JP3525470B2 - Variable electronic components - Google Patents

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 mainly used for circuit adjustment of electronic equipment.

[0002]

2. Description of the Related Art A conventional variable electronic component is shown in FIG.
This will be described with reference to FIGS. 14 is a side sectional view, FIG. 15 (a) is a top view showing a state in which a middle terminal and an outer terminal are respectively connected to a substrate, which is a main part, and is integrated with a case by insert molding, and FIG. 15 (b) is the same front view. It is a figure. According to the figure, 11 is a substrate made of an insulating material.
A horseshoe-shaped resistor film 12 is formed on one main surface. External terminals 14 are provided on both ends of the resistor film 12, respectively.
Are connected by solder 16, and the resistor film 12
An electrode 13 is formed in the center so as to be surrounded by, and the resistor film 1 is formed while the electrode 13 is being drawn outward.
2a is overcoated and the electrode 13
The middle terminal 15 is connected to the outer end of the with solder 16.
In this state, the substrate 11 is integrated with the case 17 made of a synthetic resin material by insert molding. The upper surface of the case 17 and one main surface of the substrate 11 are formed on the same surface, a step for fitting is formed around the upper surface of the case 17, and insert molding is performed at the center of the lower surface of the case 17. A hole for pressing the substrate at the time is formed.

Reference numeral 18 is a cover made of a synthetic resin material, in which a through hole 18a is formed in one side, a concave portion 18c is formed inside thereof concentrically with the through hole 18a, and an opening 18 is formed in the other side.
b is formed, and a fitting step is formed around the opening 18b. Reference numeral 19 is a ring-shaped ring body made of rubber, and 20 is a shaft made of a synthetic resin material. An operation groove 20a is formed at one end, a flange portion 20b is formed near the center, and a spring property is provided at the other end. And a slider 21 made of a conductive material is attached.

Here, after inserting the ring body 19 from the opening 18b side of the cover 18 and fitting the ring body 19 into the recess 18c, the shaft 20 having the slider 21 attached thereto is inserted into the opening of the cover 18. The cover 1 is inserted from the side of the portion 18b.
One end of the shaft 20 penetrates the through hole 18a of No. 8 and the flange portion 20b of the shaft 20 is in contact with the ring body 19.

Next, the case 17 integrally formed with the substrate 11 to which the outer terminal 14 and the middle terminal 15 are connected so as to seal the opening 18b of the cover 18.
The case 17 and the cover 18 are fitted and assembled with an adhesive or the like while fitting the fitting step of 1 to the fitting step of the cover 18.

At this time, the slider 21 attached to the shaft 20 is in pressure contact with the resistor film 12 and the electrode 13 formed on one main surface of the substrate 11, respectively.

Next, the operation of the variable resistor will be described. In the above embodiment, a jig such as a driver is fitted into the operating groove 20a of the shaft 20 and the shaft 20 is rotated. A desired resistance value can be obtained by simultaneously sliding the slider 21 rotating with the shaft 20 on the resistor film 12 and the electrode 13. Also,
The resistance film 12, the electrode 13, and the slider 21 are dustproof by the substrate 11, the case 17, the cover 18, and the shaft 20.

[0008]

However, in the above-described conventional configuration, when the substrate 11 to which the outer terminal 14 and the middle terminal 15 are soldered is insert-molded, the outer terminal 14 and the middle terminal are formed. The outer terminal 14 and the middle terminal 1 due to the mutual misalignment of 15 and the substrate 11.
5. Deformation and crushing failure of No. 5, cracks and cracks when the substrate 11 is made of ceramic or the like, and breakage of the molding die are likely to occur, and the substrate 11 has a film shape of low rigidity such as polyimide. If it is used, it is difficult to mold it in a stable position, and since the case 17 and the cover 18 are assembled by bonding with an adhesive, equipment and processes for applying and drying the adhesive are required. Therefore, there is a problem that it is difficult to improve productivity.

The present invention solves the above-mentioned conventional problems, and a film-shaped substrate such as polyimide can be easily used as a substrate, and there are few cracks and cracks in the substrate and breakage of the molding die, and easy-to-mold components. It is an object of the present invention to provide a variable electronic component that can be used and that does not require the use of an adhesive for fixing the combination of cases and the like, and is easy to assemble and economical.

[0010]

In order to solve the above problems, the present invention provides two cases, a central terminal plate fixed to one case, and a substrate held between the two cases. The sliding member is arranged so as to slide with respect to the substrate, and the engaging portion formed by extending from the central terminal plate is provided at the center of the holding convex portion formed on the other case. Retaining claws that engage with the groove-shaped engaging portions and extend from the central terminal plate and face each other in pairs are crimped so as to sandwich the retaining projections of the other case from both sides. A case in which the two cases are fixed, two cases, a central terminal plate fixed to one case, a substrate held between the two cases, and a slide with respect to this substrate Equipped with a sliding body arranged so as to extend from the central terminal plate A hooking portion is formed so as to project near the opposing tips of the pair of holding claws, and at the same time when the two cases are combined, the hooking portion of the holding claw is formed on the holding projection formed on the other case. Snap locking, further, the engaging portion formed by extending from the central terminal plate,
The two cases are fixed by engaging with a groove-shaped engaging portion in the center of the holding convex portion of the other case.

[0011]

Therefore, according to the present invention, since the substrate is held between the upper case and the lower case, it is possible to easily use a film-shaped substrate such as polyimide as the substrate. Since the substrate does not have to be insert-molded, it is possible to avoid the occurrence of cracks and cracks and eccentricity of the substrate due to molding, and it is possible to reduce the occurrence of short shots of the lower case, etc. The upper case and the lower case are temporarily fixed by engaging the engaging portion of the central terminal plate with the groove-like engaging portion in the center of the holding convex portion formed on one of the cases. Further, the holding claws of the central terminal plate are crimped so as to sandwich the holding convex portions of the case from both sides, so that the meat of the holding convex portions of the case is , The two cases are more firmly fixed, and the hooks of the holding claws of the central terminal plate are snap-locked to the holding projections formed on any of the cases. Or the engaging portion of the central terminal plate engages with the groove-shaped engaging portion at the center of the holding convex portion of the case, so that the two cases are fixed and easy to assemble and dustproof. It is possible to provide a variable-type electronic component that is economical in structure.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A variable electronic component of the present invention will be described with reference to FIGS. FIG. 1 is a top view showing an embodiment in which the variable electronic component of the present invention is adopted in a variable resistor, and FIG. 2 is A- of FIG.
FIG. 3 is a cross-sectional view obtained by synthesizing A ', BB' cross sections by XX '.
Is a front view. FIG. 4 is a top view of the substrate, which is the main part. FIG. 5A is a top view of the operation body, which is the main part,
6B is a side view of the same, and FIG. 5C is a bottom view of the same.
FIG. 6A is a top view of the sliding body, which is the main part, and FIG. 6B is a side view of the same. FIG. 7 is a top view showing a state in which the central terminal plate, which is the main part, is connected to the connecting box (a hoop-shaped central terminal plate), and FIG. 8 is a sectional view taken along line CC 'of FIG. 9 is a top view showing a state in which the hoop-shaped central terminal plate and the upper case and the lower case are integrally molded, FIG. 10 is a sectional view taken along the line DD ′ of FIG. 9, and FIG. 11 is a bottom view of FIG. 12 is a cross-sectional view showing a state in which the operating body and the sliding body of FIG. 2 are assembled in FIG. FIG. 13 is a side view showing a state before the upper case and the lower case of FIG. 2 are assembled.

According to FIGS. 1 to 13, reference numeral 1 denotes a central terminal plate made of a conductive material and having a central hole 1a, and a diverging engagement portion 1 in the middle of a tip portion 1e extending from the center.
f is formed, and holding claws 1g extending from two positions on both sides in the same direction as the extension direction of the tip end portion 1e and extending in the direction of the other side 1c are formed to face each other in pairs. Engagement portions 1i are formed so as to project near the opposite ends of the holding claws 1g, and connection holes 1h are formed near the tips of the leading end portions 1e and the holding claws 1g, respectively. In the opposite direction of 1e, stopper reinforcement 1
d is bent in the direction of the one side 1b so as to be folded back, and the tip portion 1e is formed continuously with the connecting rod 10 at the initial stage of assembly. Pilot holes 10a are formed in the connecting rod 10 at a constant pitch.

Reference numeral 2 denotes a lead-out terminal made of an elastic metal material or the like, which is formed at two positions on the left and right sides of the central terminal plate 1 in the direction of the stopper reinforcing portion 1d at an arbitrary interval from the central terminal plate 1. L-bent portions 2e are formed on each outer side of one end portion 2a close to the terminal plate 1 by being bent at a substantially right angle in the direction of the one side 2b, and stoppers of the central terminal plate 1 are formed on the inner side of each. A shear cut portion 2d is formed by cutting the stopper reinforcing portion 1d from the state in which the stopper reinforcing portion 1d was connected to the lead-out terminal 2 before the reinforcing portion 1d is bent and formed, and a connecting hole 2f is formed in the middle of the one end portion 2a. An intermediate hole 2i is formed in the following intermediate portion 2g, and a contact portion 2h is formed by projecting and bending in an S shape in the direction of the other side 2c, and the following other end portion 2j is in the direction of the other side 2c. To Is a form bent to the shape or the like, and at the time of assembling the near outer side of the intermediate hole 2i and the other end portion 2j is connected to the lead terminal connecting portions 10b of the connection ledges 10.

Next, the central terminal plate 1 and the lead-out terminal 2 formed in the hoop shape, and the PPS, PPA, LC
The upper case 3 and the lower case 4 made of an insulating material such as P and PBT are integrally formed by insert molding. The upper case 3 is formed with an inner peripheral wall 3a having a stepped portion 3g having an inner peripheral surface concentric with the central hole 1a on one side 1b of the central terminal plate 1, and a stopper for the central terminal plate 1 is formed. Around the reinforcing portion 1d, an inner convex portion 3b that projects inward of the inner peripheral wall 3a on the side of the central terminal plate 1 and regulates the rotational position of the operating body 5 is formed, and an opening portion 3c is formed on the other side 1c. The substrate pressing surface 3d that partially projects around the tip of the opening 3c is formed, and the contact space 3f is formed near the center of the one end 2a of the other side 2c of the lead terminal 2. An outer wall on the other side 1c side of the central terminal plate 1 is formed with a trapezoidal fitting wall 3e inclined at a constant angle.

In the lower case 4, the other end portion 2j of the lead-out terminal 2 is inserted, and a concave introduction wall 4e is formed on the other side 2c of the lead-out terminal 2 at a certain angle. Concave portions 4f having a depth corresponding to the existing thickness of the lead-out terminals 2 are formed on the upper surfaces respectively closest to the intermediate portions 2g, and a substrate receiving surface 4a is formed on the concave lower end surface, and the substrate receiving surface 4a is formed on the substrate receiving surface 4a. The other side 2 of the other end 2j of the terminal 2
c is formed on the exposed bottom surface so that one side of the other end 2j of the lead-out terminal 2 is exposed, and the intermediate portion 2 of the lead-out terminal 2 is formed.
A holding convex portion 4b is formed on a side surface opposite to the side where g is located, and is a groove shape having a chamfer in the center vertical direction of the holding convex portion 4b so that it can be easily introduced, and spreads from the middle toward the bottom. Engaging portion 4c is formed in the shape of
A bottom surface step 4d is formed near the bottom surface of b.

The operating body 5 is made of a metal material such as aluminum, copper or brass, or a polymer material such as PPS, PBT, PPA, LCP, etc., and has a large diameter portion on one end of which an operating groove 5b is formed. 5a, a small diameter portion 5f inserted through the central hole 1a of the central terminal board 1 at the other end, and a central portion 5c formed in a step shape near the center. , Projecting in the outer peripheral direction of the diameter from a part of the central portion 5c,
There is an outer convex portion 5d whose radial dimension is less than or equal to the radial dimension of the large diameter portion 5a, and the lower surface of the operation groove 5b corresponding to the outer convex portion 5d is inclined so that the position can be seen. The deep groove portion 5e is formed in a strip shape, a step shape, a flat bottom shape, or the like.

By forming the deep groove portion 5e, a sudden change in the wall thickness in the vicinity of the outer convex portion 5d and the operation groove 5b is prevented and the working is facilitated. The central terminal board 1
From the side of the inner peripheral wall 3a of the upper case 3 formed integrally with the upper case 3, the small diameter portion of the operation body 5 is located at a position where the outer convex portion 5d of the operation body 5 does not collide with the inner convex portion 3b of the upper case 3. 5f
Is inserted into the central hole 1a of the central terminal plate 1 so that the end face of the central portion 5c on the side of the small diameter portion 5f of the operating body 5 and the one side 1b of the central terminal plate 1 come into contact with each other, and Body 5
The central portion 5c and the large-diameter portion 5a of the operating body 5 are arranged so that the surface on the central portion 5c side of the large-diameter portion 5a and the stepped portion 3g of the inner peripheral wall 3a of the upper case 3 face each other. It is arranged in the peripheral wall 3a. At this time, the large diameter portion 5a and the inner peripheral wall 3a
The gap between and can be inserted and is formed to be as small as possible.

Reference numeral 6 is a sliding member made of a conductive material having a spring property, and an engaging hole 6 partially formed in a non-circular shape at the center.
a is formed, one surface side 6b is flat, and the other surface side 6c is formed with a contact 6d. Contact 6d of the sliding body 6
The engaging hole 6a of the sliding body 6 and the small diameter portion 5f of the operating body 5 are engaged so that the sliding body 6 is located on the deep groove portion 5e side of the operating body 5, and the sliding body 6 has a small diameter of the operating body 5. The sliding body 6 is inserted into the portion 5f, the end of the small diameter portion 5f is swaged to form a swaging portion 5g, and one surface side 6b of the sliding body 6 is in contact with the other side 1c of the central terminal plate 1 while 6 is attached so as to rotate together with the operating body 5. In addition, the contact portion 2h of the lead-out terminal 2 bent in the S shape is shown in FIG.
As shown in FIG. 4, the contact space 3f of the upper case 3 is folded back to the contact space 3f (from the outer side of the upper case 3 to the inner arrow direction), and the tip 1e of the central terminal plate 1 is cut from the connection board 10 to form the central terminal. It is bent in the direction of the other side 1c of the plate 1.

Reference numeral 7 denotes a substrate made of a film-shaped insulating material such as polyimide or polyetherimide, or a plate-shaped insulating material such as glass epoxy or bake, or ceramics, and has a central hole 7b and a cutout 7c for positioning such as printing and assembling. A horseshoe-shaped resistor film 8 is formed on the one main surface 7a around the center hole 7b, and the end 8a of the resistor film 8 and the one main surface 7a of the substrate 7 are formed. An electrode 9 may be formed between and and or on the upper surface of the end portion 8a.

Here, the substrate 7 is inserted from the introduction wall 4e side of the lower case 4 so that the one main surface 7a side of the substrate 7 faces upward, and is arranged on the substrate receiving surface 4a of the lower case 4. . At this time, in order to temporarily fix the substrate 7, the outer edge of the substrate 7 and the lower end portion of the introduction wall 4e of the lower case 4 are press-fitted, or part of the introduction wall 4e or one of the substrate receiving surfaces 4a. The part or the like may be crushed to the substrate 7 side, or may be simply temporarily fixed with an adhesive or the like.

Next, the bent contact portion 2h of the lead-out terminal 2 is located in the recess 4f of the lower case 4, and the fitting wall 3e of the upper case 3 is fitted in the introducing wall 4e of the lower case 4. The intermediate portion 2g of the lead-out terminal 2 so that
By bending the vicinity of the upper case 3 and the lower case 4, respectively, the central terminal plate 1, the operating body 5, the sliding body 6
The upper case 3 integrated with the upper case 3 is combined with the lower case 4 on which the substrate 7 is arranged, and at the same time, the hooking portion 1i of the holding claw 1g of the central terminal plate 1 integrated with the upper case 3 has the lower case 4 Of the central terminal plate 1 is engaged with the engaging portion 4c of the lower case 4, and the tip 1e of the central terminal plate 1 is attached to the lower convex portion 4b. The case 4 is bent to the bottom step 4d side, and further, the two holding claws 1g of the central terminal plate 1 are bent and crimped so as to sandwich the holding convex portion 4b of the lower case 4 from both sides. Is formed, and the upper case 3 and the lower case 4 are fixed to each other. At this time, the flesh of the holding convex portion 4b of the lower case 4 is brought closer to the engaging portion 1f side of the central terminal plate 1 and is more firmly fixed. Before and after the combination, grease, a surface-active material, an adhesive or the like may be arranged between the upper case 3 and the lower case 4.

Here, the substrate pressing surface 3d of the upper case 3
And the main surface 7a side of the substrate 7 are in contact with each other, and the contact 6d of the sliding body 6 is in pressure contact with the resistor film 8 of the substrate 7,
The contact portion 2h of the lead-out terminal 2 is in pressure contact with the end 8a of the resistor film 8 of the substrate 7 or the electrode 9, and the vicinity of the end 8a of the resistor film 8 of the substrate 7 is the lower case 4
It is in a state of being received by the other end portion 2j of the lead-out terminal 2 exposed from the substrate receiving surface 4a. Next, the lead-out terminal 2 is connected to the lead-out terminal connecting portion 10b of the connecting board 10.
Has been disconnected from.

Next, the operation of the variable resistor of the above embodiment will be described. First, a jig such as a driver is attached to the operation body 5
By rotating the operating body 5 by fitting it in the operating groove 5b, the contact point 6d of the sliding body 6 rotating with the operating body 5 slides on the resistor film 8 as desired. The resistance value is obtained, and the rotational position is regulated by contact between the inner convex portion 3b of the upper case 3 and the outer convex portion 5d of the operating body 5.

As described above, according to the above embodiment, the upper case 3, the lower case 4, the central terminal plate 1 formed integrally with the upper case 3, the upper case 3 and the lower case 4 are formed.
An engagement formed by a base plate 7 held so as to be sandwiched between the base plate and a slide body 6 arranged so as to slide with respect to the base plate 7, and extending from the central terminal plate 1. While temporarily fixing the upper case 3 and the lower case 4 combined by engaging the portion 1f with the groove-shaped engaging portion 4c at the center of the holding convex portion 4b formed on the lower case 4, Further, the holding claw 1g of the central terminal plate 1 is attached to the lower case 4
Are crimped so as to sandwich the holding convex portion 4b from both sides, and the meat of the holding convex portion 4b of the lower case 4 is brought close to the engaging portion 1f side of the central terminal plate 1, and the upper case 3 and the The lower case is more firmly fixed, the hooking portion 1i of the holding claw 1g of the central terminal plate 1 snaps into the holding convex portion 4b formed on the lower case 4, and the central terminal plate 1 The engaging portion 1f of the above is engaged with the groove-like engaging portion 4c at the center of the holding convex portion 4b of the lower case 4, and the upper case 3 and the lower case 4 combined are fixed and fixed. It eliminates the need for an adhesive.

Also, a film-like material such as polyimide can be easily used as the substrate 7, and since the substrate 7 does not have to be insert-molded with the lower case 4 or the like, the substrate 7 is made of ceramic. And the like, there are no cracks, cracks, and eccentricity of the substrate 7 at the time of insert molding, and damage to the mold is reduced.
It is easy to prevent the occurrence of short shot defects, which are likely to occur when the substrate 7 is insert-molded, and the molding is easy because only the central terminal plate 1 / and the lead-out terminal 2 are inserted. .

Further, the contact 6d of the sliding body 6 and the periphery of the resistor film 8 are surrounded by the central terminal plate 1, the upper case 3, the substrate 7 and the lower case 4 to form a dustproof structure. By making the central terminal plate 1 continuous by the connecting rod 10, it is possible to continuously and easily assemble and improve mass productivity.

Although the upper case 3 and the lower case 4 are connected by the intermediate portion 2g of the lead terminal 2, the lead terminal 2 is not inserted in the lower case 4 and the lower case 4 is a single body. Alternatively, the upper terminal 3 may be replaced by the central terminal plate 1 instead of the lead-out terminal 2.
The upper case 3 and the lower case 4 may be combined and fixed by bending the connecting portion of the central terminal plate 1 so that the upper case 3 and the lower case 4 are connected to each other. Although the central terminal plate 1 is insert-molded in the upper case 3, the central terminal plate 1
The operation body 5 and the sliding body 6 may be attached to the upper case 3 and the engaging portion 1f of the central terminal plate 1 may be engaged with the engaging portion 4c of the lower case 4. When the holding claws 1g of the central terminal plate 1 are fitted together,
It is assumed that they are respectively bent and crimped to the holding convex portion 4b side, but the central terminal plate 1 is not provided, and instead of the central terminal plate 1, an engaging portion and a holding claw are formed on the lead terminal 2. Also, a part of the central terminal plate 1 is formed integrally with the lower case 4, and the engaging portion 1f of the central terminal plate 1 extends from the lower case 4 side and is formed in the upper case 3. It may be engaged with the central engaging portion of the holding convex portion.

An engaging portion is formed on the lead-out terminal 2,
It may be engaged with a central engaging portion of a holding convex portion formed on the lower case 4 or the upper case 3, and the holding claw 1g of the central terminal plate 1 extends from the lower case 4 side. It may be taken out and caulked to a holding convex portion formed on the upper case 3, or a holding convex portion formed on the upper case 3 or the lower case 4 by forming a holding claw on the lead terminal 2. Alternatively, the engaging portion 1f of the central terminal board 1 and the holding claw 1g may be formed on the two surfaces of the lower case 4, and the central engaging portion and the holding convex portion of the holding convex portion. Or in the center engaging portion and the holding convex portion of the holding convex portion formed on the two surfaces of the lower case 4 or the upper case 3 by forming the engaging portion and the holding claw on the lead terminal 2. , Or the central terminal plate 1 and the lead-out terminal 2,
The lower case 4 is formed with an engaging portion and a holding claw, respectively.
Alternatively, the upper case 3 and the lower case 4 may be fixed to each other by engaging and caulking at least two surfaces of the upper case 3.

Further, although the operating body 5 and the sliding body 6 are rotated with respect to the central hole 1a of the central terminal plate 1, the central hole 1a of the central terminal plate 1 is formed in a long hole shape. The operating body 5 and the sliding body 6 may directly move, and the operating body 5 is attached to the central terminal board 1.
It is also possible to form a mounting portion on the sliding body 6 and to mount the sliding body 6 on the central hole 1a of the central terminal plate 1 by caulking or the like. 1 or may be arranged between the upper case 3 and the substrate 7 to operate the operating body 5 projecting from the central hole 1a of the central terminal plate 1 or from the central hole 1a. is there.

Although the substrate 7 is a single body that is not insert-molded in the lower case 4, it may be formed integrally by insert-molding, and the upper case 3 and the lower case 4 are formed. At this time, the passage gate may be connected to allow resin to flow from the gate on one case side to integrally form the resin, and then the passage gate may be cut.

Although a variable resistor is shown as an example in the present embodiment, it goes without saying that the present invention can be similarly applied to a variable capacitor or a switch.

[0033]

As is apparent from the above embodiment, the present invention has two cases, a central terminal plate fixed to one of the two cases, and held between the two cases. A holding projection formed on the other case, comprising a substrate and a sliding body arranged so as to slide with respect to the substrate, and an engaging portion formed by extending from the central terminal plate. Holding claws that engage with the groove-shaped engaging portion in the center of the case and that are formed to extend from the central terminal plate and face each other in pairs are crimped so as to sandwich the holding convex portions of the case from both sides. Thus, the two cases, the central terminal plate fixed to one of the two cases, the substrate held between the two cases, and the board disposed so as to slide with respect to the board. For holding a pair of sliding bodies extending from the central terminal plate Of the holding claws are formed so as to project in the vicinity of the opposite ends of the holding claws, and at the same time when the two cases are assembled, the holding claws of the holding claws are snap-locked to the holding projections formed on the other case. Since the engaging portion extending from the central terminal plate engages with the groove-shaped engaging portion at the center of the holding convex portion of the other case, the two cases are fixed. There is no need for an adhesive for fixing the two cases, and a polyimide film or the like can be easily used as the substrate, and the substrate is not insert-molded with the lower case or the like. Therefore, when the substrate is formed of ceramic or the like, there are no cracks, cracks and eccentricity of the substrate during insert molding, less damage to the mold, and when the substrate is insert molded, etc. Preventing the occurrence of short shot defects that are likely to occur easily because the selection range of molding conditions such as injection pressure can be expanded, and the contacts of the sliding body and the periphery of the resistor film are surrounded by the central terminal plate, the upper case, the substrate. Further, by being surrounded by the lower case, a dustproof structure can be provided, and an adjustable electronic component that is easy to assemble and economical can be provided.

[Brief description of drawings]

FIG. 1 is a top view of a variable resistor that is an embodiment of a variable electronic component of the present invention.

FIG. 2 is a cross-sectional view obtained by combining the AA ′ and BB ′ cross sections of FIG. 1 with XX ′.

FIG. 3 (a) is a front view of the same. (B) A front view in which the shape of the holding claw 1g which is the main part is changed

FIG. 4 is a top view of the substrate, which is the main part of the same.

FIG. 5 (a) is a top view of the operation body, which is the main part of the same. (B) Side view (C) Bottom view

FIG. 6A is a top view of a sliding body, which is the main part of the same. (B) Side view

FIG. 7 is a top view showing that the central terminal plate, which is the main part of the same, is in a state of being connected to the connecting shaft (a hoop-shaped central terminal plate).

FIG. 8 is a sectional view taken along the line CC ′ of FIG. 7.

9 is a top view showing a state where the hoop-shaped central terminal plate of FIG. 7 and the upper case and the lower case of FIG. 2 are integrally molded.

10 is a sectional view taken along the line DD ′ of FIG.

FIG. 11 is a bottom view of FIG.

FIG. 12 is a cross-sectional view showing a state in which the sliding body of FIG. 2 is assembled in the state of FIG.

FIG. 13 is a side view showing a state before the upper case and the lower case of FIG. 2 are assembled.

FIG. 14 is a side sectional view of a variable resistor which is a conventional variable electronic component.

FIG. 15 (a) is a top view showing a state in which a middle terminal and an outer terminal are respectively connected to a substrate which is the same part and which is integrated with a case by insert molding.

[Explanation of symbols]

1 Central terminal board 1f engaging part 1g holding claw 1i hanging part 3 upper case 4 lower case 4b retaining projection 4c Engagement part 6 Sliding body 7 substrate

Claims (2)

(57) [Claims] 1. Two cases, a central terminal plate fixed to at least one of the two cases, a substrate held between the two cases, and a sliding body with respect to the substrates. An engaging portion formed by extending from the central terminal plate is engaged with a groove-shaped engaging portion in the center of the holding projection formed on the other case. In addition, the holding claws extending from the central terminal plate and facing each other in a pair are crimped so as to sandwich the holding projections of the other case from both sides, so that the two cases are separated. Variable electronic components that are combined and fixed. 2. The two cases, a central terminal plate fixed to at least one of the two cases, a substrate held between the two cases, and a sliding body with respect to the substrates. And a pair of holding claws extending from the central terminal plate are formed with protruding hooking portions in the vicinity of the facing ends of the pair of holding claws. An engaging portion formed by snap-locking the hooking portion of the use claw to the holding convex portion formed on the other case, and further extending from the central terminal plate, forms a holding convex portion on the other case. A variable electronic component in which the two cases are combined and fixed by engaging with a groove-shaped engaging portion in the center of.