Dynamic magnetic information storage or retrieval – Head – Core
Reexamination Certificate
2001-11-23
2004-01-27
Watko, Julie Anne (Department: 2652)
Dynamic magnetic information storage or retrieval
Head
Core
Reexamination Certificate
active
06683748
ABSTRACT:
BACKGROUND OF THE INVENTION
Priority is claimed to Patent Application Number 2000-70488, filed n the Republic of Korea on Nov. 24, 2000, the contents of which are herein incorporated by reference.
1. Field of the Invention
The present invention relates to a magnetic head for writing/reading a magnetic signal on/from a recording medium, and more particularly, to a vertical writing type magnetic head having improved top and bottom poles for writing a magnetic signal.
2. Description of the Related Art
In general, an apparatus for writing/reading a magnetic signal on/from a recording medium, e.g., a hard disk drive, includes a magnetic head for writing and reading information. A magnetic head
10
, as shown in
FIG. 1
, is installed in a slider
20
provided at one end of a swing arm
30
, and moves to a track being at a desired position on a recording medium (not shown) by rotation of the swing arm
30
to perform a write or read operation.
FIG. 2
is an enlarged view of the magnetic head
10
shown in FIG.
1
. As shown in
FIG. 2
, the magnetic head
10
includes a magneto-resistive head
14
for reading information and an inductive write head for writing information. The magneto-resistive head
14
reads a magnetic signal written on a recording medium, and the inductive write head including a top pole
11
and a bottom pole
12
for producing a leak of a magnetic flux passing through the recording layer of the recording medium, and a write coil
13
used as a current supply route, writes given information on a recording medium.
The inductive write head affects the quality of a signal written on a recording medium. That is, if inputting by the inductive write head is not clearly performed, reproduction cannot be satisfactorily performed even if the performance of the magneto-resistive head
14
is excellent.
However, in order to increase storage capacity, the recent tendency of recording mediums is toward reduction in the width of a track onto which a magnetic signal is input. Such reduction of the track width makes it necessary to reduce the width (w) of the top pole
11
and bottom pole
12
of the inductive write head for inputting the magnetic signal.
FIG. 3
shows the distribution of a magnetic field produced by a top pole and a bottom pole in a conventional inductive write head, and
FIG. 4
shows the position of tracks and a head in the case where the head has a predetermined skew angle with respect to tracks of a recording medium.
Referring to
FIG. 3
, a magnetic field produced around the top pole infiltrates into either side of the bottom pole from the top pole as the magnetic field increases from both sides of a portion facing the bottom pole. As described above, this magnetic field deviates from the pertinent track and affects adjacent tracks.
As shown in
FIG. 4
, there is a skew angle &thgr; between the head of a swing arm type information recording apparatus and the tracks of a recording medium, which varies according to the position of a head. Most information recording apparatuses are constructed such that the skew angle &thgr; becomes zero at the innermost track. However, at outer tracks, as the track width is reduced, the bottom pole
12
of the head positioned on a given track T
1
overlaps an adjacent track T
2
due to the skew angle &thgr;.
In a vertical writing type magnetic head, the bottom pole
12
erases information from the corresponding track T
1
by vertical magnetism and the top pole
11
writes information. As shown in
FIG. 4
, the top pole
11
and the bottom pole
12
are tilted with respect to the tracks by the skew angle &thgr;, causing the top pole
11
for writing information to be positioned on the pertinent track T
1
and the bottom pole
12
for erasing information to be positioned to overlap the adjacent track T
2
. Thus, during writing of information, the bottom pole
12
erases information from both the pertinent track T
1
and the adjacent track T
2
.
The overlapping of the bottom pole
12
with the adjacent track T
2
becomes more severe as the track density increases, thus becoming a problem in increasing recording density.
SUMMARY OF INVENTION
To solve the above-described problems, it is an object of the present invention to provide a vertical writing type magnetic head which can effectively suppress the effect of a magnetic field on an adjacent track.
It is another object of the present invention to provide a vertical writing type magnetic head which can be used with information recording media of higher density.
To accomplish the above objects, there is provided a vertical writing type magnetic head including a substrate, a bottom pole formed on the substrate, and a top pole aligned with and spaced a predetermined distance apart from the bottom pole, wherein the bottom pole has a narrower width than the top pole.
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patent: 3-8105 (1991-01-01), None
Im Young-hun
Kim Yong-su
Burns Doane , Swecker, Mathis LLP
Watko Julie Anne
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