CN2262288Y

CN2262288Y - Film switch

Info

Publication number: CN2262288Y
Application number: CN 96207578
Authority: CN
Inventors: 廖炳谦
Original assignee: Acer Computer Co Ltd
Current assignee: BenQ Corp
Priority date: 1996-03-27
Filing date: 1996-03-27
Publication date: 1997-09-10
Anticipated expiration: 2006-03-27

Abstract

The utility model relates to a film switch which comprises an upper film, the bottom surface of the upper film is printed with an upper pad, and the upper pad is provided with a lower edge. The utility model comprises a lower film, the top surface of the lower film is printed with a switch lower pad which corresponds to the upper pad, the utility model is switched on when the upper pad is contacted with the lower pad, and the lower pad is provided with an upper edge. A first pad assembly is arranged around the upper pad, and the first pad assembly is provided with the lower edge. A second pad assembly is arranged at around the lower pad and corresponds to the first pad assembly, and the second pad assembly is provided with the upper edge. When the upper film is pressed, the dimension can be formed between the lower edge of the upper pad and the upper edge of the lower pad of the utility model, the dimension can be formed between the lower edge of the first pad assembly and the upper edge of the second pad assembly, and the latter dimension is smaller than the former dimension. When the upper film is pressed and deformed, the first pad assembly is contacted with the second pad assembly, so the upper pad and the lower pad of the utility model are contacted with each other.

Description

Thin film switch

The utility model relates to a kind of thin film switch.

Traditional thin film switch (membrane switch) as shown in Figure 1, comprises a upper film 11, fills up 111, one switch underlays 131 on film 13, a distance piece 12, the switch once.When the stressed downward distortion of upper film 11, pad 111 contacts with switch underlay 131 on the switch, makes this switch be action (ON) state.The space that upper and lower pad and the distance piece of switch limited is called the distance piece hole.The material of upper and lower film is a polyester film.

If will improve the operational sensitivity of thin film switch, realize with diameter that increases the distance piece hole or the thickness that reduces distance piece 12 usually.But this mode can run into the too high problem of sensitivity sometimes again.During such as this type of thin film switch of use under high temperature, low temperature environment, easily produce the phenomenon of unstable or unexpected action.

At above-mentioned problem, the purpose of this utility model is to provide a kind of improved thin film switch, and it has high sensitivity and high stability.

The purpose of this utility model is achieved in that promptly provides a kind of thin film switch, comprising: a upper film, and the one bottom surface is printed with on the switch and fills up, and spacer has a lower edge on this switch; Film once, one end face are printed with a switch underlay that fills up on should switch, and pad constitutes this thin film switch path with contacting of switch underlay on the switch, and this switch underlay has a upper limb; One is provided with isolating the interval film of upper film, following film; Around the pad at least one first cushion block group is set on this switch, this first cushion block group has a lower edge; Be provided with one second cushion block group of the corresponding first cushion block group around the switch underlay, this second cushion block group has a upper limb, pad lower edge and switch underlay upper limb first size apart under stress not on the switch, the first cushion block group lower edge and the second cushion block group upper limb are at a distance of one second size, and second size is less than first size.

Thin film switch of the present utility model improves members such as its cushion block, and it is active in one's movements, good stability, and operation is practical, reliable.

Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein:

Fig. 1 is the cutaway view of prior art thin film switch;

Fig. 2 is the cutaway view of the utility model thin film switch;

Fig. 3 is a 3-3 line cutaway view among Fig. 2, and the pad and the first cushion block group correlation on the utility model switch are shown;

Fig. 4 is another embodiment cutaway view of the utility model.

As shown in Figure 2, thin film switch 2 of the present utility model comprises a upper film 21, fills up 211 on film 23, a distance piece 22, the switch once, one switch underlay 231 and at least one cushion block group 212 around pad 211 on the switch, and at least one cushion block group 232, and each cushion block group 212 corresponding cushion block group 232 around switch underlay 231.In other words,

cushion block group

212 or 232 is distributed in around the upper and lower cushion block group of switch with planetary.Its correlation can be more clearly as can be seen from Figure 3.It (is 0.040mm～0.110mm) that the size of above-mentioned film is about 0.075mm ± 0.035mm.

The purpose of this cushion block group is set, is to prevent that the upper and lower pad 211,231 of thin film switch from producing bungle or unsettled situation.Therefore, as shown in Figure 2, the thickness of cushion block group 212 should be greater than the thickness of pad 211 on the switch, and the thickness of cushion block group 232 should be greater than the thickness of switch underlay 231.When the upper film stress deformation, after the first cushion block group contacted the second cushion block group earlier, the middle upper and lower pad of switch is contact condition, because the help of the first cushion block group and the second cushion block group, thin film switch has preferable action sensitivity and stability.

According to a preferred embodiment, spacer one lower edge on the switch, spacer one upper limb under the switch, the first cushion block group tool, one lower edge, the second cushion block group tool, one upper limb, when upper film is not stressed, pad lower edge and switch underlay upper limb are at a distance of a first size on the switch, the first cushion block group lower edge and the second cushion block group upper limb are at a distance of one second size, and second size is less than first size, when the upper film stress deformation, after the first cushion block set of contact, the second cushion block group, underlay contact condition on the middle switch, the help of this first cushion block group of mat and the second cushion block group, thin film switch has action sensitivity and stability preferably.

The utility model is provided with cushion block group 212,232, can reduce distance piece 22 thickness or even fully phase out distance piece 22, but still can possess desired action susceptibility, not bungle or action problem of unstable.

In addition, when end user's applied force disappeared, cushion block group 212,232 of the present utility model can make and fill up 211 on the switch than the easier quick resilience of prior art, reduces and rebounds the time.

Finish simultaneously or finish simultaneously when the making of cushion block group 212,232 basal layers can be made with the upper and lower pad 211,231 of switch, do not increase production process with other printing layers.In the prior art, the upper and lower pad the 211, the 231st of switch, with silver (conduction) pastel be printed in upper film 21 and down film 23 make through the suitable speed baking of thermophilic, at the same time, can finish the printing of 212A, 232A basal layer synchronously.

Used printing material when the printing material of 212B, 232B thickening layer can have drawn from the making thin film switch is as silver slurry (conductor), carbon film or graphite film (conductor), insulating varnish (non-conductor).In other words, directly utilize original processing procedure of making thin film switch, can obtain 212B, 232B to reduce manufacturing cost.For example, the printing step that relates to carbon dust or graphite in the winding displacement end manufacturing of thin film switch combination, outer one deck 212B, the 232B of covering of cushion block group, can when winding displacement end printing carbon dust or graphite, finish synchronously, for example, reaching upper and lower pad outer surface between each conductor line switch, is to increase reliability, covering insulating varnish is mostly arranged, and also available this printing process of cover layer 212B, the 232B of above-mentioned cushion block group is finished synchronously.

Make cushion block group 212,232 and change original flow process of making upper and lower film assembly hardly, also do not increase new fabrication schedule, and its product property is stable.

With reference to figure 4, it is another embodiment of the utility model, wherein, compares with Fig. 2, cancels distance piece 22, and realizes the function of distance piece with the contact of cushion block group 212,232.In order to have the function of distance piece, must on 212B, 232B, be coated with one deck 412C, 432C more in case of necessity.The printing material of this layer 412C, 432C can be taken at used arbitrary printing material when making thin film switch, as silver slurry (conductor), carbon film or graphite (conductor), insulating varnish (non-conductor).Can directly utilize the original technology when making thin film switch in case of necessity, to obtain 412B, 432B.212A adds that 212B, 232A add the thickness of 232B and position arrangement if enough realize the sensitivity of thin film switch and during stability, 412C, 432C then can remove from, otherwise should add.

Claims

1, a thin film switch comprises: a upper film, and the one bottom surface is printed with on the switch and fills up, and spacer has a lower edge on this switch; Film once, one end face are printed with a switch underlay that fills up on should switch, and pad constitutes this thin film switch path with contacting of switch underlay on the switch, and this switch underlay has a upper limb; One is provided with isolating the interval film of upper film, following film; It is characterized in that around the pad at least one first cushion block group is set on this switch, this first cushion block group has a lower edge; Be provided with one second cushion block group of the corresponding first cushion block group around the switch underlay, this second cushion block group has a upper limb, pad lower edge and switch underlay upper limb first size apart under stress not on the switch, the first cushion block group lower edge and the second cushion block group upper limb are at a distance of one second size, and second size is less than first size.

2, thin film switch as claimed in claim 1 is characterized in that, the first cushion block group and the second cushion block group are made by the conductor material double exposure.

3, thin film switch as claimed in claim 1 is characterized in that, the first cushion block group and the second cushion block group are that conductor layer and non-conductor layer material double exposure are made.

4, thin film switch as claimed in claim 1 is characterized in that, the first cushion block group and the second cushion block group are that non-conductor layer material double exposure is made.

5, a thin film switch comprises:

One upper film, the one bottom surface is printed with on the switch and fills up, and spacer has a lower edge on this switch; Film once, one end face are printed with a switch underlay that fills up on should switch, and pad and contacting of switch underlay constitute the path of this thin film switch on the switch, and this switch underlay has a upper limb; It is characterized in that around filling up on the switch at least one first cushion block group is set, this first cushion block group has a lower edge; Be provided with one second cushion block group of the corresponding first cushion block group around the switch underlay, this second cushion block group has a upper limb; Pad lower edge and switch underlay upper limb size apart under stress not on the switch, the first cushion block group lower edge then contacts with the second cushion block group upper limb, and the upper and lower pad of switch becomes contact condition under stress.

6, thin film switch as claimed in claim 5 is characterized in that, the first cushion block group and the second cushion block group are made by the conductor material double exposure.

7, thin film switch as claimed in claim 5 is characterized in that, the first cushion block group and the second cushion block group are made by conductor layer and non-conductor layer material double exposure.

8, thin film switch as claimed in claim 5 is characterized in that, the first cushion block group and the second cushion block group are made by non-conductor layer material double exposure.