Chip resistor

Abstract

To provide a chip resistor having excellent surge characteristics and suitable for miniaturization.SOLUTION: A chip resistor 1 according to the present invention has a crank-shaped resistor 7 having a first resistor portion 7a, a second resistor portion 7b, and a third resistor portion 7c, and a first trimming groove 12 and a second trimming groove 13 are formed with their starting ends at positions that are approximately point-symmetric on the upper and lower sides of the first resistor portion 7a, and the ending positions of the first trimming groove 12 and the second trimming groove 13 are set so as not to exceed a first straight line A that passes through the center (point O) of the first resistor portion 7a and extends in the X-axis direction, and so as not to overlap on the same Y-axis.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a chip resistor in which the resistance value is adjusted by forming a trimming groove in the resistor element. [Background technology]

[0002] A chip resistor is mainly composed of a rectangular insulating substrate, a pair of front electrodes arranged opposite each other with a specified distance on the surface of the insulating substrate, a pair of back electrodes arranged opposite each other with a specified distance on the back surface of the insulating substrate, end electrodes bridging the front electrodes and the back electrodes, a resistive element bridging the pair of front electrodes, and a protective film covering the resistive element.

[0003] Generally, when manufacturing this type of chip resistor, a large number of electrodes, resistors, protective films, etc. are formed on a large sheet-like substrate at once, and then the large substrate is divided along grid-like dividing lines (e.g., dividing grooves) to obtain a large number of chip resistors. In the manufacturing process of such chip resistors, a large number of resistors are formed on one side of the large substrate by printing and firing a resistive paste, but since it is difficult to avoid slight variations in the size and film thickness of each resistor due to misalignment or bleeding during printing or uneven temperature in the firing furnace, a resistance value adjustment work is performed in which trimming grooves are formed in each resistor while the substrate is still in the large substrate and the desired resistance value is set.

[0004] When a surge voltage generated by static electricity or power supply noise is applied to a chip resistor having such a configuration, the excessive electrical stress affects the characteristics of the resistor, and in the worst case, the resistor may be destroyed. It is known that the surge characteristics can be improved by making the resistor meandering (meandering) and increasing its overall length, which makes the potential drop more gradual.

[0005] For example, as described in Patent Document 1, a chip resistor is proposed in which a serpentine-shaped resistor is formed on the main surface of an insulating substrate by a printing technique, and then trimming grooves are formed in opposite directions extending linearly from each of the opposing sides of the resistor, and these two trimming grooves are extended to a position where their tips intersect, causing the resistor to meander near the tips of the two trimming grooves, thereby increasing its overall length.

[0006] In a chip resistor configured in this manner, two trimming grooves that extend linearly relative to the resistor element are formed in opposite directions at 180 degrees, so that the main current path of the resistor element changes by 180 degrees at the point where the tips of the two trimming grooves intersect. This increases the overall length of the printed resistor element and improves surge characteristics. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2006-19694 A Summary of the Invention [Problem to be solved by the invention]

[0008] However, in the conventional technology described in Patent Document 1, in which the tips of two trimming grooves are arranged to intersect with each other and the current path is turned 180 degrees, microcracks that occur at the tips of the two trimming grooves occur in the turn where the load is concentrated, so that when a high voltage is applied, there is a risk that the resistor will be destroyed due to a local temperature rise. In particular, in small-sized chip resistors with a small board area, the width dimension of the resistor becomes very narrow as the overall length of the resistor is increased by the trimming grooves, so when the chip resistor is used with a large power load, the current per unit area (current density) becomes large, and a problem occurs in that the resistor cannot withstand the load and is prone to destruction.

[0009] The present invention has been made in view of the above-mentioned state of the art, and an object of the present invention is to provide a chip resistor which has excellent surge characteristics and is suitable for miniaturization. [Means for solving the problem]

[0010] In order to achieve the above object, a chip resistor according to one embodiment of the present invention comprises a rectangular parallelepiped insulating substrate, first and second electrodes arranged opposite each other at both ends of the insulating substrate with a constant interval therebetween, and a resistor arranged in the interval to bridge between the first electrode and the second electrode, and a first trimming groove and a second trimming groove for adjusting a resistance value are formed in the resistor, the resistor comprising a rectangular first resistor portion extending parallel to the first electrode and the second electrode, a rectangular second resistor portion extending from the first electrode toward the second electrode halfway through the interval and connected to one side of the first resistor portion, and a first trimming groove and a second trimming groove formed in the second electrode. and a third resistor portion extending from the first resistor portion toward the first electrode to partway through the gap and connecting to the other side of the first resistor portion, when the center of the first resistor portion is defined as point O, the first trimming groove and the second trimming groove are formed with their starting ends positioned at opposing outer edge portions of the first resistor portion which are located at positions which are approximately point-symmetrical with respect to point O, and the end positions of the first trimming groove and the second trimming groove do not exceed a straight line which passes through point O and extends parallel to the extension direction of the first electrode and the second electrode, and are set so as not to overlap on a straight line which is perpendicular to the extension direction of the first electrode and the second electrode.

[0011] In a chip resistor configured in this manner, the resistor having the first resistive body portion, the second resistive body portion, and the third resistive body portion is formed in a crank shape, thereby ensuring the overall length of the resistor and providing stable surge characteristics. Furthermore, even if a first trimming groove and a second trimming groove are formed in a resistor shaped like this to adjust the resistance value, the main current path after the resistance value adjustment becomes long without having a turn portion, so that it is possible to further improve the surge characteristics while reducing the adverse effects on characteristics caused by microcracks, and a small, high-power compatible chip resistor can be realized.

[0012] In a chip resistor having the above configuration, the shapes of the first trimming groove and the second trimming groove are not limited, but if these first trimming groove and second trimming groove have an L-cut shape having a coarse adjustment section extending in a straight line from the starting position toward the inside of the first resistor portion and a fine adjustment section bending from the tip of the coarse adjustment section, the tips of the first trimming groove and the second trimming groove will be located away from the main current path, which makes it difficult for loads to concentrate on the tips of the first trimming groove and the second trimming groove, which is preferable.

[0013] In this case, if the fine-adjustment portion of the first trimming groove and the fine-adjustment portion of the second trimming groove extend to a position beyond the line that passes through the center (point O) of the first resistor portion and is perpendicular to the extension direction of the first electrode and the second electrode, microcracks that occur at the tips of the first trimming groove and the second trimming groove will be moved away from the center of the first resistor portion, and the location where the microcracks occur can be moved away from the main current path where the load is concentrated.

[0014] Furthermore, in a chip resistor having the above configuration, if the fine-tuning portion of the first trimming groove and the fine-tuning portion of the second trimming groove extend in directions away from each other, microcracks that occur at the tips of the first trimming groove and the second trimming groove will be moved away from the center of the first resistor portion, and the location where the microcracks occur can be moved away from the main current path where the load is concentrated.

[0015] A chip resistor according to another aspect of the present invention includes a rectangular parallelepiped insulating substrate, first and second electrodes arranged to face each other at both ends of the insulating substrate with a constant interval between them, and a resistor arranged in the interval to bridge between the first and second electrodes, the resistor having a first trimming groove and a second trimming groove for adjusting a resistance value formed therein, the resistor including a rectangular first resistor portion extending parallel to the first and second electrodes, a rectangular second resistor portion extending from the first electrode toward the second electrode to partway through the interval and connected to one side of the first resistor portion, and a third resistor portion extending from the second electrode toward the first electrode to partway through the interval and connected to the other side of the first resistor portion. When the center of the first resistor portion is defined as point O, the first trimming groove and the second trimming groove are formed in an I-cut shape with their starting ends positioned at outer edge portions of the second resistor portion and the third resistor portion which are located at positions that are approximately point-symmetrical with respect to point O, and at least one of the first trimming groove and the second trimming groove extends to a position beyond a straight line that passes through point O and is perpendicular to the extension direction of the first electrode and the second electrode, and the end positions of the first trimming groove and the second trimming groove do not pass beyond a straight line that passes through point O and extends parallel to the extension direction of the first electrode and the second electrode, and are set so as not to overlap on the straight line that is perpendicular to the extension direction of the first electrode and the second electrode.

[0016] In a chip resistor configured in this manner, the resistor having the first resistive body portion, the second resistive body portion, and the third resistive body portion is formed in a crank shape, thereby ensuring the overall length of the resistor and providing stable surge characteristics. In addition, even if the resistance value is adjusted by forming first and second trimming grooves in an I-cut shape with the outer edges of the second resistive body portion and the third resistive body portion of the resistor as the starting position, the main current path after the resistance value adjustment becomes long without having a turn portion, so that the surge characteristics can be further improved while reducing the adverse effects on characteristics caused by microcracks, and a small, high-power compatible chip resistor can be realized. Effect of the Invention

[0017] According to the present invention, it is possible to provide a chip resistor that has excellent surge characteristics and is suitable for miniaturization. [Brief description of the drawings]

[0018] [Figure 1] 1 is a plan view of a chip resistor according to a first embodiment of the present invention; [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] 2 is an explanatory diagram of a resistor provided in the chip resistor of FIG. 1. [Figure 4] FIG. 11 is an explanatory diagram of a resistor according to Modification 1. [Diagram 5] FIG. 11 is an explanatory diagram of a resistor according to Modification 2. [Figure 6] FIG. 11 is an explanatory diagram of a resistor according to Modification 3. [Figure 7] FIG. 5 is a plan view of a chip resistor according to a second embodiment of the present invention. [Figure 8] 8 is an explanatory diagram of a resistor provided in the chip resistor of FIG. 7. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0019] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0020] FIG. 1 is a plan view of a chip resistor according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.

[0021] 1 and 2, the chip resistor 1 according to the first embodiment is mainly composed of a rectangular insulating substrate 2, a first front electrode 3 and a second front electrode 4 provided at both ends in the short side direction on the front surface of the insulating substrate 2, a first back electrode 5 and a second back electrode 6 provided at both ends in the short side direction on the back surface of the insulating substrate 2, a resistor 7 provided to conduct between the pair of the first front electrode 3 and the second front electrode 4, an undercoat layer 8 provided to cover the resistor 7, an overcoat layer 9 provided to cover the undercoat layer 8, a pair of end electrodes 10 provided on both ends in the short side direction of the insulating substrate 2, and a pair of external electrodes 11 provided to cover the end electrodes 10. In the following description, the longitudinal direction of the insulating substrate 2 (the left-right direction in FIG. 1) is the X-axis, and the short side direction of the insulating substrate 2 (the up-down direction in FIG. 1) is the Y-axis.

[0022] The insulating substrate 2 is obtained by dividing a large sheet-like substrate along primary dividing grooves and secondary dividing grooves that extend vertically and horizontally into multiple pieces, and the large substrate is a ceramic substrate whose main component is alumina.

[0023] The first surface electrode 3 and the second surface electrode 4 are formed by screen printing an Ag-based paste containing Ag (silver) as the main component, followed by drying and firing. The first surface electrode 3 and the second surface electrode 4 are formed at a constant interval in the short direction (Y-axis direction) along the long side of the surface of the insulating substrate 2.

[0024] The first back electrode 5 and the second back electrode 6 are formed by screen printing an Ag-based paste, followed by drying and firing. The first back electrode 5 and the second back electrode 6 are formed at a constant interval in the short direction along the long side of the rear surface of the insulating substrate 2.

[0025] Resistor 7 is formed by screen printing a resistor paste such as ruthenium oxide, followed by drying and baking. As will be described in detail later, resistor 7 has two trimming grooves (first trimming groove 12 and second trimming groove 13), and the resistance value of resistor 7 formed by printing is adjusted to a target value by means of these first and second trimming grooves 12, 13.

[0026] The undercoat layer 8 is formed by screen printing a glass paste, followed by drying and baking. The undercoat layer 8 is formed so as to cover the entire resistor 7 before the first and second trimming grooves 12, 13 are formed.

[0027] The overcoat layer 9 is formed by screen printing a resin paste such as an epoxy resin or a phenol resin and then heat-curing it. The overcoat layer 9 is formed so as to cover the entire undercoat layer 8 after the first and second trimming grooves 12, 13 are formed.

[0028] The pair of end electrodes 10 are formed by sputtering Ni-Cr or the like, and provide electrical conductivity between the first front electrode 3 and the first back electrode 5, and between the second front electrode 4 and the second back electrode 6, which are separated by the end faces of the insulating substrate 2.

[0029] A pair of external electrodes 11 each have a two-layer structure consisting of an inner barrier layer 14 and an outer external connection layer 15, of which the barrier layer 14 is a Ni plating layer formed by electrolytic plating, and the external connection layer 15 is a Sn plating layer formed by electrolytic plating.

[0030] Figure 3 is an explanatory diagram of the resistor 7 provided in the chip resistor 1, where Figure 3(A) shows the state before the first and second trimming grooves 12, 13 are formed, and Figure 3(B) shows the state after the first and second trimming grooves 12, 13 have been formed.

[0031] 3(A), the first front electrode 3 and the second front electrode 4 are disposed opposite each other at both ends in the short side direction on the surface of the insulating substrate 2 with a constant width of interval D between them, and a resistor 7 is printed within the interval D to provide electrical continuity between the first front electrode 3 and the second front electrode 4. The resistor 7 has a rectangular first resistor portion 7a disposed in the center of the interval D and extending parallel to the first front electrode 3 and the second front electrode 4 (in the X-axis direction), a rectangular second resistor portion 7b that has the first front electrode 3 as its connection end, extends in the Y-axis direction to the middle of the interval D and connects to the left side of the first resistor portion 7a in the figure, and a third resistor portion 7c that has the second front electrode 4 as its connection end, extends in the Y-axis direction to the middle of the interval D and connects to the right side of the first resistor portion 7a in the figure.

[0032] Here, assuming that the width dimension of the first resistor portion 7a along the Y-axis direction is W1, the width dimension of the second resistor portion 7b along the X-axis direction is W2, and the width dimension of the third resistor portion 7c along the X-axis direction is W3, the width dimension W1 of the first resistor portion 7a is larger than the width dimensions W2, W3 of the second resistor portion 7b and the third resistor portion 7c (W1>W2, W3), and the width dimensions W2, W3 of the second resistor portion 7b and the third resistor portion 7c are set equal (W2=W3). That is, the printed resistor 7 has a crank shape that is point-symmetrical with respect to the center (point O) of the first resistor portion 7a, and the crank shape makes the entire length of the resistor 7 long, so that the entire length of the resistor is secured and stable surge characteristics are obtained. As indicated by the arrow E1 in FIG. 3(A), in the resistor 7 having such a shape, the main current path E1, through which the largest current flows from the first front electrode 3 to the second front electrode 4, is a straight path that runs from the lower left corner of the first resistor portion 7a, through point O, to the upper right corner.

[0033] As shown in FIG. 3B, by forming first trimming groove 12 and second trimming groove 13 in such resistor 7, the initial resistance value of resistor 7 after printing is adjusted to a target value.

[0034] The first trimming groove 12 is formed in an L-cut shape overall, and is made up of a coarse adjustment portion 12a that starts at the bottom side of the first resistor portion 7a and extends linearly upward along the Y-axis, and a fine adjustment portion 12b that bends at a right angle from the tip of coarse adjustment portion 12a and extends to the right along the X-axis. The second trimming groove 13 is formed in an L-cut shape overall, and is made up of a coarse adjustment portion 13a that starts at the top side of the first resistor portion 7a and extends linearly downward along the Y-axis, and a fine adjustment portion 13b that bends at a right angle from the tip of coarse adjustment portion 13a and extends to the left along the X-axis.

[0035] In this way, the first trimming groove 12 and the second trimming groove 13 are formed with the starting end positions being approximately point-symmetrical positions on the upper and lower sides of the first resistor portion 7a. The coarse adjustment portions 12a, 13a of the first trimming groove 12 and the second trimming groove 13 are formed so as to narrow the width dimension W1 of the first resistor portion 7a, so that the resistance value can be coarsely adjusted by extending the cutting amount of the coarse adjustment portions 12a, 13a in the Y-axis direction. On the other hand, the fine adjustment portions 12b, 13b of the first trimming groove 12 and the second trimming groove 13 are formed in an area of ​​the first resistor portion 7a with a small current distribution, so that the ratio of the resistance value increment to the cutting amount increment of the fine adjustment portions 12b, 13b is small, so that the resistance value can be finely adjusted with high accuracy by extending the cutting amount of the fine adjustment portions 12b, 13b in the X-axis direction.

[0036] 3(B), if a line (hereinafter referred to as a first line) passing through the center (point O) of first resistor portion 7a and extending in the X-axis direction is labeled with A, and a line (hereinafter referred to as a second line) passing through the center (point O) of first resistor portion 7a and extending in the Y-axis direction is labeled with B, coarse adjustment portions 12a, 13a of first trimming groove 12 and second trimming groove 13 are both set so as not to exceed first line A. Fine adjustment portions 12b, 13b of first trimming groove 12 and second trimming groove 13 are both set so as not to exceed second line B so that their tips do not overlap on the same Y-axis.

[0037] As shown by arrow E2 in Fig. 3B, in resistor 7 after the resistance value is adjusted by first trimming groove 12 and second trimming groove 13, main current path E2, through which the largest current flows from first front electrode 3 to second front electrode 4, is a curved path that runs from the lower left corner of first resistor portion 7a to the upper right corner, passing through the corners of first trimming groove 12 and second trimming groove 13. This main current path E2 is longer than the linear main current path E1 that flows in resistor 7 before the resistance value is adjusted, so that the formation of first trimming groove 12 and second trimming groove 13 further improves surge characteristics. However, the main current path E2 is not lengthened by crossing the tips of first trimming groove 12 and second trimming groove 13, but is a curved path without a turn portion, so that damage to resistor 7 caused by microcracks at the tips of first trimming groove 12 and second trimming groove 13 can be prevented.

[0038] As described above, in the chip resistor 1 of the first embodiment, the resistor 7 is printed and formed within the space D between the first surface electrode 3 and the second surface electrode 4. The resistor 7 has a rectangular first resistor portion 7a that is positioned in the center of the space D and extends in the X-axis direction, a rectangular second resistor portion 7b that has the first surface electrode 3 as its connection end, extends in the Y-axis direction to halfway through the space D and connects to one side of the first resistor portion 7a, and a third resistor portion 7c that has the second surface electrode 4 as its connection end, extends in the Y-axis direction to halfway through the space D and connects to the other side of the first resistor portion 7a. Since the resistor 7 is printed and formed in an overall crank shape, the entire length of the resistor 7 can be secured to provide stable surge characteristics.

[0039] For this resistor 7, the first trimming groove 12 and the second trimming groove 13 are formed with their starting positions being approximately point-symmetric positions on the upper and lower sides of the first resistor portion 7a, and the ending positions of the first trimming groove 12 and the second trimming groove 13 are set so as not to exceed the first straight line A extending in the X-axis direction through the center (point O) of the first resistor portion 7a and so as not to overlap on the same Y-axis. As a result, the main current path E2 after resistance value adjustment does not have a turn portion, and therefore the surge characteristics ensured by the crank-shaped resistor 7 are further improved and the adverse effects on characteristics caused by microcracks can be reduced, thereby realizing a small-sized, high-power compatible chip resistor 100.

[0040] Furthermore, since the first trimming groove 12 and the second trimming groove 13 have an L-cut shape consisting of coarse adjustment portions 12a, 13a extending in a straight line from the starting position toward the inside of the first resistor portion 7a and fine adjustment portions 12b, 13b bent at a right angle from the tips of the coarse adjustment portions 12a, 13a, the tips of the fine adjustment portions 12b, 13b are positioned away from the main current path E2, and concentration of the load on the tips of the first trimming groove 12 and the second trimming groove 13 can be suppressed.

[0041] Next, first to third modifications of the first trimming groove 12 and the second trimming groove 13 formed in the resistor 7 will be described with reference to FIGS.

[0042] FIG. 4 is an explanatory diagram of a resistor according to a first modification, FIG. 5 is an explanatory diagram of a resistor according to a second modification, and FIG. 6 is an explanatory diagram of a resistor according to a third modification.

[0043] As shown in FIG. 4, resistor 7 of variant 1 is characterized in that fine adjustment portion 12b of first trimming groove 12 extends beyond second straight line B to the right on the X-axis, and fine adjustment portion 13b of second trimming groove 13 extends beyond second straight line B to the left on the X-axis.

[0044] In the resistor 7 of variant example 1, microcracks that occur at the tips of the fine-tuning portions 12b, 13b of the first trimming groove 12 and the second trimming groove 13 are located far away from the center (point O) of the first resistor portion 7a, thereby improving surge characteristics while keeping the location where the microcracks occur away from the main current path where the load is concentrated.

[0045] As shown in FIG. 5, resistor 7 of variant example 2 is characterized in that fine adjustment portion 12b of first trimming groove 12 is bent at a right angle from the tip of coarse adjustment portion 12a to the left along the X-axis, and fine adjustment portion 13b of second trimming groove 13 is bent at a right angle from the tip of coarse adjustment portion 13a to the right along the X-axis, such that fine adjustment portion 12b of first trimming groove 12 and fine adjustment portion 13b of second trimming groove 13 extend in directions away from each other.

[0046] In the resistor 7 of variant example 2, the fine adjustment portions 12b, 13b of the first trimming groove 12 and the second trimming groove 13 extend in a direction away from the center of the first resistor portion 7a, thereby improving surge characteristics and separating the site where microcracks occur from the main current path where the load is concentrated.

[0047] As shown in FIG. 6, resistor 7 according to variant example 3 is characterized in that coarse adjustment portions 12a, 13a of first trimming groove 12 and second trimming groove 13 extend obliquely from their starting positions with respect to the Y-axis, and fine adjustment portions 12b, 13b are bent at right angles from the tips of coarse adjustment portions 12a, 13a, thereby forming first trimming groove 12 and second trimming groove 13 in an L-cut shape.

[0048] In the resistor 7 of variant example 3, the coarse adjustment portions 12a, 13a of the first trimming groove 12 and the second trimming groove 13 are both set so as not to exceed the first straight line A, and the coarse adjustment portions 12a, 13a extend in a direction away from the center of the first resistor portion 7a. This improves surge characteristics while keeping the site where microcracks occur away from the main current path where the load is concentrated.

[0049] FIG. 7 is a plan view of a chip resistor 20 according to a second embodiment of the present invention, and FIG. 8 is an explanatory diagram of a resistor 7 provided in the chip resistor 20 of FIG. 7. Parts corresponding to those in FIGS. 1 to 3 are given the same symbols to appropriately omit redundant explanations.

[0050] In the chip resistor 20 of the second embodiment, a first trimming groove 21 and a second trimming groove 22 are formed in the printed crank-shaped resistor 7, so that the initial resistance value of the resistor 7 after printing is adjusted to a target value.

[0051] The first trimming groove 21 and the second trimming groove 22 are formed in an I-cut shape with their starting ends at the sides of the second resistor portion 7b and the third resistor portion 7c that are located at positions that are approximately point symmetrical with respect to the center (point O) of the first resistor portion 7a. Specifically, the first trimming groove 21 starts at the right side of the second resistor portion 7b and extends leftward along the X-axis to a position that exceeds the second straight line B, and the second trimming groove 22 starts at the right side of the third resistor portion 7c and extends leftward along the X-axis to a position that exceeds the second straight line B.

[0052] In resistor 7 after the resistance value is adjusted, the main current path along which the greatest current flows from first front electrode 3 to second front electrode 4 is a curved path that runs from the lower left corner of first resistor portion 7a to the upper right corner, passing through the tips of first trimming groove 21 and second trimming groove 22, and therefore the surge characteristics are further improved by forming first trimming groove 21 and second trimming groove 22. Note that it is not necessary for either first trimming groove 21 or second trimming groove 22 to exceed second straight line B, as long as their tips do not overlap on the same Y axis.

[0053] In the chip resistor 20 of the second embodiment configured in this manner, the resistor 7 having the first resistive body portion 7a, the second resistive body portion 7b, and the third resistive body portion 7c is printed in a crank shape, thereby ensuring the overall length of the resistor and providing stable surge characteristics. In addition, even if the first trimming groove 21 and the second trimming groove 22 in an I-cut shape are formed with the outer edges of the second resistive body portion 7b and the third resistive body portion 7c of the resistor 7 as their starting positions to adjust the resistance value, the main current path after the resistance value adjustment becomes long without having a turn portion, so that the surge characteristics can be further improved while reducing the adverse effects on characteristics caused by microcracks, and a small, high-power compatible chip resistor can be realized.

[0054] The present invention is not limited to the above-mentioned embodiment, and various modifications are possible without departing from the gist of the present invention, and all technical matters included in the technical ideas described in the claims are the subject of the present invention. The above-mentioned embodiment shows a preferred example, but a person skilled in the art can realize various alternatives, modifications, variations, or improvements from the contents disclosed in this specification, and these are included in the technical scope described in the attached claims.

[0055] For example, in each of the above embodiments, the first front electrode 3, the second front electrode 4, the first back electrode 5, and the second back electrode 6 are each formed along the long side of the insulating substrate 2, but they may also be formed along the short side of the insulating substrate 2.

[0056] In addition, in each of the above embodiments, the width dimension W2 of the second resistor portion 7b and the width dimension W3 of the third resistor portion 7c in the resistor 7 are equal, but W2 and W3 may be slightly different in dimension as long as the width dimension W1 of the first resistor portion 7a is greater than the width dimensions W2, W3 of the second resistor portion 7b and the third resistor portion 7c (W1>W2, W3). [Explanation of symbols]

[0057] 1,20 Chip resistor 2. Insulating substrate 3 Table 1 Electrodes 4 Table 2 Electrodes 5 First back electrode 6 Second back electrode 7 Resistor 7a 1st resistor part 7b 2nd resistor part 7c 3rd resistor part 8 Undercoat layer 9. Overcoat 10 Edge electrode 11 External electrode 12 First trimming 12a Coarse adjustment section 12b Fine adjustment section 13 Second trimming groove 14 Barrier Layer 15 External connection layer 21 First trimming 22 Second trimming groove A First Straight Line B Second straight line D interval E1, E2 Main current path

Claims

1. A chip resistor comprising: a rectangular parallelepiped insulating substrate; first and second electrodes disposed opposite each other at both ends of the insulating substrate with a fixed gap therebetween; and a resistor disposed at the gap and bridging between the first and second electrodes, the resistor having a first trimming groove and a second trimming groove for adjusting a resistance value formed therein, the resistor has a rectangular first resistor portion extending parallel to the first electrode and the second electrode, a rectangular second resistor portion extending from the first electrode toward the second electrode to a portion of the interval and connected to one side of the first resistor portion, and a third resistor portion extending from the second electrode toward the first electrode to a portion of the interval and connected to the other side of the first resistor portion, when a center of the first resistor portion is defined as point O, the first trimming groove and the second trimming groove are formed so as to have starting positions at opposing outer edge portions of the first resistor portion that are located at positions that are substantially point symmetrical with respect to point O, the end positions of the first trimming groove and the second trimming groove are set so as not to exceed a straight line that passes through the point O and extends parallel to the extension direction of the first electrode and the second electrode, and so as not to overlap on a straight line perpendicular to the extension direction of the first electrode and the second electrode. A chip resistor characterized in that

2. In claim 1, the first trimming groove and the second trimming groove are each an L-cut shape having a coarse adjustment portion that extends linearly from the starting end position toward the inside of the first resistor portion and a fine adjustment portion that bends from a tip of the coarse adjustment portion; A chip resistor characterized in that

3. In claim 2, The fine-adjustment portion of the first trimming groove and the fine-adjustment portion of the second trimming groove pass through the point O and extend to a position beyond a straight line perpendicular to an extension direction of the first electrode and the second electrode. A chip resistor characterized in that

4. In claim 2, The fine adjustment portion of the first trimming groove and the fine adjustment portion of the second trimming groove extend in directions away from each other. A chip resistor characterized in that

5. A chip resistor comprising: a rectangular parallelepiped insulating substrate; first and second electrodes disposed opposite each other at both ends of the insulating substrate with a fixed gap therebetween; and a resistor disposed at the gap and bridging between the first and second electrodes, the resistor having a first trimming groove and a second trimming groove for adjusting a resistance value formed therein, the resistor has a rectangular first resistor portion extending parallel to the first electrode and the second electrode, a rectangular second resistor portion extending from the first electrode toward the second electrode to a portion of the interval and connected to one side of the first resistor portion, and a third resistor portion extending from the second electrode toward the first electrode to a portion of the interval and connected to the other side of the first resistor portion, when a center of the first resistor portion is defined as point O, the first trimming groove and the second trimming groove are formed in an I-cut shape with their starting ends positioned at outer edges of the second resistor portion and the third resistor portion which are positioned substantially point-symmetrical with respect to point O, At least one of the first trimming groove and the second trimming groove passes through point O and extends to a position beyond a straight line perpendicular to an extension direction of the first electrode and the second electrode, the end positions of the first trimming groove and the second trimming groove are set so as not to exceed a straight line that passes through the point O and extends parallel to the extension direction of the first electrode and the second electrode, and so as not to overlap on a straight line perpendicular to the extension direction of the first electrode and the second electrode. A chip resistor characterized in that

Images