JPH1064365A - Folded laminated membrane - Google Patents

Abstract

(57) Abstract: Provided is a folded laminated membrane in which floating can be hardly generated in the vicinity of a bent portion of the membrane, and a punched-out cutout portion is hardly left as a residue. A folded portion Va in an upper membrane 11 located on an upper side and a lower membrane 12 located on a lower side are folded so as to overlap each other with a spacer 20 having a switching gap hole 22 formed therebetween. , V
An upper contact portion 15 and a lower contact portion 16 serving as switches are provided in the vicinity of b, respectively, and the wide portions 1a, 2a, 3a, 4a and the narrow portions 1b, 2b connected to the left and right of the bent portion of the membrane. Notch 1 consisting of, 3b, 4b
To 4 are formed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a folded laminated membrane having a single flexible membrane which is folded so as to overlap each other with a spacer having a switching gap formed therebetween.

[0002]

2. Description of the Related Art A membrane used for a conventional folded laminated membrane is shown in a developed view in FIG. The membrane 30A is struck from both ends toward the center so that the gaps 22 for switching as shown in FIG. 3 overlap each other with a predetermined number (here, nine) of spacers 20 formed therebetween. It is bent at a bent portion V indicated by a long dashed line in the middle portion where the cutout portions 33 and 34 are formed.

[0003] Of the membrane 30A, a predetermined number (here, nine) of switching operations are performed on the upper membrane 31 located on the upper side and the lower membrane 32 located on the lower side when folded. An upper contact portion 35 and a lower contact portion 36 on the disk are provided, and a predetermined wiring pattern and the like (not shown) are formed.

Accordingly, when the membrane 30A is bent at the bent portion V with the spacer 20 interposed therebetween and bonded by an appropriate bonding means (double-sided tape or the like), a cross section near the center is shown in FIG. As described above, the upper contact portion 35 located at, for example, the center of the upper membrane 31 and the lower contact portion 36 located at the center of the lower membrane 32 face each other.

[0005] The folded laminated membrane 30 having the above-described structure.
When the upper contact portion 35 of the upper membrane 31 is pressed down with a key or the like, the upper membrane 31 bends and the upper contact portion 35
(ON), and when the pressing is released, the upper contact portion 35 returns to the original position due to the elasticity of the upper membrane 31 (OFF).
To).

[0006]

However, in the folded laminated membrane 30 as described above, the membrane 3
0A is bent at the bending portion V with the spacer 20 interposed therebetween, as shown in FIG.
In particular, at a portion near the bent portion V, the membrane 3
Lifting occurs due to the tenacity at the time of bending of 0A, that is, the so-called stiffness.

[0007] When the floating occurs near the bent portion of the membrane 30A as described above, the upper contact portion 35 and the lower contact portion 36 are obliquely opposed and separated from each other, and the upper contact portion 35 is separated from the lower contact portion 36. In order to turn on by contacting, a larger pressing operation force is required as compared with the case where a floating member is not turned on as shown in FIG. There is a problem that variations occur and operability, operation stability, and reliability are impaired.

As one measure for solving such a problem, the length of the bent portion V in the left-right direction is reduced.
In other words, it is conceivable to extend the punched cutouts 33 and 34 in the central direction to make them longer. By doing so, the stiffness of the membrane 30A is weakened, so that the above-mentioned lifting is suppressed.

However, in the folded laminated membrane 30, a predetermined wiring pattern is usually formed on the upper membrane 31 and the lower membrane 32, and these wiring patterns are connected to each other by the upper membrane 31 and the lower membrane 32. Are connected via a bent portion V connecting the wires, so that the wiring is concentrated around the bent portion V,
For this reason, the relatively wide punched cutouts 33 and 34 as shown in the figure cannot be extended in the center direction.

In this case, if the cutout notch is made thinner than that shown in the figure, it can be extended in the center direction. However, if the punched cutout is made thinner, it is difficult to remove the thin punched cutout that has been punched out by a press or the like, so that it may become scum and remain attached to the membrane. When a wiring pattern is formed on the membrane, a problem such as disconnection occurs when the wiring pattern is formed on the membrane.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. An object of the present invention is to improve the shape of a cut-out notch provided on the left and right sides of a bent portion to thereby improve the membrane. In addition to making it difficult for floating to occur near the bent portion, it is also possible to make it difficult for the punched cutout portion to remain as a residue, so that the upper contact portion can contact the lower contact portion without requiring a large pressing operation force. Provide a folded laminated membrane that can equalize the required pressing operation force, and can reduce the occurrence of problems such as disconnection, and can greatly improve operability, operation stability, and reliability. Is to do.

[0012]

In order to achieve the above object, a folded laminated membrane according to the present invention basically comprises:
An upper membrane and a lower membrane, each of which has a single flexible membrane that is bent so as to overlap vertically with a spacer having a switching gap formed therebetween, and that is located above the membrane. An upper contact portion and a lower contact portion each serving as a switch are provided in the vicinity of a bent portion of the lower membrane located at a position above, and by depressing the upper contact portion of the upper membrane, the upper membrane bends and the upper contact portion is bent. The part contacts the lower contact part.

[0013] The present invention is characterized in that a punched notch formed of a wide portion and a narrow portion connected thereto is formed on the left and / or right side of the bent portion of the membrane.

In a more preferred embodiment, the bent portions are provided at two places on the left and right, and the cutout cutouts are formed on the left and right of each.

In the bent laminated membrane of the present invention having such a configuration, the punched cutout portion is formed of a wide width portion and a narrow width portion connected thereto, so that wiring near the bent portion is obstructed. Without this, the punched cutout can be made much longer than before, so the length of the bent part in the left-right direction can be shortened, and the stiffness at the time of bending the membrane can be reduced, and as a result , While making it difficult for the membrane to float near the bent portion,
The upper contact portion can be brought into contact with the lower contact portion without requiring a large pressing operation force, and the required pressing operation force can be made uniform.

Further, since the narrow portion which is likely to adhere to and remain on the membrane is connected to the wide portion, it is easier to remove than the narrow portion alone, and the situation where the thin portion remains attached to the membrane is eliminated. Inconveniences such as disconnection can hardly occur, and operability, operation stability, and reliability can be significantly improved in combination with the effect of the punched cutout portion.

[0017]

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

FIG. 1A shows a membrane used in an embodiment of the folded laminated membrane according to the present invention in a developed view.

The folded laminated membrane 10 of the illustrated embodiment
As shown in FIG. 1 (B), the membrane 10A in a developed view is mutually interposed with a spacer 20 having a switching gap hole 22 formed therebetween as shown in FIG. It is bent at two right and left bent portions Va and Vb in an intermediate portion where three punched cutouts 33 and 34 punched in a shape as described later are formed so as to overlap.

The upper and lower membranes 11 and 12 of the membrane 10A are respectively provided with a predetermined number of switches, an upper contact portion 15 and a lower contact portion 16 (a bent portion in the figure). Only those near the part are shown), and a predetermined wiring pattern 19 is formed so as to connect them.

In the folded laminated membrane 10 as well, when the upper contact portion 15 of the upper membrane 11 is depressed, the upper membrane 11 is bent so that the upper contact portion 15 comes into contact with the lower contact portion 16. ing.

In the present embodiment, the cutout notches 1 and 2 are provided on the left and right of the bent portions Va and Vb, respectively.
2 and 3, 4 are formed. The punch notch 1
It comprises a wide portion 1a, a narrow portion 1b and a convex portion 1c connected to the wide portion 1a.
It comprises a narrow portion 2b and a convex portion 2c connected thereto, and the punched cutout portion 3 comprises a wide width portion 3a connected to the punched cutout portion 2 and a narrow width portion 3b connected thereto. The punched cutout portion 4 includes a large width portion 4a and a narrow width portion 4b connected thereto.

In the folded laminated membrane 10 of the present embodiment having such a configuration, the punched cutouts 1 to 4 are formed as follows.
Wide width portions 1a, 2a, 3a, 4a and narrow width portions 1 connected thereto
Since the shape is formed of b, 2b, 3b, and 4b, the punched cutout can be made much longer than the conventional one without obstructing the wiring in the vicinity of the bent portions Va and Vb. It is possible to shorten the length,
We can weaken the stiffness when bending the membrane,
As a result, floating can be less likely to occur near the bent portion of the membrane, the upper contact portion can be brought into contact with the lower contact portion without requiring a large pressing operation force, and the required pressing operation force can be made uniform.

The narrow width portions 1b, 2b, 3b, 4b which are likely to adhere to and remain on the membrane are the wide width portions 1a, 2a, 3
a, 4a, it is easier to remove than the narrow width portion alone, and the situation that it remains attached to the membrane is eliminated. Therefore, troubles such as disconnection can hardly occur. The operability, operation stability, and reliability can be significantly improved in combination with the effects.

By providing two bent portions and forming four cutout notches, it is possible to obtain an effect that twisting, misalignment, and the like are less likely to occur when the membrane is bent.

[0026]

As will be understood from the above description, in the folded laminated membrane of the present invention, the punched cutouts provided on the left and right sides of the bent portion have a specific shape. It is possible to make it difficult for floating to occur, and it is also difficult for the cutout notch to remain as waste,
The upper contact portion can be brought into contact with the lower contact portion without requiring a large pressing operation force, and the required pressing operation force can be made uniform, and troubles such as disconnection can hardly occur. This has the effect of greatly improving stability and reliability.

[Brief description of the drawings]

FIG. 1 shows an embodiment of a folded laminated membrane according to the present invention, wherein (A) is a view showing the membrane in an expanded state,
(B) is a partial enlarged sectional view.

FIG. 2 is a view showing a membrane used in an example of a conventional folded laminated membrane in a developed view.

FIG. 3 is a view showing a spacer used in an example of a conventional folded laminated membrane.

FIG. 4 is an enlarged cross-sectional view near the center of an example of a conventional folded laminated membrane.

FIG. 5 is an enlarged cross-sectional view near a bent portion in an example of a conventional folded laminated membrane.

[Explanation of symbols]

 1, 2, 3, 4 punch cutout portions 1a, 2a, 3a, 4a wide width portions 1b, 2b, 3b, 4b narrow width portions 10 folded laminated membrane 10A membrane 11 upper membrane 12 lower membrane 15 upper contact portion 16 Lower contact part 20 Spacer 22 Gap hole

Claims (2)

[Claims] 1. A flexible membrane which is bent so as to overlap vertically with a spacer having a switching gap formed therebetween, and which is located on the upper side of the membrane. An upper contact portion and a lower contact portion each serving as a switch are provided in the vicinity of the bent portion of the upper membrane and the lower membrane located on the lower side, and the upper membrane is depressed by pressing down the upper contact portion of the upper membrane. In the bent laminated membrane in which the upper contact portion is bent to be in contact with the lower contact portion, a punch comprising a wide portion and a narrow portion connected to the left and / or right side of the bent portion of the membrane. A folded laminated membrane having a notch formed therein. 2. The folded laminated membrane according to claim 1, wherein the bent portions are provided at two places on the left and right, and the punched cutouts are formed on the left and right sides, respectively.