JPH03147578A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To execute servo-track write with high quality by executing write of a servo-disk in using a servo-track write unit having a carriage whose rigidity is higher than that of a carriage for read. CONSTITUTION:Servo-information is read from a servo-disk 36, a carriage 32 is driven, positioning of a head 33 is executed, and read/write of data are executed to a data disk. Also, write of the servo-information to the servo-disk 36 is executed by using a carriage 35 whose rigidity is higher than that of the carriage 32 for read. In such a way, the head does not vibrate even when vibration comes from the outside, etc. and the servo-information of a high quality can be written.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a magnetic disk device that reads servo information from a servo disk, drives a carriage, positions a head, and writes/writes data to/from a data disk. The purpose of the present invention is to provide a magnetic disk device capable of performing quality servo track writing, and is configured to write on the servo disk using a servo track writing unit having a carriage that is more rigid than the carriage.

[Industrial Application Field] The present invention relates to a magnetic disk device that reads servo information from a servo disk, drives a carriage, positions a head, and reads/writes data to/from a data disk.

In recent years, there has been a demand for high-speed access in magnetic disks, and efforts have been made to reduce the weight and moment of inertia of the Yarrow system. Therefore, the rigidity of the carriage system tends to be insufficient, and deterioration in the quality of servo track writing for servo disks has become a problem.

[Prior Art] Next, a conventional example will be explained using the drawings. FIG. 5 is a plan cross-sectional configuration diagram of a conventional magnetic disk device, FIG. 6 is a front cross-sectional configuration diagram in FIG. 5, and FIG. 7 is an explanatory diagram at the time of servo track writing in FIG. 6.

In these figures, 1 is an enclosure that hermetically seals a magnetic disk drive, and 2 is a spindle rotatably provided within the enclosure 1 via a bearing 3 and rotationally driven by a spindle motor 4. A plurality of disks 5 (seven disks in this conventional example) are attached to this spindle 2 via spacers 6. One surface 5a of the middle disk among the plurality of disks 5 is a servo surface on which servo information is recorded.

Reference numeral 7 denotes an actuator shaft rotatably provided within the enclosure 1 using a bearing 8. A head arm assembly 10 is attached to the actuator shaft 7. This head arm assembly 10 is formed with a head arm 10a extending between each disk 5. A head 12 is attached to the tip of each head arm 10a via a spring arm 11.

Further, the head arm assembly 10 is formed with a coil attachment portion 10b to which the coil 13 is attached via the actuator shaft 7.

On the other hand, 14 is a magnetic circuit arranged at a corner of the enclosure 1. This magnetic circuit 14 is composed of a yoke 15 and a magnet 16 attached to this yoke 15, and a magnetic gap 14a is formed. A coil 13 is disposed in this magnetic gap 14a.

Next, the operation of the above configuration will be explained. The disk 5 is rotationally driven by a spindle motor 3 at, for example, 3 [100 rl) III. A control circuit (not shown) is connected to the coil 1.
Apply current to 3. Then, since the coil 13 is disposed between the magnetic gaps 14a of the magnetic circuit 14, the coil 1
A thrust force is generated at the actuator shaft 7, and the head arm assembly 10 performs a swinging motion around the actuator shaft 7. This swinging causes the head 12 to move to the desired track on the disk 5. At this time, the head 12 position is detected while taking in information on the servo surface 5a. This type of servo system is called servo surface servo.

When the head 12 moves to the target track, data is read from/written to the disk 5.

[Problems to be Solved by the Invention] In the conventional example with the above configuration, servo information is written (servo track write, 5TW) on the servo surface 5a during the manufacturing stage.

Here, a conventional servo track writing method will be explained using FIG. In the figure, 21 is a mirror adapter that can be attached to and detached from the actuator shaft 7. A plurality of mirrors 22 are attached to this mirror adapter 21. 23 is a sensor that emits a laser beam to the mirror 22; a laser 24 detects the laser beam reflected by the mirror 22;

Then, the rotation angle of the actuator shaft 7 (head 1
Servo information is written onto the servo surface 5a of the disk 5 using the servo head 12a while the sensor 24 detects the positioning of the disk 5.

However, in recent years, in order to achieve high-speed access in magnetic disk drives, actuator systems have been made lighter and have a smaller moment of inertia. Therefore, the actuator (
It has become difficult to ensure sufficient rigidity of the carriage system. Therefore, there is a problem in that the quality of servo track writing during servo track writing is degraded.

The present invention has been made in view of the above problems, and its object is to provide a magnetic disk device that can perform high-quality servo track writing.

[Means for Solving the Problems] FIG. 1 is a diagram showing the principle of the present invention. In the figure, 31 is an enclosure, and 32 is a carriage for positioning the head 33.

34 is a servo track write unit having a carriage 35 that is more rigid than the carriage, and the carriage 35 of this servo track write unit 34 is used to write servo information on the servo disk 36.

[Function] In the magnetic disk device shown in FIG.
Writing/writing and reading of servo information are performed via the carriage 32.

Since the servo information is written to the servo disk 36 using the highly rigid carriage 35,
High-quality servo information can be written without the head vibrating even in response to external vibrations.

[Example] Next, an example of the present invention will be described using the drawings. Second
The figure is a plan cross-sectional configuration diagram illustrating the servo track write time in an embodiment of the present invention, FIG. 3 is a front cross-sectional configuration diagram in FIG. 2, and FIG. 4 is a front cross-sectional diagram explaining the normal state in FIG. 3. FIG.

In these figures, 41 is an enclosure that hermetically seals the magnetic disk drive, and 42 is a spindle that is rotatably provided in the enclosure 1 via a bearing 43 and is rotationally driven by a spindle motor 44.

A plurality of disks 45 (seven disks in this embodiment) are attached to the spindle 42 via spacers 46 . Then, one of the plurality of disks 45
One surface 45a of the two disks is a servo surface on which servo information is recorded.

47 is an actuator shaft rotatably provided within the enclosure 41 using a bearing 48.

A head arm assembly 50 is attached to the actuator shaft 47. This head arm assembly 50 is formed with a head arm 50a extending between each disk 45. Each head arm 5
A head 52 is attached to the tip of Oa via a spring arm 51.

Further, the head arm assembly 50 is formed with a coil attachment portion 50b to which the coil 53 is attached via the actuator shaft 47.

On the other hand, 54 is a magnetic circuit arranged at a corner of the enclosure 41. This magnetic circuit 54 is composed of a yoke 55 and a magnet 56 attached to this yoke 55, and a magnetic gap 54a is formed. A coil 53 is disposed in this magnetic gap 54a.

In this embodiment, a hole 41a is provided in the side wall of the enclosure 41 on the disk 45 side.

On the other hand, 61 is a head arm (carriage) 6 having higher rigidity than the head arm assembly (carriage) 50.
This is a servo track light unit with 2. A servo head 64 is attached to the head arm 62 via a spring arm 63. This servo track light unit 61 has a built-in mechanism that controls the rotation of the head arm 62 using a laser, as in the conventional example.

This servo track light unit 61 has a servo surface 45
This is used when writing servo information to a. In the normal state, as shown in Figure 4,
Hole 41a is closed using screw 66 and plate 65.

Next, the operation of the above configuration will be explained. First, the servo surface 45a
The case of writing servo information to is explained below.

In this case. The head arm 62 of the servo track light unit 61 is inserted through the hole 41a of the enclosure 41 and set. Then, the head arm assembly head 50 is driven to move the servo head (clock head) 52a to the innermost and outermost positions of the disk 45. At this time, the head arm 2 of the servo track light unit 61 is also moved in conjunction.

Then, the outermost and innermost information (stopper position) is written on the servo surface 45a using the servo head 52a. Next, the information is sent to the servo track light unit 61.
The servo head 64 searches for the stopper, recognizes the stopper position, and writes the servo information using the servo track write unit 61.

Next, the operation in the state shown in FIG. 4 will be explained.

The disk 45 is rotated by the spindle motor 44, for example, 3
It is rotated at 600 rpm. Then, a control circuit (not shown) causes current to flow through the coil 53. Then, the coil 53
is disposed between the magnetic gap 54a of the magnetic circuit 54, a thrust is generated in the coil 53, and the head arm assembly 50 swings around the actuator shaft 7. This swinging causes the head 52 to move to the desired track on the disk 45. At this time, Hera 152
Position detection is performed while taking in information on the servo surface 45a. This type of servo system is called servo surface servo.

When the head 52 moves to the target track, data is read from/written to the disk 45.

According to the above configuration, the servo information is written on the servo surface 45a using the servo track light unit 61, which is more rigid than the head arm assembly 50, so that high quality servo information can be written. Servo track writing is possible.

Note that the present invention is not limited to the above embodiments.

For example, although the above embodiment has been described using a rotating carriage, the present invention is not limited to this, and it goes without saying that the present invention can be applied to a magnetic disk device having a linear carriage.

Further, in the embodiment, the servo track write unit 61 is inserted through the hole 41g, but the invention is not limited to this, and the servo information may be written before the enclosure 41 is sealed.

[Effects of the Invention] As explained above, according to the present invention, a servo track write unit having a carriage having higher rigidity than the carriage is used to perform writing on a servo disk, thereby achieving high quality servo recording. A magnetic disk device capable of track writing can be realized.

[Brief explanation of the drawing]

Fig. 1 is a diagram of the principle of the present invention, Fig. 2 is a plan cross-sectional configuration diagram explaining the servo track writing in an embodiment of the present invention, Fig. 3 is a front cross-sectional configuration diagram of Fig. 2, and Fig. 4 is 3 is a front sectional configuration diagram explaining a normal state, FIG. 5 is a plan sectional configuration diagram of a conventional magnetic disk device, FIG. 6 is a front sectional configuration diagram of FIG. 5, and FIG.
It is an explanatory view at the time of servo track writing in the figure. In Figs. 1 to 4, 31.41 is the enclosure, 32°, 33°, 34°, 35°, and 36°. 50 is a carriage (head arm alignment 2 is a head, 1 is a servo track light unit, 2 is a carriage,

Claims (1)

[Claims] Reading servo information from a servo disk (36),
Drive the carriage (32) to position the head (33) and read/read data from/to the data disk.
In a magnetic disk device that performs writing, a carriage (
Servo track light unit (34) with 35)
A magnetic disk device characterized in that writing is performed on the servo disk (36) using the servo disk.