Patent Description:
Various types of data entry devices are known. <CIT> discloses data entry device where the electrical contact pads <NUM> underlie the domes <NUM> of the contact pad <NUM>, as can be seen in <FIG> thereof (reference signs from this reference). Inter alia it refers to a secure data entry key pad device (POS device) comprising a case-open switch assembly operative to sense when the housing of the device is opened and a tamper indication circuitry in communication with the case-open switch assembly, which is configured to provide an output indicating a possible tampering attempt.

<CIT> belongs to the technical field of improved illumination of keypad devices for mobile phones. The illumination structure uses inorganic EL Material for illuminating a pressed key of the data entry keypad, while being constructed in such a way that oscillation phenomena of the inorganic EL material are avoided when the key is pressed.

The problem is to enable an easier and more cost-efficient structure of the key entry device. The invention is set out in claim <NUM>. Dependent claims <NUM> to <NUM> cover improvements thereof.

The present invention has a key entry device including a housing, a keypad array disposed within the housing and including a plurality of keys, a folded printed circuit board below the keypad array and a key contact array including a plurality of contact pairs, each aligned with one of the plurality of keys, a dome array underlying the keypad array and the key contact array and including a plurality of domes, each aligned with one of the plurality of keys and one of the plurality of contact pairs and a protective enclosure including at least one anti-tamper mesh surrounding the key contact array and the dome array.

In accordance with a preferred embodiment of the present invention the key contact array is formed on a flexible printed circuit substrate and underlies at least one anti-tamper mesh. Additionally, the at least one anti-tamper mesh is also formed on the flexible printed circuit substrate. Additionally or alternatively, the at least one anti-tamper mesh includes a plurality of anti-tamper meshes.

Preferably, the key entry device also includes a plurality of case open switch assemblies located entirely within the protective enclosure and protected thereby.

In accordance with a preferred embodiment of the present invention the key entry device also includes a protrusion array underlying the dome array and including a plurality of protrusions, each aligned with one of the domes, whereby depression of one of the plurality of keys of the keypad array causes a corresponding one of the domes of the dome array to be displaced downwardly and to be deformed by pushing engagement with a corresponding one of the protrusions of the protrusion array into contact with at least one of the contact pairs of the key contact array. Additionally, the depression of one of the plurality of keys causes a corresponding portion of the dome array to be displaced towards a corresponding portion of the protrusion array.

In accordance with a preferred embodiment of the present invention the depression of one of the plurality of keys causes an underside surface of the one of the plurality of keys to be depressed downwardly into downward pushing engagement with a corresponding contact pair of the key contact array, thereby pressing a flat peripheral rim of a corresponding one of the plurality of domes downward in electrical contact
with a conductive ring, being a first one of the contact pair, thus causing a conductive disk, being a second one of the contact pairs, to form an electrical connection with the one of the plurality of domes, thereby forming an electrical connection between the conductive disk and the conductive ring. Additionally or alternatively, the one of the plurality of domes is thereby deformed to be convex at its center when viewed from above due to engagement of a top surface of the one of the protrusions with the one of the domes.

Preferably, the protective enclosure also surrounds the protrusion array. In accordance with a preferred embodiment of the present invention the plurality of case open switch assemblies includes elements integrally formed with the protrusion array. Additionally, the elements are directed in a direction opposite to a direction of the protrusions.

In accordance with a preferred embodiment of the present invention at least one of the plurality of domes has a generally concave orientation as viewed from above prior to key depression and has an at least partially convex orientation as viewed from above upon key depression.

Reference is now made to <FIG> and IB, which are simplified pictorial exploded view illustrations of a machine readable card data entry device, taken in respective downward and upward facing directions, to <FIG>, which is an assembled view of the machine readable card data entry device, and to <FIG>, which is a simplified sectional illustration of the machine readable card data entry device of <FIG>.

As seen in <FIG>, the machine readable card entry data entry device preferably comprises a housing <NUM> including a top housing portion <NUM> and a bottom housing portion <NUM>. Top housing portion <NUM> preferably defines an array <NUM> of key apertures <NUM>. Bottom housing portion <NUM> preferably defines a magnetic card reading slit <NUM> having an aperture <NUM>. Top and bottom housing portions preferably together define a smart card reading slot <NUM>. Bottom housing portion <NUM> defines a plurality of upstanding bosses <NUM>. Top housing portion <NUM> defines a plurality of downward facing bosses <NUM>.

Located within housing <NUM> is an LCD assembly <NUM>. LCD assembly <NUM> may optionally include a touchscreen panel, such as a LCM260-<NUM>-<NUM>-A, manufactured by GIANTPLUS TECHNOLOGY CO. , LTD, <NUM> Industrial Road, Toufen, Miauli, Taiwan.

Also located within housing <NUM>, adjacent slit <NUM>, is a magnetic card reader subassembly <NUM>. Magnetic card reader subassembly <NUM> preferably comprises a magnetic card reader head <NUM>, typically a MSR252-<NUM>-<NUM>-A, manufactured by APOLLO (ZHUHAI) ELECTRONICS CO, Apollo Bldg. , Lan-pu Industrial Area E, Jiuzhou Rd, Zhuhai, China, which is mounted into aperture <NUM>.

Additionally located within housing <NUM> and preferably mounted onto bosses <NUM> and/or bosses <NUM>, as seen particularly in <FIG>, is a security volume assembly <NUM>, which is described hereinbelow in greater detail with reference to <FIG> and within which is defined a security volume. There is provided an electrical connection between magnetic card reader subassembly <NUM>, typically via a flexible cable <NUM> and a connector <NUM>, and circuitry located within security volume assembly <NUM>. There is also provided an electrical connection between LCD assembly <NUM>, typically via a flexible cable <NUM> and a connector <NUM>, and circuitry located within security volume assembly <NUM>.

It is appreciated that a smart card to be read may be inserted via slot <NUM> into operative engagement with an interior of the security volume assembly, as described in detail hereinbelow. Slot <NUM> is aligned with a corresponding smart card read/write slot <NUM> formed in assembly <NUM>.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations of security volume assembly <NUM>, forming part of the machine readable card data entry device of <FIG> & IB, taken in respective downward and upward facing directions.

As seen in <FIG> and <FIG>, the security volume assembly <NUM> comprises a keypad element <NUM>, preferably formed of a resilient material such as rubber. Keypad element <NUM> is preferably a unitary element which defines, on a top surface <NUM> thereof, an array <NUM> of displaceable keys <NUM> which are configured to extend through corresponding array <NUM> of key apertures <NUM> (<FIG>) on top housing element <NUM>.

Keypad element <NUM> may be provided with key covers <NUM>. Each of displaceable keys <NUM> is preferably formed on an underside thereof with a pin <NUM>.

Keypad element <NUM> preferably is provided with eight pins, including six edge pins <NUM> and two interior pins <NUM>. Each of pins <NUM> and <NUM> extend from a bottom surface <NUM> of keypad element <NUM>.

Security volume assembly <NUM> preferably also includes an apertured light guide element <NUM> having apertures <NUM>, <NUM> and <NUM> for accommodating respective pins <NUM>, <NUM> and <NUM>.

Security volume assembly <NUM> preferably additionally includes an array <NUM> of domes <NUM>, which are engaged by pins <NUM> when keys <NUM> are depressed. Domes are mounted, as by adhesive, such as an adhesive layer <NUM>, or by soldering, onto a contact subassembly <NUM>, which is described hereinbelow in detail with reference to Figs. 3A - <NUM>.

Adhesive layer <NUM> includes six apertures, including four edge apertures <NUM>, for accommodating corresponding pins <NUM> and two interior apertures <NUM>, for accommodating pins <NUM>.

Located within security volume assembly <NUM> and forming part thereof is a smart card connector assembly <NUM>, various variants of which are described hereinbelow with reference to <FIG>, which is mounted on a printed circuit board <NUM>.

It is seen there are provided a plurality of tamper detection switch assemblies <NUM>.

Each tamper detection switch assembly <NUM> preferably includes a carbon pill <NUM>, which is fixed to the bottom of pins <NUM> and <NUM>, and a pair of electrical contacts <NUM>, mounted on printed circuit board <NUM>, preferably each including a central conductor <NUM> and at least one circumferential ring <NUM>, which preferably includes an inner ring <NUM> and an outer grounded ring <NUM>, either or both of which may include plural segmented ring portions (not shown).

When the housing is closed and top housing portion <NUM> and bottom housing portion <NUM> are fully engaged, carbon pills <NUM>, fixed to the bottom surfaces of pins <NUM> and <NUM>, are positioned so as to short circuit respective electric central conductors <NUM> and respective at least one circumferential rings <NUM>. Alternatively, carbon pills <NUM> may be replaced by deformable conductive domes.

The printed circuit board <NUM> is formed with a protective anti-tamper mesh <NUM>, which is preferably at least one layer of a dense array of two conductors arranged side by side and is connected to alarm circuitry, described hereinbelow. Printed circuit board <NUM> is also preferably provided with connectors <NUM>, <NUM> and <NUM>, which preferably provide an electrical connection between elements on the printed circuit board <NUM> and flexible cable <NUM>, contact subassembly <NUM> and flexible cable <NUM>, respectively. Connector <NUM> is preferably a Zebra connector.

Printed circuit board <NUM> preferably has mounted thereon a main processor <NUM> and its memory <NUM>, which may contain highly sensitive information, as well as tamper detection and alarm circuitry <NUM>. Tamper detection and alarm circuitry <NUM> may be conventional circuitry which provides an alarm, such as an audio or visually sensible alarm, in response to sensed detection of tampering, evidenced, for example by a short circuit or an open circuit in one or more protective mesh, such as mesh <NUM>. Tamper detection and alarm circuitry <NUM> may also be responsive to tampering for erasing sensitive information and disabling communication of sensitive information.

Preferably, printed circuit board <NUM> is also formed with a plurality of apertures <NUM> for precise parallel spacing between smart card connector assembly <NUM> and printed circuit board <NUM>. Preferably, printed circuit board <NUM> is additionally formed with a pair of apertures <NUM> for receiving bosses <NUM> and/or bosses <NUM>.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations of the contact subassembly <NUM> of the security volume assembly <NUM> of <FIG> & <FIG>, taken in respective downward and upward facing directions, and to <FIG> and <FIG>, which are simplified planar illustrations of two alternatives of a subsequently folded element forming part of the subassembly of <FIG> & <FIG>.

As seen in <FIG> & <FIG>, contact subassembly <NUM> includes a frame <NUM>, which partially surrounds smart card connector <NUM> (<FIG> & <FIG>), and a folded flexible PCB <NUM>, which is wrapped about frame <NUM>. Frame <NUM> includes eight apertures, including six edge apertures <NUM>, for accommodating corresponding pins <NUM> and two interior apertures <NUM>, for accommodating corresponding pins <NUM>.

Folded flexible PCB <NUM> includes eight apertures, including six edge apertures <NUM>, corresponding to apertures <NUM>, for accommodating corresponding pins <NUM>, and two interior apertures <NUM>, corresponding to apertures <NUM>, for accommodating corresponding pins <NUM>.

Folded flexible PCB <NUM> preferably includes an array <NUM> of electrical contacts <NUM>, preferably each including a central conductor <NUM> and at least one circumferential ring <NUM>, which are short circuited by engagement therewith of respective domes <NUM> upon depression of respective keys <NUM> and resulting deformation of domes <NUM> by pins <NUM> of respective keys <NUM>.

Folded flexible PCB <NUM> preferably further includes a protective anti-tamper mesh <NUM>, preferably formed as at least one layer of a dense array of two electrical conductors arranged side by side and coupled to an alarm circuit, which is described hereinbelow.

As seen particularly in <FIG>, an underside of frame <NUM> includes a generally flat main portion <NUM> surrounded on three sides by a U-shaped support portion <NUM>, including a central portion <NUM> and a pair of arms <NUM> and <NUM>, extending perpendicularly therefrom. Arms <NUM> and <NUM> are each also formed with corresponding throughgoing apertures <NUM> and <NUM>, respectively.

Central portion <NUM> may also be provided with a pair of internally threaded apertured bosses <NUM> for accommodating screws (not shown) which connect contact subassembly <NUM> of the security volume assembly <NUM> to PCB <NUM> and which assist in securing zebra connector <NUM> in place.

U-shaped support portion <NUM> has a generally recessed flat bottom surface <NUM>, surrounded by an upstanding peripheral wall <NUM>. Anti-tamper mesh <NUM>, peripheral wall <NUM>, a plurality of internal walls <NUM> and the anti-tamper mesh <NUM> on the printed circuit board <NUM> define a number of protected enclosures <NUM> in which various electronic components, such as magnetic stripe reader connector <NUM> and corresponding connector <NUM>, LCD connector <NUM> and corresponding connector <NUM>, main processor <NUM> and memory <NUM>, which may contain highly sensitive information, such as encryption keys, and tamper detection and alarm circuitry <NUM> may be located. Zebra connector <NUM> (<FIG>) is preferably located between bosses <NUM>, peripheral wall <NUM> and one of internal walls <NUM>.

It is appreciated that anti-tamper mesh <NUM>, generally flat main portion <NUM> and upstanding peripheral wall <NUM> and the anti-tamper mesh <NUM> on the printed circuit board <NUM> together define a protected zone <NUM> in which smart card connector assembly <NUM> is located.

If the main processor <NUM> is a stand-alone secure processor, it may be located outside of a protected zone.

As seen in <FIG>, the folded, flexible PCB <NUM>, here shown in a flat state as indicated by reference numeral <NUM>, includes two layers <NUM> and <NUM>, preferably having respective protective anti-tamper meshes <NUM> and <NUM> along substantially their entire surfaces, each of protective anti-tamper meshes <NUM> and <NUM> being preferably formed of a dense array of pairs of side-by- side conductors which are coupled to tamper detection and alarm circuitry <NUM>.

Layer <NUM> preferably includes array <NUM> of electrical contacts <NUM>, each including each including a central conductor <NUM> and at least one circumferential ring <NUM>, and is formed with edge apertures <NUM> and internal apertures <NUM>. Layer <NUM> also includes conductors <NUM> which connect each circumferential ring <NUM> to a corresponding connector pad <NUM>.

Layer <NUM> preferably includes an array <NUM> of pads <NUM>, each of which underlies central conductor <NUM> and is coupled thereto by a via <NUM>. Each of pads <NUM> is preferably connected by an electrical conductor <NUM> to a corresponding connector pad <NUM>.

Anti-tamper mesh <NUM> preferably substantially surrounds each of electrical contacts <NUM>, as well as edge apertures <NUM> and internal apertures <NUM>, and provides anti-tamper protection thereto. Anti-tamper mesh <NUM> also protects electrical conductors <NUM> from above. This is important since electrical conductors <NUM> normally carry signals representing key presses, which may contain sensitive PIN (Personal Identification Number) information.

Anti-tamper mesh <NUM> preferably substantially surrounds each of pads <NUM>, electrical conductors <NUM> and connector pads <NUM> as well as edge apertures <NUM> and internal apertures <NUM> and provides anti-tamper protection thereto.

As seen in <FIG>, the folded flexible PCB, here shown in a flat state as indicated by reference numeral <NUM>, includes three layers <NUM>, <NUM> and <NUM>. Layer <NUM> may be identical to layer <NUM> of <FIG>.

Layers <NUM> and <NUM> preferably having respective protective anti-tamper meshes <NUM> and <NUM> along substantially their entire surfaces. Each of protective anti-tamper meshes <NUM> and <NUM> is preferably formed of a dense array of pairs of side-by-side conductors which are coupled to tamper detection and alarm circuitry <NUM> via respective connector pads <NUM> and <NUM>. Preferably one of the side-by-side conductors in each pair may be connected to ground, while the other of the side -by- side conductors in each pair may be coupled to a voltage other than ground and preferably carries an anti-tamper signal.

Anti-tamper mesh <NUM> preferably protects array <NUM> of electrical contacts <NUM>, electrical conductors <NUM> and array <NUM> of pads <NUM> and electrical conductors <NUM> from below.

Reference is now made to <FIG>, <FIG>, <FIG>, <FIG>, <FIG> and <FIG>, which are simplified illustrations of steps in folding of folded flexible PCB <NUM> of either of <FIG> & <FIG>.

As seen in <FIG>, prior to folding, flexible PCB <NUM>, is a generally flat multi-layer PCB <NUM> of generally rectangular configuration. Generally flat multi -layer PCB <NUM> preferably includes a main portion <NUM> having formed on an underside surface thereof (in the sense of <FIG>) array <NUM> of electrical contacts <NUM>, each including each including a central conductor <NUM> and at least one circumferential ring <NUM>. Main portion <NUM> is formed with edge apertures <NUM> and internal apertures <NUM>.

Extending outwardly from main portion <NUM> are a pair of forward edge flaps <NUM>, four corner flaps <NUM>, two side edge flaps <NUM>, a connector flap <NUM>, a pair of fold over back flaps <NUM> and a back edge flap <NUM>. It is appreciated that preferably all of the above flaps are provided with anti-tamper meshes along substantially the entire extent thereof.

As seen in <FIG> and <FIG>, frame <NUM> is initially aligned over main portion <NUM>, such that apertures <NUM> and <NUM> of the multi-layer PCB <NUM> are aligned with corresponding apertures <NUM> and <NUM> of the frame <NUM>.

As seen in <FIG>, preferably side flaps <NUM> are folded up over corresponding side edge surfaces of frame <NUM>. As seen in <FIG>, preferably corner flaps <NUM> are folded over both front corner surfaces of frame <NUM> and adjacent portions of peripheral wall surface <NUM> and over corner portions of a back edge surface of frame <NUM>.

<FIG> shows that forward edge flaps <NUM> are folded up over those portions of flaps <NUM> which extend along peripheral wall surface <NUM>. Folded forward edge flaps <NUM> also extend further inwardly along peripheral wall surface <NUM> beyond flaps <NUM>. <FIG> also shows that the connector flap <NUM> and pair of fold over back flaps <NUM> and the back edge flap <NUM> are raised and folded over back surface of frame <NUM>.

<FIG> shows back flaps <NUM> folded over corresponding back portions of peripheral wall surface <NUM> and connector flap <NUM> being double folded so as to be located within one of protected enclosures <NUM> between bosses <NUM>.

There is provided a security volume, which is defined by anti-tamper meshes <NUM> and <NUM>, which encloses at least part of the printed circuit board, at least part of the smartcard connector and a plurality of keypad contacts.

Tamper detection switch assemblies <NUM> extend through apertures in anti-tamper meshes <NUM> and provide further protection for the security volume.

It is also a particular feature of the present invention that the security volume is defined at least in part by a folded single flexible PCB, which provides protection for at least one planar surface of the volume and wherein side folded edges of the PCB provide side edge protection to the enclosure.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations <NUM> of smart card connector assembly <NUM> (<FIG> & <FIG>), of the security volume assembly <NUM> shown in <FIG> & <FIG>, taken in respective downward and upward facing directions, and to <FIG>, which is a simplified assembled view illustration of the subassembly of <FIG> & <FIG> together with printed circuit board <NUM>, shown in <FIG>, cooperating therewith.

As seen in <FIG>, the smart card connector assembly <NUM> includes a generally rectangular slot surface defining element <NUM> typically formed of plastic and including an array of eight apertures <NUM>, each of which accommodates a smart card reading spring contact <NUM>. Each of smart card reading spring contacts <NUM> is coupled to a corresponding electrical edge contact <NUM>. Generally rectangular slot surface defining element <NUM> is preferably formed with depending wall portions <NUM>, <NUM> and <NUM> along three edges thereof.

Adjacent corners of slot surface defining element <NUM> there are side protrusions <NUM>, each of which is formed with a downward facing peg <NUM> having a circumferential wall surface <NUM>. Pegs <NUM> are configured for insertion into apertures <NUM> on printed circuit board <NUM> to provide precise parallel spacing between slot surface defining element <NUM> and printed circuit board <NUM>. Alternatively, protrusions <NUM> may be obviated and pegs <NUM> may be formed on a downward facing surface of slot surface defining element <NUM> adjacent corners thereof. Optionally, additional pegs <NUM> may be included on a downward facing surface of slot surface defining element <NUM>.

An additional spring contact assembly <NUM>, including a spring contact finger <NUM>, is also mounted on slot surface defining element <NUM> and is connected to electrical edge contacts <NUM>. Assembly <NUM> is operative for card entry detection.

Turning particularly to <FIG>, it is seen that slot surface defining element <NUM> is mounted in parallel precise propinquity to printed circuit board <NUM> by inserting pegs <NUM> into apertures <NUM> on printed circuit board <NUM>, thereby defining a smart card read/write slot <NUM>, which corresponds to smart card read/write slot <NUM> (<FIG> & IB).

A significant reduction in the thickness of the smart card reader device is realized by defining slot <NUM> between slot surface defining element <NUM> and printed circuit board <NUM>.

The smart card reader may have an overall thickness of <NUM> from the top surface of the printed circuit board <NUM> to the upward facing surface of slot surface defining element <NUM>.

The smart card connector <NUM> of <FIG> & <FIG> cooperates with printed circuit board <NUM> to define a smart card reading volume into which a smart card is inserted via slot <NUM> for reading thereof.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations <NUM> of smart card connector assembly <NUM> (<FIG> & <FIG>), of the security volume assembly <NUM> shown in <FIG> & <FIG>, taken in respective downward and upward facing directions, to <FIG>, which is a simplified assembled view illustration of the subassembly of <FIG> & <FIG> together with printed circuit board <NUM>, shown in <FIG>, cooperating therewith, and to <FIG>, which is a simplified exploded view illustration of the subassembly of <FIG> and <FIG>.

Adjacent corners of slot surface defining element <NUM> are formed side protrusions <NUM>, each of which is formed with a downward facing peg <NUM> having a circumferential wall surface <NUM>. Pegs <NUM> are configured for insertion into apertures <NUM> on printed circuit board <NUM> to provide precise parallel spacing between slot surface defining element <NUM> and printed circuit board <NUM>. Alternatively, protrusions <NUM> may be obviated and pegs <NUM> may be formed on a downward facing surface of slot surface defining element <NUM> adjacent corners thereof. Optionally, additional pegs <NUM> may be included on a downward facing surface of slot surface defining element <NUM>.

An additional spring contact assembly <NUM>, including a spring contact finger <NUM>, is also mounted on slot surface defining element <NUM>, which is connected to electrical edge contacts <NUM>. Assembly <NUM> is operative for card entry detection.

As distinguished from <FIG>, and as seen particularly in <FIG> and <FIG>, the smart card connector assembly <NUM> of <FIG> also includes an apertured metal underplate <NUM> which provides electrical static discharge and also defines a smart card read/write slot <NUM>, which corresponds to slot <NUM> (<FIG> & IB). Additionally, underplate <NUM> provides enhanced structural integrity to the smart card connector assembly <NUM>.

A pair of springs <NUM> are integrally formed with underplate <NUM> and serve to urge a smart card upwardly such that electrical contacts of the smart card (not shown) engage smart card reading spring contacts <NUM>. Springs <NUM> may also provide electrostatic discharge.

Preferably, underplate <NUM> is formed with a lip <NUM> for engagement with an edge of printed circuit board <NUM>. Additionally, underplate <NUM> is preferably provided with two pairs of side engagement portions <NUM> for engagement with corresponding protrusions <NUM> on wall portions <NUM> and <NUM> of the smart card connector assembly <NUM>.

A significant reduction in the thickness of the smart card reader device is realized by defining slot <NUM> between slot surface defining element <NUM> and metal underplate <NUM>. It may have an overall thickness of <NUM> from the top surface of the printed circuit board <NUM> to the upward facing surface of slot surface defining element <NUM>.

The smart card connector <NUM> of <FIG> & <FIG> cooperates with underplate <NUM> to define a smart card reading volume into which a smart card is inserted via slot <NUM> for reading thereof.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations <NUM> of smart card connector assembly <NUM> (<FIG> & <FIG>) of the security volume assembly shown in <FIG> & <FIG>, taken in respective downward and upward facing directions, and to <FIG>, which is a simplified assembled view illustration of the subassembly of <FIG> & <FIG> together with printed circuit board <NUM>, shown in <FIG>, cooperating therewith.

As seen in <FIG>, smart card connector assembly <NUM> includes a generally rectangular element <NUM>, typically formed of plastic and including an array of eight apertures <NUM>, each of which accommodates a smart card reading spring contact <NUM>. Each of smart card reading spring contacts <NUM> is coupled to a corresponding electrical edge contact <NUM>.

Generally rectangular element <NUM> is preferably formed with depending wall portions <NUM>, <NUM> and <NUM> along three edges thereof and with a slot opening defining edge portion <NUM>.

Formed on an underside surface of element <NUM> are downward facing pegs <NUM>, each having a circumferential wall surface <NUM>. Pegs <NUM> are configured for insertion into apertures <NUM> on printed circuit board <NUM> to provide parallel spacing between element <NUM> and printed circuit board <NUM>. It is seen in <FIG> that a bottom side of element <NUM> includes a main recess <NUM>, which is bordered by raised side portions <NUM> and <NUM>, each of which may have multiple openings, such as those designated by reference numerals <NUM>, <NUM>, <NUM> and <NUM> for accommodating additional components within the security volume assembly <NUM> (<FIG> & IB).

An additional spring contact assembly (not shown), including a spring contact finger (not shown), is also mounted on element <NUM> and is connected to electrical edge contacts <NUM>. This assembly is operative for card entry detection.

As distinguished from <FIG>, and as seen particularly in <FIG> and <FIG>, smart card connector assembly <NUM> of <FIG> also includes an apertured metal underplate <NUM>, which may be molded into element <NUM> and defines the floor of main recess <NUM>.

Underplate <NUM> and element <NUM> together define smart card read/write slot <NUM>, which corresponds to slot <NUM> (<FIG> & IB). Underplate <NUM> may include spring fingers <NUM>, similar to springs <NUM> in the metal plate in <FIG>, which preferably push a smart card located in slot <NUM> into reading engagement with spring contacts <NUM> and may also provide electrical static discharge. Additionally, underplate <NUM> provides enhanced structural integrity to the smart card connector assembly <NUM>. An electrical edge contact <NUM> is connected to metal underplate <NUM> for grounding and electrical static discharge protection.

The keypad element <NUM> and the array <NUM> of domes <NUM>, the array <NUM> of electrical contacts <NUM> and the smart card connector <NUM> are all located on the same side of the printed circuit board <NUM>.

It is a particular feature of the present invention that electrical contacts <NUM> of tamper detection switch assemblies <NUM> are aligned with each one of pins <NUM>
and <NUM> and corresponding apertures <NUM> & <NUM>, <NUM> & <NUM> and <NUM> & <NUM>, such that, in the absence of tampering, carbon pills <NUM> fixed to the bottom surfaces of pins <NUM> and <NUM>, extend through respective apertures <NUM> & <NUM>, <NUM> & <NUM> and <NUM> & <NUM>, into circuit closing engagement with central conductor <NUM> and at least one of at least one circumferential ring <NUM> of electrical contact arrays <NUM>. If the housing is opened, this electrical engagement is interrupted, producing an alarm.

Pins <NUM> and <NUM> extend through at least one protective anti-tamper mesh and thus provide mutual protection.

The protective security anti-tamper mesh <NUM>, which is connected to tamper detection and alarm circuitry <NUM>, protects connections to the various electrical contacts <NUM>, connectors <NUM>, <NUM> and <NUM> and also protects smart card reading spring contacts, <NUM>, <NUM> and <NUM> and electrical edge contacts <NUM>, <NUM> and <NUM> from tampering.

The security volume assembly <NUM> is protected by at least one zebra connector <NUM>, a plurality of tamper detection switch assemblies <NUM> and a multi-layer flexible circuit board <NUM> including at least one protective security anti-tamper mesh <NUM>, which is connected to tamper detection and alarm circuitry <NUM>, and wherein protective security anti-tamper mesh <NUM> protects the plurality of tamper detection switch assemblies <NUM> and zebra connector <NUM> from unauthorized access. Zebra connector <NUM> and the plurality of tamper detection switch assemblies <NUM> together protect the protective security anti-tamper mesh <NUM> from being removed or lifted.

It is appreciated that anti-tamper meshes <NUM> and <NUM> and tamper detection switch assemblies <NUM> are preferably all connected to tamper detection and alarm circuitry <NUM>.

Reference is now made to <FIG> and <FIG>, which are simplified pictorial exploded view illustrations of a machine readable card data entry device constructed and operative in accordance with a preferred embodiment of the present invention, taken in respective downward and upward facing directions, to <FIG>, which is an assembled view of the machine readable card data entry device, and to <FIG>, which is a simplified sectional illustration of the machine readable card data entry device of <FIG>.

As seen in <FIG>, the machine readable card entry data entry device preferably comprises a housing <NUM> including a top housing portion <NUM> and a bottom housing portion <NUM>. Top housing portion <NUM> preferably defines an array <NUM> of key apertures <NUM>. Top housing portion <NUM> preferably defines a magnetic card reading slot <NUM> and an aperture <NUM> communicating with slot <NUM>. Top and bottom housing portions preferably together define a smart card reading slot <NUM>. Bottom housing portion <NUM> defines a plurality of sockets <NUM>. Top housing portion <NUM> defines a plurality of downward facing bosses <NUM>, which engage sockets <NUM>.

Also located within housing <NUM>, adjacent slot <NUM>, is a magnetic card reader subassembly <NUM>. Magnetic card reader subassembly <NUM> preferably comprises a magnetic card reader head <NUM>, typically a MSR252-<NUM>-<NUM>-A, manufactured by APOLLO (ZHUHAI) ELECTRONICS CO, Apollo Bldg. , Lan-pu Industrial Area E, Jiuzhou Rd, Zhuhai, China, which is mounted into aperture <NUM>.

Additionally located within housing <NUM> and preferably mounted onto top housing portion <NUM>, as seen particularly in <FIG>, is a security volume assembly <NUM>, which is described hereinbelow with reference to Figs. Located within security volume assembly <NUM> and forming part thereof is a smart card connector assembly, variants of which are described hereinabove with reference to <FIG>.

There is provided an electrical connection between magnetic card reader subassembly <NUM>, typically via a flexible cable <NUM> and a connector <NUM>, and circuitry located within security volume assembly <NUM>. There is also provided an electrical connection between LCD assembly <NUM>, typically via a flexible cable <NUM> and a connector <NUM>, and circuitry located within security volume assembly <NUM>.

It is appreciated that a smart card to be read may be inserted via slit <NUM> into operative engagement with an interior of the security volume assembly. Slot <NUM> is aligned with a corresponding smart card read/write slot <NUM> formed in assembly <NUM>.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations of security volume assembly <NUM>, forming part of the machine readable card data entry device of <FIG> & <FIG>, taken in respective downward and upward facing directions.

As seen in <FIG> and <FIG>, the security volume assembly <NUM> comprises a keypad element <NUM>, preferably formed of a resilient material, such as rubber. Keypad element <NUM> is preferably a unitary element which defines, on a top surface <NUM> thereof, an array <NUM> of displaceable keys <NUM> which are configured to extend through corresponding array <NUM> of key apertures <NUM> (<FIG> on top housing element <NUM>. Each of displaceable keys <NUM> is preferably formed with an underside surface <NUM>.

Security volume assembly <NUM> optionally also includes an apertured light guide element <NUM> having apertures <NUM> for accommodating keys <NUM>.

Security volume assembly <NUM> additionally includes a folded flexible PCB <NUM>, which is described hereinbelow in detail with reference to <FIG>. Underlying folded flexible PCB <NUM> is a dome assembly <NUM>, which is described hereinbelow in detail with reference to <FIG> and <FIG>. Underlying dome assembly <NUM> is a protrusion array element <NUM>. Protrusion array element <NUM> includes an array of protrusions <NUM> extending upwardly, in the sense of <FIG>, from a corresponding array of recessed surfaces <NUM> arranged with respect to a generally planar surface <NUM>. A plurality of case open switch pins <NUM> extend downwardly, in the sense of <FIG>, from a downwardly facing planar surface <NUM> of element <NUM>.

Folded flexible PCB <NUM>, dome assembly <NUM> and protrusion array element <NUM> are mounted onto a frame <NUM>, which surrounds a smart card connector <NUM>, by folding and wrapping flexible PCB <NUM> over frame <NUM> with dome assembly <NUM> and protrusion array <NUM> being located and retained between folded flexible PCB <NUM> and frame <NUM>. As noted above, smart card connector <NUM> may be any suitable smart card connector, such as those described hereinabove with reference to <FIG>.

Frame <NUM> and smart card connector <NUM> are preferably mounted onto a printed circuit board <NUM>, which is illustrated in <FIG>.

Reference is now made to <FIG> and <FIG>, which are simplified exploded view illustrations of a subassembly <NUM> of the security volume assembly <NUM> of <FIG> & <FIG>, taken in respective downward and upward facing directions. It is seen that subassembly <NUM> comprises folded flexible PCB <NUM>, dome assembly <NUM> and protrusion array element <NUM>, which are together mounted onto frame <NUM>.

An enlargement A in <FIG> shows an entry key contact pad pair <NUM>, including a conductive disk <NUM> and a conductive ring <NUM>, surrounding and insulated from disk <NUM>. The entry key contact pad pair <NUM> forms part of an array <NUM>, which is located on a downward facing surface of folded flexible PCB <NUM>.

An enlargement B in <FIG> shows a dimpled dome <NUM> having a concave overall configuration, as seen in an upward facing view, when a corresponding key is not depressed. Dome <NUM> forms part of an array <NUM>, which forms part of dome assembly <NUM>.

Reference is now made to <FIG>, which is a simplified exploded view generalized illustration of a subsequently folded flexible PCB <NUM> forming part of the subassembly of <FIG> & <FIG> and to <FIG>, <FIG> and <FIG>, which are simplified planar illustrations of the layers of the subsequently folded flexible PCB <NUM> of <FIG>.

As seen generally in <FIG>, the subsequently folded flexible PCB <NUM> includes first and second anti-tamper mesh layers, here designated by reference numerals <NUM> and <NUM>, which overlie contact pad layer <NUM>. It is seen that contact pad layer <NUM> includes downwardly-facing array <NUM> of entry key contact pad pairs <NUM>. It is appreciated that the mesh configurations of the first and second anti-tamper mesh layers <NUM> and <NUM> are preferably as shown generally in <FIG> and <FIG> respectively.

Each of protective anti-tamper meshes <NUM> and <NUM> is preferably formed of a dense array of conductors, which are coupled to tamper detection and alarm circuitry <NUM> on printed circuit board <NUM> (<FIG>). Preferably one of the anti-tamper meshes <NUM> and <NUM> may be connected to ground, while the other of the anti-tamper meshes <NUM> and <NUM> may be coupled to a voltage other than ground and preferably carries an anti-tamper signal.

Turning now to <FIG>, it is seen that entry key contact pad pairs <NUM> of downwardly-facing array <NUM> are connected to zebra connector contacts <NUM> and <NUM>, which are engaged by corresponding zebra connectors <NUM> and <NUM> mounted on printed circuit board <NUM> (<FIG>).

Reference is now made to <FIG>, which is a simplified illustration of a subassembly of the dome assembly <NUM> of <FIG> and <FIG> and includes a downward-facing assembled view and corresponding sectional and exploded views as well as enlargements, and to <FIG>, which is a simplified illustration of a subassembly of the dome assembly <NUM> and includes an upward facing assembled view and a corresponding exploded view.

As seen in <FIG> and <FIG>, the dome assembly <NUM> preferably includes an apertured plastic sheet <NUM>, typically formed of PET and having an array <NUM> of apertures <NUM> whose locations generally correspond to those of keys <NUM> (<FIG>). Array <NUM> preferably includes three rows <NUM> of apertures <NUM>. Strips <NUM> of double sided adhesive are preferably located between rows <NUM> and along most of the periphery of apertured plastic sheet <NUM>. Strips <NUM> are operative to attach the dome assembly <NUM> to the underside of flexible PCB <NUM> at locations intermediate and peripherally of rows of entry key contact pad pairs <NUM> (<FIG> and <FIG>).

Preferably, each of apertures <NUM> is centered about a location of the center of a corresponding entry key contact pad pair <NUM> and is centered about a location of the center of a corresponding protrusion <NUM> (<FIG>).

Dimpled domes <NUM> of array <NUM> (<FIG>) are each arranged in a corresponding aperture <NUM> and are centered with respect thereto, thereby preferably defining a circumferential gap <NUM> between a circumferential edge <NUM> of each dome and a corresponding circumferential edge <NUM> of each corresponding aperture <NUM> in apertured plastic sheet <NUM>.

Dimpled domes <NUM> are supported onto apertured plastic sheet <NUM> by a layer <NUM> of adhesive. As seen clearly in a sectional enlargement forming part of <FIG>, each of domes <NUM> is generally concave as viewed from above and includes a plurality of upwardly facing dimples <NUM> and a generally flat peripheral rim <NUM>.

Domes <NUM> are preferably formed of a conductive metal, such as nickel -plated stainless steel.

Reference is now made to <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, <FIG>, which are simplified illustrations of steps in folding of folded flexible PCB <NUM> in various views.

As seen in <FIG>, prior to folding, flexible PCB <NUM>, is a generally flat multi-layer PCB of generally rectangular configuration. The generally flat multilayer PCB preferably includes a main portion <NUM> having formed on an underside surface thereof (in the sense of <FIG>) array <NUM> of entry key contact pad pairs <NUM> (<FIG>). Main portion <NUM> is formed with a plurality of alignment apertures <NUM>.

Extending respectively forwardly and rearwardly from main portion <NUM> are a forward edge flap <NUM>, forward edge end flaps <NUM> and <NUM> and a rearward edge flap <NUM>, including end flaps <NUM> and <NUM>. Extending from a first side of main portion <NUM> is a first side flap <NUM>, from which extend a first forward side apertured flap <NUM> and a first rearward side flap <NUM>. First forward side apertured flap <NUM> defines an aperture <NUM>. Extending from a second side of main portion <NUM> is a second side flap <NUM>, from which extend a second forward side apertured flap <NUM> and a second rearward side flap <NUM>. Second forward side apertured flap <NUM> defines an aperture <NUM>.

Preferably, extending between main portion <NUM> and forward edge flap <NUM> is at least one fold line <NUM>. Preferably, extending between main portion <NUM> and forward edge end flaps <NUM> and <NUM> are respective at least one fold lines <NUM> and <NUM>. Preferably, extending between main portion <NUM> and rearward edge flap <NUM> is at least one fold line <NUM>. Preferably, extending between rearward edge flap <NUM> and end flaps <NUM> and <NUM> are respective at least one fold lines <NUM> and <NUM>. Preferably, extending across end flaps <NUM> and <NUM> are respective at least one fold lines <NUM> and <NUM>. Preferably, extending across forward edge end flaps <NUM> and <NUM> are respective at least one fold lines <NUM> and <NUM>.

Preferably, extending between main portion <NUM> and first side flap <NUM> is at least one fold line <NUM>. Preferably, extending between first side flap <NUM> and first forward side apertured flap <NUM> is at least one fold line <NUM>. Preferably extending between first side flap <NUM> and first rearward side flap <NUM> is at least one fold line <NUM>. Preferably extending across first forward side apertured flap <NUM> at an edge of aperture <NUM> is at least one fold line <NUM>.

Preferably, extending between main portion <NUM> and second side flap <NUM> is at least one fold line <NUM>. Preferably, extending between second side flap <NUM> and second forward side apertured flap <NUM> is at least one fold line <NUM>. Preferably, extending between second side flap <NUM> and second rearward side flap <NUM> is at least one fold line <NUM>. Preferably, extending across second forward side apertured flap <NUM> at an edge of aperture <NUM> is at least one fold line <NUM>.

As seen in <FIG> and <FIG>, main portion <NUM> is adhered to contact subassembly <NUM> by means of double sided adhesive <NUM>. Protrusion array element <NUM> is mounted onto frame <NUM> and aligned therewith by insertion of the plurality of case open switch pins <NUM> in corresponding apertures <NUM> in frame <NUM>.

As seen in <FIG>, <FIG>, <FIG> and <FIG>, frame <NUM>, which partially surrounds smart card connector <NUM>, also includes a plurality of downwardly directed bosses <NUM>, each associated with a corresponding aperture <NUM>. As seen in <FIG>, <FIG> and <FIG>, frame <NUM> also includes a pair of side apertures <NUM> which accommodate zebra connectors <NUM> and <NUM>, mounted on printed circuit board <NUM> (<FIG>).

Frame <NUM> also includes four upwardly directed alignment pins <NUM> which serve to mutually align flexible PCB <NUM>, contact subassembly <NUM> and protrusion array element <NUM> with frame <NUM>, by extending through respective apertures <NUM>, <NUM> and <NUM> formed in flexible PCB <NUM>, contact subassembly <NUM> and protrusion array element <NUM> respectively, as seen in <FIG>.

As seen particularly in <FIG>, <FIG> and <FIG>, an underside of frame <NUM> includes a generally flat main portion <NUM> surrounded on three sides by a U-shaped support portion <NUM>, including a central portion <NUM> and a pair of arms <NUM> and <NUM>, extending perpendicularly therefrom. Arms <NUM> and <NUM> are each formed with a corresponding downwardly directed boss <NUM>, each associated with a corresponding aperture <NUM>.

U-shaped support portion <NUM> has a generally recessed flat bottom surface <NUM>, surrounded by an upstanding peripheral wall <NUM>. Anti-tamper meshes <NUM> and <NUM>, forming part of flexible PCB <NUM> (<FIG>), peripheral wall <NUM>, a plurality of internal walls <NUM> and the anti-tamper mesh <NUM> on the printed circuit board <NUM> (<FIG>) define a number of protected enclosures <NUM> in which various electronic components mounted on or connected to the printed circuit board <NUM> (<FIG>), such as magnetic stripe reader connector <NUM> and corresponding connector <NUM> (<FIG>), LCD connector <NUM> and corresponding connector <NUM> (<FIG>), main processor <NUM> and memory <NUM>, which may contain highly sensitive information, such as encryption keys, and tamper detection and alarm circuitry <NUM> may be located.

It is appreciated that the anti-tamper mesh <NUM> together with anti-tamper meshes <NUM> and <NUM> provide a protective enclosure which encloses contact subassembly <NUM>, protrusion array element <NUM>, frame <NUM> and smart card connector <NUM>. Preferably the protective enclosure entirely encloses the tamper detection switch assembly <NUM>.

As seen in <FIG>, preferably forward edge flap <NUM>, forward edge end flaps <NUM> and <NUM> and rearward edge flap <NUM>, including end flaps <NUM> and <NUM> are folded up over corresponding side edge surfaces of frame <NUM>.

As seen in <FIG>, first side flap <NUM>, first forward side apertured flap <NUM>, first rearward side flap <NUM>, second forward side apertured flap <NUM>, second side flap <NUM>, second forward side apertured flap <NUM>, and second rearward side flap <NUM> are folded up over corresponding side edge surfaces of frame <NUM>.

It is seen that apertures <NUM> and <NUM> are aligned over correspondingly located bosses <NUM> and case open switch pins <NUM>.

Returning to <FIG> and particularly to the enlargement therein, there is seen an example of a tamper detection switch assembly <NUM>, which preferably includes a carbon pill <NUM>, which is fixed to the bottom of a case open switch pin <NUM>, and a pair of electrical contacts <NUM>, formed on printed circuit board <NUM>, preferably each including a central conductor <NUM> and at least one circumferential conductor <NUM>. Preferably an outer grounded ring <NUM> is also provided. It is appreciated that any of conductors <NUM>, <NUM> and <NUM> may include plural segmented portions (not shown).

When the housing is closed and top housing portion <NUM> and bottom housing portion <NUM> are fully engaged, carbon pills <NUM>, fixed to the bottom surfaces of case open switch pins <NUM>, are positioned so as to short circuit respective electric central conductors <NUM> and respective at least one circumferential conductors <NUM>. Alternatively, carbon pills <NUM> may be replaced by deformable conductive domes.

In accordance with a preferred embodiment of the present invention, the protective anti-tamper mesh <NUM> of printed circuit board <NUM> is formed with a dense array of conductors side by side and is connected to alarm circuitry <NUM>, described hereinbelow.

It is a particular feature of an embodiment of the present invention that the tamper detection switch assembly <NUM> and specifically the case open switch pins <NUM> are entirely enclosed by anti-tamper meshes. This structure is realized by constructing case open switch pins <NUM> as part of the protrusion array element <NUM>, which is located below contact subassembly <NUM> of the security volume assembly <NUM> of <FIG> & <FIG>. In this case, the tamper detection switch assembly is not part of the keypad element <NUM>.

Tamper detection and alarm circuitry <NUM> may be conventional circuitry which provides an alarm, such as an audio or visually sensible alarm, in response to sensed detection of tampering, evidenced, for example by a short circuit or an open circuit in one or more protective mesh, such as mesh <NUM>. Tamper detection and alarm circuitry <NUM> may also be responsive to tampering for erasing sensitive information and disabling communication of sensitive information.

Preferably, printed circuit board <NUM> is also formed with a plurality of apertures <NUM> for precise parallel spacing between smart card connector assembly <NUM> and printed circuit board <NUM>.

Reference is now made to <FIG>, which are simplified illustrations of key engagement operation of the smart card data entry device of <FIG> wherein <FIG> shows a key-not depressed operative orientation and <FIG> shows a key depressed operative orientation. <FIG> are taken along lines XVIA - XVIA in <FIG> but do not include smart card connector <NUM> and printed circuit board <NUM>.

Turning initially to <FIG>, it is seen that in a key-not depressed operative orientation, underside surface <NUM> of key <NUM> is vertically (in the sense of <FIG>) spaced from flexible PCB <NUM> and thus conductive disk <NUM> is vertically spaced from dome <NUM> and more particularly from dimples <NUM>.

Accordingly, there is no electrical contact between conductive disk <NUM> and conductive ring <NUM>. Dome <NUM> is concave when viewed from above, as seen in <FIG>. Typically dome <NUM> and its underlying adhesive layer <NUM> lies on a top surface of protrusion <NUM>.

Claim 1:
Key entry device comprising:
a housing (<NUM>,<NUM>);
a keypad array (<NUM>) disposed within said housing (<NUM>,<NUM>) and
including a plurality of keys (<NUM>);
a folded printed circuit board (<NUM>) below said keypad array (<NUM>) and comprising a key contact array (<NUM>) including a plurality of contact pairs (<NUM>), each aligned with one of said plurality of keys (<NUM>);
a dome array (<NUM>) underlying said keypad array (<NUM>) and said key contact array (<NUM>) and including a plurality of domes (<NUM>), each aligned with one of said plurality of keys (<NUM>) and one of said plurality of contact pairs (<NUM>); and
a protective enclosure comprising at least one anti-tamper mesh (<NUM>,<NUM>) surrounding said key contact array (<NUM>) and said dome array (<NUM>).