Secure data entry device
View Patent ↗A secure data entry device including a housing, a keypad mounted in the housing and including a plurality of selectably depressible keys, tampering alarm indication circuitry and at least one electrical conductor located in the housing in operative association with the keypad, the at least one electrical conductor being coupled to the tampering alarm indication circuitry and being arranged such that extraction of at least one of the plurality of selectably depressible keys results in at least one break in the at least one electrical conductor, which causes the tampering alarm indication circuitry to provide a tampering alarm indication.
1. A secure data entry device comprising:
a housing;
a keypad mounted in said housing and including a plurality of protruding selectably depressible keys;
anti-tampering grid tearing elements associated with said keys and operative to tear a flexible, tearable anti-tampering grid upon extraction of a key from said keypad;
tampering alarm indication circuitry; and
at least one electrical conductor located in said housing in operative association with said keypad,
said at least one electrical conductor being formed on said flexible, tearable, anti-tampering grid,
said flexible, tearable anti-tampering grid being formed of a multiplicity of interconnected anti-tampering electrical conductors associated with a flexible substrate which is torn as the result of extraction of at least one of said plurality of protruding selectably depressible keys,
said at least one electrical conductor being coupled to said tampering alarm indication circuitry and being arranged such that extraction of at least one of said plurality of protruding selectably depressible keys from said keypad results in at least one break in said at least one electrical conductor, which causes said tampering alarm indication circuitry to provide a tampering alarm indication.
2. A secure data entry device according to claim 1 and wherein:
each of said plurality of protruding selectably depressible keys includes a key actuation protrusion; and
said flexible circuit board substrate is formed with an array of apertures for accommodating said key actuation protrusions.
3. A secure data entry device according to claim 2 and wherein:
said flexible circuit board substrate is formed with at least one pair of slits arranged adjacent at least one aperture of said array of apertures.
4. A secure data entry device according to claim 3 and also comprising at least one key engagement clip associated with at least one of said plurality of protruding selectably depressible keys.
5. A secure data entry device according to claim 4 and wherein said at least one engagement clip includes:
a base portion, having relatively sharp side edges and an aperture for accommodating one of said key actuation protrusions; and
a pair of generally upstanding side portions, each of said upstanding side portions comprising:
a bent over top edge; and
a pair of bent over side edges.
6. A secure data entry device according to claim 5 and wherein each of said bent over side edges includes a serrated upper edge portion.
7. A secure data entry device according to claim 2 and wherein said key actuation protrusions are formed with transverse apertures formed therein.
8. A secure data entry device according to claim 7 and also comprising at least one cutting element mounted in at least one of said transverse apertures and extending therethrough.
9. A secure data entry device according to claim 8 and wherein said flexible circuit board substrate comprises a portion overlying said at least one cutting element.
10. A secure data entry device according to claim 2 and also comprising at least one locking washer lockingly engaging at least one of said key actuation protrusions.
11. A secure data entry device according to claim 1 and wherein said flexible circuit board substrate is adhered to a bottom surface of said keypad.
12. A secure data entry device according to claim 1 and also comprising a support element and wherein said flexible circuit board substrate is adhered to a surface of said support element.
13. A secure data entry device according to claim 12 and wherein said flexible circuit board substrate is also adhered to a bottom surface of said keypad.