JP2021136365A - Chip resistor - Google Patents

Abstract

To provide a chip resistor capable of performing precise correction used for various electronic devices.SOLUTION: A chip resistor has extension parts 29, 31 extending toward electrodes 22, 23 respectively on tips of L-shaped trimming parts 28 and 30 which are formed along with a connection part with electrodes 22 and 23 of a resistor 24. The chip resistor is configured to improve correction accuracy of resistance value by using changes in current density with respect to the electrodes 22 and 23.SELECTED DRAWING: Figure 1

Description

The present invention relates to chip resistors used in various electronic devices.

The conventional chip resistor will be described below with reference to the drawings.

FIG. 6 is a top view of a conventional chip resistor.

In FIG. 6, reference numeral 1 denotes an insulating substrate made of alumina, and the planar shape of the insulating substrate 1 is rectangular. A first electrode 2 and a second electrode 3 are provided on both ends of the surface of the insulating substrate 1, respectively. Further, a resistor 4 is provided so as to be electrically connected between the first electrode 2 and the second electrode 3, and the resistor 4 is connected to the first electrode 2. A rectangular portion 5 of 1 is provided, and a second rectangular portion 6 connected to the second electrode 3 is provided. A substantially S-shaped portion 7 that is located between the first rectangular portion 5 and the second rectangular portion 6 and is not trimmed is provided. The resistor 4 is configured to be folded back in a direction substantially parallel to the longitudinal direction of the insulating substrate 1. The first rectangular portion 5 is provided with a first L-shaped trimming portion 8 in close proximity to the first electrode 2, and the tip of the first L-shaped trimming portion 8 is on the side of the first electrode 2. A first stretching portion 9 for stretching toward the opposite side is provided. Similarly, the second rectangular portion 6 is provided with the second L-shaped trimming portion 10 in the vicinity of the second electrode 3, and the second electrode is provided at the tip of the second L-shaped trimming portion 10. A second stretching portion 11 that stretches toward the opposite side of 3 is provided.

Here, as shown in FIG. 7, in the case where the second stretched portion 11 is stretched toward the side opposite to the second electrode 3, the trimmable region of the resistor 4 is set to 100% as shown in the triangular plot. The amount of correction of the resistance value with respect to the trimming length of the case was measured. For example, when trimming was performed by about 5% of the trimmable area, the change was always 0.9%, and the amount of correction of the resistance value was large.

As the prior art document information regarding the invention of this application, for example, Patent Document 1 is known.

JP-A-2019-16643

However, in the above-mentioned conventional configuration, since the second stretched portion 11 of the second L-shaped trimming portion 10 is stretched toward the side opposite to the second electrode 3, the second stretched portion 11 is sequentially stretched according to the trimming amount. The cross-sectional area of the rectangular portion 6 becomes small, and as a result, the amount of correction of the resistance value becomes large, but there is a problem that high-precision correction cannot be performed.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a chip resistor capable of highly accurate correction.

The invention according to claim 1 of the present invention includes an insulating substrate, a pair of electrodes provided at both ends of the upper surface of the insulating substrate, and provided between the pair of electrodes provided on the upper surface of the insulating substrate. The resistor is folded back in a direction substantially perpendicular to the longitudinal direction of the insulating substrate, and the tip of an L-shaped trimming portion provided along the connection portion of the resistor with the electrode is provided. A stretched portion that stretches toward the electrode side is provided. According to this configuration, since the stretched portion that stretches the tip of the L-shaped trimming portion toward the electrode side is provided, the change in current density with respect to the electrode is utilized. By doing so, it has the effect of improving the accuracy of the correction of the resistance value.

The invention according to claim 2 of the present invention particularly comprises providing an R portion at a connecting portion that extends the tip of the L-shaped trimming portion toward the electrode side, and according to this configuration, the L-shaped trimming portion is provided. It is possible to prevent the concentration of the current load generated at the root of the stretched portion, and as a result, it is possible to prevent the heat generation due to the current load generated at the time of mounting the product.

The invention according to claim 3 of the present invention includes an insulating substrate, a pair of electrodes provided at both ends of the upper surface of the insulating substrate, and provided between the pair of electrodes provided on the upper surface of the insulating substrate. The resistor is folded back in a direction substantially parallel to the longitudinal direction of the insulating substrate, and the tip of an L-shaped trimming portion provided along the connection portion of the resistor with the electrode is provided. A stretched portion that stretches toward the electrode side is provided. According to this configuration, since the stretched portion that stretches the tip of the L-shaped trimming portion toward the electrode side is provided, the change in current density with respect to the electrode is utilized. By doing so, it has the effect of improving the accuracy of the correction of the resistance value.

The chip resistor of the present invention is an insulating substrate, a pair of electrodes provided at both ends of the upper surface of the insulating substrate, and a resistor provided on the upper surface of the insulating substrate and between the pair of electrodes. The resistor is folded back in a direction substantially perpendicular to the longitudinal direction of the insulating substrate, and the tip of an L-shaped trimming portion provided along the connection portion of the resistor with the electrode is directed toward the electrode side. According to this configuration, since the stretched portion for stretching the tip of the L-shaped trimming portion toward the electrode side is provided, the change in the current density with respect to the electrode can be utilized. It has the effect of being able to provide a chip resistor capable of highly accurate correction.

Top view of the chip resistor according to the first embodiment of the present invention Top view showing a state in which the tip of the L-shaped trimming portion is stretched toward the side opposite to the electrode side in the chip resistor. The figure which shows the resistance value trimming operation state of the chip resistor in Embodiment 1 of this invention. Top view of the chip resistor described in the first embodiment of the present invention. Top view of the chip resistor according to the second embodiment of the present invention Top view of a conventional chip resistor The figure which shows the resistance value trimming operation state of the conventional chip resistor

(Embodiment 1)
Hereinafter, the chip resistor according to the first embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a top view of the chip resistor according to the first embodiment of the present invention.

Reference numeral 21 denotes an insulating substrate made of alumina, and the planar shape of the insulating substrate 21 is rectangular, and its external dimensions are 2012 size (2.0 mm × 1.25 mm).

A first electrode 22 and a second electrode 23 are provided on both ends of the surface of the insulating substrate 21, respectively. Further, a resistor 24 is provided so as to be electrically connected between the first electrode 22 and the second electrode 23, and the resistor 24 is connected to the first electrode 22. A rectangular portion 25 of 1 is provided, and a second rectangular portion 26 connected to the second electrode 23 is provided. A substantially S-shaped portion 27 that is located between the first rectangular portion 25 and the second rectangular portion 26 and is not trimmed is provided. The resistor 24 is configured to be folded back in a direction substantially perpendicular to the longitudinal direction of the insulating substrate 21. The first rectangular portion 25 is provided with a first L-shaped trimming portion 28 in close proximity to the first electrode 22, and the first electrode 22 side is provided at the tip of the first L-shaped trimming portion 28. A first stretching portion 29 for stretching toward is provided. Similarly, the second rectangular portion 26 is provided with a second L-shaped trimming portion 30 in close proximity to the second electrode 23, and the second electrode is provided at the tip of the second L-shaped trimming portion 30. A second stretching portion 31 that stretches toward the 23 side is provided.

Further, on the back surface of the insulating substrate 21, a pair of back surface electrodes (not shown) provided so as to have a predetermined interval are provided.

Further, on the outer surface of the insulating substrate 21 in the longitudinal direction, an end face electrode (not shown) for electrically connecting the first electrode 22 and the back surface electrode (not shown) is provided. Similarly, an end face electrode (not shown) is provided so as to electrically connect the second electrode 23 and the back surface electrode (not shown).

Next, a method for manufacturing a chip resistor according to the first embodiment of the present invention will be described.

First, electrode paste is screen-printed on both ends of an insulating substrate 21 made of alumina, and this is fired at 850 ° C. to form a first electrode 22 and a second electrode 23.

Next, a resistance paste is screen-printed between the first electrode 22 and the second electrode 23, and this is fired at 850 ° C. to form a resistor 24.

The resistor 24 has a first rectangular portion 25 electrically connected to the first electrode 22, a second rectangular portion 26 electrically connected to the second electrode 23, and a substantially non-trimming process. It is composed of an S-shaped portion 27.

With this configuration, the initial length of the resistor does not change even if the position of the resistor 24 shifts in the longitudinal direction of the chip resistor due to the position shift during screen printing, and the first one. A margin can be obtained at a position where the L-shaped trimming portion 28 and the second L-shaped trimming portion 30 are provided.

Next, in order to correct the resistance value by laser trimming, the straight lines 28a and 30a of the first L-shaped trimming section 28 and the second L-shaped trimming section 30 provided at both ends are trimmed. Since the length of the resistor 24 becomes longer, the surge characteristics can be made even better, and the formation of the linear portions 28a and 30a roughly corrects the resistance value.

Further, since the first rectangular portion 25 and the second rectangular portion 26 can be trimmed, the correction magnification of the resistance value can be increased.

Next, in order to correct the resistance value with high accuracy by laser trimming, the straight line from the bent portions 28c and 30c in the first L-shaped trimming portion 28 and the second L-shaped trimming portion 30 provided at both ends. The first stretched portion 29 is formed so as to stretch toward the first electrode 22 and the second stretched portion 31 is stretched toward the second electrode 23 in the direction perpendicular to the portions 28a and 30a.

Here, as shown in FIG. 2, the first stretched portion 29 of the first L-shaped trimming portion 28 is stretched toward the side opposite to the first electrode 22, and the second L-shaped trimming portion is stretched. Consider a case where the second stretched portion 31 of No. 30 is stretched toward the side opposite to the first electrode 22.

As shown in the triangular plot of FIG. 3, the cross-sectional area of the current path in the first rectangular portion 25 and the second rectangular portion 26 becomes smaller according to the trimming amount, and the resistance value fluctuates significantly.

On the other hand, in the chip resistor according to the first embodiment of the present invention, the first stretched portion 29 of the first L-shaped trimming portion 28 is stretched toward the first electrode 22, and the second L-shaped trimming portion 28 is stretched toward the first electrode 22. The second stretched portion 31 of the shape trimming portion 30 is stretched toward the second electrode 23.

Then, by utilizing the change in the current density with respect to the first electrode 22 and the second electrode 23 as shown in the circle plot of FIG. 3, the amount of change in the resistance value due to the trimming length of the resistance value gradually decreases, so that the resistance It has the effect of improving the accuracy of value correction.

In the chip resistor according to the first embodiment of the present invention, the bent portions 28c and 30c are sharp right angles, but as shown in FIG. 4, the tip of the first L-shaped trimming portion 28 is the first. The R portion 28d may be provided at the connecting portion extending toward the electrode 22 side of the above, and the R portion 30d may be provided at the connecting portion extending the tip of the second L-shaped trimming portion 30 toward the second electrode 23 side. Is.

Then, the R portion 28d is provided at the connecting portion that extends the tip of the first L-shaped trimming portion 28 toward the first electrode 22, and the tip of the second L-shaped trimming portion 30 is provided at the second electrode 23. In order to provide the R portion 30d at the connecting portion to be stretched to the side, at the root of the first stretching portion 29 in the first L-shaped trimming portion 28 and the second stretching portion 31 in the second L-shaped trimming portion 30. It is possible to prevent the concentration of the load of the generated current, and as a result, it is possible to prevent the heat generation due to the current load generated at the time of product mounting, which has the effect of being able to be prevented.

(Embodiment 2)
Hereinafter, the chip resistor according to the second embodiment of the present invention will be described with reference to the drawings.

Here, the same items as those in FIG. 1 of the first embodiment are assigned the same numbers, and detailed description thereof will be omitted.

FIG. 5 is different from FIG. 1 of the first embodiment in that the resistor 34 is folded back in a direction substantially parallel to the longitudinal direction of the insulating substrate 21.

In the chip resistor according to the second embodiment of the present invention, the first stretched portion 29 of the first L-shaped trimming portion 28 is stretched toward the first electrode 22, and the second L-shaped trimming portion is trimmed. The second stretched portion 31 of the portion 30 is stretched toward the second electrode 23.

Then, by utilizing the change in the current density with respect to the first electrode 22 and the second electrode 23 as in the circle plot of FIG. 7, the amount of change in the resistance value due to the trimming length of the resistance value is gradually reduced. , It has the effect of improving the accuracy of the correction of the resistance value.

Since the chip resistor of the present invention can provide a chip resistor capable of high-precision correction, it is useful as a chip resistor used in various electronic devices.

21 Insulated substrate 22 First electrode 23 Second electrode 24, 34 Resistor 28 First L-shaped trimming part 30 Second L-shaped trimming part 28d, 30d R part 29 First stretched part 31 Second Stretched part of

Claims (3)

The insulating substrate, a pair of electrodes provided at both ends of the upper surface of the insulating substrate, and provided on the upper surface of the insulating substrate so as to be electrically connected to each electrode between the pair of electrodes. The resistor is folded back in a direction substantially perpendicular to the longitudinal direction of the insulating substrate, and the tip of an L-shaped trimming portion provided along the connection portion of the resistor with the electrode is an electrode. A chip resistor provided with a stretched portion that stretches toward the side. The chip resistor according to claim 1, wherein an R portion is provided at a connecting portion that extends the tip of the L-shaped trimming portion toward the electrode side. The insulating substrate, a pair of electrodes provided at both ends of the upper surface of the insulating substrate, and provided on the upper surface of the insulating substrate so as to be electrically connected to each electrode between the pair of electrodes. The resistor is folded back in a direction substantially parallel to the longitudinal direction of the insulating substrate, and the tip of an L-shaped trimming portion provided along the connection portion of the resistor with the electrode is an electrode. A chip resistor provided with a stretched portion that stretches toward the side.

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