JPS5841604B2 - Switch manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a highly productive and low-cost method for manufacturing a switch called a key switch, which is applicable to an electronic tuner section of a color television, an electronic cash register, an electronic desktop calculator, etc. Regarding.

An important point for this type of switch is how to reduce manufacturing costs, but the conventional manufacturing method is to make the movable contact plate and fixed contact plate separately by insert molding, and then overlap them. Welded and fixed using ultrasonic waves,
The next method was to incorporate it into a separately provided switch box and secure it to form the whole structure.

Therefore, in this manufacturing method, the number of parts is large, the assembly process is complicated, and there are limits to cost reduction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a manufacturing method capable of manufacturing a switch having high productivity and high reliability with a contact portion having an airtight structure.

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

First, as shown in FIG. 1, a movable contact plate 1, an insulating and heat-sensitive adhesive film 2, and a fixed contact plate 3 are each pressed into a hoop shape using a pilot.

The movable contact plate 1 is provided with a spherical protrusion 11 (protruding upward in the figure) in the center thereof, and a contact plating part is formed on the back surface of the protrusion 11.

When this protrusion 11 is pushed from above, it suddenly (snap-like) dents when a certain force is reached.

Further, an end portion 12 for welding a terminal wire, which will be described later, is formed at the end portion.

A pilot hole 13 is provided in the hoop-shaped edge.

A through hole 21 is provided in the center of the insulating and heat-sensitive adhesive film 2, which is punched out using a press.

A recess 22 is provided at the end (this will be described later).

Further, a pilot hole 23 is provided at the edge.

The fixed contact plate 3 has a protrusion 31 that protrudes spherically (upward in the figure) at its center.

A contact plated portion is formed on the surface of this protrusion 31.

A welding end 32 for welding a terminal wire is formed at the end of the fixed contact plate 3.

A pilot hole 33 is provided at the edge.

Further, a recess 34 (described later) is provided at the end.

The hoop-shaped movable contact plate 1, insulation/heat-sensitive adhesive film 2, and fixed contact plate 3 are superimposed on the same pilot and hot-pressed.

Then, the heat-sensitive adhesive of the film 2 is activated, and the movable contact plate 1, the insulating heat-sensitive adhesive film 2, and the fixed contact plate 3 are bonded and integrated.

After that, other members (movable contact plate 1
Then, unnecessary parts such as the parts connected to the edges of the insulating and heat-sensitive adhesive film 2) are cut off.

In this way, the edge of the fixed contact plate 3 is used as a carrier for transportation.

Next, as shown in FIG. 2, the switch box 4 is integrally molded from synthetic resin so that the peripheral ends of the three integrated members are embedded.

This switch box 4 has upper and lower holes 41, 42 (5th
(see figure), recesses 43 and 44, and a sliding groove 45 are formed.

The holes 41 and 42 expose the central portions of the movable contact plate 1 and the fixed contact plate 3 to the front and back sides, making it possible to suppress the movable contact plate 1 from the front side.

The sliding groove 45 is for slidably holding the sliding leg portion 62 of the operating shaft 6 shown in FIG.

Next, unnecessary parts such as the edges of the fixed contact plate 3 used as a carrier are cut off, and the switch box 4 is made into individual pieces.

Then, wires 51 and 52 that will become terminals are welded.

The recesses 43 and 44 are used during this welding.

In other words, the welding end 12 of the movable contact plate 1 and the welding end 32 of the fixed contact plate 3 are exposed from these four parts 43 and 44.
A welding electrode is pressed against the

3 is a diagram showing only the positional relationship between the wire 52 and the welding end 32 of the fixed contact plate 3, and FIG. 4 is a diagram showing the positional relationship between the wire 51 and the welding end 12 of the movable contact plate 1. FIG.

As shown in FIG. 4, recesses 34 and 22 are provided in the fixed contact plate 3 and the insulating and heat-sensitive adhesive film 2, and a wire 51 passes through the recesses 34 and 22 for welding the movable contact plate 1. The end 12 can be reached.

Furthermore, the recess 34 provides insulation between the fixed contact plate 3 and the wire 51.

After welding the wires 51 and 52 in this manner, the operating shaft 6 is slidably mounted to complete the switch.

In this switch, when the operating portion 61 of the operating shaft 6 is not pressed, the thickness of the insulating and heat-sensitive adhesive film 2 keeps the movable contact plate 1 and the fixed contact plate 3 apart and out of contact.

When the operation part 61 is pressed down, the protrusion 11 of the movable contact plate 1 gradually becomes deflected, and when it exceeds a certain amount, it snaps into a reverse position and attempts to protrude upwardly and downwardly.

In this way, the movable contact plate 1 and the fixed contact plate 3 come into contact, and the wires 51 and 52 are short-circuited.

As is clear from FIG. 5, the peripheral edge of the integrated movable contact plate 1, insulating heat-sensitive adhesive film 2, and fixed contact plate 3 is embedded in the switch box 40 or resin. The space between the movable contact plate 1 and the fixed contact plate 30 is completely sealed.

Therefore, since the contact portion is in a sealed state, contact reliability is maintained over a long period of time.

As described above with respect to the embodiments, according to the present invention,
Since the movable contact plate and fixed contact plate are temporarily fixed using an insulating adhesive film until the switch box is formed, productivity is increased and automatic assembly is possible.

In addition, in the switch manufactured according to the present invention, a movable contact plate and a fixed contact plate are bonded together with an insulating adhesive film, and then the peripheral edges are embedded in a switch box and integrally molded with synthetic resin to form a contact portion. Since it has a sealed structure, it is possible to maintain the reliability of the contacts over a long period of time.

[Brief explanation of drawings]

1 and 2 are exploded perspective views for explaining each step of an embodiment of the method for manufacturing a switch of the present invention, and FIG.
4 and 4 are schematic perspective views showing mutual positional relationships, and FIG. 5 is a front view showing a cross section of the right half of the completed switch box. DESCRIPTION OF SYMBOLS 1... Movable contact plate, 2... Insulating heat-sensitive adhesive film, 3... Fixed contact plate, 4... Switch box,
51°52...Wire, 6...Operation axis.

Claims (1)

[Claims] 1. After overlapping a movable contact plate with a spherical central protrusion, an insulating adhesive film with a through hole in the center, and a fixed contact plate with a spherical central protrusion, adhere them. The above three parts are integrated, and then a hole is formed in which the peripheral edges of the integrated three parts are embedded in an airtight manner and the central parts of each of the movable contact and the fixed contact plate are exposed on the front side and the back side. 1. A method for manufacturing a switch, comprising integrally molding a switch box from synthetic resin in a manner similar to forming a switch box, and then welding wires that will become terminals to predetermined locations on the movable contact plate and the fixed contact plate, respectively.