JP2824727B2 - Rotary 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 rotary electronic component.

[0002]

2. Description of the Related Art Conventionally, a rotary variable resistor has been used as a volume for volume control in an audio product (for example, a small portable stereo).

FIG. 6 is a side sectional view showing a rotary variable resistor of this type. As shown in FIG. 1, a conventional rotary variable resistor 100 includes a substrate 80 and a sliding object 9 on an earth plate 70.
0 is attached. Here the ground plate 70
Is formed of a metal plate, and a cylindrical projection 71
Is erected.

A ring-shaped pattern 81 is formed on the upper surface of the substrate 80, and a through hole 8 is formed substantially in the center thereof.
3 are provided.

The sliding object 90 is made of synthetic resin and has a through hole 93 substantially at the center thereof, and a metal slider 91 slidingly contacting the pattern 81 of the substrate 80 on the lower surface thereof. Installed. A ring-shaped support projection 95 centered on a through hole 93 is provided on the lower surface of the sliding mold 90.
Is provided.

The cylindrical projection 71 of the ground plate 70 is inserted into the through-hole 83 of the substrate 80 and the through-hole 93 of the sliding object 90.
And the tip is swaged, the sliding object 90 is rotatably supported on the substrate 80. At this time, the sliding type object 90
The slider 91 mounted on the substrate abuts on the pattern 81 of the substrate 80, and the support projection 95 provided on the sliding die 90 abuts on the surface of the substrate 80.

The reason why the support projections 95 are brought into contact with the substrate 80 is to prevent the sliding type object 90 from rattling. That is, when the diameter of the sliding-type object 90 is large as in the conventional example, it is not reliable to fix the sliding-type object 90 only by pivotally supporting the center thereof. When the sliding type object 90 is rotated by, for example, the slide type object 90 will play in the thickness direction (the direction of the arrow a shown in the figure). Therefore, the sliding type object 90
The support protrusions 95 and the substrate 80 on the lower surface near the outer periphery of the
Are brought into contact with each other, thereby preventing the play.

[0008]

However, in the rotary variable resistor 100 having the above-described structure, when the sliding type object 90 is rotated, the support projection 95 of the sliding type object 90 made of an insulating material and the substrate 80 are rotated. Are slid in contact with each other, so that static electricity is generated between the two members due to friction, and they are charged. Then, there is a problem that the static electricity enters the pattern 81 provided on the substrate 80 as noise.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to provide a rotary electronic component which can prevent play even when the diameter of a sliding type object is large and does not generate electrostatic noise. Is to do.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a ground plate made of a metal plate, a substrate having a desired pattern formed on an upper surface thereof, and a synthetic resin resin having a lower surface formed on a lower surface thereof. A rotary electronic component having a structure in which a sliding type object on which a metal slider that is in sliding contact with the pattern of the substrate is mounted, and the sliding type object is rotatably supported on the ground plate. , Sliding projections formed by deforming the ground plate itself are provided at a plurality of positions on the ground plate facing the sliding die, and the sliding die is brought into contact with the sliding projections of the ground plate to slide the grounding plate. The moving object is slidably supported.

[0011]

The sliding type object is not only rotatably supported by the earth plate but also supported by the sliding type object coming into contact with the sliding contact projection of the earth plate. Therefore, when the sliding type object is rotated, it does not rattle in the thickness direction.

On the other hand, when the sliding type object is rotated, the slider attached to the sliding type object slides on the pattern of the flexible substrate, and at the same time, the sliding type object slides on the sliding contact projection of the ground plate. Touch For this reason, static electricity is generated in the sliding contact portion, and the static electricity flows to the ground through the metallic sliding contact projection. Therefore, no static electricity is charged to the sliding contact portion, and no noise is generated by the static electricity.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is an exploded perspective view showing a rotary variable resistor 1 according to one embodiment of the present invention. As shown in FIG. 1, the rotary variable resistor 1 is configured by attaching a flexible substrate 20 and a sliding object 30 on an earth plate 10. Hereinafter, each component will be described.

FIG. 2 is a sectional view of the ground plate 10 shown in FIG.
FIG. As shown in FIGS. 1 and 2, the ground plate 10 is formed by pressing a metal plate, a cylindrical projection 11 is provided at the center thereof, and four places on the outer periphery thereof. Are provided with sliding contact projections 13 (13-1 to 13-4) protruding upward. The sliding contact protrusion 13 is formed by deforming the ground plate 10 itself by press working, and has a height higher than the thickness of the flexible substrate 20.

At a predetermined position on the outer periphery of the ground plate 10, there is provided a locking tongue piece 15 which is in the form of a tongue piece and which is bent upward at a right angle.

At a predetermined position on the outer periphery of the ground plate 10,
Two attachment pieces 17, 17 bent downward are provided.

Next, as shown in FIG. 1, a flexible substrate 20 is formed on a thin film 21 made of synthetic resin by four concentric patterns 23 (conductor pattern and resistor pattern).
, And a through-hole 25 is provided at the center thereof so as to pass through the cylindrical projection 11 of the ground plate 10.

At the end of each pattern 23, a metal terminal 27 made of a metal plate is firmly connected.
These metal terminals 27 are bonded to one end of each metal terminal 27 on the end of each pattern 23 with a conductive adhesive.
A band-shaped reinforcing film 26 of the same quality as the film 21 is further placed thereon.
Is mounted, and the film 21 having no metal terminal 27 and the reinforcing film 26 are welded and fixed by ultrasonic welding.

Further, a concave portion 28 and a hole 29 are provided on the outer periphery of the film 21. Here, the concave portion 28 engages with the locking projection 15 provided on the ground plate 10 to restrict the rotational displacement of the flexible substrate 20.
The hole 29 is for penetrating the sliding contact 13-1 of the ground plate 10.

3 and 4 are views showing the sliding type object 30, FIG. 3 is a side sectional view (a sectional view taken along the line BB in FIG. 4), and FIG.
Is a rear view. As shown in FIGS. 1, 3, and 4, the sliding type object 30 is formed by molding a synthetic resin into a substantially disk shape, and has a cylindrical projection 11 of the ground plate 10 at the center thereof.
Are provided, and projections 33 for fixing the sliders 40 and 40 shown by dotted lines in FIG. 4 are provided on the lower surface thereof.

On the outer side of the projection 33, a ring-shaped support projection 35 is provided projecting from the through hole 31 as a center.
The support projection 35 is provided at a position where it comes into contact with the four sliding contact projections 13-1 to 13-4 (see FIG. 1) provided on the ground plate 10.

Next, a ring-shaped concave portion 37 for inserting the locking tongue piece 15 (see FIG. 1) of the ground plate 10 is provided outside the support projection 35. Restriction portions 38, 38 for restricting the movement of the tongue piece 15 are provided (see FIG. 4).

Then, as shown in FIG.
Sliders 40, 40 made of a metal plate are attached to the lower surface of 0, and are fixed to the sliding mold 30 by heat-staking the projections 33.

In order to assemble the rotary variable resistor 1, a flexible substrate 20 is first placed on a ground plate 10, as shown in FIG. At this time, the cylindrical projection 11, the locking tongue piece 15, and the sliding contact projection 13-1 of the ground plate 10 are inserted into the through hole 25, the concave portion 28, and the hole 29 of the flexible substrate 20, respectively.

Next, the sliding object 3 is placed on the flexible substrate 20.
Place 0. At this time, the cylindrical projection 11 of the ground plate 10
Is inserted into the through hole 31 of the sliding die 30. Also, at this time, the upper part of the locking tongue piece 15 of the ground plate 10 is located in the concave portion 37 of the sliding die 30 shown in FIGS.

At this time, the sliders 40, 40 (see FIG. 4) attached to the lower surface of the sliding die 30 elastically contact the pattern 23 of the flexible substrate 20 shown in FIG.

Then, when the tip of the cylindrical projection 11 of the ground plate 10 shown in FIG. 1 is swaged on the upper surface of the through hole 31 of the sliding die 30, the rotary variable resistor 1 is completed. The state at this time is shown in FIG. However, in FIG. 5, for convenience of explanation,
The projection 33 and the sliders 40, 40 provided on the sliding type object are omitted. The mounting pieces 17, 17 of the ground plate 10
Is attached to another substrate (not shown) or the like and grounded.

As shown in the figure, the sliding type object 30 is not only rotatably supported at the center by the cylindrical projection 11 of the ground plate 10 but also at the outer periphery thereof in the vicinity of the ground plate 1.
The sliding protrusions 13-1 to 13-4 of the sliding member 30 are also supported by contact with the supporting protrusions 35 of the sliding mold 30. Therefore, even if a force in the direction of arrow C shown in FIG. 5 is applied to the sliding type object 30, it does not rattle in this direction.

On the other hand, when the sliding die 30 is rotated, the sliders 40, 40 (see FIG. 4) attached to the sliding die 30 slide on the pattern 23 (see FIG. 1) of the flexible substrate 20. However, at the same time, as shown in FIG. 5, the support projection 35 of the sliding mold 30 is
1 to 13-4 (FIG. 5 shows two sliding projections 13).
-1, 13-2).

As a result, static electricity is generated at the portion of the support projection 35, and the static electricity is generated by the metal sliding contact projections 13-1 to 13-1.
From 13-4, it flows to the earth through the earth plate 10. Therefore, the static electricity is not charged to the support projection 35, so that noise due to the static electricity is not generated.

In FIG. 5, when the sliding die 30 is rotated, the sliding contact is made between the inner peripheral surface of the through hole 31 of the sliding die 30 and the cylindrical projection 11 of the ground plate 10. Is also grounded through the cylindrical projection 11, so that no noise is generated by the static electricity.

When the sliding type object 30 is to be rotated by a predetermined angle or more, the locking tongue piece 15 (see FIG. 1) provided on the ground plate 10 is provided in the concave portion 37 of the sliding type object 30. Part 3
8, 38 (see FIG. 4), and its rotation is regulated.

In the above embodiment, the support projection 35 and the sliding contact projections 13-1 to 13-4 are brought into sliding contact with each other. However, the support projection 35 is not necessarily required.
-4 may be slid directly on the lower surface of the sliding type object 30.

In the above embodiment, the ground plate 10
Although the sliding type object 30 is rotatably supported on the ground plate 10 by the cylindrical projection 11 provided in the above, the present invention is not limited to this. For example, a projection is provided at the center of the lower surface of the sliding type object 30, The protrusion 30 is rotatably engaged with a hole provided at the center of the ground plate 10 to support the shaft.
May be attached to the ground plate 10.

Although a rotary variable resistor is used in the above embodiment, the present invention is not limited to this, and may be applied to other rotary electronic components such as a rotary switch.

In the above embodiment, the flexible substrate is used as the substrate. However, the present invention is not limited to this, and another ordinary rigid substrate may be used.

[0037]

As described above in detail, according to the rotary electronic component of the present invention, the play of the sliding type object in the thickness direction can be reliably prevented, and furthermore, the generation of electrostatic noise can be prevented. It has an excellent effect that there is no.

[Brief description of the drawings]

FIG. 1 shows a rotary variable resistor 1 according to one embodiment of the present invention.
FIG.

FIG. 2 is a sectional view of the earth plate 10 shown in FIG.

FIG. 3 is a side sectional view of the sliding die 30;

FIG. 4 is a rear view of the sliding die 30;

FIG. 5 is a side sectional view of the rotary variable resistor 1;

FIG. 6 is a side sectional view showing a conventional rotary variable resistor.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 rotary variable resistor (rotary electronic component) 10 ground plate 13-1 to 13-4 sliding contact projection 20 flexible substrate (substrate) 23 pattern 30 sliding type object 40 slider

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 3-88303 (JP, U) JP-A 52-66941 (JP, U) JP-A 40-36455 (JP, Y1) (58) Field (Int.Cl. ⁶ , DB name) H01C 10/00-10/50

Claims (1)

(57) [Claims] 1. A substrate having a desired pattern formed on an upper surface thereof, and a metal slider made of synthetic resin, which is in sliding contact with the pattern of the substrate, is mounted on a lower surface of the ground plate made of a metal plate. A rotary type electronic component having a structure in which the sliding type object is placed and the sliding type object is rotatably supported with respect to the ground plate. A sliding contact projection which deforms the ground plate itself is provided at a position, and the sliding type object is brought into contact with the sliding contact projection of the ground plate to support the sliding type object slidably. Rotating electronic components.