Head protection device and a card reader having the head...

Details Head protection device and a card reader having the head... Head protection device and a card reader having the head...

2005-01-18

2005-01-18

Faber, Alan T. (Department: 2651)

Dynamic magnetic information storage or retrieval

Recording on or reproducing from an element of diverse utility

Card

C360S061000, C360S063000, C360S066000, C360S068000

Reexamination Certificate

active

06844995

ABSTRACT:
A head protection device in a data recording circuit is disclosed in which write-current of a given level that corresponds to a high or low level of coercive force of the magnetic recording portion of a recording medium is provided as an output and supplied to a magnetic head for data recording and reproduction. The data recording circuit comprises an alternate write-current supply portion for alternately providing, by a suitable current switching means, a low write-current corresponding to a low coercivity magnetic head and a high write-current corresponding to a high coercivity magnetic head, a common output portion for providing data to be recorded using a low current or a high current from the alternate write-current supply portion. The low coercivity magnetic head and the high coercivity magnetic head can be at least electrically switched. A current protection portion for a current switching means is provided so as to prevent generation of high write-current at the alternate write-current supply portion.

REFERENCES:
patent: 6141161 (2000-10-01), Sato et al.
patent: 6574058 (2003-06-01), Aruga et al.

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