Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record
Reexamination Certificate
2001-09-26
2003-11-04
Tupper, Robert S. (Department: 2652)
Dynamic magnetic information storage or retrieval
Fluid bearing head support
Disk record
Reexamination Certificate
active
06643098
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a head slider, and more particularly, to a head slider, which floats above a rotating medium.
In an information memory storage device that has a medium rotatable at a high speed, a carriage having a head slider at an end thereof and a magnetic circuit rotating the carriage in opposite directions, it is required to further increase a density of record on the medium. In order to increase the record density of the medium, it is necessary to decrease a glide height of the head slider.
2. Description of the Related Art
A conventional head slider
10
is shown in FIG.
1
.
FIG. 1
shows a status that the conventional head slider is under writing or reading a record. A hard disk
20
rotates at a high speed and the head slider
10
floats above the hard disk
20
with a distance a due to air flow
25
induced by a high speed rotation of the hard disk
20
. In addition, in a stop mode, the head slider
10
touches the surface of the hard disk
20
.
The hard disk
20
comprises a magnetic layer
22
on the surface of the substrate
21
and a lubrication layer
23
having a thickness of several nanometers on the surface thereof. The lubrication layer
23
is formed so as to decrease a friction with the head slider
10
at the time of starting rotation of the hard disk
20
, and to improve the durability of the hard disk
20
.
The lubrication layer
23
is formed by applying a lubricant, and thereafter being processed by UV irradiation. A main chain of the lubricant is —(CF2-CF20)n-(CF2-0)m-, and a terminal group of the lubricant is Fomblin Zdol(Ausimont) family.
The head slider
10
comprises a head slider body
11
made from ceramics and a magnetic head part
12
formed in the posterior-extremity surface
11
a
of the head slider body
11
. A slider surface
13
, which faces the hard disk
20
, corresponds to a surface
11
b
on which the ceramics of the head slider body
11
is exposed.
In the combination of the above-mentioned head slider
10
and the hard disk
20
, the floating distance a is about 5 nanometers. The floating distance a is a height of the head slider
10
from the hard disk
20
. 5 nanometers is the lowest limit and it is difficult to make the floating distance smaller than 5 nanometers.
A cause of difficulty in reducing the floating distance is considered to be an adhesion between the slider surface
13
of the head slider
10
and the lubrication layer
23
of the hard disk
20
due to the lubricant of the lubrication layer
23
of the hard disk
20
being transferred to the slider surface
13
of the head slider
10
.
As a method for preventing a transfer of the lubricant of the lubrication layer
23
of the hard disk
20
to the slider surface
13
of the head slider
10
, JP, 6-64869, A discloses a composition of an organic silicone functional group layer which is chemically bonded to a surface of the head slider.
However, since the organic silicone functional group layer has characteristics of generating gas, the generated silicone gas enters between a hard disk and a head slider, which may result in occurrence of a risk of head crash.
SUMMARY OF THE INVENTION
It is a general object of the present invention to provide a head slider and an information memory storage device which solve the above-mentioned problems.
A more specific object of the present invention is to reduce the glide height of the head slider to the hard disk by a distance of sub-nano-orders without adhesion of lubricant layers of the head disk and the medium to each other.
In order to achieve the above-mentioned object, there is provided according to one aspect of the present invention a head slider for recording and playing back signals on a medium while floating on the medium, comprising:
a head slider body; and
a lubrication layer on a slider surface of the head slider body,
wherein a lubricant of the lubrication layer has a main chain structure the same as a main chain structure of a lubricant of a lubrication layer of the medium; and
a terminal group has a structure different from a structure of a terminal group of the lubricant of the lubrication layer of the medium.
Additionally, in the head slider according to the present invention, the main chain of the lubricant of the lubrication layer of the head slider body may be —(CF2-CF20)n-(CF2-0)m-;
the terminal group of the lubricant of the lubrication layer of the head slider body may be selected from a group consisting of Fomblin Zdol family, Fomblin AM 3001(Ausimont) family, Amine family, MORESCO PHOSFANOL(matsumura Oil Research Cort.) family, and Fomblin Tetraol(Ausimont) family; and
the terminal group of the head slider body may be different from the terminal group of the lubricant of the lubricant layer of the medium.
In order to achieve the above-mentioned object, there is also provided according to another aspect of the present invention, an information memory storage device comprising, within a housing having a base, a rotatable medium, a carriage having a head slider at an end thereof, and a magnetic circuit which rotates the carriage in opposite directions, wherein the medium including:
a substrate;
a magnetic layer on the substrate; and
a lubrication layer on a surface of the medium,
wherein the head slider has a head slider body; and
a lubrication layer on a slider surface of the head slider body,
wherein a lubricant of the lubrication layer has a main chain structure the same as the main chain structure of the lubricant of the lubrication layer of the medium and
a terminal group having a structure different from the structure of the terminal group of the lubricant of the lubrication layer of the medium.
Additionally, in the information memory storage device according to the present invention, a main chain of the lubricant of the lubrication layer of the medium may be —(CF2-CF20)n-(CF2-0)m-; and
a terminal group may be selected from a group consisting of Fomblin Zdol family, Fomblin AM 3001 family, Amine family, MORESCO PHOSFANOL family, and Fomblin Tetraol family;
wherein a main chain of the lubricant of the lubrication layer of the head slider may be —(CF2-CF20)n-(CF2-0)m-;
a terminal group is selected from a group consisting of Fomblin Zdol family, Fomblin AM 3001 family, Amine family, MORESCO PHOSFANOL family, and Fomblin Tetraol family; and
the terminal group structure is different from the terminal group of the lubricant of the lubrication layer of the medium.
Additionally, in the information memory storage device according to the present invention, the lubricant of the lubrication layer of the medium has a structure in which X1P(Dow Chemical Company) may be added to Fomblin Zdol family; and
the terminal group of the lubricant of the lubrication layer of the head slider is selected from a group consisting of Fomblin AM 3001 family, Amine family, MORESCO PHOSFANOL family, and Fomblin Tetraol family.
Additionally, in the information memory storage device according to the present invention, the terminal structure of the lubricant of the lubrication layer of the head slider may be Fomblin AM 3001 family.
According to the present invention, the structure of the terminal group of the lubricant of the lubrication layer of the head slider is different from the structure of the terminal group of the lubricant of the medium. Thus, the adhesion does not occur between the lubrication layer of the head slider and the lubrication layer of the medium. As a result, the glide height of the head slider to the medium is reduced by a distance of sub-nano-orders as compared with a case in which no lubrication layer is provided on the head slider and another case in which the same terminal group is provided to the lubrication layer of the hard disk. Thus, the floating height of the head slider to the medium can be decreased. Then, signals can be recorded on the medium in a high density.
In addition, the lubricant of the lubrication layer of the head slider and the lubricant of the lubrication layer of the medium have no characteristics of generating gas. So, the in
Fujistu Limited
Greer Burns & Crain Ltd.
Tupper Robert S.
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