JPS62162309A - Rotary operating chained electronic parts - 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 the Invention The present invention relates to a rotatably operated multiple electronic component which is mainly used in consumer electronic equipment such as televisions and stereos and which is rotatably operated via an operating shaft.

BACKGROUND ART In recent years, consumer electronic devices have become smaller and more sophisticated, and the electronic components used in these devices are required to be smaller as well, and the mainstream is for them to be tightly mounted on printed circuit boards. The mainstream method for connecting these electronic components to printed circuit boards is to dip the soldered parts into a bath of molten solder.

In this method, the flux is applied to ensure that the solder is applied to the parts to be soldered by passing the flux of Frank's liquid over the surface of the printed circuit board on which the electronic components are attached so that it is in contact with the surface of the printed circuit board. A method of painting is used.

2. Description of the Related Art As an example of a conventional rotary-operable multiple electronic component, a side sectional view and an exploded perspective view of a rotary-operable small double variable resistor are shown in FIG. 5 and FIG. 6.

In the figure, IA and IB are front, side, and rear contact boards made of insulating material, respectively, with two central holes and 2B, and circular resistive element layers 3A and 3B concentric with these as circular fixed contacts.
are arranged on the inner surface, and these three resistive element layers, three
External lead-out terminals 4A and 4B electrically connected to B are led out in parallel from the lower end thereof. These two contact boards I
A and IB are arranged facing each other on a concentric axis with an insulating resin hollow spacer 5 interposed therebetween, and each of these contact boards is made up of one contact board.

In the space formed by 1B and the hollow spacer 5, there is a rotating body 7 made of an insulating material holding movable elastic contacts 6A and 6B on the front and rear sides, respectively, which slide on the front and rear resistance element layers 3A and 3B. Contained.

On the other hand, a front bearing 9 having a pedestal 8 is disposed on the outside of one front contact board, and a rear extension 10' of a rotary operation shaft 1o rotatably supported by this bearing 9 is connected to the rotating body 7. The movable elastic contact 6
A and 6B rotate and slide on the resistive element layers 3A and 3B to form four terminals.

4B, and the resistance value changes.

The bearing 90 pedestal 8 and the front contact board IA.

The hollow spacer 5 and the rear contact board 1B each have two small through holes H8, H,!, at the same position. (5,) I! 3
These two small through holes H8 and H are open.

A connecting paper 11 is passed through each of H9 and HB from the rear, and the leading ends of the connecting paper 11 are tightened to connect these components.

Problems to be Solved by the Invention When connecting the dual variable resistor terminal shown in FIG. 5 above to a printed wiring board, it is necessary to・4B to rear terminal 4
is inserted, and the tip of the terminal protruding from the back side of the board is soldered to the wiring metal foil part 14 of the board to establish electrical continuity.

During this soldering, the step of applying 7 lux to the back side of the printed circuit board to be soldered by the above-mentioned dipping method is carried out as shown in Figure 4. The rising flux flows from the terminals 4A, 4B or the end faces of the contact boards IA, IB to the contact board surface, and in extreme cases, it flows into the resistive element layers 3A, 3.
It may even cause a contact failure between the movable elastic contacts 6A and 6B if the contact is inserted as far as B.

This risk is particularly high in small electronic components because the dimension from the printed circuit board 12 surface to the contact area is small.
Even if the gap between the contact board and the IB is made as small as possible and the connecting paper 11 is used to strongly press the contact, it is difficult to prevent flux from entering due to capillary action.

The present invention realizes a small-sized multiple electronic component that prevents solder flux from penetrating into the electronic component.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention integrally molds contact boards with terminals and spacers at the front and rear of a rotary operation type multiple electronic component using an insulating resin. Each negative side is an opening,
In addition to forming a casing with a bottom, the abutting portions of the opening end surfaces of these two casings are joined with adhesive tape coated with double-sided adhesive.

Function: As mentioned above, the flux that flows through the terminals, etc., and tries to enter the contact area due to capillary action from the joint between the spacer and the contact board, is prevented by sealing the base of the terminal with molded resin and bonding the casing with adhesive tape. This can be prevented by adhering the parts.

Embodiment FIG. 1 and FIG. 2 show a side sectional view and an exploded perspective view of a rotary-operable small double variable resistor as an embodiment of the rotary-operable multiple electronic component of the present invention.

In the figure, 20mm and 20B have a central hole 22A on the bottom.
, 22B and 23 circular resistive element layers concentric therewith,
23B on the inner surface and an external lead-out terminal 24A.
, 24B are led out from the lower end substantially parallel to the bottom surface of the front and rear contact boards 21, and the same front and rear box-shaped casings are formed by insert molding 21B of insulating resin, As mentioned above, the through holes 22 and 22B in the center of the bottom surface and the circular resistance element layers 23 and 23B as circular fixed contacts concentric with these holes are exposed on the inside of the bottom surface, and from the base of the lower resin wall, they are respectively led out to the outside. There are 24 terminals, and 24B is protruding. And these two box-shaped cases 2OA.

In the space formed by abutting the openings of 20B with each other via the adhesive plate 25, there are the circular resistance element layer 23 and the front and rear movable elastic contacts that make sliding contact with the circular resistance element layer 23B, as in the conventional example. 26 people.

A rotating body 27 made of an insulating material and holding 26B is contained therein.

In addition, the rear extension 30' of the operating shaft 3o, which is rotatably supported by the center hole of the bearing 29 with the seat 28, which is disposed on the front part of the front box-shaped housing 20 through the adhesive plate 25, is It passes through 22 through holes of 20 shaped casings, extends to the rear, and is connected to the center hole of the rotating body 27. By rotating the operating section 30'' of this rotary operating shaft 3o,
Movable elastic contacts 26 and 26B are circular resistance element layers 23A
, 23B and the resistance value derived from the terminals 24 and 24B changes as in the conventional example.

Here, both the adhesive plates 26 and 25A are adhesive tapes with double-sided adhesive coated with adhesive B on both the front and back sides of the base material.
The shape of each joint surface (adhesive plate 25 is box-shaped housing 2om, opening end shape of 20B, adhesive plate 26A is bearing seat 2
It is punched into a shape that almost matches the rear end contact surface shape of No. 8), and the front and rear two members are tightly joined.

When joining this adhesive plate 25, align the small holes 32 of this adhesive plate 25 with the two positioning protrusions 31 provided on the opening end surface of the rear box-shaped housing 20B, and then The two small through holes 33 in the opening end face of the housing 2OA are overlapped and the two box-shaped housings 2OA and 20B are pressed against each other, so that they are tightly joined.

Similarly, when joining 25 adhesive plates, the bearing seat 28
Align the two small holes 36 of this adhesive plate 25A with the two positioning protrusions 34 provided on the rear end surface, and then align the through holes 33 on the outside of the bottom of the 20 front box-shaped casings and stack them. , by pressing the bearing seat 28 and the front housing 20 against each other, the two are tightly joined.

After this, the connecting paper 36 is passed from the rear through the small holes provided at the same positions in the rear box-shaped housing 20B, the front box-shaped housing 2OA, and the bearing seat 28, respectively. By tightening the parts, these components are joined together, and the joint between the two adhesive plates 25.25A is also made more complete and strong.

Effects of the Invention The present invention is constructed as described above, and as shown in FIG. Even if the flux that has risen to the top surface of the board flows through the terminals 24 and 24B, the base portions are completely sealed by the molded resin, so that it will not flow into the internal contacts etc. from this portion.

In addition, since the joints of the two box-shaped casings 2OA and 20B and the joint with the bearing seat 28 are tightly joined with double-sided adhesive tape, the box-shaped casings 2OA and 20B
The flux flowing along the lower surface of B will not flow into the interior from these joints due to capillary action.

Although the above example describes a rotatably operated two-unit electronic component, it is easy to create multiple units such as four units, six units, etc. by consecutively combining the box-shaped housings of the present invention.

As described above, the present invention realizes a rotatably operated multiple electronic component that can prevent the harmful effects of flux seepage during soldering, and is therefore extremely valuable.

[Brief explanation of drawings]

Fig. 1 is a side sectional view of one embodiment of the present invention, Fig. 2 is an exploded perspective view of the same, Fig. 3 is a sectional view showing the structure of the adhesive plate, and Fig. 4 is application of solder flux to the printed circuit board. FIG. 6 is a side sectional view showing a conventional example, and FIG. 6 is an exploded perspective view of the same. 20mm, 20B -・-・-Box-shaped housing, 21mm, 2
1B...Contact board, 22mm, 22B...
- Penetration, 23 people. 23B...Circular resistance element layer, 24 people, 24B.
...4.1 :', ;1 child, 25...adhesive board, 26 mu, 2
6B...Movable elastic contact, 27...Rotating body, 28...Seat portion, 29...Bearing, 3
0...Operating axis, 31.34...Protrusion,
32.33.35...small hole, 36...
Connecting chain, 37... Printed circuit board, 38...
・Terminal hole. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure Mimi Yujima

Claims (4)

[Claims] (1) It is formed of insulating resin, has a through hole concentrically in the center of the bottom surface and a circular fixed contact, and is electrically conductive with the fixed contact through a sealing part in a direction substantially parallel to the bottom surface. Two bottomed casings each having an opening on one side have external lead-out terminals that protrude up to , a rotary body made of an insulating material that rotates by rotating an operating shaft protruding from the through hole of the one housing, and has movable elastic contacts on both sides that slide on the circular fixed contact; A rotatably operated multiple electronic component in which a double-sided adhesive adhesive tape having a central hole having a shape that almost matches the end faces of the openings of two housings is interposed between the end faces of the openings of the two housings. (2) a bearing disposed outside one of the casings to rotatably hold the operating shaft connected to the rotating body outside the casing;
The rotation according to claim 1, wherein a double-sided adhesive adhesive tape having a central hole having a shape substantially matching the surface of the abutting portion is interposed between the abutting portion with the one housing. Operated multiple electronic components. (3) A protrusion is provided on one abutting surface of two parts to be joined with an adhesive tape, and a hole or a recess for receiving the protrusion is provided on the other abutting point and the adhesive tape.
or the rotationally operated multiple electronic component according to item 2. (4) The rotary-operable multiple electronic component according to claim 4, wherein the two housings are tightened by connecting studs, connecting plates, etc. in a direction in which the two housings are pressed together.