JPH0332017Y2 - - Google Patents

Description

[Detailed description of the invention] [Summary] This is a push button switch that electrically connects and disconnects an outer contact and an inner contact by reversing a disc-shaped spring, and the inner contact has elasticity. This increases the snap pressure, does not damage the contact portion and the disc spring, and allows the operator who presses down the switch to obtain a better switch feeling.

[Industrial application field]

The present invention relates to a push-button switch that uses a disc-shaped spring.

Push-button switches, which switch between contacts (electrodes) by utilizing the reversing motion of a disk-shaped spring made of spring metal, have relatively high contact pressure and can operate reliably, and can be made thin, making them suitable for use in keyboards, etc. Widely used.

[Conventional technology]

FIG. 7 is a sectional view showing a conventional push button switch.

A push button switch using such a disc-shaped spring is composed of a switch section 24 and an operating section 23.

The switch portion 24 includes a terminal plate 25, a disc-shaped spring 27, and an actuator 26.

Terminal plate 25 receiving disc spring 27 in recess 28
The mold body is formed by molding plastic and has a recess 28, a plurality of electrodes 29 exposed at the center of the recess 28, a conductor terminal 31 whose other end is led out to one side of the mold body, and a mold body having a recess 28. It is made of an insulating sheet which covers the opening surface of the recess 28 after receiving the dish-shaped spring 27 in the recess 28. The convex surface of the convex spring 27 inserted into the recess 28 faces upward, and the actuator 26, one end of which is fixed to one end of the terminal plate 25, has a protrusion 26a protruding toward the center of the convex spring 27. They are starting to touch each other.

The insertion part 23 includes a slider 35 and a coil spring 36 that move up and down along a push button 33 and a guide 34. When the push button 33 is pressed, the insertion part 23 is inserted into the tip part 26b via the slider 35 and the coil spring 36 compressed by an appropriate amount. When the actuator 26 is pressed down, the protrusion 26a presses the disc-shaped spring 27, and the disc-shaped spring 27
The unevenness becomes reversed.

As a result, the disk-shaped spring 27, which was in contact with the electrode 30 and separated from the electrode 29 during the illustrated non-operation, is replaced by the electrode 29.
9 and electrode 30, conductor terminals 31 and 3
2 is electrically closed.

Then, when the pressing force is removed, the dish-shaped spring 27 and the coil spring 36 restore their positions by their own elastic restoring force and return to the illustrated state, that is, the conductor terminal 31
and 32 are restored to their separated state.

[Problem that the invention attempts to solve]

In the conventional push button switch, the contact points with the disc spring 27 formed on the terminal plate 25, that is, the electrodes 29 and 30, are fixed to the molded body, so when the disc spring is reversed by pressing the push button, the disc spring 27 and the electrode 29 come into contact with a strong impact force.

This has caused damage to the disc spring 27 and the electrode 29, causing problems.

Further, since the snap pressure is only the reverse of the disk-shaped spring 27, the operator who presses the push button cannot feel a complete switch.

[Means for solving problems]

In order to solve the above problems, the present invention is a push-button switch that connects and disconnects the inner and outer contacts using a dish-shaped spring, and the inner contacts are mounted on a frame that has elasticity and only fixes both ends. To provide a push button switch whose inner peripheral contact can be moved up and down by elasticity.

[Effect]

With a push button switch like the one described above, the elastic force of the inner contact itself acts simultaneously with the reversing force of the disk spring, and the snap pressure increases when the switch is pressed down. absorbs the impact force.

〔Example〕

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

1 to 6 show an embodiment of a push button switch in which a disc spring is arranged parallel to the direction in which the push button is pressed.

Figure 1a is a plan view of the terminal board, which is the main part of the present invention, Figure 1b is a sectional view taken along line a-a' in Figure 2, and Figure 2 is a
3 is a diagram illustrating the process of attaching a disc spring to the terminal plate shown in FIG. 1, and FIG. 4 is a diagram illustrating the configuration of the push button switch of this embodiment. 5 is a completed external view of the push button switch manufactured as shown in FIG. 4, and FIG. 6 is a diagram showing the pressing force characteristics of the push button switch of the above embodiment.

In Figures 1 to 5, 1 is a terminal plate, 2 is an outer contact, 3 is an inner contact, 4 and 5 are terminals connected to the contacts, 6 is a frame forming the inner contact 3, and 7 is an inner contact. A molded die, 9 is an upper terminal having an outer circumferential contact 2, 10 is mylar, 11 is a lower terminal having an inner circumferential contact 3 on the frame 6, 15 is a dish-shaped spring, 17 is a push button, 18 is a housing, 22
is the substrate.

First, let's talk about the terminal board 1, which is the main part of this invention.
This will be explained with reference to FIGS.

The terminal board 1 has a through hole in the center, and around the hole are four outer contacts 2, terminals 4, and four gourds 13 formed with an upper terminal 9 and an inner contact 3 made of phosphor bronze, and both ends are attached to the outer frame. Lower terminal 1 forming two connected trapezoidal frames 6
It is formed by inserting an insulator made of mylar 10 having a through hole between it and the molded die 7 having through holes in the center and outer periphery. Fixing at this time is extremely simple, as it only requires inserting the gourd 13 of the upper terminal 9 into the hole 14 provided in the die 7 and bending the gourd 13.

In the terminal board 1 formed in this way, the trapezoidal frame 6 made of phosphor bronze is located within the through hole 8 of each component constituting the terminal board 1, so it cannot move up and down due to the elasticity of the material itself and the deflection due to its trapezoidal shape. This is possible, and the inner peripheral contact point 3 provided at the center of this frame 6 has elasticity.

A dish-shaped spring 15 is attached to the recess 12 of the terminal board 1 so as to contact the outer peripheral contact 2, and then an insulating sheet 16 is attached to cover the opening surface of the recess 12.
will be established. (FIG. 3) Although phosphor bronze is used for the frame 6 in this embodiment, the material is not limited to this as long as it is a spring material with elasticity.

Next, the structure of the push button switch according to this embodiment will be explained with reference to FIG.

The push button switch of this embodiment includes a push button 17, a housing 18, a slider 19, a coil spring 20, a lever 21, a terminal plate 1' for receiving the disc spring, and a base body 22.
It consists of.

The switch part consists of a terminal plate 1' that receives a disc-shaped spring and has terminals 4 and 5 led out, and a lever 21.The terminal board 1' stand upright on the base 22. The lever 21 has a through hole 21a in the center through which the terminal plate 1' passes.
It has a pair of protrusions 21b near the left end of the side faces facing each other in the front-rear direction, and these protrusions 21b are rotatably fitted into the bearings 22b of the base body 22.

The housing 18 includes a through hole 18a that guides the vertical movement of the slider 19, and a through hole 18b into which the upper end of the upright terminal plate 1' fits. 18 is fitted into the recess 22c of the base 22. On the other hand, the slider 19 has a recess 19a into which a projection provided on the back side of the push button 17 is press-fitted;
A protrusion (not shown) protruding from the center of the recess opening on the lower surface into which the upper part of the coil spring 20 fits, and a locking end surface 19b to prevent the coil spring 20 from slipping out above the housing 18.

When such a push button switch is not pressed down, the disc spring 15 protrudes outward due to its own elasticity and contacts only the outer peripheral contact 2, and the lever 21 inserted into this has a protrusion 21c upward. It is maintained in an elevated position.

When the push button 17 is pressed from this state, the protrusion on the back side of the push button 17 compresses the coil spring 20 via the slider 19, thereby pushing down the protrusion 21c of the lever 21 and rotating the lever 21 by a predetermined amount clockwise. Due to this rotation, the protrusion on the inner surface of the lever 21 reverses the unevenness of the disc spring 15. Then,
Both the outer peripheral contact 2 and the inner peripheral contact 3 of the terminal plate 1' are in contact,
A pair of terminals 4 and 5 are electrically connected.

Next, the pressing force characteristics of the push button switch will be explained with reference to FIG.

In FIG. 6, the vertical axis is the pressure and the horizontal axis is the pressed distance. A has elasticity at the inner peripheral contact point of this embodiment, and B has no elasticity as in the conventional case.

Point X, where the pressure suddenly decreases in the graph, is the moment the switch is turned on, and the difference in pressure based on point X becomes the snap pressure, which is the switch feeling felt by the operator. The higher the snap pressure, the better the operator can feel when switching, but in the case of the conventional switch B, the snap pressure is only about 12g even at high levels. When I went there, I found that the snap pressure was as large as 15.7g.

In this embodiment, a push-button switch with a vertical terminal board in which the push-button pressing direction and the disc-shaped spring are parallel is explained, but it is also effective in a push-button switch with a horizontal terminal board with a disc-shaped spring running perpendicular to the pressing direction. Of course there are.

〔effect〕

According to the push button switch of the present invention, the push button is pressed down,
When the disc spring and the inner contact of the terminal plate come into contact, in addition to the reversing force of the disc spring, the elastic force of the inner contact itself acts, increasing the snap pressure when pressed, giving the operator a higher switching feeling. can be given.

In addition, the elastic force of the inner circumferential contact absorbs and alleviates the impact when pressed, and can prevent damage to the disc spring and the inner circumferential contact.

[Brief explanation of the drawing]

Figures 1a and b are a plan view and a sectional view of the terminal board, which is the main part of the present invention, Figure 2 is a diagram for explaining the structure of the terminal board in Figure 1, and Figure 3 is a diagram showing the terminal board with a plate. FIG. 4 is a diagram showing the process of attaching a shaped spring, FIG. 4 is a diagram for explaining the configuration of the push button switch of this embodiment, and FIG.
Figure 6 is an external view of the completed push button switch, and Figure 6 is a diagram showing the pressing force characteristics of the push button switch of this embodiment.
The figure is a sectional view illustrating a conventional push button switch. Explanation of symbols, 1...Terminal board, 2...Outer contact,
3... Inner peripheral contact, 4, 5... Terminal, 6... Trapezoidal frame, 15... Belleville spring.

Claims (1)

[Claims for Utility Model Registration] (1) Consisting of a terminal plate 1 having an outer circumferential contact 2 and an inner circumferential contact 3, and a disk-shaped spring 15 disposed to cover these contact portions, the disk-shaped spring 15 is inverted. The push button is configured to electrically connect and disconnect the outer circumferential contact 2 and the inner circumferential contact 3 by rotating the push button, and the inner circumferential contact 3 is formed on a frame 6 having elasticity. Switch. (2) The push button switch according to claim 1, wherein the frame 6 is bent into a trapezoidal shape.