JP3870040B2 - Rotating electrical parts - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotary electrical component that is suitably used for various electrical devices and the like and that outputs an electrical signal by rotating an operation shaft.
[0002]
[Prior art]
6 is a bottom view of a conventional rotary electrical component, and FIG. 7 is a cross-sectional view of a main part of the conventional rotary electrical component.
[0003]
A substrate 51 made of a synthetic resin molded product has a flat plate shape and has a hole 1a at the center. On the upper surface of the substrate 51, a horseshoe resistor (not shown) and a circular current collector ( (Not shown) is provided.
Further, terminals 52 and 53 are embedded in the substrate 51, the terminal 52 is connected to a current collector, and the terminal 53 is connected to a resistor.
The cover 54 made of a synthetic resin molded product includes a flat wall 54a, a side wall 54b extending downward from the periphery of the flat wall 54a, a plurality of locking portions 54c extending downward from the lower end of the side wall 54b, and a flat wall 54a. And a hole 54d provided in the center.
The cover 54 is attached to the substrate 51 by covering the upper surface of the substrate 51 so as to cover the resistor and the current collector, and latching the locking portion 54d on the side edge of the substrate 51.
[0004]
The rotating body 55 includes a shaft portion 55b having a non-circular hole 55a into which the operation shaft K is inserted and fitted, and a flange portion 55c extending in the radial direction from the shaft portion 55b. The slider 56 having the contact portions 56a and 56b is embedded.
The rotating body 55 is inserted into the hole 51a of the substrate 51 and the hole 54d of the cover 54, and the flange portion 55c is sandwiched between the edge of the hole 51a of the substrate 51 and the edge of the hole 54d of the cover 54. In this state, it is positioned and supported in the vertical direction, and is rotatably attached to the substrate 51 and the cover 54.
When the rotating body 55 is attached, the contact portion 56a comes into contact with the current collector, and the contact portion 56b comes into contact with the resistor and slides to output an electrical signal with a variable voltage value. It is supposed to be.
[0005]
[Problems to be solved by the invention]
However, in the conventional rotary electric component, the positioning of the rotating body 55 in the vertical direction is performed with the flange portion 55 c sandwiched between the substrate 51 and the cover 54. By the way, when the diameter of the hole 55a through which the operation shaft K is inserted is maintained at a predetermined value and the entire component is reduced in the radial direction, the substrate 51 is provided with a resistor, a current collector, and the like. It is desirable to maintain a constant value for the width and spacing of the substrate due to problems such as performance, and it is difficult to reduce the outer shape of the substrate 51, and thus it is difficult to reduce the radial dimension of the entire component. There was a problem. Further, while maintaining the overall size of the parts, also possible to increase the diameter of the hole 51a, similarly difficult, if made to correspond to a large operating shaft K of diameter, it is inevitable to increase the hole 51a, the entire component is There was a problem of getting bigger.
[0006]
The present invention has been made in view of such problems, and by positioning the rotating body in the vertical direction at a place other than the flange portion, a rotary electric component that is small in the radial direction is provided. An object of the present invention is to provide a rotary electric component that can enlarge the hole 51a of the substrate 51 while avoiding an increase in size .
[0007]
[Means for Solving the Problems]
As a first means for solving the above-mentioned problem, the rotary electric component of the present invention has a plate-like substrate having a through-hole penetrating vertically, and a shaft provided with a fitting hole into which an operation shaft can be fitted. A rotating body that is guided by the through hole and rotates to output an electrical signal, and the through hole of the substrate includes first and second holes having different diameters, 1, and a stepped portion formed between the second hole, the substrate has a ring-shaped protruding portion formed to protrude downward from the stepped portion, the second hole is the The rotation is provided by being located in the inner cylindrical portion of the projecting portion, having a smaller diameter than the first hole, and the shaft portion being inserted into the first hole and contacting the stepped portion. The body was positioned in the vertical direction, and the rotating body was configured to rotate using the first hole as a guide.
[0008]
As a second solution, the insertion hole of the rotating body of the rotary electric component of the present invention is configured to have a smaller diameter than the second hole.
[0010]
As a third solution, a rounded portion is provided at the outer peripheral corner of the shaft portion located at the step portion of the rotary electric component of the present invention.
[0011]
As a fourth solution, the rotary electric component of the present invention is provided with a cover that covers the substrate and forms a storage portion for storing the rotating body, and the cover protrudes toward the storage portion. The rotating body has a plate-like portion extending in the radial direction of the shaft portion, and the convex portion is always in contact with the vicinity of the outer peripheral edge of the surface of the plate-like portion facing the cover. It was set as the composition.
[0012]
Further, as a fifth solution, the substrate of the rotary electric component of the present invention is provided with a resistor, the slider is provided with a slider, and the resistor is rotated by rotating the rotor. The slider is configured to slide on the body.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 is a perspective view of a rotary electric component of the present invention, FIG. 2 is a bottom view of the rotary electric component of the present invention, and FIG. 3 is a rotary electric component of the present invention. 4 is a side view of the component, FIG. 4 is a cross-sectional view of the main part of the rotary electric component of the present invention, and FIG. 5 is a top view of the substrate of the rotary electric component of the present invention.
[0014]
The rotary electric part of the present invention will be described with reference to FIGS. 1 to 5. A base body 1 made of a synthetic resin molded product is provided at the center and has a through hole 1 a penetrating the upper surface 1 b and the lower surface 1 c. The lower surface 1c side has a projecting portion 1d that forms a ring-shaped ring projecting downward from the peripheral portion of the through hole 1a, and the through hole 1a has a first hole 1e that opens to the upper surface 1b side, and a first hole 1e and a second hole 1g communicating with each other via a step portion 1f. The diameter of the second hole 1g is smaller than that of the first hole 1e. That is, the protruding portion 1d is formed so as to protrude downward from the step portion 1f, and the second hole 1g is located at the inner cylinder portion of the protruding portion 1d. Further, the corner 1h of the step portion 1f and the boundary between the lower surface 1c and the projection 1d are not narrow so that the flow of the synthetic resin becomes smooth when the base body 1 is injection-molded. In order to ensure proper strength, it is chamfered and rounded. Further, protrusions 1k are formed at two corners on the lower surface.
[0015]
The plurality of terminals 2 and 3 are made of a metal material, and the terminals 2 and 3 are embedded and attached to the base 1, and one end portion projects outward from the side of the base 1 to form terminal portions 2 a and 3 a. Further, the other end portion is exposed from the upper surface 1b of the base 1, and exposed portions 2b and 3b are formed.
[0016]
A current collector 4 obtained by firing a paste in which a good conductive material such as silver is dispersed in a binder resin is formed on the upper surface 1b of the base 1, and is a circle provided around the opening of the first hole 1e. It is configured in an annular shape, and is connected to the exposed portion 2b of the terminal 2 within the range of the annular width A.
[0017]
The resistor 5 is formed on the upper surface 1b of the base body 1 and is formed in an arc shape provided on the outer periphery of the annular current collector 4, and both end portions 5a thereof are arranged close to each other.
[0018]
The lead-out portion 6 including a good conductive material such as silver is formed on the upper surface 1 b of the base 1, and is formed with a curved portion 6 a that is curved along the outer shape of the resistor 5, and an end portion 5 a of the resistor 5. It has the edge part 6b connected to the lower part, and the connection part 6c connected to the exposed part 3b of the terminal 3. FIG.
[0019]
And since the electrical power collector 4 is not a metal plate, the scraping of the contact piece 8a mentioned later can be suppressed, and the lifetime of the slider 8 can be lengthened. Further, an exposed portion 2b of the terminal 2 is formed at a position opposite to the end portion 5a of the resistor 5 with the through hole 1a interposed therebetween.
[0020]
The rotating body 7 made of a synthetic resin molded product has a cylindrical shaft portion 7a and a disk-shaped plate-like portion 7b formed extending in the radial direction from the shaft portion 7a. A non-circular insertion hole 7c through which an operation shaft 11 to be described later can be inserted is provided at the center. Further, the outer peripheral corner portion of the lower end portion 7d of the shaft portion 7a is chamfered to form a rounded portion 7e. The slider 8 is made of a metal plate, has contact pieces 8 a and 8 b, is embedded in the shaft portion 7 a and the plate-like portion 7 b of the rotating body 7, and is integrated with the rotating body 7.
[0021]
The rotating body 7 having such a configuration is positioned in the vertical direction by the shaft portion 7a being inserted into the first hole 1e and the end portion 7d of the shaft portion 7a contacting the stepped portion 1f. It is attached so as to rotate with the first hole 1e as a guide. One contact piece 8 a of the slider 8 slides on the current collector 4, and the other contact piece 8 b slides on the resistor 5. The contact piece 8a slides on the current collector 4 excluding the exposed portion 2b, that is, in the range of the sliding locus S1, and the contact piece 8b moves on the resistor 5 in the range of the sliding locus S2. The resistance value is varied between the terminals 2 and 3 by sliding, and an electric signal is output.
[0022]
The insertion hole 7c of the rotating body 7 has a slightly smaller diameter than the second hole 1g. Further, since the round portion 7e is formed on the shaft portion 7a of the rotating body 7, the rotating body 7 is attached without any play since it is in contact with the rounded corner portion 1h without any gap. The rotation surface is also parallel to the radial direction so that stable rotation can be obtained.
[0023]
Further, the cover 9 made of a synthetic resin molded product has a cup shape, has a flat wall 9a having a hole 9d in the center, and a side wall 9b extending perpendicularly from the outer peripheral edge of the flat wall 9a. Two projecting protrusions 9e, which are ring-shaped protrusions formed downward from the inner wall surface of the wall 9a, are arranged concentrically. Such a cover 9 is attached to the base body 1 by snapping a locking portion 9c, and in the storage part 10 formed with the base body 1, a rotating body 7, a slider 8, and a resistor body 5 are provided. The current collector 4 is housed. When the cover 9 is attached, the top of the shaft portion 7a of the rotating body 7 is located in the hole 9d of the cover 9 and is flush with the flat wall 9a. Further, the convex portion 9e is always in contact with the surface of the plate-like portion 7b of the rotating body 7 facing the cover 9, that is, in the vicinity of the outer peripheral edge on the upper surface side, and is stably supported so that the rotating body 7 does not wobble. Yes.
[0024]
The rotating electrical component of the present invention has the above-described configuration. Next, the mounting state and operation will be described. The rotating electrical component of the present invention includes a total of three protrusions 1d and a pair of protrusions 1k. Positioning projections are inserted into three through holes formed in a printed circuit board (not shown) to determine the arrangement. Then, referring to FIG. 1, the non-circular portion 11 a of the operation shaft 11 is inserted into the insertion hole 7 c of the rotating body 7 and reaches the second hole 1 g, whereby the operation shaft 11 is fixed and the operation shaft 11 is fixed. By rotating 11, the rotating body 7 rotates in conjunction with each other, and an electric signal as a variable output voltage is output.
[0025]
At this time, since the diameter of the fitting hole 7c is slightly smaller than the diameter of the second hole 1g, the operating shaft 11 is in a strong fitting state at the fitting hole 7c and is loosely fitted with the second hole 1g. Thus, since the rotational force of the operating shaft 11 is transmitted only to the rotating body 7, the rotating body 7 rotates smoothly and the positional deviation of the rotating electrical component does not occur. Further, since the protruding portion 1d into which the operation shaft 11 is inserted serves as the positioning of the base body 1, the rotating body 7 is positioned more directly than when positioning with only the protrusion 1k located away from the center. Therefore, the positional accuracy of the rotating body 7 can be improved. Thus, since the positional accuracy of the rotating body 7 is increased, the center of the rotating body 7 and the center of the operation shaft 11 can be matched with high accuracy. Further, since the protruding portion 1d is formed from the lower surface 1c and the thickness of the resin portion below the step portion 1f is increased, the step portion 1f is weighted by the end portion 7d when the operating shaft 11 is inserted. Even if it adds, the danger that the corner | angular part 1h will be damaged or a crack will be reduced.
[0026]
Further, since the rotating body 7 is in contact with the corner portion 1h of the step portion 1f without a gap by the rounded portion 7e, there is no backlash in the mounting, and the rotating body 7 rotates stably and a stable output is obtained. Further, even when the rotating body 7 rotates, since the convex portion 9e of the cover 9 is in contact with the vicinity of the outer peripheral edge of the upper surface of the plate-like portion 7b, the surface is stable on a surface parallel to the radial direction of the shaft portion 7a. Rotates and stable output is obtained.
[0027]
The rotating electrical component of the present invention has the above-described configuration and operates, but it is needless to say that the projecting portion 1d has a ring-shaped ring. However, it may be a hexagonal, octagonal or other polygonal ring, or may be formed by dividing the protruding portion into a plurality of rings and arranging a plurality of ridges to form a ring. Moreover, although the convex part 9e was provided in the cover 9, this convex part may be provided in the rotary body 7, and the point is that the positioning to the upper direction of the rotary body 7 of an axial direction is essential. Although the convex portion 9e has been described as being formed from a convex line that forms a ring-shaped ring, it may be formed from a convex line that forms a polygonal ring, or the convex line 9e may be divided into a plurality of rings. A plurality of them may be arranged so as to form
[0028]
In the embodiments, the present invention has been described with reference to an example in which the present invention is applied to a variable resistor. However, a switch pattern may be provided in place of the resistor 5 and applied to a rotary switch.
[0029]
【The invention's effect】
The rotating electrical component of the present invention includes a substrate having a through hole and a rotating body that has a shaft portion and outputs an electric signal by being guided by the through hole and rotating. The second hole has a smaller diameter than the first hole, the shaft part is inserted into the first hole, and the step part has Since the rotary body is positioned in the vertical direction by abutting, and the rotary body is configured to rotate with the first hole as a guide, the rotary body can be positioned in the vertical direction at the shaft portion. Since no part is required, a rotary electric component that is small in the radial direction can be provided. In addition, since the first hole can be enlarged while avoiding an increase in size of the entire component, it is possible to cope with an operation shaft having a large diameter without increasing the size of the entire component.
[0030]
In addition, since the insertion hole of the rotating body of the rotating electrical component of the present invention has a smaller diameter than the second hole, the operation shaft is strongly fitted into the insertion hole, and the operation shaft is connected to the second hole. Therefore, the rotational force of the operating shaft can be transmitted only to the rotating body, a stable operation can be obtained, and a highly reliable rotating electrical component can be provided.
[0031]
Further, the substrate of the rotating electrical component of the present invention has a ring-shaped projecting portion formed to project downward from the stepped portion, and the second hole is located in the inner cylinder portion of the projecting portion. For this reason, when the operating shaft is inserted, the center of the rotating body and the operating shaft can be easily determined, so that the operating shaft can be inserted with high accuracy. Moreover, since the thickness below a step part increases with a protrusion part, intensity | strength improves and quality can be improved.
[0032]
In addition, since the outer peripheral corner portion of the shaft portion located at the step portion of the rotating electrical component of the present invention is provided with a rounded portion, the shaft portion is in contact with the step portion without any gap, so that the shaft portion is stably provided. Since the rotating body is held and rotates stably, a highly reliable rotating electrical component can be provided.
[0033]
Further, the rotary electric component of the present invention is provided with a cover, and the cover is provided with a convex portion protruding toward the storage portion, the rotating body has a plate-like portion, and the cover of the plate-like portion Since the convex portion is always in contact with the vicinity of the outer peripheral edge of the opposing surface, the rotating body is stably held on the surface orthogonal to the shaft portion and rotates, so that the rotating electrical component has high reliability. Can be provided.
[0034]
The substrate of the rotating electrical component of the present invention is provided with a resistor, and the rotor is provided with a slider, and the slider slides on the resistor when the rotor rotates. Therefore, the present invention can be suitably applied to a variable resistor.
[Brief description of the drawings]
FIG. 1 is a perspective view of a rotating electrical component of the present invention. FIG. 2 is a bottom view of the rotating electrical component of the present invention. FIG. 3 is a side view of the rotating electrical component of the present invention. FIG. 5 is a top view of a substrate of a rotary electric component of the present invention. FIG. 6 is a bottom view of a conventional rotary electric component. FIG. 7 is a main portion of a conventional rotary electric component. Sectional view [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Board | substrate 1a Through-hole 1b Upper surface 1c Lower surface 1d Projection part 1e 1st hole 1f Step part 1g 2nd hole 1h Corner | angular part 1k Protrusion 2 Terminal 2a Terminal part 2b Exposed part 3 Terminal 3a Terminal part 3b Exposed part 4 Current collector 5 Resistor 6 Drawer 6a Curved part 6b End part 6c Connection part 7 Rotating body 7a Shaft part 7b Plate-like part 7c Insertion hole 7d End part 7e Round part 8 Slider 8a Contact piece 8b Contact piece 9 Cover 9a Flat wall 9b Side wall 9c Locking part 9d Hole 9e Protruding part 10 Storage part 11 Operation axis A Width S1, S2 Sliding locus

Claims (5)

It has a plate-like substrate having a through-hole penetrating vertically, and a shaft portion having a fitting hole into which an operation shaft can be fitted, and an electrical signal is output by rotating while being guided by the through-hole. With a rotating body,
The through hole of the substrate has first and second holes having different diameters, and a step portion formed between the first and second holes, and the substrate is provided below the step portion. The second hole is located at the inner cylinder part of the protrusion, has a smaller diameter than the first hole, and the shaft part has The rotary body is positioned in the vertical direction by being inserted into the first hole and in contact with the stepped portion, and the rotary body is rotated with the first hole as a guide. Rotating electrical parts characterized by   The rotary electric component according to claim 1, wherein the insertion hole of the rotating body has a smaller diameter than the second hole. The rotating electrical component according to claim 1 or 2, wherein a rounded portion is provided at an outer peripheral corner portion of the shaft portion located at the stepped portion . A cover that covers the substrate and forms a storage portion that stores the rotating body is provided. The cover is provided with a protruding portion that protrudes toward the storage portion, and the rotating body extends in a radial direction of the shaft portion. The rotary mold according to any one of claims 1 to 3, wherein the rotating part has a plate-like part, and the convex part is always in contact with the vicinity of the outer peripheral edge of the surface of the plate-like part facing the cover. Electrical component. The substrate is provided with a resistor, and the rotor is provided with a slider, and the slider slides on the resistor as the rotor rotates. Item 5. The rotating electrical component according to any one of Items 1 to 4.

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