JP3760577B2 - Resistor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resistor that is mounted on a substrate or the like constituting an electronic circuit and that particularly corresponds to a low resistance value.
[0002]
[Prior art]
As a conventional resistor, in JP-A-1-302701, a resistance value correction groove is formed from an end portion of a resistor formed between electrode terminals, and the opposite side of the start position of the resistance value correction groove is formed. A device in which a conductor is formed so as to partially overlap a resistor at a position is known.
[0003]
A conventional resistor will be described below with reference to the drawings.
[0004]
FIG. 7 is a plan view of a conventional resistor, and FIG. 8 is a diagram showing the relationship between the resistance value correction groove length and the resistance value, which is the main part of the resistor.
[0005]
In FIG. 7 , reference numeral 1 denotes an insulating substrate having a resistor 2 on its upper surface. 3 is a pair of electrode terminals provided partially overlapping so as to be electrically connected to the resistor 2 to one of the corners of the upper surface of the insulating substrate 1. Reference numeral 4 denotes a resistance value correcting groove provided from one end of the resistor 2 located between the pair of electrode terminals 3 toward the center of the resistor 2. Reference numeral 5 denotes a conductor provided on a side of the upper surface of the insulating substrate 1 in the full width direction so as to face the pair of electrode terminals 3 and to be electrically connected to the resistor 2.
[0006]
As shown in FIG. 8, the relationship between the resistance value correction groove length of the conventional resistor configured as described above and the resistor is such that the resistance value changes as the resistor 2 is trimmed from one end toward the center portion. To do. That is, the change in resistance value is large at the start of trimming, and the change in resistance value is small when reaching a certain length, resulting in a substantially constant resistance value.
[0007]
[Problems to be solved by the invention]
However, in order to obtain a very low resistance resistor, since the conductor 5 is provided in the entire width direction of the insulating substrate 1 in the conventional configuration, the corresponding resistance value is also detected . The resistance value of the conductor 5 must also be taken into account, and there is a problem that it is difficult to correct the resistance value.
[0008]
SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to obtain a highly reliable resistor that can be easily corrected by trimming and can cope with a low resistance value.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the present invention includes four electrode terminals provided at four corners of an insulating substrate, and one of the two electrode terminals opposed across the resistance correction groove is a voltage. The other two electrode terminals are current terminals .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention includes a rectangular insulating substrate, wherein the four electrode terminals provided at the four corners of the insulating substrate, connected the four electrode terminals electrically to the upper surface of the insulating substrate The four electrodes facing each other across the resistance value correction groove, and a resistance value correction groove provided in a direction in which a current flows from one end of the resistor toward a central portion. Among the terminals, one of the two electrode terminals is a voltage terminal, and the other two electrode terminals are current terminals, and the resistance value correction groove exhibits a descending characteristic in which the resistance value decreases as the length increases. It is.
[0011]
According to the above configuration, of the four electrode terminals facing each other across the resistance value correction groove, one of the two electrode terminals is a voltage terminal and the other two electrode terminals are current terminals, and the resistance value correction groove Since the resistance value decreases as the length increases , a resistance value correction groove is provided in the direction in which the current flows from one end of the resistor toward the center while measuring the current and voltage. , can be performed resistance correction as the resistance value length of the resistance value correction groove is longer decreases, and the resistance value can stop the resistance value correction was reached the target value, thereby, a low resistance value it is expected to have an effect that it is possible to obtain a highly reliable to cope resistor.
[0012]
(Embodiment 1)
Hereinafter, the resistor according to the first embodiment of the present invention will be described with reference to the drawings.
[0013]
FIG. 1 is a perspective view of a resistor according to Embodiment 1 of the present invention.
[0014]
In FIG. 1 , reference numeral 11 denotes a rectangular insulating substrate made of alumina or the like. Reference numeral 12 denotes an electrode terminal made of silver or the like provided at corners facing each other across a resistance value correcting groove 14 described later of the insulating substrate 11. Reference numeral 13 denotes a resistor made of ruthenium oxide or the like provided on the upper surface of the insulating substrate 11 so as to be electrically connected to the electrode terminal 12. Reference numeral 14 denotes a resistance value correction groove provided by laser light or the like from one end of the resistor 13 toward the center . Thus, due to the provision of the four electrode terminals 12 separate at the four corners across the resistance value correcting grooves 14, the current four-terminal, in the case of using a voltage measuring instrument or the like, two of the four electrode terminals 12 Can be used as voltage terminals and the other two can be used as current terminals.
[0015]
A method for manufacturing the resistor according to the first embodiment of the present invention configured as described above will be described below.
[0016]
2 and 3 are process diagrams showing a method for manufacturing a resistor according to the first embodiment of the present invention.
[0017]
First, as shown in FIG. 2A, a metal paste such as silver is printed on the upper and lower surfaces of the insulating substrate 22 having the slits 21 in the vertical and horizontal directions, and the electrodes are baked at about 800 ° C. Terminal 23 is formed.
[0018]
Next, as shown in FIG. 2B, a resistance paste such as ruthenium oxide is printed on the upper surface of the insulating substrate 22 so as to be electrically connected to the electrode terminal 23, and fired at about 620 ° C. to form the resistor 24. Form.
[0019]
Next, as shown in FIG. 2 (c), a measurement terminal (not shown) of a four-terminal digital multimeter is applied to the electrode terminal 23 to measure the current and voltage, and from one end of the resistor 24 to the center portion. The resistance value correcting groove 25 is formed using laser light in the direction in which the current flows toward. At this time, the resistance value correcting groove 25 is formed by cutting from one end of the resistor 24 and stopping the cutting when the target resistance value is reached.
[0020]
Next, the insulating substrate 22 formed in the previous step is primarily divided along the slit 21 to form a strip-shaped substrate 31 as shown in FIG.
[0021]
Next, as shown in FIG. 3B, a metal paste such as silver palladium is printed on the side surface of the strip-shaped substrate 31 that is primarily divided so as to be electrically connected to the electrode terminal 32, and is about 600 ° C. The side electrode 33 is formed by baking.
[0022]
Next, as shown in FIG. 3C, the strip-shaped substrate 31 formed in the previous step is secondarily divided to form individual pieces 34 to manufacture resistors.
[0023]
In addition, although the rectangular insulating substrate 11 is used in the resistor described above, a notch 42 may be provided between the electrode terminals 43 on the side of the insulating substrate 41 as shown in FIG. FIG. 4 is a plan view of a resistor according to another embodiment of the present invention.
[0024]
In FIG. 4 , reference numeral 41 denotes a rectangular insulating substrate made of alumina or the like having a pair of cutout portions 42 facing the side surfaces. Reference numeral 43 denotes an electrode terminal made of silver or the like provided at a corner of the insulating substrate 41. Reference numeral 44 denotes a resistor made of ruthenium oxide or the like provided on the upper surface of the insulating substrate 41 so as to be electrically connected to the electrode terminal 43. Reference numeral 45 denotes a resistance value correction groove provided by laser light or the like from one end of the resistor 44 toward the center. As described above, since the insulating substrate 41 has the cutout portion 42, the electrode terminals 43 opposed to each other with the cutout portion 42 interposed therebetween are formed independently, and can be formed without short-circuiting.
[0025]
(Embodiment 2)
Hereinafter, the resistor in Embodiment 2 of this invention is demonstrated, referring drawings.
[0026]
FIG. 5 is a plan view of a resistor according to Embodiment 2 of the present invention .
[0027]
In FIG. 5 , 51 is a rectangular insulating substrate made of alumina or the like. 52 are electrode terminals made of silver or the like provided at the four corners of the insulating substrate 51 with the same dimensions. Reference numeral 53 denotes a resistor made of ruthenium oxide or the like provided on the upper surface of the insulating substrate 51 so as to be electrically connected to the electrode terminal 52. Reference numeral 54 denotes a resistance value correcting groove provided by laser light or the like from one end of the resistor 53 that is equidistant from the opposing electrode terminal 52 toward the center. Thus, by making all the electrode terminals 52 into the same dimension, when mounting this resistor on a circuit board, it is not necessary to consider directionality and a mounting mistake can be reduced.
[0028]
About the resistor in Embodiment 1 and 2 of this invention comprised as mentioned above, the resistance value of a 3.2 mm x 1.6 mm size resistor is measured, and the length of a resistance value correction groove | channel and resistance value of What investigated the relationship is shown in FIG. This resistance value is set by applying a four-terminal digital multimeter measurement terminal to the electrode terminals at the corners of each resistor and measuring the current and voltage while measuring the current from one end of the resistor toward the center. The resistance value correction groove is cut using a laser beam in the direction in which the gas flows, and when the target resistance value is reached, the cutting is stopped to obtain a desired resistance value.
[0029]
In FIG. 6 shows the values of the resistors in the second embodiment of the linear resistors according to the first embodiment of the present invention, the curve of (2) the present invention (1).
[0030]
The linear resistor of (1) shows a descending characteristic that the resistance value decreases as the area of the resistor in which the voltage drop is detected is large and the length of the resistance value correcting groove becomes longer. This has the effect that the lowering ratio of the resistance value can be increased and the resistance value can be set in a wider range.
[0031]
In addition, in the resistor of the curve of (2), since the resistance value correction groove is provided at equal intervals from the opposing electrode terminal, the area of the resistor where the voltage drop is detected is smaller than that of (1), and the resistance The value rises. For this reason, the resistance value does not drop abruptly, and even if the length of the resistance correction groove is increased, the resistance value is affected. Adjustment is easy and the correction accuracy of the resistance value is improved.
[0032]
【The invention's effect】
As described above, according to the present invention, it is possible to provide a highly reliable resistor that can cope with a low resistance value by lowering the resistance value in the resistance value correcting groove by trimming.
[Brief description of the drawings]
Perspective view of the resistor in the first embodiment of the invention, FIG 2 shows (a) ~ views illustrating a method of manufacturing a (c) the resistors Figure 3 (a) ~ (c) the plan view of the resistor in the process diagram plan view of a resistor according to another embodiment of the present invention; FIG 5 shows a second embodiment of the present invention showing a manufacturing method of the resistor 6 present invention The figure which shows the relationship between the length of the resistance value correction groove | channel of a resistor and resistance value in Embodiment 1 and 2 of FIG. 7 [FIG. 7] The top view of the conventional resistor [FIG. Figure showing the relationship with values [Explanation of symbols]
11 Insulating substrate 12 Electrode terminal 13 Resistor 14 Resistance value correction groove

Claims (1)

A rectangular insulating substrate; four electrode terminals provided at four corners of the insulating substrate; a resistor provided on the upper surface of the insulating substrate so as to be electrically connected to the four electrode terminals ; and the resistor A resistance value correction groove provided in a direction in which a current flows from one end to the center of the four electrode terminals, and one of the four electrode terminals opposed across the resistance value correction groove is a voltage. A resistor in which the other two electrode terminals are current terminals, and the resistance correction groove exhibits a descending characteristic in which the resistance value decreases as the length increases.

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