JP2009231559A - Method of attaching resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it possible to adjust a resistance value in the lowering direction even if the resistance value higher than a desired resistance value appears in a resistor after an attachment, in a method of attaching the resistor by which the resistor is attached to a partner member to adjust the resistance value of the resistor. <P>SOLUTION: The attachment includes the steps of: previously providing an insulating layer 30 with an electric insulation on at least one front surface of a front surface of a resistor 10 and a front surface of a partner member 20; and welding the resistor 10 to the partner member 20 so as to break the insulating layer 30 in the state where the resistor 10 is loaded on the partner member 20 through this insulating layer 30. After forming a first welding point 41 where the resistor 10 and the partner member 20 are welded, this welding forms a second welding point 42 where the resistor 10 and the partner member 20 are welded at a position where a front surface of the resistor 10 is moved from the first welding point 41 in the direction in which a length of the resistor 10 using the first welding point 41 as a starting point becomes short. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a resistor assembling method for assembling a resistor to a mating member and adjusting the resistance value of the resistor.

For example, a shunt resistor for detecting a current value as a resistor is required to have an accurate resistance value. Therefore, there is a case where adjustment of the resistance value is required even when a dedicated part is assembled. In this case, conventionally, a method of adjusting a resistance value by cutting a prepared adjustment part of a resistor in advance after assembling has been proposed (see, for example, Patent Document 1).
JP-A-8-83969

  However, in the conventional assembly method described above, when a resistance value lower than a desired resistance value appears in the assembled resistor, the resistance value can be adjusted to be increased by cutting the adjustment portion. On the contrary, if a resistance value higher than the desired value appears, adjustment is impossible.

  The present invention has been made in view of the above problems, and in a method of assembling a resistor in which a resistor is assembled to a mating member and the resistance value of the resistor is adjusted, the resistor after assembly is more desirable than the desired resistance value. An object of the present invention is to make it possible to adjust the resistance value to a lower value even if a higher resistance value appears.

  In order to achieve the above object, in the invention described in claim 1, the assembly is performed in advance on the surface of the resistor (10) and at least one of the surfaces of the mating member (20) by an electrically insulating layer (30). In the state where the resistor (10) is mounted on the mating member (20) through the insulating layer (30), the resistor (10) and the mating member are broken so as to break the insulating layer (30). (20) is welded to form a welding point, and welding forms a first welding point (41) in which the resistor (10) and the mating member (20) are welded. After the first welding step, the length of the resistor (10) starting from the first welding point (41) is shortened from the first welding point (41) to the surface of the resistor (10). Second position where the resistor (10) and the mating member (20) are welded at the position moved in the direction. And characterized in that and a second welding step of forming a contact (42).

  According to this, the assembly of the resistor (10) is performed by welding, and since the insulating layer (30) is interposed between the resistor (10) and the mating member (20) except for the welding point, the welding point is It becomes an electrical connection. Then, after assembling the resistor (10) to the mating member (20) in the first welding process, when a resistance value higher than the target resistance value appears, a second welding process is further performed. Thus, since the length of the resistor (10) can be shortened, the resistance value of the resistor (10) can be adjusted to be lowered.

  Therefore, according to the present invention, even if a resistance value higher than a desired resistance value appears in the assembled resistor (10), it is possible to adjust the resistance value to be lowered.

  Here, as in the invention described in claim 2, after the second welding step, the resistor (10) may be bent and deformed. According to this, if the resistor (10) is bent and deformed, there is a shape effect that the resistance value of the resistor is lowered. Therefore, the resistance value of the resistor (10) is less than a desired value by the second welding process. Even if it becomes lower, it can be adjusted in the direction of increasing this time.

  Moreover, you may make it form a notch (11) or a hole (12) in a resistor (10) after a 2nd welding process like invention of Claim 3. Also in this case, even if the resistance value of the resistor (10) becomes lower than a desired value by the second welding process, it can be adjusted to be increased this time.

  In addition, the code | symbol in the bracket | parenthesis of each means described in the claim and this column is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals in the drawings in order to simplify the description.

(First embodiment)
The first embodiment of the present invention shows a method of welding a resistor and a mating member as a method of assembling the resistor. 1A and 1B are diagrams showing a method of assembling the resistor 10 according to the first embodiment of the present invention, where FIG. 1A is a schematic plan view of a workpiece after welding, and FIG. 1B is a schematic cross-sectional view of the workpiece before welding. (C) is a schematic sectional drawing of the workpiece | work after welding.

  The resistor 10 is made of a metal such as copper, a copper alloy (for example, an alloy of copper and nickel), or an iron-based metal, and has a long plate shape, that is, a ribbon shape. In addition, the resistance value of the resistor 10 can be controlled by adjusting the length, such that the resistance value decreases when the length is shortened and the resistance value increases when the length is increased. is there.

  The mating member 20 is a member such as a copper-based metal or an iron-based metal, such as a general lead member or bus bar, or an electrode portion of a wiring board. Here, the mating member 20 is provided with a left mating member 20 positioned on the left side in FIG. 1A and a right mating member 20 positioned on the right side. The resistor 10 has one end side and the other end side connected to the mating members 20 and 20 to electrically connect the mating members 20 and 20.

  The resistor 10 and the mating member 20 are not particularly limited to the above materials as long as they are electrically and mechanically connected to each other by welding. The assembly method of this embodiment is to adjust the resistance value of the resistor 10 by welding such a resistor 10 to the mating member 20, and this assembly method will be described with reference to FIG.

  First, an electrically insulating insulating layer 30 is provided in advance on at least one of the surfaces of the resistor 10 and the surfaces of both mating members 20 that face each other during assembly. Here, the insulating layer 30 is provided on the surface facing the resistor 10 when the mating members 20 are assembled.

  The insulating layer 30 is formed by applying and curing a resin such as polyimide to the surface with a paste, or by attaching a film or sheet. Alternatively, the insulating layer 30 is formed as an insulating film such as a metal oxide film by subjecting the surface of the counterpart member 20 to heat treatment or oxidant treatment, or vapor deposition or sputtering of an inorganic insulating material such as a silicon oxide film or a silicon nitride film. It may be formed as an insulating film.

  Further, the insulating layer 30 may be provided not on the surface of the counterpart member 20 but on the surface of the resistor 10 or on both surfaces of the members 10 and 20. The formation method of the insulating layer 30 in that case may be appropriately selected from the above-described formation methods.

  Further, the thickness of the insulating layer 30 is a thickness that can be broken by welding energy at the time of welding, which will be described later, and the electrical insulation between the resistor 10 and the mating member 20 at the portion where the insulating layer 30 is interposed. It is necessary to have a thickness that can be secured, and depending on the material, the thickness can be on the order of microns, for example.

  After the insulating layer 30 is formed in this way, in this assembling method, the resistor 10 is mounted on the two mating members 20 so as to connect the two mating members 20 as shown in FIG. . At this time, both the mating members 20 are in a state in which the resistor 10 is mounted on the mating member 20 via the insulating layer 30 as shown in FIG.

  Next, the resistor 10 is welded to the left mating member 20 in FIG. FIG. 1 shows an example of laser welding, and a laser such as YAG is irradiated from above the resistor 10 in FIGS. 1 (b) and 1 (c). As a result, the insulating layer 30 is broken by the welding energy, and the molten portion 40 in which the resistor 10 and the left counterpart member 20 are melted is formed.

  Thereby, this fusion | melting part 40 is made into the welding point 40, and the left side member 20 and the resistor 10 are welded in the said welding point 40. FIG. In addition, although the example of laser welding was shown here, even if it is other welding methods, such as resistance welding and ultrasonic welding, the welding point 40 similar to the above is formed by tearing and joining the insulating layer 30, Both members 10 and 20 are welded.

  Since the insulating layer 30 is broken at the welding point 40, the resistor 10 and the left mating member 20 are electrically connected to each other. However, in the region other than the welding point 40, the resistor 10 and the left mating member are connected. Since the insulating layer 30 is interposed between the member 20 and the member 20, the resistor 10 and the left mating member 20 are electrically insulated.

  That is, the welding point 40 is an electrical and mechanical connection point between the members 10 and 20. Moreover, also about each 1st-3rd welding points 41, 42, and 43 which are the welding points of the resistor 10 and the right side other member 20 which are shown below, the welding method and the form after welding are the above left side opponents. This is the same as the welding point 40 between the member 20 and the resistor 10.

  That is, these first to third welding points 41 to 43 are also portions where the insulating layer 30 is broken and the resistor 10 and the right mating member 20 are welded, and are configured as electrical and mechanical connection points. Has been. In the case of laser welding, these welding points 41 to 43 are also configured as the melting portion.

  Thus, after the end of the welding point 40 in the left mating member 20, the right mating member 20 and the resistor 10 in FIG. First, a first welding point 41 where the resistor 10 and the right mating member 20 are welded is formed at a position in the resistor 10 where the resistance value of the resistor 10 is larger than a desired value (1). Second welding process).

  1A shows lengths L1, L2, and L3 between the welding point 40 of the left mating member 20 and the welding points 41 to 43 of the right mating member 20 in the resistor 10. FIG.

  Here, the first length L1 is the distance between the welding point 40 of the left mating member 20 and the first welding point 41 of the right mating member 20, and the second length L2 is the distance of the left mating member 20. It is the distance between the welding point 40 and the second welding point 42 of the right mating member 20, and the third length L3 is between the welding point 40 of the left mating member 20 and the third welding point 43 of the right mating member 20. L3. Moreover, each length L1-L3 is a linear distance which connects between the center points of each welding point 40-43.

  Here, the second welding point 42 and the third welding point 43 are formed by sequentially performing the second welding step and the third welding step after the first welding step. The first length L1, the second length L2, and the third length L3 are shortened in this order. That is, with the formation of the first to third welding points 41 to 43, the resistance value between the left and right mating members 20 in the resistor 10 increases.

  In the first welding step, the first welding point 41 is formed in the resistor 10 at a position where the resistance value of the resistor 10 is larger than a desired value. In this embodiment, the resistor 10 The part where the resistance value of 10 becomes a desired value is the position of the third length L3, that is, the third welding point 43. That is, in the third welding process, the first welding point 41 is formed at a position where the resistance value of the resistor 10 becomes longer than the length of the resistor 10 at which the resistance value becomes a desired value.

  Next, in the assembling method of the present embodiment, the second welding process and the third welding process are performed as described above. In the second welding process, welding is performed at a position where the surface of the resistor 10 is moved from the first welding point 41 in a direction in which the length of the resistor 10 is shortened starting from the first welding point 41. A second weld point 42 is formed.

  With respect to this, referring to FIG. 1A, in the second welding process, the surface of the resistor 10 is moved from the first welding point 41 in the left direction in the drawing, that is, in the direction of the left mating member 20. That is, the length of the resistor 10 starting from the first welding point 41 moves in the direction of shortening from the first length L1 to the second length L2, and becomes the second length L2. Welding is performed at a position on the resistor 10.

  Thereby, the resistance value of the resistor 10 can be increased from the resistance value at the first length L1 to the resistance value at the second length L2. Furthermore, in this embodiment, since the resistance value of the resistor 10 is still larger than a desired value even after the second welding process, the third welding process is performed.

  In the third welding step, welding is performed at a position where the surface of the resistor 10 is moved from the second welding point 42 in the direction in which the length of the resistor 10 is shortened starting from the second welding point 42. 3rd weld point 43 is formed.

  With respect to this, referring to FIG. 1A, in the third welding step, the surface of the resistor 10 is moved from the second welding point 42 in the left direction in the figure, that is, in the direction of the left mating member 20. That is, the length of the resistor 10 starting from the second welding point 42 moves in the direction of shortening from the second length L2 to the third length L3, and becomes the third length L3. Welding is performed at a position on the resistor 10.

  Thereby, the resistance value of the resistor 10 can be increased from the resistance value at the second length L2 to the resistance value at the third length L3. Thus, in this embodiment, with the end of the third welding process, the resistance value of the resistor 10 becomes a desired value. The above is the assembling method of this embodiment.

  In this embodiment, the resistance value of the resistor 10 is sequentially increased by performing the second welding process, the third welding process, and the second welding process after the first welding process, Although it adjusted to the desired value, the welding process performed after the 1st welding process should just be performed until it becomes the said desired value, may be 1 time, and may be 3 times or more.

  That is, in the assembling method of the present embodiment, welding between the resistor 10 and the right mating member 20 is performed with resistance from the first welding point 41 and thereafter from the first welding point 41. A second welding step of forming a second welding point 42 at a position where the surface of the body 10 is moved in a direction in which the length of the resistor 10 starting from the first welding point 41 is shortened. It is good if it is.

  In the above example, when the first welding process is the first welding process, the second welding process corresponds to the second welding process, and the second welding process is the first welding process. The third welding process corresponds to the second welding process. That is, in the above example, the assembling method of the present embodiment in which the first welding process and the second welding process are performed is repeatedly performed twice.

  Thus, according to the assembling method of the present embodiment, the resistor 10 is assembled by welding, and the insulating layer 30 is interposed between the resistor 10 and the mating member 20 except for the welding points 41 to 43. Therefore, the welding points 41-43 become an electrical connection part.

  Then, after the resistor 10 is assembled to the mating member 20 in the first welding process, when a resistance value higher than the target resistance value appears, the resistor is further subjected to the second welding process. Since the length of 10 can be shortened, the resistance value of the resistor 10 can be adjusted to be lowered.

  Therefore, according to the assembling method of the present embodiment, even when a resistance value higher than a desired resistance value appears in the assembled resistor 10, the resistance value can be adjusted to be lowered.

  In the above example, after welding the left mating member 20 and the resistor 10, the resistance value was adjusted by performing the first and second welding steps for welding the right mating member 20 and the resistor 10. Needless to say, the resistance value may also be adjusted by performing the first and second welding steps for welding with the left mating member 20.

  Moreover, in the said example, in the position where the resistance value of the said resistor 10 becomes larger than a desired value among the resistors 10 in the 1st welding process as a 1st welding process, the resistor 10 and right side The first welding point 41 welded to the mating member 20 is formed. If the first welding point 41 is intentionally formed at a position where the resistance value is larger than a desired value in this way, the first welding point 41 is formed. The adjustment can be performed from the side with the higher resistance value.

  Of course, this assembling method may be applied when the resistance value becomes larger than a desired value as a result of forming the first welding point in the first welding step. .

(Second Embodiment)
2A and 2B are diagrams showing a method of assembling the resistor 10 according to the second embodiment of the present invention, in which FIG. 2A is a schematic plan view of a workpiece after welding, and FIG. 2B is a workpiece whose shape is adjusted after welding. (C) is a schematic sectional drawing which shows the 2nd example of the workpiece | work which adjusted the shape after welding, The said insulating layer is abbreviate | omitted. Here, the difference from the first embodiment will be mainly described.

  In the present embodiment, the ribbon-shaped or wire-shaped resistor 10 is assembled in the same manner as in the first embodiment by performing an assembling method having a first welding process and a second welding process, as shown in FIG. As shown, it is assembled to the mating member 20 in an arch shape.

  Specifically, the resistor 10 is assembled by performing welding with the left mating member 20 in the first embodiment, and further, the first, second, and third welding steps. Also in this case, when a resistance value higher than a desired resistance value appears in the assembled resistor 10, the resistor 10 is adjusted in a direction to lower the resistance value.

  Here, when the resistance value of the resistor 10 becomes too lower than a desired value by the second welding process (the second welding process or the third welding process), in the present embodiment, FIG. Alternatively, as shown in FIG. 2C, the resistor 10 is bent and deformed after the second welding step.

  The deformation of the resistor 10 can be easily performed with a jig or the like, but the arch-shaped resistor 10 shown in FIG. 2A is deformed so as to increase the bending point, and FIG. The first example shown in FIG. 2 and the second example shown in FIG. 2C are plastically deformed. Note that the resistor 10 may be sealed with a molding material such as an epoxy resin in order to maintain the shape of the resistor 10 after the deformation.

  According to the present embodiment, if the resistor 10 is bent and deformed, there is a shape effect that the resistance value of the resistor 10 is lowered. Therefore, the resistance value of the resistor 10 is more than a desired value by the second welding process. Even if it becomes low, there is an advantage that it can be adjusted in the direction of increasing this time.

(Third embodiment)
FIG. 3 is a schematic plan view showing a method for assembling the resistor 10 according to the third embodiment of the present invention. In FIG. 3, the welding points and the insulating layer are omitted. The difference from the first embodiment will be mainly described.

  In the present embodiment, the resistor 10 is assembled to the mating member 20 by performing an assembling method having a first welding process and a second welding process, as in the first embodiment. Also in this case, when a resistance value higher than a desired resistance value appears in the assembled resistor 10, the resistor 10 is adjusted in a direction to lower the resistance value.

  Here, when the resistance value of the resistor 10 becomes too lower than a desired value by the second welding process (the second welding process or the third welding process), then in this embodiment, in FIG. As shown, a notch 11 is formed in the resistor 10 after the second welding step. Here, the slit-shaped notch 11 is formed.

  The slit-shaped notch 11 can be formed in the resistor 10 with an energy beam such as a laser. FIG. 4 is a process diagram showing a forming method using the laser 51. A laser 51 such as YAG is irradiated from the laser nozzle 50 to the resistor 10 assembled to the counterpart member 20.

  At this time, since there is a concern that the components of the resistor 10 melted by the laser 51 are scattered around, it is desirable to provide a suction nozzle 60 driven by a vacuum pump or the like in the vicinity of the processing portion to suck the scattered matter. . This laser processing is performed while measuring the resistance value at both ends of the resistor 10.

  If the notch 11 is formed in the resistor 10 in this way, the resistance value of the resistor 10 can be increased. Therefore, even if the resistance value of the resistor 10 becomes lower than a desired value by the second welding process. This time, there is an advantage that it can be adjusted in the direction of increasing. The notch 11 may be formed by cutting the resistor 10 with a cutting tool or the like.

(Fourth embodiment)
FIG. 5 is a schematic plan view showing a method of assembling the resistor 10 according to the fourth embodiment of the present invention. In FIG. 5, the welding points and the insulating layer are omitted. The present embodiment is a partial modification of the third embodiment, and the description will focus on the deformation.

  In the present embodiment, when the resistance value of the resistor 10 becomes too lower than a desired value by the second welding process (the second or third welding process), as shown in FIG. In addition, after the second welding step, the notch 11 and the hole 12 are formed in the resistor 10 by drilling.

  The notches 11 and the holes 12 are formed in the resistor 10 using a punch 70 and a base 71 as shown in FIG. The resistor 10 assembled to the mating member 20 is supported by the base 71, and in this state, the punch 70 is lowered and the resistor 10 is punched to form the notch 11 and the hole 12 in the resistor 10. At this time, the resistance value is measured before and after the drilling step.

  Also according to this embodiment, since the resistance value of the resistor 10 can be increased, even if the resistance value of the resistor 10 becomes lower than a desired value by the second welding process, it can be adjusted in the direction of increasing this time. There is.

  In the present embodiment, both the semicircular cutout 11 and the circular hole 12 are formed by shifting the position where the hole is punched by the punch 70. However, by restricting the hole, In the embodiment, only the notch 11 may be present, or only the hole 12 may be present.

It is a figure which shows the assembly | attachment method of the resistor which concerns on 1st Embodiment of this invention, (a) is a schematic plan view of the workpiece | work after welding, (b) is a schematic sectional drawing of the workpiece | work before welding, (c) is It is a schematic sectional drawing of the workpiece | work after welding. It is a figure which shows the assembly | attachment method of the resistor which concerns on 2nd Embodiment of this invention, (a) is a schematic plan view of the workpiece | work after welding, (b) is a schematic sectional drawing which shows the 1st example of shape adjustment, (C) is a schematic sectional drawing which shows the 2nd example of shape adjustment. It is a schematic plan view which shows the assembly | attachment method of the resistor which concerns on 3rd Embodiment of this invention. It is process drawing which shows the formation method of the notch by a laser. It is a schematic plan view which shows the assembly method of the resistor which concerns on 4th Embodiment of this invention. It is process drawing which shows the notch and the formation method of a hole by a punch.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Resistor 11 Notch 12 Hole 20 Opposite member 30 Insulating layer 41 1st welding point 42 2nd welding point

Claims (3)

A method of assembling a resistor by assembling a resistor (10) to a mating member (20) and adjusting a resistance value of the resistor (10),
In the assembly, an electrically insulating insulating layer (30) is provided in advance on at least one of the surface of the resistor (10) and the surface of the counterpart member (20), and the insulating layer (30) is interposed therebetween. With the resistor (10) mounted on the mating member (20), the resistor (10) and the mating member (20) are welded so as to break the insulating layer (30). It is done by forming a welding point,
The welding includes a first welding step for forming a first welding point (41) in which the resistor (10) and the mating member (20) are welded as the welding point;
Thereafter, the surface of the resistor (10) is moved from the first welding point (41) in a direction in which the length of the resistor (10) is shortened starting from the first welding point (41). And a second welding step for forming a second welding point (42) in which the resistor (10) and the mating member (20) are welded as the welding point. Assembly method of the resistor characterized by the above.   The method of assembling a resistor according to claim 1, wherein the resistor (10) is bent and deformed after the second welding step.   The method of assembling a resistor according to claim 1 or 2, wherein a notch (11) or a hole (12) is formed in the resistor (10) after the second welding step.

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