Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
1999-03-23
2001-07-03
Heinz, A. J. (Department: 2165)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C360S075000
Reexamination Certificate
active
06256164
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a servo track writer for use in a hard disc drive, and more particularly, to a servo track writer for use in a hard disc drive, in which the distance between a clock head unit and the hard disc drive can be maintained constant although the hard disc drive moves by a certain distance apart from the clock head unit due to an external force, to thereby detect a clock signal recorded on the hard disc drive with ease.
2. Description of the Related Art
A hard disc drive is one of larg-capacity auxiliary storage devices which are used in a computer. The hard disc drive is comprised of a plurality of circular discs which are spaced by a predetermined distance apart from and stacked over each other, and a plurality of head arms which are rotatably assembled between the discs, to write information on the discs and read information from the discs.
A single disc includes a plurality of concentric tracks on the surface of it. Each concentric track is divided into one or more sectors in which the data is recorded. Servo information such as a track number, a sector number, a head number (disc number), and position control information is recorded on a certain area of each track. The servo information becomes a reference that information is recorded on the disc or information is read therefrom. A device for recording a clock signal and servo information on the hard disc drive in this way is called a servo track writer.
FIG. 3
is a perspective view of a conventional servo track writer for a hard disc drive. As shown, the servo track writer includes a plate-shaped base member
101
, a hard disc drive
105
which is fixed on the upper surface of the base member
101
by a plurality of fixing members, a clock head unit
107
spaced by a predetermined distance apart from the hard disc drive
105
, and a sliding transfer unit
119
for transferring the clock head unit
107
toward or away from the hard disc drive
105
.
A guide rail
109
is protruded and formed on the base member
101
to guide the clock head unit
107
to slide toward the hard disc drive
105
. A groove which is engaged with the guide rail
109
is formed on the bottom of a support member
185
supporting the clock head unit
107
.
A plurality of discs
113
are spaced apart and stacked over each other in the hard disc drive
105
. A head arm
129
for writing information on the discs
113
or reading information from the discs
113
is rotatably installed between the discs
113
.
On the upper area of the clock head unit
107
is installed a clock head arm
117
for recording and reading out a clock signal on and from the discs
113
which are rotatably loaded.
Also, the sliding transfer unit
119
includes a driving motor
121
fixedly installed on the base member
101
and spaced apart from the clock head unit
107
by a predetermined distance, a ball screw portion
163
which is rotated by the driving motor
121
, and a protruding member
165
extending from the supporting member
164
and threadedly engaged with the ball screw
163
.
Meanwhile, a stopper
167
protruding upward from the base member
101
is disposed between the clock head unit
107
and the hard disc drive
105
. An adjusting screw
169
which contacts the stopper
167
is provided on the supporting member
164
, to limit an access to the hard disc drive
105
when the clock head unit
107
gains access to the hard disc drive
105
.
When the hard disc drive
105
is loaded on the base member
101
to write servo information on discs, two horizontal pressing motors
133
operate to press the hard disc drive
105
toward flexing location bars
131
. Accordingly, the hard disc drive
105
moves horizontally to the top and the right, and securely contacts the side surfaces of the fixing bars
131
. Then, three vertical pressing motors
135
operate to press the hard disc drive
105
vertically to securely contact the upper surface of the base member
101
.
When the hard disc drive
105
is fixed on the base member
101
as in the above structure, the driving motor
121
rotates in order to input a clock signal to the track of the discs
113
provided in the hard disc drive
105
. As a result, the ball screw
163
is threadedly engaged with the ball threads of the protruding member
165
and rotates, to thereby cause the clock head unit
107
to gain access to the hard disc drive
105
. The clock head unit
107
moving toward the hard disc drive
105
does not proceed any more and stops as the adjusting screw
169
connected to the supporting member
164
contacts the stopper
167
. When the clock head unit
107
stops, the clock head arm
117
descends toward the discs
113
and the discs
113
of the hard disc drive
105
rotate. As a result, a clock signal is written on a certain area of a track.
When the discs
113
rotate, the clock head arm
117
detects the clock signal recorded on the particular area of the disc track. As the clock signal is detected, the head arm
129
of the hard disc drive
105
writes servo information on the discs
113
.
Accordingly, the head arm
129
can write servo information only when a clock signal has been detected. In this way, servo information can be recorded on a certain area of the discs
113
.
However, after a clock signal has been recorded on a certain area of the disc track by the clock head arm in the conventional servo track writer, if the hard disc drive is moved by an external force, the clock head arm cannot read the clock signal input to the disc even in the case that servo information tends to be recorded on the disc.
This occurs due to the problem that the distance between the hard disc drive and the clock head unit is varied since the hard disc drive moves independently off the clock head unit. Thus, the whole servo information is recorded on the hard disc drive distortedly, to thereby lower the quality of the hard disc drive.
In addition, since the ball screw in the sliding transfer unit for slidingly transferring the clock head unit is threadedly engaged with the protruding member extended from the support member of the clock head unit, an error in the recording and reading of the clock signal can occur due to a mechanical error such as a backlash.
SUMMARY OF THE INVENTION
To solve the above problems, it is an object of the present invention to provide a servo track writer for use in a hard disc drive, in which the distance between a clock head unit and the hard disc drive can be maintained constant since an adjusting screw installed in a supporting member supporting a clock head unit adaptively contacts the side surface of a hard disc drive functioning as a stopper, although the hard disc drive moves by a certain distance apart from the clock head unit due to an external force, to thereby detect a clock signal recorded on the hard disc drive with ease.
To accomplish the above object of the present invention, there is provided a servo track writer for use in a hard disc drive, having a plate-shaped base member, a hard disc drive fixed on the upper surface of the base member, and a clock head unit spaced by a predetermined distance apart from the hard disc drive, for recording and reading out a clock signal on and from the hard disc drive, respectively, the servo track writer comprising: a sliding transfer unit for transferring the clock head unit toward or far from the hard disc drive; and an adjusting screw which extends from one side of a supporting member supporting the clock head unit toward the hard disc drive and adaptively contacts the side surface of the hard disc drive functioning as a stopper when the clock head unit moves toward the hard disc drive.
Here, a guide rail is protrudingly installed on the base member and a groove engaging with the guide rail is formed on the supporting member of the clock head unit, to thereby cause the clock head unit to slide toward the hard disc drive.
Preferably, the sliding transfer unit comprises a driving motor spaced by a predetermined distance apart from one side of the supp
Burns Doane Swecker & Mathis L.L.P.
Heinz A. J.
Samsung Electronics Co,. Ltd.
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