JPS5826129B2 - push button switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a push button switch, and an object of the present invention is to provide a push button switch that is easy to assemble and ensures reliable switch operation.

As a conventional push button switch, there is one shown in FIG. 1, for example.

1 is a case with a pair of wire-shaped fixed contacts 2, 2□ at the bottom.
, 22.

Reference numeral 3 designates a conductive rubber contact, which includes a negative movable contact portion 3a, a conical elastic portion 3b, and a support portion 3c.

4 is a push button, and when pressed downward, the elastic part 3 of the rubber contact 3
b is elastically displaced so that the movable contact portion 3a simultaneously contacts the pair of fixed contacts 2, 21, 22 and closes them.

However, according to the above-mentioned conventional example, since the - movable contact portion 3a must simultaneously contact the pair of fixed contacts 21 and 2□ as described above, when the push button 4 is pushed diagonally, the movable contact portion 3a There is a drawback that even if 3a contacts only one of the fixed contacts 2 or contacts them at the same time, the contact tends to become unstable and a contact failure is likely to occur.

Another conventional example is shown in FIG.

The substrate 6 of the case 5 has a pair of L-shaped fixed liquid points 7°7, .
7□ was planted.

The rubber contact 8 has the same shape as the rubber contact 3 but is arranged upside down, and has first and second contact portions 8a.
, 8b and an elastic portion 8c, and the negative contact portion 8a is normally closed with the negative fixed contact 7□.

9 is a push button, and when pressed downward, other ring-shaped contact part 8b or 1
Pair of fixed contacts 7□.

Simultaneously contact T2 to close it.

However, according to the above-mentioned other conventional example, although the contact part 8a and the fixed contact T2 are normally closed, the contact part 8b is in simultaneous contact with the above-mentioned contacts T0 and 7□. In addition, the center contact part 8a, which has a small contact area, contacts the fixed contact 72, and the ring-shaped contact part 8b, which has a small contact area, slides later and contacts the contact 72.
There is a drawback that the contact efficiency is not good due to the unstable contact with the fixed contacts 7 and 7□.
When inserting and soldering the protrusions on the lower surface of the board 6 in □ and 7□ to other boards, soldering flux may enter the joint between the case 5 and the board 6 and deteriorate performance, so apply an adhesive seal or the like here in advance. It has the disadvantage that it is troublesome and must be done in advance.

The present invention eliminates the above-mentioned drawbacks, and each embodiment thereof will be described below with reference to the drawings.

3A to 3D are a plan view, a longitudinal sectional front view, a side view, and a bottom view, respectively, of one embodiment of the push button switch according to the present invention.

In the figure, the push button switch is used, for example, in electronic tuning tuners for automobiles, microcomputers, etc., and is generally shown in a case body 11. It consists of a rubber contact 12 and a push button 13.

The structure of the case body 11 will be explained in order of manufacturing steps.
First, as shown in Fig. 4A and B, for example, phosphor bronze P for springs is used.
The entire surface of a board 14 of a predetermined width made of BS is plated with Ni (thickness: approximately 1 μm), and a pair of fixed contacts 15, 15 . .

Au plating only on the part corresponding to 15□ (thickness approx. 0.2
μ) and then press-cut to form, for example, eight sets of fixed contacts 15, 15□, and 15□ into a single piece of material.

The fixed contacts 15□ and 15° have a concentric shape as shown in Fig. 4A and Fig. 5, and the fixed contact 15□ has a stepped portion 15
A is formed.

Next, as shown by the two-dot chain lines in FIG. 4A and B, a resin cylindrical case 16 is insert-molded in the center of each of the fixed contacts 15, 15□, and 15□ of the above-mentioned material. Cut the inner wires 11 and 12 and cut them individually, and then bend the protruding parts at both ends of each fixed contact 15, 15□, 15□,
The individual case bodies 11 shown in FIGS. 3A-D are obtained.

According to the manufacturing method of the case body 11, since a plurality of pieces are integrated and manufactured by insert molding, the fixed contacts 1
5,151° 15□ and the case 16 do not require troublesome assembly work, making manufacturing easy and reducing the number of man-hours.

Each of the fixed contacts 15□, 15□ of the case body 11 is formed into a dogleg-shaped elastic terminal portion 15b by the above-mentioned bending process, and the case 16 is a cylinder with a bottom as shown in FIG. 3B-D. The external bottom of the case has a stepped portion 16a for preventing flux from rising, and a pair of protrusions 16b and 3 for mounting the board.
It has pin holes 16c.

The projecting size of the improving reporter protrusion 16b downward from the bottom surface of the case 16 is set to be smaller than the protruding size of the terminal part 15b, and as will be described later, when the protruding portion 16b is attached to the board 18, the protruding part 16b is attached to the board 18. 18 Does not protrude to the lower surface.

In addition, each pin hole 16c is formed by a pin 17 in which the fixed contact 15□ and the ring-shaped bifurcated portion of the fixed contact 15□ are inserted into the internal mold ( (not shown) to prevent unnecessary displacement due to pressure during molding, and are formed at the extraction marks of each pin 17.

Furthermore, as shown in FIG. 3B and FIG. 5, air escape grooves 16d of a predetermined depth are provided on the internal bottom surface of the case 16 along the gaps between the fixed contacts 15□ and 15□ and along the vertical direction of the inner peripheral surface of the case 16. 16, and a pair of window holes 16e are formed in the upper part of the cylinder wall.

The rubber contact 12 is made of conductive rubber and is integrated with a columnar contact part 12a, a ring-shaped contact part 12b, and a conical elastic part 12c that connects them. 12d and 12ek are provided and have a small width.

This rubber contact 12 is fitted and housed in the case 16, and the ring-shaped contact portion 12b is always in ring-shaped contact with the fixed contact 15°, and the columnar contact portion 12a is in constant ring-shaped contact with the fixed contact 15□.
to face.

The reason why the ring-shaped contact portion 12b of the rubber contact 12 is provided with relief portions 12d and 12e to make it narrower is as follows.
As specifically shown in the figure, the fixed contact 15. A downward punching sag 15b is formed on both sides of the case 16 during press punching, and an R portion 16f is formed at the bottom of the inner periphery of the case 16 due to the radius limit of the corner of the internal mold, thereby preventing poor contact. This is to prevent any negative impact.

That is, as shown by the two-dot chain line in the figure, if the relief portion 12d,
If the rubber contact 12 not included in 12e' is inserted into the case 16, its lower end corner 12f will meet the above-mentioned R part 16f.
It cannot come into contact with the fixed contact 151 due to interference with the fixed contact 151, and even if it does come into contact with the fixed contact 15□, it is likely to cause poor contact due to the sagging portion 15c.

Therefore, as shown by the solid line in the figure, if the ring-shaped contact portion 12b is provided with a relief portion 12dt12e to make it narrower, the contact contact will be good regardless of the hanging portion 15b and the rounded portion 16f, and the rubber contact 12 Case 16 when inserted
Even if dust adhering to the inner wall is scraped off to the bottom surface of the case, it will not have any adverse effects such as poor contact because it will adhere and remain on the R portion 16f, which is unrelated to the contact contact.

Also, considering only the press sagging mentioned above, in order to prevent its negative effects, the width of the cell fixed contact 151 shown in FIG. It is desirable that the

The push button 13 is made of resin, and as shown in FIGS. 7A to 7C, it is integrally molded with a columnar push button part 13a that is substantially concentric with each other and forms a hollow, a cylindrical guide part 13b, and an operating part 13c on the upper surface. , the pushing portion 13a projects downward by a predetermined distance from the guide portion 13b.

The guide portion 13b has a pair of engagement protrusions 13d on both sides,
Furthermore, four vertical grooves 13e are provided at equal positions on the circumference, and together with the hollow shape described above, the structure has elasticity in the direction perpendicular to the axis.

Further, the operating portion 13c has a portion of a 13ft stopper on both sides.

This push button 13 is located inside the case 16 with its guide portion 13b.
The pushing part 13a comes into contact with the columnar contact part 12a of the rubber contact 12, and the pair of engagement convex parts 13d are inserted into the upper edge of each window hole 16e of the case 16, respectively. The elastic portion 12c of the rubber contact 12 is latched at the position where it comes into contact with the force due to the slight elastic force.

When the push button 13 is attached, each engagement protrusion 13d once contacts the upper end of the inner periphery of the case 16, rides on the inner periphery, and finally falls into the window hole 16e.
is easily made possible by elastic displacement in the direction perpendicular to the axis as described above.

When installing and inserting the push button 13, it is not necessarily necessary to match the circumferential angular position of the engagement protrusion 13cl with respect to the window hole 16e before insertion. After reaching different angular positions and the same height position relative to the window hole 16e, the push button 13 may be rotated in a predetermined direction to engage the engaging protrusion 13d into the window hole 16e. .

Furthermore, when removing the push button 13 from the case 16, if you try to pull the push button 13 upwards as shown in FIG. Therefore, in reality, the push button 13 is once rotated in a predetermined direction as shown in FIG.
It can be easily removed by moving it from the inside of the window hole 16e onto the inner periphery of the case 16 due to the elastic displacement, and then pulling it upward in FIG. 3B.

In order to attach the push button switch to another board 18 as shown in FIG. are press-fitted and positioned into the respective holes 18b.

As a result, the dogleg-shaped portion at the lower end of each terminal portion 15b or each hole 18
A protrudes from the lower end, and its locking action positions the push button switch more firmly, completing temporary fixation.

Next, by performing solder dipping, each terminal portion 15b is conductively fixed in a predetermined pattern by the solder 19, respectively.

According to this mounting structure, the push button switch can be positioned with respect to the board 18 by the protruding portion 16b and the terminal portion 15b.
Temporary fixation can be easily performed by the dogleg-shaped portions, making the installation work easier and also improving the accuracy of the installation.

Furthermore, since each protrusion 16b does not protrude from the lower surface of the substrate 18 when attached to the substrate 18, as described above, the protrusion 16b melts and deforms due to solder heat during the soldering process, making it impossible to remove the push button switch from the substrate 18. This problem does not occur, and even if the solder 19 is formed manually, the protrusion 16b does not interfere with the manual operation.

Further, in this case, the soldering flux rising through the holes 18a and 18b is prevented from rising by the case stepped portion 16a and does not reach the window hole 16e, thereby preventing performance deterioration.

Next, the operation of the push button switch having the above structure will be explained using FIG. 3B.

First, the push button 13f: When you operate the operation part 13c and push and slide it downward, the columnar contact part 12 of the rubber contact 12
a is pressed by the pushing part 13a, and is displaced downward with the elastic displacement of the elastic part 12c, and comes into contact with the central fixed contact 15□.

However, since the ring-shaped contact portion 12b of the rubber contact 12 is always in contact with and closed to other fixed contacts 15□, at this time, each fixed contact 15□.

152 conducts through the rubber contact 12 to close the switch.

In this case, the rubber contacts 12 are in ring-shaped contact with the fixed contacts 15□, each having a contact area, by their contact portions 12b, and then apply a predetermined pressing force to the central single fixed contact 152 by their contact portions 12a. Therefore, even if the contact portion 12a contacts at an angle due to sliding play of the push button 13, the switch closing function remains stable without any influence.

Immediately after the columnar contact portion 12a contacts the fixed contact 15□, the stopper portion 13f of the push button 13 contacts the upper end of the case 16 to prevent excessive displacement.

Further, as the push button 13 is pushed, the space inside the rubber contact 12 is contracted, but the air in this space is easily led out to the outside through the escape groove 16d inside the case 16, so that the switch cannot be closed. There will be no inconvenience in the process.

Next, when the pushing force of the push button 13 is released, the rubber contact 1
The second columnar contact portion 12a is displaced upward and returned as its elastic portion 12c returns to its original position, and the push button 13 is moved back to each engagement convex portion 13d.
slides back upward until it comes into contact with each window hole 16 (upper edge).

Thus, the conduction between the fixed contacts 151 and 152 is broken and the switch is opened.

In this case as well, air enters the space in which the rubber contact 12 expands through the relief groove 16d, and the rubber contact 12 is quickly returned to its original position, thereby causing no inconvenience in opening the switch.

In the embodiment described above, the rubber contact 12 in FIG. 3B is not limited to this mounting configuration, but may be installed and inserted upside down as in the case of FIG. The part 12a always contacts and closes the central fixed contact 15□, and when the push button 13 is pressed, the ring-shaped contact part 12b, which is pressed by the guide part 13b, slides downward and contacts the fixed contact 15° to switch. It will be closed.

As described above, according to the push button switch of the present invention, the push button member can be easily fitted from the opening side of the case without being elastically deformed in the axial direction due to the function of the axial groove of the cylindrical portion of the push button member. It is convenient to assemble and disassemble the push button member with one touch because it can be stored together and locked by the functions of the first and second engaging parts provided on the push button member and the case respectively. Therefore, it is possible to make the case cylindrical with a bottom and integrally insert mold the fixed contacts at the bottom of the case, reducing the number of case-related parts, simplifying the configuration and assembly, and simplifying the structure of the fixed contacts. It is convenient because the protruding part from the case can be used as a terminal as it is, and when the terminal is soldered, the soldering flux does not enter into the case due to the insert molding, which prevents performance deterioration. Since the contact part is always closed to the - fixed contact, when the push button is pressed, the other contact parts do not contact one pair of fixed contacts as in the conventional example, but simply contact and close the other - fixed contact. It has the advantage of improving performance by making the closing operation stable and reliable.

[Brief explanation of drawings]

1 and 2 are vertical sectional views of a push button switch and other conventional examples, respectively, and FIGS. 3A to 3 D are a plan view, a longitudinal sectional front view, and a side view of one embodiment of the push button switch according to the present invention, respectively. Figures 4A and 4B are a plan view and side view of parts in the manufacturing process of the push button switch, respectively, and Figure 5 is A-A in Figure 3B.
6 is an enlarged longitudinal sectional view taken along line B-B in FIG. 3B, and FIGS. 7A-C are partially cutaway front views of the push button of the push button switch, respectively. Side view and bottom view, No. 8
The figure is a partially cutaway side view showing the push button switch attached to another board. L5, 16...Case, 2, 20.2□, 1
゜7□, 72. 15, 150.15□・・・・・・
・Fixed contacts, 3, 8, 12, 12'...
Rubber contact, 3a...Movable contact part, 8a, 8b
, 12a, 12b... Contact portion, 3b, 8c, 1
2c...Elastic part, 3c...Supporting part, 4
, 9, 13... Push button, 6, 18... Board, 11... Case body, 12d, 12e...
...Escape part, 13a...Pushing part, 13d.
...Engagement convex portion, 13e...Vertical groove, 13f
...Part of stopper, 15b...Terminal part, 15c...Dragging part, 16e...Window hole, 16f...R part, 19...Solder.

Claims (1)

[Claims] 1. An insulating case which is approximately shaped like a cylinder with a bottom, has a first retaining part at a predetermined position in the axial direction, and has a pair of metal plate-shaped fixed contacts integrally molded at the bottom of the cylinder; A second contact portion is integrally connected via an elastic portion, and the first contact portion is in normally closed contact with the negative fixed contact within the case, and the second contact portion is connected to the other fixed contact within the case. A cylindrical part is integrally formed around a conductive rubber contact member that is housed in a spaced relationship facing a fixed contact, and a pushing part, and the cylindrical part is elastically deformable in a direction perpendicular to the axis by an axial groove thereof. Moreover, it has a second engaging part at a predetermined position, and the first and second engaging parts are fitted and stored in the case from the case opening side with elastic deformation of the cylindrical part.
The rubber contact member is locked by the engagement of the engaging part, and when the pushing part slides, the pushing part pushes the rubber contact member toward the bottom of the case, and the elastic deformation of the elastic part pushes the second contact part. A push-button switch comprising a push-button member brought into contact with the first fixed contact.