JPS6145520A - Movable contact - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a new and improved movable contact, particularly a thin keyboard assembly K11. The present invention relates to a structure of a movable contact for a push button switch useful for.

[Conventional technology]

Conventionally, flexible movable contacts, especially conductive rubber, conductive resin, or Movable contacts using metal foil or the like are widely used.

[Problem that the invention seeks to solve]

Is the movable contact mentioned above manufactured in a constantly controlled process to ensure that its surface is not contaminated? However, during the process, it is almost impossible to handle the movable contact surface 1 without contacting other parts or without touching the surface with the operator's fingers, and it is difficult to handle a large number of contacts. In addition, in conventional keyboard devices, a predetermined strobe space was created between the movable contact and the opposing fixed contact electrode. 2. Structures such as arranging appropriate space members or integrating the movable contacts with the dome-structured push button control member are adopted, and for this reason, the number of parts of the keyboard device is large. [Means for Solving the Problems J] The present invention is a new and improved method that does not involve such conventional disadvantages and drawbacks. This provides a movable contact for a keyboard device, and is made by laminating and integrating a flexible conductive member and an insulating member in multiple layers, and the insulating member is closer to the conductive member on the surface facing the fixed contact electrode surface. The gist of this is also a movable contact formed in a protruding shape.

[Effect]

The movable contact of the present invention simply places this on the fixed contact electrode (=
Increase the stroke space required for the movable contact by simply arranging it
When using the movable contact of the present invention, which can be formed by a protruding insulating member, a spacer is required for forming the stroke space of the movable contact, which is essential in conventional keyboard devices of this type. Alternatively, there is no need to adopt a dome structure or the like in place of this, and the presence of the protruding insulating member prevents the handling of this movable contact (the movable contact surface may come into contact with other members, Since there is no possibility of finger pressure or damage, contamination of the contact surface is effectively (=prevented).

〔Example〕

Hereinafter, the present invention will be described in detail based on the accompanying drawings.

First of all, Figures @1■ and @2 illustrate typical forms of the movable contacts of the present invention. The movable contact is a movable contact in which the protrusions are integrally bonded in multiple alternating manners so that their bonding surfaces are parallel to each other, and the portions of the protrusions that protrude from the surface of the conductive member l are shaped like an acute angle. The conductive member 1 is divided into parallel stripes (two or more insulating protrusions 2 are integrally formed, and the protrusions 2 are provided with cylindrical protrusions 2' protruding from the surface of the 5A conductive material 1). is placed under heat for a predetermined period,
Furthermore, movable contacts each having a flexible member 3 disposed and integrated on the back thereof are shown.

Note that the form of the movable contact shown in FIGS. 1 and 2 does not limit the present invention.

The conductive member 1 constituting the movable contact of the present invention is required to have appropriate flexibility.
This is conductive rubber, conductive synthetic resin, or its thickness is 2
50 μm or less or its bending rigidity is 2 Kp −wn
It is made of the following metal foil, etc. On the other hand, the insulating ridges 2 or protrusions 2 may be made of a hard material, but preferably made of insulating rubber or synthetic resin with a JIS rubber hardness of 10 to 90, or a porous structure thereof. good.

Furthermore, the backing member 3 as in the movable contact shown in FIG.
0 insulating rubber or synthetic resin, these porous
ff It is best to use R afforestation.

The protruding height of the protruding insulating member in the movable contact of the present invention is from 1 μm to 100 μm, preferably from 10 to 500 μm.
μm, more preferably 5Q to 300 μm. If the protruding island is less than a few μm, leaks will easily occur in a high humidity atmosphere and the withstand voltage will be low. If it exceeds 1000 μm, it will easily collapse when pressed, and the minimum required for the fixed contact electrode surface of the movable contact. This is because not only the pressing load becomes unnecessarily large, but also it becomes difficult for the movable contact surface to come into contact with the fixed contact electrode surface despite the push button operation C2, which tends to result in poor durability and reliability.

Regarding the width of the protrusion 2 or the thickness of the protrusion 2',
If these are too large, they will interfere with the suppressing operation of the movable contact, so it is desirable that they be less than 5000 μmad, and the practically preferred size is 3000 μm. I'm or less, more preferably 10
00μrrL or less.

Furthermore, the darkness of adjacent protrusions or protrusions is 50 to 10
000/jF7L, preferably 1oo to 5000#X. If the spacing is less than 50 μm, the required minimum pressing load of the movable contact becomes large, and if it is more than 100 μm, the movable contact is likely to come into contact with the fixed contact electrode due to perturbation or shock transmitted to the movable contact, causing malfunction, and the movable contact This is undesirable since it is likely to cause malfunctions such as double-pressing when operating the button.

Therefore, since the height, thickness or width of the insulating ridges 2 or protrusions 2' mentioned above and the adjacent spacing are also related to the size of the effective surface of the movable contact, these dimensions are different from those mentioned above. Depending on the size of the effective surface, it can be shaped in each case within this range.

The movable contact according to the present invention can be easily manufactured by integral molding using a pressure molding method, an extrusion molding method, etc., but it may be manufactured by any other known method.

Further, regarding the insulating protrusions 2 and protrusions in the movable contact of the present invention, the dispersion state of the insulating protrusions 2 and protrusions is as follows: Special C: Although not limited.

In the case of protrusion 2', for example, multiple protrusion surfaces are @3 causes (a
As shown in 1 to (01), the protrusions should be uniformly distributed within the effective surface of the movable contact, and in the case of 2X protrusions, the protrusions should be arranged in parallel stripes, grids, or staggered, with the spacing between adjacent protrusions being approximately equal. It is preferable.

Next, the usage mode of the movable contact of the present invention will be explained based on the drawings from FIG. 4 onwards. First, FIG. On the circuit board 6: For example, a flexible display sheet 3 having a push button area display 7 printed on the back side of a sheet-like movable contact as shown in FIGS. This shows a keyboard device.

In FIG. 5, an insulating sheet 3a integrally carrying a movable contact is placed on a printed circuit board 6, and a C nib spray 3b is further disposed thereon.

FIG. 6 111 shows a sheet-like movable contact having staggered insulating protrusions 2' on its surface placed on a printed circuit board 6 having comb-shaped fixed contact electrodes 4 and circuit wiring 5. A display sheet (3b) in which protruding ribs are provided on the back surface of the movable contact to surround the push button areas 5a, 5b, and 5c.
Fig. 1bl shows the planar arrangement of the fixed contact electrode 4 and the insulating protrusion 2' provided on the surface of the movable contact in the push button area 5a. be. The sheet-shaped movable contact shown in FIG. 6 is made by laminating an i% conductive rubber sheet with a film or sheet of polyester, for example, and then punching this laminated sheet to form a large number of small holes in a staggered arrangement. After that, an upper edge rubber sheet is laminated on the conductive rubber sheet, and the conductive rubber sheet and the insulating rubber sheet are vulcanized and integrated under pressure. The sheet-shaped movable contact obtained in this way can be easily produced by filling the polyester film or sheet with insulating rubber and finally peeling off the polyester film or sheet from the conductive rubber sheet. The insulating protrusion 2 has a height corresponding to the thickness of the sheet.

Finally, the above-mentioned movable contact according to the present invention can be used not only as a movable contact for a push button switch in each conventionally known lottery keyboard device, but also as a movable contact for a push button switch in each conventionally known lottery keyboard device. It is also very useful as a movable contact in a multi-hole input device such as a kanji input device, a movable contact in a foldable mat type sensor, a movable contact in a foot-operated mud switch, a movable contact in a slide switch, etc.

Further, the movable contacts of the present invention may be arranged independently for one or a pair of opposing fixed contact electrodes, or
Of course, it may be arranged so as to simultaneously cover a plurality of fixed contact 1i poles, or may be arranged so as to form a common 7If pole.

〔Effect of the invention〕

As explained above, the movable contact for a keyboard device according to the present invention is formed by integrally forming the flexible iB conductive member and the insulating member in an alternately laminated manner, and on the fixed contact electrode surface 1: the facing surface, The insulating member is made to protrude from the surface of the conductive member in the form of a ridge or protrusion. This movable contact is a fixed contact on the printed circuit board without using a spacer or the like to form the stroke space as in conventional keyboard devices of this kind. By simply arranging it above the BJW, the necessary stroke space can be obtained, and contamination of the surface of the main movable contact can be effectively prevented. As a result, the keyboard device can be easily made thinner, and handling during production and assembly of the keyboard device is also easier.Especially, the push button can be operated even with the push button 411 switch, which has a large push button area. Since it is extremely uniform within the area, its practical value is extremely great.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a typical form of the movable contact according to the present invention, and FIG. 2 is a perspective view of another form. Fig. 3 Fal~(01 is a plan view illustrating the dispersion state of insulating protrusions provided on the surface of the movable contact of the present invention, respectively. Fig. 4, Fig. 5, and Fig. 6 ta+ are respectively FIG. 6 is a sectional view of a main part of a different aspect of a keyboard device incorporating a movable contact of the present invention, and FIG. FIG.
・Insulating protrusion 3... Possible +ζ member (display sheet) 4...
Fixed contact electrode 5...Circuit wiring 6...Printed circuit board 7...Push button area display Patent applicant Shin-Etsu Polymer Co., Ltd. Figure 3

Claims (1)

[Claims] 1. A flexible conductive member and an insulating member are laminated and integrated in large quantities, and the insulating member protrudes from the conductive member on the surface facing the fixed contact electrode surface. Movable contacts.