JPH0646033Y2 - Membrane panel switch with click board - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a membrane panel switch with a click plate mainly used as an operation switch of a control plate, and is characterized in that its durability is particularly improved.

(Prior Art) Membrane panel switches with a click plate have existed conventionally, and one example thereof is shown in FIG.

In the figure, reference numeral 1 is a spacer for holding respective contacts 2 and 3 to be short-circuited in a spaced manner, a substrate 4 on which one contact 3 is formed, and another contact 2 on the upper side. The rubber sheet 5 is stacked. On the rubber sheet 5, another spacer 7 for accommodating and holding the click plate 6 which is made to sound when bent is stacked, and a cover sheet 8 is attached to the upper surface of the spacer 7.

Here, the click plate 6 means an elastic plate that can be restored and deformed by pressing the convex surface portion to flatten it when the switch is operated.

When operating the above-mentioned membrane panel switch, the upper portions of the contacts 2 and 3 on the upper surface of the covering sheet 8 are lightly pressed with, for example, a finger. As a result, the click plate 6 is flattened and emits a clicking sound, and the contacts 2 and 3 are short-circuited to each other to turn the switch ON. Then, the oppressed finger is applied to the covering sheet 8
When it is released, the click plate 6 is restored and deformed again, each contact 2, 3 is returned to the initial state, and the switch is turned off. The switch operator can judge the operation of the switch by the clicking sound of the click plate 6.

(Problems to be Solved by the Invention) In the above-mentioned conventional membrane panel switch, the operator who operates the switch does not always press the upper surface of the cover sheet 8 directly above the center of the click plate 6. . For example, when operating this kind of switch provided on a control plate, the operator generally operates the switch while visually checking the display projected on the display screen or the like in order to avoid erroneous operation. Does not press the upper surface portion of the cover sheet 8 directly above the center of the click plate 6 while visually observing the switch, but presses the approximate upper surface portion of the cover sheet 8 to be pressed. Therefore, the click plate 6 is often pressed and flattened at a portion deviated from the center thereof.

Under such circumstances, the click plate 6 is repeatedly subjected to an unbalanced pressing force, which causes deformation fatigue, which impairs the switch function, and in some cases, in combination with the material of the click plate 6 and residual strain during processing. The click plate 6 may be damaged, and it cannot withstand the repeated use of 2 million times or 3 million times, which is the required life of the switch, and is damaged at most hundreds of thousands of times, or even thousands of times. There are examples, and the losses that result from this are not small.

In addition, although the ones such as Japanese Utility Model Laid-Open No. 61-68432 and Japanese Patent Laid-Open No. 61-82626 are also known, in the former case, the peripheral edge of the click plate (reversing leaf spring) directly contacts the peripheral side wall surface in the spacer when the switch is operated. The peripheral side wall surface is damaged due to the pressing of the spacer, and in order to prevent this, it is necessary to make the spacer volume relatively large like the latter, and it is also necessary to make the spacer volume large. Cause problems in proper operability.

The present invention has been made in view of the above problems, and its purpose is to allow the switch operator to press the upper part of the covering sheet and the part other than the central part above the click plate under the space of the spacer which can be made compact and compact. Even if it is operated, it is an object of the present invention to provide a membrane panel switch with a click plate so that the click plate always receives an appropriate pressing force at its central portion.

(Means for Solving Problems) That is, as shown in FIG. 1, the present invention is a contact to be short-circuited.
20 and 21 are formed on the substrate 9, and a spacer 10 is superposed on the substrate 9 so that the through hole 10a provided therein includes the contacts 20 and 21, and the spacer 10 is provided in the through hole 10a. From the bottom, contact points with the peripheral wall of the through hole 10a are sequentially contacted, and contact points 21 with the rising portions 14, 14 whose lateral movement is restricted are formed. The click plate 11 for short-circuiting, and the central part of the click plate 11 is pressed against the lower surface. Pushing the pushing plate 12 having the through holes 16 and 16 through which the rising portions 14 and 14 of the contacts 21 and 21 are inserted and slidable at the protruding portions 12a and the both ends, and further the spacer 10 It is characterized in that a flexible covering sheet (13) is placed on the upper surface so as to cover the upper opening of the through hole (10a).

(Operation) Even if the operator presses the upper surface portion of the covering sheet 13 with a finger or the like, and the pressing plate 12 is displaced downward due to the pressing force on the upper surface side deviated from the central portion, the operation is performed on the pressing plate 12. Since the pressing force to be transmitted is transmitted to the click plate 11 through the protruding portion 12a thereof, the click plate 11 always receives the pressing force at its substantially central portion.

At this time, the rising portions 14 and 14 are moved upward without damaging the spacer side wall.

(Example) Hereinafter, a specific example of the present invention will be described with reference to the drawings.

1 and 2 show an example in which the present invention is applied to an operating portion of a control plate.

A spacer 10 is superposed on the substrate 9, and a click plate 11 and a push plate 12 are sequentially housed in the switch through hole 10a of the spacer 10 from the lower side. Further, the through hole 10a is formed on the upper surface of the spacer 10. A cover sheet 13 is provided so as to cover it.

The spacer 10 is made of a non-conductive material such as extruded foamed polypropylene. In this example, the thickness thereof is set to about 3 mm, and each through hole 10a provided therein is 10 in plan view.
It has a square shape of about 10 mm.

The click plate 11 is made of a conductive material and has a convex surface portion 11a formed by a drawing process or the like.When the operator presses the convex surface portion 11a with a load such as a finger of about several hundred grams, the click plate 11 can be restored and deformed flat. It will be transformed. As shown in FIGS. 3 (a) to 3 (d) for details, the shape in plan view is formed in a cross shape, and the through holes 10 are provided in a pair of opposing sides.
(A) A rising part that abuts on the peripheral wall and is restricted in horizontal movement
14 and 14 are formed, and a bulged portion 11b having a diameter of about 2 mm is formed in the central portion of the lower surface by pressing or the like.
The entire lower surface is silver-plated to improve conductivity.

The pushing plate 12 is formed with a protrusion 12a at a substantially central portion of the lower surface, and the protrusion 12a is arranged so as to contact the center of the convex portion 11a of the click plate 11, and the peripheral wall of the through hole 10a and The click plate 11 is guided by the rising portions 14 of the click plate 11 so as to be vertically movable and has a relatively large rigidity. The details are as shown in FIGS. 4 (a) to 4 (c), that is, the plan view shape is substantially the same size as the through hole 10a and the four corners are cut out, and they are opposed to each other. The pair of sides 15 and 15 are provided with through holes 16 and 16 for inserting the rising portions 14 and 14 of the click plate 11, respectively, and a spherical portion 17 that slightly bulges on the upper surface thereof. Are formed.

The cover sheet 13 is made of a non-conductive flexible thin film material, and has a required display on its upper surface. That is, in this example, as shown in FIG. 2, a frame line 18 indicating the position of the through hole 10a and a switch number 19 are attached.

The substrate 9 supports the members mounted thereon and also serves as a base for forming the contacts 20 and 21 to be short-circuited and the contact circuit. In order to improve the conductivity of each contact 20, 21, a pair of + contact 20 is formed among the contacts 20, 21 and a minus contact 21 is formed between the plus contact 20 and the contact 20. Made of gold-plated.

The click plate 11 is bridged between the pair of positive contacts 20 and 20 in a state where the pair of sides and the contacts 20 and 20 are in contact with each other. In addition, 22 is a double-sided tape for joining each member.

In the above embodiment, when the upper part of the covering sheet 13 is now pressed with a finger, the push plate 12 is displaced downward against the elasticity of the click plate 11, and the protrusion 12a thereof is the convex portion 11a of the click plate 11. Click plate because it works to press the central part
11 is flattened in a balanced form. in this case,
Even if the pressing force of the finger does not necessarily act on the central portion of the click plate 11, the protruding portion 11a precedes and presses the central portion of the click plate 11, so the click plate 11 has no special circumstances. As long as it is, the pressure is always applied to the central part.

Further, since the pressing plate 12 has the spherical portion 17, the position of the pressing plate 12 can be easily determined, and the pressing force of the finger can be easily transmitted to the pressing plate 12 suitably.

Then, when the click plate 11 is flattened, its bulging portion 11b is pressed against the minus contact 21, and the contacts 20 and 21 are short-circuited, and the switch is turned on.

Then, when the finger is released from the cover sheet 13, the elasticity of each member such as the click plate 11 restores each part to its original state, and the switch is turned off.

If the click plate 11 produces a sound, the switch
A sound is emitted in the process of turning on, and the operator
The ON state can also be known by hearing.

(Effect of device) As described above, according to the present invention, when the pressing force of a finger or the like acts to displace the pressing plate 12 downward despite the decrease in the spacer volume, the protruding shape of the pressing plate 12 is generated. The part 12a always precedes and accurately presses the central portion of the convex surface part 11a of the click plate 11, and the unbalanced pressure as in the past does not act on the click plate 11 even by the switch operation similar to the conventional one. As a result, damage to the click plate 11 and the spacer peripheral side wall surface is prevented, and since the rising portions 14 and 14 are inserted into the through holes of the push plate 12, the guide as well as the durability as a switch are remarkably accurate. In addition, the great loss in the related art, which is derived from that, can be prevented.

[Brief description of drawings]

FIG. 1 is a sectional view of the product of the present invention, FIG. 2 is a perspective view of the same product, FIG. 3 shows a click plate, (a) is a plan view, (b) is a front sectional view, and (c) is Sectional side view, FIG. 4 shows a push plate, (a) is a plan view, (b) is a partially broken front view,
(C) is a side view, and FIG. 5 is a sectional view showing a conventional example. (Code) 9 ... Substrate, 10, 10A ... Spacer, 10a ... Through hole, 11,
11A ... Click plate, 12,12A ... Push plate, 12a ... Projection part, 13 ... Coating sheet, 14 ... Rise part, 20,21 ... Contact point

Claims (1)

[Scope of utility model registration request] 1. A through hole (10) having contacts (20, 21) to be short-circuited formed on a substrate (9) and a spacer (10) provided therein.
A rising part 14 is provided on the substrate 9 so that a includes the contacts 20 and 21, and is abutted against the peripheral wall of the through hole 10a from below in the through hole 10a so that lateral movement is restricted. , 14 formed with contact points 21 and 21 for short-circuiting, and a protruding portion 12a for pressing the central portion of the click plate 11 to the lower surface and the rising portions 14 and 14 of the contact points 21 and 21 at both ends. The push plate 12 having the through holes 16 and 16 which are slidable and are slidable,
Further, the membrane panel switch with a click plate is characterized in that a flexible covering sheet 13 is placed on the upper surface of the spacer 10 so as to cover the upper opening of the through hole 10a.