Information recording and reproducing apparatus

Details Information recording and reproducing apparatus Information recording and reproducing apparatus

1987-03-18

1989-01-03

Heinz, A. J.

Dynamic magnetic information storage or retrieval

Automatic control of a recorder mechanism

Controlling the head

360 2, 235449, G11B 2102

Patent

active

047961244

ABSTRACT:
In a conventional cash or credit card, since the magnetization angle between the magnetic head and the recording medium formed on the card is fixed, data recorded on the card can easily be discriminated or copied through a card reader for allowing dishonest use of the card. To overcome these problems, data are written or read on or from the card on the basis of a head motion pattern code recorded at the head area of the recording medium. In operation, the read/write head is moved relative to a moving card in accordance with a head motion signal corresponding to a recorded head motion pattern code so that the magnetization angle between the head and the recording medium is intermittently varied in both data recording and reproducing operations.

REFERENCES:
IBM TDB, vol. 19, No. 10, Mar. '77, pp. 3877-3878; Movable Head/Movable Track Accessing; R. Lissner.

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