Dynamic magnetic information storage or retrieval – Fluid bearing head support – Disk record
Reexamination Certificate
1997-10-23
2001-02-13
Klimowicz, William (Department: 2754)
Dynamic magnetic information storage or retrieval
Fluid bearing head support
Disk record
Reexamination Certificate
active
06188546
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic disk apparatus, more specifically to a method of electrically connecting a magnetic head, a magnetic head assembly and a magnetic disk apparatus.
As an information age comes, a magnetic disk apparatus becomes essential to a computer or a word-processor. With increase of an amount of information, the magnetic disk apparatus has been requested to have more storage capacity, higher performance and a reduced size. The magnetic disk apparatus is normally composed of a magnetic disk part and a magnetic head part. As the magnetic disk apparatus keeps higher performance and a smaller size, the magnetic head part has been requested to be more accurate and smaller.
The conventional example of the magnetic head assembly used in the magnetic head part will be described with reference to
FIGS. 16 and 17
.
FIG. 16
is a view showing an outer appearance of the conventional magnetic head assembly.
FIG. 17
is an expanded view showing the part around the magnetic head contained in the magnetic head assembly.
A magnetic head
51
of the magnetic head assembly used in the magnetic disk apparatus is composed of a core slider made of ceramics, for example, and a magnetic head element. The magnetic head
51
is fixed on a tabular supporting spring
53
.
A lead wire
55
is connected between the magnetic head element
59
provided in the magnetic head
51
and an electric circuit (not shown). The lead wire
55
is coated by an insulating material such as a resin in a manner to keep it insulated from the metallic supporting spring
53
. The lead wire
55
is then passed through a protective tube
56
, like a vinyl tube and the protective tube
56
is fixed at the supporting spring
53
. The fixing of the protective tube
56
having the lead wire
55
therein is done by mechanical (caulking, for example) means. The lead wire
55
located between the magnetic head element
59
and the protective tube
56
is just coated by an insulating material such as a resin without being protected by the protective tube
56
.
In the above structure, the portion of the lead wire
55
from the magnetic head element
59
to the protective tube
56
is formed to have a predetermined form for reducing the force given by the lead wire
55
against the magnetic head
51
(in other words, minimizing the adverse effect of the lead wire
55
on the magnetic head assembly when the magnetic disk is rotating at fast speed) in order to keep the posture of the magnetic head element
59
against the magnetic disk stable.
As the magnetic disk apparatus becomes smaller in-size and higher in performance, the magnetic head part has been requested to be smaller and more accurate. As such, it is important to keep the lead wire from the magnetic head element as vertically close to the supporting spring as possible, that is, to reduce the vertical mounting space of the lead wire as much as possible. Conventionally, the portion of the lead wire
55
from the magnetic head element
59
to the protective tube
56
fixed at the tip of the supporting spring
53
is formed to have a predetermined form. This forming of the lead wire
55
, therefore, needs horizontal as well as vertical mounting space. This is an impedance to reducing the apparatus in size.
The elasticity of this lead wire
55
has an effect of applying excessive force to the magnetic head assembly when it is used. This results in disadvantageously changing the form of the spring and thereby keeping the position of the magnetic head assembly unstable when it is used.
In fixing the supporting spring
53
on the magnetic head
51
, distortion is caused by hardening or shrinking the bonding agent. The distortion directly gives an adverse effect on the supporting spring
53
and the magnetic head
51
. That is, the distortion causes as tension against the supporting spring
53
and the magnetic head
51
in a manner to keep them warped. The warpage is a factor in displacing the relative position between the magnetic head element
59
and the magnetic disk.
SUMMARY OF THE INVENTION
It is an object of the present invention to stabilize the position of the magnetic head assembly, fix the relative location between the magnetic head element and the magnetic disk, and enhance reliability of the magnetic disk apparatus.
In carrying out the object, a method of electrically connecting the magnetic head assembly composed of the magnetic head and the supporting spring is arranged to directly and electrically connect a terminal composed of a conductive film provided in the magnetic head to a projective electrode on the supporting spring having interconnecting lines (patterns) on the top side thereof.
In the magnetic head assembly arranged to electrically connect the magnetic head with the supporting spring having the interconnecting lines on the top side thereof, the magnetic head is fixed with the supporting spring with the bonding agent in the state that the terminal composed of a conductive film provided in the magnetic head is directly and electrically connected with the projective electrode formed in the supporting spring having the interconnecting lines on the top thereof.
In the magnetic head assembly arranged to electrically connect the magnetic head and the supporting spring having the interconnecting lines on the top thereof, the magnetic head is fixed with the supporting spring with a bonding agent in the state that the terminal provided in the magnetic head is directly and electrically connected with the end terminal formed by bending the free terminal containing the end of the interconnecting line, said end terminal provided with the supporting spring.
Further, the magnetic head assembly is characterized by fixing the magnetic head with the supporting spring having plural netted holes in all or part of the fixed part by using the bonding agent.
Moreover, a magnetic disk apparatus including at least a magnetic disk for magnetically recording or reading out data, a magnetic head assembly for inputting or outputting data as an electric signal through the effect of a magnetic head element, and a driving device for positioning the magnetic head assembly radially with the magnetic disk, uses the magnetic head assembly according to the present invention.
To describe the function of the present invention, in the method for electrically connecting the magnetic head assembly composed of the magnetic head and the supporting spring, the terminal composed of a conductive film, provided in the magnetic head, is directly and electrically connected with a projective electrode provided in the supporting spring having interconnecting lines on the top thereof, and the magnetic head is fixed on the supporting spring with the bonding agent in the state that the terminal composed of a conductive film, provided in the magnetic head, is directly and electrically connected with the projective electrode provided in the supporting spring having the interconnecting lines on the top thereof. This structure makes it possible to eliminate the lead wire formed in a predetermined form extending from the magnetic head to the tube fixed at the tip of the supporting spring, unlike the conventional magnetic head body. Hence, the vertical mounting space occupied by the lead wire may be removed, which makes a contribution to reducing the apparatus in size.
Further, the influences of the wind when the apparatus is in use and of the stiffness of the line on the magnetic head assembly are allowed to be kept constant. Hence, the form of the spring is not changed when the apparatus is in use and the posture of the magnetic head is kept stable, resulting in efficiently and stably reading or writing data.
Moreover, the magnetic head assembly is characterized to fix the magnetic head with the supporting spring having plural netted holes on part or all of the spring with the bonding agent. Hence, those holes serve as relief parts of the bonding agent. Further, the distortion caused by the tension due to shrinkage of the bonding agent when the bonding agen
Fujisawa Masayasu
Fukasawa Katsuya
Hashimoto Kazushige
Nakajima Yasuyuki
Nakamura Shigeo
Antonelli Terry Stout & Kraus LLP
Hitachi , Ltd.
Klimowicz William
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