Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record
Reexamination Certificate
2001-11-20
2003-10-28
Watko, Julie Anne (Department: 2652)
Dynamic magnetic information storage or retrieval
Fluid bearing head support
Disk record
C360S235700
Reexamination Certificate
active
06639756
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic head which is mounted on a hard disk device, etc., and scans a recording surface of the disk by a CSS system or the like and a magnetic head apparatus having the magnetic head thereon, and in particular it relates to a magnetic head capable of achieving reduction in the lift of the magnetic head while enabling the magnetic head to have the floating stability and collisions of the magnetic head with a disk surface to be properly avoided and a magnetic head apparatus having the magnetic head thereon.
2. Description of the Related Art
FIG. 14
is a schematic view of a conventional magnetic head M
1
with a surface
1
facing a recording medium and shown upwardly.
As shown in
FIG. 14
, on an end-face
3
in the trailing side T of a slider S
1
, a magnetic element
13
made of a ceramic material is formed, which comprises a thin-film recovery element utilizing a magnetoresistive effect and an inductive type thin-film recording element. The magnetic element
13
is covered with a protecting layer
4
made of alumina, etc. Furthermore, on an end-face
4
a
in the trailing side T of the protecting layer
4
, terminal parts
5
connected to the magnetic element are formed.
As shown in
FIG. 14
, in the substantially central portion of the slider S
1
in the trailing side T, an ABS face
6
in the trailing side is formed so as to rise from a surface
1
facing a recording medium toward a disk surface. As shown in
FIG. 14
, a gap portion G of the magnetic element
13
is exposed from the ABS face
6
.
Moreover, the slider S
1
shown in
FIG. 14
is provided with rail faces
7
and
7
formed from the leading side R toward the trailing side T so as to rise from the surface
1
facing the recording medium. Both the rail faces
7
and
7
are connected together via a step face
8
raised from the from the surface
1
facing the recording medium so as to have the same height as that of the rail face
7
.
As shown in
FIG. 14
, on end faces of the rail faces
7
and
7
in the trailing side, side ABS faces
9
and
10
are formed which are raised from the surface
1
facing the recording medium so as to have the same heights as that of the ABS face
6
in the trailing side.
Furthermore, in the leading side R, a leading ABS face
11
is also formed which is raised from the step face
8
so as to have the same height as that of the ABS face
6
in the trailing side.
As shown in
FIG. 15
, the magnetic head M
1
is elastically supported by a supporting member formed of a flexure
12
and a load beam
14
from the surface opposite to the surface
1
facing the recording medium.
In the CSS system, the magnetic head M
1
makes in contact with a disk D at the beginning.
Air flows over the disk surface between the disk and the magnetic head M
1
from the leading side R when the disk rotates. Due to this airflow, positive pressure is applied on the ABS faces
6
,
9
,
10
, and
11
so as to float the magnetic head M
1
.
On the other hand, on the surface
1
facing the recording medium surrounded by the rail faces
7
and
7
and the step face
8
, negative pressure is applied so as to absorb the magnetic head M
1
to the disk.
Simultaneously with starting of the disk D, a floating force is applied to the magnetic head M
1
due to the airflow on the disk surface, so that the magnetic head M
1
is floated in an inclined position in which the leading side R is raised from the disk D, and scans the disk surface in a position in that the trailing side T of the magnetic head M
1
is slightly floated from the disk D. In
FIG. 15
, the lift from the disk D to a gap portion G of a magnetic element
13
is indicated by X
1
.
In
FIG. 14
, the face exposing the gap portion G of the magnetic element
13
is the trailing ABS face
6
on which positive pressure is applied, and which is formed the highest from the surface
1
facing the recording medium identically to other ABS faces so that the lift X
1
between the disk face and the gap portion G of a magnetic element
13
can be easily set to be small when the magnetic head M
1
is floated over the disk D. Reduction in the lift X
1
has been demanded with recent increasing of the recording density of the disk D.
However, when there are such advances in the reduction of the lift X
1
, when the magnetic head M
1
is inclined in the pitching direction or rolling direction, an edge
6
c
in the trailing side of the ABS face
6
in the trailing side or corners
6
a
and
6
a
in the trailing side T of the ABS face
6
in the trailing side may collide with the disk D so as to damage the magnetic head M
1
or the disk surface.
In the magnetic head M
1
shown in
FIG. 14
, there has also been a problem that because in regions on both sides of the trailing ABS face
6
in the lateral direction (X-direction in the drawing), the ABS faces
9
and
10
raised from the surface
1
facing the recording medium are formed, especially when the magnetic head M
1
is in a floated position inclined in the rolling direction, the ABS faces
9
and
10
are liable to collide with disk D so as to damage the magnetic head M
1
or the disk surface.
The floated position of the magnetic head M
1
is determined by a balance between three factors, i.e., positive and negative pressures and an elastic force of the supporting member.
As shown in
FIG. 14
, however, because the face exposing the gap portion G of the magnetic element
13
is the trailing ABS face
6
directly raised from the surface
1
facing the recording medium on which the negative pressure is applied, and the height of the trailing ABS face
6
from the surface
1
facing the recording medium is very large, the airflow flowing from the leading side R collides with an end face
6
d
in the leading side vertically extending from the surface
1
facing the recording medium toward the recording medium and the airflow is thereby difficult to be smoothly led to the trailing ABS face
6
, so that the floated position of the magnetic head M
1
is liable to be destabilized by losing the balance between positive and negative pressures and the elastic force.
SUMMARY OF THE INVENTION
Accordingly, in order to solve conventional problems described above, it is an object of the present invention to provide a magnetic head and a magnetic head apparatus using the magnetic head in which reduction of a floating lift of the magnetic head is especially planned while a collision of the magnetic head with a disk surface can be appropriately avoided and furthermore a floated position can be stabilized.
In accordance with a first aspect of the present invention, a magnetic head comprises a slider and a magnetic element disposed on an end face of the slider in the trailing side for writing and/or reading, wherein a plurality of ABS faces are formed on a surface of the slider facing a recording medium so as to rise toward the recording medium and be at the same level as each other, the plurality of ABS faces serving to generate positive pressure, and wherein a surface facing the element is formed on the ABS face in the trailing side so as to further rise toward the recording medium, and a gap portion of the magnetic element is located on the surface facing the element.
In the present invention, because the surface facing the element, in which the gap portion of the magnetic element is located, is formed to rise from the trailing ABS face which is a surface generating positive pressure, the gap portion of the magnetic element can be more properly brought closer to the disk surface, enabling reduction in the lift of a future magnetic head to be achieved.
Moreover, according to the present invention, the surface facing the element can be formed to have a size including at least the gap portion of the magnetic element and to have an area smaller than that of the ABS face, so that even when the magnetic head according to the present invention is inclined in the rolling or pitching direction, trailing edges and corners of the surface facing the element are d
Ishihara Hirohisa
Otsuka Tomoo
Ueda Junsei
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
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