JPH0646035Y2 - switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a push button type switch used for a keyboard and the like.

<Prior Art> FIG. 5 shows an example of a general push button type switch structure used for a keyboard for inputting information such as a word processor and a computer.

The switch 1 includes a case 2, a switch element 3 installed in the case 2, an operating member (stem) 4 reciprocally attached to the case 2, and a coil for returning the operating member 4 upward. The spring 5, the pressing spring 6,
It is composed of a leaf spring 7 or the like that gives a click feeling.

The case 2 is composed of a lower case 8 and an upper case 9, and a leaf spring 7 is formed on the inner surface of the upper case 9 with a pressing plate 10 interposed therebetween.
The distal end of the leaf spring 7 is extended in the reciprocating range of the operating member 4 and is in contact with the lower portion of the operating member 4. On the other hand, the switch element 3 is attached to the lower case 8 along the inner surface of the upper case 9. One end of a pressing spring 6 is supported on the upper part of the switch element 3, and the other end of the pressing spring 6 serves as a free end to come into contact with the operating member 7 and reciprocate the operating member 7 to reciprocate the switching element. 3 is operated. Further, the pressing spring 6 is provided with a protrusion 11 on the surface facing the switch element 3. Further, a coil spring 5 is interposed between the lower case 8 and the operating member 4, and the spring 5 biases the operating member 4 upward. Then, the operation member 4 is pushed up at the return position where the stopper 12 provided on the operation member 4 is brought into contact with the inner surface of the top wall of the upper case 9 by this biasing force. A key top 13 is mounted on the upper portion of the operating member 4 protruding from the upper case 9.

In the switch 1 thus configured, when the operating member 4 is pushed down against the bias of the coil spring 5, the leaf spring 7 and the pressing spring 6 are elastically deformed outward and pushed out. And it is given a click feeling by leaf spring 7,
Further, the surface of the switch element 3 is pushed by the protrusion 11 of the pressing spring 6, and the contact point in the switch element 3 is turned on. Next, when the pressing force applied to the operating member 4 is removed from this state, the operating member 4 is returned to the initial position by the urging of the coil spring 5. As a result, the leaf spring 7 and the pressing spring 6 self-return inward, and the pressing force on the switch element 3 is released,
The switch element 3 is turned off again.

By the way, the conventional structure of the switch element 3 is a base in which the fixed terminal 15 provided with the fixed contact 15a exposed on the surface and the fixed terminal 16 having no fixed contact are molded.
14 and the fixed contact 15a with a slight distance from the fixed terminal 1
6 is a movable contact member 17 fixed by crimping via a riveting (not shown), etc., and a base on the outside of this movable contact member 17.
It is composed of an insulating film material 18 and the like fixed to 14 by crimping.

The movable contact member 17, as shown as a single item in FIG. 6, is formed as a strip-shaped small piece of a thin plate metal material having a spring property.
The hole 17a provided at one end is caulked and fixed to the fixed terminal 16, and the free end 17b on the other end side is attached to the front surface of the fixed contact 15a so as to be opposed thereto.

<Problems to be solved by the invention> The movable contact member 17 fixed by crimping in this manner causes a warp deformation when crimped with an extremely large force applied to the crimped portion, and is fixed to the free end 17b. The gap between the contact 15a and the contact 15a varies. Therefore, there is a problem that the product accuracy is not stable.

The present invention has been made in view of the above problems, and an object thereof is to provide a switch having a structure capable of stabilizing product accuracy.

<Means for Solving the Problems> In order to achieve the above object, the present invention provides a case, a switch element arranged in the case, and a reciprocatingly movably attached to the case urged in a return direction. And a pressing spring for operating the switch element by reciprocating movement of the operating member by contacting the operating member with one end fixed to the case and the other end being a free end. The switch element includes a resin base, a fixed contact member fixed to the base, and a movable piece portion that is arranged to face the fixed contact member and is brought into contact with the fixed contact member by the pressing spring. And a movable contact member having a base portion formed of a thin metal material that is caulked and fixed to the fixed terminal on the base side, and the base portion and the movable piece portion of the movable contact member are flat with a narrow portion sandwiched therebetween. Integrated into a substantially U-shape It is formed and configured.

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

FIG. 1 and FIG. 2 show the essential structure of a switch according to an embodiment of the present invention.
The structure is the same except that the structure of the switch element 3 in the switch 1 shown in the figure is omitted. Therefore, the members designated by the same reference numerals as those of the switch shown in FIG. 5 are the same as the members shown in FIG.

That is, the switch element 30 according to the present invention, which corresponds to the switch element 3 shown in FIG. 5, has a base 31, fixed terminals 32 and 3.
3, the movable contact member 34, the film sheet 35, and the like.

The base 31 is made of a resin material, and a recess 36 is formed on one side surface of the base 31 which is deepened in order toward the central portion. Further, the fixed terminal 32 and the fixed terminal 33 are molded and integrated into the base 31, and the contact portion 32a of the fixed terminal 32 is exposed in the central portion of the recess 36. Further, holes 38 penetrating the front and back are provided corresponding to the portions where the movable contact member 34 is fixed by crimping.

The fixed terminal 32 and the fixed terminal 33 are integrated as a band-shaped fixed contact member 39 before being molded on the base 31, as shown in FIG. 4 before being molded, and correspond to a plurality of switch elements 30. The portion to be connected is connected by the connecting portion 39a and is continuously provided. Further, a contact portion 32a and a terminal portion 32b of the fixed terminal 32, and a crimp fixing portion 33a and a terminal portion 33b of the fixed terminal 33 are provided in a portion corresponding to each switch element 30. Furthermore, a hole 33c is formed in the caulking fixing portion 33a, and the contact material 40 is welded and fixed to the contact portion 32a.

Then, the belt-shaped member 39 is sequentially fed into the resin molding die in the belt-shaped state by an amount corresponding to each switch element 30, and is molded in the base 31. Then after molding,
The portions of the lines indicated by reference characters A, B, and C, which are the portions protruding from the base 31, are cut to form the fixed terminals 32, 33 molded in the base 31.

The movable contact member 34 is formed by punching and molding a thin metal material having spring properties, and as shown as a single item in FIG. 3, a movable piece portion 34a and a fixed terminal that are arranged to face the contact portion 32a.
A base portion 34b, which is caulked and fixed to the 33, is integrally formed in a substantially U-shape in plan view with a narrow portion 34c connecting the both portions interposed therebetween. Further, the base 34b is provided with a hole 34d corresponding to the hole 33c of the fixed terminal 33. When the base portion 34b is caulked and fixed to the fixed terminal 33 on the base 31 side, the periphery of the fixed portion of the base portion 34b slightly warps with respect to the base 31, but this warpage occurs. It is absorbed by the narrow portion 34c existing between and, and the movable piece portion 34a is hardly affected. Therefore, due to the variation in the caulking strength of the base portion 34b, the occurrence of warpage in the movable piece portion 34a becomes almost zero, and caulking management of the base portion 34b does not require so much accuracy. When the warp width of the base portion 34b varies depending on the material of the movable contact member 34 and the like, the width dimension of the narrow portion 34c is determined by the material of the movable contact member 34 and the like. In the movable contact member 34, the hole 34d is formed in the hole 3 of the fixed terminal 33.
It is arranged corresponding to 3c, and in this state, it is crimped and fixed to the fixed terminal 33 via the eyelet member 42. Then, the movable contact member 34 is fixed to the base 31 side in a state where the movable contact member 34 and the fixed terminal 33 are electrically connected via the crimped portion.
Further, in this state, the free end of the movable piece portion 34a is held in a state of being slightly separated from the contact material 40 on the contact portion 32a.

The film sheet 35 is fixed on the movable contact member 34 and then fixed to the base 31 in a state where the recess 36 of the base 31 is covered, and arranged so that insulation between the pressing spring 6 and the movable contact member 34 can be obtained. Has been done.

The switch element 30 configured as described above has a movable piece portion 34a.
The contact material 40 and the contact material 40 are normally separated from each other, and the fixed terminals 32 and 33 are held in a non-conductive state. When the movable piece 34a is pushed by the pressing spring 6 through the film sheet 35 by pushing down the operating member 4, the movable piece 34a is swung about the narrow portion 34c as a fulcrum to contact the contact member 40. Contact. Thereby, a conduction state between the fixed terminal 32 and the fixed terminal 33 is obtained. When the pushing down of the operating member 4 is released and the pressing spring 6 returns, the movable piece 34a also separates from the contact member 40 and returns to the initial state, and the non-conduction state between the fixed terminals 32 and 33 is obtained again. .

Therefore, the switch in which the base portion 34b and the movable piece portion 34a of the movable contact member 34 are formed in a substantially L shape in this way is
When 4b is caulked and fixed to the fixed terminal 33 and a deformation such as a warp occurs in the base portion 34b, this deformation is not directly transmitted to the movable piece portion 34a, whereby the clearance dimension between the movable piece portion 34a and the contact member 40 is always maintained. A matched switch can be obtained, and a highly reliable switch with little variation in product accuracy can be obtained.

<Effect of the Invention> As described above, according to the switch according to the present invention,
Since there is no variation in the gap between the movable piece and the fixed contact, product accuracy is stable. This improves reliability.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part of a switch according to an embodiment of the present invention, FIG. 2 is a front view of the essential part of the same switch shown with a film sheet removed, and FIG. 3 is a movable part of the same switch. FIG. 4 is a front view showing a single contact member, FIG. 4 is a front view showing a fixed terminal molded on the base of the switch in a state before molding, and FIG. 5 is a schematic view of an internal structure of a general push button switch. The sectional view shown in FIG. 6 is a front view showing an example of a movable contact member in a conventional switch. 1 ... Switch, 2 ... Case, 3,30 ... Switch element, 4 ...
Operating member, 6 ... Pressing spring, 31 ... Base, 32, 33 ... Fixed terminal, 32a ... Contact part, 34 ... Movable contact member, 34a ... Movable piece part,
34b ... Base part, 39 ... Fixed contact member.

Claims (1)

[Scope of utility model registration request] 1. A case, a switch element arranged in the case, an operating member urged in a return direction and reciprocally attached to the case, and one end fixed to the case and the other end. Is a free end and comes into contact with the operating member to move the switching element by the reciprocating movement of the operating member, the switch element comprising a resin base and the base. A fixed contact member fixed to the fixed contact member, and a movable piece portion that is disposed so as to face the fixed contact member and is brought into contact with the fixed contact member by the pressing spring, the base portion of which is fixed by caulking to the fixed terminal on the base side. And a movable contact member formed of a thin sheet metal material, wherein a base portion and a movable piece portion of the movable contact member are integrally formed in a substantially U-shape in a plane with a narrow portion sandwiched therebetween. Switch to be.