DE102008005442A1 - Input keyboard for e.g. cash-machine, has drill protective foil extending over stroke-actuated areas of keyboard and supporting supports spring-tensioned safety contacts at lower side - Google Patents

Abstract

The keyboard has an operating field with multiple keys or actuating field made of silicon mat with an actuating dome made of elastomer and a layer structure arranged below the operating field. The layer structure has a holding foil (14), a spacing foil (17) and a switching foil (19) with multiple stroke-actuated spring-loaded contacts (21). A drill protective foil (30) extends over stroke-actuated areas of the keyboard. The drill protective foil supports spring-tensioned safety contacts at a lower side.

Description

The The invention relates to an input keyboard with protection against manipulation, In particular, the invention relates to protection against manipulation Foil panels as well as protection against manipulation and / or removal from above the keypad located operating buttons.

Film panels are also used in vandal resistant stainless steel keyboards for ATMs and for payment transactions used as electrical contact elements. In these applications There is more and more to the requirements that the construction against Tampering should be protected, so that reading out the pin numbers by a mechanical conversion of the keyboards or the introduction of a foreign sensor in the keyboard no longer becomes possible. The following claim describes how the foil switches by an additionally integrated contact foil - in following security film called, with trace meander is printed - can be protected.

• – Basiskleber
• – Schaltlage mit bedruckten Leiterbahnen (nachfolgend auch Schaltfolie genannt)
• – Distanzfolie
• – Haltefolie.

The actual film switch has been used as state of the art for many years in industrial applications. It usually consists of:

• - basic adhesive
• - Switching position with printed strip conductors (also referred to below as switching foil)
• - spacer foil
• - Holding film.

With the subject of DE 103 40 289 A1 It is generally known to protect hardware modules with a security device. This safety device consists of a hard plastic safety cap, on the inside of which at least two closely adjacent conductor tracks are attached. If drilled through such a safety cap, then the traces are interrupted and the previous signal flow through these traces is thus prevented. This can trigger an alarm.

A However, such arrangement is not for the protection of foil scraper fields suitable for input keyboards, because the interconnect at the Inside a hard, immovable plastic cap arranged is.

Likewise it is from the DE 36 32 144 A1 It is known to print thin film tracks on storage media to provide a conductive thin film. This prevents that a CMOS RAM memory device can be drilled or opened in any other way.

With the subject of DE 196 00 769 A1 is a security module with one-piece security film has become known. Here, a Bohrschutzfolie surrounds a security module. This can only be ensured that the security module itself is not damaged. However, from this document is not apparent how to protect input keyboards with foil scarf panels against attack from the outside.

task The invention is a protection of the contact elements of input keyboards against mechanical attack by additionally about it integrated security foils.

The Solution of the task is done by the technical Teaching of claim 1.

The Switch panel is inventively by at least another additional security foil covers, positioned over the switch contacts over the entire surface becomes.

in this connection the invention allows several possibilities, the invention Drilling protection film in one or more layers of the layer structure to integrate the keyboard. It is important that the drill protection film also covers the movable areas of the keyboard, that is, in particular the hub-operated areas of the contacts in any layer of construction.

highlight is that the additional switching position made so thin Will that affect the tactility of the buttons below is not adversely affected. In the areas to be protected is on top and / or on the back of the security film applied a conductor track structure. By the design of the tracks is detected by means of a corresponding sensor, if tracks are interrupted or shorts by introducing conductive Bodies arise, as z. B. when drilling / tapping of construction arises.

• – Basiskleber
• – Schaltlage mit bedruckten Leiterbahnen
• – Distanzfolie
• – Haltefolie
• – Sicherheitsfolie (auch Bohrschutzfolie genannt).

Structure of the protected membrane switch:

• - basic adhesive
• - Switching position with printed conductor tracks
• - spacer foil
• - Holding film
• - Safety film (also called Bohrschutzfolie).

1st variant:

Important in the present invention is that the structure of the film control panel with security film (Bohrschutzfolie) over the entire surface also extends over the switch contacts and their moving parts. This makes it possible for the first time that you can press through a flexible Bohrschutzfolie through the appropriate switching contacts a foil panel. This was not known yet. The prerequisite for this is that a very thin conductor track network is printed on a relatively thin carrier film, wherein the conductor track network can be printed either on the top or on the underside of the carrier film or printed on both sides.

Important is that the carrier film has a very small thickness of z. B. 75 microns (0.075 mm) and is so flexible that a pressure on any, above arranged actuator button through this Bohrschutzfolie on the underlying foil panel is passed on.

It is indifferent to how the operation of the Keyboard happens and how the keyboard is designed. It can either as a keypad silicone existing safety mat be provided or it can also be provided individual keys be, z. B. made of stainless steel formed in a corresponding Stainless steel frame are installed.

2nd variant:

In a development of the present invention, it is provided that the flexible drilling protection film according to the invention, which is also about the actuating surfaces of the foil panel extends, in addition to the bottom is still provided with (at least) a safety contact on the contact a flexible spring washer rests, with their Foot area is seated on the actual switching foil.

in the mounted state of the keyboard (using the first variant the Bohrschutzfolie) is when you press the keyboard the compressed respective spring plate associated with the respective contact and the two oppositely arranged contacts become closed.

As soon as the structure taken apart by an attack from outside or is destroyed, the Bohrschutzfolie due to the Spring force of the spring washer lifted from the contact on the switching film, the two contacts move away from each other and in between adjacent signal flow is interrupted.

In order to causes the Bohrschutzfolie invention also a protection against removal of the panel, especially against removal the switching foil, which is arranged at the bottom of the structure.

3rd variant:

In Another variant of the present invention is additional provided that in addition to (or instead of) the previously described spring-loaded Contact between the bottom of the turf film and the top the switching foil still at least one other pair of contacts available is.

This Contact pair again consists of a contact, the preferred the underside of the Bohrschutzfolie is arranged and the opposite a contact foil is arranged, which above the switching foil, but is located below the Bohrschutzfolie.

Important Here is that this pair of contacts always by the spring force closed the overhead keypad is. Such a force can either be due to the elasticity a silicone mat in which the keys are arranged, or by corresponding spring-loaded individual keys z. B. are made of stainless steel.

So long the keys are not pressed, their spring force acts on top of the drill protection film so that the contact on the Bottom of the drill protection film in conjunction with the two contacts the top of the underlying switching foil always closed remains.

Becomes a single button removed or the keyboard slide, then comes it to open said contacts and the intervening Signal path is interrupted and leads to an alarm.

On In this way, the invention consists of a total of three variants Tear film, all taken alone, but also in combination with each other are functional and considered to be essential to the invention.

• 1. Bohrschutzfolie, die auch über die beweglichen (betätigbaren) Teile der Tastatur gelegt ist.
• 2. Bohrschutzfolie mit einem oder mehreren federbelasteten Kontakten, wobei der eine Kontakt an der Unterseite der Bohrschutzfolie und der gegenüberliegende Kontakt an der Schaltfolie angeordnet ist. Dieses Kontaktpaar ist stets geschlossen und wird nur bei einem Angriff auf oder einem Ausbauversuch der Schaltfolie geöffnet und unterbricht einen Signalstromkreis.
• 3. Bohrschutzfolie mit einem oder mehreren federbelasteten Kontakten, wobei der eine Kontakt an der Unterseite der Bohrschutzfolie und der andere Kontakt auf einer zweiten Schaltfolie angeordnet ist, die im Schichtenaufbau oberhalb der in Ziffer 2 genannten Schaltfolie sitzt. Dieses Kontaktpaar ist stets geschlossen und wird nur bei Angriff (Ausbauversuch) auf eine Taste geöffnet und unterbricht einen Signalstromkreis.

The variants described above are summarized as follows:

• 1. Drill protection film, which is also placed over the movable (operable) parts of the keyboard.
• 2. Bohrschutzfolie with one or more spring-loaded contacts, wherein the one contact on the underside of the Bohrschutzfolie and the opposite contact is arranged on the switching foil. This contact pair is always closed and is only opened in an attack on or a removal attempt of the switching foil and interrupts a signal circuit.
• 3. Bohrschutzfolie with one or more spring-loaded contacts, wherein the one contact on the underside of the Bohrschutzfolie and the other contact is arranged on a second switching foil, in the layer structure above the in paragraph 2 said switching film sits. This pair of contacts is always closed and will open only when attack (removal attempt) on a button and interrupts a signal circuit.

Enjoy all the above variants Protection in isolation or in combination with each other.

• – Sicherheitsfolie auch über Folienschaltfelder ohne taktile Rückmeldung (ohne Kontakffederscheiben);
• – Sicherheitsfolien über Schaltfelder mit mechanischen Kurzhubtasten/Leiterplatten;
• – Sicherheitsfolien hergestellt aus gedruckten flexiblen Schaltlagen aus Polyester, PEN oder anderen flexiblen Folienmaterialien;
• – Sicherheitsfolien hergestellt aus geätzten flexiblen Schaltlagen aus Kapton, Polyimid oder anderen flexiblen Materialien;
• – Sicherheitsfolie mit/ohne Druckkontaktierungen;
• – Sicherheitsfolien mit ein, zwei oder mehreren Leiterbahnzügen mit beliebigem Layout;
• – Sicherheitsfolien mit mehrmalig auch kreuzenden Leiterbahnzügen;
• – Aufbau, bei dem der elektrische Kontakt von der Sicherheitsfolie mittels Federscheiben auf die Schaltlagenfolie übertragen wird;
• – Sicherheitsfolie integriert in Edelstahl/Metalltastaturen, Kunststofftastaturen;
• – Sicherheitsfolie integriert in Folientastaturen;
• – Sicherheitsfolie mit einem Isolationsdruck anstatt der Isolierfolie 8.

Further claims regarding the drilling protection foil:

• - Safety film also on foil panels without tactile feedback (without contact spring washers);
• - Safety films via switch panels with mechanical short-stroke keys / printed circuit boards;
• - Security films made of printed flexible circuit layers of polyester, PEN or other flexible film materials;
• - Security films made of etched flexible switch layers of Kapton, polyimide or other flexible materials;
• - Security foil with / without pressure contacts;
• - Security films with one, two or more traces with any layout;
• - Security films with multiple intersecting conductor trains;
• - Structure in which the electrical contact is transmitted from the security film by means of spring washers on the switch sheet film;
• - Safety film integrated in stainless steel / metal keyboards, plastic keyboards;
• - Safety film integrated in membrane keyboards;
• - Security film with an insulation pressure instead of the insulating film 8th ,

Proceeding is shown below, as by the above second Switching foil an additional electrical contact directly over the contact spring washers can be realized. I'm in the assembled Operation of the keyboard, this safety contact is always closed. But if the bias by disassembly of the film or one above Reduces the button ram opens, opens this safety contact. By an appropriate evaluation this opening can be recognized.

• – Sicherheitsfolie in Folientechnik über Folienschaltfelder mit geprägten Domen;
• – Sicherheitskontakte in Folientechnik auch über Folienschalffelder ohne taktile Rückmeldung (ohne Kontaktfederscheiben);
• – Sicherheitskontakte in Folientechnik mit mechanischen Kurzhubtasten/Leiterplatten;
• – Sicherheitskontakte in Folientechnik, hergestellt aus gedruckten flexiblen Schaltlagen aus Polyester, PEN oder anderen flexiblen Folienmaterialien;
• – Sicherheitskontakte in Folientechnik, hergestellt aus geätzten flexiblen Schaltlagen aus Kapton, Polyimid oder anderen flexiblen Materialien;
• – Sicherheitskontakte in Folientechnik mit/ohne Durchkontaktierungen;
• – Sicherheitskontakte in Folientechnik mit ein, zwei oder mehreren Leiterbahnzügen;
• – Sicherheitskontakte in Folientechnik mehrmalig auch kreuzende Leiterbahnzügen;
• – Aufbau, bei den der elektrische Kontakt von der Sicherheitsfolie mittels Federscheiben auf die Schaltlagenfolie übertragen wird.
• – Eine Kontaktfläche aus Silikonfolie oder Silikonformteile mit Karbon-Kontaktpillen ausgeführt ist.

Further claims regarding the second switching foil:

• - Safety film in foil technique on foil panels with embossed domes;
• - Safety contacts in foil technology also via foil scraper fields without tactile feedback (without contact spring washers);
• - Safety contacts in foil technology with mechanical short-stroke keys / printed circuit boards;
• - Safety contacts in film technology, made of printed flexible switch layers made of polyester, PEN or other flexible film materials;
• - Safety contacts in foil technology, made of etched flexible switching layers of Kapton, polyimide or other flexible materials;
• - Safety contacts in foil technology with / without vias;
• - Safety contacts in foil technology with one, two or more conductor tracks;
• - Safety contacts in foil technology several times also crossing conductor tracks;
• - Structure in which the electrical contact is transmitted from the security film by means of spring washers on the switch sheet.
• - A contact surface of silicone foil or silicone moldings is executed with carbon contact pills.

Of the Subject of the present invention does not arise only from the subject matter of the individual claims, but also from the combination of the individual claims among themselves.

All in the documents, including the abstract Information and features, in particular the spatial shown in the drawings Training, are claimed as essential to the invention, as far as individually or in combination with the state of the art Technology is new.

in the Below, the invention will be described with reference to only one embodiment illustrative drawings explained in more detail. in this connection go from the drawings and their description further essential to the invention Features and advantages of the invention.

It demonstrate:

1 : Perspective and schematized drawn structure of a foil panel with a flexible Bohrschutzfolie;

2 a section through a foil panel with a Bohrschutzfolie after

1 However, the two other variants of the present invention are also shown;

3 FIG. 2 is a schematic section through the drilling protection film according to the invention as shown in FIG 2 ;

4 : the plan view of the Bohrschutzfolie after 3 ;

5 : the perspective view of the film structure as shown in 2 ,

In 1 will later also be used as contact foil 5 designated Bohrschutzfolie only as Bohrschutzfolie 30 referred to, because according to the first variant no contact agent on the underside of Bohrschutzfolie 30 are arranged. Such contact agents are only in 2 . 3 and 5 disclosed. Therefore, the Bohrschutzfolie 30 with the contacts arranged at the bottom ( 24 . 9 ) later than contact foil 5 designated.

Overall is in 2 just a keypad 1 indicated, which may consist of a silicone mat with individual embedded in silicone switch contacts.

Instead of Such an actuator may also separate operation buttons are used, which are common Way are inserted into a rigid support frame and spring loaded there be held in the rest position due to spring washers.

It is therefore only schematically shown that the keys 2 . 3 downwards in the direction of the arrow, in each case one switching contact on the switching foil ( 19 ).

This shows the 2 that the keypad 1 with an adhesive layer 4 on the drill protection film 30 according to 1 is glued on. At the top and / or bottom of the drill protection film 30 Here is a conductor network 7 printed, which consists of a plurality of closely spaced interconnects, which are traversed by a signal current. If one of the tracks is disconnected by an attack or tampering, the signal will be interrupted and an alarm will sound. Because the Bohrschutzfolie 30 also spans the moving parts of the keyboard, it is particularly flexible and can press the buttons 2 . 3 pass down without further resistance.

This shows the 1 that the pressure on the drill protection film 30 on a holding foil 14 is given the appropriate breakthroughs 15 having. Through these breakthroughs protrude spring washers 16 through, which are curved and a certain spring force up on the button, not shown 2 . 3 exercise to keep them in the open state.

The spring washers 16 are here in appropriate shots of a spacer film 17 arranged the breakthroughs 18 having. Under the spacer film 17 is the actual switching foil 19 with the associated contacts 20 . 21 arranged. In the area of these contacts 20 . 21 the actual switching process takes place.

Will the spring washer 16 by a push of a button 2 . 3 Pressed from above, it comes to an elastic deformation and it lies down contact the surface of the contacts 20 . 21 at.

Below the switching foil 19 Here is a base adhesive film 22 arranged, which fixes the entire structure on a support plate.

Important for 1 As a result, a very flexible anti-drilling foil 30 also over the spring washers 16 and the breakthroughs 15 the holding foil 14 is taut, so as to protect these actuating surfaces against damage or penetration by drilling tools or other means. This was not known in the prior art.

Based on 2 Now other variants of the invention Bohrschutzfolie 30 shown.

Out 4 initially results that on a carrier foil 6 a ladder network 7 is printed.

The representation in 2 on the left side now shows a Ausbauschutz against removal of the lower switching foil 19 , It can be seen that at the bottom of the contact foil 5 at least one safety contact 24 is arranged, at the spring loaded a spring washer 25 invests.

In the installed state of the keyboard thus sets the spring washer 25 (which is drawn for exaggeration reasons greatly exaggerated) contact giving to the lower safety contact 23 on top of the switching foil 19 at. This is constantly in the assembled state, the contact pair 23 . 24 kept closed. Is thus upgraded something up or is the switching film 19 expanded downwards, this contact becomes 23 . 24 opened and it leads to an alarm.

As a further variant (third embodiment) is the representation in 2 On the right side. This is partly also in 3 represents.

Important here is that at the bottom of the contact foil 5 each upper contact surfaces 9 are arranged exactly in alignment above the respective spring washer 16 are arranged. This results in a special protection for each contact in conjunction with an underlying contact foil 12 , on the switch contacts 13 are arranged.

Between the upper contact foil 5 and the underlying contact foil 12 Here is an adhesive film 10 arranged which breakthroughs 11 Are defined.

The 3 still shows that the conductor network 7 downwards through an electrically insulating insulating film 8th is covered.

When assembled, the upper contact surface closes 9 the lower switching contacts 13 on the contact foil 12 short, so that always in the assembled state, protection against removal of the buttons 2 . 3 consists.

Namely, one or more of the keys 2 . 3 expanded, then lacks the spring force with which the keys 2 . 3 The contacts 9 . 13 bring in closing contact and thus remove the contacts in such an expansion 9 . 13 and the signal flow is interrupted. This provides protection against removal of the button.

It is important that this protection against removal of the key at the same time also with the characteristics of the Bohrschutzfolie 30 is provided so that also through the recess 15 through which the button 2 . 3 through the retaining film 14 through to the spring washer 16 acts, absolute protection against removal and damage is given. This was previously unknown in the prior art.

Every press of the button 2 . 3 is thus on the spring washer 16 passed and the spring washer then stretches and there is a contact between the contacts 20 and the center contact 21 by elastic deformation of the spring washer 16 ,

These relationships are in 5 shown in more detail. There is shown in perspective that the Bohrschutzfolie 30 now as a contact foil 5 is formed, wherein the contacts 9 . 24 down towards the switching foil 19 Act.

The lower contact foil 12 with the switch contacts attached there 13 is also so flexible that a corresponding pressure by the respective button 2 . 3 through the contact foil 5 and through the contact foil 12 down the spring washers 16 can deform elastically.

Because of the switching contacts 13 are designed as elastically bendable tab, the flexibility in the area of the movable surfaces of the lower contact surface is substantially increased.

1

keypad

2

button

3

button

4

adhesive layer

5

Contact sheet (above)

6

support film

7

Trace network

8th

insulation

9

Upper Contact surface (protection against removal button)

10

adhesive film

11

breakthrough

12

Contact sheet (below)

13

switching contact

14

wrap

15

breakthrough

16

spring washer

17

shim

18

breakthrough

19

switching foil

20

Contact

21

center contact

22

Based adhesive film

23

safety contact (below)

24

safety contact (above, protection against removal of panel)

25

spring washer

30

Bohrschutzfolie

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 10340289 A1 [0004]
• - DE 3632144 A1 [0006]
• - DE 19600769 A1 [0007]

Claims (10)

Input keyboard with protection against manipulation consisting of an operating field with a plurality of keys or an elastomeric actuating field (eg of a silicone mat with actuating domes) and a layer structure of a plurality of films arranged below the operating field ( 14 . 17 ) and at least one switching foil ( 19 ) with several stroke-actuated, spring-loaded contacts ( 20 . 21 ), characterized in that at least one Bohrschutzfolie ( 30 ) also extends over the hub-operated areas of the keyboard. Input keyboard with protection against manipulation consisting of an operating field with a plurality of keys or an elastomeric actuating field (eg of a silicone mat with actuating domes) and a layer structure of a plurality of films arranged below the operating field ( 14 . 17 ) and at least one switching foil ( 19 ) with several stroke-actuated, spring-loaded contacts ( 20 . 21 ), characterized in that the Bohrschutzfolie ( 5 . 30 ) one or more spring-loaded contacts ( 24 ) on the underside and one or more opposing contacts ( 23 ) on the switching foil ( 19 ), wherein the contact pair ( 23 . 24 ) is closed at rest and only in an attack on the switching film ( 19 ) or a removal attempt of the switching foil ( 19 ) is opened and interrupts a signal circuit. Input keyboard with protection against manipulation consisting of an operating field with a plurality of keys or an elastomeric actuating field (eg of a silicone mat with actuating domes) and a layer structure of a plurality of films arranged below the operating field ( 14 . 17 ) and at least one switching foil ( 19 ) with several hub-operated contacts ( 20 . 21 ), characterized in that the Bohrschutzfolie ( 5 . 30 ) one or more spring-loaded contacts ( 9 ) on the underside to which one or more opposing contacts ( 13 ) at one above the switching foil ( 19 ) arranged contact foil ( 12 ), wherein the contact pair ( 23 . 24 ) is closed in the idle state by the spring load of the keyboard arranged above and only in an attack on the keypad ( 1 ) or a removal attempt of the button ( 2 . 3 ) is opened and interrupts a signal circuit. Input keyboard according to one of claims 2 or 3, characterized in that the at least one Bohrschutzfolie ( 30 ) also extends over the hub-operated areas of the keyboard. Input keyboard according to one of claims 1 to 4, characterized in that the pressure on the Bohrschutzfolie ( 30 ) on a holding foil ( 14 ), the breakthroughs ( 15 ), by which spring washers ( 16 ), which are arched and which have a certain spring force up on the button ( 2 . 3 ) in order to keep them in the open state. Input keyboard according to claim 5, characterized in that the spring washers ( 16 ) in corresponding receptacles of a spacer film ( 17 ), which breakthroughs ( 18 ) and that under the spacer film ( 17 ) the switching foil ( 19 ) with the associated contacts ( 20 . 21 ) is arranged. Input keyboard according to one of claims 1 to 6, characterized in that the flexible Bohrschutzfolie ( 30 ) also via the spring washers ( 16 ) and the breakthroughs ( 15 ) of the holding foil ( 14 ) is tense. Input keyboard according to one of claims 1 to 7, characterized in that as expansion protection against removal of the lower switching foil ( 19 ) at the bottom of the contact foil ( 5 ) at least one safety contact ( 24 ) is arranged, to the spring-loaded a spring washer ( 25 ) contacting the lower safety contact ( 23 ) on top of the switching foil ( 19 ) is present. Input keyboard according to one of claims 1 to 8, characterized in that on the underside of the contact foil ( 5 ) each contact surfaces ( 9 ) are arranged, the aligned and spring loaded above the respective spring washer ( 16 ) arranged on an underlying, second contact foil ( 12 ) arranged contacts ( 13 ) and that in the assembled state, the upper contact surface ( 9 ) the lower switching contacts ( 13 ) on the contact foil ( 12 ) short, so that in the assembled state, protection against removal of the buttons ( 2 . 3 ) consists. Input keyboard according to claim 9, characterized in that the lower contact foil ( 12 ) with the switch contacts ( 13 ) is so flexible that a corresponding pressure on the respective button ( 2 . 3 ) by the as Bohrschutzfolie ( 30 ) formed first contact foil ( 5 ) and by the underlying second contact foil ( 12 ) directed down the spring washers ( 16 ) elastically deformed and the contacts on the switching foil ( 19 ).