KR20000017155A - Push button switch and the method of manufacturing the same - Google Patents

Abstract

PURPOSE: A push button switch and a manufacturing method thereof is provided to maintain a distance between a common contact and a movable contact when operating a push button switch. CONSTITUTION: The push button switch and a manufacturing method thereof comprises: a insulated substrate(12); a fixed contact body(14) with a metal thin film having a central contact(18) fixed to the insulated substrate and a first connection terminal(20) connected to the central contact; a spacer(16) for being installed to the insulated substrate around the central contact; and a movable contact body(28) with a metal thin film having a movable contact(30) covering the central contact and a second connection terminal(32) connected to the movable contact, a predetermined distance being maintained between the central and the movable contacts by facing a lower portion of an outer circumference of the movable contact on the spacer.

Description

Pushbutton Switch and Manufacturing Method {PUSH BUTTON SWITCH AND THE METHOD OF MANUFACTURING THE SAME}

The present invention relates to a thin pushbutton switch, such as a tact switch, in which a movable contact is in contact with and detachably opposed to a fixed contact on an insulating substrate, and a manufacturing method thereof.

6A and 6B are a longitudinal sectional view of a conventional pushbutton switch and a longitudinal cross-sectional view in an operation state thereof, respectively, based on the same drawing, in which the pushbutton switch is provided with an insulating substrate 2 of an insulating thin plate. The side wall 4 which consists of the same insulating material is formed in the peripheral edge. Further, a metal center contact 6 and two cavity contacts 8 are provided in the side wall 4, and their ends are placed on the insulating substrate 2, respectively.

The central contact point 6 and the cavity contact point 8 are both drawing and stepped, and the end of the cavity contact point 8 is placed on the top plate 4a of the side wall 4, and the end part has a side wall. The connecting terminal 9 protruding to the outside of (4) is integrally formed, and is bent downward along the side wall 4, and is formed. In addition, a connection terminal (not shown) is integrally attached to the central contact 6.

Subsequently, the pushbutton switch is provided with a dome-shaped movable contact 10 made of an elastic metal sheet, and the movable contact 10 is fitted to the stepped portions of the respective common contacts 8 in a normal state. They face each other at regular intervals from the central contact (6).

The ceiling sheet 4a of the side wall 4 is provided with a flexible insulating sheet 12 which covers the inside of the side wall 4 so as to surround it, and the insulating sheet 12 is placed on the top plate 4a surface and the joint contact. Adhesion is fixed by bonding to the end of (8).

Next, the operation of the pushbutton switch will be described. When the pushbutton switch is mounted on the printed board, and the insulating sheet 12 and the movable contact 10 are pressed by a finger or the like, the top portion of the movable contact 10 is moved downward. In contact with the center of the central contact point 6, the hollow contact 8 and the central contact point 6 are electrically turned on through the movable contact point 10, and at the same time, the respective contact points 6 and 8 The connection terminals are also connected between the terminals for connection respectively.

Subsequently, when the pressing pressure applied to the insulating sheet 12 is released, the movable contact 10 returns to its original dome shape by an elastic force, and is separated from the center contact 6, and thus, between the cavity contact 8 and the center contact 6. Is turned OFF.

However, in the conventional pushbutton switch, as shown in Fig. 6B, when the insulating sheet 12 and the movable contact 10 are pressed with a finger or the like in the downward direction indicated by the arrow S, the adhesive force and the tension of the insulating sheet 12 are reduced. Thereby, the movable contact 10 may be lifted at the contact portion with the common contact 8 to be spaced apart from the common contact 8. Therefore, there is a problem in that, even though the pushbutton switch has been operated, it is not turned on (conductive) but remains in the OFF (non-conductive) state.

In addition, in order to secure the stroke amount of the center contact 6 and the movable contact 10 of the pushbutton switch, a slight step of several tens of micrometers is formed in each protrusion amount of the center contact 6 and the cavity contact 8, In addition, in order to secure the dimensional accuracy of each protrusion amount, drawing process is performed to each of the center contact 6 and the cavity contact 8, and it is stepped. However, since the center contact 6 and the cavity contact 8 are minute components, especially in a shape requiring a step such as a step shape, the shape is complicated, difficult to draw, and complicated to process.

SUMMARY OF THE INVENTION An object of the present invention has been made in view of the above problems, and in operation of a pushbutton switch, the contact between the contacting contact point and the movable contact point is spaced apart so that disconnection does not occur, and it is easy to process and has high assembly precision. To provide a button switch.

1 is a plan view of a state in which the insulating sheet of the pushbutton switch according to the present invention is removed.

FIG. 2 is a cross-sectional view of the pushbutton switch viewed in the direction of the arrow 2-2 of FIG. 1.

3 is a cross-sectional view of the pushbutton switch viewed in the direction of the arrow 3-3 of FIG.

Figure 4 is a plan view showing a hoop state after press processing in the manufacturing process of the pushbutton switch according to the present invention.

5 is an exploded perspective view of the pushbutton switch in the hoop state of FIG. 4.

6A is a longitudinal cross-sectional view of a conventional pushbutton switch, and FIG. 6B is a longitudinal cross-sectional view of an operation state of a conventional pushbutton switch.

※ Explanation of symbols about main part of drawing ※

12: insulated substrate 14: fixed contact body

16 spacer portion 18 center contact

20: first connection terminal 22: first connection portion

24a, 24b: spacer 26a, 26b: base

28: movable contact body 30: movable contact

32: second connection terminal 34: second connection

36: insulating sheet 52: first hoop material

54: second hoop material 56: third hoop material

As a first solution for solving the above problems, an insulating substrate, a fixed contact body made of a metal sheet made of a central contact fixed to the insulating substrate and a first connection terminal connected to the central contact, and surrounding the central contact A movable contact body made of metal sheet, comprising a spacer provided on the insulated substrate and having a plate thickness thicker than that of the central contact point, a dome-shaped movable contact covering the center contact point, and a second connecting terminal integrally connected to the movable contact point. And a contact between the outer peripheral edge of the movable contact to the spacer so that the center contact and the movable contact are separated by a predetermined distance, and the second connecting terminal of the movable contact body is fixed on the insulating substrate.

In addition, as a second solution for solving the above problems, a first hoop material punched to form a fixed contact body having a center contact and the first connection terminal, a second hoop material punched to form a spacer portion having a spacer; The third hoop material punched out of the movable contact body is sequentially aligned and laminated, and the laminated first, second and third hoop materials are placed between the insulating sheet and the insulating substrate on both sides of the upper and lower sides, and fixed to each other. The unnecessary parts of these first, second and third hoop materials are cut off.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of the pushbutton switch which concerns on this invention is described based on FIG.

1 is a plan view of a pushbutton switch with the insulation sheet removed, FIG. 2 is a cross-sectional view of the pushbutton switch as seen in the direction of the arrow 2-2 of FIG. 1, and FIG. 3 is the arrow direction of the 3-3 line of FIG. This is a cross-sectional view of the pushbutton switch.

As shown in Figs. 1 to 3, 12 is a circular thin and flat insulating substrate, 14 is a fixed contact body made of a metal thin plate, and 16 is a pair of spacer portions made of a metal or resin thin plate.

The fixed contact body 14 has a circular flat central contact 18, a rectangular connecting terminal 20 for soldering this switch to a printed circuit board of a used device (not shown), and a connection therebetween. And a pair of the spacer portions 16 each having a C-shaped flat spacer 24a, 24b surrounding the central contact 18, and each spacer 24a, 24b. It consists of the bases 26a and 26b which are integrally connected to the same plate | board thickness, The plate | board thickness of the spacer part 16 is formed thicker than that of the stationary contact body 14, and the difference of the plate | board thickness is the stroke amount of this switch. It is part of.

As shown in Fig. 2, the center contact 18 is fixed to the fixed contact body 14 on the substrate 12 so as to be located at the center of the insulating substrate 12 by an adhesive or the like (not shown). 18), the C-shaped portions of the spacers 24a and 24b are arranged to face toward the center contact 18 at predetermined intervals. And the spacer part 16 which has these spacers 24a and 24b is attached and fixed by the adhesive etc. on the insulating board 12 similarly to the stationary contact body 14. As shown in FIG.

28 is a movable contact body made of a thin metal plate, a circular dome-shaped movable contact 30 having elasticity, and a connecting terminal 32 having a rectangular shape for soldering this switch to a printed circuit board of a used device (not shown). And a connecting portion 34 connecting them. And this connection part 34 corresponds to the common contact 8 in the conventional pushbutton switch, and integrates the movable contact 30 and the connection terminal 32. As shown in FIG.

The movable contact 30 covers the center contact 18 and the spacers 24a and 24b, and is placed so that the lower portion of the outer circumference of the movable contact 30 abuts on the C-shaped spacers 24a and 24b. Moreover, the flexible circular insulating sheet 36 which apply | coated the adhesive agent to the lower surface is coat | covered so that the whole switch which covers this switch from the upper side of the movable contact 30 may be coat | covered, and this insulating sheet 36 is covered by the upper surface of the movable contact 30, An adhesive is fixed on the connection terminals 20 and 32 of the fixed contact body 14 and the movable contact body 28 and the bases 26a and 26b of the spacer part 16.

The pushbutton switch according to the present invention configured as described above operates as follows. That is, when the insulating sheet 36 and the movable contact 30 shown in Figs. The predetermined stroke 휜 movable contact 30 is reversed with the seat 36 to be in contact with the center contact 18. Thereby, the connecting terminal 20 connected to the central contact 18 and the connecting terminal 32 connected to the movable contact 30 and the connecting portion 34 are electrically connected to each other and are turned OFF (non-conductive) to ON. ) Is switched to the state.

In this ON state, when the pressing operation force such as a finger is released, the movable contact 30 returns to its original circular shape by its elastic return force, and the insulating sheet 36 is lifted up, and at the same time, the movable contact 30 ) Is separated from the center contact 18, the connection terminals 20 and 32 are electrically OFF.

Thus, the center contact 18 and the connection terminal 20 integrally formed with the same metal thin plate, and the movable contact 30 and the connection terminal 32 integrally formed with the same metal thin plate, operate ON this switch. Since the movable contact 30 and the connecting terminal 32 are always connected via the connecting portion 34 at the time, and the connecting terminal 32 is soldered directly to the printed board at the movable contact 30, the distance between the contacts Stable connection can be maintained without generating

In addition, the stroke amount of this switch is formed by the difference in the plate thickness of the fixed contact body 14 and the spacer part 16, and the difference between the top part of the movable contact 30 and its peripheral part, that is, the contact step difference. Since it can be comprised by the thin plate which eliminated the drawing process with respect to the same center contact 6 and the common contact 8, this switch can be manufactured simply. Moreover, since the fixed contact body 14 and the spacer part 16 are flat thin plate shape, the plate thickness difference which becomes a part of stroke amount of this switch can be formed easily and precisely.

Next, the assembly method of the pushbutton switch configured as follows will be briefly described with reference to FIGS. 4 and 5.

Here, FIG. 4 is a top view which shows a part of hoop material after press work in the manufacturing process of the pushbutton switch which concerns on this description, and FIG. 5 is an exploded perspective view of the pushbutton switch in the hoop state of FIG.

4 and 5, 52 is a first hoop material punched with the fixed contact body 14, 54 is a second hoop material punched with the spacer portion 16, and 56 is a movable contact body 28 is punched out. Third hoop material.

The fixed contact body 14 and the spacer part 16 are formed by press-processing (punching) these hoop materials 52 and 54 to a predetermined shape with the press molding machine which is not shown, respectively, as can be seen from drawing. .

Similarly to the movable contact body 28, the third hoop material 56 is pressed (punched) to form the movable contact 30 and the like, and then the movable contact 30 is further processed into a dome shape. Is formed.

The 60a, 60b, 60c, and 60d are four pilot pins of the automatic assembler which support these hoop materials 52, 54, 56 and align them at predetermined positions.

Holes 52a, 52b, 54a, 54b, 56a, 56b formed at equal intervals in the longitudinal direction of the band are formed at both edges of the first, second, and third hoop materials 52, 54, 56, respectively. . Then, the holes 52a to 56d are used to precisely align at the time of press working by a press molding machine, and each hoop material 52, 54, 56 is processed into a predetermined shape.

In the automatic assembly, the first hoop material 52 is automatically transported on the pilot pins 60a and 60b of the automatic assembly machine, and the pilot pins 60a and 60b are formed in the holes 52a and 52b of the first hoop material 52. ) Are inserted from below, and the pins 60a and 60b are protruded from the holes 52a and 52b to align the first hoop material 52 to a predetermined position.

Then, similarly, the second hoop material 54 is automatically transported on the pilot pins 60c and 60d, and the pins 60c and 60d are respectively inserted into the holes 54a and 54b of the second hoop material 54 from below. The pins 60c and 60d are protruded from the holes 54a and 54b to align the second hoop material 54.

Subsequently, the third hoop material 56 is automatically transported again on the pilot pins 60c and 60d in which the second hoop material 54 is aligned and supported in advance, so that the holes 56a and 56b of the third hoop material 56 are provided. These pilot pins 60c and 60d are inserted into the pins, and the pins 60c and 60d are protruded from the holes 56a and 56b, and the third hoop material 56 is stacked on the second hoop material 54 so as to be aligned. Let's do it. At this time, the holes 54a and 54b and the holes 56a and 56b are overlapped and fitted to the pilot pins 60c and 60d, respectively.

After assembling in this manner, the insulating substrate 12 and the insulating sheet 36, each of which is coated with adhesive on one surface of the three hoop materials 52, 54, 56, are covered with each other as if covering the entire switch viewed from the up-down direction. Place and fix.

Finally, four places of the dotted lines A, B, C, and D shown in FIG. 4 are cut to complete this pushbutton switch.

Since the self-assembler is stacked and assembled on the pilot pins 60a to 60d based on the holes 52a, 52b, 54a, 54b, 56a and 56b of the hoop materials 52, 54 and 56, the positions are precisely positioned. Aligned assembly can be carried out. In addition, since the position alignment by the automatic assembler can be ensured, a material such as a metal thin plate having a thinner plate thickness can be used, and the thickness can be further improved.

Then, using the first hoop material 52 punched by the fixed contact body 14 and the third hoop material 56 punched by the movable contact body 28 as the same material, the fixed contact points are formed on one hoop material, respectively. When the sieve 14 and the movable contact body 28 are punched out, two molds, the press die and the above-described die for the spacer portion 16, are sufficient. Therefore, the mold cost can be reduced or the production time of the die is reduced. Can shorten.

As described above, the pushbutton switch according to the present invention includes an insulating substrate, a fixed contact body made of a thin metal plate composed of a central contact fixed to the insulating substrate, and a first connection terminal connected to the central contact, and surrounding the central contact. A movable contact body made of metal sheet, comprising a spacer provided on the insulating substrate and having a plate thickness thicker than that of the central contact point, a dome-shaped movable contact covering the center contact point, and a second connecting terminal integrally connected to the movable contact point. A contact between the outer peripheral edge of the movable contact to the spacer, the center contact and the movable contact separated from each other by a predetermined distance, and the second contact terminal of the movable contact body is fixed on the insulating substrate. Since the connecting terminal is molded integrally, this pushbutton switch does not generate a contact gap when the movable contact is pressed. Certainly it can be in ON (conductive) state. Further, by simply fixing the center contact and the spacer made of a thin metal plate on the insulating substrate as it is, the plate thickness difference between the center contact and the spacer can be precisely formed as the contact step, and the drawing processing of the contact is not required.

In addition, a first hoop material punched to form a fixed contact body having a center contact and a first connection terminal, a second hoop material punched to form a spacer portion having a spacer, and a third hoop material punched to form a movable contact body Are sequentially aligned and stacked, and the laminated first, second and third hoop materials are placed between the insulating sheet and the insulating substrate on both sides of the upper and lower sides, and fixed to each other, and the first, second and third hoops are formed. By cutting away the unnecessary parts of the ash, the position alignment of each of the first, second and third hoop materials is ensured, and a thinner plate thickness can be used for the pushbutton switch to further reduce the thickness. can do.

Claims (2)

Insulation board, A metal sheet fixed contact body comprising a center contact fixed to the insulating substrate and a first connection terminal connected to the center contact; A spacer which is provided on the insulating substrate so as to surround the center contact and has a plate thickness thicker than that of the center contact; A movable contact body made of a metal sheet comprising a dome-shaped movable contact covering the center contact and a second connecting terminal integrally connected to the movable contact; While contacting the outer peripheral edge portion of the movable contact to the spacer to separate the center contact and the movable contact at a constant distance, And a second connection terminal of the movable contact body on the insulating substrate. A first hoop material formed by punching a fixed contact body having a center contact and a first connecting terminal, A second hoop material formed by punching a spacer portion having a spacer; The third hoop material formed by punching the movable contact body is sequentially stacked and laminated, and the laminated first, second and third hoop materials are placed between the insulating sheet and the insulating substrate on both sides of the upper and lower sides, and fixed to each other. , A method of manufacturing a pushbutton switch, wherein the unnecessary portions of these first, second and third hoop materials are cut off.