| 摘要 |
A dynamic card reader adapted for use in reading information magnetically recorded on a card in two rows or tracks parallel to the longer dimension of the card. The information is read as the card is being inserted into the slot by two Hall effect sensors disposed in side-by-side relation at the entrance to the card slot. One row of magnet information generates a data signal and the other row generates a clock signal which is used to strobe the data signal into a shift register. The Hall sensors are connected to the detection circuitry through differentiating capacitors, such that the detection circuitry is responsive to transition of magnetic polarities as the card is inserted into the slot.
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