Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record
Reexamination Certificate
2000-12-22
2003-12-02
Tupper, Robert S. (Department: 2652)
Dynamic magnetic information storage or retrieval
Fluid bearing head support
Disk record
C360S235100, C360S236300
Reexamination Certificate
active
06657819
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic recording apparatus provided with a magnetic core adapted to read and write magnetic information while moving relative to a magnetic recording medium which is rotated and, in particular, to a technique which makes it possible to prevent the trailing side corner portion of a slider main body from being brought into contact with the magnetic recording medium when the slider main body flies in an inclined state with respect to the magnetic recording medium.
2. Description of the Related Art
Conventionally, a magnetic recording apparatus having a construction as shown in
FIG. 7
has been known as an information recording apparatus for a personal computer or the like.
In the magnetic recording apparatus M shown in
FIG. 7
, a plurality of disc-like magnetic disk
100
, on which magnetic layers are formed, are rotatably provided on a chassis
101
, and a plurality of magnetic heads
102
are provided so as to be capable of moving relative to the obverse or the reverse side of each of these magnetic disk
100
. Each of these magnetic heads
102
is individually supported by a base
105
through the intermediation of a thin and narrow load beam
103
in the form of a triangular plate and an arm
104
, and this base
105
is rotatably supported on the chassis
101
. That is, in the construction shown in
FIG. 7
, the base
105
rotates to thereby cause the magnetic heads
102
to move radially relative to the magnetic disks
100
, and magnetic information at desired positions on the magnetic disk
100
is read, or magnetic information is written to desired positions on the magnetic disks
100
.
The base
105
rotates around a rotation shaft
106
arranged parallel to the rotation shaft
100
of the magnetic disks
100
to thereby cause the magnetic heads
102
to move radially over (or under) the magnetic disks
100
, whereby the support structure for the base
105
shown in
FIG. 7
is realized. The structure for driving the base
105
shown in
FIG. 7
is a voice coil motor structure in which a voice coil
108
and an electromagnet
109
are combined. Apart from this, a variety of structures are known as base driving mechanisms, such as a drive structure using a linear motor.
FIG. 8
shows the above magnetic head
102
in a condition in which the medium facing side thereof is directed upwardly. This magnetic head
102
mainly comprises a plate-like slider main body
111
consisting of a non-magnetic material such as ceramic, and a magnetic core
112
having a coil portion provided at the center of the end surface at one end of the slider main body
111
. In the slider main body
111
of the magnetic head main body
102
, the inner side of
FIG. 8
is the leading side
113
on the upstream side with respect to the rotating direction, and the near side is the trailing side
115
on the downstream side with respect to the rotating direction. Further, at the end of the leading side
113
of the slider main body
111
, there is formed a protrusion
117
having an inclined surface
116
. Further, main rail portions
118
are formed on both sides of the slider main body
111
, and a sub rail portion
119
is formed at the center of the end portion on the trailing side
115
of the slider main body
111
.
In the magnetic head
102
shown in
FIG. 7
, the rail portions
118
and
119
receive positive pressure by the air flow generated as a result of the rotation of the magnetic recording medium
100
, so that it flies over the obverse or reverse surface of the magnetic recording medium, and in this condition, it reads the magnetic information of the magnetic recording medium
100
or writes magnetic information to the magnetic recording medium
100
.
A flying system called a lamp load system has recently been adopted for use in the magnetic head of conventional magnetic recording apparatus. In this system, a retraction portion having an inclined surface is provided on the side of the rotated magnetic recording medium so as to be spaced apart therefrom, and when the rotation of the magnetic recording medium is stopped, the magnetic head
102
which has been flying over the magnetic recording medium is moved to the retraction portion side by way of the inclined surface of the retraction portion, whereby there is no fear of the magnetic head
102
adhering to the obverse or reverse side of the magnetic recording medium
100
when the rotation of the magnetic recording medium
100
is stopped.
In contrast, in the conventionally used magnetic head of CSS (contact start stop) system, the magnetic head is pressed against the obverse or reverse surface of the magnetic recording medium due to the elastic force of the load beam or the flexure when the rotation of the magnetic recording medium is stopped, so that if both the surface of the magnetic recording medium and the slider portion of the magnetic head are mirror-finished, the magnetic head
102
is liable to adhere to the surface of the magnetic recording medium, and, due to the adhesion, there is a fear of the magnetic head undergoing crashing.
In the magnetic head of the lamp load system described above, the magnetic head is retracted to the side of the magnetic recording medium when the rotation of the magnetic recording medium is stopped, so that there is no fear of the magnetic head undergoing adhesion, and it is possible to provide a magnetic head in which there is little fear of crashing being generated. In the lamp load system, however, there are problems as described below.
In the magnetic head of the lamp load system, the slider main body, which moves in the radial direction of the magnetic recording medium along the inclined surface of the retraction portion to move to the obverse side or the reverse side of the magnetic recording medium, may approach the obverse or reverse side of the magnetic recording medium while maintaining the condition in which it is inclined by a minute angle (approximately 1×10
−5
rad) (the rolling state in which one side with respect to the width direction of the slider main body is above or below). It is to be assumed that the inclination angle of at this time is very minute. However, due to the fact that the magnetic head approaches the magnetic recording medium in an inclined state, there is a possibility of the acute corner portion of the slider main body of the magnetic head being brought into contact with the magnetic recording medium.
For example, in the case of the slider main body
111
of the magnetic head
102
shown in
FIG. 8
, the leading side
113
is greatly spaced apart from the magnetic recording medium
100
due to the air pressure as a result of the rotation of the magnetic recording medium
100
, and the trailing side
115
is somewhat closer to the magnetic recording medium
100
,
50
that when it flies, the end portion on the trailing side
115
of the magnetic head
102
is closest to the magnetic recording medium
102
. However, in a case in which, as described above, the magnetic head
102
transversely approaches the magnetic recording medium
100
in the radial direction along the inclined surface of the retraction portion from the condition in which it is inclined, and then starts to fly, the slider main body
11
is brought into an inclined state in which rolling occurs, and in the initial state in which the flying attitude is assumed, one of the end portions
120
on both sides with respect to the width direction of the trailing side
115
of the slider main body
111
of
FIG. 8
, approaches closest to the surface of the magnetic recording medium
100
, with the result that there is a fear of one end portion
120
being brought into contact with the surface of the magnetic recording medium
100
.
In particular, it is to be assumed that this problem is liable to be generated when an impact or load is applied from outside at the time of lamp loading, in which the flying attitude is assumed after bringing the magnetic head
102
close to the magnetic recording medium
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Tupper Robert S.
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