JP2553716B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A magnetic disk device that reads servo information from a servo disk, drives a carriage, positions a head, and reads / writes data from / to a data disk. The present invention aims to provide a magnetic disk device capable of performing servo track writing, and is configured to perform writing on the servo disk by using a servo track writing unit having a carriage having higher rigidity than the carriage.

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

In recent years, high-speed access has been demanded for magnetic disks, and carriage systems have been reduced in weight and moment of inertia. Therefore, the rigidity of the carriage system tends to be insufficient, and the deterioration of the quality of the servo track write for the servo disk is becoming a problem.

[Prior Art] Next, a conventional example will be described with reference to the drawings. FIG. 5 is a plan sectional configuration diagram of a conventional magnetic disk device, FIG. 6 is a front sectional configuration diagram in FIG. 5, and FIG. 7 is an explanatory diagram during servo track writing in FIG.

In these figures, 1 is an enclosure for enclosing a magnetic disk device, and 2 is a spindle rotatably provided in the enclosure 1 via a bearing 3 and rotationally driven by a spindle motor 4. A plurality of discs 5 (seven discs in this conventional example) are attached to the spindle 2 via spacers 6. Then, one surface 5a of the intermediate disk of the plurality of disks 5 is a servo surface on which servo information is recorded.

Reference numeral 7 denotes an actuator shaft rotatably provided in the enclosure 1 using a bearing 8. A head arm assembly 10 is attached to the actuator shaft 7. This head arm assembly 10 has a head arm 10 extending between the disks 5.
a is formed. At the tip of each head arm 10a,
A head 12 is attached 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 includes a yoke 15 and this yoke 15.
Consists of a magnet 16 attached to the magnetic gap
14a is formed. And this magnetic gap 14a
The coil 13 is provided in the.

Next, the operation of the above configuration will be described. The disk 5 is rotationally driven by the spindle motor 3 at, for example, 3600 rpm. Then, a control circuit (not shown) supplies a current to the coil 13. Then, the coil 13 becomes the magnetic gap 14a of the magnetic circuit 14.
Since it is arranged between them, thrust is generated in the coil 13,
The head arm assembly 10 swings around the actuator shaft 7. This swing causes the head 12
Moves to the target track on the disk 5. At this time, the position of the head 12 is detected while taking in the information of the servo surface 5a. Such a servo system is called a servo surface servo.

Then, when the head 12 moves to the target track, data reading / writing is performed on 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; STW) on the servo surface 5a at the manufacturing stage.

Here, a conventional servo track writing method will be described with reference to 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. Reference numeral 23 is a laser that emits a laser beam to the mirror 22, and reference numeral 24 is a sensor that detects the laser beam reflected by the mirror 22.

The rotation angle of the actuator shaft 7 (head
The servo information is written on the servo surface 5a of the disk 5 by using the servo head 12a while detecting (positioning of 12) by the sensor 24.

However, in recent years, in a magnetic disk device, the weight and the moment of inertia of the actuator system have been reduced for high-speed access. Therefore, it is difficult to sufficiently secure the rigidity of the actuator (carriage) system, and there is a problem that the quality of the servo track write at the time of servo track writing deteriorates.

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

[Means for Solving the Problems] FIG. 1 is a principle view of the present invention. In the figure, 31 is an enclosure, and 32 is a carriage that has a head 33 at one end and positions the head 33.

34 is a servo track write unit having a carriage 35 having higher rigidity than the carriage 32.
Servo information is written in 36.

Writing of servo information is performed after the magnetic disk device is assembled by incorporating the components including the servo disk 36, the carriage 32, and the head 33 in the enclosure 31. Specifically, the servo information is written to the servo disk 36 by inserting the carriage 35 of the servo track write unit 34 through the hole provided in the enclosure 31.

[Operation] In the magnetic disk device shown in FIG. 1, data read / write and servo information read are performed via the carriage 32.

In this magnetic disk device, for writing servo information to the servo disk 36, the components including the servo disk 36, the carriage 32, and the head 33 are incorporated in the enclosure 31 to complete the assembly of the magnetic disk device, and then the enclosure 31 is completed. The high-rigidity carriage 35 of the servo track light unit 34 is inserted into the provided hole.

Therefore, when writing servo information to the servo disk 36, the magnetic disk device is in a state that is as close as possible to the completed product, and writing servo information is the same as when actually operating the magnetic disk device (mechanical operating conditions). Moreover, the carriage 35 having high rigidity can be used for vibrations from the outside without vibrating the head. Therefore, high quality servo track writing is performed.

[Embodiment] Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 2 is a plan sectional configuration diagram for explaining a servo track write in one embodiment of the present invention, FIG. 3 is a front sectional configuration diagram in FIG. 2, and FIG. 4 is a normal state in FIG. It is a front cross-section block diagram.

In these figures, 41 is an enclosure for enclosing a magnetic disk device, and 42 is a spindle rotatably provided in the enclosure 1 via a bearing 43 and rotationally driven by a spindle motor 44. A plurality of disks 45 (7 in this embodiment) are attached to the spindle 42 via a spacer 46. One surface 45a of one of the plurality of disks 45 is a servo surface on which servo information is recorded.

Reference numeral 47 is an actuator shaft rotatably provided in the enclosure 41 using a bearing 48. A head arm assembly 50 is attached to the actuator shaft 47. This head arm assembly 50 has a head arm 50 extending between the disks 45.
a is formed. At the tip of each head arm 50a,
A head 52 is attached via a spring arm 51.

In addition, 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 the corner of the enclosure 41. This magnetic circuit 54 includes a yoke 55 and this yoke 55.
Consisting of a magnet 56 attached to the magnetic gap
54a are formed. The coil 53 is arranged in the magnetic gap 54a.

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

On the other hand, 61 is a head arm (carriage) 62 having a higher rigidity than the head arm assembly (carriage) 50.
It is a servo track write unit having. Servo head to head arm 62 via spring arm 63
64 is installed. As in the conventional example, the servo track write unit 61 has a built-in mechanism for controlling the rotation of the head arm 62 by a laser.

This servo track light unit 61 has a servo surface 45a
It is used when writing servo information to.
And in the normal state, as shown in FIG.
41a is closed using screws 66 and plate 65.

Next, the operation of the above configuration will be described. First, the servo surface 45a
The case of writing servo information in will be described. In this case, the head arm 62 of the servo track light unit 61
Is set by inserting it through the hole 41a of the enclosure 41. Then, drive the head arm assembly 50,
The servo head (clock head) 52a is moved to the innermost and outermost sides of the disk 45. At this time, the head arm 62 of the servo track light unit 61 is also interlocked and moved. Then, the outermost and innermost information (stopper position) is obtained by using the servo head 52a.
Write in. Next, the servo head 64 of the servo track write unit 61 is searched for the information, the stopper position is recognized, and the servo track write unit 61 writes the servo information.

Next, the operation in the state of FIG. 4 will be described. The disk 45 is rotationally driven by the spindle motor 44 at, for example, 3600 rpm. The control circuit (not shown) is the coil 53.
Apply current to. Then, since the coil 53 is arranged between the magnetic gaps 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 moves the head 52 to the target track on the disk 45. At this time, the position of the head 52 is detected while taking in the information of the servo surface 45a. Such a servo system is called a servo surface servo.

Then, when the head 52 moves to the target track, data reading / writing is performed on the disk 45.

According to the above configuration, the writing of servo information on the servo surface 45a is completed by assembling the components including the disk 45, the head arm assembly (carriage) 50, and the head 52 in the enclosure 41 to complete the assembly of the magnetic disk device. A hole in the enclosure 41 later
This is performed by inserting a highly rigid head arm (carriage) 62 of the servo track write unit 61 into 41a.

Therefore, when writing the servo information to the servo surface 45a, the magnetic disk device is in a state as close as possible to the completed product, and the writing of the servo information is performed under the same conditions (mechanical operating conditions) as when the magnetic disk device actually operates. And moreover,
The head arm (carriage) 62 having high rigidity can be used to perform vibrations from the outside without vibrating the head 64. Therefore, high quality servo track writing is performed.

The present invention is not limited to the above embodiment. For example, in the above-described embodiment, the rotary carriage has been described, but the present invention is not limited to this, and it is needless to say that the present invention can be applied to a magnetic disk device having a linear carriage.

[Advantages of the Invention] As described above, in the magnetic disk device of the present invention,
To write the servo information on the servo disk, after assembling the components including the servo disk, carriage and head in the enclosure to complete the assembly of the magnetic disk device, the rigidity of the servo track write unit is set in the hole provided in the enclosure. This is done by inserting a high carriage.

Therefore, when writing the servo information to the servo disk, the magnetic disk device is in a state as close as possible to the completed body, and writing the servo information is the same as the actual operation of the magnetic disk device (mechanical operating condition). Moreover, the carriage having high rigidity can be used for vibrations from the outside without vibrating the head. Therefore, it is possible to realize a magnetic disk device capable of high-quality servo track writing.

[Brief description of drawings]

FIG. 1 is a principle diagram of the present invention, FIG. 2 is a plan sectional configuration diagram for explaining a servo track write in one embodiment of the present invention, FIG. 3 is a front sectional configuration diagram in FIG. 2, and FIG. FIG. 3 is a front sectional configuration diagram for 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 in FIG. 5, and FIG. 7 is FIG. FIG. 6 is an explanatory diagram at the time of servo track writing in FIG. 1 to 4, 31 and 41 are enclosures, 32 and 50 are carriages (head arm assemblies), 33 and 52 are heads, 34 and 61 are servo track write units, 35 and 62 are carriages, and 36 and 45a are Servo disk (servo surface).

Claims (1)

(57) [Claims] 1. A servo disk (36), a carriage (32), and a head (33) provided at one end of the carriage (32).
An enclosure (31) for accommodating at least the servo disk (36), the carriage (32) and the head (33), while reading the information of the servo disk (36) with the head (33). A magnetic disk device for positioning the head (33) by driving the carriage (32), wherein the servo disk (36), the carriage (32), and the head (32) in the enclosure (31). After assembling the components including 33) to complete the assembly of the magnetic disk device, the servo track write unit (34) having higher rigidity than the carriage (32) is inserted through the hole provided in the enclosure (31). A magnetic disk drive in which a carriage (35) is inserted and writing is performed on the servo disk (36).