CN2665893Y - Waterproof thin-film circuit slice of cashier's machine keyboard - Google Patents

Abstract

The utility model discloses a waterproof film circuit wafer in a keyboard applied in a gathering machine, essentially consisting of an upper wafer, a middle wafer and a lower wafer, wherein the upper wafer and the lower wafer are respectively provided with a silver paste guide line and a key-press contact; the middle wafer is provided with a contact contacting hole; the upper wafer, the middle wafer and the lower wafer are also respectively provided with location holes that are mutually communicated with each other; seal glue layers are arranged between the circumference edges of the upper wafer and the middle wafer, between the upper parts of the upper wafer and the middle wafer and the edge of a through hole that is communicated with the outside; seal glue layers are also arranged between the circumference edges of the middle wafer and the lower wafer, between the upper parts of the middle wafer and the lower wafer and the edge of the through hole that is communicated with the outside. As seal glue layers that are arranged between the film circuit wafer and the related parts that are communicated with the outside, the film circuit wafer of the structure has comparatively good waterproof function; besides, the silver paste guide line and the key-press contact do not oxidize, thus greatly prolonging the service life of the film circuit wafer and reducing the application cost.

Description

Waterproofing membrane circuit wafer in the cash register keyboard

Technical field

The utility model relates to the keyboard that uses on the cash register, refers more particularly to the waterproof construction of the film circuit wafer in this kind keyboard.

Background technology

Cash register is widely used in places such as supermarket, hotel, market, the structure of employed keyboard generally includes in the cash register: button, in the key position hole during button is installed on the plate, middle plate generally all matches with the shell of cash register and fixes with shell, the downside of middle plate is provided with elastic sheet rubber, the elastic sheet rubber downside is provided with the conductive film circuit wafer, and the downside of conductive film circuit wafer is provided with base plate, and base plate is fixedlyed connected with middle plate usually.Above-mentioned film circuit wafer is combined by three of the upper, middle and lower that transparent thin-film material is made usually, on last and following sheet, be respectively arranged with silver and starch lead bar and key contacts, key contacts is corresponding with the position of button, in sheet be separator, for make last slice and following sheet on key contacts can be in contact with one another, on the relevant position of middle sheet, offer the contact contact hole, in addition, for easy for installation, accurate positioning also offers the location hole that can connect mutually respectively on three in upper, middle and lower.The shortcoming of the film circuit wafer of above-mentioned traditional structure is: when having water to be splashed on the film circuit wafer in the keyboard, water will by last slice with the edge, surrounding of middle sheet, and last slice with middle sheet on the through hole that communicates with the external world---enter into as location hole last slice and sheet between, equally also can be by the edge, surrounding of middle sheet with following sheet, and in the through hole that communicates with the external world on sheet and the following sheet---enter between sheet and the following sheet as location hole, will have influence on the operate as normal of film circuit wafer like this, and, silver in the film circuit wafer of this structure slurry lead bar and key contacts are easy to contact with air or water and produce oxidative phenomena, this can increase the contact resistance of key contacts greatly, shorten the useful life of film circuit wafer, finally can have influence on the operate as normal of cash register, and can increase use cost.

Summary of the invention

At the problems referred to above, the utility model will provide the film circuit wafer in a kind of cash register keyboard with water-proof function.

The technical solution adopted in the utility model is: the waterproofing membrane circuit wafer in the described cash register keyboard, mainly by last slice, middle sheet and following sheet combine, on last and following sheet, be respectively arranged with silver and starch lead bar and key contacts, middle sheet is a separator, on middle sheet, offer the contact contact hole, last slice and following sheet on key contacts can be in contact with one another by the contact contact hole, on last, middle sheet and following sheet, also be respectively arranged with the location hole that can connect mutually; Be characterized in: last with the surrounding of middle sheet along between, and last slice and middle sheet on be provided with sealant layer between the edge of the through hole that communicates with the external world; The surrounding of middle sheet and following sheet along between, and in also be provided with sealant layer between the edge of the through hole that communicates with the external world on sheet and the following sheet.

The utility model has the advantages that: owing in film circuit wafer with on the relevant position that the external world communicates, be provided with sealant layer, therefore, the film circuit wafer of this structure not only has water-proof function preferably, and the silver in the film circuit wafer is starched the lead bar and key contacts can not produce oxidative phenomena because of completely cutting off with air, prolonged the useful life of film circuit wafer greatly, guarantee the operate as normal of film circuit wafer and cash register better, reduced use cost.

Description of drawings

Fig. 1 is the front view of film circuit wafer described in the utility model;

Fig. 2 is 1 A-A cutaway view.

Execution mode

Below in conjunction with the drawings and specific embodiments technical scheme described in the utility model is further described.

As shown in Figure 1 and Figure 2, film circuit wafer in the cash register keyboard described in the utility model, mainly by transparent thin-film material make last slice 5, middle sheet 10 and following sheet 9 combine, on last 5 and following sheet 9, be respectively arranged with silver slurry lead bar---owing to last slice 5, middle sheet 10 and following sheet 9 make by transparent material, thereby schematically mark silver slurry lead bar with label 4 in Fig. 1, and silver is starched the also invention main points of non-this patent of lead bar; On last 5 and following sheet 9, also be respectively arranged with plurality of keys contact 3 and 8, middle sheet 10 is a separator, for make last slice 5 and following sheet 9 on key contacts 3 and 8 can be in contact with one another, on middle sheet 10, offer contact contact hole 6, during actual the use, by the button on the lower keyboard just can make last slice 5 and following sheet 9 on key contacts 3 and 8 be in contact with one another by contact contact hole 6, at last 5, also be respectively arranged with the location hole 2 that can connect mutually on middle sheet 10 and the following sheet 9---in the present embodiment, last slice 5, in location hole on sheet 10 and the following sheet 9 run through and be one, the purpose that location hole is set is for easy for installation, accurate positioning; In the present embodiment, last 5 with the surrounding of middle sheet 10 along between, and last slice 5 and middle sheet 10 on the through hole that communicates with the external world---be in the present embodiment between the edge of location hole 2 and be provided with sealant layer 1, diagonal line hatches part as shown in fig. 1; Equally, the surrounding of middle sheet 10 and following sheet 9 along between, and in the through hole that communicates with the external world on sheet 10 and the following sheet 9---be in the present embodiment between the edge of location hole 2 and also be provided with sealant layer 7.

The advantage of the film circuit wafer of said structure is: the current-carrying part in the film circuit wafer---silver slurry lead bar and key contacts all are sealed, like this, even splash water on the film circuit wafer, can not penetrate in the film circuit wafer yet, thereby can guarantee the operate as normal of film circuit wafer, such keyboard just has good water resistance, and slurry lead bar of the silver in the film circuit wafer and key contacts be not because of producing oxidative phenomena with air is isolated, prolonged the useful life of film circuit wafer greatly, guarantee the operate as normal of film circuit wafer and cash register better, reduced use cost.

In addition, in the present embodiment, since only last 5 with the surrounding of middle sheet 10 along between, be provided with sealant between the edge, surrounding of middle sheet 10 and following sheet 9 and between the edge of location hole 2, thereby be interconnected between all key contacts 3 and 8 in the film circuit wafer and between all contact contact holes 6, that is: air can flow between whole film circuit wafer, thereby when pushing button, making key contacts 3 and 8 on upper and lower to be in contact with one another just adhesion phenomenon can not appear, just can not hinder the regular event of button.

Claims (1)

1, the waterproofing membrane circuit wafer in the cash register keyboard, mainly by last slice, middle sheet and following sheet combine, on last and following sheet, be respectively arranged with silver and starch lead bar and key contacts, middle sheet is a separator, on middle sheet, offer the contact contact hole, last slice and following sheet on key contacts can be in contact with one another by the contact contact hole, on last, middle sheet and following sheet, also be respectively arranged with the location hole that can connect mutually, it is characterized in that: last with the surrounding of middle sheet along between, and last slice and middle sheet on be provided with sealant layer between the edge of the through hole that communicates with the external world; The surrounding of middle sheet and following sheet along between, and in also be provided with sealant layer between the edge of the through hole that communicates with the external world on sheet and the following sheet.

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