Chip resistor

Abstract

A resistive element of this chip resistor has a first trimming groove and a second trimming groove formed therein. A first end of the first trimming groove is located at a third edge of the resistive element, and a second end of the first trimming groove is located at a position closer to a fourth edge of the resistive element and closer to a first electrode than the position of the first end. The first trimming groove has a shape extending from the first end toward the fourth edge and further extending toward the second end. A third end of the second trimming groove is located at the third edge of the resistive element, at a position closer to a second edge than the first end, and a fourth end of the second trimming groove is located at a position closer to the fourth edge and closer to a second electrode than the position of the third end. The second trimming groove has a shape extending from the third end toward the fourth edge and further extending toward the fourth end.

Description

Chip Resistors

[0001] The present disclosure relates generally to chip resistors, and more particularly to chip resistors having a resistive body with trimming grooves.

[0002] Patent Document 1 discloses a chip resistor having a substrate, a resistor, and electrodes formed on both sides of the resistor, and at least a first trimming groove and a second trimming groove are formed in the resistor, and the first trimming groove and the second trimming groove each have a vertical groove extending in the inter-electrode direction from one end edge of the resistor facing each other in a direction perpendicular to the inter-electrode direction, and a horizontal groove extending from the vertical groove and bending in the inter-electrode direction, and the first vertical groove of the first trimming groove and the second vertical groove of the second trimming groove are formed with a gap in the inter-electrode direction, and the first horizontal groove of the first trimming groove and the second horizontal groove of the second trimming groove extend in directions approaching each other, and the respective ends of the first horizontal groove and the second horizontal groove are formed apart in the inter-electrode direction so as not to overlap in the perpendicular direction.

[0003] Patent Document 1 describes that the chip resistor can disperse hot spots and reduce adverse effects on characteristics caused by microcracks.

[0004] Japanese Patent Application Laid-Open No. 2019-169598

[0005] A chip resistor according to one aspect of the present disclosure includes a substrate having a support surface, a first electrode and a second electrode disposed at opposite ends of the substrate in one direction along the support surface, and a resistor disposed on the support surface of the substrate from the first electrode to the second electrode. The resistor has a first edge that is an edge facing the first electrode, a second edge that is an edge facing the second electrode, a third edge, and a fourth edge that is an edge opposite the third edge, the third edge and the fourth edge being aligned in a direction along the support surface and intersecting the alignment direction of the first edge and the second edge. The resistor has a first trimming groove and a second trimming groove formed in the resistor. The first trimming groove has a first end and a second end, the first end is located on the third edge, the second end is located closer to the fourth edge and the first electrode than the first end, the first trimming groove has a shape that extends from the first end to the fourth edge and further toward the second end.The second trimming groove has a third end and a fourth end, the third end is located on the third edge closer to the second edge than the first end, the fourth end is located closer to the fourth edge and the second electrode than the third end, the second trimming groove has a shape that extends from the third end to the fourth edge and further toward the fourth end.

[0006] According to the present disclosure, it is possible to improve the reliability of a chip resistor having a resistor element with a trimming groove.

[0007] FIG. 1 is a cross-sectional view of a chip resistor according to a first embodiment. FIG. 2 is a plan view of the same chip resistor. FIG. 3 is a diagram showing a simulation result of the electric field distribution of the chip resistor according to the first embodiment. FIG. 4 is a diagram showing a simulation result of the heat generation density distribution of the chip resistor according to the first embodiment. FIG. 5 is a diagram showing a simulation result of the electric field distribution of a comparative chip resistor. FIG. 6 is a diagram showing a simulation result of the heat generation density distribution of a comparative chip resistor. FIG. 7 is a plan view of a chip resistor according to a second embodiment. FIG. 8 is a diagram showing a simulation result of the electric field distribution of the chip resistor according to the second embodiment. FIG. 9 is a diagram showing a simulation result of the heat generation density distribution of the chip resistor according to the second embodiment. FIG. 10 is a plan view of a chip resistor according to a third embodiment. FIG. 11 is a diagram showing a simulation result of the electric field distribution of the chip resistor according to the third embodiment. FIG. 12 is a diagram showing a simulation result of the heat generation density distribution of the chip resistor according to the third embodiment. FIG. 13 is a plan view of a chip resistor according to a fourth embodiment. Fig. 14 is a diagram showing a simulation result of the electric field distribution of the chip resistor of the fourth embodiment, Fig. 15 is a diagram showing a simulation result of the heat generation density distribution of the chip resistor of the fourth embodiment, and Fig. 16 is a plan view of the chip resistor of the fifth embodiment.

[0008] The chip resistor 1 according to the embodiments and modifications will be described below with reference to the drawings. The figures described in the following embodiments and modifications are schematic diagrams, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Furthermore, the configurations described in the following embodiments and modifications are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments and modifications, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved. Furthermore, various modifications are possible, such as combining the configurations of the examples and the modifications.

[0009] 1. Overview Generally, when a resistor in a chip resistor has a trimming groove, the resistor may not exhibit the electrical characteristics, such as the electrical resistance value, as designed. The reason for this is that the formation of the trimming groove causes the electric field density within the resistor to become non-uniform, which results in excessive heat generation locally around the trimming groove. In particular, when forming the trimming groove, microcracks are likely to occur in the resistor near the tip of the trimming groove, and excessive heat generation at the location of these microcracks significantly affects the electrical resistance value.

[0010] For example, Patent Document 1 (JP 2019-169598 A) describes that the first vertical groove of the first trimming groove and the second vertical groove of the second trimming groove are formed with a gap in the inter-electrode direction, and the first horizontal groove of the first trimming groove and the second horizontal groove of the second trimming groove extend in directions approaching each other, and the ends of the first horizontal groove and the second horizontal groove are formed apart in the inter-electrode direction so as not to overlap in the perpendicular direction, thereby reducing the adverse effects on characteristics caused by microcracks.

[0011] However, the inventors have continued research and development to further reduce the adverse effects on the characteristics of the resistor caused by localized excessive heat generation in the resistor, thereby further improving the reliability of chip resistors, and have completed the present disclosure.

[0012] An overview of a chip resistor 1 according to an embodiment will be described (see FIGS. 1 and 2). FIG. 1 is a cross-sectional view of the chip resistor 1. FIG. 2 is a plan view of the chip resistor 1. FIG. 1 shows a cross section of the chip resistor taken along line II in FIG. 2.

[0013] The chip resistor 1 includes a substrate 2, a first electrode 31, a second electrode 32, and a resistor 5. The substrate 2 has a support surface 21. The first electrode 31 and the second electrode 32 are respectively disposed at both ends of the substrate 2 in one direction along the support surface 21. The resistor 5 is disposed on the support surface 21 of the substrate 2, spanning from the first electrode 31 to the second electrode 32.

[0014] The resistor 5 has a first edge 53 that is the edge on the first electrode 31 side, a second edge 54 that is the edge on the second electrode 32 side, a third edge 51, and a fourth edge 52 that is the edge opposite to the third edge 51. The third edge 51 and the fourth edge 52 are aligned in a direction that intersects with the alignment direction of the first edge 53 and the second edge 54 and that is along the support surface 21. The resistor 5 is electrically connected to the first electrode 31 and the second electrode 32.

[0015] The resistor 5 is formed with a first trimming groove 11 and a second trimming groove 12. The first trimming groove 11 and the second trimming groove 12 penetrate the resistor 5 in the Z direction. The first trimming groove 11 has a first end 111 and a second end 112, and extends in an elongated shape from the first end 111 to the second end 112. The first end 111 is located at the third edge 51, and the second end 112 is located closer to the fourth edge 52 and the first electrode 31 than the first end 111. The first trimming groove 11 extends from the first end 111 toward the fourth edge 52 and further toward the second end 112. The second trimming groove 12 has a third end 121 and a fourth end 122, and extends in an elongated shape from the third end 121 to the fourth end 122. The third end 121 is located closer to the second edge 54 than the first end 111 on the third edge 51. The fourth end 122 is located closer to the fourth edge 52 and the second electrode 32 than the third end 121. The second trimming groove 12 extends from the third end 121 toward the fourth edge 52 and further toward the fourth end 122.

[0016] The resistor 5 has the first trimming groove 11 and the second trimming groove 12, which adjusts the electrical resistance between the first electrode 31 and the second electrode 32 in the resistor 5. In other words, the first trimming groove 11 and the second trimming groove 12 are formed so that the electrical resistance is as designed.

[0017] Furthermore, according to the embodiment, when a voltage is applied between the first electrode 31 and the second electrode 32 and a current flows through the resistor 5, causing the resistor 5 to heat up, localized excessive heat generation around the first trimming groove 11 and the second trimming groove 12 can be suppressed. This can reduce the impact of heat generation in the resistor 5 on the electrical characteristics of the resistor 5. This can improve the reliability of the chip resistor 1.

[0018] 2.1. First Embodiment The chip resistor 1 according to the first embodiment will be described in detail with reference to FIGS. 1 and 2.

[0019] In the following description, the direction in which the first edge 53 and the second edge 54 of the resistor 5 are aligned is referred to as the X direction, the direction in which the third edge 51 and the fourth edge 52 of the resistor 5 are aligned is referred to as the Y direction, and the direction perpendicular to the support surface 21 of the substrate 2 is referred to as the Z direction. In the embodiment, the X direction and the Y direction are perpendicular to each other, i.e., the direction in which the first edge 53 and the second edge 54 are aligned is perpendicular to the direction in which the third edge 51 and the fourth edge 52 are aligned. The Z direction is perpendicular to both the X direction and the Y direction. Note that the term "perpendicular" in the present disclosure is a concept that includes approximately perpendicular, and includes a range of at least 90°±10°.

[0020] (1) Basic Configuration of Chip Resistor 1 The chip resistor 1 is a chip resistor for surface mounting (SMT: Surface Mount Technology) that is mounted on the surface (mounting surface) of a printed circuit board using, for example, a surface mounter. The chip resistor 1 is, for example, a thick-film chip resistor.

[0021] 1 and 2 , the chip resistor 1 includes a substrate 2, a first electrode 31, a second electrode 32, and a resistor 5. Each of the first electrode 31 and the second electrode 32 includes an upper electrode 33, a lower electrode 34, an end electrode 35, a first plating layer 36, and a second plating layer 37. The chip resistor 1 further includes a glass protective film 41 and a resin protective film 42.

[0022] (2) Substrate 2 The substrate 2 has electrical insulation properties. The substrate 2 is made of, for example, Al. ２ O ３ The alumina substrate contains 96% of

[0023] The substrate 2 is a rectangular plate with its longitudinal direction aligned along the X direction, its lateral direction aligned along the Y direction, and its thickness direction aligned along the Z direction. One of the two surfaces of the substrate 2 aligned in the Z direction is a support surface 21, and the other surface (the surface opposite to the support surface 21) is a back surface 22.

[0024] (3) First Electrode 31 and Second Electrode 32 The first electrode 31 and the second electrode 32 are provided at both ends in the X direction of the substrate 2. As described above, each of the first electrode 31 and the second electrode 32 includes an upper electrode 33, a lower electrode 34, an end electrode 35, a first plating layer 36, and a second plating layer 37.

[0025] The upper surface electrode 33 is provided on an end portion in the X direction of the support surface 21 of the substrate 2. The upper surface electrode 33 is formed by printing a thick film material containing a metal such as silver as a main material on the support surface 21 and then firing the printed material.

[0026] 2, the lower electrode 34 is provided at an end in the X direction on the surface of the substrate 2 opposite the support surface 21 (hereinafter also referred to as the back surface 22). The lower electrode 34 is formed by printing a thick film material containing a metal such as silver as a main component on the back surface 22 and then firing the printed material. The lower electrode 34 is provided at a position corresponding to the upper electrode 33 in the Z direction.

[0027] 2 , the edge electrode 35 is provided on the side surface 23 of the substrate 2 in the X direction. In each of the first electrode 31 and the second electrode 32, the edge electrode 35 electrically connects the upper electrode 33 and the lower electrode 34. The edge electrode 35 is formed (deposited) by printing a material containing silver and synthetic resin on the side surface 23, for example.

[0028] The first plating layer 36 is made of, for example, nickel plating, and covers the end surface electrodes 35 and 35 at the end of the substrate 2 in the X direction.

[0029] The second plating layer 37 is made of, for example, tin plating and covers the first plating layer 36 at the end of the substrate 2 in the X direction.

[0030] (4) Glass Protective Film The glass protective film 41 is a film for protecting the resistor 5. As shown in FIG. 1, the glass protective film 41 covers the entire resistor 5. The glass protective film 41 is made of, for example, lead oxide glass. The glass protective film 41 is formed (deposited) by, for example, screen printing. Note that the glass protective film 41 is not limited to lead oxide glass, and may be made of, for example, silicate glass. Note that the material and manufacturing method of the glass protective film 41 are not limited to those described above.

[0031] (5) Resin Protective Film The resin protective film 42 is made of, for example, epoxy resin, and covers the entire glass protective film 41. The resin protective film 42 is formed (deposited) by, for example, applying epoxy resin by screen printing and then thermally curing the epoxy resin. Note that the material and manufacturing method of the resin protective film 42 are not limited to those described above.

[0032] (6) Resistor The resistor 5 is a rectangular film with its longitudinal direction aligned with the X direction, its lateral direction aligned with the Y direction, and its thickness direction aligned with the Z direction. The edges of the resistor 5 on both sides in the X direction are a first edge 53 and a second edge 54, and the edges on both sides in the Y direction are a third edge 51 and a fourth edge 52. When the chip resistor 1 is viewed along the Z direction from the support surface 21 side of the substrate 2, the third edge 51, the second edge 54, the fourth edge 52, and the first edge 53 are arranged counterclockwise in this order, but the third edge 51, the second edge 54, the fourth edge 52, and the first edge 53 may also be arranged clockwise in this order.

[0033] The resistor 5 is disposed on the support surface 21 of the substrate 2, spanning from the upper surface electrode 33 of the first electrode 31 to the upper surface electrode 33 of the second electrode 32. The portion of the resistor 5 on the first edge 53 side is overlapped so as to contact the portion of the upper surface electrode 33 of the first electrode 31 on the second electrode 32 side, thereby electrically connecting to the first electrode 31. The portion of the resistor 5 on the second edge 54 side is overlapped so as to contact the portion of the upper surface electrode 33 of the second electrode 32 on the first electrode 31 side, thereby electrically connecting to the second electrode 32.

[0034] The resistor 5 is formed by printing a thick film material made of, for example, about 10 wt % lead ruthenate, about 53 wt % glass, and about 37 wt % solvent on the support surface 21 of the substrate 2, and then baking the printed material. Note that the material and manufacturing method of the resistor 5 are not limited to those described above.

[0035] 1, the resistor 5 has a first trimming groove 11 and a second trimming groove 12 aligned in the X direction. The second trimming groove 12 is located on the second electrode 32 side in the X direction relative to the first trimming groove 11.

[0036] The opposite ends of the first trimming groove 11 are referred to as a first end 111 and a second end 112, respectively. That is, the first trimming groove 11 has the first end 111 and the second end 112. The first end 111 is located at the third edge 51. That is, the first trimming groove 11 opens outward in the Y direction at the third edge 51 of the resistor 5. The second end 112 is located between the first edge 53 and the second edge 54 of the resistor 5 and between the third edge 51 and the fourth edge 52, and is located closer to the fourth edge 52 and the first electrode 31 than the first end 111 is. The first trimming groove 11 has a shape that extends from the first end 111 toward the fourth edge 52 and further toward the second end 112.

[0037] Specifically, first trimming groove 11 has a first linear portion 113 that includes first end 111 and extends linearly along the direction in which third edge 51 and fourth edge 52 are aligned (Y direction), a second linear portion 114 that includes second end 112 and extends linearly along the direction in which first edge 53 and second edge 54 are aligned (X direction), and an arc-shaped curved portion 115 that connects first linear portion 113 and second linear portion 114. Note that the arc shape includes not only an exact arc, but also shapes similar to an arc, such as a slightly distorted arc, an elliptical arc, and a parabola.

[0038] The opposite ends of the second trimming groove 12 are referred to as a third end 121 and a fourth end 122, respectively. That is, the second trimming groove 12 has the third end 121 and the fourth end 122. The third end 121 is located at the third edge 51. That is, the second trimming groove 12 opens outward in the Y direction at the third edge 51 of the resistor 5. The fourth end 122 is located between the first edge 53 and the second edge 54 of the resistor 5, and between the third edge 51 and the fourth edge 52, and is closer to the fourth edge 52 and the second electrode 32 than the third end 121.

[0039] Specifically, second trimming groove 12 has a first linear portion 123 that includes third end 121 and extends linearly along the direction in which third edge 51 and fourth edge 52 are aligned (Y direction), a second linear portion 124 that includes fourth end 122 and extends linearly along the direction in which first edge 53 and second edge 54 are aligned (X direction), and an arc-shaped curved portion 125 that connects first linear portion 123 and second linear portion 124. Note that the arc shape includes not only an exact arc, but also shapes similar to an arc, such as a slightly distorted arc, an elliptical arc, and a parabola.

[0040] When the chip resistor 1 is viewed in the Z direction from the support surface 21 side, the second end 112 of the first trimming groove 11 is located closer to the second edge 54 than the first edge 53, and there is a gap between the second end 112 and the first electrode 31 in the direction (X direction) in which the first electrode 31 and the second electrode 32 are aligned. Furthermore, when the chip resistor 1 is viewed in the Z direction from the support surface 21 side, the fourth end 122 of the second trimming groove 12 is located closer to the first edge 53 than the second edge 54, and there is a gap between the fourth end 122 and the second electrode 32 in the direction (X direction) in which the first edge 53 and the second edge 54 are aligned.

[0041] The length of second trimming groove 12 is preferably equal to or less than the length of first trimming groove 11. In the first embodiment, the length of second trimming groove 12 is shorter than the length of first trimming groove 11. The dimension of second trimming groove 12 in the X direction is shorter than the dimension of first trimming groove 11 in the X direction, and the dimension of second trimming groove 12 in the Y direction is shorter than the dimension of first trimming groove 11 in the Y direction.

[0042] (7) Manufacturing Method An example of a method for manufacturing the chip resistor 1 will be described, particularly a method for manufacturing the upper surface electrode 33 and the resistor element 5. However, the manufacturing method for the chip resistor 1 is not limited to the following method.

[0043] An electrode paste is screen-printed on both ends in the X direction of the support surface 21 of the substrate 2 and then fired at 850° C. to form the upper surface electrodes 33 of the first electrode 31 and the upper surface electrodes 33 of the second electrode 32 .

[0044] Next, a resistive paste is screen-printed between the upper electrode 33 of the first electrode 31 and the upper electrode 33 of the second electrode 32, and then fired at 850° C. to form the resistor 5.

[0045] Next, the first trimming groove 11 and the second trimming groove 12 are formed in the resistor 5 by laser processing.

[0046] The first trimming groove 11 and the second trimming groove 12 can be used to adjust the electrical characteristics, such as the electrical resistance value, of the resistor 5 as designed. In this case, for example, the first trimming groove 11 is first formed so that the electrical resistance value of the resistor 5 is slightly smaller than the design value. Next, the second trimming groove 12 is formed so that the electrical resistance value of the resistor 5 is the design value. In this case, the dimensions of the second trimming groove 12 are equal to or smaller than the dimensions of the first trimming groove 11. In this way, the electrical resistance value of the resistor 5 is adjusted to a certain extent by first forming the first trimming groove 11, and then the second trimming groove 12 is formed to finely adjust the electrical resistance value of the resistor 5, thereby enabling the electrical resistance value of the resistor 5 to be adjusted with high precision.

[0047] (8) Operation According to the first embodiment, when a voltage is applied between the first electrode 31 and the second electrode 32 of the chip resistor 1 and a current flows through the resistor 5, localized excessive heat generation around the first trimming groove 11 and the second trimming groove 12 of the resistor 5 is suppressed. The reason for this is believed to be as follows.

[0048] By forming the first trimming groove 11 and the second trimming groove 12 in the resistor 5, the locations of high heat generation are dispersed in the resistor 5, thereby suppressing a local increase in heat generation. Furthermore, while an electric field tends to concentrate near the tips of the trimming grooves, which tends to increase the amount of heat generation, the portion of the first trimming groove 11 on the second end 112 side extends toward the first edge 53 of the resistor 5, and the portion of the second trimming groove 12 on the fourth end 122 side extends toward the second edge 54 of the resistor 5. This makes it easier for heat generated near the second end 112 of the first trimming groove 11 and the fourth end 122 of the second trimming groove 12 to be released from the resistor 5. This can suppress localized excessive heat generation near the second end 112 and the fourth end 122 of the resistor 5.

[0049] Furthermore, microcracks may occur in the resistor 5 near the second end 112 of the first trimming groove 11 and near the fourth end 122 of the second trimming groove 12. However, in the first embodiment, excessive heat generation near the second end 112 and near the fourth end 122 is suppressed, and therefore the adverse effect of microcracks on the electrical resistance value of the resistor 5 can be reduced.

[0050] Furthermore, because first trimming groove 11 has arc-shaped curved portion 115, electric field concentration is suppressed at locations where a change occurs in the direction of extension of first trimming groove 11. This also suppresses localized excessive heat generation. Because second trimming groove 12 also has arc-shaped curved portion 125, electric field concentration is suppressed at locations where a change occurs in the direction of extension of second trimming groove 12. This also suppresses localized excessive heat generation.

[0051] This suppresses adverse effects on the electrical resistance value of the resistor 5 due to localized excessive heat generation, and improves the reliability of the chip resistor 1.

[0052] The above-mentioned effects are confirmed from the results of a simulation using the finite element method for the electric field distribution and heat density distribution when a current is applied to the chip resistor 1 of the first embodiment.

[0053] The simulation was performed under the following assumptions: dimensions of resistor 5: X-direction dimension 1.35 mm, Y-direction dimension 0.80 mm, Z-direction dimension (thickness) 0.01 mm; dimensions of first trimming groove 11: X-direction dimension 0.385 mm, Y-direction dimension 0.40 mm, radius of curvature of curved portion 115 0.2 mm; position of first trimming groove 11: X-direction dimension between second end 112 and first edge 53 of resistor 5 0.165 mm; X-direction dimension between second end 112 and the edge of first electrode 31 0.065 mm; dimensions of second trimming groove 12: X-direction dimension 0.235 mm, Y-direction dimension 0.20 mm, radius of curvature of curved portion 125 0.1 mm; position of second trimming groove 12: X-direction dimension between fourth end 122 and second edge 54 of resistor 5 0.165 mm. The dimension in the X direction between the fourth end 122 and the edge of the second electrode 32 is 0.065 mm.

[0054] The results of the simulation of the electric field distribution are shown in FIG. 3, and the results of the simulation of the heat density distribution are shown in FIG.

[0055] Regarding the electric field distribution, the electric field tended to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and the electric field tended to be particularly high on the side of the first trimming groove 11. The electric field was highest near the second end 112 of the first trimming groove 11, and its value was 117.876 kV / m.

[0056] Similarly, the heat generation distribution showed a tendency for the heat generation density to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and particularly on the side of the first trimming groove 11. The heat generation density was highest near the second end 112 of the first trimming groove 11, with a value of 243.769 GW / m ３ Near the fourth end 122 of the second trimming groove 12, there was also a point where the heat density was locally high.

[0057] As described above, although the first trimming groove 11 and the second trimming groove 12 cause the electric field distribution and the heat density distribution in the resistor 5 to be non-uniform, local excessive increases are suppressed. Furthermore, it can be determined that excessive increases in heat density are suppressed around the arc-shaped curved portion 115 in the first trimming groove 11 and around the arc-shaped curved portion 125 in the second trimming groove 12.

[0058] For comparison, the results of a simulation using the finite element method of the electric field distribution and heat density distribution when a current is passed through a chip resistor 1 different from that of the embodiment are shown.

[0059] The chip resistor 1 for comparison corresponds to a resistor in which the second straight portions 114, 124 of the first trimming groove 11 and the second trimming groove 12 in the embodiment extend in the opposite direction. However, the first trimming groove 11 and the second trimming groove 12 are L-shaped and do not have the curved portions 115, 125. The straight portion 114 is directly connected to the straight portion 113 at the vertex 116, and the straight portion 124 is directly connected to the straight portion 123 at the vertex 126.

[0060] The simulation was performed under the following assumptions: Dimensions of resistor 5: X-direction dimension 1.35 mm, Y-direction dimension 0.80 mm, Z-direction dimension (thickness) 0.01 mm. Dimensions of first trimming groove 11: X-direction dimension 0.385 mm, Y-direction dimension 0.40 mm. Position of first trimming groove 11: X-direction dimension between first trimming groove 11 and first edge 53 of resistor 5: 0.165 mm. X-direction dimension between first trimming groove 11 and the edge of first electrode 31: 0.065 mm. Dimensions of second trimming groove 12: X-direction dimension 0.235 mm, Y-direction dimension 0.20 mm. Position of second trimming groove 12: X-direction dimension between second trimming groove 12 and second edge 54 of resistor 5: 0.165 mm. X-direction dimension between first trimming groove 11 and the edge of second electrode 32: 0.065 mm.

[0061] The results of the simulation of the electric field distribution for comparison are shown in FIG. 5, and the results of the simulation of the heat density distribution are shown in FIG.

[0062] Regarding the electric field distribution, the electric field tended to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and the electric field tended to be particularly high on the first trimming groove 11 side. The electric field was highest near the second end 112 of the first trimming groove 11, and its value was 183.646 kV / m. Therefore, in the case of the first embodiment, the maximum electric field was reduced by 37.1% compared to the comparative example.

[0063] Similarly, the heat generation distribution showed a tendency for the heat generation density to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and particularly on the first trimming groove 11 side. The heat generation density was highest near the second end 112 of the first trimming groove 11, with a value of 592.976 GW / m ３ As a result, the maximum heat generation density in the first embodiment was reduced by 60.7% compared to the comparative example. Note that points of locally high heat generation density also occurred near the apex 116 of the first trimming groove 11 and near the apex 126 of the second trimming groove 12.

[0064] Based on the above, it can be determined that the chip resistor 1 of the first embodiment has higher reliability than the comparative example.

[0065] 2.2. Second Embodiment The chip resistor 1 according to the second embodiment will be described in detail with reference to FIG.

[0066] The chip resistor 1 according to the second embodiment has the same configuration as that of the first embodiment, except that the shape of the second trimming groove 12 is different from that of the first embodiment.

[0067] In the second embodiment, the second trimming groove 12 has a first linear portion 123 that includes the third end 121 and extends linearly along the direction in which the third edge 51 and the fourth edge 52 are aligned (the Y direction), and a second linear portion 124 that includes the fourth end 122 and extends linearly along the direction in which the first edge 53 and the second edge 54 are aligned (the X direction). The second trimming groove 12 has an L-shape in which the first linear portion 123 and the second linear portion 124 are directly connected at a vertex 126. That is, the second trimming groove 12 has the vertex 126 that is a portion that is bent at a right angle, and the portion between the third end 121 and the vertex 126 is the linear first linear portion 123, and the portion between the vertex 126 and the fourth end 122 is the linear second linear portion 124.

[0068] In the second embodiment, compared to the first embodiment, the second trimming groove 12 does not have a curved portion 125 but has a peak portion 126. Therefore, when forming the second trimming groove 12 to finely adjust the electrical resistance value of the resistor 5, it is easier to improve the accuracy of the dimensions and shape of the second trimming groove 12. As a result, the electrical resistance value of the resistor 5 can be adjusted with greater accuracy. However, when the second trimming groove 12 has a curved portion 125 as in the first embodiment, electric field concentration is suppressed at locations where a change occurs in the extension direction of the second trimming groove 12, and localized excessive heat generation can be further suppressed.

[0069] 10 shows the results of a simulation using the finite element method on the electric field distribution and heat density distribution when a current is applied to the chip resistor 1 of the second embodiment.

[0070] The simulation was performed under the following assumptions. The difference from the first embodiment is that the second trimming groove 12 does not have a curved portion 125 but has a vertex 126. Dimensions of the resistor 5: X-direction dimension 1.35 mm, Y-direction dimension 0.80 mm, Z-direction dimension (thickness) 0.01 mm. Dimensions of the first trimming groove 11: X-direction dimension 0.385 mm, Y-direction dimension 0.40 mm, radius of curvature of the curved portion 115 0.2 mm. Position of the first trimming groove 11: X-direction dimension between the second end 112 and the first edge 53 of the resistor 5 0.165 mm. X-direction dimension between the second end 112 and the edge of the first electrode 31 0.065 mm. Dimensions of the second trimming groove 12: X-direction dimension 0.235 mm, Y-direction dimension 0.20 mm. Position of second trimming groove 12: X-direction dimension between fourth end 122 and second edge 54 of resistor 5: 0.165 mm. X-direction dimension between fourth end 122 and the edge of second electrode 32: 0.065 mm.

[0071] The results of the simulation of the electric field distribution are shown in FIG. 8, and the results of the simulation of the heat density distribution are shown in FIG.

[0072] Regarding the electric field distribution, the electric field tended to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and the electric field tended to be particularly high on the side of the first trimming groove 11. The electric field was highest near the second end 112 of the first trimming groove 11, and its value was 117.316 kV / m.

[0073] Similarly, the heat generation distribution showed a tendency for the heat generation density to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and particularly on the first trimming groove 11 side. The heat generation density was highest near the second end 112 of the first trimming groove 11, with a value of 241.456 GW / m ３ Points where the heat density was locally high also occurred near the fourth end 122 and near the apex 126 of the second trimming groove 12.

[0074] As described above, although the first trimming groove 11 and the second trimming groove 12 cause the electric field distribution and the heat density distribution in the resistor 5 to be non-uniform, local excessive increases are suppressed. Furthermore, it can be determined that excessive increases in heat density are suppressed around the arc-shaped curved portion 115 of the first trimming groove 11.

[0075] 2.3. Third Embodiment The chip resistor 1 according to the third embodiment will be described in detail with reference to FIG.

[0076] The chip resistor 1 according to the third embodiment has the same configuration as that of the first embodiment, except that the shape of the first trimming groove 11 is different from that of the first embodiment.

[0077] In the third embodiment, the first trimming groove 11 has a first straight portion 113 that includes a first end 111 and extends linearly along the direction in which the third edge 51 and the fourth edge 52 are aligned (Y direction), a second straight portion 114 that includes a second end 112 and extends linearly along the direction in which the first edge 53 and the second edge 54 are aligned (X direction), and an arc-shaped curved portion 115 that connects the first straight portion 113 and the second straight portion 114.

[0078] Furthermore, the portion of the first trimming groove 11 on the second end 112 side extends beyond the first edge 53 of the resistor 5 to the first electrode 31 side. That is, the portion of the first trimming groove 11 on the second end 112 side reaches the first electrode 31 and extends further outside than the first edge 53 of the resistor 5. Therefore, the second end 112 of the first trimming groove 11 is located outside the resistor 5. That is, in the resistor 5, the second end 112 of the first trimming groove 11 is located at the first edge 53 of the resistor 5, and the first trimming groove 11 is open to the first edge 53 of the resistor 5.

[0079] In the third embodiment, as compared with the first and second embodiments, as described above, the second end 112 of the first trimming groove 11 is located outside the resistor 5, and therefore, unlike the first and second embodiments, electric field concentration near the second end 112 does not occur in the resistor 5. Therefore, adverse effects due to localized excessive heat generation and microcracks at the second end 112 do not occur.

[0080] Therefore, adverse effects of heat generation on the electrical resistance value of the resistor 5 are suppressed, and the reliability of the chip resistor 1 can be improved.

[0081] 10 shows the results of a simulation using the finite element method on the electric field distribution and heat density distribution when a current is applied to the chip resistor 1 of the third embodiment.

[0082] The simulation was performed under the following assumptions. The difference from the first embodiment is that the X-direction dimension of the first trimming groove 11 is increased by extending the first portion of the first trimming groove 11 toward the first electrode 31. Dimensions of the resistor 5: X-direction dimension 1.35 mm, Y-direction dimension 0.80 mm, Z-direction dimension (thickness) 0.01 mm. Dimensions of the first trimming groove 11: X-direction dimension 0.585 mm, Y-direction dimension 0.40 mm, radius of curvature of the curved portion 115 0.2 mm. Position of the first trimming groove 11: X-direction dimension between the second end 112 and the first edge 53 of the resistor 5 0.165 mm. X-direction dimension between the second end 112 and the edge of the first electrode 31 0.065 mm. Dimensions of the second trimming groove 12: X-direction dimension 0.235 mm, Y-direction dimension 0.20 mm, radius of curvature of the curved portion 125 0.1 mm. Position of second trimming groove 12: X-direction dimension between fourth end 122 and second edge 54 of resistor 5: 0.165 mm. X-direction dimension between fourth end 122 and the edge of second electrode 32: 0.065 mm.

[0083] The results of the simulation of the electric field distribution are shown in FIG. 11, and the results of the simulation of the heat density distribution are shown in FIG.

[0084] Regarding the electric field distribution, the electric field tended to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and the electric field tended to be particularly high on the first trimming groove 11 side. However, local increases in the electric field were less severe than in the first and second embodiments. The electric field was highest near the portion of the curved portion 115 of the first trimming groove 11 closer to the second linear portion 114, but the value was 82.78 kV / m, which was lower than in the first and second embodiments.

[0085] Similarly, with regard to the heat generation distribution, there was a tendency for the heat generation density to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and the heat generation density tended to be particularly high on the first trimming groove 11 side, but the local increase in heat generation density was mitigated compared to the first and second embodiments. The heat generation density was highest near the portion of the curved portion 115 of the first trimming groove 11 closer to the second straight portion 114, and the value was 124.1 GW / m ３ This is a significant reduction compared to the first and second embodiments.

[0086] As described above, although the first trimming groove 11 and the second trimming groove 12 cause the electric field distribution and heat density distribution in the resistor 5 to be uneven, particularly since the portion of the first trimming groove 11 on the second end 112 side reaches the first electrode 31 and further extends outside the first edge 53 of the resistor 5, local excessive increases are suppressed.

[0087] 2.4. Fourth Embodiment The chip resistor 1 according to the fourth embodiment will be described in detail with reference to FIG.

[0088] The chip resistor 1 according to the fourth embodiment has the same configuration as that of the second embodiment, except that the shape of the first trimming groove 11 is different from that of the second embodiment.

[0089] In the fourth embodiment, the first trimming groove 11 has a first linear portion 113 that includes the first end 111 and extends linearly along the direction in which the third edge 51 and the fourth edge 52 are aligned (the Y direction), and a second linear portion 114 that includes the second end 112 and extends linearly along the direction in which the first edge 53 and the second edge 54 are aligned (the X direction). The first trimming groove 11 has an L-shape in which the first linear portion 113 and the second linear portion 114 are directly connected at a vertex 116. That is, the first trimming groove 11 has the vertex 116 that is a portion that is bent at a right angle, and the portion between the first end 111 and the vertex 116 is the linear first linear portion 113, and the portion between the vertex 116 and the second end 112 is the linear second linear portion 114.

[0090] That is, in the fourth embodiment, the first trimming groove 11 and the second trimming groove 12 are both L-shaped having vertices 116, 126. Therefore, when fine-tuning the electrical resistance value of the resistor 5 by forming the first trimming groove 11 and the second trimming groove 12, it is easy to increase the accuracy of the dimensions and shape of the first trimming groove 11 and the accuracy of the dimensions and shape of the second trimming groove 12. Therefore, the electrical resistance value of the resistor 5 can be adjusted with greater accuracy. However, when the first trimming groove 11 has the curved portion 115 and the second trimming groove 12 has the curved portion 125, as in the first embodiment, electric field concentration is suppressed at locations where changes occur in the extension directions of the first trimming groove 11 and the second trimming groove 12, and localized excessive heat generation can be more effectively suppressed.

[0091] 10 shows the results of a simulation using the finite element method on the electric field distribution and heat density distribution when a current is applied to the chip resistor 1 of the fourth embodiment.

[0092] The simulation was performed under the following assumptions. The difference from the second embodiment is that the first trimming groove 11 does not have a curved portion 115 but has a vertex 116. Dimensions of the resistor 5: X-direction dimension 1.35 mm, Y-direction dimension 0.80 mm, Z-direction dimension (thickness) 0.01 mm. Dimensions of the first trimming groove 11: X-direction dimension 0.385 mm, Y-direction dimension 0.40 mm. Position of the first trimming groove 11: X-direction dimension between the second end 112 and the first edge 53 of the resistor 5: 0.165 mm. X-direction dimension between the second end 112 and the edge of the first electrode 31: 0.065 mm. Dimensions of the second trimming groove 12: X-direction dimension 0.235 mm, Y-direction dimension 0.20 mm. Position of the second trimming groove 12: X-direction dimension between the fourth end 122 and the second edge 54 of the resistor 5: 0.165 mm. The dimension in the X direction between the fourth end 122 and the edge of the second electrode 32 is 0.065 mm.

[0093] The results of the simulation of the electric field distribution are shown in FIG. 14, and the results of the simulation of the heat density distribution are shown in FIG.

[0094] Regarding the electric field distribution, the electric field tended to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and the electric field tended to be particularly high on the side of the first trimming groove 11. The electric field value near the second end 112 of the first trimming groove 11 was 114.3 kV / m, which was slightly lower than in the first embodiment, but the highest electric field value was near the apex 116 of the first trimming groove 11, at 187.515 kV / m.

[0095] Similarly, the heat generation distribution showed a tendency for the heat generation density to be higher on the fourth edge 52 side than on the first trimming groove 11 and the second trimming groove 12, and particularly on the first trimming groove 11 side. The heat generation density near the second end 112 of the first trimming groove 11 was 229.1 GW / m ３ , which was slightly lower than that of the first embodiment, the heat generation density was highest near the apex 116 of the first trimming groove 11, and the value was 619.707 GW / m ３ It was.

[0096] Based on the above, it can be determined that an excessive increase in heat generation density can be more effectively suppressed when first trimming groove 11 and second trimming groove 12 each have curved portions 115, 125.

[0097] 2.5. Fifth Embodiment The chip resistor 1 according to the fifth embodiment will be described in detail with reference to FIG.

[0098] In the chip resistor 1 according to the fifth embodiment, a third trimming groove 13 is further formed in the resistor element 5 in the fourth embodiment. The third trimming groove 13 penetrates the resistor element 5 in the Z direction. Otherwise, the fifth embodiment has the same configuration as the fourth embodiment.

[0099] The opposite ends of the third trimming groove 13 are referred to as a fifth end 131 and a sixth end 132, respectively. That is, the third trimming groove 13 has the fifth end 131 and the sixth end 132 and extends in an elongated shape from the fifth end 131 to the sixth end 132. The fifth end 131 is located at the fourth edge 52. That is, the third trimming groove 13 opens outward in the Y direction at the fourth edge 52 of the resistor 5. The sixth end 132 is located between the first edge 53 and the second edge 54 of the resistor 5 and between the third edge 51 and the fourth edge 52, and is closer to the third edge 51 and the second electrode 32 than the fifth end 131 is. The third trimming groove 13 has a shape that extends from the fifth end 131 toward the third edge 51 and further toward the sixth end 132.

[0100] Specifically, the third trimming groove 13 has a first linear portion 133 that includes the fifth end 131 and extends linearly along the direction in which the third edge 51 and the fourth edge 52 are aligned (the Y direction), and a second linear portion 134 that includes the sixth end 132 and extends linearly along the direction in which the first edge 53 and the second edge 54 are aligned (the X direction). The third trimming groove 13 has an L-shape in which the first linear portion 133 and the second linear portion 134 are directly connected at a vertex 136. That is, the third trimming groove 13 has the vertex 136 that is a portion that is bent at a right angle, and the portion between the fifth end 131 and the vertex 136 is the linear first linear portion 133, and the portion between the vertex 136 and the sixth end 132 is the linear second linear portion 134.

[0101] The length of third trimming groove 13 is preferably equal to or less than the length of second trimming groove 12. In the fifth embodiment, the length of third trimming groove 13 is shorter than the length of second trimming groove 12. The dimension of third trimming groove 13 in the X direction is shorter than the dimension of second trimming groove 12 in the X direction, and the dimension of third trimming groove 13 in the Y direction is shorter than the dimension of second trimming groove 12 in the Y direction.

[0102] The third trimming groove 13 allows for further fine adjustment of the electrical resistance value of the resistor 5. That is, the electrical resistance value of the resistor 5 is adjusted to a certain extent by first forming the first trimming groove 11 in the resistor 5, and then the electrical resistance value of the resistor 5 is finely adjusted by forming the second trimming groove 12. Then, the electrical resistance value of the resistor 5 is further finely adjusted by further forming the third trimming groove 13. This makes it easier to finely adjust the electrical resistance value of the resistor 5 more accurately.

[0103] Furthermore, by having the above-described configuration of third trimming groove 13, local excessive heat generation is also suppressed around third trimming groove 13.

[0104] 3. Modifications Modifications of the present disclosure will now be described.

[0105] The shapes of first trimming groove 11, second trimming groove 12, and third trimming groove 13 are not limited to those in the above embodiment. For example, first trimming groove 11 does not have to have a linear portion. In that case, first trimming groove 11 may have, for example, an arc-shaped shape overall. The same applies to second trimming groove 12 and third trimming groove 13.

[0106] Furthermore, as with the first trimming groove 11 in the third embodiment, in the first to fifth embodiments, the portion of the second trimming groove 12 on the fourth end 122 side may extend beyond the second edge 54 of the resistor 5 toward the second electrode 32. That is, the portion of the second trimming groove 12 on the fourth end 122 side may reach the second electrode 32 and extend beyond the second edge 54 of the resistor 5. In this case, the fourth end 122 of the second trimming groove 12 is located outside the resistor 5. In this case, electric field concentration near the fourth end 122 of the resistor 5 is prevented. Therefore, adverse effects due to local excessive heat generation and microcracks at the fourth end 122 are also prevented.

[0107] In any of the first, second, and third embodiments, the resistor 5 may be formed with a third trimming groove 13 as in the fifth embodiment.

[0108] Also, third trimming groove 13 may have a shape that does not have vertex 136 but has a curved portion.

[0109] The resistor 5 may further have trimming grooves different from the first trimming groove 11 , the second trimming groove 12 , and the third trimming groove 13 formed therein.

[0110] The chip resistor 1 may be a thin film chip resistor.

[0111] 4. Aspects As is apparent from the above-described embodiments and modifications, the present disclosure includes the following aspects.

[0112] A chip resistor (1) of a first aspect includes a substrate (2) having a support surface (21), a first electrode (31) and a second electrode (32) respectively disposed at both ends of the substrate (2) in one direction along the support surface (21), and a resistor (5) disposed on the support surface (21) of the substrate (2) spanning from the first electrode (31) to the second electrode (32). The resistor (5) has a first edge (53) which is the edge on the first electrode (31) side, a second edge (54) which is the edge on the second electrode (32) side, a third edge (51), and a fourth edge (52) which is the edge opposite the third edge (51). The third edge (51) and the fourth edge (52) are aligned in a direction along the support surface (21) and intersect with the direction in which the first edge (53) and the second edge (54) are aligned. The resistor (5) is formed with a first trimming groove (11) and a second trimming groove (12). The first trimming groove (11) has a first end (111) and a second end (112), with the first end (111) located at the third edge (51) and the second end (112) located closer to the fourth edge (52) and the first electrode (31) than the first end (111). The first trimming groove (11) has a shape that extends from the first end (111) toward the fourth edge (52) and further toward the second end (112). The second trimming groove (12) has a third end (121) and a fourth end (122), the third end (121) being located closer to the second edge (54) than the first end (111) of the third edge (51), and the fourth end (122) being located closer to the fourth edge (52) and the second electrode (32) than the third end (121). The second trimming groove (12) has a shape that extends from the third end (121) toward the fourth edge (52) and further toward the fourth end (122).

[0113] According to this aspect, localized excessive heat generation around the first trimming groove (11) and the second trimming groove (12) is suppressed, and the effect of such localized excessive heat generation on the electrical resistance value of the resistor (5) is suppressed, thereby improving the reliability of the chip resistor (1).

[0114] In the second aspect, in the first aspect, the second end (112) of the first trimming groove (11) is located closer to the second edge (54) than the first edge (53), and there is a gap between the second end (112) and the first electrode (31) in the direction in which the first electrode (31) and the second electrode (32) are aligned.

[0115] According to this embodiment, localized excessive heat generation around the second end (112) is suppressed, and even if microcracks occur around the second end (112), the effect of the microcracks on the electrical resistance value can be suppressed.

[0116] In the third aspect, in the first aspect, the portion of the first trimming groove (11) on the second end (112) side extends beyond the first edge (53) to the first electrode (31) side.

[0117] According to this embodiment, since the second end (112) of the first trimming groove (11) is outside the resistor (5), the influence of heat generation around the second end (112) on the electrical resistance value can be suppressed.

[0118] In a fourth aspect, in any one of the first to third aspects, the fourth end (122) of the second trimming groove (12) is located closer to the first edge (53) than the second edge (54), and there is a gap between the fourth end (122) and the second electrode (32) in the direction in which the first electrode (31) and the second electrode (32) are aligned.

[0119] According to this embodiment, localized excessive heat generation around the fourth end (122) is suppressed, and even if microcracks occur around the fourth end (122), the effect of the microcracks on the electrical resistance value can be suppressed.

[0120] In a fifth aspect, in any one of the first to third aspects, the portion of the second trimming groove (12) on the fourth end (122) side extends further toward the second electrode (32) than the second edge (54).

[0121] According to this embodiment, since the fourth end (122) of the second trimming groove (12) is located outside the resistor (5), the influence of heat generation around the fourth end (122) on the electrical resistance value can be suppressed.

[0122] In a sixth aspect, in any one of the first to fifth aspects, the first trimming groove (11) has a first straight portion (113) including a first end (111) and extending linearly along the direction in which the third edge (51) and the fourth edge (52) are aligned, a second straight portion (114) including a second end (112) and extending linearly along the direction in which the first edge (53) and the second edge (54) are aligned, and an arc-shaped curved portion (115) connecting the first straight portion (113) and the second straight portion (114).

[0123] According to this embodiment, local excessive heat generation around the portion where the direction of the first trimming groove (11) changes can be suppressed, and the influence of such heat generation on the electrical resistance value can be suppressed.

[0124] In a seventh aspect, in any one of the first to fifth aspects, the first trimming groove (11) has a first linear portion (113) including a first end (111) and extending linearly along the direction in which the third edge (51) and the fourth edge (52) are aligned, and a second linear portion (114) including a second end (112) and extending linearly along the direction in which the first edge (53) and the second edge (54) are aligned. The first trimming groove (11) has an L-shaped configuration in which the first linear portion (113) and the second linear portion (114) are directly connected.

[0125] According to this embodiment, it becomes easy to improve the accuracy of the dimensions and shape of the first trimming groove (11), and therefore it becomes easy to adjust the electrical resistance value of the resistor (5) by the first trimming groove (11).

[0126] In an eighth aspect, in any one of the first to seventh aspects, the second trimming groove (12) has a first straight portion (123) that includes a third end (121) and extends linearly along the direction in which the third edge (51) and the fourth edge (52) are aligned, a second straight portion (124) that includes a fourth end (122) and extends linearly along the direction in which the first edge (53) and the second edge (54) are aligned, and an arc-shaped curved portion (125) that connects the first straight portion (123) and the second straight portion (124).

[0127] According to this aspect, local excessive heat generation around the portion where the direction of the second trimming groove (12) changes can be suppressed, and the influence of such heat generation on the electrical resistance value can be suppressed.

[0128] In a ninth aspect, in any one of the first to seventh aspects, the second trimming groove (12) has a first linear portion (123) that includes a third end (121) and extends linearly along the direction in which the third edge (51) and the fourth edge (52) are aligned, and a second linear portion (124) that includes a fourth end (122) and extends linearly along the direction in which the first edge (53) and the second edge (54) are aligned. The second trimming groove (12) has an L-shaped configuration in which the first linear portion (123) and the second linear portion (124) are directly connected.

[0129] According to this embodiment, it becomes easy to improve the accuracy of the dimensions and shape of the second trimming groove (12), and therefore it becomes easy to adjust the electrical resistance value of the resistor (5) by the second trimming groove (12).

[0130] In a tenth aspect, in any one of the first to ninth aspects, the length of the second trimming groove (12) is equal to or less than the length of the first trimming groove (11).

[0131] According to this embodiment, when adjusting the electrical resistance value of the resistor 5 using the first trimming groove (11) and the second trimming groove (12), the electrical resistance value of the resistor (5) can be adjusted with high precision by not only the adjustment using the first trimming groove (11) but also the fine adjustment using the second trimming groove (12).

[0132] In an eleventh aspect, in any one of the first to tenth aspects, a third trimming groove (13) is further formed in the resistor (5). The third trimming groove (13) has a fifth end (131) and a sixth end (132). The fifth end (131) is located at the fourth edge (52), and the sixth end (132) is located closer to the third edge (51) and to the second electrode (32) than the fifth end (131). The third trimming groove (13) has a shape that extends from the fifth end (131) toward the third edge (51) and further toward the sixth end (132).

[0133] According to this embodiment, the electrical resistance of the resistor 5 can be adjusted with high precision by adjusting the electrical resistance of the resistor 5 using the third trimming groove 13. In addition, excessive localized heat generation around the third trimming groove 13 can be suppressed, thereby suppressing the effect of such heat generation on the electrical resistance.

[0134] 1 Chip resistor 11 First trimming groove 111 First end 112 Second end 113 First straight portion 114 Second straight portion 115 Curved portion 12 Second trimming groove 121 Third end 122 Fourth end 123 First straight portion 124 Second straight portion 125 Curved portion 13 Third trimming groove 131 Fifth end 132 Sixth end 2 Substrate 21 Support surface 31 First electrode 32 Second electrode 5 Resistor 53 First edge 54 Second edge 51 Third edge 52 Fourth edge 51 Third edge 52 Fourth edge

Claims

1. A device comprising: a substrate having a support surface; a first electrode and a second electrode respectively disposed at both ends of the substrate in one direction along the support surface; and a resistor disposed on the support surface of the substrate spanning from the first electrode to the second electrode, wherein the resistor has a first edge which is the edge on the first electrode side, a second edge which is the edge on the second electrode side, a third edge, and a fourth edge which is the edge opposite to the third edge, the third edge and the fourth edge being aligned in a direction along the support surface and intersecting the alignment direction of the first edge and the second edge; a first trimming groove and a second trimming groove formed in the resistor; the first trimming groove having a first end and a second end, the first end being located at the third edge and the second end being located closer to the fourth edge and the first electrode than the first end; and the first trimming groove having a shape which extends from the first end to the fourth edge and further towards the second end. a second trimming groove having a third end and a fourth end, the third end being located closer to the second end than the first end on the third edge, and the fourth end being located closer to the fourth end and the second electrode than the third end, and the second trimming groove having a shape that extends from the third end toward the fourth edge and further toward the fourth end.

2. A chip resistor as described in claim 1, wherein the second end of the first trimming groove is located closer to the second edge than the first edge, and a gap is provided between the second end and the first electrode in the direction in which the first electrode and the second electrode are aligned.

3. The chip resistor according to claim 1, wherein the portion of the first trimming groove on the second end side extends beyond the first edge toward the first electrode.

4. A chip resistor as described in claim 1 or 2, wherein the fourth end of the second trimming groove is located closer to the first edge than the second edge, and a gap is provided between the fourth end and the second electrode in the direction in which the first electrode and the second electrode are aligned.

5. The chip resistor according to claim 1, wherein the portion of the second trimming groove on the fourth end side extends beyond the second edge toward the second electrode.

6. A chip resistor as described in claim 1, wherein the first trimming groove has: a first linear portion that includes the first end and extends linearly along the direction in which the third edge and the fourth edge are aligned; a second linear portion that includes the second end and extends linearly along the direction in which the first edge and the second edge are aligned; and an arc-shaped curved portion that connects the first linear portion and the second linear portion.

7. The chip resistor according to claim 1, wherein the first trimming groove has: a first linear portion that includes the first end and extends linearly along the direction in which the third edge and the fourth edge are aligned; and a second linear portion that includes the second end and extends linearly along the direction in which the first edge and the second edge are aligned; and the first trimming groove has an L-shape in which the first linear portion and the second linear portion are directly connected.

8. The chip resistor described in claim 1, wherein the second trimming groove has: a first linear portion that includes the third end and extends linearly along the direction in which the third edge and the fourth edge are aligned; a second linear portion that includes the fourth end and extends linearly along the direction in which the first edge and the second edge are aligned; and an arc-shaped curved portion that connects the first linear portion and the second linear portion.

9. The chip resistor according to claim 1, wherein the second trimming groove has: a first linear portion that includes the third end and extends linearly along the direction in which the third edge and the fourth edge are aligned; and a second linear portion that includes the fourth end and extends linearly along the direction in which the first edge and the second edge are aligned; and the second trimming groove has an L-shape in which the first linear portion and the second linear portion are directly connected.

10. The chip resistor according to claim 1, wherein the length of the second trimming groove is equal to or less than the length of the first trimming groove.

11. The chip resistor according to claim 1, wherein a third trimming groove is further formed in the resistor, the third trimming groove having a fifth end and a sixth end, the fifth end being located at the fourth edge, the sixth end being located at a position closer to the third edge and the second electrode than the position of the fifth end, and the third trimming groove having a shape that extends from the fifth end towards the third edge and further towards the sixth end.

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