JPH0217384Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch device such as a keyboard switch, and its purpose is to provide a switch device that is easy to assemble and has a good feel.

Hereinafter, embodiments of the present invention will be described based on the drawings.

As shown in FIG. 1, a large number of operating pieces 2 are arranged on a frame 1 of the switch, and each operating piece 2
As shown in FIG. 2, it is rotatably connected to the frame 1 by a pair of thin-walled portions 2a. A plate spring 3 as shown in FIGS. 4 and 5 is arranged on the back surface of the operating piece 2. The leaf spring 3 is made of an elastic metal material such as brass, has a substantially rectangular outline, and has a thickness of, for example, about 0.1 mm.

A pair of cut holes 4 are formed substantially parallel in the center of the leaf spring 3, and both of the cut holes 4 are opened in a substantially arch shape, and each of the arc-shaped opening edge 4a and the linear opening edge 4a The opening edge 4b is formed line-symmetrically. In addition, the outer part 5 of each notch hole 4
A pair of bent portions 6 are formed at a predetermined interval, respectively, and the valley-fold crease 6a formed in each of the bent portions 6 is aligned with the linear opening edge 4b that is in the cutting direction of the cut hole 4. It is orthogonal to Therefore, by forming this bent portion 6 on the outer portion 5, the outer portion 5 sandwiched between the bent portions 6 is shortened under tension.

As a result of the shortening of the outer portion 5, the curved portion 7 narrowed between the notch holes 4 bulges upward in a convex shape as shown in FIG. A protruding engaging portion 8 is provided, and each engaging portion 8 is provided with an engaging hole 9.

On the other hand, the operation piece 2 is provided with a pair of through holes 10, and each of the through holes 10 is provided with an engaging protrusion 11 on its inner wall. Further, on the back surface of the operating piece 2, a pressing portion 12 having a circular or oval-shaped flat surface as shown in FIGS. 6 and 7 is provided to protrude downward. The plate spring 3 is attached to the operating piece 2 by engagement between both the engagement holes 9 and the engagement protrusion 11, as shown in FIG.

Contacts 13a and 13b are arranged below the leaf spring 3, as shown in FIGS. 9 and 10. The contact 13a is attached to the upper insulating sheet 14, and the other contact 13b is attached to the lower insulating sheet. sheet 15
The contacts 13a and 13b are opposite to each other. Further, an insulating spacer 17 is interposed between the lower insulating sheet 15 and the upper insulating sheet 14 except for the contacts 13a and 13b. and,
The plate spring 3 is placed on the upper insulating sheet 14, and the flanges 3a formed at both ends of the plate spring 3 are in contact with the upper part of the insulating spacer 17 via the upper insulating sheet 14. Further, above the upper insulating sheet 14, a display plate 19 made of a thin aluminum plate or the like is provided with a spacer 18 and a frame 1 interposed therebetween.

Next, the operation of the switch according to this invention will be explained.

FIG. 9 shows a state in which the switch is off, that is, a state in which the leaf spring 3 is not pressed.
In this state, the curved portion 7 bulges upward, and the contacts 13a and 13b are not closed and open. On the other hand, FIG. 10 shows the state in which the switch is on, that is, when the leaf spring 3 is pressed through the operating piece 2, and the curved portion 7 of the leaf spring 3 presses the operating piece 2. As you go, pressing part 1
When the constant stroke operation piece 2 is lowered, the curved part 7 is reversed, and this reversed curved part 7 is bent downwardly by the flat surface of the upper insulating sheet 14.
Press to close contacts 13a and 13b. 1st
Figure 1 shows the relationship between the operating stroke of the operating piece 2 and the pressing force at this time, where point P represents the inverted position of the curved portion 7, and point Q represents the position where the contacts 13a and 13b are closed. . As is clear from this figure, when the curved portion 7 is pressed with a flat surface having a large area, the pressure applied to the operation piece 2 falls off at an acute angle after the curved portion 7 is reversed, resulting in a very good switch feel. Moreover, the center of the curved part 7 and the pressing part 1
Even if the center of the switch 2 is slightly misaligned, since the curved portion 7 is pressed by a flat surface with a large area, the switch can always be operated reliably. Then, when the pressing force on the operating piece 2 is released, the self-returning force of the plate spring 3 causes the curved portion 7 to bulge upward again and the contacts 13a and 13b open.

As explained above, according to the present invention, not only is it possible to assemble the leaf spring with the control piece attached in advance, but also when the height of the curved part of the leaf spring varies, this variation can be corrected. This can be absorbed by the relative movement between the engagement hole and the engagement protrusion, and since the pressing part of the operating piece and the curved part of the leaf spring contact each other through a flat surface with a large area, the pressure of the curved part can be absorbed. After reversing, the pressure applied to the operating piece drops sharply, and reliable switch operation is possible despite slight misalignment between the pressing part and the curved part, making assembly easy and providing a good operating feel. A switch device can be provided.

[Brief explanation of the drawing]

Figure 1 is an overall configuration diagram showing the arrangement of switches, Figure 2 is a detailed enlarged view of section A in Figure 1, and Figure 3 is a cross section of the frame taken along line B-B in Figure 2. Figure 4 is a plan view of the leaf spring of the present invention, Figure 5 is a side view of Figure 4, Figure 6 is a plan view and sectional view showing the shape of the pressing part of the present invention, and Figure 7 is the main FIG. 8 is a sectional view showing the state of engagement between the leaf spring and the operating piece; FIG. 9 is a side sectional view of the switch in the OFF state; FIG. The figure is a side sectional view of the switch in the on state.
The figure is a curve showing the relationship between the operating stroke of the operating piece and the pressing force. 1... Frame body, 2... Operation piece, 3... Leaf spring, 7
...Curved portion, 8...Engagement portion, 11...Engagement protrusion,
12... Pressing portion, 13a, 13b... Contact.

Claims (1)

[Scope of utility model registration request] A plate spring made of an elastic metal material is interposed between an operating piece connected to the frame via a hinge portion and a contact placed opposite to the operating piece, and by pressing the operating piece, the plate In a switch device that opens and closes the contact via a spring, the leaf spring is provided with a curved portion convexly curved in a direction opposite to the contact, and engagement portions bent in the direction opposite to the contact are provided on both sides of the curved portion. an engagement hole formed in the engagement portion is movably engaged with and held by an engagement protrusion provided on the operation piece, and a pressing portion is provided on the operation piece that protrudes toward the contact point, A switch device characterized in that a curved portion of the leaf spring is brought into elastic contact with a flat surface provided on the pressing portion.