2, and the resistance value varies in the subsequent processing steps. Thus, it is possible to continuously manufacture the resistor 1 that does not require fine adjustment after processing.

  In addition, in the manufacturing method of the resistor 1 of this embodiment, although the case where the resistor 1 was manufactured from the hoop metal plate 10 which used a metal resistor as a base material was demonstrated, it is not limited to this. For example, the manufacturing method may also be applied to a hoop metal plate in which a dissimilar metal such as Cu serving as an electrode portion is joined to a base material of a resistor.

  For example, as shown in a cross-sectional view in FIG. 4 (a), an electrode such as Cu having the same width as the base material of the resistor (the same material as the hoop material metal plate 10 of the present embodiment) 10 ' The manufacturing method may be applied to a clad material formed by fusing different types of metals 30. In this case, in the first step of STEP 11, the broken line portion in the drawing is cut to form the groove portion 2.

  Further, as shown in a cross-sectional view in FIG. 4B, a clad material formed by fusing a dissimilar metal 30 serving as an electrode of Cu or the like so as to cover the base material 10 ′ of the resistor. The manufacturing method may be applied. In this case, in the first step of STEP 11, the broken line portion in the drawing is cut to form the groove portion 2.

  Further, as shown in the cross-sectional views of FIGS. 4C and 4D, a dissimilar metal 30 serving as an electrode such as Cu is welded to the base material 10 ′ of the resistor so as to cover both ends thereof. The manufacturing method may be applied to the clad material. In this case, in the first step of STEP 11, the broken line portion in the drawing is cut to form the groove portion 2.

  When the manufacturing method is applied to the hoop material metal plate made of the clad material in which the dissimilar metal 30 such as Cu serving as the electrode portion is bonded to the resistor base material 10 'in this way, the manufactured resistor No need for a Cu base plating treatment in 1 makes it possible to continuously manufacture a highly stable resistor 1 when measuring a resistance value.

  In particular, in the manufacturing method of the resistor 1 of the present embodiment, the groove 2 is formed by cutting in the first step of STEP 11. Therefore, (for example, when the clad material is rolled by a roll or the like, the arrangement of the base material 10 ′ of the resistor and the dissimilar metal 30 is deformed, and a desired resistance value can be obtained. Although difficult, according to the manufacturing method of the resistor 1 of the present embodiment, the groove portion 2 is formed by cutting without causing deformation of the arrangement of the base material 10 ′ of the resistor and the dissimilar metal 30 with respect to the clad material. Precision processing can be performed, and a desired resistance value can be obtained.

  Moreover, although this embodiment demonstrated the case where the groove part 2 was precisely processed by cutting with respect to the hoop material metal plate 10 in the 1st process of STEP11, it is not limited to this, By a roll etc. It is good also as a rolling process.

DESCRIPTION OF SYMBOLS 1 ... Resistor, 2 ... Groove part, 3 ... Electrode part, 4 ... Notch part, 10 ... Hoop material metal plate, 10 '... Base material of a resistor, 30 ... Dissimilar metal, 40 ... Slit hole.

Claims (5)

A resistor formed by processing a long plate-shaped metal resistor,
A groove portion obtained by processing a central portion on the back surface side where the resistor comes into contact with the substrate into a groove having a first width and a first thickness so as to be orthogonal to the longitudinal direction of the resistor;
A pair of electrode portions formed at both ends of the groove portion;
A resistor comprising: a pair of cutout portions in which side surfaces adjacent to each other and facing each other are cut out with a second width wider than the first width. The resistor of claim 1, wherein
A resistor, wherein a part or all of a surface side of the resistor, the groove, and the pair of notches are molded with an insulating resin. A resistor manufacturing method for manufacturing a resistor from a hoop metal plate using a metal resistor as a base material,
A first step of forming a groove portion by processing a central portion of the hoop material metal plate into a groove having a first width and a first thickness in the longitudinal direction;
A slit hole perpendicular to the longitudinal direction of the hoop material metal plate in which the groove portion is formed in the first step and having a second width wider than the first width is provided at predetermined intervals. A second step of forming
The groove part side of the hoop material metal plate in which the slit hole is formed in the second step is pressed against a base plate, and an insulating resin is outsert-molded from the opposite side to the groove part, and the groove part and the slit are formed. A third step of molding the hole and the surface of the hoop material opposite to the groove,
A method of manufacturing a resistor, comprising: a fourth step of cutting the metal sheet of the hoop material molded by the third step through the slit hole and in parallel with the slit hole. In the manufacturing method of the resistor of Claim 3,
In the first step, the groove is formed by cutting. In the manufacturing method of the resistor of Claim 3 or 4,
The method of manufacturing a resistor, wherein the hoop metal plate is a clad material obtained by fusing different materials.