JP2006147832A - Variable resistor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a variable resistor capable of suppressing the size of height without generating breakage or crack in an insulating substance. <P>SOLUTION: The variable resistor is provided with a rotary shaft 2 for rotating operation, a fixing member 1 for retaining the rotary shaft 2 turnably, a sliding piece 14 turned in accordance with the rotation of the rotary shaft 2, the insulating substrate 5 with a resistor pattern 6 and a collector pattern 7 which are formed thereon to contact slidingly with the sliding piece 14, a plurality of terminals 8, 9 attached to the insulating substrate 5 so as to be conducted to the resistor pattern 6 as well as the collector pattern 7, and a retaining member 4 exposing the resistor pattern 6 as well as the collector pattern 7 at one surface side and embedded integrally into the insulating substrate 5 under a condition that the terminals 8, 9 are projected outwardly. In this case, the insulating substrate 5 is provided with a plurality of holes 5b for attaching the terminals 8, 9 respectively, and is provided with bulges 5c expanded into the deriving direction of the terminals 8, 9 at the deriving parts of the terminals 7, 8 on the insulating substrate 5 which are coping with the plurality of holes 5b. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a structure of a small variable resistor used in various electronic devices.

  A conventional variable resistor has a structure in which a resistive element substrate having terminals is integrally formed by insert molding in a case made of an insulating resin material such as a synthetic resin, and is slid onto the resistive film of the resistive element substrate in this case. A rotating body in which a sliding brush having a contact portion in contact is inserted is accommodated so that it can be rotated, and when the operating shaft is rotated, a set resistance value is known to change (for example, , See Patent Document 1).

  The structure of this conventional variable resistor is shown in FIGS. FIG. 8 is a sectional view of a conventional variable resistor, and FIG. 9 is a plan view of a resistance element substrate of the conventional variable resistor.

  In the figure, a horseshoe-shaped resistance film 52 made of carbon paint is formed on the upper surface of an insulating substrate 51 made of a phenol resin laminate and the like, and a ring-shaped current collecting portion 53 made of silver paint is electrically independent from the inner center. Printed concentrically, and lead portions 54 (54A, 54B) and 55 are printed with silver paint on both ends of the resistance film 52 and the ring-shaped current collecting portion 53, and are drawn out to the outside. Terminals 56 (56A, 56B) and 57 are fixed by crimping to 54 (54A, 54B) and 55, respectively.

  Next, a variable resistor using the resistance element substrate 60 will be described with reference to the cross-sectional view of FIG. 8. In the resistance element substrate 60, each printed layer is formed on an insulating resin case 61 having an upper opening. It is fixed by insert molding or the like with the other side facing the opening. The rotating body 62 is accommodated in the concave portion of the case 61, and the lower circular protrusion 62B provided on the lower center surface of the flange portion 62A is inserted and held in the central circular hole 61A of the case 61.

On the other hand, the opening portion of the case 61 is covered with a cover 63 in which a leg portion 63A is held and crimped on the lower surface of the case 61. The bearing portion 63B of the cover 63 is formed on the central upper surface of the flange portion 62A of the rotating body 62. An operation shaft 62C provided in a projecting manner is pivotally supported so as to project the distal end portion outward and can be rotated.
A sliding brush 64 having contact portions 64A and 64B that elastically slide on the resistance film 52 and the ring-shaped current collecting portion 53 of the resistance element substrate 60 is attached to the flange portion 62A of the rotating body 62. .

  The variable resistor configured as described above rotates the operating body 62C by rotating the operating shaft 62C with a constant voltage applied between the terminals 56A and 56B, and as shown by the arrow in FIG. The contact portions 64A and 64B of the sliding brush 64 mounted on the terminal are elastically slid on the resistance film 52 and the ring-shaped current collecting portion 53, respectively, and the terminals 56A and 57 are connected to each other at a predetermined operation angle position of the operation shaft 62C. The voltage between them is taken out as an output voltage.

JP 2000-260608 A

  In the structure of the conventional variable resistor, in order to reduce the height dimension of the variable resistor, the height dimension of the insulating substrate 51 is reduced and the holes to which the terminals 56 and 57 are attached and the end face of the insulating substrate 51 However, in this method, it is difficult to reduce the height dimension because it is clear that cracks and cracks occur around the holes in the insulating substrate during the drilling process. There was a problem that there was.

  Accordingly, an object of the present invention is to solve the above-described problems and to provide a variable resistor capable of suppressing the height dimension without cracking or cracking the insulating substrate.

  In order to solve the above-described problems, the present invention provides, as a first solution, a rotating shaft that is rotated, a fixing member that rotatably holds the rotating shaft, and a sliding that rotates as the rotating shaft rotates. And an insulating substrate on which a resistor pattern and a current collector pattern with which the slider is slidably contacted are formed, and a plurality of conductors that are electrically connected to the resistor pattern and the current collector pattern and attached to the insulating substrate. A terminal and a holding member in which the insulating substrate is integrally embedded with the resistor pattern and the current collector pattern exposed to one side and the terminal protruding outward. Is provided with a plurality of holes to which the terminals are respectively attached, and a bulging portion that bulges in the lead-out direction of the terminal is provided in the lead-out portion of the terminal of the insulating substrate corresponding to the plurality of holes. It was.

Further, as a second solving means, the outer shape of the bulging portion is formed in an arc shape along the inner diameter of the hole.
Further, as a third solving means, the holding member has a shape of a surface on which the terminal protrudes, and a portion from which the terminal protrudes is formed in a convex shape corresponding to the bulging portion of the insulating substrate, A portion located between the terminals was formed in a concave shape.
As a fourth solving means, the holding member or the fixing member is provided with at least a pair of protrusions at a position apart from the lead-out portion of the terminal and on a side end of the surface from which the terminal protrudes. The configuration was provided.
As a fifth solution, the thickness dimension of the insulating substrate is T, the dimension from the inner peripheral edge of the hole in the lead-out direction of the terminal of the insulating substrate to the tip of the bulging portion is B, and the inner diameter of the hole When the dimension in the lead-out direction of the terminal from the peripheral edge to the peripheral edge when the bulging part of the insulating substrate is removed is A, each dimension is A <T <B.

  As described above, the variable resistor of the present invention includes a rotary shaft that is rotated, a fixed member that rotatably holds the rotary shaft, a slider that rotates as the rotary shaft rotates, and a slider. An insulating substrate on which a resistor pattern and a current collector pattern that are in sliding contact with each other, a plurality of terminals that are electrically connected to the resistor pattern and the current collector pattern and are attached to the insulating substrate, and a resistor pattern and a current collector It is provided with a holding member in which an insulating substrate is integrally embedded in a state where the pattern is exposed to one side and the terminal protrudes outward, and the insulating substrate is provided with a plurality of holes for attaching the terminal, Because the terminal lead-out portion of the insulating substrate corresponding to the plurality of holes is provided with a bulging portion that bulges in the terminal lead-out direction, the distance from the hole to the end surface of the insulating substrate is increased so that the position of the hole is Up to the end face of the corresponding insulating substrate Away can be maintained, it is possible to prevent the breakage and cracks enter when drilling holes.

Moreover, since the outer shape of the bulging portion is formed in an arc shape along the inner diameter of the hole, the distance from the hole to the end surface of the insulating substrate can be made almost uniform along the inner diameter of the hole, so that more cracks, cracks, etc. Is difficult to enter.
Further, the holding member has a shape of a surface on which the terminal protrudes, a portion where the terminal protrudes is formed in a convex shape corresponding to the bulging portion of the insulating substrate, and a portion located between the terminals is formed in a concave shape. Therefore, since the concave portion located between the terminals can be used as a flux pool during soldering, the bottom surface of the holding member can be brought into contact with or close to the board surface of the printed circuit board to be mounted. The height of the vessel can be reduced.
In addition, since the holding member or the fixing member is provided with at least a pair of protrusions at a position away from the terminal lead-out portion and on the side end of the surface from which the terminal protrudes, Even if it provides, it can position reliably.
In addition, the thickness dimension of the insulating substrate is T, the dimension from the inner peripheral edge of the hole in the lead-out direction of the insulating substrate to the tip of the bulging portion is B, and the bulging portion of the insulating substrate is excluded from the inner peripheral edge of the hole. Assuming that the dimension in the lead-out direction of the terminal to the peripheral edge in the case is A, each dimension is A <T <B. And cracks can be prevented.

  Embodiments of the present invention are shown in FIGS. 1 is a schematic cross-sectional view showing a variable resistor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1 with the first slider omitted, and FIG. 4 is a front view showing the holding member of the variable resistor, FIG. 4 is a bottom view showing the holding member of the variable resistor of the present invention, FIG. 5 is a cross-sectional view showing the holding member of the variable resistor of the present invention, and FIG. FIG. 7 is a front view showing an insulating substrate of the variable resistor, FIG. 7 is a rear view showing the insulating substrate of the variable resistor of the present invention, and a partial side view (left side).

  In the figure, the variable resistor of the present invention is configured such that a click portion, a variable resistor portion, and a switch portion are connected to each other around the rotation shaft 2 rotatably held by the bearing 1. The switch unit turns on / off the power supply. When the switch is on, the variable resistor unit adjusts the set resistance value. Furthermore, the click unit causes a click feeling during operation. ing.

  As shown in FIG. 1, the bearing 1 is formed of an insulating material such as synthetic resin or zinc die-casting, and constitutes a part of a fixing member, and a cylindrical portion 1a having a through hole in the center. The rotating shaft 2 is rotatably held by the cylindrical portion 1a. Further, a substantially circular concave portion 1b is provided on the rear end side of the cylindrical portion 1a, and a base portion 2c of the rotating shaft 2 described later is rotatably accommodated in the concave portion 1b. Further, a stopper portion 1c protruding into the recess 1b is formed at one end (the lower end in the present embodiment) of the inner peripheral surface of the recess 1b.

  The rotating shaft 2 is made of aluminum, zinc die cast, synthetic resin or the like, and has a cylindrical shaft portion 2a held by the cylindrical portion 1a and a cross section D provided at the tip of the shaft portion 2a. A character-shaped operation portion 2b, a bowl-shaped base portion 2c provided at the rear end of the shaft portion 2a and accommodated in the concave portion 1b of the bearing 1, and a cross section extending rearward of the base portion 2c is noncircular And a prismatic drive section 2d (substantially rectangular in this embodiment). The base portion 2c is provided with a stopper portion (not shown) that protrudes from one end of the outer peripheral portion in a direction (radial direction) orthogonal to the axial direction of the shaft portion 2a.

Although not shown, when the rotating shaft 2 rotates by a predetermined angle, a stopper portion (not shown) of the rotating shaft 2 comes into contact with the stopper portion 1c formed in the concave portion 1b of the bearing 1 and further rotates. Is to regulate.
A click leaf spring 3 is attached to the base portion 2 c of the rotating shaft 2. A convex bulge 3a is formed at the tip of the click leaf spring 3, and this bulge 3a and a click convex (not shown) provided on the holding member 4 to be described later are provided. Is caused to cause a click feeling when the rotary shaft 2 is rotated.

  A holding member 4 formed in an approximately rectangular shape from an insulating material such as synthetic resin is engaged with the rear end of the bearing 1. As shown in FIGS. 3 to 5, the holding member 4 has an insertion hole 4 a through which the driving portion 2 d of the rotating shaft 2 is inserted at the center, and is opposed to the one surface side across the insertion hole 4 a. On the other surface side, circular housing recesses 4b and 4c are provided, respectively. An insulating substrate 5 is integrally embedded in the central portion of the holding member 4 by a method such as insert molding.

  As shown in FIGS. 6 and 7, the insulating substrate 5 is formed in a substantially rectangular flat plate shape from an insulating resin material such as phenol resin or epoxy resin, and has a circular insertion hole 5a at the center. Is provided. Also, on one surface side of the insulating substrate 5, there are an arc-shaped resistor pattern 6 made of a conductive paste such as carbon and an annular current collector pattern 7 made of a silver paste so as to surround the insertion hole 5a. It is formed by a method such as printing. Then, both end sides of the arc-shaped resistor pattern 6 are led out to one end side of the insulating substrate 5 to form a pair of electrode portions 6 a and 6 a, and the annular current collector pattern 7 is formed on the insulating substrate 5. An electrode portion 7a is formed by being led out to one end side.

  The insulating substrate 5 on which the electrode portions 6a and 7a are located is provided with a plurality (three in this embodiment) of circular holes 5b to which connection terminals (terminals) 8 and 9 to be described later are fixed. The lead-out portions of the connection terminals 8 and 9 of the insulating substrate 5 where the plurality of holes 5b are located are provided with a plurality of bulge portions 5c that bulge in the lead-out direction of the connection terminals 8 and 9. Yes. The bulging portions 5c are formed such that the outer shape of the bulging portion 5c is an arc shape along the inner diameter of the hole 5b. In the present embodiment, the bulging portion 5c has an arc shape having substantially the same radius as the circular hole 5b, and the center of the arc is located below the center of the hole 5b in FIG. It has become. In this case, the arc surface is formed so as to be concentric with the hole 5b by making the center of the arc of the bulging portion 5c coincide with the center of the hole 5b and making the radius larger than that of the hole 5b. The arc shape of the bulging portion 5c may not be a perfect arc shape as long as the arc shape substantially conforms to the shape of the hole 5b.

Further, in this case, as shown in FIG. 7, the relationship between the formation positions of the holes 5b and the bulging portions 5c is that the thickness dimension of the material of the insulating substrate 5 is T (in this embodiment, T = 0. 8 mm phenol laminate), B is the dimension from the inner peripheral edge of the hole 5b in the lead-out direction of the lead-out part of the connection terminals 8 and 9 of the insulating substrate 5 to the tip of the bulging part 5c, and the hole The lead-out direction (that is, B dimension) of the connection terminals 8 and 9 from the inner peripheral edge of 5b (the lowest part of the hole 5b in FIG. 7) to the peripheral edge when the bulging part 5c of the insulating substrate 5 is removed. When the dimension in the linear direction (parallel to) is A, each dimension is formed such that A <T <B.
In this case, the inventor has confirmed that when the dimension B is smaller than the thickness dimension T of the material of the insulating substrate 5, cracks, cracks, and the like are likely to occur during drilling.

Thus, even if the dimension A in the longitudinal direction of the insulating substrate 5 is reduced by forming the hole 5b and the bulging portion 5c, the dimension from the hole 5b to the end surface of the insulating substrate 5 can be reduced by the dimension B. Since the distance to the end surface of the insulating substrate 5 corresponding to the position of the hole 5b can be maintained, it is possible to prevent cracks and cracks from entering when the hole 5b is opened. It has become.
Further, since the outer shape of the bulging portion 5c is formed in an arc shape along the inner diameter of the hole 5b, the distance from the hole 5b to the end surface of the insulating substrate 5 is set along the inner diameter of the hole 5b. Since it can be made almost uniform, cracks and cracks are less likely to enter.

  Further, as shown in FIG. 2, the resistor pattern 6 and the current collector pattern 7 are exposed in the housing recess 4b on one side of the holding member 4 (the rear side in the present embodiment). It is arranged. In addition, the lower end side of the holding member 4 is connected to the resistor pattern 6 and the current collector pattern 7 and is fixed to the electrode portions 6a and 7a of the insulating substrate 5 by eyelet caulking. Connection terminals 8 and 9 made of a conductive metal plate protrude. The connection terminals 8 and 9 are formed integrally with the holding member 4 together with the insulating substrate 5 by a method such as insert molding.

  In addition, the holding member 4 has the bottom surface on the side from which the connection terminals 8 and 9 protrude, and the bulge of the insulating substrate 5 embedded in the portion where the connection terminals 8 and 9 protrude. Corresponding to the part 5c, it is formed in a convex shape having a bulging part 4d, and other parts (of the connection terminals 8, 9) located between the connection terminals 8 and 9 and outside the connection terminal 8 The portions located on both sides are formed in a concave shape having a groove 4e. Further, the convex bulging portion 4 d and the concave groove portion 4 e are formed continuously in the axial direction of the rotating shaft 2.

  In this way, the shape of the bottom surface portion of the holding member 4 on the side where the connection terminals 8 and 9 protrude is formed, and the portion where the connection terminals 8 and 9 protrude corresponds to the bulging portion 5 c of the insulating substrate 5. Since the portions located between the connection terminals 8 and 9 and outside the connection terminal 8 are formed in a concave shape, the concave portions located between the connection terminals 8 and 9 and outside the connection terminal 8 are formed. Since it can be a flux pool at the time of soldering, the bottom surface of the holding member 4 can be brought into contact with or close to the plate surface of a printed circuit board on which an electronic device (not shown) is mounted. It can be made smaller.

Further, the bottom surface of the holding member 4 has a portion where the connection terminals 8 and 9 are led out, that is, a position away from the convex bulge 4d and a surface from which the connection terminals 8 and 9 protrude. A pair of protrusions 4f are formed at the side ends. These protrusions 4f are formed so as to be the same as or slightly higher than the height of the convex bulge 4d, and the variable resistor is an electronic device not shown. When mounted on the printed circuit board, the protrusion 4f abuts at an appropriate position, so that even if the bulging portion 5c is provided on the insulating substrate 5, it can be positioned reliably. .
The pair of protrusions 4f may be provided on a fixing member such as the bearing 1 instead of being provided on the holding member 4.

  Moreover, although not shown in figure, it protrudes from the surface of the said accommodation recessed part 4c in the said accommodation recessed part 4c of the other surface side (front side in a present Example) facing the said accommodation recessed part 4b of the said holding member 4. The click convex portion is integrally formed. The click protrusion is engaged with and disengaged from the bulging portion 3a of the click leaf spring 3 attached to the base portion 2c of the rotary shaft 2 to provide a click feeling when the rotary shaft 2 is rotated. It is something to be born.

  In this case, although not shown, the click convex portion is provided corresponding to the position of the starting end of the arc-shaped contact pattern 11a of the fixed contact 11 provided on the contact board 10 of the rotary switch described later. After the bulging portion 3a gets over the click convex portion and a click feeling is generated, the second slider 15 of the rotary switch conducts with the contact pattern 11a and the switch is turned on. It is set to be.

  Further, a contact board 10 formed in a substantially rectangular shape from an insulating material such as synthetic resin, which constitutes a part of the fixing member, is engaged with the rear end of the holding member 4. The contact board 10 has an insertion hole 10a through which the drive part 2d of the rotating shaft 2 is inserted in the center, and a circular accommodation recess 10b is provided on one surface side of the insertion hole 10a.

  In addition, a fixed contact 11 made of a conductive metal plate is integrally embedded in the center portion of the contact substrate 10 by a method such as insert molding, and the accommodation recess 10b of the contact substrate 10 includes An arc-shaped contact pattern 11a having an open bottom and a continuous annular common pattern 11b are exposed. Further, a connection terminal 12 led out from the contact pattern 11a and the common pattern 11b is provided on the lower end side of the contact board 10 so as to protrude.

  The slider receiver 13 is made of an insulating material such as a synthetic resin, and the drive section 2d of the rotary shaft 2 is inserted into the center of the slider receiver 13 so that the cross section of the drive section 2d can be rotated integrally with the rotary shaft 2. A shaft portion 13b having a substantially rectangular fitting hole 13a having the same non-circular shape and a disc portion 13c provided in a disc shape at the center of the shaft portion 13b. Moreover, the 1st slider 14 and the 2nd slider 15 which consist of an electroconductive thin metal plate which has elasticity are provided in the one surface side and other surface side of this disc part 13c, and it shows in FIG. As described above, the insulating substrate 5 and the contact substrate 10 are disposed to face each other with the slider receiver 13 interposed therebetween.

  In the slider receiver 13, the fitting hole 13 a of the shaft portion 13 b is fitted into the driving portion 2 d of the rotating shaft 2, and the housing recess 4 b of the holding member 4 and the housing recess 10 b of the contact substrate 10 are formed. It is accommodated rotatably in the accommodation space formed by. The first slider 14 provided on one side of the disk portion 13c is in sliding contact with the resistor pattern 6 and the current collector pattern 7 of the insulating substrate 5 embedded in the holding member 4. Further, the second slider 15 provided on the other surface side of the disk portion 13c is in sliding contact with the contact pattern 11a and the common pattern 11b provided to be exposed on the contact substrate 10. It has become.

  As described above, the first slider 14 and the second slider 15 are provided on one side and the other side of the slider receiver 13, and the insulating substrate 5 and the contact substrate 10 are provided. Can be shared without providing the first and second sliders 14 and 15 separately, Miniaturization is possible, and it is possible to cope with low cost.

  An attachment plate 16 made of a rectangular metal plate or the like is attached to the rear end side of the contact substrate 10 by a plurality of attachment pins (not shown). The holding member 4 and the contact board 10 are sandwiched and held between the mounting plate 16 and the bearing 1 by the mounting pin, thereby constituting the variable resistor of the present invention.

  The variable resistor of the present invention has the above-described configuration. When the rotary shaft 2 is rotated, the click leaf spring 3 attached to the base portion 2c of the rotary shaft 2 constitutes a click portion. When the bulging portion 3a is engaged with the click convex portion (not shown) provided in the receiving concave portion 4c of the holding member 4 and the bulged portion 3d gets over the click convex portion, the switch is turned on. The click feeling can be obtained. Then, after the click feeling is generated, the contact pattern 11 a and the common pattern 11 b provided on the contact board 10, which constitute the switch unit, are provided in the second slider provided on the slider receiver 13. The switch is turned on by sliding contact with 15 and conducting.

  Next, when the rotating shaft 2 is further rotated, the resistor pattern 6 and the current collector pattern 7 of the insulating substrate 5 embedded in the holding member 4 constituting the variable resistor portion are The set resistance value of the resistor pattern 6 varies in sliding contact with the first slider 14 provided on the slider receiver 13.

  According to the above-described embodiment of the present invention, the insulating substrate 5 on which the resistor pattern 6 and the current collector pattern 7 that are in sliding contact with the first slider 14 that rotates with the rotation of the rotating shaft 2 are formed. A plurality of connection terminals 8 and 9 attached to the insulating substrate 5 in conduction with the resistor pattern 6 and the current collector pattern 7 respectively, and the resistor pattern 6 and the current collector pattern 7 are exposed on one side. And the holding member 4 in which the insulating substrate 5 is integrally embedded in a state where the connection terminals 8 and 9 protrude outward, and the connection terminals 8 and 9 are provided on the insulating substrate 5 respectively. A plurality of holes 5b to be attached are provided, and a bulging portion that bulges in the lead-out direction of the connection terminals 8 and 9 at the lead-out portion of the connection terminals 8 and 9 of the insulating substrate 5 corresponding to the plurality of holes 5b. Since 5c is provided, from the hole 5b The distance to the end surface of the insulating substrate 5 can be increased to maintain the distance to the end surface of the insulating substrate 5 corresponding to the position of the hole 5b, and cracks, cracks, etc. are generated when the hole 5b is opened. Can be prevented.

It is sectional drawing which shows the variable resistor which concerns on the Example of this invention. It is sectional drawing in the 2-2 line of FIG. 1 which abbreviate | omits and shows the 1st slider of this invention. It is a front view which shows the holding member of the variable resistor of this invention. It is a bottom view which shows the holding member of the variable resistor of this invention. It is sectional drawing which shows the holding member of the variable resistor of this invention. It is a front view which shows the insulation board | substrate of the variable resistor of this invention. It is the rear view and partial side view which show the insulated substrate of the variable resistor of this invention. It is sectional drawing which shows the conventional variable resistor. It is a top view which shows the resistive element board | substrate of the conventional variable resistor.

Explanation of symbols

1: Bearing (fixing member)
DESCRIPTION OF SYMBOLS 1a: Cylindrical part 1b: Concave part 1c: Stopper part 2: Rotating shaft 2a: Shaft part 2b: Operation part 2c: Base part 2d: Drive part 3: Leaf spring for click 3a: Expansion part 4: Holding member 4a: Insertion Hole 4b: Housing recess 4c: Housing recess 4d: Swelling portion 4e: Groove 4f: Projection 5: Insulating substrate 5a: Insertion hole 5b: Hole 5c: Swelling portion 6: Resistor pattern 6a: Electrode portion 7: Current collector Body pattern 7a: Electrode part 8: Connection terminal (terminal)
9: Connection terminal (terminal)
DESCRIPTION OF SYMBOLS 10: Contact board | substrate 10a: Insertion hole 10b: Housing recessed part 11: Fixed contact 11a: Contact pattern 11b: Common pattern 12: Connection terminal 13: Slider receptacle 13a: Fitting hole 13b: Shaft part 13c: Disk part 14: 1st 1 slider 15: second slider 16: mounting plate

Claims (5)

  A rotating shaft that is rotated, a fixing member that rotatably holds the rotating shaft, a slider that rotates as the rotating shaft rotates, and a resistor pattern and a current collector that are in sliding contact with the slider An insulating substrate on which a pattern is formed, a plurality of terminals that are respectively connected to the resistor substrate and the current collector pattern and attached to the insulating substrate, and the resistor pattern and the current collector pattern are arranged on one side. And a holding member in which the insulating substrate is integrally embedded in a state where the terminal protrudes outward, and the insulating substrate is provided with a plurality of holes for attaching the terminals, A variable resistor, wherein a bulging portion bulging in a direction in which the terminal is led out is provided in a lead-out portion of the terminal of the insulating substrate corresponding to a plurality of holes.   The variable resistor according to claim 1, wherein an outer shape of the bulging portion is formed in an arc shape along an inner diameter of the hole.   The holding member has a shape of a surface on which the terminal protrudes, a portion from which the terminal protrudes is formed in a convex shape corresponding to the bulging portion of the insulating substrate, and a portion located between the terminals is formed in a concave shape. 3. The variable resistor according to claim 1, wherein the variable resistor is formed as follows.   The holding member or the fixing member is provided with at least a pair of protrusions at a position away from a lead-out portion of the terminal and on a side end of a surface from which the terminal protrudes. The variable resistor according to any one of 1 to 3. The thickness dimension of the insulating substrate is T, the dimension from the inner peripheral edge portion of the hole in the lead-out direction of the terminal of the insulating substrate to the tip of the bulging portion is B, and the swelling of the insulating substrate from the inner peripheral edge portion of the hole. 5. Each of the dimensions according to claim 1, wherein each dimension is A <T <B, where A is the dimension in the lead-out direction of the terminal up to the peripheral end when the protruding part is excluded. The variable resistor described in 1.

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