JPH08213215A - Chip variable resistor - Google Patents

Abstract

PURPOSE: To enable a chip variable resistor to be smoothly and accurately controlled in resistance value by a method wherein an upper plate is connected to a control rotor member engaged with the upside of an insulating board in a freely rotatable manner through the intermediary of a stripe-like connector, a slide terminal is provided to either the upper plate or the rotor member, and both the upper plate and the rotor member are made to rotate following the revolution of a driver tool. CONSTITUTION: A projection 15 is provided to one out of an upper plate 10 and a rotor member 8, and an engaging groove 16 with which the projection 15 is engaged without getting out position is provided to the other, and the upper plate 10 and the rotor member 8 are held so as not to rotate relatively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a variable electronic component having a rotor member rotatably attached to an upper surface of an insulating substrate, such as a chip variable resistor whose resistance value can be arbitrarily adjusted. It is about.

[0002]

2. Description of the Related Art Generally, a chip variable resistor has a rotor member, which is formed in the shape of a bowl having an upward opening made of a metal plate, rotatably attached to an upper surface of an insulating substrate and surrounds the rotor member. A resistance film was applied, and a locking groove hole for a driver tool for rotating the rotor member was formed in the flange of the rotor member, and a sliding terminal in contact with the resistance film was bulged downward. It is configured.

However, as described above, in the structure in which the engaging groove hole for the driver tool and the sliding terminal are formed in the flange of the rotor member by recessing and swelling, the area of the flat surface of the flange in the rotor member becomes narrow. Therefore, when the chip variable resistor is sucked by the vacuum suction collet and mounted on a printed circuit board or the like, a suction error due to the vacuum suction collet is likely to occur.

Further, when the chip variable resistor is sucked by the vacuum suction collet, in order to prevent air from leaking at the position of the locking groove hole with respect to the driver tool, the depth of the locking groove hole is prevented. Has to be approximately the same as the plate thickness of the rotor member, so that the depth of engagement of the driver tool with the locking groove hole cannot be made sufficiently deep, and the rotation operation of the rotor member becomes incomplete. There was also a problem that it was easy to become.

[0005] Therefore, as a prior art, the practical use 3-85
In Japanese Patent No. 604, a top plate that overlaps the top surface of the rotor member is provided on one side edge of the flange of the rotor member.
With the vacuum suction collet, the upper surface plate and the rotor member are integrally connected to each other through a narrow-width connecting portion, and locking groove holes for the driver tool are formed so as to overlap each other in plan view. In order to ensure the suction and the engagement of the driver tool, at the same time, a ring-shaped sliding terminal is fitted to the other side edge of the top plate so as to fit the rotor member from below. By forming a contact portion for the resistance film at a portion of the sliding terminal that is integrally connected through the connecting portion and that is located on the opposite side of the connecting portion with the rotor member with the axis of the sliding terminal interposed therebetween, An invention is disclosed in which the spring elasticity of the moving terminal is increased to reliably prevent contact failure.

[0006]

By the way, when the engaging groove hole for the driver tool is formed in the upper plate and the rotor member as in the prior art, the engaging groove hole in the upper plate and the engaging member in the rotor member are formed. It is difficult to process so that the slot and the slot completely overlap each other in plan view.
Since the driver tool often comes into contact with the inner surface of the locking slot in the top plate, the rotating torque by the driver tool first acts on the top plate.

However, since the rotor member is attached to the insulating substrate and a large frictional resistance is generated between the lower surface of the rotor member and the insulating substrate, the upper plate and the rotor are rotated when the upper plate is rotated. The connecting part with the member elastically deforms, causing the top plate to move horizontally with respect to the rotor member, which prevents the rotor member from accurately following the rotation of the driver tool. Not only can the resistance value adjustment work not be carried out smoothly, but even if the upper surface plate is rotated so that it has a predetermined resistance value, the driver tool is disengaged from the upper surface plate and at the same time the upper surface plate is connected to the rotor member. There is a problem that the phenomenon of reversal occurs due to the elastic restoring force of the part, and the resistance value tends to vary.

Such a problem is caused by, for example, the actual Kaihei 2-81.
As described in Japanese Patent Publication No. 004,
Sliding terminals are formed by bulging the flange of the rotor member downward, and the upper surface plate is integrally connected through a narrow-width connecting portion, and an engaging groove for a driver tool is formed on the upper surface plate. It occurred even when drilling.

According to the present invention, when the upper plate is connected to the rotor member and the engaging groove hole for the driver tool is formed in the upper plate, the upper plate and the rotor member are not displaced relative to each other. So that they can rotate together
An object of the present invention is to provide a variable electronic component capable of smoothly and accurately adjusting the resistance value and the like.

[0010]

To achieve this object, the present invention rotatably attaches a bowl-shaped rotor member having a flange on its upper edge to the upper surface of an insulating substrate, and the rotor member is attached to the upper surface of the insulating substrate. Apply a control film such as a resistance film to surround it,
An upper surface plate having a locking slot for a driver tool is superposed on the upper surface of the rotor member, and the upper surface plate and the rotor member are integrated through a narrow-width connecting portion at one side edge thereof. In the variable electronic component, which is connected to the upper plate or the rotor member and is provided with a sliding terminal for contacting the adjusting film, one of the upper plate and the rotor member has the other side portion. A protrusion extending radially outward or in the vertical direction is formed, and an engaging groove is formed on the other side portion of the other side so that the protrusion can be fitted laterally.

[0011]

According to this structure, the upper plate and the rotor member are engaged with each other so as not to be laterally displaced relative to each other at a portion opposite to the connecting portion with the shaft center therebetween. Since the face plate and the rotor member are held in a relatively non-rotatable state, when the driver tool is engaged with the upper face plate to rotate, the upper face plate and the rotor member simultaneously rotate following the rotation of the upper face plate. Therefore, the sliding terminal follows the rotation of the driver tool and simultaneously slides on the adjusting film.

Further, since the connecting portion between the upper plate and the rotor member is not elastically deformed, even when the upper plate is connected with a ring-shaped sliding terminal adapted to be fitted to the rotor member from below. The phenomenon that the upper plate reverses at the same time when the driver tool is detached from the upper plate does not occur, so that the resistance value and the like can be accurately maintained at the adjusted values.

As described above, according to the present invention, in the case where the upper plate is integrally connected to the rotor member, the upper plate and the rotor member follow the rotation of the driver tool without causing a relative lateral displacement phenomenon. Since it is possible to integrally rotate with the rotor member, the advantage of connecting the upper plate to the rotor member and forming the locking groove hole for the driver tool, that is, the engaging depth of the driver tool and the locking groove hole There is an effect that the resistance value and the like can be adjusted smoothly and accurately without impairing the advantages that the rotor member can be reliably rotated by deepening and the vacuum suction collet can securely suck the rotor member.

[0014]

Embodiments of the present invention will now be described with reference to the drawings. In the figure, reference numeral 1 denotes an insulating substrate made of ceramic or the like, which is formed by forming a through hole 2 at a position located substantially in the center in plan view, and the through hole 2 is surrounded on the upper surface of the substrate 1. A resistance film 3 is formed by coating, and terminal electrode films 4 and 5 are formed on one side surface of the substrate 1 so as to be electrically connected to both ends of the resistance film 3.

Reference numeral 6 denotes a central terminal plate made of a metal plate disposed on the lower surface of the substrate 1. The central terminal plate 6 is integrally provided with a hollow support shaft 7 fitted in the through hole 2. Has been modeled. Reference numeral 8 denotes a rotor member formed of a metal plate in a bowl shape and integrally formed with a flange 8a over the entire circumference of the upper end of the rotor member.
A plus type locking groove hole 9 for inserting and engaging the driver tool A is formed in a, and the rotor member 8 is
After fitting this to the tip of the support shaft 7, the support shaft 7
Swipe the tip of the
) Is attached to the insulating substrate 1 so as to be rotatable. Each of the locking groove holes 9 is formed by engraving two cutting lines in parallel and denting and deforming a portion between the cutting lines downward.

On the upper surface of the rotor member 8, an upper surface plate 10 having locking groove holes 11 for the driver tool A is superposed, and the upper surface plate 10 and the flange 8 of the rotor member 8 are superposed.
a is integrally connected via a narrow-width connecting portion 12 at one side edge thereof, and a connecting portion 12 with the rotor member 8 is sandwiched between the outer peripheral edges of the upper surface plate 10 and the axis thereof.
A ring-shaped sliding terminal 13, which is fitted to the rotor member 8 from below, is integrally connected to the other side portion located on the opposite side to the other side through a narrow-width connecting portion 14, and Moving terminal 1
A contact portion 13a for the resistance film 3 is formed at a portion of the portion 3 located on the opposite side of the connecting portion 14 with respect to the upper surface plate 10 with the axis center therebetween.

The connecting portion 1 with the top plate 10 is sandwiched between the axial centers of the flanges 8a of the rotor member 8.
On the other side located on the side opposite to 2, a narrow width projection 15 is formed to project radially outward, while the projection 15 is laterally displaced at the connecting portion 14 between the top plate 10 and the sliding terminal 13. An engagement groove 16 is formed so that the engagement groove 16 is fixedly fitted. In addition,
The rotor member 8, the top plate 10 and the sliding terminals 13 are
By sheet metal working of a single metal plate, it is formed in a developed state as shown in FIG. 6, and this is formed as shown in FIG. By bending along the crease line formed at the connecting portion between the face plate 10 and the sliding terminal 13, they are formed in a state of overlapping each other.

In the structure described above, the projection 15 has the engagement groove 1.
6, the upper surface plate 10 and the rotor member 8 are relatively non-rotatably held by being fitted in the laterally non-displaceable manner.
Since the connecting portion 12 between the upper surface plate 10 and the rotor member 8 is not elastically deformed, the locking groove hole 11 of the upper surface plate 10 and the locking groove hole 9 of the rotor member 8 completely overlap in a plan view. Even when the driver tool A is in contact with only the inner surface of the locking groove hole 11 in the upper surface plate 10 because of no reason, the upper surface plate 10 and the rotor member 8 follow the rotation of the driver tool A. Will rotate at the same time.

Therefore, when adjusting the resistance value, the top plate 10
Does not laterally shift with respect to the rotor member 8 and the upper surface plate 10 and the sliding terminal 13 do not return and deform due to elastic restoring force after the resistance value is adjusted, so that the resistance value can be adjusted smoothly and accurately. You can In the above embodiment, the rotor member 8
Although the projection 15 is formed on the upper surface of the rotor member 8, as shown in FIG. 8, the narrow-width connecting portion 14 between the upper plate 10 and the sliding terminal 13 is also used as the projection 15, and the flange 8a of the rotor member 8 is It is also possible to form an engaging groove 16 that fits into the connecting portion 14.

Further, as shown in FIG. 9, the locking groove hole 11 of the rotor member 8 is fitted into the bottom of the locking groove hole 11 located near the connecting portion 14 of the upper plate 10 with respect to the sliding terminal 13. It is also possible to bend and form the downward projection 15 that is used as the engaging groove hole 9 of the rotor member 8 also as the engaging groove 16. In each of the above-mentioned embodiments, the ring-shaped sliding terminal to be fitted to the rotor member is connected to the upper surface plate, but the present invention is the case where the sliding terminal is bulged on the flange of the rotor member. Can also be applied to.

The present invention can also be applied to other variable electronic components such as chip variable capacitors.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a perspective view of an essential part of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view taken along the line IV-IV of FIG. 1.

5 is a side view taken along line VV of FIG. 1. FIG.

FIG. 6 is a plan view of the rotor member, the top plate, and the sliding terminal according to the first embodiment in a developed state.

FIG. 7 is a diagram showing a manufacturing process of the rotor member according to the first embodiment.

FIG. 8 is a diagram showing another embodiment.

FIG. 9 is a diagram showing still another embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Insulating substrate 3 Resistive film 7 Support shaft 8 Rotor member 8a Flange 9 Rotor member locking groove hole 10 Upper surface plate 11 Upper surface plate locking groove hole 12 Connecting portion between upper surface plate and rotor member 13 Sliding terminal 15 Protrusion 16 Engagement groove A driver tool

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[Procedure amendment]

[Submission date] November 17, 1995

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Chip variable resistor

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a chip variable resistor (semi-fixed resistor) whose resistance value can be arbitrarily adjusted.
It is about.

[0002]

2. Description of the Related Art A chip variable resistor is provided with an insulating substrate and a rotor member rotatably attached to the upper surface of the insulating substrate, and a horseshoe shape extending around the rotation center of the rotor member on the upper surface of the insulating substrate. On the other hand, the rotor member is provided with a sliding terminal that contacts the resistance film, and the rotor member is rotated by a driver tool to change the position where the sliding terminal contacts the resistance film. It is well known that the resistance value is adjusted accordingly.

The shape of the rotor member is, for example, Japanese Utility Model Laid-Open No. Sho 62-118403 or Japanese Utility Model Laid-Open No. 3-214.
As described in Japanese Patent Publication No. 708, the rotor member is separately configured into two members, an upper member and a lower member, which are separately manufactured. A locking slot into which a driver tool is fitted is formed in the upper member, and a metal member is formed in the lower member. It is roughly classified into a plate-shaped one in which sliding terminals are formed on the plate and the both are integrally caulked to an insulating substrate, and a rotor member is integrally formed of a metal plate.

In this case, when the rotor member is separated into upper and lower members as in the former case, it is necessary to hold the upper and lower members so as to rotate integrally. While a downward projection is provided on the outer peripheral edge of the member, a groove into which the projection is fitted from above is cut out at a portion of the lower member on the opposite side of the sliding terminal with the shaft center interposed therebetween.

On the other hand, as in the latter case in which the entire rotor member is integrally formed of a metal plate, the applicant of the present application discloses that the rotor member is disclosed in Japanese Utility Model Publication No. 3-85604 and Japanese Utility Model Publication No. 4-63603. The bowl-shaped member and the top plate are formed as a three-layer structure of a bowl-shaped member attached to the insulating substrate, an upper surface plate overlapping the upper surface of the bowl-shaped member, and a lower surface plate fitted to the bowl-shaped member from below. The upper surface plate and the lower surface plate are connected to each other via a narrow-width first connecting portion, and the upper surface plate and the lower surface plate are connected to each other via a second connecting portion located on the side opposite to the first connecting portion with the axis interposed therebetween. And a bowl-shaped member, a locking groove hole into which a driver tool is fitted is formed so as to overlap in a plan view, and a sliding terminal is formed on the lower plate.

By the way, when the chip variable resistor is assembled or the assembled chip variable resistor is mounted on a printed circuit board or the like, the upper surface of the rotor member is sucked by the vacuum suction collet and transferred in that state. Therefore, the chip variable resistor is required to have certainty of suction by the vacuum suction collet. Further, it is required that the resistance value is adjusted reliably and easily, and that the resistance value does not change after the adjustment. Further, it is necessary to reduce processing cost and assembly cost as much as possible.

With respect to these points, Japanese Utility Model Publication No. 62-118
In the case where the rotor member is separated into the upper and lower two members as in Japanese Patent No. 403 and Japanese Utility Model Laid-Open No. 3-214708, the engaging groove is penetrated downward when the engaging groove hole for the driver tool is formed in the upper member. Since it can be formed in a state where it is not formed, it has an advantage that it can improve the reliability of suction by the vacuum suction collet, but on the other hand, it is to manufacture the upper and lower members separately and crimp them to the insulating substrate in the aligned state. Therefore, there is a problem in that the labor of manufacturing and assembling increases.

Further, in order to rotate the upper member and the lower member together, the protrusion of the upper member is merely fitted into the engaging groove of the lower member from above, and therefore the protrusion and the engaging groove are caused by a processing error or the like. If the engagement with is small, there is a problem that the engagement is released. Furthermore, since the protrusion and the engaging groove are provided only at one place located on the opposite side of the sliding terminal, the function of surely preventing the relative displacement between the upper member and the lower member is still unsatisfactory. Was enough.

On the other hand, as in the prior invention of the applicant, 1
When the rotor member is formed into a three-layered structure by folding one metal plate over another, the entire metal plate is used to reduce the processing and manufacturing costs, but the vacuum suction collet is used for the suction operation of the driver tool. Since air leakage at the location of the stop groove can be reduced, mistakes in assembly and mounting on the printed circuit board can be reduced, and the spring elastic force that presses the sliding terminal against the resistance film can be dramatically increased. The advantage is that it is possible to prevent the rotor member from easily rotating after the poor contact or adjustment of the sliding terminal to the resistance film.

[0010]

By the way, when the rotor member has a three-layer structure as in Japanese Utility Model Laid-Open No. 3-85604 and Japanese Utility Model Laid-Open No. 4-63603, one metal plate is used for manufacturing the rotor member. After processing the bowl-shaped member, the upper surface plate and the lower surface plate in the unfolded state, the two connecting parts are bent. In that case, in order to facilitate the bending process, the connecting parts should be formed. It is desirable to set as narrow as possible.

On the other hand, in manufacturing the rotor member,
It is difficult to machine the locking slot of the upper plate and the locking slot of the bowl-shaped member so as to completely overlap each other in a plan view. May be shifted in a plan view. For this reason, when the rotor member is rotated by the driver tool, the driver tool may be in a state of being unidirectionally contacted with the upper plate.

However, since the bowl-shaped member is attached to the insulating substrate and a large frictional resistance exists between the bowl-shaped member and the insulating substrate, the first connecting portion is thin and easily deformed. When rotating with a driver tool, a phenomenon occurs in which the top plate slightly shifts with respect to the bowl-shaped member.
Therefore, there is a problem that the bowl-shaped member does not accurately follow the rotation of the driver tool and does not rotate, and the resistance value easily varies.

The present invention aims to solve this problem.

[0014]

In order to achieve this object, the invention of claim 1 is characterized in that "an insulating substrate and a rotor member made of a metal plate rotatably attached to an upper surface of the insulating substrate are provided. On the upper surface of the substrate, a resistance film is provided so as to surround the center of rotation of the rotor member, while the rotor member is provided with an upward-opening bowl-shaped member having an outward flange at the upper end, and on the upper surface of the bowl-shaped member. As a three-layer structure of an overlapping upper surface plate and a ring-shaped lower surface plate that is fitted to the bowl-shaped member from below, the bowl-shaped member and the upper surface plate are connected to each other through a narrow-width first connecting portion. , The upper plate and the lower plate are connected to each other through a narrow second connecting portion located on the opposite side of the first connecting portion with the axis interposed therebetween, thereby forming a bowl-shaped member, an upper plate and a lower plate. And a continuous shape, and a driver tool is fitted on the top plate and the bowl-shaped member. In the chip variable resistor, the locking groove hole is formed so as to overlap with each other in plan view, and further, the lower terminal plate is formed with a sliding terminal that comes into contact with the resistance film of the insulating substrate. While the engaging groove is formed in the portion, a protrusion that fits in the engaging groove in a laterally displaceable manner is formed in a portion of the flange of the bowl-shaped member that is located on the opposite side of the first connecting portion with the shaft center interposed therebetween. The configuration is "Yes".

Further, in the invention of claim 2, in the same premise structure as in claim 1, "a portion of the flange of the bowl-shaped member located on the opposite side of the first connecting portion with the axial center sandwiched therebetween. , A pair of protrusions are formed so as to sandwich the second connecting portion from both sides along the circumferential direction so that the second connecting portion cannot be displaced.
Was configured.

[0016]

According to this structure, the projection formed on the bowl-shaped member is fitted into the engaging groove of the second connecting portion or the second connecting portion itself so that the bowl-shaped member cannot be displaced. The upper plate and the upper plate are in the same state as being integrally connected at the second connecting portion. That is, the bowl-shaped member and the top plate are in the same state as being integrally fixed at two locations, the first connecting portion and the second connecting portion with the axis centered therebetween.

Therefore, when the driver tool rotates the rotor member, the upper plate and the bowl-shaped member rotate with respect to the inner surface of the locking slot of the upper plate even if the driver tool is in one-side contact. As a result, the resistance value can be precisely adjusted to a state in which there is no variation. Further, since the projection provided on the bowl-shaped member is sandwiched between the upper surface plate and the lower surface plate, even if the projection may rattle in the vertical direction, the projection and the engaging groove or the projection and the second connection The engaged state with the portion is surely maintained, and therefore, the above-mentioned actual opening 62-118403.
The certainty of precisely rotating the rotor member following the driver tool as compared with the one in which the protrusion and the engaging groove are simply fitted vertically as in Japanese Patent No. 2 and Japanese Utility Model Laid-Open No. 3-214708. You can guarantee it.

Further, a material metal plate is processed into a sheet metal to form an upper plate, a bowl-shaped member and a lower plate in a developed state, and the first connecting portion is bent and then the second connecting portion is bent. By bending in such a procedure, the protrusion is automatically formed in a state of being fitted in the engaging groove or in a state of sandwiching the second connecting portion by a pair of protrusions, so that the processability of the rotor member is impaired. It will not be done.

As described above, according to the present invention, the advantage of the rotor member having the three-layer structure of the upper surface plate, the bowl-shaped member and the lower surface plate, that is, the engagement depth between the driver tool and the locking slot is In addition to ensuring the rotating operation of the rotor member by making it deeper, the suction by the vacuum suction collet is also ensured, and the resistance value is precisely maintained without sacrificing the advantage that it is easy to manufacture. Has adjustable effect.

[0020]

Embodiments of the present invention will now be described with reference to the drawings. 1 to 7 show a first embodiment embodying claim 1, in which FIG. 1 is a plan view, FIG. 2 is a perspective view of essential parts, and FIG. 3 is a sectional view taken along line III-III of FIG. 4 is a IV-IV view of FIG. 1,
FIG. 5 is a V-V view of FIG.

In these figures, reference numeral 1 indicates an insulating substrate made of ceramic or the like, which is formed by forming a through hole 2 in a portion located substantially in the center in plan view. A resistance film 3 is formed on the upper surface of the substrate 1 so as to surround the through hole 2. Further, on one side surface of the substrate 1, terminal electrode films 4 and 5 which are electrically connected to both ends of the resistance film 3 are formed. Reference numeral 6 indicates a central terminal plate made of a metal plate, which is disposed on the lower surface of the substrate 1. A hollow support shaft 7 that fits into the through hole 2 is integrally formed on the center terminal plate 6.

On the upper surface of the insulating substrate 1, a rotor member 8 formed by processing a metal plate into a metal plate is rotatably attached. The rotor member 8 has a bowl-shaped member 9 having an upward opening formed with a flange 9a extending over the entire circumference at the upper end.
And an upper surface plate 11 superposed on the upper surface of the bowl-shaped member 9,
The bowl-shaped member 9 is fitted with a ring-shaped lower surface plate 14 from below.

The flange 9a of the bowl-shaped member 9 has a plus-shaped locking slot 1 for inserting and engaging the driver tool A therein.
0 is recessed. Further, after the bowl-shaped member 9 is fitted on the tip of the support shaft 7, the tip of the support shaft 7 is caulked and expanded (this caulked expansion portion is indicated by reference numeral 7a) so that the rotor member 8 is attached to the insulating substrate 1. It is rotatably attached to. Each locking groove hole 10 is formed by engraving two cutting lines in parallel and denting and deforming between these cutting lines downward.

A locking slot 12 for the driver tool A is formed in the upper plate 11. Further, the upper surface plate 11 and the flange 9a of the bowl-shaped member 9 are integrally connected to each other via a narrow-width first connecting portion 13 at one side edge thereof. On the other hand, the upper surface plate 11 and the lower surface plate 14 have a second connecting portion 15 located on the opposite side of the first connecting portion 13 with the axis therebetween.
Are connected together via. Sliding terminals 14 a that come into contact with the resistance film 3 are formed in a portion of the lower surface plate 14 that is located on the opposite side of the second connecting portion 15 with the shaft center interposed therebetween.

On the flange 9a of the bowl-shaped member 9, a narrow width-shaped projection 16 is formed at a portion of the flange 9a located on the opposite side of the first connecting portion 13 with the axial center interposed therebetween. The second connecting portion 15 is provided with an engaging groove 17 into which the protrusion 16 is fitted sideways and cannot be displaced. Figure 6
As shown in FIG. 7, by forming a metal plate from a single metal plate to form the bowl-shaped member 9, the upper surface plate 11 and the lower surface plate 14 in a developed state, first, as shown in FIG. The bowl-shaped member 9 and the upper surface plate 11 are overlapped by bending the second connecting portion 13 at a fold, and then,
By fitting the lower surface plate 14 to the bowl-shaped member 9 by bending the second connecting portion 15 at the fold line,
The rotor member 8 is manufactured.

In the above structure, the projection 16 is formed in the engaging groove 1.
Since it is fitted laterally with respect to 7,
Since the bowl-shaped member 9 and the top plate 11 are in the same state as they are fixed on both sides of the shaft center, the locking slot 1 of the top plate 11
2 and the engaging groove hole 10 of the bowl-shaped member 9 do not completely overlap each other in a plan view, the driver tool A is in a state of one-sided contact with the inner surface of the engaging groove hole 12 in the top plate 11. Even so, the upper surface plate 11 and the bowl-shaped member 9 completely follow the rotation of the driver tool A and rotate.

Therefore, the resistance value can be precisely adjusted without variation. Further, since the projection 16 is sandwiched between the upper surface plate 11 and the lower surface plate 14 from above and below, even if the projection 16 can be displaced slightly in the vertical direction due to a processing error or the like, the projection 16 will not move from the engagement groove 17. It never escapes, so the ability to precisely adjust resistance is compromised. Furthermore, both connecting parts 13, 15
Since the protrusion 16 is automatically fitted into the engaging groove 17 by bending the portion at the center, the easiness of processing the rotor member 8 is not impaired.

FIG. 8 shows a second embodiment of claim 2.
This is an example. In other words, in this embodiment, the pair of second connecting portions 15 are sandwiched from both sides along the circumferential direction in the portion of the bowl-shaped member 9 located on the opposite side of the first connecting portion 13 with the axis center therebetween. The projection 16 is provided. Also in this case, both protrusions 16 are in contact with the second connecting portion 15.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment.

FIG. 2 is a perspective view of an essential part of FIG.

FIG. 3 is a sectional view taken along line III-III in FIG.

FIG. 4 is a side view taken along the line IV-IV of FIG. 1.

5 is a side view taken along line VV of FIG. 1. FIG.

FIG. 6 is a plan view of the rotor member according to the first embodiment in a developed state.

FIG. 7 is a diagram showing a manufacturing process of the rotor member according to the first embodiment.

FIG. 8 is a diagram showing a second embodiment.

[Explanation of Codes] 1 Insulating substrate 3 Resistive film 7 Support shaft 8 Rotor member 9 Bowl-shaped member 9a Flange of bowl-shaped member 10 Locking groove hole of bowl-shaped member 11 Top plate 12 Locking hole of top plate 13 Top plate First connecting portion 14 that connects the rotor member and the rotor member 15 sliding terminal 15 second connecting portion that connects the upper surface plate and the lower surface plate 16 protrusion 17 engaging groove A driver tool

[Procedure 3]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 3]

[Figure 4]

[Figure 5]

[Figure 6]

[Figure 8]

[Figure 7]

Claims (1)

[Claims] 1. A bowl-shaped rotor member having a flange formed on an upper edge thereof is rotatably attached to an upper surface of an insulating substrate, and
An adjustment film such as a resistance film is applied so as to surround the rotor member, and an upper surface plate having a locking groove hole for a driver tool is superposed on the upper surface of the rotor member. In a variable electronic component in which a sliding terminal that is in contact with the adjustment film is provided on the upper surface plate or the rotor member by integrally connecting A protrusion that extends radially outward or vertically is provided on the other side of one of the top plate and the rotor member, and the protrusion is fitted on the other side of the other side so as not to laterally shift. A variable electronic component characterized in that each groove is formed.