JP2009021455A - Variable resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable resistor capable of rapidly changing output characteristics in the middle by one variable resistor. <P>SOLUTION: The variable resistor has an insulating substrate 10 with a roughly circular arcuate resistor 15 formed on the upper surface thereof and a slider 31 rotatably attached to the insulating substrate and provided with a plurality of contacts 32a-32c to slide on the resistor. An absent part 16 without the resistor is formed partially on the route of the resistor where at least one of the plurality of contacts passes through, and the resistors 15 on both sides are connected with each other through a high resistance part 17 holding the absent part there between. When the slider passes through the absent part, at least one of the plurality of contacts is brought into contact on the resistor, and a resistance value measured between the slider and one end side or the other end side of the resistor when the slider passes through the absent part is changed stepwise. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a variable resistor, and more particularly to a variable resistor in which a slider attached rotatably to an insulating substrate slides on a resistor on the insulating substrate to adjust the resistance value.

  Conventionally, as a rotary variable resistor provided with a slider, one described in Patent Document 1 is known. As shown in FIGS. 11 and 12, the variable resistor includes an insulating substrate 20 made of a resin molded product in which first to third terminals 22 to 24 are embedded. The first and third terminals 22 and 24 have one end portions 22 a and 24 a protruding from the side surface of the substrate 20, and the other end portions 22 b and 24 b exposed on the surface of the substrate 20. Both ends 23a and 23b of the second terminal 23 protrude from the opposite side surfaces of the substrate 20, and the central portion is exposed at the center of the surface of the substrate 20 as an annular current collector 23c. A substantially annular resistor 25 is formed concentrically with the current collector 23c on the upper surface of the substrate 20, and both ends of the resistor 25 are end portions 22b of the first and third terminals 22, 24, 24b is electrically connected.

  A rotation shaft 30 made of a resin molded product shown in FIG. 13 is rotatably mounted in the center hole 21 of the substrate 20. A slider 31 made of a conductive material is integrally fixed to the rotary shaft 30. A plurality of contacts 32 that slide on the resistor 25 and a plurality of contacts 33 that slide on the current collector 23 c are formed on the slider 31, and a second contact is formed according to the rotational position of the contact 32. The resistance value between the third terminals 23 and 24 is adjusted. A cover 40 made of a resin molded product is attached on the substrate 20 to cover the surfaces of the slider 31 and the resistor 25.

14 is a circuit diagram showing the relationship between the first to third terminals 22 to 24 and the resistor 25, and FIG. 15 shows the relationship between the rotational position of the slider 31 and the output voltage ratio. The output voltage ratio is the ratio between the second terminal 23 and the third terminal 24 when the slider 31 is rotated with the constant voltage V ₁₃ applied between the first terminal 22 and the third terminal 24. It represents the ratio (= V ₂₃ / V ₁₃ ) between the voltage V ₂₃ output from between and the voltage V ₁₃ . As shown in FIG. 15, the output voltage ratio changes proportionally according to the rotational positions Q1 to Q5 of the slider 31.

By the way, depending on the use of this type of variable resistor, it is desired to change the resistance value, that is, the output voltage ratio abruptly at a certain position within the rotation range of the slider 31, and to change it proportionally at other positions as usual. There is a case. In such a case, two variable resistors with different output characteristics can be prepared and these resistors can be switched with switches. However, the number of parts is complicated and the circuit is complicated, and switch switching is required. Therefore, there is a problem that the operation becomes troublesome.
JP 2003-124209 A

  Accordingly, an object of the present invention is to provide a variable resistor capable of changing output characteristics abruptly on the way with a single variable resistor.

  In order to achieve the above object, a variable resistor according to the present invention includes an insulating substrate having an arc-shaped resistor formed on an upper surface thereof, and is rotatably attached to the insulating substrate, and slides on the resistor. In a variable resistor comprising a slider having a plurality of contacts arranged in the width direction of the resistor, a part of the resistor is partially disposed on a path of the resistor through which at least one of the plurality of contacts passes. A non-notched portion is formed, and the resistors on both sides of the notched portion are connected to each other via a high-resistance portion, and the slider passes through the notched portion. The notch is formed so that at least one of the plurality of contacts contacts the resistor, and one end side of the slider and the resistor when the slider passes through the notch Alternatively, the resistance value measured between the other end side changes in a step shape.

  In the variable resistor according to the present invention, on the path of the resistor through which at least one of the plurality of contacts passes, a partially-excluded part having no resistor is formed, and both sides of the part are provided with the missing part in between Are connected to each other through a high resistance portion. The slider has a plurality of contacts arranged in the width direction of the resistor, and when the slider passes through the notch, at least one of the plurality of contacts passes on the notch. The other contact contacts on the resistor. In other words, since any one of the contacts is always in contact with the resistor, the slider and the resistor are always in a conductive state, and when the slider passes through the notched portion, an open state is caused. Can be resolved. Since the resistance value of the high resistance part is higher than that of the other resistor parts, measurement is made between the slider and one end or the other end of the resistor before and after the slider passes through the notched part. The resistance value to be changed changes stepwise. Therefore, the output characteristics of the variable resistor can be changed suddenly during the rotation of the slider.

  As a preferred embodiment, the notch extends at an acute angle with respect to the arrangement direction of the contact points of the slider from the inner peripheral side or the outer peripheral side of the resistor so as to cross a region through which all the contact points of the resistor pass. A straight notched portion may be used, and the high resistance portion may be formed on the outer peripheral side or the inner peripheral side from the path through which the contact of the slider passes. In this case, there is a step in the resistance value by the amount of the high resistance portion before and after the slider passes through the notched portion. Since the notch portion is a straight line inclined with respect to the arrangement direction of the contact points of the slider, when a plurality of contact points of the slider pass through the notch portion, at least one of them contacts the resistor. , It is possible to avoid a situation (open state) in which all the contacts are located on the notch. Since the high resistance part is formed in a bypass shape so as to bypass the outside or inside of the passage path of the slider, the high resistance part has no wear due to sliding contact with the slider and can be arbitrarily narrowed. it can. That is, since the resistance value of the high resistance portion can be arbitrarily increased, the step of the resistance value can be increased. Since the high resistance portion can be formed simultaneously with the arc-shaped resistor and in the same manner, the manufacturing cost is not increased.

  When an inclined notch is formed, the angle and width of the notch is set so that when the slider contacts pass through this notch, more than half of all contacts are on the resistor. It is desirable to set the contact angle and width. If a crank-shaped notch is provided, or if it is an inclined notch and its intersection angle is small (close to parallel to the contact arrangement direction) or if the width of the notch is wide, the contact is missing. When passing through the removal section, a situation occurs in which only the contact of less than half of the total number of contacts contacts the resistor. For example, in the case of a slider having three contact points, a situation may occur in which only one contact point contacts the resistor when passing through the notch. Since the contact resistance between the contact and the resistor increases exponentially as the number of contacts decreases, it is desirable that as many contacts as possible are in contact. In this embodiment, since more than half of the contacts are always in contact with the resistor, an increase in contact resistance that causes sliding noise can be minimized.

  As a preferred embodiment, the notch is a notch that extends in a crank shape from the inner or outer peripheral side of the resistor so as to cross the region through which all the contacts of the resistor pass, and the contact of the slider It is good also as a structure by which the high resistance part is formed in the outer peripheral side or the inner peripheral side from the path | route which passes. Also in this case, as in the case where the inclined notched portion is provided, a situation (open state) in which all the contacts are located on the notched portion can be avoided, and the resistance value of the high resistance portion can be increased. The step of the value can be increased, and the manufacturing cost is not increased.

  As described above, not only the combination of the notch part and the bypass-like high resistance part, but the notch part is formed at the inner peripheral side edge, outer peripheral side edge of the resistor, or the intermediate position in the width direction, and slides. A high resistance portion may be formed on a path through which the contact of the child passes. In this case, since it is not necessary to form a bypass-like high resistance portion outside the contact passage region, the insulating substrate can be reduced in size. In addition, it is necessary to align the high resistance portion and the contact of the slider in the radial direction so that at least one contact of the slider passes through the high resistance portion stably. As a formation position of the notch part, for example, an inner peripheral part or a notch part of the outer peripheral part of the resistor may be used, or a hole may be provided in the middle of the resistor.

  As described above, according to the present invention, on the path of the resistor through which at least one of the contact points of the slider passes, a partially-excluded part having no resistor is formed and the missing part is interposed. Resistances measured between the slider and one end or the other end of the resistor when the resistors on both sides are connected to each other via the high resistance portion and the slider passes through the notch Since the value changes stepwise, the output characteristic can be changed abruptly on the way with one variable resistor. Also, when the slider passes through the notched portion, at least one of the plurality of contacts contacts the resistor, thus preventing a malfunction such as an open state when the slider passes through the missing portion. it can.

  Hereinafter, preferred embodiments of the present invention will be described based on examples.

  The variable resistor according to the present embodiment includes an insulating substrate 10 made of a resin molded product, a rotary shaft 30 made of a resin molded product provided with a slider 31, and a cover 40 made of a resin molded product. Among these, since the configuration other than the substrate 10 is the same as that of the conventional structure described in FIGS. 11 and 13, the same reference numerals are given and redundant description is omitted.

  As shown in FIG. 1, the board | substrate 10 has the center hole 11, and the 1st-3rd terminals 12-14 are embed | buried. The first and third terminals 12 and 14 have one end portions 12 a and 14 a protruding from the side surface of the substrate 10, and the other end portions 12 b and 14 b exposed on the surface of the substrate 10. Both ends 13a and 13b of the second terminal 13 protrude from the opposing side surfaces of the substrate 10, and the central portion is exposed at the center of the surface of the substrate 10 as an annular current collector 13c. On the upper surface of the substrate 10, a substantially annular (horse-shoe-shaped) resistor 15 lacking a part is formed concentrically with the current collector 13c, and both ends of the resistor 15 are first and third terminals. 12 and 14 are electrically connected to end portions 12b and 14b.

  A rotating shaft 30 having a slider 31 made of a conductive material is rotatably mounted in the center hole 11 of the substrate 10 (see FIG. 11). A plurality of contacts 32 that slide on the resistor 15 and a plurality of contacts 33 that slide on the current collector 13 c are formed on the slider 31. In this embodiment, the number of contacts 32 sliding on the resistor 15 is three, and these contacts 32 are arranged in a line in the width direction of the resistor 15 (the normal direction of the resistor 15).

  At the intermediate portion of the resistor 15 formed on the upper surface of the substrate 10, as shown in FIG. 2, the contacts of the slider 31 from the inner peripheral side of the resistors 15 so as to cross the passage paths of all the contacts 32. A linear notch or notch 16 extending at an acute angle with respect to the arrangement direction is formed. In order to simplify the drawing, the resistor 15 is shown in a straight strip shape in FIG. On the outer peripheral side of the notch 16, a bypass-like high resistance part 17 that connects the resistors 15 on both sides of the notch 16 is formed. The high resistance portion 17 is made of the same material as that of the resistor 15 and is formed at the same time, and its width dimension d is smaller than the width dimension D of the resistor 15, so that the resistance value per unit length of the high resistance portion 17 is a resistance value. Greater than that of body 15. The angle θ and the width dimension W of the notch 16 are such that when more than half of the total number of contacts can contact the resistor 15 when the contact 32 of the slider 31 passes through the notch 16. Is set to That is, when the number of contacts is 3, the angle θ and the width dimension W of the notch 16 are set so that at least two or more contacts 32 are always in contact with the resistor 15.

  The positional relationship between the missing portion 16 and each contact 32 (32a to 32c) will be described with reference to FIG. The slider 31 rotates from the rotation position P1 to P5. At the rotational position P1, the three contact points 32a to 32c arranged in the radial direction are all in contact with the resistor 15 on the upstream side in the rotational direction. At the rotational position P2, only the outer contact 32a is on the notch 16 and the other contacts 32b, 32c are on the upstream resistor 15. Further, at the rotational position P3, only the central contact 32b is on the notch 16, the outer contact 32a is in contact with the downstream resistor 15, and the inner contact 32c is in contact with the upstream resistor 15. Yes. That is, the contacts 32a and 32c on both sides are in contact with the resistor 15 located on both sides of the notch 16 therebetween. At the rotational position P4, only the inner contact 32c is on the notch 16 and the other contacts 32a, 32b are on the downstream resistor 15. Further, at the rotational position P5, all the three contacts 32a to 32c are transferred onto the resistor 15 on the downstream side. As described above, as the slider 31 rotates, the three contacts 32a to 32c sequentially move over the notched portion 16 of the resistor 15, and at that time, two or more contacts are always on the resistor 15. Since it is in contact with the contact, it is possible to eliminate the concern about the open state and to suppress an increase in contact resistance.

  FIG. 3 shows the relationship between the number of contact points and the contact resistance. As is apparent from FIG. 3, it can be seen that the contact resistance increases exponentially as the number of contact points decreases. That is, when the number of contacts is two, the increase in contact resistance can be suppressed as compared to three, but when the number is one, the contact resistance is greatly increased, which causes sliding noise. there is a possibility. As described above, by forming the oblique notched portion 16 so that the two contact points are always in contact with the resistor 15, the contact resistance can be reduced, and desirable output characteristics can be obtained.

FIG. 4 shows the relationship between the rotational position of the slider 31 and the output voltage ratio (= V ₂₃ / V ₁₃ ). As shown in FIG. 1, in the region A, the resistance value between the second terminal 13 and the third terminal 14 decreases proportionally according to the rotational position of the slider 31, so the output voltage ratio is proportional. Is decreasing. Since the resistance value between the second terminal 13 and the third terminal 14 is added only by the resistance value via the high resistance portion 17, the output voltage ratio is relatively high. As described above, in the region B, the contact 32 passes through the notch 16, so that a step is generated between the resistance value passing through the high resistance portion 17 and the resistance value not passing through the high resistance portion 17, and the output voltage ratio is Decreases rapidly. In the region B, the output voltage ratio decreases with a predetermined gradient, but in this region, the contacts 32a and 32c on both sides are in contact with both the resistors 15 as shown in the position P3 in FIG. Corresponds to the state. In the region C, the resistance value is lower by the amount of the high resistance portion 17 than in the region A, so that the output voltage ratio is low and the width dimension of the resistor 15 is the same as that in the region A. Decreases proportionally with the same slope. In this way, it is possible to obtain output characteristics in which the output voltage ratio changes abruptly during rotation and changes proportionally in other regions.

  In the above-described embodiment, the notch 16 is formed almost at the center (Q3) of the resistor 15. However, the position of the notch 16 is between Q1 to Q3 of the resistor 15 or between Q3 to Q5 in FIG. Any of them may be provided, and the missing portions 16 may be provided at a plurality of locations in the rotational direction. That is, in the output characteristics in FIG. 4, the stepped portion may be provided between the rotation positions Q1 to Q3 or between the rotation positions Q3 to Q5, and may be provided at a plurality of locations.

  In the above embodiment, the high resistance portion 17 that connects the resistors 15 on both sides of the notch portion 16 is provided outside the movement locus of the contact 32. However, if there is an empty space inside the resistor 15, the contact 32 is provided. It can also be provided inside the movement trajectory. In any case, since the contact 32 does not slide on the high resistance portion 17, the width of the high resistance portion 17 can be arbitrarily narrowed, and the resistance value can be arbitrarily higher than the resistance value of the resistor 15. That is, the step of the output characteristic can be increased.

  FIG. 5 shows a partially enlarged view of the resistor 15 in the second embodiment. In this embodiment, a notch 50 is formed in the resistor 15 so as to cross the region where all the contacts pass in a crank shape. A high resistance portion 51 is provided on the outer peripheral side of the path through which the contact 32 of the slider 31 passes to connect the resistor 15 on both sides of the notched portion 50 therebetween. Specifically, the inner opening portion 50a and the outer portion 50b of the lacking portion 50 are formed at different positions in the circumferential direction, and the passage portion 50c is connected therebetween. The radial direction position of the passage portion 50 c is formed at the center in the width direction of the resistor 15 so as to correspond to the center contact 32 b of the slider 31.

  At the rotational position P1, the three contacts 32a to 32c arranged in the radial direction are placed on the resistor 15 on the upstream side in the rotational direction, and at the rotational position P2, the two outer contacts 32a and 32b are missing. On the part 50, the inner contact 32c is on the upstream resistor 15. Further, at the rotational position P3, only the central contact 32b is on the notch 50, the outer contact 32a is on the downstream resistor 15, and the inner contact 32c is on the upstream resistor 15. . At the rotational position P4, the inner two contacts 32b and 32c are on the notch 50, and the outer contact 32a is on the downstream resistor 15. Further, at the rotational position P5, all the three contacts 32a to 32c are transferred onto the resistor 15 on the downstream side. As described above, since at least one contact is always on the resistor 15 while the contacts 32a to 32c of the slider 31 pass through the notch 50, it is possible to prevent the open state.

  FIG. 6 shows the insulating substrate 10 in the third embodiment. In this embodiment, a notch 60 made of a notch is formed on the inner periphery of the resistor 15, and the resistors 15 on both sides of the notch 60 are on a path through which the contact 32 a outside the slider 31 passes. Is formed. The high resistance portion 61 is formed narrower than the resistor 15. The broken line in FIG. 6 shows the movement path of the three contacts 32a to 32c of the slider 31, and when the two inner contacts 32b and 32c pass through the notch 60, the outer contact 32a is always high. Since it is in contact with the resistance portion 61, the concern of being in an open state can be eliminated. The number of contacts is not limited to three, and may be two or four or more. Further, the shape of the cut-out portion 60 is arbitrary, and may be a shape extending obliquely with respect to the contact arrangement direction as in the first embodiment.

  FIG. 7 shows an insulating substrate 10 in the fourth embodiment. In this embodiment, a notched portion 70 made of a notch is formed on the outer peripheral edge of the resistor 15, and a narrow high resistance portion 71 that connects the resistors 15 on both sides is formed on the inner peripheral side of the notched portion 70. ing. The broken line in FIG. 7 shows the movement path of the three contacts 32a to 32c of the slider 31, and when the two outer contacts 32a and 32b pass through the notch 70, the inner contact 32c is always high. Since it is in contact with the resistance portion 71, the concern of being in an open state can be eliminated.

  FIG. 8 shows an insulating substrate 10 in the fifth embodiment. In this embodiment, a notched portion 80 made of a hole is formed in the intermediate portion of the resistor 15 in the width direction, and a bifurcated high resistance portion 81 is formed on both sides of the notched portion 80 in the width direction. The broken lines in FIG. 8 indicate the movement paths of the three contacts 32 a to 32 c of the slider 31. When the central contact 32 b passes through the notch 80, the contacts 32 a and 32 c on both sides are always high resistance portions 81. Since it is in contact with the top, it is possible to eliminate the concern of being in an open state.

  FIG. 9 shows an insulating substrate 10 in the sixth embodiment. In this embodiment, a straight line extending acutely with respect to the arrangement direction of the contacts of the slider 31 so as to cross all the passage paths of the contacts 32a to 32c at the intermediate portion of the resistor 15 as in the first embodiment. A notched portion 90 is formed. The notched portion 90 has an acute angle when viewed from the opposite side of the first embodiment. Further, a bypass-shaped high resistance portion 91 that connects the resistor 15 on both sides of the notch portion 90 is formed on the outer peripheral side of the notch portion 90.

  In the sixth embodiment, as shown in FIG. 9, in addition to the notch portion 90 and the bypass-like high resistance portion 91 as the output characteristic setting means, the base electrode portion 92 and the routing high resistance portions 93 and 94 are provided. Forming.

  The base electrode portion 92 is disposed between the resistor 15 and the substrate 10, and is formed, for example, by applying an electrode material to the substrate 10. The resistor 15 is formed by covering the base electrode part 92 after the base electrode part 92 is applied. The portion where the base electrode portion 92 is formed is short-circuited by the base electrode portion 92, so that the resistance value does not change.

  The routing high resistance portions 93 and 94 are made of the same material as that of the resistor 15 and are formed at the same time. Since the width dimension is smaller than the width dimension of the resistor 15, the resistance value per unit length is the resistor 15. The resistance value is set to be higher by bending and pulling the wire. By forming the routing high resistance portions 93 and 94, the entire resistance value can be increased. Note that the resistance value may be further increased by using a material having higher resistance as the material of the routing high resistance portions 93 and 94.

FIG. 10 shows the relationship between the rotational position of the slider 31 and the output voltage ratio (= V ₁₂ / V ₁₃ ) in the sixth embodiment. The output voltage ratio here is the same as the first terminal 12 and the second terminal when the slider 31 is rotated with the constant voltage V ₁₃ applied between the first terminal 12 and the third terminal 14. It represents the ratio (= V ₁₂ / V ₁₃ ) between the voltage V ₁₂ output from between the terminals 13 and the voltage V ₁₃ .

  First, as shown in FIG. 10, when the contacts 32a to 32c of the slider 31 are at the rotational position Q1, the output voltage ratio at the rotational position Q1 is already at a predetermined height by the leading high resistance portions 93 and 94. It is a value. On the contrary, at the rotational position Q5, the height does not become higher than that due to the routing high resistance portions 93 and 94. Further, when the contacts 32a to 32c of the slider 31 are on the base electrode part 92, they are short-circuited by the base electrode part 92, so that the output voltage ratio hardly changes as shown in FIG. It has become.

The variable resistor according to the present invention is not limited to the above embodiment, and can be variously modified within the scope of the gist. For example, the current collector may not be a complete annular shape, but may be a substantially annular shape with a part missing. Further, the number of contact points of the slider is not limited to three and may be two or four or more.
In the above embodiment, the high resistance portion is formed of the same material as that of the resistor, but the high resistance portion may be formed of a resistance material different from that of the resistor. In this case, the step of the output characteristic can be arbitrarily set.
The slider is not limited to a variable resistor having a contact point where the slider slides on the resistor and a contact point which slides on the current collector as in the embodiment. For example, the slider is rotatably attached to the second terminal. It may be a variable resistor of the type. In this case, the attachment portion between the slider and the second terminal is an electrically conductive portion.

It is a top view of the 1st example of the insulating substrate used for the variable resistor concerning the present invention. It is a partial enlarged view of the resistor of the insulating substrate shown in FIG. It is a figure which shows the relationship between the number of contacts and contact resistance. It is an output characteristic figure which shows the relationship between the rotation position of the slider of 1st Example, and output voltage ratio. It is a partially expanded view of 2nd Example of a resistor. It is a top view of 3rd Example of an insulated substrate. It is a top view of 4th Example of an insulated substrate. It is a top view of 5th Example of an insulated substrate. It is a top view of 6th Example of an insulated substrate. It is an output characteristic figure which shows the relationship between the rotation position of the slider of 6th Example, and output voltage ratio. It is sectional drawing of the conventional variable resistor. It is a top view of the insulated substrate used for the variable resistor shown in FIG. It is a top view of the rotary body and slider which are used for the variable resistor shown in FIG. It is a circuit diagram which shows the relationship between the 1st-3rd terminal and a resistor. It is an output characteristic figure which shows the relationship between the rotation position of the slider of the conventional variable resistor, and output voltage ratio.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Insulation board | substrate 12-14 Terminal 13c Current collector 15 Resistor 16 Deletion part 17 High resistance part 30 Rotor 31 Slider 32, 32a-32c Contact

Claims (5)

An insulating substrate having a substantially arc-shaped resistor formed on the upper surface thereof, and a slide which is rotatably attached to the insulating substrate, slides on the resistor, and has a plurality of contacts arranged in the width direction of the resistor. In a variable resistor having a moving element,
On the path of the resistor through which at least one of the plurality of contacts passes, a notch portion that is partially free of a resistor is formed,
The resistors on both sides thereof are connected to each other through the high resistance portion with the lacking portion in between,
When the slider passes through the notched portion, the notched portion is formed such that at least one of the plurality of contacts contacts the resistor.
A variable in which a resistance value measured between the slider and one end side or the other end side of the resistor changes in a step shape when the slider passes through the notched portion. Resistor. The notch is a straight line extending at an acute angle with respect to the arrangement direction of the contacts of the slider from the inner or outer peripheral side of the resistor so as to cross a region through which all the contacts of the resistor pass. Is the shape of the missing part,
The variable resistor according to claim 1, wherein the high resistance portion is formed on an outer peripheral side or an inner peripheral side with respect to a path through which the contact of the slider passes. The angle and width of the notched portion are set to an angle and width at which more than half of the total number of contacts can contact the resistor when the contact of the slider passes through the notched portion. The variable resistor according to claim 2, wherein: The notched portion is a notched portion extending in a crank shape from the inner peripheral side or the outer peripheral side of the resistor so as to cross a region through which all the contacts of the resistor pass.
The variable resistor according to claim 1, wherein the high resistance portion is formed on an outer peripheral side or an inner peripheral side with respect to a path through which the contact of the slider passes. The notched portion is formed at an inner peripheral side edge, an outer peripheral side edge or a width direction intermediate position of the resistor,
The variable resistor according to claim 1, wherein the high resistance portion is formed on a path through which the contact of the slider passes.

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