JP2002299108A - Variable resistor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a variable resistor, a slider of which is improved in ease of assembling, and at the same time, is made to be cut off easily, by integrally forming the slider from a continuous body through a connecting section and cutting off the connecting section after the slider has been assembled with a rotor and which can prevent the remaining portion of the cut remaining section from interfering with a substrate. SOLUTION: A body section 51 of a slider 50 is formed, in a state where the section 51 is connected to the continuous body at a fixed interval via a connecting section 57. An annular wall section 47 is provided on the outer peripheral side of a slider-attaching section on the lower surface of a rotor 40 and the connecting section 57 is bent in a stepped state, so as to detour the wall section 47 of the rotor 40. An easily cut-off section 57a which can be cut off easily by bending is formed in the portion of the connecting section 57 near the body section 51 of the slider 50 inside the wall section 47.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable resistor used for hearing aids, measuring instruments, communication equipment, sensors and other industrial equipment, and more particularly to a small variable resistor.

[0002]

2. Description of the Related Art Conventionally, a substrate on which a current collecting electrode and an arc-shaped resistor centered on the current collecting electrode are formed on a top surface, a rotor rotatably disposed on the top surface of the substrate, and a rotor A main body attached to the lower surface, and a first body in contact with the current collecting electrode.
A variable resistor comprising: a slider integrally formed with a contact arm and a second contact arm in contact with the resistor; and a case that houses the substrate, the rotor, and the slider and holds the rotor rotatably. A vessel has been proposed (for example, JP-A-11-238607). In this type of variable resistor, the slider that constitutes the electrical contact, the current collecting electrode of the board, and the resistor are housed in a sealed case, so that external moisture and flux during mounting can be reduced. Intrusion can be prevented, and a highly reliable variable resistor can be configured.

By the way, the size of the variable resistor is also required to be small, and a small variable resistor of about 2 mm × 2 mm has been realized. In such a small variable resistor, the slider housed in the case is naturally smaller. However, since the slider is an individual component, it is necessary to pinch and assemble the rotor one by one with tweezers or the like in order to accurately align the rotor with the rotor in the rotational direction and assemble the rotor with accuracy, which is a problem.

[0004]

Therefore, a plurality of sliders are formed in a state of being connected to a continuum from a single metal plate via a connecting portion, and an easily bendable portion is formed in the connecting portion. Forming
A variable resistor has been proposed in which a slider is attached to a resistance substrate in a state of being connected to a continuous body, and then separated from the continuous body by a bendable and easy-to-separate portion (Japanese Utility Model Application Laid-Open No. 56-3430).
No. 2). In this case, since a plurality of sliders are continuously formed at a predetermined pitch interval, and these sliders are attached to a resistance board in which a plurality of the sliders are arranged, it is sufficient to separate them.
Automatic assembly of the slider becomes possible. If the above structure is applied to the case where the slider is attached to the rotor, a variable resistor having excellent assembling accuracy and assemblability can be realized.

[0005] By the way, annular walls are protruded from the lower surface of the rotor, and these walls are brought into contact with the upper surface of the substrate to restrict the bending allowance of the contact arm of the slider or to prevent the wall from being bent. A packing is interposed between the first contact arm and the upper surface of the substrate, and a seal is formed between the two to form a contact between the first contact arm and the current collecting electrode and an electric contact between the second contact arm and the resistor. Some prevent deterioration. When the annular wall portion is formed on the lower surface of the rotor in this manner, the main body of the slider is attached to the inside of the wall portion. May contact the substrate. Therefore, there arises a problem that the resistor of the substrate is damaged and the electrical characteristics are changed.

Accordingly, an object of the present invention is to improve the assemblability by integrally forming a slider from a continuous body via a connecting portion and disconnecting the connecting portion in a state where the slider is assembled with the rotor. And a variable resistor that can prevent the remaining portion from interfering with the substrate.

[0007]

The above object is achieved by the present invention. That is, according to the first aspect of the present invention, there is provided a substrate in which a current collecting electrode and an arc-shaped resistor around the current collecting electrode are formed on an upper surface, and a rotor rotatably disposed on the upper surface of the substrate. A slider integrally formed with a main body attached to the lower surface of the rotor, a first contact arm in contact with the current collecting electrode, and a second contact arm in contact with the resistor; A variable resistor comprising a case for accommodating a rotor and rotatably holding a rotor, wherein an annular wall portion is provided on a lower surface of the rotor and on an outer peripheral side from a slider mounting portion. The main body of the child is formed in a state of being connected to the continuum at a constant interval via a connecting portion, and the connecting portion is bent in a step shape so as to bypass the wall portion of the rotor, and the main body of the connecting portion and In the vicinity of the annular wall portion The site of the side, to provide a variable resistor, wherein a separating readily portion that easily disconnected is formed by bending.

When assembling this variable resistor, a plurality of sliders are continuously punched out from a single metal plate at regular intervals. A main body and first and second contact arms are formed on the slider, and the main body is connected to the continuous body via a connecting portion. An easy-to-separate portion that is easily separated by bending is formed in the vicinity of the connecting portion and the main body. Next, the slider is attached to the lower surface of the rotor while being connected to the continuous body. Since an annular wall portion is formed on the lower surface of the rotor, the connecting portion connecting the continuous body and the main body portion bypasses the wall portion so as to attach the slider to an area inside the wall portion. It is bent in steps. Since the slider can be attached to the rotor while being connected to the continuum, the slider can be automatically assembled to the rotor,
The assemblability is improved even with a small slider. After attaching the slider to the rotor, the slider is assembled to the rotor by disconnecting the connecting portion at the easily detachable portion. If the connection is cut using a mold or the like, the remaining portion may protrude outward from the annular wall of the rotor and interfere with the substrate or the case. On the other hand, in the present invention, since the easy-to-separate portion is formed near the body of the connecting portion and inside the annular wall, the remaining portion of the easy-to-separate portion is It remains inside the annular wall and does not protrude below the wall. Therefore, when the rotor to which the slider is attached is accommodated in the case together with the substrate, the uncut portion does not contact the substrate, and a highly reliable variable resistor can be obtained.

Preferably, the first contact arm and the second contact arm extend radially outward from different portions of the main body and are folded back below the main body. In the case of a small variable resistor, the spring property of the contact arm of the slider that contacts the current collecting electrode and the resistor poses a problem. If the spring force of the slider is insufficient,
Over a long period of time, contact reliability is reduced, and desired characteristics cannot be obtained. Therefore, a first contact arm contacting the current collecting electrode and a second contact arm contacting the resistor are protruded outward from the main body of the slider, and these contact arms are folded back below the main body. Even with a small slider, the spring properties of the contact arm can be ensured.

According to a third aspect of the present invention, the first contact arm extends substantially linearly outward in the radial direction from the main body, and a single contact portion is formed at a tip end thereof. May extend in a substantially arc shape radially outward from the main body, and a plurality of contact portions may be formed at a tip end thereof. As the shape of the second contact arm that is in sliding contact with the resistor, for example, a two-end supporting structure may be used as in JP-A-11-238607, but it is difficult to make contact with the resistor at multiple points due to the narrow width. . Therefore,
According to a third aspect of the present invention, the second contact arm is formed in an arc shape, a plurality of contact portions are formed at the distal end thereof, and the contact portions are bent below the main body to constitute a multi-contact type slider. I have. In this case, since the second contact arm has a cantilever structure, the spring coefficient can be reduced, and since it is a multi-contact type, the contact stability is high. On the other hand, since the first contact arm contacts the current collecting electrode at almost one point, there is no problem even if the spring coefficient is high. Therefore, the first contact arm has a substantially linear shape.

According to a fourth aspect of the present invention, the connecting portion extends in parallel with the first contact arm before being folded, and is formed on both sides thereof through a cutout for forming the arm. After the contact arm is folded downward with respect to the main body, the main body of the slider may be attached to the rotor while being connected to the continuum, and then the connecting portion may be disconnected. Since the metal plate constituting the slider is very thin and has spring properties, the supporting strength of the slider is low and the position is not stable. for that reason,
The assembling accuracy when assembling to the rotor is likely to deteriorate. According to the fourth aspect, since two connecting portions are provided and extend substantially in parallel with the first contact arm, the sliding portion does not interfere with the first contact arm and the second contact arm, and slides via the short connecting portion. Children can be linked. Therefore, the supporting strength of the connecting portion is increased, and the assembling accuracy when assembling the slider with the rotor is increased.

It is preferable that the cutout for forming the first contact arm is longer than the connecting portion and extends to the position of the continuous body. by this,
The length of the connecting portion can be further reduced, and the supporting strength is improved.

According to a sixth aspect of the present invention, the wall of the rotor is preferably in contact with the outer peripheral portion of the resistor on the upper surface of the substrate via an annular packing. In other words, the variable resistor needs to seal the electrical contact portion so as to prevent moisture and solder flux from entering from the outside, but the annular wall formed on the rotor and the upper surface of the substrate as in claim 6 are required. If a packing is interposed between them, the contact portion between the current collecting electrode and the first contact arm and the contact portion between the resistor and the second contact arm can be sealed from the outside, and the reliability is improved.

According to a seventh aspect of the present invention, a plurality of projections are formed on the lower surface of the rotor, and a plurality of holes for fitting the projections are formed on the main body of the slider. It is preferable that the slider is fixed to the lower surface of the rotor by caulking at least one of the protrusions in a state of being fitted to the protrusion.
As a method of fixing the slider to the lower surface of the rotor, an adhesive or the like may be used. However, if caulking is used, the fixing strength is high, and the adhesive does not adhere to the contact portion or the like. Will be higher.

[0015]

1 to 8 show an example of a variable resistor according to the present invention. This variable resistor includes a case 1, a resistance board 10, a packing 20, a lead terminal 30, a rotor 40, a slider 50, a metal cover 60, and the like.

The case 1 is made of a heat-resistant polyamide such as nylon 46, a thermoplastic resin such as polyphenylene sulfide, polybutylene terephthalate, or a liquid crystal polymer to withstand heat of soldering and to enable stable operation in a high temperature atmosphere. It is made of a resin or a thermosetting resin such as epoxy, diallyl phthalate, and unsaturated polyester. The case 1 is formed in a cylindrical shape that opens in both the upper and lower directions. A circular upper opening 2 is formed in the upper part, and a rectangular lower opening 3 is formed in the lower part. On the inner surface of the case 1 and at an intermediate portion in the vertical direction, an annular spacer portion 4 for ensuring a certain gap for disposing the packing 20 between the rotor 40 and the resistance substrate 10 is provided in a protruding manner. In addition, guide grooves 5 are formed on two opposing outer surfaces of the case 1.

A lower substrate 3 of the case 1 has a resistance substrate 10
Are fitted. The resistance substrate 10 is formed in a square plate shape using, for example, a ceramic material such as alumina or a heat-resistant resin such as polyphenylene sulfide or a liquid crystal polymer. As shown in FIG. 5, a substantially C-shaped resistor 1 made of, for example, a cermet resistor or a carbon resistor is provided on the upper surface of the resistor substrate 10.
1 is formed by a method such as screen printing or transfer. Both ends of the resistor 11 are led out to one side edge of the substrate 10 via the individual electrodes 12 and 13 formed on the substrate 10. A resistor 11 is provided on the upper surface of the substrate 10.
Is formed at the center of the substrate 10, and this current collecting electrode 14 is drawn out to the other side edge of the substrate 10. The fitting depth is defined by contacting the upper surface of the resistance substrate 10 with the lower surface of the spacer portion 4 formed on the inner surface of the case 1 (see FIGS. 3 and 4).

On the upper surface of the resistance substrate 10, a packing 20 having a stable packing effect against heat of soldering and a change in a use temperature and having excellent electrical insulation is formed in an annular shape. Specifically, silicone rubber, fluorine rubber, fluorosilicone rubber, or the like is directly applied and cured so as to surround the upper surface of the resistor substrate 10 and the periphery of the resistor 11.

Three lead terminals 30, 31, and 32 are provided on both side edges of the resistance substrate 10 from which the individual electrodes 12, 13 and the current collecting electrode 14 are drawn out by welding, thermocompression bonding using a heater chip, soldering, or the like. Attached, electrodes 12, 1
3, 14 are electrically connected. In particular, the lead terminal 32 is formed in a forked shape, and the lead terminal 32
Connected at the point. The external connection portions 30a to 32a of the lead terminals 30 to 32 are drawn out from a surface different from the side surface on which the guide groove 5 of the case 1 is provided.
Is bent upward along the outer side surface of the main body. Holes 30b to 33b are formed in the external connection portions to facilitate bending of the external connection portions 30a to 32a. Note that the external connection portions 30a to 32a may be drawn out in the horizontal direction without bending.

The rotor 40 is formed of a heat-resistant resin such as polyphenylene sulfide or liquid crystal polymer into a substantially cylindrical shape, and is rotatably fitted to the upper opening 3 of the case 1. At the center of the upper surface of the rotor 40, a columnar boss 41 is protruded, and a cross-shaped tool engagement groove 42 for engaging a tool such as a driver is formed on the upper surface of the boss 41. An annular groove 43 is formed on the outer periphery of the boss 41, and a stopper 44 is formed at a predetermined position of the annular groove 43. A positioning projection 45 is provided at the center of the lower surface of the rotor 40.
Are provided at the eccentric position on the lower surface.
(See FIG. 6). Further, an annular wall 47 is provided on the lower surface of the rotor 40 so as to surround the projections 45 and 46. The annular wall portion 47 contacts the packing 20 formed on the resistance substrate 10 and
It has a role of forming a closed space 21 (see FIGS. 3 and 4) between the resistor 0 and the resistance substrate 10. In particular, when the rotor 40 is fitted into the upper opening 3 of the case 1, the lower surface of the rotor 40 contacts the upper surface of the spacer 4 of the case 1,
The distance between the rotor 40 and the resistance board 10 becomes constant, and the compression allowance of the slider 50 and the packing 20 described later becomes constant.

The slider 50 is made of a material having excellent spring properties and conductivity, for example, a copper alloy, rustless steel, a noble metal alloy, or the like, and a substantially disk-shaped base (main body) is formed on the upper side thereof. 51 are provided. As shown in FIG. 8, the base portion 51 has holes 5 to be fitted with the protrusions 45 and 46 of the rotor 40.
2 and 53 are formed, and the slider 50 is attached to the rotor 40 while being prevented from rotating. In this embodiment, the holes 52, 53 of the slider 50 are connected to the protrusions 45, 4 of the rotor 40.
After fitting to 6, the protrusions 46 are caulked (for example, heat caulked) to fix the slider 50. Base part 5
1 is provided with a substantially linear first contact arm 54.
And an arc-shaped second contact arm 55 are formed integrally with each other.
Is folded back to the lower surface side. First contact arm 5
A single contact portion 54a that elastically contacts the current collecting electrode 14 of the resistance substrate 10 is formed at the tip of the resistor 4. The distal end of the second contact arm 55 is divided into a comb-like shape, and a plurality of contact portions 55a that are in elastic contact with the resistor 11 of the resistor substrate 10 are formed at the distal end. In FIG. 8, a two-dot chain line indicates a free position of the contact arms 54 and 55, and a solid line indicates a position when the contact arm 54 is pressed against the resistance substrate 10. The slider 50 is punched out from a single metal plate in a state where a plurality of sliders are connected, attached to the rotor 40, and then separated. The assembling method will be described later with reference to FIGS.

The metal cover 60 is made of a copper alloy such as stainless steel or nickel silver which has a rust-preventing effect and a non-solder wettability. The cover 60 has a top plate 61 that is disposed on the upper surface of the case 1 and that controls the lift of the rotor 40.
Is provided at the center thereof, and the cylindrical boss portion 41 of the rotor 40
Is formed in a circular window hole 62 exposing the hole. Window hole 62
Of the rotor 40 is bent downward.
Is inserted into the annular groove 43. A stopper piece 64 protruding long downward is formed at a part of the inner edge 63, and the rotation angle of the rotor 40 is regulated by the stopper piece 64 abutting on the stopper 44 of the annular groove 43. A skirt portion 65 having the same width extends from both sides of the top plate portion 61, and a tongue-like leg portion 66 projects downward from a lower edge of the skirt portion 65. When the cover 60 is put on the case 1, the leg 6
6 is engaged with the guide groove 5 of the case 1 and protrudes downward from the bottom surface of the case 1. Therefore, the front end of the leg 66 is bent inward along the bottom surface of the case 1 so that the cover 60 is bent.
Is attached to the case 1. In this embodiment, the legs 6
In order to make it easier to bend inward, holes 66 are formed in the legs 66.
7 are formed.

Here, a method of manufacturing the above-described slider 50 and a method of assembling the same to the rotor 40 will be described with reference to FIGS. FIG. 9 shows a state in which the continuous body portion 56 and the slider 50 are punched out from a single metal plate in a state of being connected via the connecting portion 57. Pilot hole 56
a is formed at a constant pitch P, and a plurality of sliders 50 are formed at the same interval as the pitch P. The connecting portion 57 extends substantially parallel to the first contact arm 54 before being folded, and is formed on both sides thereof through a cutout portion 58 for forming the arm 54. The pulling part 58 is connected to the connecting part 5.
7 and extend into the continuum 56. The second contact arm 55 extends in a direction substantially orthogonal to the first contact arm 54 and the connecting portion 57.

FIG. 10 shows a state where the first contact arm 54 and the second contact arm 55 are folded back to the lower surface side of the base portion 51 along broken lines L1 and L2 in FIG. At this time, the contact portion 5 of the first contact arm 54
4 a is located substantially at the center of the base portion 51, and the outer peripheral edge of the second contact arm 55 substantially matches the outer peripheral edge of the base portion 51.

FIG. 11 shows broken lines L3 and L4 in FIG.
5 shows a state in which the connecting portion 57 is bent in a step shape. The step H of the connecting portion 57 is formed higher than the height of the annular wall portion 47 of the rotor 40 so as to bypass the annular wall portion 47. When the connecting portion 57 is bent, a weak point (easy separation portion) 57a as shown in FIG. 12 is formed on the outer surface of the bent portion near the base portion 51.
The weak point 57a is formed thin so that it can be easily separated by bending. The weak point 57a may have a notch shape as shown in FIG. 12A or a semi-shear shape as shown in FIG. 12B.

FIG. 13 shows the slider 5 formed as described above.
0 shows a state in which it is attached to the rotor 40 while being connected to the continuum portion 56. At this time, the base portion 51 is disposed on the lower surface of the rotor 40, particularly on the inner portion surrounded by the annular wall portion 47, and the holes 52 and 53 formed in the base 51 are fitted into the protrusions 45 and 46 of the rotor 40. . Then, the slider 50 is fixed to the rotor 40 by caulking the projection 46.

FIG. 14 shows a state where the connecting portion 57 is bent a plurality of times in the thickness direction in order to separate the slider 50 fixed to the rotor 40 from the continuous body portion 56. As described above, since the weak point 57a is formed in the vicinity of the base part 51 of the connecting part 57, the connecting part 57 is easily broken at the weak point 57a. Since the end after the break is located inside the annular wall portion 47 and there is no possibility of protruding below the annular wall portion 47, when it is incorporated into the case 1 together with the resistance substrate 10 as described later, There is no risk that the rear end will come into contact with the resistance substrate 10.

Next, a method of assembling the variable resistor according to the above embodiment will be described. First, the resistor substrate 10 is fitted into the lower opening 3 of the case 1. The lead terminals 30 to 32 are attached to the resistance substrate 10 in advance, and the
0 is applied. Next, the rotor 40 is fitted into the upper opening 2 of the case 1. At this time, since the slider 50 is attached to the lower surface of the rotor 40, the rotor 40 is at a position raised from the case 1.

Next, the metal cover 60 is placed on the case 1 from above.
And insert the leg 66 of the cover 60 through the guide groove 5 on the side surface of the case 1. Then, by bending the leg 66 protruding downward from the lower end surface of the case 1 inward,
The leg 66 is engaged with the lower surface of the case 1. As a result, the top plate 61 of the cover 60 presses the upper surface of the rotor 40 so that the lower surface of the rotor 40 abuts or substantially abuts on the upper surface of the spacer portion 4, and the leg 66 is
The lower surface of the resistance substrate 10 is pressed against the lower surface of the spacer portion 4 while supporting the bottom surface of the spacer substrate 4. Therefore, the components such as the rotor 40 and the resistance board 10 are integrally assembled with the case 1, the distance between the rotor 40 and the resistance board 10 is maintained substantially constant, and the compression allowance of the slider 50 and the packing 20 is maintained. Becomes constant. That is, since the sealing pressure of the packing 20 is kept constant, variations in the sealing performance can be eliminated, and the spring pressure of the slider 50 also becomes constant, so that stable electrical characteristics can be obtained.

The variable resistor assembled in this manner is rotated by rotating the rotor 40 by engaging the tip end of the driver with the tool engagement groove 42 of the rotor 40, so that the center contact 5
4a is kept in contact with the current collecting electrode 14 while the sliding contact portion 55a
Slides on the resistor 11. Therefore, the resistance value between the terminals 30 and 32 or the resistance value between the terminals 31 and 32 can be changed. If the rotor 40 is stopped at a desired position, the rotation of the rotor 40 is regulated by the frictional force of the packing 20, so that the displacement of the contact position between the resistor 11 and the sliding contact portion 55a is suppressed, and the resistance is reduced. The value stabilizes.

The variable resistor according to the present invention is not limited to the above embodiment, but can be variously modified within the scope of the invention. In the above-described embodiment, an example in which the packing 20 is mounted on the resistance substrate 10 has been described. However, the present invention is not limited to this. For example, an O-ring is fitted and held at the lower end of the annular wall 47 of the rotor 40, and the O-ring is connected to the resistance. Substrate 1
It may be sealed by pressing against zero. Also,
It is not always necessary to interpose a sealing member between the annular wall 47 of the rotor 40 and the substrate 10, and the annular wall 47 is provided on the substrate 50 in order to restrict the bending allowance of the contact arms 54 and 55 of the slider 50. It may be in direct contact with the surface of 10. In the above-described embodiment, the lead terminals 30 to 32 are fixed to the resistance substrate 10 to form a surface-mounted variable resistor. However, the lead terminals may be protruded downward to form a variable resistor with lead terminals. Further, the lead terminals may be omitted by extracting the electrodes 12 to 14 to the bottom side of the substrate 10.
Further, the tool engagement groove 42 formed in the rotor 40 is not limited to the cross shape, but may be a minus shape.

[0032]

As is apparent from the above description, claim 1
According to the invention described in (1), the slider is formed integrally from the continuum via the connecting portion, and the connecting portion is cut off with the slider attached to the rotor. In addition, assemblability is improved, and assembling accuracy is also improved. Also,
By folding back at the easy-to-separate portion provided on the connecting portion, the connecting portion can be easily separated, so that the process is simplified and the cost can be reduced. In particular, since the easy-to-separate portion is formed in the vicinity of the main portion of the connecting portion bent in a step shape and at a portion inside the annular wall portion of the rotor,
The uncut portion does not protrude below the annular wall portion, thereby preventing interference with the substrate.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of an example of a variable resistor according to the present invention.

FIG. 2 is a plan view, a front view, and a bottom view of the variable resistor in FIG. 1;

FIG. 3 is a sectional view taken along line XX of FIG. 2;

FIG. 4 is a sectional view taken along line YY of FIG. 2;

FIG. 5 is a plan view of a resistance substrate.

FIG. 6 is a plan view, a ZZ sectional view, and a bottom view of the rotor.

FIG. 7 is a bottom view showing a state where a slider is attached to the rotor.

FIG. 8 is a plan view, a front view, a left side view, and a right side view of the slider.

FIG. 9 is a front view and a side view of a state in which the slider is formed in a connected state with the continuous body portion.

FIGS. 10A and 10B are a front view and a side view in a state where a contact arm of the slider is folded back.

FIGS. 11A and 11B are a front view and a side view of a state where a connecting portion of the slider is bent in a step shape.

FIG. 12 is an enlarged side view of two examples of the easily detachable portion.

FIGS. 13A and 13B are a front view and a side view of a state where a slider is assembled to a rotor.

14A and 14B are a front view and a side view of a state in which a connecting portion of a slider is disconnected.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 10 Resistance board 11 Resistor 14 Current collecting electrode 20 Packing 40 Rotor 47 Annular wall part 50 Slider 51 Base part (body part) 54 First contact arm 55 Second contact arm 56 Continuous body part 57 Connecting part 58 Pulling Part 60 Metal cover

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 5E028 BA03 BB03 CA03 CA12 DA01 HA02 JA04 JB03 5E030 BA03 CA02 CA04 CB06 CC03 CE06 FA02 FB02 5E032 BA03 BB04 CA03 CC03 CC04

Claims (7)

[Claims] 1. A substrate having an upper surface on which a current collecting electrode and an arc-shaped resistor centered on the current collecting electrode are formed; a rotor rotatably disposed on the upper surface of the substrate; A main body to be attached, a first contact arm in contact with the current collecting electrode, a slider integrally formed with a second contact arm in contact with the resistor, and the substrate, the rotor, and the slider, A variable resistor provided with a case for rotatably holding the rotor, wherein an annular wall portion is provided on the lower surface of the rotor and on the outer peripheral side from the slider mounting portion, and the main body of the slider is connected The connecting portion is formed in a state of being connected to the continuous body at regular intervals through the portion, the connecting portion is bent in a step shape so as to bypass the wall portion of the rotor, and a portion near the main body portion of the connecting portion, , Bent at the part inside the annular wall Variable resistor, characterized in that severing easy portion to easily separated is formed by. 2. The method according to claim 1, wherein the first contact arm and the second contact arm extend radially outward from different portions of the main body, and are folded down below the main body. The variable resistor as described. 3. The first contact arm extends substantially linearly outward in the radial direction from the main body, and has a single contact portion formed at the tip thereof. The variable resistor according to claim 2, wherein the variable resistor extends in a substantially arc shape radially outward from the portion, and a plurality of contact portions are formed at a tip portion thereof. 4. The first contact arm and the second contact arm, wherein the connecting portion extends substantially parallel to the first contact arm before being folded, and is formed on both sides thereof through a cutout for forming the arm. 3. After being folded downward with respect to the main body, the main body of the slider is attached to the rotor while being connected to the continuum, and then the connecting portion is cut off. 3
3. The variable resistor according to item 1. 5. The variable resistor according to claim 4, wherein the cut-out portion for forming the first contact arm is longer than the connecting portion and extends into the continuous body. 6. The variable resistor according to claim 1, wherein a wall of said rotor is in contact with an outer peripheral portion of said upper surface of said substrate via an annular packing. 7. A plurality of projections are formed on a lower surface of the rotor, and a plurality of holes for fitting the projections are formed on a main body of the slider. The variable resistor according to any one of claims 1 to 6, wherein the slider is fixed to a lower surface of the rotor by caulking at least one protrusion in a state where the variable resistor is fitted to the rotor.