JPH0421971B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a pressure switch such as a pine switch, in which a pressurized conductive elastic body is inserted like a sandwich between flat mesh wires with gaps between the meshes, and these are bonded to an adhesive elastic material. The gist is that it is integrated by coating it with resin and bonding it.

Conventionally, there are pressurized switches of this type as shown in FIGS. 1a and 1b.

Reference numeral 1 denotes an insulating substrate, on which a pair of electrodes 3 and 4 are printed and wired. a pair of electrodes 3,
4, a pressurized conductive elastic body 6 is placed so as to bridge the pressurized conductive elastic body 6.
The conductors 7 are placed on top of each other so as to overlap each other, and their upper surfaces are completely covered with an insulating pressure plate 2.
In this case, an insulating support member 8 is interposed between the insulating substrate 1 and the insulating pressure plate 2 except where the switch element 5 consisting of the pressurized conductive elastic body 6 and the conductor 7 is arranged. The pressurized conductive elastic body 6 and the conductor 7 are connected to the corresponding contact surfaces of the insulating substrate 1 and the insulating support member 8 using a fixing member 9 made of vinyl tape or the like with both ends fixed. Fix it like that.

The pressurized conductive elastic body 6 is made of silicone rubber with metal powder embedded in the vertical direction, so when the insulating pressure plate 2 is pressed, the pressing force is applied to the pressurized conductive elastic body 6. conduction, thereby 1
The pair of electrodes 3 and 4 are electrically connected, power is supplied to a drive device (not shown), and a door, for example, located close to each other is opened. However, such a conventional pressure switch has the following problems.

(1) This type of pressure switch has a pressure conductive elastic body 6
It is essential that the conductor 7 and the conductor 7 are always in close contact with each other to maintain a conductive state. However, since the main body of the pressurized conductive elastic body 6 is made of silicone rubber, it is impossible to bond it with a general epoxy conductive adhesive. Silicone-based conductive adhesives also exist, but they have the disadvantage that their resistance value increases over time, and they also have the disadvantage that the resistance value increases over time. Bonding the elastic body 6 and the electrode 4 respectively requires a complex and multi-step manufacturing process, and it is practically difficult to bond the pressurized conductive elastic body 6, the conductor 7, and the electrodes 3 and 4 directly. .

Therefore, conventionally, the pressurized conductive elastic body 6 and the conductor 7 are fixed to the insulating substrate 1 using a fixing member 9 such as vinyl tape as shown in FIG. 1B.

However, in devices such as a pine switch where irregular pressing force is repeatedly applied on the insulating pressure plate 2, the fixing member 9 as described above is used.
In practice, it is difficult to prevent deviations between the two.

(2) Conventional pressure switches have a pair of electrodes printed on an insulating substrate (polyethylene film) 1, but printed wiring is expensive, which makes this type of pressure switch expensive and difficult to use. is hindering the expansion of

(3) Each switch element must be bridged onto a pair of electrodes and fixed with a fixing member, which complicates the manufacturing process and makes production inefficient.

The present invention has been made in order to solve the above-mentioned problems existing in conventional pressure switches.

The present invention will be explained according to the embodiments shown in FIGS. 2 to 6.

FIG. 2 shows a flat mesh wire 10 constituting the electrode of the present invention.
It is shown. As the flat mesh wire 10, a slit is made with a forming tool in a band-shaped metal mesh product or a metal plate having mesh-like gaps between metal wires 101 such as copper wire, and in this state, the metal plate is pulled to enlarge the slit. It is possible to use a mesh product (eg, precision expanded metal manufactured by Taiyo Kinami Co., Ltd.) in which mesh spaces are formed.

The pressure switch according to the present invention is shown in FIGS. 3a and 3b.
As shown in FIG.
0 and 10' in a sandwich-like manner, and then covered and bonded with adhesive elastic resin 11 to integrate them. That is, for example, as shown in FIGS. 4a and 4b, a mold 13 made of polyester has a recess 14 formed in the center in the longitudinal direction, the width of which is larger than the width of the flat screen wires 10, 10'. After the flat mesh wire 10', the pressurized conductive elastic body 6, and the flat mesh wire 10 are sequentially arranged so as to overlap each other in the center of the wire 14, a silicon adhesive 11 is poured as an insulating elastic resin. As a result, the outer periphery of the switch element 12 consisting of the flat mesh wire 10', the pressurized conductive elastic body 6, and the flat mesh wire 10 is coated and bonded with a silicone adhesive 11, and the gap between the meshes of the flat mesh wires 10 and 10' is bonded. By filling the inside with silicone adhesive 11, the switch element 12 is bonded and integrated with the silicone adhesive.

In such a configuration, when the pressing force P shown in FIG. 3b is applied, the pressurized conductive elastic body 6 becomes electrically conductive due to the pressing force, and the electrodes 10 and 10' become electrically conductive.

In this case, in the present invention, the flat mesh wires 10 and 10', which are electrodes, arranged on the upper and lower surfaces of the pressurized conductive elastic body 6 have the same shape as if projections were formed over the entire surface. In addition, since a silicon adhesive with sufficient elasticity is embedded between the meshes, the switch sensitivity is better than when using a flat plate, and the present inventor's According to experiments, it has high durability.

Therefore, the strip-shaped switch element 1 according to the present invention
2 as shown in FIG. 5, it is possible to realize a highly durable matte switch with good switch sensitivity.

In this case, as shown in FIG. 5, if the switch element 12, which is a band-shaped body, is bent at a substantially right angle, the bent portion 19 is bent.
It is difficult to arrange the switch element part 9 in a state where it remains horizontal in a free state, and there is a possibility that it may not be able to function as a switch element. Therefore, in such a case, the switch element 12 is formed by the method shown in FIG. 4c.

A recess 17 of approximately the same width as the width of the flat screen wire 10 is formed across the longitudinal center of the polyester mold 15, and recesses 16 of the same size are formed on both sides of the recess 17, preferably alternately. , 16'.

Plain mesh wire 10', pressurized conductive elastic body 6, flat mesh wire 1
0 are placed one after another in the recess 17 so as to overlap, and then the silicon adhesive 11 is poured into the recesses 16, 16', 17. As a result, it is possible to manufacture a switch element integrated with a silicone adhesive, in which alternate silicone adhesive convex layers are formed on both sides.

According to such a switch element, the flat mesh wire 1
It has been confirmed through experiments by the inventor that if the width of 0 and 10' is set to about 2 to 3 mm, it is possible to easily bend the switch element 12 while maintaining the horizontal state. Further, according to the method shown in FIG. 4c, since the recesses 17 function as positioning of the screen wires 10, it is possible to realize a switch element in which the screen wires are straight over the entire length of the switch element, which is preferable.

With this configuration, switch element 1
2 is a notch 18 having a bent portion 19 shown in FIG.
The guide body 20 can be easily horizontally arranged along the notch 18, and sufficient switch performance can be exhibited over the entire surface. In this case, the guide body 20 is made of an elastic body such as a sponge, the entire upper surface of the guide body 20 is covered with an insulating pressure plate 2, and the weight of the insulating pressure plate 2 is supported by the guide body 20 when not pressed. If a step is provided at the upper surface level of the switch element 12 and the guide body 20, and the specifications are set so that when pressing, the pressing force is applied to the flat mesh wire and the pressurized conductive elastic body, resulting in conduction, malfunctions can be prevented. It is possible to realize a pressurized switch without any pressure.

FIG. 6 shows still another embodiment of the present invention.

In this embodiment as well, a pressurized conductive elastic body 6 is inserted like a sandwich between the flat mesh wires 10 and 10' having a gap between the meshes, and these are bonded with a silicone adhesive 1.
The point that the coating was bonded and integrated in step 1 is the same as in the above embodiment, but in this embodiment,
One electrode, ie, the flat mesh wire 10', is connected to the switch element 1.
2 is arranged over the entire length in the longitudinal direction to form a common electrode, and the other side electrode, the flat mesh wire 10', is
A plurality of pieces are divided and arranged as shown as a' to 10d'.

If you do this, each different electrode 1
By applying pressing force to 0a' to 10d', power is applied to different desired circuits, and 1
It is possible to control multiple devices with just one switch element. Possible fields of application include switches for driving elevators up and down, switch elements built into dampers of automatic guided vehicles, and the like.

The main effects of the present invention are as follows.

(1) According to the present invention, there is no need to print and wire expensive electrodes on an insulating substrate as in the conventional method, which simplifies the manufacturing process and significantly reduces production costs. is possible,
We can expect the use of this type of pressure switch to expand.

(2) flat mesh wire 10 sandwiching the pressurized conductive elastic body 6;
By using 10' as an electrode, it is possible to bond and integrate the switch element with an adhesive elastic resin, thereby completely eliminating the need for a conventional switch fixing member and making it possible to A highly durable switch element with good sensitivity can be realized, and the trouble of cross-linking each switch element on each pair of electrodes, which was required in the past, is not only unnecessary, but also there is no need to Even if a regular pressing force is repeatedly applied, the pressurized conductive elastic body and the flat mesh wire will not separate or peel off.

(3) It is also possible to control multiple electrical circuits with a single switch element, and if necessary, it is only necessary to arrange a strip or rectangular body of a desired length with or without bending, etc. Its technical effect is remarkable.

The pressure switch according to the present invention can be used as a mat switch for automatic doors, a sensor for an intrusion alarm system, a switch built into a damper of an automatic guided vehicle, a switch for driving elevators up and down, a keyboard switch for a calculator, etc. Its scope of use is wide.

[Brief explanation of drawings]

Fig. 1a is a plan view of a conventional pressure switch with the insulating pressure plate removed, Fig. 1b is a sectional view of the pressure switch portion in Fig. 1a, and Fig. 2 is a plan view of a conventional pressure switch with the insulating pressure plate removed. FIG. 3a is a plan view showing an embodiment of the present invention,
3b is a sectional view taken along the line A-A' in FIG. B-
4c is a plan view for explaining another example of the manufacturing method of the pressure switch according to the present invention; FIG. 5 is a plan view showing an example of the arrangement of the pressure switch according to the present invention; FIG. 6 is a longitudinal sectional view showing still another embodiment of the present invention. 2... Insulating pressure plate, 6... Pressure conductive elastic body, 10, 10'... Flat mesh wire, 10a' to 10d'...
...Intermittently arranged flat mesh wires, 11... Silicone adhesive (adhesive elastic resin), 15... Mold, 16,
16'... Concave portions formed alternately on both sides of the concave portion 17, 17... A concave portion with an open top having approximately the same width as the plain mesh line, 18... Notch, 19... Bent portion of the notch portion , 20... Guide body.

Claims (1)

[Scope of Claims] 1. A pressurizing conductive elastic body inserted in a sandwich-like manner between flat mesh wires with a gap between the meshes, and then covered and bonded with an adhesive elastic resin to be integrated. Switch. 2. Insert the pressurized conductive elastic body in a sandwich-like manner between the flat wires with a gap between the meshes, cover and bond them with an adhesive elastic resin, form the integrated body into a band shape, and A pressure switch with uneven parts formed on both predetermined sides. 3. Insert the pressurized conductive elastic body in a sandwich-like manner between flat mesh wires with a gap between the meshes, cover and bond them with an adhesive elastic resin, and form the integrated body into a band shape. The device comprises a switch element having uneven portions formed on both sides thereof, and a guide member made of an elastic body such as a sponge and having a cutout portion having a bent portion, and the switch element is disposed within the cutout portion of the guide member. and a pressure switch configured such that the weight of a pressure plate disposed on the upper surface of the guide member when not pressed is supported by the guide member. 4. A mold having a recessed portion having an open upper surface and approximately the same width as the flat mesh wire along the longitudinal center portion, and recessed portions alternately formed on both sides of the recessed portion;
After arranging a flat mesh wire having a band-like mesh interval in the recess in the longitudinal center of the mold, a pressurized conductive elastic body is placed so as to overlap the flat mesh wire, and the pressurized conductive elastic body is placed so as to overlap the flat mesh wire. A flat mesh line with a mesh interval is placed on top of the elastic elastic body so as to overlap it, and in this state, the upper surface level of the flat mesh line is set to be slightly lower than the levels on both sides of the mold. A method for manufacturing a pressure switch, characterized in that an adhesive elastic resin is poured into the recessed portion of the mold and bonded.