JPH07122401A - Electronic component - Google Patents

Abstract

PURPOSE:To get a precise resistance value by a method wherein an electronic part is provided with a resistor part showing a specific resistance value as well as at least two electrode parts formed on both ends of the resistor part so that the resistor part and the electrode parts may be integrally formed having a specific stepped part. CONSTITUTION:A resistor 1 is provided with two electrodes 2a, 2b formed on almost the same plane while a resistor element and the electrodes 2a, 2b formed of the same material have a specific stepped part. Next, a specific channel member is formed of a band type Cu, Ni, Fe base alloy material so as to manufacture the resistor in a specific shape by cutting off this resistor channel member 3 in the width capable of getting a specific resistance value. Through these procedures, the element part and electrode parts need not be connected by welding step etc., thereby enabling the title electronic part required of no complicated steps at all for sustaining the reliability upon the connected parts to be manufactured furthermore, the precise resistance value to be got due to no fluctuation in the resistance value when the electronic component is inserted into a printed board to be connected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic component, and more particularly to an electronic component such as a thin film resistor for setting an amplification degree and a voltage division ratio in an analog circuit such as a precision measuring instrument.

[0002]

2. Description of the Related Art Conventionally, in surface mount type electronic parts, element parts and electrode parts made of different materials are connected by welding or the like. Further, conventionally, as a shunt resistor for detecting a current value in a power supply device or the like, as shown in FIG.
A resistor as shown in was used. That is, a manganin wire or the like having a diameter of about several mm is processed into the shape shown in the figure to form a resistor of about 10 mΩ. The current value can be detected from the voltage generated at both ends of the resistor by arranging the resistor in series with the current path by inserting the solder into the printed board and soldering.

[0003]

However, the above-mentioned conventional example has the following problems. That is, in the conventional surface mount type electronic component, since the element portion and the electrode portion made of different materials are connected by welding or the like, a complicated process is required to maintain the reliability of the connection portion. .

Further, in the conventional shunt resistor,
When manufacturing a resistor of several hundred mΩ, it is necessary to make the wire diameter thin in order to obtain the desired resistance value without increasing the wire length, a stable shape cannot be obtained, and the allowable current value is There was a problem such as a drop. Furthermore, when inserting and connecting to a printed board or the like, the resistance value varies depending on how far the end portion is inserted, and a precise resistance value cannot be obtained.

[0005]

SUMMARY OF THE INVENTION The present invention is intended to solve the above problems, and has the following structure as one means for solving the above problems. That is, a resistance part having a predetermined resistance value and at least two electrode parts formed at both ends of the resistance part are provided, and the resistance part and the electrode part are integrally formed with a predetermined step. Characterize.

Further, a resistance part having a predetermined resistance value and a projection part of which partly projects from the surface of the resistance part in the vicinity of both ends of the resistance part are provided, and the projection part is provided from the end part of the resistance part. It is characterized by using up to electrodes. Preferably, the portion near the center of the resistance portion has a cylindrical coil shape.

[0007]

According to the above construction, it is not necessary to connect the element portion and the electrode portion by welding or the like, and it is possible to provide an electronic component which does not require a complicated process for maintaining the reliability of the connection portion. In addition, since the resistance value does not fluctuate when it is inserted and connected to a printed circuit board, etc., it is possible to obtain a precise resistance value. It is possible to provide an electronic component that does not need to be thin and that has a stable shape without lowering the allowable current value.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An electronic component according to an embodiment of the present invention will be described in detail below with reference to the drawings.

[0009]

[First Embodiment] An embodiment in which the present invention is applied to a surface mount type resistor will be described below. However, the present invention is not limited to a resistor and may be applied to a surface mount type capacitor or inductor. Applicable. FIG. 1 is a perspective view showing an example of the shape of the resistor of this embodiment.

In the figure, reference numeral 1 is a resistor, which has electrodes 2a and 2b formed on substantially the same plane. The resistance element and the electrodes 2a and 2b are made of the same material and have a predetermined step. That is, the resistor 1 is manufactured by processing a strip-shaped resistor into the shape shown in FIG. The material of the resistor is determined in consideration of the desired resistance value and the temperature coefficient of the resistor, but a strip or plate of Cu, Ni, Fe-based alloy is preferable. Further, the thickness of the strip or plate, the length of the resistance element after processing, etc. are also determined by the desired resistance value.

FIG. 2 is a perspective view showing another manufacturing method of the present embodiment, in which the resistor 3 having a predetermined channel is cut by a width which gives a desired resistance value.
The resistor 1 having the shape of (a) is manufactured. It goes without saying that the resistor 1 having the shapes shown in FIGS. 1B and 1C can also be manufactured by this method. In consideration of solderability when mounting this embodiment, the electrodes 2a and 2b may be plated with solder, or the resistance element may be plated with anti-corrosion to prevent the adhesion of solder. Or resin coating may be applied.

Further, when it is necessary to adjust the resistance value in this embodiment, it is performed by cutting a part of the resistance element to narrow the current path as shown in FIG. The number and position of the cuts 4 are arbitrary. As described above, according to this embodiment, since the resistance element and the electrode are formed of the same material and it is not necessary to connect them by welding or the like, troubles related to this connection do not occur, and reliability is improved. A high resistor can be obtained. Furthermore, when this embodiment is mounted on a printed circuit board, etc., since there is a space between the mounting surface and the resistive element, the heat generated by the resistive element is not directly transmitted to the printed circuit board, etc. Can reduce the effect of.

[0013]

[Second Embodiment] A resistor according to a second embodiment of the present invention will be described below. 4A and 4B are views showing an example of the resistor according to the present embodiment. FIG. 4A is a front view and FIG. 4B is a side view.
In the figure, 11 is a resistor, which is provided with electrodes 12a and 12b. That is, the resistor 11 is manufactured by processing a linear resistor into the shape shown in FIG. Further, above the electrodes 12a and 12b, there are stopper portions 13a and 13b which have a cross section different from that of the resistance element, for example, by crushing a predetermined position of the resistance element, and a part of which protrudes from the surface of the resistance element. The material of the resistor is determined in consideration of the desired resistance value and the temperature coefficient of the resistor, but a wire material of Cu, Ni, Fe-based alloy is preferable. In addition, the line length, the length of the resistance element after processing, and the like are also determined according to the desired resistance value.

With this structure, for example, when the present embodiment is inserted into a printed board or the like, the stopper portion 13 is formed.
The insertion amount is regulated by a and 13b. 5A and 5B are views showing another shape of the resistor according to the present embodiment. FIG. 5A is a front view and FIG. 5B is a side view. The resistor 14 shown in FIG.
Is a cylindrical coil, and the resistor 11 having the shape shown in FIG.
It is possible to obtain a larger resistance value as compared with. That is, the resistance element length of the resistor 14 can be 10 times or more that of the resistor 11, and even if a wire member of the same wire is used to prevent the allowable current value from decreasing, it is 50 to 500 m.
A resistor of about Ω can be easily manufactured.

In consideration of solderability when mounting this embodiment, the electrodes 12a and 12b are plated with solder, and further, in consideration of anti-corrosion and anti-corrosion of solder, the resistance is The element may be plated or resin coated. As described above, according to the present embodiment, the amount of insertion into a printed board or the like can be regulated, so that it is possible to suppress variations in resistance value and obtain a precise resistance value. Furthermore, a resistance value of several tens to several hundreds mΩ can be easily obtained without making the wire diameter thin, so that a stable shape can be obtained and the allowable current value does not decrease.

[0016]

As described above, according to the present invention, there is no need to connect the element portion and the electrode portion by welding or the like, and an electronic component that does not require a complicated process for maintaining the reliability of the connection portion is provided. Has the effect of In addition, since the resistance value does not fluctuate when it is inserted and connected to a printed circuit board, etc., it is possible to obtain a precise resistance value. There is an effect that the electronic component can obtain a stable shape without needing to be thin and reducing the allowable current value.

[Brief description of drawings]

FIG. 1 is a perspective view showing a shape example of a resistor according to an embodiment of the present invention.

FIG. 2 is a perspective view showing another manufacturing method of the present embodiment.

FIG. 3 is a diagram showing an example of a resistance value adjusting method of the present embodiment.

FIG. 4 is a diagram showing an example of a resistor according to a second exemplary embodiment of the present invention.

FIG. 5 is a diagram showing another shape of the resistor of the second embodiment.

FIG. 6 is a view showing a shape of a conventional shunt resistor.

[Explanation of symbols]

 1 Resistor 2a, 2b Electrode 3a, 3b Stopper 4 Notch 11 Resistor 12a, 12b Electrode 13a, 13b Stopper 14 Resistor

Claims (3)

[Claims] 1. A resistance part having a predetermined resistance value, and at least two electrode parts formed at both ends of the resistance part, wherein the resistance part and the electrode part are integrally formed with a predetermined step. An electronic component characterized in that 2. A resistance part having a predetermined resistance value, and a projection part of which is partially projected from a surface of the resistance part in the vicinity of both ends of the resistance part, wherein the projection part is provided from an end part of the resistance part. An electronic component characterized by using up to electrodes. 3. An electronic component, wherein a portion near the center of the resistance portion has a cylindrical coil shape.