Dynamic magnetic information storage or retrieval – Head mounting – For shifting head between tracks
Reexamination Certificate
1999-07-22
2001-09-04
Miller, Brian E. (Department: 2754)
Dynamic magnetic information storage or retrieval
Head mounting
For shifting head between tracks
C360S266700, C369S249100
Reexamination Certificate
active
06285530
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a head moving device for moving a head with respect to a disk. Particularly, the invention is concerned with a head moving device having a reduced size of a drive section for driving a head.
2. Description of the Related Art
FIG. 5
is a plan view showing a conventional head moving device
30
and
FIG. 6
is a sectional view taken on line
6
—
6
in FIG.
5
.
In the head moving device
30
shown in
FIG. 5
, a guide shaft
28
is fixed to a chassis (not shown), and a fitting hole (a bearing portion)
26
d
of a moving member
26
is fitted on the guide shaft
28
. The guide shaft
28
is disposed in the radial direction of a disk D and is movable in the same direction.
On the moving member
26
are mounted a head body
27
a
on a 0 side opposed to the lower surface of the disk D and a head body
27
b
on a 1 side opposed to the upper surface of the disk, the head body
27
b
being fixed to the tip of an arm such as a plate spring extending from a support portion
26
a
of on the moving member
26
toward the disk D.
An extending portion
26
b
is integral with the moving member
26
, the extending portion
26
projecting in an L shape sideways from the moving member, as shown in FIG.
6
.
A drive section
31
is disposed sideways of the moving member
26
. Although in
FIGS. 5 and 6
the drive section
31
is disposed on only one side of the moving member
26
, a drive section similar to the drive section
31
is sometimes disposed also on the opposite side of the moving member
26
.
In the drive section
31
, a coil
22
is fixed into a recess
26
c
with use of an adhesive or the like. The recess is formed by both support portion
26
a
and extending portion
26
b.
A generally turned square U-shaped guide portion
24
is provided at the distal end of the extending portion
26
b,
and a recess
24
a
of the guide portion
24
is supported by a sub-guide shaft
29
so as to be slidable with respect to the sub-guide shaft, the sub-guide shaft
29
being provided on the chassis side in parallel with the guide shaft
28
.
A yoke
21
b
is inserted into a coil center hole
22
a
formed inside the coil
22
. Also above the coil
22
is disposed a yoke
21
a.
Both yokes
21
a
and
21
b
are fixed at both ends thereof with screws. A plate-like magnet
23
having approximately the same shape as the yoke
21
a
is attached to the yoke
21
a.
In the head moving device
30
constructed as above, when the coil
22
is energized, a drive force acting in the radial direction of the disk D is generated in the moving member
26
. The moving member
26
is prevented from rotating about the guide shaft
28
by sliding contact of the sub-guide shaft
29
with the recess
24
a
of the guide portion
24
. As the moving member
26
moves, the head bodies
27
a
and
27
b
slide in the radial direction of the disk D while holding the disk therebetween.
However, the following problems have been encountered in the above conventional head moving device
30
.
In the head moving device
30
, if driving sections
31
are disposed on both sides of the moving member
26
, the whole of the device becomes larger in size, but if a driving section
31
is disposed on only one side of the moving member
26
, the entire device can be somewhat reduced in size, as shown in
FIGS. 5 and 6
. However, for stabilizing the balance of the moving member
26
, it is required to use such an expensive component as the sub-guide shaft
29
and thus it is impossible to attain a further reduction of cost.
Besides, as shown in
FIG. 6
, the plate-like shape of the yokes
21
a
and
21
b
is wider in the same planar direction as the disk D, and the coil
22
is also wide planarly. Consequently, as shown in
FIG. 5
, the distance L
2
between a work line of a driving force F generated in the coil
22
(a center line S
1
in the width direction of the coil) and a center line S
2
of the guide shaft
28
becomes very long, so that a planar moment M acting on the center of the moving member
26
during operation becomes very large. As a result, a sliding friction force between the fitting hole (bearing portion)
26
d
of the moving member
26
and the guide shaft
28
becomes large and the motion of the moving member
26
becomes stiff, or the guide shaft
28
and the fitting hole (bearing portion)
26
c
is apt to wear.
SUMMARY OF THE INVENTION
The present invention has been accomplished for solving the above-mentioned problems and it is an object of the invention to provide a head moving device capable of keeping the balance of a moving member stable even without using an expensive component such as a sub-guide shaft, also capable of attaining the reduction in size and weight of the mechanism and further capable of diminishing the moment acting on the moving member.
REFERENCES:
patent: 4630145 (1986-12-01), Thompson et al.
patent: 4873598 (1989-10-01), Negishi et al.
patent: 5032942 (1991-07-01), Kurosawa et al.
patent: 5105419 (1992-04-01), Ogura et al.
patent: 5136446 (1992-08-01), Yamamoto et al.
patent: 5299083 (1994-03-01), Kawada
patent: 5592459 (1997-01-01), Kasahara
patent: 5748410 (1998-05-01), Briggs et al.
patent: 5969908 (1999-10-01), Angellotti
patent: 63-269381 (1988-11-01), None
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Miller Brian E.
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