A card reader for reading magnetic stripe cards which are manually inserted, and withdrawn, by a user. The card is constrained to follow a path which displaces the card laterally while the card is outside the reader, and before the magnetic stripe reaches a magnetic sensor within the reader. The lateral displacement prevents an illicit magnetic sensor, positioned externally to the reader by a hacker, from reading the magnetic stripe, since the stripe is moving in an incorrect direction while the card is external to the reader.
1. A card reader which reads a data-bearing magnetic stripe on a card comprising:
(a) a housing having a card entry slot;
(b) a magnetic read head located within the housing; and
(c) guide means for
(i) displacing a card laterally with respect to the entrance slot during initial insertion of the card, and prior to engagement of the read head with the magnetic stripe,
ii) terminating the lateral displacing before the magnetic stripe reaches the read head, and then
iii) guiding the magnetic stripe in a path across the read head, which path enables reading of the data by the read head, as insertion continues.
2. A card reader as claimed in claim 1 , wherein the guide means includes a reference edge incorporating an offset arranged to move the card laterally.
3. A card reader as claimed in claim 2 , wherein the offset on the reference edge changes position laterally as the card advances into the reader.
4. A card reader as claimed in claim 2 , in which
i) the offset causes the card to travel at an angle with respect to the path, and
ii) the angle changes as the card moves.
5. A card reader as claimed in claim 2 , wherein the offset is adapted to be different in a withdrawal phase from an insertion phase of a card insertion operation.
6. A card reader as claimed in claim 1 , wherein the guide means comprises a cam guide for varying a path of the card reader.
7. A card reader as claimed in claim 1 , further comprising urging means for ensuring that the card follows a path defined by the guide means.
8. A card reader as claimed in claim 7 , wherein the urging means is resiliently biased towards the guide means.
9. A card reader as claimed in claim 8 , wherein the urging means comprises a spring-loaded member.
10. A card reader as claimed in claim 1 , further comprising a sensor for detecting the presence of a magnetic stripe card.
11. A card reader as claimed in claim 10 , further comprising a second sensor for detecting if an urging means has been tampered with.
12. Card reader according to claim 1 , in which the guide means displaces an inserted card laterally with respect to the entrance slot during withdrawal of the card after the magnetic stripe loses contact with, and retreats from, the read head.
13. Card reader according to claim 1 , in which the magnetic stripe travels without lateral movement across the read head, as the read head collects data from the magnetic stripe during insertion.
14. Card reader according to claim 1 , in which the magnetic stripe travels without lateral movement across the read head, as the read head collects data from the magnetic stripe during withdrawal.
15. A card reader for reading a card bearing a magnetic stripe, comprising:
a) a housing;
b) a magnetic read head within the housing, which reads the magnetic stripe; and
c) a guide system which guides the card past the read head, along a path which causes the magnetic stripe to incorrectly align with any second magnetic read head located outside the housing.
16. A card reader for reading a card bearing a magnetic stripe, comprising:
a) a housing;
b) a magnetic read head within the housing, which reads the magnetic stripe; and
c) a guide system which guides the card past the read head, along a path which requires any additional magnetic read head, located external to the housing, to move as the card moves, in order to read the magnetic stripe.