JP3380680B2 - Electrical component - Google Patents

Description

Detailed Description of the Invention

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to electric parts used in various audio equipments, communication devices and the like.

[0001]

2. Description of the Related Art A conventional electric component will be described with reference to a rotary variable resistor disclosed in, for example, Japanese Patent Laid-Open No. 63-40301. A conventional electric component, for example, a rotary variable resistor will be described with reference to FIGS. In FIG. 7, a circular knob 1 made of molded resin and a circular hole 1a in its center are provided, and a fine annular portion 1 is provided near the outer periphery of the lower surface.
b. An arcuate groove 1d is formed on the outer peripheral side of the annular portion 1b with a stopper portion 1e.
Further, a circular resistance substrate 2 made of an insulating material as shown in FIG. 9 is arranged inside the annular portion 1b with a circular hole 2a in the center thereof correspondingly. At this time, the resistance substrate 2 is positioned and mounted on the knob 1 without play. On the other surface of the resistance substrate 2, a resistance printing layer 2c and circular conductor printing layer layers 2d and 2e are arranged concentrically with respect to the circular hole 2a of the resistance substrate 2.

Further, a stepped column 3a for supporting the circular hole 1a of the knob 1 is provided at the center of the base portion 3 made of an insulating resin.
And rotatably fitting and supporting the knob 1, and inserting and fitting a spacer 4 into the tip of the stepped support column 3a protruding above the knob 1, and by using a method such as thermal caulking, the tip of the stepped support column 3a. Is held open to hold knob 1 in place. Further, the protrusion 3b of the base portion 3 is fitted into the arc-shaped groove 1d of the knob 1 and is brought into contact with the stopper portion 1e so as to come into contact with the knob 1
Serves as a stopper that regulates the rotation angle of. Further, the flat plate portion of the base portion 3 is made of an elastic metal, and contact portions 5a, 5b, 5c which are elastically contacted with the resistance printing layer 2c and the circular conductor printing layers 2d, 2e on the other surface of the resistance substrate 2. Three independent elastic contact bodies 5 having the above are formed so as to be exposed inside the opening 3c. And the contact points 5a and 5
The base portions of b and 5c are insert-molded inside the base portion 3, and external connection terminal portions 5d and 5e are provided outside the base portion 3.
・ It is formed by extending 5f.

In the conventional electric component having such a structure, the contact parts 5a, 5b, 5c are simply insert-molded inside the base part 3 so that the contact parts 5a, 5b, 5c are formed.
Cannot be elastically contacted with the printed resistance layer 2c and the circular conductor printed layers 2d and 2e of the resistance substrate 2. Therefore, angular openings 3c are formed around the contact portions 5a, 5b, 5c which are insert-molded and attached inside the base portion 3.
Is provided, and the contact portions 5a and 5b are formed by utilizing the opening 3c.
・ 5c is bent upward at a predetermined angle. However, if the base portion 3 has the opening 3c, there is a problem that flux, dust, and the like enter the inside of the electric component through the opening 3c to impair the performance of the electric component.

Further, in the central portion of the base member 3 made of insulating resin,
The stepped support pillar 3a is formed integrally with the base portion 3,
The knob 1 is combined by a method such as heat caulking.
Therefore, when an electric component is attached to a printed circuit board or the like (not shown) by soldering or the like, there is a problem that the stepped column 3a is thermally deformed by the heat of the solder. Further, since the knob 1 is combined at the tip of the stepped column 3a by a method such as thermal caulking, when the soldering to the printed circuit board is performed by a machine such as a dipping device, the atmospheric temperature inside the dipping device becomes high. Therefore, there is a problem that the heat-crimped portion is deformed by heat. Therefore, in the conventional electric component, there is a problem that the rotation torque of the knob 1 changes.

[0005]

According to the conventional electric component, in order to elastically contact the contact portions 5a, 5b, 5c with the printed resistance layer 2c and the circular conductor printed layers 2d, 2e of the resistance substrate 2, the above-mentioned structure is used. The opening 3c is formed in order to bend the contact portions 5a, 5b, 5c upward at a predetermined angle. However, if the base portion 3 has the opening 3c, the opening 3c
There is a problem that flux, dust, and the like enter the inside of the electric component from c and impair the performance of the electric component.

Further, a stepped column 3a is formed in the central portion of the base body portion 3 so as to be integrated with the base body portion 3, and the knob 1 is provided.
Are combined by a method such as heat caulking. for that reason,
When attempting to attach a conventional electric component to a printed circuit board or the like (not shown) by soldering or the like, there is a problem that the stepped column 3a is thermally deformed by the heat of soldering. Also, the stepped column 3
Since the tip of a is combined with the knob 1 by a method such as thermal caulking, when the soldering to the printed circuit board is attempted by a machine such as a dipping device, the atmospheric temperature inside the dipping device becomes high. There has been a problem that the heat-crimped portion is thermally deformed. Therefore, in the conventional electric component, there is a problem that the rotation torque of the knob 1 changes.

[0007]

As a first means for solving the above-mentioned problems, a support shaft projectingly formed in a substantially central portion,
And a mounting plate made of metal having a projection formed by bending at one corner and the mounting plate mounted on the surface of the mounting plate,
A mounting hole into which the spindle is fitted, and a recess into which the protrusion is fitted.
Part or through hole, and one side closed with the mounting plate
An insulator having an opening formed between the insulator and the opening of the insulator.
A slider piece having an elastic force, which is disposed so as to be exposed inside,
A rotating body rotatably supported by the support shaft, and the rotating body
Is mounted on the resistor element on which the slider piece slides.
It has a structure having a conductive pattern . As a second means for solving the above problems, and a closely fitted constituting the rotating body to the other of said opening of said insulator. Further, as a third means for solving the above problems, the
The rotating body is equipped with a rotation angle regulation groove, and the tip of the protrusion is
The rotary body is configured to be inserted into the rotation angle regulating groove . Further, as a fourth means to solve the problem, the
Mounting legs are cut and raised on the mounting plate,
An opening is formed at the cut and raised portion, and the opening is the insulating layer.
It was configured to be closed by the body .

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of an electric component according to the present invention will be described below with reference to FIGS.
Will be described with reference to. The electric component of the present invention, that is, the rotary variable resistor, includes a metal mounting plate 11 in FIG. 1, an insulator 12 mounted on the upper surface of the mounting plate 11, and a substrate on the upper surface of the insulating body 12. The rotary body 14 to which 13 is attached is sequentially stacked.

First, the mounting plate 11 has a substantially rectangular shape, and a chamfer is formed at one corner on one side in the longitudinal direction thereof. Also,
A protrusion 11a is formed by bending upward on one corner on the other side. A supporting shaft 11b is integrally formed with the mounting plate 11 so as to project upward at a substantially central portion of the mounting plate 11 by drawing or the like. The protruding length of the support shaft 11b is formed to be slightly longer than the stacking dimension of the insulator 12, the substrate 13, and the rotating body 14. Also, the mounting plate 11
The mounting plate 11 is provided between the end surface 11c and the support shaft 11b.
A pair of mounting legs 11d and 11d, which are cut and raised in a double-door shape and bent downward, are formed through an opening 11e from the inner side to the outer side including the central portion in the longitudinal direction. The mounting leg 11d is the one end portion 1 of the mounting plate 11.
It is formed near 1 m and the other end 11 n. In addition, a crosspiece 11f is formed between the openings 11e and 11e which are formed by cutting and raising the pair of mounting legs 11d and 11d in a double-door shape to reinforce the strength of the mounting plate 11. Further, a protruding piece 11g is formed so as to project forward at a substantially central portion of the end surface 11c. Then, the through hole 11 is provided at a predetermined position of the narrow flat portion between the projecting piece 11g and the crosspiece 11f.
h is formed.

The insulator 12 has a semicircular shape on one side and a straight surface 12m on the other side, and is formed in a substantially D shape. A plurality of elastic slider pieces 12a made of phosphor bronze or the like are integrally formed on the insulator 12 by insert molding or the like using a molding resin material. Further, as shown in FIG. 2, a mounting hole 12b is formed in a substantially central portion of the insulator 12. In addition, the insulator 1
In the portion where the second slider piece 12a is formed, the slider piece 1
Square-shaped openings 12c and 12d for bending 2a
12e is formed. Then, the openings 12c and 12
Inside the d · 12e, the slider piece 12a is exposed and is bent upward.

Further, as shown in FIG. 3, the slider piece 12
The contact portion at the tip portion of a is formed so as to project from the projecting surface 12f provided around the mounting hole 12b.
Bending is performed using 2c, 12d, and 12e, and it is formed by bending upward at a predetermined angle. A cutout-shaped recess 12g is formed on the semicircular outer peripheral surface on one side of the insulator 12, and the protrusion 11a of the mounting plate is formed.
Are fitted. Further, on the surface of the insulator 12, a concave surface 12k, which is slightly larger than the outer diameter of the substrate 13 described later, is formed.
It is formed with a hollow from the surface of 2. Further, a through hole 12h is formed so as to penetrate at a predetermined location on one side of the insulator 12. Further, a terminal 12j extending from the slider piece 12a and connected thereto is formed by bending downward on the linear surface 12m on the other side.
Then, the support shaft 11b and the protrusion 11a of the mounting plate 11 described above.
Then, the mounting hole 12b of the insulator 12 and the recess 12g are fitted to each other, and the blocked insulator 12 is positioned and mounted on the mounting plate 11. At this time, the protrusion 1
The recess 12g for positioning the 1a is not limited to the notch shape, and may be a through hole into which the protrusion 11a fits without play.

Further, the openings 12c, 12d, ...
One side of 12e is closed by the flat portion 11j of the mounting plate 11, and the openings 12c, 12d, 1 of the insulator 12 are closed.
The flux and dust are prevented from entering the inside of the variable resistor from one side of 2e, and the two openings 1 of the mounting plate 11 are prevented.
Since the lids 1e and 11e are closed by the flat portion 12n on the back surface of the insulator 12, the two openings 11e of the mounting plate 11 are formed.
-From 11e, dust and the like are prevented from entering the inside of the electric parts. Further, the substrate 13 is disc-shaped, and the detent portion 13a formed by cutting the other side in a linear shape is formed and is made of a material such as a phenol resin laminated plate. A resistor 13d is formed on the substrate 13 by printing or the like on the surface facing the slider piece 12a. Further, a mounting hole 13b is formed in the central portion of the substrate 13, and a through hole 13c is formed in a predetermined place on one side, and the surface around the mounting hole 13b is the protruding surface 12 of the insulator 12.
It comes in contact with f.

The rotating body 14 is substantially disk-shaped and is made of synthetic resin or the like. The outer periphery 14a is formed with a mountain-shaped concavo-convex shape in order to prevent the operator's fingers or the like from slipping.
In addition, a mounting hole 14b into which a support shaft 11b formed on the mounting plate 11 is fitted is formed at the center thereof, and a through hole 14c is formed at a predetermined location near the outer periphery 14a. As shown in FIG. 4, the back surface of the rotating body 14 has the same shape as the outer shape of the board 13, and the board mounting portion 14d has a thickness dimension of the board 13 so that the outer shape of the board 13 is fitted without play. And a little deeper, and the rotation stopping portion 14
forming j. Around the mounting hole 14b, a protrusion 14e into which the mounting hole 13b of the substrate 13 is fitted is formed. In addition, the board mounting portion 1 of the rotating body 14
A rotation angle restriction groove 14f for determining a rotation angle of the rotating body 14 is provided between the 4d and the outer periphery 14a, and has a predetermined width and depth.
It is formed in an arc shape at an angle. The tip of the protrusion 11a of the mounting plate 11 is inserted into the rotation angle regulation groove 14f to function as a stopper for regulating the rotation angle of the rotating body 14.

The rotating body 14 having such a structure is handled in a state in which the substrate 13 is combined with the substrate mounting portion 14d while being prevented from rotating. Then, the rotating body 1 in which the substrate 13 is attached to the insulator 12
4, the rotary body 14 is rotatably supported by being caulked to the support shaft 11b of the mounting plate 11. At this time, the slider piece 12a is pressed into contact with the resistor 13d formed on the substrate 13 to move the opening 12a.
c, 12d, 12e are pushed down into the opening 1
The rotating body 14 is closely combined with the other of 2c, 12d, and 12e. Therefore, the lid 12 is closed from above and below one of the openings 12c, 12d, and 12e of the insulator 12, so that flux, dust, and the like can be prevented from entering the inside of the electric component, that is, the rotary variable resistor. Further, the through hole 11h of the mounting plate and the through hole 12h of the insulator 12
And the through hole 13c of the substrate 13 and the through hole 1 of the rotating body 14.
4c is a state in which they overlap with each other at an equal distance from the axis. Further, as shown in FIG. 5, the protruding piece 11g of the mounting plate 11 extends to the vicinity of the outer periphery 14a of the rotating body 14, and the length of the extension is such that the tip of the protruding piece 11g is the opening of the cabinet 17. It is located inside 17a.

Assembling and operation of the electric component of the present invention having the above-mentioned structure, that is, the rotary variable resistor will be explained. As shown in FIG. 1, the positioning pin 15a attached to an assembling jig (not shown) has the above-mentioned structure. Through hole 11 of mounting plate 11
Similarly, h is inserted, and similarly, the hole of the support shaft 11b of the mounting plate 11 is inserted into the positioning pin 15b, and the mounting plate 11 is placed on the assembly jig. Next, the insulator 12 is attached to the positioning pin 15a protruding through the through hole 11h of the mounting plate 11.
When the through hole 12h and the mounting hole 12b are inserted into the support shaft 11b, the recess 12g of the insulator 12 is positioned and fitted to the protrusion 11a.

Next, the rotator 14 is attached to the positioning pin 15a protruding through the through hole 12h of the insulator 12.
The mounting plate that simultaneously inserts the through hole 13c of the substrate 13 and the through hole 14c of the rotating body 14 that are fitted and mounted in the substrate mounting portion 14d of the above, and projects from the mounting hole 12b of the insulator 12 11 support shaft 11b for mounting hole 14b
Is inserted, the resistor 13d formed on the substrate 13
The slider pieces 12a face each other and contact each other. At this time, the tip of the projection 11a of the mounting plate 11 is inserted into the rotation angle restriction groove 14f formed on the back surface of the rotating body 14. The tip of the protrusion 11a in the inserted state is in contact with the one end side 14g of the rotation angle regulating groove 14f.

In this way, the insulator 12,
When the substrate 13 and the rotating body 14 are stacked, the tip of the support shaft 11b of the mounting plate 11 is in a state of protruding from the mounting hole 14b of the rotating body 14. At this time, the rotating body 14 to which the substrate 13 is fitted and attached is lifted upward by the elasticity of the slider piece 12a, and a gap is formed between the rotating body 14 and the insulator 12. There is. When the tip end of the support shaft 11b is caulked by a jig (not shown) from such a state, the periphery of the protruding portion 14e of the rotating body 14 is pressed against the protruding surface 12f of the insulator 12. The gap between the rotating body 14 and the insulator 12 is eliminated, and a constant rotational actuating force can be obtained even if the thickness of the substrate 13 varies. In addition, the rotating body 14
The protrusion 11a of the mounting plate 11 in the rotation angle regulating groove 14f of
The assembly of the rotary variable resistor of the present invention is completed in the state where the tip of is positioned.

Next, when the rotary type variable resistor which has been assembled is taken out from the assembly jig (not shown), the through holes 11h, 12h, 13c, 14c of the respective parts are taken out.
The positioning pin 15a that was fitted to the support shaft 11b and the other positioning pin 15b from the hole of the support shaft 11b come out, so that the rotating body 14 has a predetermined rotational torque and the rotation angle regulating groove 14f.
It becomes possible to rotate within a range from one end side 14g to the other end side 14h. One use state of the rotary variable resistor of the present invention will be described. As shown in FIG. 5, the rotary variable resistor of the present invention has a terminal 12 j and a mounting leg 11 on a circuit board 16.
d is attached by soldering or the like. And
When a part of the outer circumference 14a of the rotating body 14 facing the outside of the cabinet 17 on the device side such as an audio device is rotated by a finger of a person or the like, the substrate 13 is rotated and the slider piece 12a of the insulator 12 is placed on the slider piece 12a. The resistance value is changed by sliding.

In the electric component of the present invention having such a structure, that is, the rotary variable resistor, one of the openings 12c, 12d and 12e formed in the insulator 12 is closed by the flat portion 11j of the mounting plate 11. Therefore, the opening 12c.1 of the insulator 12
It is possible to prevent flux, dust, and the like from entering the inside of the electric component from one of the 2d and 12e. Further, since the rotating body 14 is closely attached to the other of the openings 12c, 12d, 12e of the insulator 12, the openings 12c, 12d, 12e of the insulator 12 are closed from the upper and lower sides of one and the other. Furthermore, it is possible to reliably prevent the intrusion of flux, dust, etc. into the electric parts, that is, the inside of the rotation variable resistor.

Further, since the protrusion 11a fitted to the insulator 12 is provided on the outer peripheral end of the mounting plate 11, the protrusion 11 is formed.
The mounting plate 11 and the insulator 12 can be easily and reliably positioned at a predetermined position by using a and the support shaft 11b without any positional deviation. Further, since the mounting plate 11 and the insulator 12 are not displaced from each other, the opening of the insulator 12 can be surely closed without increasing the outer dimension of the mounting plate 11 more than necessary. Further, by inserting the protrusion 11a into the recess 12g or the through hole provided in the insulator 12 and the rotation angle regulating groove 14f of the rotor 14, the insulator 12 is positioned and the rotor 14 is rotated. Since it can also serve as a stopper that regulates the angle, and one component can perform two functions without increasing the number of parts, so that the product does not become large and the cost can be reduced.

In the embodiment of the present invention, the rotation direction of the substrate 13 is determined by the rotation stoppers 14j and 13a. Instead, the protrusions are provided on the back surface of the rotating body 14 to form the insulating substrate. The 13 may be provided with a hole into which the convex portion fits. Further, in the present invention, the positioning of the insulator 12 and the regulation of the rotation angle of the rotating body 14 are performed by the protrusion 11a provided on the mounting plate 11, but the insulator 12 may be provided with a protrusion. Further, the projecting piece 11g of the mounting plate 11 is deformed, bent upward to the rotating body 14 and extended, and the insulator 12 is provided with a recess for fitting the projecting piece 11g. Positioning with the plate 11 and regulation of the rotation angle of the rotating body 14 may be performed. Further, in the present invention, the resistor 13d is printed on the substrate 13 and attached to the rotating body 14. However, in another embodiment, the resistor 1d is used.
3d may be attached to the substrate 13 by insert molding. Alternatively, the resistor 13d may be directly formed on the rotating body 14 by a method such as printing or transfer without using the substrate 13. Further, in the description of the embodiments of the present invention, the rotary variable resistor has been described as an example, but the present invention is applied to electrical components such as the resistor 13d or a rotary encoder in which a circuit pattern including a conductor pattern is formed. It is also possible.

[0022]

As described above, according to the electric component of the present invention, that is, the rotary variable resistor, one of the openings formed in the insulator is closed by the mounting plate, so that the opening of the insulator is prevented. It is possible to provide an electric component that can prevent flux, dust, and the like from entering the inside of the electric component from one side. Further, by closing the other of the openings formed in the insulator with the rotating body, the insulator can be closed from above and below,
Since it is possible to reliably prevent the intrusion of dust or the like into the electric component, that is, the inside of the rotation variable resistor, it is possible to provide the electric component in which the performance is less deteriorated by the dust or the like.

Further, by fitting the projection of the mounting plate into the recess or through hole provided in the insulator and the rotation angle regulating groove formed in the rotor, the insulator can be positioned by one member. Since it can also function as a stopper that regulates the rotation angle of the rotating body, the product does not become large,
In addition, it is possible to provide a low-cost electric component.

[Brief description of drawings]

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

FIG. 2 is a plan view of an insulator of the rotary variable resistor according to the present invention.

FIG. 3 is a sectional view of an essential part of an insulator of a rotary variable resistor according to the present invention.

FIG. 4 is a bottom view of the rotating body of the rotary variable resistor according to the present invention.

FIG. 5 is a schematic view illustrating a usage state of the rotary variable resistor of the present invention.

FIG. 6 is a sectional view of an essential part of a rotary variable resistor according to the present invention.

FIG. 7 is a sectional view of a main part of a conventional rotary variable resistor.

FIG. 8 is a bottom view of a knob of a conventional rotary variable resistor.

FIG. 9 is a plan view of a resistance substrate of a conventional rotary variable resistor.

[Explanation of symbols]

1 knob 1a circular hole 1c protrusion 1d groove 1e Stopper part 2 resistor board 3 Base part 3a Stepped support 3b protrusion 3c opening 4 spacers 5 Elastic contact point 5a, 5b, 5c contact point 11 Mounting plate of the present invention 11a protrusion 11b spindle 11d mounting leg 11e opening 11g protruding piece 11h through hole 12 Insulator of the present invention 12a Slider piece 12b mounting hole 12c / 12d / 12e opening 12f protruding surface 12g recess 12h through hole 13 Substrate of the present invention 13a Detent part 13b Mounting hole 13c through hole 14 rotating body 14b rotating hole 14c through hole 14f Rotation angle regulation groove 15a Positioning pin 15b Positioning pin 16 circuit board 17 cabinets

Claims (4)

(57) [Claims] 1. A support shaft and a piece formed to project in a substantially central portion.
A metal mounting plate having protrusions formed by bending the corners, and the supporting shaft mounted on the surface of the mounting plate.
Mounting hole for fitting the
Is a through hole, and one side is closed by the mounting plate.
An insulator having an opening, and inside the opening of the insulator
An exposed slider piece having elastic force, and the support
A rotary body rotatably supported by a shaft and provided on the rotary body
A resistor on which the slider piece slides or
An electric component having a conductive pattern . Wherein the electrical component according to claim 1 wherein characterized in that attached closely to the rotating body to the other of said opening of said insulator. 3. The rotating body is provided with a rotation angle regulating groove,
Insert the tip of the protrusion into the rotation angle regulation groove of the rotating body.
Electrical component according to claim 1 or 2 Symbol mounting features that were input. 4. A mounting leg is cut and raised on the mounting plate.
As it is formed, an opening is formed in the cut and raised trace,
Electrical component according to claim 1 wherein wherein the opening is closed lid by the insulator.