JPH0311778Y2 - - Google Patents

Description

[Detailed description of the invention] (a) Industrial application field The present invention relates to an electric switch that becomes conductive when a pressing force is applied to the key top and automatically returns to a non-conductive state when the pressing force is removed. , relates to a push switch with flux countermeasures.

(b) Prior Art Since most of the mounting bases of the parts constituting a push switch are formed by insert molding, there is a limit to the amount of production per hour. Therefore, a push-type switch that is inexpensive and can be mass-produced has been desired.

Fig. 1 is a perspective view showing the push switch of Utility Model Publication No. 56-44260, Fig. 2 a is a sectional view showing the push switch of Fig. 1, and Fig. 2 b is a cross-sectional view of the push switch of Fig. 2 a. It is an enlarged view.

Reference numeral 1 designates a mounting base manufactured by inserting a contact portion 4 and a contact terminal 4a, which form a pair of conductive circuits, into a mold so as to be spaced apart from each other, and molding thermoplastic resin into a box shape. A curved push spring 5 having a reversing function is housed in the recess 2 of the mounting base 1, and a push plate 6 is placed on top of the push spring 5. The push plate 6 is integrally provided at the periphery of the opening of the mounting base 1, as shown in FIG. 2b.
By deforming the plurality of protrusions 10 shown in the figure by heat welding to form the retaining protrusions 10a, upward dislodgement is prevented.

This push spring 5 is in contact with the contact terminal 4a in the recess 2, and when it receives a pressing force on the push plate 6, the push spring 5 deforms downward and comes into contact with the contact part 4, making it conductive. When the pressure is released, the elasticity of the push spring 5 restores the separated state.

However, as mentioned above,
In the push-type switch configured as No. 44260,
Due to the necessity of using the mounting base 1 manufactured by insert molding, the production volume per hour is small, so even if the number of processing molds is increased, the production volume is limited, and as a result, processing and assembly costs increase, There were limits to cost reduction.

(C) Purpose The purpose of the present invention is to provide a low-cost push-type switch that can be easily assembled fully automatically.

(D) Structure The push-type switch according to the present invention includes a base having an arbitrary shape, electrode terminals forming a pair of conductive circuits, double-sided thermal adhesive tape for bonding the base and the electrode terminals, and a roughly shallow cap-shaped base. A conductive snap plate made of an elastic material, a substantially button-shaped key top, an insulating plate for electrically insulating the snap plate and the key top, a spacer for housing the snap plate, the key top, and the insulating plate; It is characterized in that it has a laminated structure in which a double-sided heat-adhesive tape for bonding the spacer and the electrode together and a cover for preventing the key top from coming off are stacked on top of each other.

(e) Embodiment FIG. 3 is an exploded perspective view showing an embodiment of the push-type switch of the present invention, and FIG. 4 is a sectional view of the push-type switch of FIG. 3.

Reference numeral 10 denotes a base, which is formed by punching a piece of stainless steel into a rectangular shape.

Reference numerals 20 and 21 denote double-sided thermal adhesive tapes, which are punched out into a rectangular shape, and the double-sided thermal adhesive tape 21 has a circular hole in the center. Note that the tapes 20, 2
1 has the characteristic that it can be temporarily fixed at room temperature and can be firmly adhesively fixed by heating.

Reference numeral 30 denotes electrode terminals, and electrodes 31 and 32 are each formed by punching out a single metal plate. The electrode 31 is rod-shaped and has a pair of terminal portions 311 and the electrode 31.
2 is formed. The electrode 312 has a keyhole shape,
This electrode 312 portion is made thinner than the electrodes 31 and 32 by press working.
The electrode 32 consists of a substantially rectangular electrode main body 322 and a pair of terminal parts 321 each of which has one side extending in the form of a band. ing.

Reference numeral 40 denotes a spacer having a rectangular shape with a circular hole in the center, and is formed by punching out a single phenol plate.

Reference numeral 50 denotes a circular snap plate having an approximately shallow cap shape and having a reversing function, and is made of silver cladlin bronze with silver contact portions.

60 is a circular insulating plate. 70 is a key top formed by deep drawing pressing a stainless steel plate into a button shape, and the central part has a protrusion 7 pointing downward.
1, a series of horizontal collars 72 around the periphery, and a knob 73 projecting above a cover 80, which will be described later, at the top.

The cover 80 has arm portions 81 and 82 extending left and right, and a rectangular stainless steel plate, with a circular hole in the center.

All of the above-mentioned components are formed by punching, and are assembled as follows.

A double-sided thermal adhesive tape 20 is attached to the upper part of the base 10, and an electrode 31,
Separate and attach 32 to prevent electrical conduction.

Double-sided thermal adhesive tape 2 is placed on the top of this electrode terminal 30.
The case 1 is formed by attaching the spacer 40 through the spacer 1.

The snap plate 50 is housed in this case 1 so as to be in contact with the electrode 32, but since the electrode 312 is thinner than the electrode 32, the electrode 312
Since the electrode 31 and the electrode 32 are separated from each other, the end of the snap plate 50 does not come into contact with the electrode 31. Note that the key top 70 on the top of this snap plate 50
When a pressing force is applied to the snap plate 50, the snap plate 50 deforms downward and comes into contact with the electrode 312 for electrical conduction. When the pressing force is removed, the snap plate 50 returns to its separated state due to its elasticity.

Next, the key top 70 is placed on top of the snap plate 50 via the insulating plate 60, and the cover 8
0 into the knob 73 of the key top 70 and
1 and 82 are bent to wrap around the base 10, thereby preventing the key top 70 from coming off upward.

Then, the assembled push-type switches are placed in a furnace and heated at a predetermined temperature to harden the double-sided thermal adhesive tapes 20 and 21 and firmly bond and fix the other parts. Note that the heat treatment of the double-sided thermal adhesive tapes 20 and 21 may be performed during assembly.

FIG. 5 is an explanatory diagram schematically showing the electrode terminals of the completed push-type switch.

During soldering during mounting, there is a possibility that flux etc. may enter from the gap A (shown in FIG. 5a) between the electrodes 31 and 32 through the terminal parts 311 and 321 of the electrode terminals 30, but 2
By heating 1, this double-sided thermal adhesive tape 2
The adhesive No. 0,21 penetrates into the gap A and closes the gap, thereby substantially preventing flux and the like from penetrating along the side surfaces of the terminals and eliminating poor contact.

As another example, the electrode 31 and the electrode 32 may be shaped as shown in FIG. You can also do it.

Further, in the above-described embodiment, the electrode 31 and the electrode 32 are arranged with a certain gap between them so that the electrode 31 and the snap plate 50 are not electrically connected to each other.
As another embodiment, contact between the snap plate 50 and the electrode 31 is prevented by reducing the gap and making the portion of the electrode 31 that contacts the snap plate 50 the same thickness as the electrode 312.

In the above-described embodiment, the base 10, spacer 40, and cover 80 are made of stainless steel, phenol, etc., respectively, in a rectangular shape, but the present invention is not limited to this, and may be made of resin or metal as long as it has appropriate strength and heat resistance. Of course, it is possible.

Further, the key top 70 may be made of resin, and in this case, the insulating plate 60 is unnecessary.

(f) Effects This invention is a simple assembly process in which all of the parts are formed by punching and pasted together, so fully automated assembly is easy, increasing production per hour and reducing costs. can be achieved.

Furthermore, it is possible to provide a push-type switch with measures against flux.

[Brief explanation of the drawing]

Figure 1 is a perspective view showing the push switch of Utility Model Publication No. 56-44260, Figure 2a is a sectional view of Figure 1,
FIG. 2b is an enlarged view of arrow A in FIG. 2a, and FIG. 3 is an exploded perspective view showing the push-button switch of the present invention.
FIG. 4 is a sectional view of FIG. 3, and FIG. 5 is an explanatory diagram schematically showing the electrode terminals of the completed push-type switch. 10...Base, 20, 21...Double-sided thermal adhesive tape,
30... Electrode, 40... Spacer, 50... Snap plate, 60... Insulating plate, 70... Key top, 80
…cover.

Claims (1)

[Scope of utility model registration request] A base of an arbitrary shape, an electrode terminal forming a pair of conductive circuits, a double-sided heat-adhesive tape for bonding the base and the electrode terminal, a conductive snap plate made of a roughly shallow cap-shaped elastic body, and a roughly button. a shaped key top; an insulating plate for electrically insulating the snap plate and the key top; a spacer for housing the snap plate, the key top, and the insulating plate; and a double-sided thermal adhesive tape for bonding the spacer and the electrode. , and a cover for preventing the key top from coming off, respectively, are stacked one on top of the other to form a laminated structure.