Loading patent…
AssigneeFujitsu Limited
InventorsNoboru Takada, Chie Takeda, Hiroaki Wakamatsu, Masayoshi Shinohara, Kenji Sato, Kenichi Aoshima
Estimating the term…
There is provided a magnetic recording/reproducing apparatus which has an improved reliability for a reproduced signal by eliminating a deformation in a reproduced signal waveform due to a residual magnetization generated in a magnetic head. The magnetic recording/reproducing apparatus has a magnetic recording medium including a magnetic film to which information is magnetically recorded and a thin-film magnetic head including a magnetic pole and a coil provided around the magnetic pole. A current supplying circuit supplies a current to the coil so that a magnetic state of the magnetic pole is stabilized. The current is supplied to the coil after a recording operation has been completed by the thin-film magnetic head. The current may demagnetize the magnetic pole of the magnetic head, or stabilize the magnetic state of the magnetic pole.
A magnetic recording/reproducing apparatus comprising:
A magnetic recording/reproducing method performed by a magnetic recording/reproducing apparatus comprising:
Dependencies are inferred from the claim text.
Drawings are temporarily unavailable. Open the PDF at USPTO
From the US filing history. Foreign family members aren’t listed.
Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor: arrangements for…
Recording, reproducing, or erasing methods; Read, write or erase circuits therefor: digital recording
Structure or manufacture of heads, e.g. inductive: specially adapted for magnetisations perpendicular to the surface of the record carrier
Digital recording or reproducing: improvement or modification of read or write signals
Term ended 13 Sep 2014 (estimated)
USPTO file history isn’t available for this patent, so only indexed dates are shown.
1. Field of the Invention
The present invention generally relates to a magnetic recording/reproducing apparatus and method, and more particularly to a magnetic recording/reproducing apparatus and method having an improved reliability for a reproduced signal by eliminating a deformation in a reproduced signal waveform due to a residual magnetization generated in a magnetic head.
In recent years, since an amount of information processed by a computer system is increased, information recorded by a magnetic disk apparatus is increased. Downsizing and large recording capacity are desired for the magnetic disk apparatus, and thus a magnetic disk apparatus having a high recording density and a high performance are required.
FIG. 1 is an illustration of an essential part of a conventional magnetic disk apparatus;
FIG. 2A is an illustration for explaining a conventional composite thin-film magnetic head;
FIG. 2B is a partial cross sectional view of the magnetic head shown in FIG. 2A;
A description will now be given of a first embodiment of the present invention.
FIG. 9 is an illustration of a structure of the first embodiment of a magnetic disk apparatus according to the present invention. In FIG. 9, a magnetic disk 61A has a construction the same as that shown in FIG. 1. An inner guard band 61a is an area in which no information is recorded. Additionally, a ring-magnetic-pole induction type thin-film magnetic head 62 has a construction the same as that of the magnetic head shown in FIG. 1.
The first embodiment of the present invention further comprises a head positioning mechanism 63, a head positioning controlling circuit 64 and a recording/reproducing controlling circuit 65 having a current supplying circuit 66. The current supplying circuit 66 is provided for demagnetizing magnetic poles provided in the magnetic head 62.