A method is provided of operating a card reader having a substantially planar delivery path which lies in a first plane and which extends between a mouth region of the card reader and a data reader portion of the card reader. The method comprises projecting light across the planar delivery path and in a second plane which is substantially parallel to the first plane, detecting light which has been projected across the planar delivery path and in the second plane which is substantially parallel to the first plane, and generating a signal which is indicative of a foreign object being disposed in the planar delivery path in response to the amount of detected light being attenuated.
1. A method of operating a card reader having a substantially planar delivery path which lies in a first plane and which extends between a mouth region of the card reader and a data reader portion of the card reader, the method comprising:
projecting light across the planar delivery path and in a second plane which is substantially parallel to the first plane;
detecting light which has been projected across the planar delivery path and in the second plane which is substantially parallel to the first plane; and
generating a signal which is indicative of a foreign object being disposed in the planar delivery path in response to the amount of detected light being attenuated.
2. A method according to claim 1 , further comprising:
initiating an alarm procedure in response to the signal being generated.
3. A method of operating a card reader having a substantially planar delivery path which lies in a first plane and which extends between a mouth region of the card reader and a data reader portion of the card reader, the method comprising:
projecting light across the planar delivery path and in a second plane which is substantially parallel to the first plane;
reflecting light which has been projected across the planar delivery path and in the second plane which is substantially parallel to the first plane;
detecting reflected light; and
generating a signal which is indicative of a foreign object being disposed in the planar delivery path in response to the amount of reflected light being attenuated.
4. A method according to claim 3 , further comprising:
initiating an alarm procedure in response to the signal being generated.
5. A method of operating a card reader having a substantially planar delivery path which lies in a first plane and which extends between a mouth region of the card reader and a data reader portion of the card reader, the method comprising:
projecting a first light beam across the planar delivery path and in a second plane which is substantially parallel to the first plane;
projecting a second light beam across the planar delivery path and in a third plane which is substantially parallel to the first and second planes;
detecting the first light beam which has been projected across the planar delivery path and in the second plane which is substantially parallel to the first plane;
detecting the second light beam which has been projected across the planar delivery path and in the third plane which is substantially parallel to the first and second planes; and
generating a signal which is indicative of a foreign object being disposed in the planar delivery path in response to at least one of the detected first and second light beams being attenuated.
6. A method according to claim 5 , further comprising:
initiating an alarm procedure in response to the signal being generated.
7. A method according to claim 5 , wherein the signal is generated when both of the detected first and second light beams are attenuated.
8. A method according to claim 5 , wherein the first light beam and the second light beam are different light beams.
9. A method according to claim 8 , wherein each of the first and second light beams has a unique signature associated therewith.