JPS617607A - Method of producing small-sized electric part - 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 [Technical Field] The present invention relates to a method for manufacturing small electrical components in which a plurality of semi-fixed variable resistors, sliding variable resistors, or Swiss-type variable resistors are manufactured in succession.

[Technical background and problems with conventional technology] Small electrical components such as variable resistors and switches mounted on printed circuit boards of various electronic devices can be manufactured at low cost due to simplified structures and improved mass productivity. It is required that

A semi-fixed variable resistor is an example of a small electric component that is desired to be made smaller and lower in cost.

Conventionally, the process of manufacturing this semi-fixed variable resistor is as follows:
A board made of a resin laminate or ceramic is processed into a predetermined shape, a circuit body such as a resistor and electrodes is formed on this board by printing, and then contacts and operating bodies that come into sliding contact with the resistor are assembled. There is.

However, in this manufacturing method, the assembly work must be performed one by one, making the manufacturing process complicated and labor-intensive, resulting in high manufacturing costs.

In addition, recently, contacts and terminals are continuously formed on a metal band-shaped plate material by punching, and resin is outsert molded onto the contacts and terminals to form an operating body. Consideration is being given to attaching the operating body and the like to the board.

According to this manufacturing method, contacts, terminals, operating bodies, and the like can be continuously supplied using a strip-like plate material, which has the advantage of simplifying the manufacturing process. However, even if this method is adopted, the insulating substrates must be manufactured separately, and resistors and the like must be printed on each substrate. The individual production of this board is extremely complicated;
This has a major impact on increasing costs.

[Object of the present invention]

The present invention has been made by focusing on the above-mentioned conventional problems, and it forms an insulating substrate through a continuous process, simplifies the manufacturing process of the board and the printing process of the circuit body, and achieves a small size at low cost. It is an object of the present invention to provide a method for manufacturing small electrical components that can be configured into electrical components.

[Configuration of the present invention]

The method of manufacturing a small electric component according to the present invention involves forming a plurality of circuit bodies at regular intervals on the surface of a strip-shaped plate made of an insulating material, and then forming a circuit body surrounding each of the circuit bodies and connecting the circuit bodies to the circuit body. A plurality of resin casings that hold the terminals are fixed onto the strip, and then each member, such as the contact that contacts the circuit body and the operating body of this contact, is attached to the strip. It is characterized by assembling each part to the circuit body forming part, further separating the part where the circuit body is formed from the strip plate material, and making the electrical components independent using the separated plate material as a board. The mass productivity is improved by forming the casing and assembling various parts onto the continuously formed substrates.

[Example of the present invention]

Embodiments of the present invention will be described below with reference to the drawings.

The drawings sequentially show the manufacturing process of a semi-fixed variable resistor as an example of a small electric component.

FIG. 1 is a plan view of the strip-shaped plate material 1, and FIG. 2 is a side view thereof.

The strip-shaped plate material 1 is made of an insulating material such as synthetic resin and is thin and strip-shaped. Feed holes 11 are bored at a constant pitch at one end of the strip-like plate material 1. This feed hole 11 allows the belt-shaped plate material 1 to be automatically fed. A plurality of substrates 12 are formed at a predetermined pitch on this strip-shaped plate material l. Cutouts 13a, 13b, and 13c are formed around the substrate 12, and the substrate 12 is supported by the strip-shaped plate l by connection pieces 14a and 14b formed at the boundaries of the cutouts 13a to 13c. It turns out. A shaft hole 12a is formed in the center of the board 12, and a pair of terminal support holes 12b are formed in the ends of the board 12. Furthermore, as shown in FIG. 2, a groove 1a is formed on the back surface of the substrate 1. This groove 1a is formed at the boundary between each substrate 12, and the groove 1a portion is formed thin so that the strip-shaped plate material 1 is easily deformed, and winding of the strip-shaped plate material 1 is facilitated. . Incidentally, if the band-shaped plate material 1 is formed of a thin film-like material, this groove 1a is unnecessary.

First, in the first step, a resistor 21 and an electrode 2 as a circuit body are mounted on each of the plurality of substrates 12 formed on the strip-shaped plate l.
form 2. The resistor 21 is printed and molded from carbon or the like, and is formed in a semicircular arc shape centered on the shaft hole 12a. Further, the electrode 22 is formed of silver paste or the like, and the resistor 21
is connected to both ends of the In addition, in the process of forming this circuit body, printing etc. are performed while automatically feeding the strip plate material 1 using the feed hole 11. The same applies to the following steps.

Next, in the step shown in FIG. 3, a terminal 311 is connected to the electrode 22. This terminal 31 is fixed to the electrode 22 by soldering or a conductive adhesive. or terminal support hole 1
2b may be fixed by caulking using a grommet or the like.

After attaching the terminal 31, resin is applied to the strip-shaped plate 1 seven times, and the casing 40 is molded integrally with the strip-shaped plate l.

This process is illustrated in FIG. 4 (plan view), FIG. 5 (view in direction of arrow V), and FIG. 6 (cross-sectional view along Vl-VI). At this time, the resin passes through the notches 13a, 13b, and 13c and extends to the back side of the strip plate material 16, and the lower part of the casing 40 becomes a holding part 41 that holds the strip plate material 1 from above and below, and the F part is A cylindrical case 42 surrounds the resistor 21. At the same time, a hole 41a is formed in the center of the holding part 41 (see Fig. 6).
. This hole 41a is continuous with the shaft hole 12a of the substrate 12. Further, the base of the terminal 31 is fixed by a holding part 41,
In addition, the tip portion of the terminal 31 protrudes outward from the housing 40 .

Next, various members are assembled onto the substrate 12. The state after assembly is shown in FIG. 7 (plan view), FIG. 8 (view from the ■ arrow), and FIG. 9 (IX-IX sectional view).

Reference numeral 51 is an intermediate terminal. A shaft 52 is inserted through the metal fitting 51 a integrated with the intermediate terminal 51 , and the shaft 52 is inserted into the hole 42 a of the casing 40 , with its tip protruding from the shaft hole 12 a of the board 12 in the E direction.

Further, an operating body 53 is attached to the upper side of the strip-shaped plate 1.

This operating body 53 is made of resin, and has a metal plate 5 at its lower end.
4 and a contactor 55 are fixedly installed (see FIG. 9). This operating body 53 also serves as a cover, and the surrounding area is the housing 4.
It is installed to cover the cylindrical case 42 of No. 0. The tip 52a of the shaft 52 is inserted into the center of the metal plate 54, and the operating body 5
It is caulked in the hole 53a of No.3. As a result, the operating body 5
3 is rotatable together with the shaft 52 and the contact 55.

At this Tg, the semi-fixed variable resistor is completed.

When a screwdriver or the like is inserted into the cross recess 53b formed on the top surface of the operating body 53 or the groove 52b at the lower end of the shaft 52 and rotated, the contact 55 is removed together with the shaft 52 and the operating body 53.
rotates and slides the resistor 21). When set to a predetermined rotational position, the contact 55 is connected via the metal plate 54 and the shaft 52.
A resistance value is set between the terminal 31 and the intermediate terminal 51 which is electrically connected to the terminal 31 .

In addition, when mounting the above semi-fixed variable resistor on a printed circuit board or the like, the connecting pieces 14a and 14b of the strip-shaped plate material 1 are cut, and each semi-fixed variable resistor is separated from the strip-shaped plate material 1. This separation process and the mounting process on a printed circuit board can also be performed continuously using an automatic machine. Further, this semi-fixed variable resistor is shipped and stored in the connected state shown in FIG. 7. Alternatively, it may be shipped or stocked in the state shown in FIG. 4, and each member such as the contactor 55 may be assembled immediately before the mounting process.

In the illustrated embodiment, a semi-fixed variable resistor is shown as an example of the small electric component, but a small switch or the like may be used as another example. In this case, the circuit body becomes an electrode. Alternatively, a sliding variable resistor may be used. In this case, the substrate 21 and the casing 40 are formed into a rectangular shape.

C. Effects of the present invention] As described in H below, according to the present invention, the following effects can be achieved.

(1) Boards for electrical components are formed by connecting them with strip-shaped plates, circuit elements such as resistors are formed on these boards by printing, and the casing is formed by performing outsert molding on the strip-shaped plates. After that, members such as contacts and operating bodies are assembled to the strip-shaped plate material, so assembly can be performed in a continuous process until the end, reducing the number of processes and reducing costs.

(2) Since the circuit boards can be formed by connecting them using strip-shaped plate materials and printing circuit bodies can be carried out in this connected state, it is possible to form the circuit boards separately as in the past and print circuit bodies on each. Compared to the previous method, the manufacturing cost of the board can be significantly reduced.

[Brief explanation of drawings]

The drawings show a method of manufacturing a semi-fixed variable resistor as an embodiment of the present invention, in which Fig. 1 is a plan view of a band-shaped plate, Fig. 2 is a side view thereof, and Fig. 3 shows terminals attached to the band-shaped plate. FIG. 4 is a plan view showing the state in which the casing is integrally formed with the strip plate material, FIG. 5 is a view taken in the direction of the V arrow in FIG. VI sectional view, FIG. 7 is a plan view showing a state in which various members are assembled, and FIG. 8 is a view taken in the direction of the ■ arrow in FIG. 7. FIG. 9 is a sectional view taken along line IX-IX in FIG. 7. l...Strip plate material, 21.22...Circuit body, 31...
・Terminal, 40... Housing, 51... Intermediate terminal, 52.
...shaft, 53... operating body, 55... contactor. Applicant Alps Electric Co., Ltd. Agent Patent Attorney Teruo Nozaki Figure 1 Figure 3

Claims (1)

[Claims] A plurality of sets of circuit bodies are formed at regular intervals on the surface of a strip plate made of an insulating material, and a plurality of resins surround each of the circuit bodies and hold terminals connected to the circuit bodies. A casing made of aluminum is fixed onto the strip-shaped body, and then a contact that contacts the circuit body and an operating body of this contact are respectively assembled to the circuit-body forming portion of the strip-shaped plate material, and a circuit is formed from the strip-shaped plate material. A method for manufacturing a small electrical component, which comprises separating a portion in which a body is formed and making an electrical component independent using the separated plate material as a substrate.