JP2000331393A - Relative position adjusting disk between magnetic head and optical head, and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the positional accuracy of the magnetic signal of a relative position adjusting disk between a magnetic head and an optical head, used during assembling, in a disk device for performing servo control for the magnetic head by using the optical head, for a magnetic head having an optical track and a magnetic track. SOLUTION: On a relative position adjusting disk 12, key-like scratches 20 and 16 are respectively formed on concentric circles 13 and 14 equal to a distance D1 between a magnetic head to be adjusted and an optical spot to be irradiated by the an optical head, and on the key-like scratch 20, a magnetic signal is recorded by a magnetic head wider than the magnetic head to be adjusted. Thus, two magnetic signals 21 and 22 point-symmetrical to each other are recorded with respect to a fixed point on the concentric circle 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk drive for performing servo control of a magnetic disk having an optical track and a magnetic track by using the optical head. The present invention relates to a relative position adjustment disk for a magnetic head and an optical head used for easily and precisely adjusting a general mounting position and a method for manufacturing the same.

[0002]

2. Description of the Related Art A floppy disk drive for performing servo control of a magnetic head using an optical head has a magnetic signal 2 on a light-reflecting disk 1 as shown in FIG.
And a stitch 3 formed by scratching (scratching) the surface of the disk 1 so as to form a concentric circle with respect to the center 4 of rotation of the disk. Is read by the optical head 6 fixed to the magnetic head carriage 5,
Similarly, the magnetic head 7 fixed to the magnetic head carriage 5 in a fixed positional relationship with the optical head 6 performs servo control so as to read and write the magnetic signal 2 on the magnetic track paired with the optical track. See JP-A-2-14436.

When the optical head 6 follows the stitch 3, the positional relationship between the optical head 6 and the magnetic head 7 is determined so that the magnetic head 7 reads and writes the magnetic signal 2 correctly. Are correctly positioned by the positional relationship defined by

Conventionally, in order to adjust the positional relationship between the optical head 6 and the magnetic head 7 on the magnetic head carriage 5, a magnetic track on which a magnetic signal has been recorded by a drive in advance and a reproduction signal of the optical head 6 have been used. The relative position of the information to be changed is adjusted by using a relative position adjustment disk formed equal to the relative position between the magnetic head 7 to be adjusted and the light spot irradiated by the optical head 6. .

[0005] Specifically, the conventional relative position adjusting disk for the magnetic head and the optical head has a relative position as shown in the plan view of Fig. 3A and the enlarged view of the L part of Fig. 3B. A magnetic signal 9 pre-recorded concentrically by a drive over a circumference on a position adjustment disk 8 and a scratch 10 for changing the reproduction signal of the optical head 6 are combined with the magnetic head 7 to be adjusted and the optical head 6. Are formed so as to have the same relative positional relationship with the light spot to be irradiated. The accuracy of the drive for recording the magnetic signal 9 is on the order of several μm, whereas the accuracy of the laser servo writer for processing the scratch 10 is Since the unit is in nm, the accuracy of the recording position of the magnetic signal 9 recorded by the drive was not sufficient.

Reference numeral 11 denotes a stitch which is formed concentrically with the magnetic signal 9 and the scratch 10 on the relative position adjustment disk 8 over one round and supplies a reproduction signal to the optical head 6.

Further, since the magnetic signal 9 and the scratch 10 for changing the reproduction signal of the optical head 6 are formed over one round of the relative position adjusting disk 8, the relative position adjusting disk 8 is mounted on a drive and rotated. And the position of the magnetic signal 9 and the position of the scratch 10 change due to the influence of the eccentricity of the relative position adjustment disk 8 and the eccentricity of the drive, so that an error in the relative position adjustment between the magnetic head 7 and the optical head 6 has occurred. .

[0008]

One of the methods for improving the storage capacity of a floppy disk drive is to increase the magnetic track density. In order to realize this, the optical system constituting the optical head and the components constituting the magnetic head and the magnetic head carriage on which the optical head is mounted are also reduced in size, and there is a demand for assembling the components with higher precision.

However, it has become difficult to assemble the magnetic head and the optical head on the magnetic head carriage within the standard with the accuracy of the conventional relative position adjustment disk.

[0010]

According to the present invention, in order to solve the above problems, an optical track is followed by an optical head, so that a magnetic track paired with the optical track is formed on the magnetic track.
In a disk drive that performs servo control so that a magnetic signal can be read and written by a magnetic head, a relative position used to adjust a relative position between the magnetic head and a light spot emitted from the optical head during assembly. An adjustment disk, which stores a magnetic track on which a magnetic signal is recorded in advance and information giving a local change to a reproduction signal of the optical head, relative to a magnetic head to be adjusted and a light spot irradiated by the optical head. Along the circle that constitutes the magnetic track on the relative position adjustment disk.
A relative position adjustment disk on which two magnetic signals are recorded point-symmetrically over a certain angular range of the circle and circumferentially shifted with respect to a fixed point on the circle, and recording of magnetic signals constituting a magnetic track. Position accuracy can be increased,
Therefore, the accuracy of the relative position adjustment disk is improved, and no error occurs in the adjustment of the relative position between the magnetic head and the optical head to be adjusted.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, an optical track is followed by an optical head, so that a magnetic signal is transmitted to a magnetic track paired with the optical track. In a disk device that performs servo control so that it can be read and written, a relative position adjustment disk used to adjust the relative position of a magnetic head and a light spot emitted from an optical head during assembly. A magnetic track on which a magnetic signal is recorded in advance and information giving a local change to a reproduction signal of the optical head are formed in the same manner as the relative positional relationship between the magnetic head to be adjusted and the light spot irradiated by the optical head. Then, along the circle constituting the magnetic track on the relative position adjustment disk, over a certain angular range of the circle, and circumferentially displaced from a fixed point on the circle by 2 degrees. Is a relative position adjustment disk in which the magnetic signals are recorded in a point symmetric manner over a certain angular range of a circle constituting a magnetic track, and two magnetic signals are shifted from a fixed point on the circle in a circumferential direction. Since the recording is performed symmetrically, there is no adverse effect due to the eccentricity of the relative position adjustment disk or the like, and the reproduced signals of the two magnetic signals are compared at the time of recording the magnetic signals, and the recording is performed so that the two signals are equal. Has the effect that a magnetic signal can be accurately recorded on a circle constituting a magnetic track.

According to a second aspect of the present invention, there is provided a magnetic head having a magnetic track on both sides of a relative position adjustment disk over a certain angular range of the circle and in a circumferential direction with respect to a fixed point on the circle. 2. The relative position adjustment disk according to claim 1, wherein a magnetic track is formed by recording a magnetic signal on the two scratches formed point-symmetrically by shifting the magnetic signal with a magnetic head having a wider recording width than the magnetic head to be adjusted. A magnetic signal having a wider recording width than a magnetic head to be adjusted is provided on two scratches formed in a point symmetric manner with respect to a fixed point on a circle constituting a magnetic track in a circumferential direction. Has the effect that two magnetic signals can be recorded symmetrically with respect to a fixed point on the circle constituting the magnetic track in the circumferential direction.

According to a third aspect of the present invention, a point is formed along a circle constituting a magnetic track over a certain angular range of the circle and in a circumferential direction with respect to a fixed point on the circle. 2. The relative position adjustment disk according to claim 1, wherein two magnetic signals recorded symmetrically are recorded on both sides of the circle, respectively, and two magnetic signals are recorded on both sides of the circle respectively. This has an effect that a sufficient output signal level can be obtained when the magnetic head is accurately on-track at the position of the magnetic signal.

According to a fourth aspect of the present invention, there is provided the relative position adjusting disk according to the first aspect, wherein magnetic signals for discriminating the direction of the magnetic head are recorded on both sides of a circle constituting the magnetic track. The direction discriminating magnetic signal has a function of moving the magnetic head upward or downward according to the position of the magnetic head, and shortens the moving time for on-tracking the magnetic head to the position of the magnetic signal. It has the effect of being able to.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. (Embodiment) FIG. 2A is a plan view of a relative position adjusting disk for a magnetic head and an optical head according to an embodiment of the present invention, and FIG. FIG. 4 is an enlarged view showing a magnetic head 7 (in FIG. 1) to be finally adjusted and an optical head 6 on a relative position adjustment disk 12.
Among the concentric circles 13 and 14 having a distance D1 equal to the distance from the light spot to be irradiated (in FIG. 1), the magnetic head 7 extends over a certain angular range on the concentric circle 13.
A magnetic signal 15 for adjusting the position of the optical head 6 is recorded, and a scratch 16 for adjusting the position of the optical head 6 is formed on the concentric circle 14 over a fixed angular range. Reference numeral 11 denotes a stitch for providing a reproduction signal to the optical head 6.

The method for accurately recording the magnetic signal 15 on the concentric circle 13 is as follows. , Two scratches 17 and 18, which are circumferentially displaced from the fixed point on the concentric circle 13, over the angular range of
Key-like scratch 2 consisting of a scratch 19 that joins
0 is formed point-symmetrically with a high-precision laser servo writer, and then the magnetic signal 15 is recorded on the key-shaped scratch 20 with a magnetic head having a wider recording width than the magnetic head 7 finally adjusted. .

By recording the magnetic signal 15 in this manner, the magnetic signal 15 is
And two point-symmetric magnetic signals 21 and 22 which are shifted in the circumferential direction with respect to a fixed point on the concentric circle 13.

On the relative position adjusting disk 12,
Magnetic signals 23 and 24 for direction determination of the magnetic head 7 are recorded on both sides of the concentric circle 13 on which the magnetic signal 15 is recorded.

When recording by the above method, the magnetic signal 15 is accurately recorded on the concentric circle 13 by comparing the magnitudes of the magnetic signals 21 and 22 on both sides of the concentric circle 13 and recording the magnetic signals 21 and 22 so that they are equal. Will be recorded.

Next, a method for adjusting the relative position between the magnetic head 7 and the optical head 6 using the relative position adjusting disk 12 configured as described above will be described. First, the relative position adjustment disk 12 is rotated to set the magnetic head 7 to be adjusted in the reproducing state, and the magnetic head carriage 5 on which the magnetic head 7 to be adjusted is mounted is moved radially on the relative position adjustment disk 12. Let them seek. A magnetic signal 21 and a magnetic signal 22 recorded at a predetermined frequency are detected by the magnetic head 7,
By fixing the magnetic head 7 on the magnetic head carriage 5 at a position where the reproduced signal amplitudes of the magnetic signal 21 and the magnetic signal 22 become the same, the magnetic head 7 can be accurately on-track at the position of the magnetic signal 15. it can.

Incidentally, the scratches 17 and 1 of the key-shaped scratch 20 which are respectively separated from the concentric circle 13 by a predetermined distance D2
The magnetic signals 21 and 22 recorded on the magnetic disk 8 are recorded on both sides of the concentric circle 13, and the magnetic signals 21 and 22 have an offset, so that the magnetic head 7 is accurately on-track at the position of the magnetic signal 15. In this case, a sufficient output signal level can be obtained.

Further, the magnetic signals 7 and 24 for determining the direction of the magnetic head 7 are
2B, the magnetic head 7 is moved downward in FIG. 2B, and when it is in the direction discrimination magnetic signal 24, the magnetic head 7 is moved upward in FIG. 2B. The seek time of the magnetic head carriage 5 and the moving time for moving the magnetic head 7 to the on-track position of the magnetic signal 15 can be reduced.

Next, while the magnetic head 7 on-tracked on the magnetic signal 15 as described above is fixed on the magnetic head carriage 5, the relative position adjusting disk 12 is rotated in the same manner as described above, and the magnetic head carriage 5 The light spot of the optical head 6 mounted thereon is sought in the radial direction on the relative position adjustment disk 12 to detect a scratch 16 for adjusting the position of the optical head 6, and the reproduction signal amplitude of the optical head 6 reaches the maximum. By fixing the optical head 6 on the magnetic head carriage 5 at a certain position, the magnetic head carriage 5
The distance between the magnetic head 7 and the optical head 6 can be adjusted to the distance D1 which is the distance between the magnetic signal 15 and the scratch 16 on the relative position adjusting disk 12.

Since both the magnetic signal 15 and the scratch 16 on the relative position adjusting disk 12 are provided not in the entire circumference of the relative position adjusting disk 12 but only in a certain angle range, the relative position adjusting disk 12 Due to the influence of the eccentricity and the eccentricity of the drive, the positions of the magnetic signal 15 and the scratch 16 do not change, and the error of the relative position adjustment between the magnetic head 7 and the optical head 6 does not occur.

[0025]

As described above, according to the relative position adjusting disk of the present invention, a magnetic signal for adjusting the position of the magnetic head can be recorded at an accurate position. By using the relative position adjusting disk of the present invention, The relative position between the magnetic head and the optical head on the magnetic head carriage can be adjusted with high accuracy.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the operation of a floppy disk device that performs servo control of a magnetic head using an optical head.

2A is a plan view of a disk for adjusting a relative position between a magnetic head and an optical head according to an embodiment of the present invention; FIG.

3A is a plan view of a conventional magnetic head and optical head relative position adjustment disk, and FIG. 3B is an enlarged view of a portion L in FIG. 3A.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Disk 2, 9, 15, 21, 22 Magnetic signal 3, 11 Stitch 4 Disk rotation center 5 Magnetic head carriage 6 Optical head 7 Magnetic head 8, 12, Relative position adjustment disk 10, 16, 17, 18, 19 Scratch 13, 14 Concentric circle 20 Key-shaped scratch 23, 24 Magnetic signal for direction discrimination

Claims (4)

[Claims] 1. A disk device which performs servo control so that a magnetic signal can be read and written by a magnetic head on a magnetic track paired with the optical track by following the optical track with an optical head. During its assembly,
A relative position adjustment disk used for adjusting a relative position between a magnetic head and a light spot emitted from an optical head, wherein the magnetic head has a magnetic track on which a magnetic signal is recorded in advance and a local signal on a reproduction signal of the optical head. Information that gives a change
The magnetic head to be adjusted and the light spot irradiated by the optical head are formed to have the same relative position, and along the circle constituting the magnetic track on the relative position adjustment disk, a constant angle of the circle A relative position adjustment disk in which two magnetic signals are recorded point-symmetrically over a range and shifted in the circumferential direction with respect to a fixed point on the circle. 2. Two points formed on both sides of a circle constituting a magnetic track on a relative position adjustment disk over a certain angular range of the circle and displaced in the circumferential direction with respect to a fixed point on the circle in a point-symmetric manner. 2. The method for manufacturing a relative position adjustment disk according to claim 1, wherein a magnetic track is formed by recording a magnetic signal on the scratch with a magnetic head having a wider recording width than the magnetic head to be adjusted. 3. Two magnetic signals recorded along a circle constituting a magnetic track over a certain angular range of the circle and point-symmetrically displaced in a circumferential direction with respect to a fixed point on the circle. 2. The relative position adjusting disk according to claim 1, wherein the relative position adjusting disk is recorded over both sides of the circle. 4. A magnetic signal for discriminating the direction of a magnetic head is recorded on both sides of a circle constituting a magnetic track.
The relative position adjustment disk according to 1.