JPH043401A - Semifixed variable resistor and manufacture thereof - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a semi-fixed variable resistor, and more particularly to a chip-type semi-fixed variable resistor and a method for manufacturing the same.

[Conventional technology]

FIG. 6 is a side sectional view showing a conventional semi-fixed variable resistor 80 of this type.

As shown in the figure, this semi-fixed variable resistor 80 includes an insulating substrate 81, a slider 83 made of an elastic metal plate and placed on the substrate 81, and a slider 83 made of a metal plate and placed on the substrate 81. Consisting of two collector plates 85 arranged on the back side of the
The cylindrical eyelet 87 provided on the current collector plate 85 is connected to the substrate 8.
1 and a fitting hole 91 provided in the slider 83, and the tip thereof was caulked.

When the slider 83 is rotated in this state, the slider 8
A contact portion 93 provided on an arm portion extending from the outer periphery of the substrate 3 and bent downward slides elastically on a resistor pattern (not shown) provided on the substrate 81, and the resistance value thereof is change.

By the way, when transporting this type of chip type semi-fixed variable resistor 80 to an electronic component, the suction part 95 of the suction device is brought close to the top of the semi-fixed variable resistor 80, and the part is removed by vacuum suction. This is done by attaching the semi-fixed variable resistor 80 to the attracting portion 95.

[Problem to be solved by the invention]

However, in the conventional semi-fixed variable resistor 80, since the central part of the eyelet part 87 is a penetrating hole, when the semi-fixed variable resistor 80 is sucked by the suction part 95, the hole There was a problem in that air was sucked in and the semi-fixed variable resistor 80 could not be sucked properly.

In order to solve this problem, some devices have been constructed in which a tongue piece is provided on the current collecting plate 85 and the tongue piece is bent so as to extend through the hole of the eyelet portion 87 from below.

However, when configured in this way, a gap is created between the hole of the eyelet 87 and the tongue depending on the state of bending of the tongue, and the hole may not be completely straightened. Furthermore, the process of folding the tongue piece is complicated.

The present invention has been made in view of the above-mentioned points, and an object of the present invention is to provide a semi-fixed variable resistor that can reliably and easily fill the eyelet hole of the semi-fixed variable resistor, and a method for manufacturing the same. .

[Means to solve the problem]

In order to solve the above-mentioned problems, the present invention consists of a substrate 3 having a horseshoe-shaped resistor pattern on its upper surface and a through hole 13 formed approximately in the center of the resistor pattern, and a metal plate having a resistor pattern on its outer periphery. A contact portion 15 that slides on the resistor pattern is provided, and a slider 5 is provided with a fitting hole 17 approximately the same size as the through hole 13 of the substrate 3 formed approximately in the center thereof, and a slider 5 is made of a metal plate and is hollow at a predetermined position. The current collecting plate 7 is provided with a cylindrical eyelet 11 erected, and the current collecting plate 7 is provided in the through hole 13 of the substrate 3 and the insertion hole 17 of the slider 5 placed on the substrate 3. In the semi-fixed variable resistor 1 in which the slider 5 is rotatably supported on the substrate 3 by inserting the eyelet 11 of the current collector plate 7 and caulking its tip, the hollow cylinder of the eyelet 11 of the current collecting plate 7 A plate-shaped lid 9 that plastically closes the hollow portion is press-fitted inside.

The present invention also provides a method for press-fitting the lid 9 into the cylindrical hollow part of the eyelet 11 of the current collector plate 7 of the semi-fixed variable resistor, in which the metal plate 45 is placed at a position facing the eyelet 11 of the current collector plate 7. Then, the lid 9 is punched out from the metal plate 45 with a punch 50, the punch 50 is inserted into the hole of the eyelet part 11, and the lid 9 punched out with the punch 50 is fixed in the hole.

[Effect]

With the above configuration, the cylindrical hollow hole of the eyelet part 11 can be connected to the lid 9.
It is definitely marked by. Therefore, when the semi-fixed variable resistor 1 is sucked by the suction section of the suction device, air is not sucked through the hole, and the semi-fixed variable resistor 1 can be reliably sucked into the suction section.

In addition, the lid 9 is press-fitted inside the eyelet 1 using a punch 50.
This can be done in a single step of punching out the metal plate 45 and simultaneously pushing the punch 50 into the upper part of the eyelet 1. This makes the engineering work easier.

〔Example〕

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

FIG. 1 is a diagram showing a semi-fixed variable resistor 1 according to this embodiment, in which (a) is a top view, (b) is a back view, and (c) is a diagram (a). FIG. 2 is a sectional view taken along line A-A.

As shown in the figure, this semi-fixed variable resistor 1 includes a substrate 3, a slider 5 rotatably attached to the surface of the substrate 3, and a current collector plate attached to the back side of the substrate 3. 7 and
It consists of a lid 9 that can be inserted and fixed into a cylindrical eyelet 11 provided on the current collector plate 7.

Each component will be explained below.

The substrate 3 is composed of a substantially square insulating plate, and a through hole 13 is formed in the substantially central portion thereof.

Also, although not shown, a horseshoe-shaped resistor pattern is formed on this substrate 3, both ends of which are connected to conductive patterns 19 and 19, respectively, and terminal patterns 23. It is connected to 23.

The slider 5 is integrally formed of a metal plate, and a contact portion 15 that slides elastically on the resistor pattern formed on the substrate 3 is formed at a portion bent downward from the outer periphery. Further, the central part thereof has a dome shape, and in the center there is a fitting hole 17 having approximately the same dimensions as the through hole 13 of the board 3.
is formed.

The current collector plate 7 is made of a metal plate, and one end thereof serves as a center terminal 25. Further, a hollow cylindrical eyelet 11 is provided upright at a predetermined position of the current collecting plate 7, and the rising portion of the eyelet 11 is formed with a tapered portion a having an appropriate curvature.

The lid 9 is made of a disk-shaped metal plate as shown in FIG. 2(a), and a claw may be provided on the outer periphery of the disk as shown in FIG. 2(b).

Next, a method of assembling this semi-fixed variable resistor 1 will be explained.

The method of inserting and fixing the lid 9 into the eyelet 11 of the current collector plate 7 will be explained with reference to FIGS. 4 and 5.

Here, FIG. 4 is a diagram showing a method of press-fitting the lid 9 into the eyelet 11 of the current collector plate 7, and FIG. 5 is an enlarged sectional view of the main part thereof.

First, as shown in FIG. 4, the outer shapes of the eyelet 11, the center terminal 25, and the current collector plate 7 are sequentially formed by pressing a metal plate 40. Note that the eyelet portion 11 is formed protrudingly on the back side in FIG. 4. Here, the current collector plate 7 is supported by the metal plate 40 by three support parts 41.

Also, at this time, a band-shaped metal plate 4 is placed above this metal plate 40.
5 is arranged, and furthermore, a punch 50 is arranged above it.

When the eyelet 11 of the current collector plate 7 moves directly below the metal plate 45, the punch 50 moves downward to punch out the metal plate 45 into a disk shape.

This punched disk-shaped plate becomes the lid 9.

Then, as shown in FIG. 5, the punch 5o, with the lid 9 attached to its tip, moves further downward and is inserted into the tapered part a of the eyelet part 11 of the current collector plate 7.

Then, when the punch 50 is pulled back upward, the lid 9 is attached to the eyelet 11 in a state where it is firmly fixed to the inner periphery of the eyelet 11.

In addition, before the above engineering process, the metal plate 45 and the eyelet part 11 are
If solder plating or silver plating is applied to the lid 9, when the lid 9 is press-fitted into the inner periphery of the eyelet 11, the plating applied to both will be welded, resulting in an even stronger joint.

Then, the current collector plate 7 with the lid 9 fixed thereon is turned over and the eyelet part 1 is
1 facing upward, and assemble each part of the semi-fixed variable resistor 1 on top of it.

That is, as shown in FIG. 1(c), the substrate 3, ring-shaped washer 27, and slider 5 are stacked in this order on the current collector plate 7, and the slider 5 protrudes upward from the insertion hole 17. Eyelet part 11
Caulk the top edge of the

By cutting the three supporting parts 41 shown in FIG. 4, the semi-fixed variable resistor 1 shown in FIG. 1 is completed.

Note that the washer 27 may be unnecessary in some cases.

As a result, the slider 5 is rotatably supported on the substrate 3, and as its contact portion 15 slides on the resistor pattern, the resistance value between the terminal patterns 23, 23 and the center terminal 25 changes. That's what I do.

Figure 3 shows this semi-fixed variable resistor 1 in the suction section 9 of the suction device.
5 is a diagram illustrating a state in which vacuum suction is applied by the method No. 5.

As shown in the figure, according to the semi-fixed variable resistor 1 according to the present invention, when the suction part 95 of the suction device is approached from above the slider 5, the hole in the eyelet part 11 is closed by the lid 9. Since the semi-fixed variable resistor 1 is peeled off, the semi-fixed variable resistor 1 is easily attracted to the lower surface of the suction part 95.

〔Effect of the invention〕

As described above in detail, the semi-fixed variable resistor and method for manufacturing the same according to the present invention have the following excellent effects.

(1) Since the through hole in the center of the eyelet is covered by the lid, when this semi-fixed variable resistor is suctioned by the suction unit of the suction device, the air will not be sucked out from the hole, and the semi-fixed variable resistor will not be completely suctioned. Resistors can be reliably sucked and transported.

(2) The press-fitting of the lid into the eyelet can be done in one step of punching out a metal plate with a punch and simultaneously pushing the punch into the eyelet, so the press-fitting operation is easy.

[Brief explanation of drawings]

FIG. 1 shows a semi-fixed variable resistor 1 according to an embodiment of the present invention.
2 is a plan view showing the lid 9, FIG. 3 is a view showing the state where the semi-fixed variable resistor 1 is vacuum-suctioned by the suction unit 95 of the suction device, and FIG. 4 is a plan view showing the lid 9. FIG. 5 is an enlarged cross-sectional view of a main part thereof, and FIG. 6 is a side cross-sectional view showing a conventional semi-fixed variable resistor 80. In the figure, 1... semi-fixed variable resistor, 13... through hole,
15... Contact portion, 17... Fitting hole, 3... Board,
5... Slider, 7... Current collector plate, 9... Lid, 11.
...Eyelet portion, 40.45...Metal plate, 50...Punch. Patent applicant Teikoku Tsushin Kogyo Co., Ltd. Agent Patent attorney Takashi Kumagai (1 other person) (Figure 3 (b) Figure 5

Claims (2)

[Claims] (1) A substrate with a horseshoe-shaped resistor pattern on its upper surface and a through hole formed approximately in the center of the resistor pattern, and a contact portion that is made of a metal plate and slides over the resistor pattern at a predetermined portion thereof. A slider having a insertion hole of approximately the same size as the through-hole of the substrate formed approximately in the center thereof, and a current collector plate made of a metal plate and having hollow cylindrical eyelets erected at predetermined positions. Insert the eyelet part of the current collector plate into the through hole of the board and the insertion hole of the slider placed on the board, caulk the tip of the eyelet part, and place the slider on the board. A semi-fixed variable resistor rotatably supported on the current collector plate, characterized in that a plate-shaped lid is press-fitted into the hole in the center of the eyelet of the current collector plate to close the hole. . (2) In the method for manufacturing a semi-fixed variable resistor according to claim (1), the press-fitting of the lid into the hole at the center of the eyelet of the current collector plate involves placing a metal plate at a position opposite to the eyelet of the current collector plate. A semi-fixed variable device characterized in that the process is performed by punching a lid from the metal plate with a punch, inserting the punch into a hole in the eyelet, and press-fitting the lid punched out with the punch into the hole. Method of manufacturing resistors.