JP3539109B2 - Manufacturing method of resistor - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method of manufacturing a resistor used for various electronic devices, and more particularly to a method of manufacturing a low-resistance resistor used for a current detection circuit and the like.
[0002]
[Prior art]
As a conventional method for manufacturing a resistor, a method disclosed in Japanese Patent Application Laid-Open No. 6-267707 is known.
[0003]
Hereinafter, a conventional method for manufacturing a resistor will be described with reference to the drawings.
[0004]
FIG. 3A is a top view of a conventional resistor as a perspective view of a resistor which is a main part of the resistor, and FIG. 3B is a side view of the resistor.
[0005]
In the figure, reference numeral 1 denotes a first ceramic substrate. Reference numeral 2 denotes a metal resistor provided on the upper surface of the first ceramic substrate 1 and made of an alloy plate of various metals such as a copper-nickel plate, a manganin plate, a constantan plate, and a nichrome plate. Reference numeral 3 denotes a pair of current terminal equivalent portions provided by bending the metal resistor 2 in a U-shape on opposite side surfaces of the first ceramic substrate 1. Reference numeral 4 denotes a pair of voltage terminal equivalent portions provided by bending the metal resistor 2 into a U-shape on one side of the first ceramic substrate 1 not having the current terminal equivalent portion 3. Reference numeral 5 denotes a notch provided in the metal resistor 2 by trimming to adjust the resistance value of the metal resistor 2. Reference numeral 6 denotes a second ceramic substrate provided on the upper surface of the first ceramic substrate 1 with the metal resistor 2 interposed therebetween.
[0006]
A method of manufacturing the conventional resistor configured as described above will be described below.
[0007]
FIG. 4 is a diagram showing a method of manufacturing a resistor group, which is a main part of a conventional method of manufacturing a resistor.
[0008]
First, as shown in FIG. 4A, a resistor group 22 in which a plurality of mold resistors 21 are formed is formed by pressing a metal alloy plate with a die.
[0009]
Next, as shown in FIG. 4B, a current is applied between the current terminal equivalent portions 23 at both ends of the resistor group 22 to measure the voltage between the voltage terminal equivalent portions 24 of each metal resistor 21 while measuring each voltage. A notch 25 is formed in the metal resistor 21 by trimming, and the resistance value is corrected.
[0010]
Then, after forming a metal resistor 21 resistor group 22 is divided into pieces, first with an adhesive so as to sandwich the metal resistor 21, to form paste a second ceramic substrate.
[0011]
Next, the first ceramic substrate having no current terminal-corresponding portion 23 together by bending a metal resistor 21 at opposite sides of the first ceramic substrate to form a pair of current terminals corresponding portion 23 one The metal resistor 21 is bent on the side surface to form a pair of voltage terminal equivalent portions 24 .
[0012]
Next, the first and second ceramic substrates sandwiching the metal resistor 21 are insulated and sealed with an insulating material.
[0013]
Finally, the current terminal portion 23 and the voltage terminal portion 24 of the metal resistor 21 are plated with nickel and solder to manufacture a conventional resistor.
[0014]
[Problems to be solved by the invention]
However, in the above conventional manufacturing method, since the metal resistor 21 punched alloy plate various metals plurality continuously forming the resistor group 22, there is a problem that the utilization efficiency is poor.
[0015]
An object of the present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to provide a method of manufacturing a resistor having excellent use efficiency of a metal foil forming a resistor.
[0016]
[Means for Solving the Problems]
In order to achieve the above object, the present invention provides a step of forming a substantially elliptical through hole in a strip-shaped resistance foil, and a step of adjusting a resistance value by bringing a measurement terminal into contact with the vicinity of the through hole. A step of sandwiching the resistance foil with a resin made of a thermoplastic resin film so as to cover a part of the adjacent through-holes, and then heating or ultrasonically integrating the resin with the resistance foil. is there.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
According to the first aspect of the present invention, a step of forming a substantially elliptical through-hole in a belt-shaped resistance foil and a step of adjusting a resistance value by bringing a measuring terminal into contact with the vicinity of the through-hole. And, after sandwiching the resistance foil with a resin made of a thermoplastic resin film so as to cover a part of the adjacent through-hole, integrating the resin with the resistance foil by heating or ultrasonic waves, and Forming a terminal equivalent portion so as to protrude from the side surface of the resin, bending the terminal equivalent portion along the shape of the resin to form an external terminal equivalent portion, it is obtained by a step of plating the terminal corresponding portion.
[0018]
The invention of claim 2 includes the steps of forming a through hole of substantially elliptical shape in a strip of resistive foil plated beforehand surface, the measuring terminal by contact in the vicinity of the through hole A step of adjusting the resistance value and, after sandwiching the resistance foil with a resin made of a thermoplastic resin film so as to cover part of the adjacent through-holes, integrate the resin with the resistance foil by heating or ultrasonic waves Forming the external terminal by bending the through-hole so that the terminal equivalent portion protrudes from the side surface of the resin, and bending the terminal equivalent portion along the shape of the resin. it is obtained by a process.
[0019]
And also, the invention according to claim 3, plating forming a through hole of substantially elliptical shape in a strip of resistor foil, after removing the burr of forming the through holes to the resistance foil having the through-hole wherein the step of performing processing, and a step of adjusting the resistance value by abutting the measuring terminals in the vicinity of the through hole, a resin comprising a thermoplastic resin film so as to cover a portion of the adjacent through-holes A step of integrating the resin with the resistance foil by heating or ultrasonic waves after sandwiching the resistance foil, and a step of punching the through hole and forming a terminal equivalent portion from a side surface of the resin, along the shape of the resin is obtained and forming the external terminal by bending the terminal-corresponding portion.
[0020]
Hereinafter, a method for manufacturing a resistor according to an embodiment of the present invention will be described with reference to the drawings.
[0021]
1 and 2 are views showing a method for manufacturing a resistor according to an embodiment of the present invention.
[0022]
First, as shown in FIG. 1A, a substantially elliptical through hole is formed in the longitudinal direction of a resistor foil 31 formed in a belt shape in advance so as to have an interval corresponding to a manufacturing pitch of a resistor as a final product. 32 is formed by punching.
[0023]
Next, as shown in FIG. 1 (b), four styluses 33 are brought into contact with adjacent through holes 32 of the resistance foil 31, and while measuring the resistance value by the four-terminal method, the laser and the rotation are performed. The trimming groove 34 is formed by a trimming method such as a blade, a rotary grindstone, and sand blast.
[0024]
Next, as shown in FIG. 1 (c), a thermoplastic resin film than the width direction of the resistance foil 31 so as to sandwich a portion of the adjacent through-holes 32 with sandwiching the trimming groove 34 of the resistor foil 31 The resin 35 is overlaid.
[0025]
Next, as shown in FIG. 2A, only the resin 35 is integrated with the resistance foil 31 by heating or ultrasonic waves.
[0026]
Next, as shown in FIG. 2B, a central portion of the through-hole 32 of the resistance foil 31 is punched, and the terminal equivalent part 36 of the resistance foil 31 is formed to protrude from the opposite side surface of the resin 35. .
[0027]
Next, as shown in FIG. 2C, the terminal equivalent portion 36 of the resistance foil 31 protruding from the side surface of the resin 35 is bent along the side surface and the lower surface of the resin 35.
[0028]
Finally, in which plated to terminal-corresponding portion 36, to produce a resistor.
[0029]
In the above manufacturing method, when integrating the resin 35 to the resistor foil 31, since it is only heated or sonicated only resin 35, it is possible to integrate with less energy than the injection molding, When the injection molding machine is used, no resin is consumed in the runners, gates, etc., and the utilization efficiency of the resin is increased.
[0030]
In addition, since it can be integrated with a small amount of energy, the change in resistance value is smaller than that in injection molding.
[0031]
In the above-described embodiment of the present invention, a resistor foil formed in a belt shape is used. By using a resistance foil plated with, for example, continuous plating can be easily and accurately performed on a strip-shaped resistance foil, so that the plating treatment in the final step becomes unnecessary, and the same effects as those of the above-described embodiment of the present invention can be obtained. It is obtained.
[0032]
Also, in one embodiment of the present invention, a step of forming a through hole of substantially elliptical shape in a strip of resistor foil, between the step of trimming, the burr of forming the through hole after removing If the step of performing the plating process is provided, the plating process in the final hand process becomes unnecessary, and the same effect as in the above-described embodiment of the present invention can be obtained.
[0033]
【The invention's effect】
As described above, the method for manufacturing a resistor according to the present invention includes the steps of forming a substantially elliptical through-hole in a belt-shaped resistance foil, and adjusting a resistance value by bringing a measurement terminal into contact with the vicinity of the through-hole. And a step of integrating the resin with the resistive foil by heating or ultrasonic after sandwiching the resistive foil with a resin made of a thermoplastic resin film so as to cover part of the adjacent through-holes. As a result, it can be integrated with less energy compared to injection molding, and no resin is consumed in runners, gates, etc. when using an injection molding machine, which increases the efficiency of resin use. In addition, since they can be integrated with a small amount of energy, they have excellent effects such as a small change in resistance value as compared with injection molding .
[Brief description of the drawings]
1 (a) illustrating a ~ (c) the production method of FIG. FIG. 2 (a) ~ (c) the resistors for explaining a manufacturing method of resistor according to an embodiment of the present invention FIG. [ FIG. 3 (a) is a perspective view of a resistor which is a main part of a conventional resistor. FIG. 3 (b) is a side view of the same. FIG. 4 (a) and FIG. Diagram showing manufacturing method [Description of reference numerals]
31 resistance foil 32 through hole 33 stylus 35 resin 36 terminal equivalent part

Claims (3)

A step of forming a substantially elliptical through-hole in the belt-shaped resistance foil, a step of adjusting a resistance value by bringing a measurement terminal into contact with the vicinity of the through-hole, and covering a part of the adjacent through-hole. A step of sandwiching the resistance foil with a resin made of a thermoplastic resin film and then integrating the resin with the resistance foil by heating or ultrasonic waves, and punching out the through hole to form a terminal equivalent portion from a side surface of the resin. Forming the external terminal equivalent part by bending the terminal equivalent part along the shape of the resin, and plating the external terminal equivalent part . Manufacturing method of resistor. A step of forming a substantially elliptical through-hole in a strip-shaped resistance foil having a surface plated in advance, a step of adjusting a resistance value by bringing a measuring terminal into contact with the vicinity of the through-hole, After sandwiching the resistance foil with a resin made of a thermoplastic resin film so as to cover a part of the matching through hole, a step of integrating the resin with the resistance foil by heating or ultrasonic waves after punching the through hole, A method for manufacturing a resistor, comprising: forming a terminal equivalent portion so as to protrude from a side surface of the resin; and bending the terminal equivalent portion along the shape of the resin to form an external terminal. A step of forming a substantially elliptical through-hole in the belt-shaped resistance foil, a step of plating after removing burrs when the through-hole is formed in the resistance foil having the through-hole, and a step of performing plating near the through-hole. A step of adjusting the resistance value by contacting the measurement terminals, and heating or ultrasonically after sandwiching the resistance foil with a resin made of a thermoplastic resin film so as to cover a part of the adjacent through hole. A step of integrating a resin with the resistance foil; a step of punching the through hole to form a terminal equivalent portion so as to project from a side surface of the resin; and folding the terminal equivalent portion along the shape of the resin. method for producing a resistor and forming an external terminal and music.

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