Dynamic magnetic information storage or retrieval – Head mounting – Disk record
Reexamination Certificate
1997-02-06
2003-04-15
Davis, David (Department: 2652)
Dynamic magnetic information storage or retrieval
Head mounting
Disk record
Reexamination Certificate
active
06549374
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a magnetic head which is suitable for a hard disc device, a magneto-optical disc device, or other such devices.
2. Description of the Related Art
Currently, rewritable hard disc and magneto-optical disc devices employ a floating-type magnetic head in order to improve reliability.
FIG. 1
illustrates the construction of a typical magneto-optical disc device
1
, with the cabinet removed. The magneto-optical disc device
1
rotates a rewritable magneto-optical disc
11
using a spindle motor
12
. An optical pickup
13
is positioned below the magneto-optical disc
11
, and a floating-type magnetic head
14
is positioned above the disc
11
.
The optical pickup
13
and the floating-type magnetic head
14
are mounted on a movable block
15
, which is attached to a sliding portion
17
of a linear motor
16
. Accordingly, the optical pickup
13
and the floating-type magnetic head
14
can move linearly along the radius of the magneto-optical disc
11
. The optical pickup
13
receives light emitted from an optical block
18
via a prism
19
inside the movable block
15
. The light reflected onto the magneto-optical disc
11
is received via the optical pickup
13
and the prism
19
by the optical block
18
. The spindle motor
12
, the linear motor
16
, and the optical block
18
are fixed on a chassis
20
.
FIG. 2
illustrates an underside view of the floating-type magnetic head
14
with a flexure
24
which works as an cantilever spring-type holder. With the magnetic head
14
, a load beam
22
which works as a flexible arm, is attached to the top of a stabilizing piece
21
, which stabilizing piece
21
is attached to the movable block
15
(FIG.
1
). An opening
23
is formed at the root of the load beam
22
and determines an appropriate spring constant of the load beam
22
. The stabilizing piece
25
of the flexure
24
is attached to the top of the load beam
22
by, for example, spot welding. A slider
28
is attached to a flat-spring-shaped displacement portion
27
which is built onto the underside of the stabilizing piece
25
. A magnet
29
is positioned in the slider
28
, and information is recorded onto the magnetic recording material of the optical-magneto disc
11
using a magnetic field which is generated by the magnet
29
.
Referring to
FIG. 3
, three sides of the displacement portion
27
are cut with an appropriate width and length from the middle of the stabilizing piece
25
, and one end of the displacement portion
27
is combined with the vertical portions
30
of the stabilizing piece
25
. In other words, the displacement portion
27
forms a cantilever spring. Such displacement portion
27
is made thin from, for example, stainless steel, and has a predetermined spring constant. As shown in
FIG. 4
, a projection, for example, an embossed (spherical concaved) portion
31
is formed at the middle of the displacement portion
27
. The embossed portion
31
is in contact with the base
36
of the load beam
22
, and works as a pivot when the slider
28
is floating due to buoyancy F generated by moving air which is produced by the rotation of the optical-magneto-disc
11
. The buoyancy F of the slider
28
is transmitted via the embossed portion
31
to the load beam
22
, and the load beam
22
is thereby displaced due to the buoyancy F, making the floating of the slider stable.
Another floating-type magnetic head
14
(
FIG. 1
) has a straddle-mounted, spring-type flexure
32
as shown in FIG.
5
. The flexure
32
is integrally molded together with the load beam
22
at the end of the load beam
22
. A displacement portion
33
where the slider
28
is attached, is formed onto the middle of the flexure
32
, and both sides of the displacement portion
33
are combined with the ring-shaped frame
35
by hinges
34
A and
34
B. Both sides of the frame
35
, each of which forms a right angle to each of the hinges
34
A and
34
B, respectively, are combined with the load beam
22
by hinges
34
C and
34
D. In other words, the displacement portion
33
is formed into a flat straddle-mounted spring. As shown in
FIG. 6
, the displacement portion
33
is terraced downward with respect to a base
36
and is formed thick by half etching and so on, so that the displacement portion
33
does not interfere with the frame
35
when the displacement portion
33
is rotated due to the buoyancy F of the slider
28
.
As described above, only the one end of the cantilever spring-type flexure
24
(
FIG. 4
) is combined with the stabilizing piece
25
by the vertical portions
30
. Accordingly, with a non-contact start-and-stop-type device, when there is a shock, in particular a vertical shock to the load beam
22
in an aslant rising position on standby, the vertical portions
30
or the displacement portion
27
may be accidentally plastically-bent.
Further, because the straddle-mounted spring-type flexure
32
(
FIG. 6
) is integrally molded together into the load beam
22
, the shape of the flexure
32
is determined according to the shape of the load beam
22
. For example, it is impossible to form the flexure
32
which is wider than the load beam
22
. Moreover, in order to establish the spring constant of the flexure
32
at a predetermined value, the half etching by which the base
36
of the load beam
22
is thinly formed, takes much time and labor. Moreover, the slider
28
does not have a pivot and the buoyancy F is not effective at one point of the slider
28
, and this makes the floating unstable.
OBJECT AND SUMMARY OF THE INVENTION
An object of the present invention is to provide an improved floating-type magnetic head which increases strength and durability against shock, making the floating of the slider more stable.
In one aspect, a floating-type magnetic head according to the present invention is comprised of an arm, a slider, a magnet, and a holder. The arm is positioned slidably along the radius direction of a disc. The slider is attached to the top of the arm and floats due to the movement of air produced by rotation of the disc. The magnet is mounted on the slider. The slider is attached displaceably to the arm by the holder. With such magnetic head, a straddle-mounted spring-type displacement portion is formed on the holder which is constructed separately from the arm. A projection is built on the displacement portion so as to be in contact with the arm in order to work for a pivot of the displacement portion.
In another aspect, a floating-type magnetic head according to the present invention is comprised of an arm, a slider, a magnet, and a holder. The arm is positioned slidably along the radius direction of a disc. The slider is attached to the top of the arm and floats due to the movement of air produced by rotation of the disc. The magnet is mounted on the slider. The slider is attached displaceably to the arm by the holder. With such magnetic head, a straddle-mounted spring-type displacement portion is formed on the holder which is constructed separately from the arm. A projection is built onto the arm so as to be in contact with the displacement portion in order to work as a pivot for the displacement portion.
In still another aspect, a floating-type magnetic head according to the present invention is comprised of an arm, a slider, a magnet, and a holder. The arm is positioned slidably along the radius direction of a disc. The slider is attached to the top of the arm and floats due to the movement of air produced by rotation of the disc. The magnet is mounted on the slider. The slider is attached displaceably to the arm by the holder. With such magnetic head, a straddle-mounted spring-type displacement portion is formed onto the holder which is integrally molded together with the arm. A projection is built onto the displacement portion, in order to work as a pivot of the displacement portion. A contact portion is attached to the arm so as to be in contact with the projection.
In yet another aspect, a floating-type magnetic head according to th
Enomoto Kenji
Ikeda Naoto
Davis David
Kananen, Esq. Ronald P.
Rader & Fishman & Grauer, PLLC
Sony Corporation
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