KR900010948Y1 - Rotary type resistor - Google Patents

Abstract

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Description

Rotary operation type electric parts

1 to 4 illustrate a variable resistor according to an embodiment of the present invention,

1 is a longitudinal sectional view of a variable resistor.

2 is an exploded perspective view thereof

Figure 3a is a bottom view of the sliding seat mounting the sliding piece.

3b is a side view thereof.

4A is a plan view of an insulating substrate on which a supporting plate is mounted.

4b is a side view thereof.

5 is a longitudinal sectional view of a variable resistor according to a conventional example.

6 is a plan view of an insulating substrate provided in the variable resistor thereof.

* Explanation of symbols for main parts of the drawings

11: Slip the support 11a: Uneven portion

12: sliding part 13: insulated substrate

13a: protrusion piece 13b: stopper piece

14: protective support plate 14a: support legs

14b: Mounting Part 15: Axis

15a: snap protrusion 15b: slot

16: first regulatory wall 16a: first wall portion

16b: second wall portion 17: the second regulatory wall

17a: protrusion 19: locking hole

20: current collector 21: first resistor

22: second resistor 20a, 20b, 21a, 21b: lead portion

22: end 25: printed circuit board

The present invention relates to a rotationally operated electrical component capable of changing the resistance value or switching the switch by rotating the actuator.

As a conventional example of this type of rotationally operated electrical component, a rotationally operated variable resistor is taken as an example, and will be described using FIGS. 5 and 6.

FIG. 5 is a longitudinal sectional view of the variable resistor, and FIG. 6 is a plan view of an insulated substrate provided in the variable resistor. In these drawings, 1 is a slide support, 2 is a slide piece, 3 is an insulation board, and 4 is a protection. Support plate 5 is a frame.

The slide holder 1 is made of synthetic resin, and a handle la is formed on the upper surface thereof, and a support shaft 1b is formed at the center and a stopper protrusion 1d at the periphery thereof, respectively. Since the electrical regulation wall 1c constitutes a predetermined clearance (space) between the lower surface of the slide holder 1 and the upper surface of the insulating substrate 3 described later, the lower surface of the slide holder 1 is constructed. The sliding magnet 2 is fixed so that it may be located in this space.

The insulating substrate 3 is made of an insulating material such as phenol resin or glass epoxy resin, and the hole 3a through which the above-described axis 1b is inserted is provided in the center thereof. As is apparent from FIG. 6, on the surface of the insulator 3, a current collector 6 made of carbon ink or the like and a resistor 7 are formed to be printed in an annular shape inwardly around the hole 3a described above. It is.

In addition, leads 6a and 7b made of silver ink or the like extend from one of the current collector 6 and the resistor 7 toward one edge of the insulating substrate 3, respectively. The terminal 8 of a metal plate is clamped in the hole at one edge of the c), and is electrically connected to the leads 6a and 7a. In addition, in FIG. 6, the broken line shows the overcoat layer 9 which becomes an insulating material, and this overcoat layer 9 coats each said lead 6a and 7a, and is formed on the insulating board 3 It is.

The protective support plate 4 is formed by bending a metal plate, and is attached to the lower surface of the insulating substrate 3 described above by the frame 5 described later.

On one opposite side portion of the protective support plate 4, a protruding periphery piece 4a of short length is formed on the other opposite side portion, and the long limb 4b is bent downward.

The frame 5 is formed by molding a metal plate, and the upper surface is formed with a shaft portion 5a for supporting the above-described handle la, and a part of the main surface is a stopper bending portion capable of engaging with the above-described protrusion 1d. (5b) is formed. Although not shown, a plurality of mounting legs are vertically provided in the lower part of the frame 5, and the frame 5 is insulated by bending these mounting legs along the lower surface of the protective support plate 4 described above. The board | substrate 3 and the protective support plate 4 are integrally piled up from the top, and the one part of the slide holder 1 is rotatably received and supported in the frame 5.

The variable resistor thus constructed is soldered to and mounted on the printed circuit board 10 indicated by the double-dotted line in FIG. That is, both protruding pull pieces 4a of the protective support plate 4 are projected on the upper surface of the printed circuit board 10 to be brought into contact with each other, and the support legs 4b are not shown in the mounting holes of the printed board 10. And the terminal is temporarily soldered onto the printed circuit board 10, and then each terminal 8 is soldered to a soldering land (not shown) on the bottom surface of the printed circuit board 10. As shown in FIG.

In the variable resistor mounted on the printed board 10 as described above, when the handle 1a is rotated while holding the finger 1a with the finger or the like, the sliding member 2 interlocks with the current collector 6 and the resistor 7 respectively. Rotating and sliding, the resistance value change corresponding to the sliding contact position between the sliding member 2, the current collector 6, and the resistor 7 is taken out from each terminal 8;

In this case, the restricting wall 1c formed on the periphery of the slide support 1 rotates and slides outside of the resistor 7 on the insulating substrate to cross each of the leads 6a and 7a. Since 6a and 7a are covered by the overcoat layer 9 with large mechanical strength, peeling of these leads 6a and 7a is prevented. In addition, the rotation angle of the handle la is regulated to a predetermined range by the protrusion 1d of the slide support 1 sticking to the bent part 5b of the frame 5.

However, in the prior art structured as described above, the sliding support 1 is assembled into the insulating substrate 3 and then assembled by a variable resistor by bending the mounting leg of the frame 5 coated on the sliding support. Therefore, not only is it troublesome to require bending processing in the assembling work, but also it is not necessary to protrude and form the handle la from the frame 5 in order to pivot the slide support 1, and thus, in particular, Miniaturization of the thickness direction was difficult.

It is therefore an object of the present invention to solve the problems of the prior art, to provide a rotationally operated electrical component that is easy to assemble and excellent in dustproofness.

In order to achieve the above object, the present invention includes an insulating substrate having an annular conductive pattern formed on its surface, and a sliding support on which a sliding piece is fixedly attached to a lower surface thereof, and rotating the sliding support to operate the sliding support described above. In a rotationally operated electrical component which obtains a predetermined electrical signal by changing the sliding contact position between the piece and the conductive pattern, the sliding support is fitted with a locking hole drilled through the insulating substrate in the center of the lower surface of the slide support. The slit-shaped support shaft is formed vertically, and is slid to the lower surface of the insulated substrate, which is located outside of the insulated substrate described above and the annular first restricting wall which is in contact with the surface of the insulated substrate described above. A semicircular annular first regulatory wall having protruding pieces in contact with each other is provided concentrically with respect to the aforementioned axis, and the aforementioned sliding element is provided with the aforementioned axis and the first restriction wall. That is fixedly attached thereto by feature.

According to the above means, it is possible to assemble the sliding support with the sliding element and the insulating substrate on which the conductive pattern is formed by simply inserting the supporting shaft perpendicularly to the sliding support into the locking hole of the insulating substrate.

In the rotary operation type electrical component assembled as described above, the first regulating wall of the sliding member rests on the outer side of the conductive pattern on the upper surface of the insulating substrate, and the protruding pieces of the second regulating wall rotate on the lower surface of the insulating substrate to rotate and slide. Therefore, the rotation operation can be performed smoothly, and dust is prevented from adhering to the conductive pattern.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 to 4 are related to one embodiment of the present invention, in which FIG. 1 is a longitudinal cross-sectional view of a variable resistor, FIG. 2 is an exploded perspective view thereof, and FIGS. 3 (a) and (b) are a bottom view of the seat support and 4A and 4B are plan views and side views of an insulating substrate, 11 is a support for a seat, 12 is a slide piece, 13 is an insulation board, and 14 is a protective support plate.

The slide holder (11) of the synthetic resin material is formed in a disc shape cut off a part. The uneven part 11a is formed in the main surface except this cut part. At the center of the lower surface of the slide support 11, a support shaft 15 having a snap projection 15a whose tip is gradually narrowed is installed vertically, and the support shaft 15 has three slits extending in the axial direction. 15b) is formed. In addition, on the lower surface of the slide support 11, the first regulating wall 16 having an annular shape and the second regulating wall 17 having a semicircular arc maintain a predetermined distance with the center of the above-described support shaft 15 as a whole. It is formed.

As clearly shown in Figs. 3 (a) and (b), the above-described first regulatory wall 16 is not a complete circle but a first arc that extends in a semicircular arc at a constant radius about the axis 15. It becomes the wall part 16a and the 2nd wall part 16b extended at the both ends of this 1st wall part 16a gradually, and the radius is small, and the height dimension of the 2nd wall part 16b is the 1st wall part 16a. It is set as small as compared with the height dimension of. On the other hand, the protruding piece 17a is integrally formed in the lower end center position of the 2nd regulation wall 17, and this protruding piece 17a extends in the direction of the axis 15 mentioned above.

Moreover, the pin 18 is vertically provided in the inside of the 1st regulation wall 16 in the lower surface of the slide support 11 mentioned above, and the slide piece 12 fixes this pin 18 by clamping it. It is attached to the lower surface of the slide support (11) so as to be fixed. A plurality of contact portions 12 are formed in the sliding member 12 so as to cross the above-described support shaft 15, and these slide in contact with an electrical contact and a resistor formed on an insulating substrate described later. .

The insulating substrate 13 is made of an insulating material such as a phenol resin or a glass epoxy resin, and the insulating substrate 13 has a locking hole 19 into which the support shaft 15 of the slide support 11 described above is inserted. It is drilled and installed. As shown in FIG. 4A, the surface of the insulating substrate 13 has a predetermined angular range around the annular current collector 20 and the engagement hole 19 surrounding the engagement hole 19 described above. The first and second resistors 21 and 22 extending in annular form are printed, respectively, and one end of both resistors 21.22 is connected via a lead portion 20a which is drawn from a part of the dust collector 20. It is. In addition, at one edge of the insulating substrate 13, three terminals 23 corresponding to the current collector 20 and the first and second resistors 21 and 22 described above are fitted and fixed to the holes. These terminals 23, the current collector 20 described above, and the first and second resistors 21, 22 are connected via lead portions 20b, 21a, 22a, respectively. In addition, protruding pieces 13a are drilled on side surfaces of the insulating substrate 13 that face each other, and the vicinity of these protruding pieces 13a is a stopper surface for restricting the rotation angle of the slide holder 11 described above. (13b),

The protective support plate 14 is made of a thin metal plate, and the supporting legs 14b extending downward are bent on one side facing each other, and the mounting pieces 14b extending upward on the other side facing each other. This bend is formed, and a hole 14 is drilled in the center position. As shown in Figure 4 (b). The protective support plate 14 overlaps the lower surface of the above-described insulating substrate 13, and then bends both mounting pieces 4b inwardly along the upper surface of the above-described protruding piece 13a, so that the insulating substrate 13 It is attached integrally to the lower surface.

Next, the assembly process of the said Example is demonstrated.

First, holes 23 are formed in the insulating substrate 13 on which the current collector 20, the first and second resistors 21 and 22, and the lead portions 20a, 20b, 21a, and 22b are formed. 4a (a) and (b) by bending and attaching the mounting piece 14b of the protective support plate 14 to the protruding piece 13a of the insulating substrate 13 after being fixedly attached thereto. As shown in the figure, the protective support plate 14 is attached to the lower surface of the insulating substrate 13 in advance. On the other hand, the pin 18 of the sliding support 11 is fitted and fixed, and as shown in Figs. 3 (a) and (b), the sliding piece ( 12) is installed. Next, the protruding pieces 17a of the slide holder 11 are covered with the periphery of the lower surface of the above-described insulating substrate 13, and the latching portion 15 is used as the point to insulate the support shaft 15 of the slide holder 11. It is inserted into the locking hole 19 of the board | substrate 13, and is inserted. In this case, since the support shaft 15 is easily deformed in the radial direction by the slots 15b, the snap protrusions 15a of the support shaft 15 can be easily caught on the lower surface of the insulating substrate 13. In this way, the variable resistor shown in FIG. 1 is obtained.

The variable resistor configured as described above is assembled as described above, and then soldered to the printed circuit board 25 shown by the two-dot chain line in FIG. In this case, using the support legs 14a of the protective support plate 14, with the variable resistor temporarily stopped on the printed board 25, each terminal 23 is not shown on the bottom of the printed board 25. It is soldered to the soldering land.

In addition, since the variable resistor in the embodiment can be assembled as one-touch as is apparent from the foregoing description, the soldering work is performed in the state of the semi-finished product before assembling the slide holder 11 into the insulating substrate 13. You can do it. That is, after soldering and attaching the terminal 23 to the print engine 25 using the support legs 14a of the protective support plate 14 mounted on the insulating substrate 13, the slide support 11 as described above. By inserting the support shaft 25 into the locking hole 19 of the insulating substrate 13 on which the soldering process is completed, it can be assembled as a variable resistor mounted on the printed circuit board 25. In this case, since the terminal 23 is soldered to the printed circuit board 25 in the state of the semi-finished product before assembling and inserting the slide holder 11, there is no possibility that the solvent adheres to the slide holder 11 in the soldering process. At the same time, there is less risk that the solvent raises the support leg 14a of the protective support plate 14 and reaches the surface of the insulating substrate 13, thereby preventing contact failure due to the adhesion of the solvent.

As described above, in the variable resistor mounted on the printed circuit board 25, when the concave-convex portion 11a of the slide holder 11 is gripped with a finger or the like, the slide member 12 is connected to the current collector. Since 20 slides and slides on the first and second resistors 21 and 22, respectively, a resistance change corresponding to the sliding contact positions thereof is transmitted through the lead portions 20b, 21a, and 22a. It is taken out to each terminal 23. In this case, the sliding support 11 moves along the lower periphery of the lower surface of the insulating substrate 13 while the protruding piece 17a of the second regulating wall 17 moves, and the first wall portion of the first regulating wall 16 is moved. When the 16a slides on the upper surface of the insulating substrate 13, the rotation is operated without causing excessive force on the insulating substrate 13, and both ends of the second restricting wall 17 in the circumferential direction thereof are insulated. The rotation angle is regulated by adhering to the stopper surface 13b of 13). In addition, the first regulatory wall 16 that rotates in conjunction with the sliding member support 11 has a shape in which the height dimension of the second wall portion 16 protrudes at a shorter height than the first wall portion 16a as described above. Since the first wall portion 16a slides on the insulating substrate 13 in accordance with the trajectory A indicated by the dashed-dotted line in FIG. 4A, the second wall portion 16b There is no fear that the lead portions 20b, 21a, 22a are disconnected by the first restricting wall 16 by rotating while maintaining a small distance from the surface of the insulating substrate 13. In addition, since the second wall portion 16b is formed to have a diameter smaller than that of the first wall portion 16a, the second wall portion 16b is allowed to approach each of the terminals 23 in the direction of the locking hole 19 within a range that does not collide with the wall portion 16a. As a result, the variable resistor can be miniaturized as much as possible.

In addition, the current collector 20 and the first and second resistors 21 and 22 on the insulating substrate 13 are minutely spaced, but are substantially surrounded by the first regulatory wall 16. Intrusion of foreign matter is prevented by the first regulation wall 16, and a variable resistor having high dustproofness is realized.

In the above embodiment, the variable resistor is described as an example of the rotary operation type electric component, but it goes without saying that the present invention can be applied to other rotary operation type electric parts such as a rotary switch.

As described above, according to the present invention, it is possible to assemble a smoothly rotating electrical part by a simple operation of inserting a support shaft vertically provided on the sliding support into the locking hole of the insulating board, and at the same time, the first restriction is made. The dust is prevented from adhering to the conductive pattern by the wall, thereby providing a rotationally operated electrical component that is easy to assemble and excellent in dustproofness.

Claims (1)

An insulating substrate having an annular conductive pattern formed on its surface and a sliding support fixed to the sliding piece on the lower surface thereof are rotated to change the sliding contact between the sliding piece and the conductive pattern. Thus, in the rotationally operated electrical component that obtains a predetermined electrical signal, a slot-shaped support shaft is inserted vertically into the center of the lower surface of the sliding member and fitted with a locking hole provided in the insulating substrate. The supporting shaft includes a first annular first regulating wall sliding on and in contact with the surface of the insulating substrate, and a second circular annular second regulating wall having a protruding piece that is located outside the insulating substrate and is in contact with the bottom surface of the insulating substrate. Rotating operation, characterized in that installed in the concentric circle with respect to the sliding element is fixedly attached between the support shaft and the first regulatory wall. Electrical parts.