JPH06302135A - Method and device for positioning head of information storage disk device, method and device for writing servo information, slider, slider supporting member and magnetic disk device - Google Patents

Abstract

PURPOSE:To precisely position a slider on a disk even if vibration is exserted without deteriorating the mechanical resonant characteristic and to write servo information with high quality. CONSTITUTION:An optical pickup 12 is exactly positioned by means of a positioning device 13 for optical pickup, the optical pick up 12 detects a relative position between itself and a slider 2 without being optically in contact with the slider by means of a diffraction groove 18 formed on the rear surface of the slider 2 and outputs a relative position error signal xd from a position error detecting circuit 14. The relative position error signal xd is inputted to a VCM control circuit 6, a VCM 5 is controlled so that the position error xd is held within a prescribed target value, the slider 2 follows up the optical pickup 12 while moving a carriage 4 and the servo information of a disk device 1 rotating a head is exactly positioned on a disk 100 to be recorded without deteriorating the mechanical resonant characteristic of an actuator.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a head positioning method and device for an information storage disk device such as a magnetic disk device or a magneto-optical disk device, and
The present invention relates to a servo information writing method and a writing device for writing servo information on a disk using such a positioning method, a slider, a slider support member, and a magnetic disk device.

[0002]

2. Description of the Related Art In an information storage disk device using a so-called recording disk such as a magnetic disk device or a magneto-optical disk device, servo information is used to position a magnetic head on a target track on the disk. ing. In general, this servo information is externally written using a separate head called a servo writer, or is written using the write head of the magnetic disk device itself. In recent years, with the increase in recording density of information storage devices, data surface servos that write servo information on a part of the data surface are more mainstream than servo surface servos that have a disk surface dedicated to servo information, even in information storage disk devices. As a result, servo information is also written on a part of the data surface by the latter method.

Further, in the case of a small magnetic disk, a rotary type actuator for rotating the carriage about a rotation axis is often used for driving the head and the carriage because of the internal space. Conventionally, positioning of the head is performed by detecting the position of one point of the carriage by a high-resolution laser length meter and driving an actuator so as to match the position with the target position.

By the way, in order to measure the position of the carriage with the laser length meter, it is necessary to install a mirror for reflecting the laser beam at the measuring point. However, since this mirror lowers the mechanical resonance frequency of the actuator and further adds the mechanical resonance generated at the mirror mounting portion, it is necessary to lower the zero-cross frequency of the positioning servo loop, which lowers the positioning accuracy of the head. It was Further, another actuator and a laser length meter are provided outside, the external actuator is connected to the internal actuator, and the head is moved to a predetermined position by positioning the external actuator with the laser length meter. In the positioning method, the significant deterioration of the mechanical resonance characteristics due to the external actuator and its connection has become a more serious problem.

For such deterioration of the mechanical resonance characteristic of the actuator, an auxiliary actuator having a needle-shaped electrode mounted thereon is positioned as described in, for example, Japanese Patent Application Laid-Open No. 2-134778, and the needle-shaped electrode and the head are connected to each other. By detecting the tunnel current or field emission current flowing between the main actuators to be positioned and keeping the value constant,
A method of controlling the main actuator so as to keep the relative position of the main actuator and the auxiliary actuator constant has been proposed. However, it is practically difficult to accurately position the main actuator by detecting the tunnel current or the field emission current flowing between the main actuator and the needle-shaped electrode, and therefore the mechanical resonance characteristic of the actuator is deteriorated. Was still insufficient to prevent.

[0006]

By the way, the vibration caused by the spindle motor or the like for rotating the magnetic disk is transmitted to the rotary shaft of the carriage to vibrate the carriage and the head. In the above-described conventional head positioning method, the position measurement point of the carriage is controlled to stand still at the target position even with such vibration. Therefore, the vibration transmitted from the rotary shaft of the carriage is transmitted with the position measurement point of the carriage that is stationary as a fulcrum, and the head vibrates without stopping. The vibration transmitted to this head is
Depending on the position of the carriage position measurement point, the phase may be reversed or amplified. When the head vibrates, the position of servo information to be written shifts. If the tracks are positioned by such servo information, the interval between the adjacent tracks is not constant, and there is a possibility that a data reproduction error occurs due to the interference of the data on the adjacent tracks. Furthermore, in the future, it is expected that the track spacing will become narrower as the recording density of the magnetic disk device becomes higher.
It becomes a more important issue.

The object of the present invention is to solve the above-mentioned problems in the prior art, namely, without reducing the mechanical resonance characteristics of the actuator, despite the vibration caused by the spindle motor or the like that rotationally drives the magnetic disk. (EN) An information storage disk device capable of accurately positioning the above magnetic head on a disk, a slider head positioning method and its device, and a servo information writing method and device using the same.

Further, it is an object of the present invention to provide a servo information writing method and a writing device which can always write high quality servo information by positioning the head at a fixed position even if vibration is applied to the carriage from the outside. There is.

[0009]

In order to achieve the above object, according to the present invention, in an information storage disk device,
A head positioning method of an information storage disk device for positioning a slider having a head mounted on a rotating disk-shaped recording medium, the method comprising: a carriage for supporting the slider movably on the disk-shaped recording medium; Further, the slider displacement detecting means is accurately positioned by the positioning means capable of more accurate and accurate positioning than the carriage, and the slider displacement detecting means which is accurately positioned relative to the slider in an optically non-contact manner. There has been proposed a head positioning method for an information storage disk device which detects a position and positions the slider based on the detected relative position information.

Further, according to the present invention, the carriage driving means positions a slider carrying a head movably supported on the disk-shaped recording medium by the carriage, and the head drives the servo information on the disk-shaped recording medium. In the servo information writing method, the slider displacement detecting means for detecting the displacement of the slider in a non-contact manner is accurately positioned at a position distant from the disk-shaped recording medium, and the slider displacement detecting means detects the displacement based on an output from the slider displacement detecting means. There has been proposed a servo information writing method for positioning the head by moving the carriage by driving a carriage driving means and maintaining a relative position error between the slider displacement detecting means and the slider at a predetermined target value. .

Further, as a device for achieving the above object of the present invention, there is provided a head positioning device for an information storage disk device, wherein a slider having a head mounted thereon is positioned by a carriage on a rotating disk-shaped recording medium. The carriage driving means for driving the carriage and the carriage are separately arranged, can be moved in the same movement mode as the carriage, and can be positioned with higher precision and accuracy than the carriage. Positioning means, slider displacement detection means attached to the positioning means for accurate positioning, and detecting relative position error with the slider in a non-contact manner, and relative position error information from the slider displacement detection means Drive the carriage drive means based on Head positioning device of the information storage disk device to accurately position on the recording medium is proposed.

Further, similar to the above, as an apparatus for achieving the object of the present invention, a recording medium on which servo information is written, a head for writing servo information on the recording medium,
A slider on which the head is mounted, a carriage that movably supports the slider on the recording medium, a first carriage driving unit that drives the carriage, and a slider displacement that detects the relative position of the slider in a non-contact manner. A detecting means; a means for accurately positioning the slider displacement detecting means for positioning the slider displacement sensor; and a control circuit for controlling the carriage driving means so as to maintain an output from the slider displacement detecting means at a predetermined target value. A servo information writing device has been proposed.

Further, according to the present invention, the carriage position detecting means is provided, and when the slider is out of the detection range of the slider displacement detecting means, the absolute position information of the carriage detected by the carriage position detecting means is used. By driving the carriage driving means based on the above, the head of the slider attached to the carriage is positioned.

In addition, according to the present invention, means for detecting the displacement of the disk-shaped recording medium is further provided,
The output from the recording medium displacement detecting means enables more accurate slider head positioning in consideration of the displacement of the disk-shaped recording medium itself.

Further, according to the present invention, the slider displacement detecting means for detecting the relative position with respect to the slider detects the relative position error with the slider in a non-contact manner by the optical means.

[0016]

According to the head positioning method and apparatus for the information storage disk apparatus proposed by the present invention and the servo information writing method and writing apparatus using the same, the displacement of the slider on which the head is mounted is first corrected. Accurately positioning the slider displacement detection means for non-contact detection, and then maintaining the output from the slider displacement detection means at a predetermined target value, that is, driving the carriage based on their relative positions. While,
By making the slider follow the slider displacement detecting means accurately positioned, the mechanism resonance characteristics as an actuator are not deteriorated, and the position detection error due to the disturbance displacement transmitted to the carriage is eliminated, and the head is accurately It becomes possible to position.

Further, when the slider moves out of the slider displacement sensor detection range due to an impact from the outside or the like, by switching the positioning to the carriage position,
The runaway of the actuator can be prevented.

Further, by positioning the slider so as to follow the displacement of the recording medium, the servo information can be recorded at an accurate position regardless of the displacement of the recording medium.

The optical pattern or the light emitting element or the light receiving element is used to optically detect the relative position in a non-contact manner to accurately adjust the slider on which the head is mounted without deteriorating the mechanical resonance characteristics of the actuator. Can be positioned.

[0020]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 is a diagram showing the configuration of a magnetic disk device that employs the servo information writing method and the writing device of the present invention, and in particular, a servo track writer portion that writes servo information on a disk of the magnetic disk device.

In the figure, a servo track writer is provided with a disk device 1 in which a plurality of disks in which data and servo information are written on a recording surface are stacked, and a head for writing servo information together with data in the disk device 1. Slider 2, a load arm 3 for pressing the slider 2 onto the disk device 1, and a carriage for positioning the slider 2 at an arbitrary position on the disk device 1 while supporting the slider 2 via the load arm 3. 4 and a VCM for driving this carriage 4
(Voice coil motor) 5, VCM control circuit 6 for controlling drive current i of VCM 6 according to the value of position error xd, and head on slider 2 are used to write servo information on disk device 1. The servo information writing circuit 7 (here, the data writing circuit for writing data on the disk device 1 using the head of the slider 2 is not shown).

The spindle 8 of the disk device 1 for stacking and holding a plurality of disks is connected to a spindle motor 9 for rotating the spindle.
It is connected to a spindle motor drive circuit 10 which drives the spindle motor 9 at a constant rotation. Here, reference numeral 11 is an MPU (microprocessor) for controlling the entire operation, reference numeral 12 is an optical pickup attached to the back surface of the slider 2 for detecting a diffraction groove, which will be described in detail later, and reference numeral 13 is. Is an optical pickup positioning device (comprising a rotating portion 13A and an arm 13B) capable of moving and accurately positioning the optical pickup 12, and reference numeral 14 in the drawing denotes an output of the optical pickup 12. A position error detection circuit that detects the position error xd, and a reference numeral 19 is a clock head that generates a clock that serves as a reference when writing servo information. The centers of rotation of the rotary unit 13A and the carriage 4 are positioned on the same axis, and they are separated by different drive systems (6 and 1).
1) and operates in a similar manner.

That is, in the disc device 1, the spindle 8 in which a plurality of discs are stacked is rotationally driven by the spindle motor 9. The spindle motor 9 is driven by a spindle motor drive circuit 10 and is thus kept at a constant rotation speed. On the other hand, the slider 2 is supported by a carriage 4 via a load arm 3, and the carriage 4 is driven by the VCM 5 to move on the disk surface of the disk device 1.

Here, according to the servo information writing method of the present invention, first, the optical pickup positioning device 13 is provided.
Moves the optical pickup 12 on the same rotation axis and on the same radius as the slider 2 so that the optical pickup 12 causes the optical pickup 12 to write servo information in a plurality of disks of the disk device 1. 100 (according to the present embodiment, this servo information writing disk is the uppermost disk of the plurality of disks of the disk device 1) and is accurately positioned at a predetermined position.

On the other hand, on the back surface of the slider 2 shown in FIG.
As shown in FIG. 5, the diffraction groove 18 is formed, and thus the position of the slider 2 is accurately positioned by detecting the position of the diffraction groove 18 by the optical pickup 12. That is, the position error detection circuit 14 detects the relative position error xd between the optical pickup 12 and the slider 2 from the output of the optical pickup 12. The VCM control circuit 6 drives the carriage 4 according to the value of the detected position error xd.
The carriage 4 is driven so that the position error xd is zero, that is, the slider 2 is directly below the optical pickup 12, and the head on the slider 2 is positioned.

The clock head 19 first writes a clock signal of a constant frequency for one rotation outside the recording area of the disk 100, and reproduces the clock signal when writing servo information. The servo information writing circuit 7 operates when the slider 2 is positioned at the target position.
The upper head is used to write servo information on the disk 100 in synchronization with the clock signal reproduced by the clock head 19.

The MPU 11 controls the entire servo track writer. That is, to explain the servo information writing operation, the MPU 11 first sends a command to the spindle motor drive circuit 10 to send the spindle motor 9
Is started, and until the rotation speed stabilizes, the clock signal is written by the clock head 19 for one rotation. Next, move the slider 2 to the innermost or outermost initial position,
After that, the optical pickup 12 is moved onto the slider 2 so that the slider 2 follows the optical pickup 12. When the slider 2 is in the follow-up state,
The slider 2 is positioned by moving the optical pickup 12 to a predetermined position at a speed and an acceleration so that the tracking is not lost.
A command is sent to the servo information writing circuit 7 to write the servo information on the disk 100 in synchronization with the clock signal reproduced by the clock head 19. After writing the servo information for one track, the optical pickup is moved to the next position. In this way, the positioning of the slider 2 and the writing of the servo information are repeated, and when the servo information is written in all the tracks, the spindle motor 9
To stop writing servo information to the disk device 1.

That is, according to the present invention, in the configuration as shown in FIG. 1, the optical pickup 12 is accurately positioned, and the carriage 4 is driven so that the slider 2 follows the optical pickup 12. As a result, the mechanical resonance characteristics of the actuator are not deteriorated, and the head on the slider 2 can be accurately positioned at a fixed position on the disk 100 even if the carriage 4 is vibrated, whereby high-quality servo information can be obtained. Can be written. Hereinafter, a more specific description will be added.

FIG. 2 shows the relationship between the diffraction groove 18 formed on the slider 2 and the optical pickup 12. The optical pickup 12 emits a laser beam toward the diffraction groove 18, detects the reflected light from the diffraction groove 18, and thus detects the relative displacement between the diffraction groove 18 and the optical pickup 12. Such a positioning method using the optical pickup 12 and the diffractive groove 18 is known, for example, as an optical disk tracking method, and as an optical disk tracking method, there is, for example, a push-pull method. In the push-pull method, the first-order diffracted light from the diffraction groove 18 is received by a two-divided photodetector (PD), which will be described in detail later, and the position error is detected from the output difference of the PD. In this case, the depth of the diffraction groove 18 is λ with respect to the wavelength λ of the laser.
/ 8. As a result, the tracking accuracy of the optical disc is ± 0.1 μm or less. The optical pickup 12 also has a focusing function,
As a result, the laser beam applied to the diffraction groove 18 can always be focused by following the vertical movement of the slider 2.

Further, in FIG. 2, a plurality of diffraction grooves 18 are formed on the back surface of the slider 2, but this is because the slider 2 has an optical pickup 12 due to an impact from the outside.
This is to prevent the carriage 4 from running out of control because the carriage 4 moves out of the detection range. That is, since the detection range of the optical pickup 12 is widened by providing the plurality of diffraction grooves 18, the possibility that the carriage 4 may run away is reduced.

FIG. 3 shows the sectional shape of the diffraction groove 18 on the back surface of the slider 2 (FIG. 3A) and the optical pickup 12.
An example of the relationship with the position error signal xd (FIG. 3 (B)) detected by the position error detection circuit 14 is shown. As is clear from this figure, even if the slider 2 moves due to an impact, if it is within the detection range of the optical pickup 12, the number of peaks of the position error signal xd crossed when the slider 2 moves is counted, and the peaks thereof are counted. It is possible to return to the original position by moving in the opposite direction by the number of p. The diffractive groove 18 is also formed long enough in the longitudinal direction of the carriage 4, so that the optical pickup 12 and the slider 2 may be different from each other due to a dimensional error of each component of the magnetic disk device, an error in a mounting position on the servo track writer, and the like. Even if the relative position in the carriage rotation radius direction is displaced, the beam of the optical pickup 12 is prevented from coming off the diffraction groove 18.

Since the slider 2 described above is manufactured by a method similar to that for manufacturing a semiconductor, the diffraction groove 18 is also processed during the manufacturing process by using a method such as etching. By doing so, it can be formed on the back surface of the slider 2 with high precision.

In FIG. 4, unlike the embodiment shown in FIG. 2, the diffraction groove 18 is formed not on the back surface of the slider 2 but on a part of the surface of the load arm 3 to which the slider 2 is fixed. It is a figure which shows an example. In recent years, the shape of the slider 2 has tended to become smaller in response to lower flying height of the slider 2 and the like, so that it may be impossible to secure a space for installing the diffraction groove 18 on the surface of the slider. In such a case, as shown in FIG. 4, the diffraction groove 18 may be formed at a position close to the head on the surface of a part of the member supporting the slider 2 such as the load arm 3.

According to the two modified examples described above, the diffraction groove 1 is formed on the back surface of the slider 2 or a part of the load arm 3.
By forming 8, the head on the slider 2 can be stably positioned because the detection range of the optical pickup 12 has a width even if the slider 2 is slightly displaced by an external impact.

By the way, in the present invention, it is not always necessary to form a special optical pattern on the slider 2 like the above-mentioned diffraction groove, and for example, the characteristic of the shape of the slider 2 may be used. For example, FIG. 5 shows an embodiment in which the edge of the slider is used as an optical pattern. In this embodiment, as shown in the drawing, light from a light emitting element 20 such as an LED (laser diode) arranged on the back side of the slider 2 is reflected and the reflected light is received by a light receiving element 21. When the light from the light emitting element 20 impinges on the edge portion of the slider 2, the light deviating from the edge is not input to the light receiving element 21, and therefore the displacement of the slider 2 can be detected from the output of the light receiving element 21. . However, the edge of the slider 2 needs to be processed with sufficient accuracy, and if the back surface of the slider 2 does not reflect light, it needs to be mirror-finished in advance. Further, this edge is not limited to the edge of the slider 2,
For example, it may be the edge of another part such as the load arm 3,
Further, instead of the edge, it is also possible to use a portion having different light reflectance. Further, the light receiving element 21 has a sufficient size so as not to be affected by a slight displacement of the slider 2. Further, as the light receiving element 21, a line sensor or an area sensor may be used instead of the above-described photo detector (PD) to detect the edge position.

Contrary to the above embodiment, FIG. 6 shows another modification in which the light emitting element 20 is provided on the slider 2 side to detect the positional relationship between the slider 2 and the optical pickup 12. An example is shown. That is, according to this modification, the light emitted from the light emitting element 20 provided on one side of the slider 2 so as to project therefrom emits light emitted by the optical pickup 1.
It is received by the second light receiving element 21. The light receiving element 21 is divided into two, and the difference between the outputs from the two light receiving portions causes
The relative displacement between the light emitting element 20, that is, the slider 2 and the optical pickup 12 can be detected. The light emitting element 21 is provided on the uppermost part or the lowermost part of the slider 2, and the emitted light is directed from the surface opposite to the surface on which the head is mounted toward the outside of the magnetic disk device. Is being emitted.

However, the direction in which the light emitting element 20 emits light is not necessarily limited to the back direction as described in the above embodiment, and the light receiving element 21 emits the light emitted from the light emitting element 20. Any direction may be used as long as it receives light. For example, as shown in FIG. 7, light may be emitted in the side direction of the slider 2. In that case, the light emitting element 20 is also arranged on the side of the slider 2. . in this way,
Similarly to the slider 2, the light emitting element 20 can be provided at any position corresponding to the position. Also, FIG.
As shown in, the light receiving element 21 may be mounted on the back surface of the slider 2 and arranged outside so that the light emitting element 20 is located above it.

Next, FIG. 9 is a diagram showing the structure of a servo track writer according to the second embodiment of the present invention. In FIG. 9 as well, the same components as those shown in FIG. 1 are designated by the same reference numerals, and the reference numeral 15 in the drawing indicates a scale for detecting the position of the carriage 4, the reference numeral 1
Reference numeral 6 denotes a fixed position sensor for reading the scale 15 described above, and reference numeral 17 denotes a carriage position detection circuit for detecting the position of the carriage 4 from the output of the position sensor 16.

In the above-mentioned structure, the position sensor 16 fixed in the magnetic disk device is moved by the movement of the scale 15 arranged on the carriage 4 to cause the carriage 4 to move.
The displacement of is output. After that, the displacement of the carriage 4 is converted into an electric signal by the carriage position detection circuit 17 and output. For example, when the slider 2 is out of the detection range of the optical pickup 12 due to an impact from the outside,
The VCM control circuit 6 switches the internal control circuit to detect the position of the carriage 4 (carriage position signal).
The drive of the VCM 5 is controlled by the
Position the upper head.

According to the present embodiment, even if the slider 2 is out of the detection range of the optical pickup 12, stable positioning is possible without runaway. Therefore, the number of diffraction grooves 18 can be reduced. Furthermore, when moving the slider 2, V
Driving the CM 5 is more stable than moving the optical pickup 12 while following it, and at the same time, the moving time can be shortened. However, slider 2
The final positioning of the optical pickup 12 and the diffraction groove 18
Therefore, the detection accuracy of the position of the carriage 4 may be rough, for example, about 1/2 of the track pitch.

Further, FIG. 10 shows the structure of a servo track writer according to a third embodiment of the present invention.
In FIG. 10 as well, the same components as those shown in FIG. 1 are designated by the same reference numerals, and the reference numeral 22 in the figure is used.
Is a laser length measuring device for detecting the displacement xm of the disk 100. The disc displacement xm detected by the laser length measuring device 22 is input to the VCM control circuit 6, and the VCM 5 is driven by the difference from the position error xd detected by the optical pickup 12 and output from the position error detection circuit 14. To do. That is, the target value of the position error xd is changed from the optical pickup 12 based on the disc displacement xm detected by the laser length measuring device 22.

Therefore, since the slider 2 moves so as to follow the disc 100, the servo information can be written at an accurate position regardless of the displacement of the disc 100. However, since the output xm from the laser length-measuring device 22 also includes a component depending on the shape of the disc 100, the disc 1 is first recorded.
It is necessary to measure the shape of 00 and remove it from the output xm. In addition, even if the servo information actually vibrates to some extent, the vibration may be acceptable as long as the vibration is synchronized with the rotation because the track pitch is kept constant. In that case, the output xm of the laser length measuring device is measured for a plurality of rotations and averaged, and the value is removed from the output xm so that the slider 2 can follow only the component that is not synchronized with the rotation. Good.

In the various embodiments described above, the diffraction groove 18 is formed by, for example, a method such as etching, but instead of this, for example, the slider 2 or the load arm 3 is coated with a resin or the like, Then, it can be formed by stamping so as to manufacture an optical disk, or a separately manufactured diffraction groove may be attached later.

Further, the above-mentioned optical pattern and optical sensor are not limited to the diffraction groove 18 and the optical pickup 12, and other optical type position detecting system may be adopted. Further, the light emitted from the light emitting element of the optical pickup 12 or the position sensor 16 is not limited to visible light, but may be infrared light or ultraviolet light, and need not be coherent light such as a laser beam.

By the way, the head according to the above embodiment is positioned, and the fixed head is installed inside the magnetic disk drive.
By using the fixed head as a clock head for writing servo information, the servo information can be written outside the clean room. In that case, a transparent window is provided in the detection range of the slider 2 of the case.

In each of the above embodiments, the data surface servo is used as an example, but the invention can be applied to the servo surface servo.

[0047]

According to the present invention, an optical pickup as a slider displacement detecting means for detecting the displacement of a slider carrying a head in a non-contact manner is accurately positioned by a positioning device, and the output from this optical pickup is obtained. Since the carriage is driven to cause the slider to follow the optical pickup so that the relative position error is maintained at a predetermined target value, the mechanical resonance characteristic of the actuator does not deteriorate, and the position due to the disturbance variation transmitted to the carriage. It has a technically excellent effect that the head can be accurately positioned without any detection error.

Further, according to the present invention described above, even if the slider moves out of the detection range of the optical pickup due to an impact from the outside or the like, the positioning is performed by the absolute position of the carriage to prevent the runaway of the actuator. be able to.

Further, according to the present invention described above, by positioning the slider so as to follow the displacement of the rotating disk-shaped recording medium itself, it is possible to always record servo information at an accurate position regardless of the displacement of the recording medium. Therefore, it becomes possible to obtain high-quality servo information.

Further, since the optical displacement or the light emitting element or the light receiving element is used as the slider displacement detecting means for detecting the displacement of the slider carrying the head in a non-contact manner, the mechanical resonance characteristic of the actuator is not deteriorated. In addition, the displacement of the slider on which the head is mounted can be accurately detected without contact, and high-quality servo information can be recorded on a disk.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a servo track writer that positions a slider by using the present invention in order to write servo information on a disk in a magnetic disk device.

FIG. 2 is a partially enlarged perspective view of the servo track writer showing a diffraction groove and an optical pickup formed on a slider.

FIG. 3 is a diagram showing an example of a relationship between the diffraction groove and a position error signal.

FIG. 4 is a partially enlarged perspective view showing a modification in which the diffraction groove is formed on a load arm.

FIG. 5 is a partially enlarged perspective view showing a modified example in which the edge of the slider is used as an optical pattern.

FIG. 6 is a partially enlarged view showing a modification example in which a light emitting element is provided on the slider to detect a position.

FIG. 7 is a partially enlarged perspective view showing another modified example in which a light emitting element is provided on the slider to detect the position.

FIG. 8 is a partially enlarged perspective view showing still another modification in which a light receiving element is provided on the slider to detect the position.

FIG. 9 is a block diagram showing a configuration of a servo track writer according to a second embodiment of the present invention.

FIG. 10 is a block diagram showing a configuration of a servo track writer according to a third embodiment of the present invention.

[Explanation of symbols]

 1 disk device 100 disk 2 slider 4 carriage 5 VCM (voice coil motor) 12 optical pickup 13 optical pickup positioning device 14 position error detection circuit 15 scale 16 position sensor 17 carriage position detection circuit 18 diffraction groove 20 light emitting element 21 light receiving element

Claims (26)

[Claims] 1. A head positioning method for an information storage disk device for positioning a slider having a head mounted on a rotating disk-shaped recording medium, the slider being movably supported on the disk-shaped recording medium. Separately from the carriage to be used, the slider displacement detecting means is accurately positioned by the positioning means capable of higher precision and more accurate positioning than the carriage, and the slider displacement detecting means which is accurately positioned is optically non-contact. A head positioning method for an information storage disk device, comprising: detecting a relative position with respect to the slider, and positioning the slider based on the detected relative position information. 2. A head positioning method for an information storage disk device according to claim 1, wherein said positioning means capable of accurately positioning said slider displacement detecting means is a position remote from said carriage, said disk-shaped recording medium. The carriage is movable in the same manner as the carriage is moved with respect to the surface, and the slider is made to follow the slider displacement detecting means by the relative position error information from the slider displacement detecting means. A head positioning method for an information storage disk device, characterized in that the head is moved to the position. 3. A head positioning method for an information storage disk device according to claim 1, wherein the relative displacement between the slider and the slider displacement detecting means is detected by using an optical pattern. Head positioning method for storage disk device. 4. A servo information writing method for positioning a slider having a head movably supported on a disk-shaped recording medium by a carriage by means of a carriage driving means and writing servo information on the disk-shaped recording medium by the head. In which the slider displacement detecting means for detecting the displacement of the slider in a non-contact manner is accurately positioned at a position distant from the disk-shaped recording medium, and the carriage driving means is driven based on the output from the slider displacement detecting means. The servo information writing method is characterized in that the head is positioned by moving the carriage to maintain a relative position error between the slider displacement detection means and the slider at a predetermined target value. 5. The servo information writing method according to claim 4, further comprising a carriage position detecting means for detecting a position of the carriage, wherein the slider is outside a detection range of the slider displacement detecting means,
A servo information writing method characterized in that the carriage is moved and the head is positioned by driving the carriage driving means based on the carriage position detected by the carriage position detecting means. 6. The servo information writing method according to claim 4, further comprising a disc displacement detection means for detecting displacement of the disc of the disc-shaped recording medium,
A servo information writing method, wherein a target value of the relative position error between the slider displacement detection means and the slider is changed according to the disk displacement detected by the disk displacement detection means. 7. The servo information writing method according to claim 4, wherein the slider displacement detecting means optically detects the displacement of the slider in a non-contact manner. 8. The servo information writing method according to claim 5, wherein the carriage position detecting means optically detects the position of the carriage in a non-contact manner. 9. The servo information writing method according to claim 6, wherein the disc displacement detecting means optically detects a disc displacement of the disc-shaped recording medium in a non-contact manner. Writing method. 10. A magnetic disk drive in which servo information is written by the method for writing servo information according to claim 4. 11. A head positioning device of an information storage disk device for positioning a slider having a head mounted on a rotating disk-shaped recording medium by means of a carriage, the carriage driving means for driving the carriage, and the carriage. And the positioning means, which are separately arranged, are movable in the same movement mode as the carriage, and can perform accurate positioning with higher accuracy than the carriage, and an accurate positioning means attached to the positioning means. Positioning is performed, and slider displacement detection means for detecting relative position error with the slider in a non-contact manner, and the slider while driving the carriage drive means based on relative position error information from the slider displacement detection means Is characterized in that it is accurately positioned on the disk-shaped recording medium. Head positioning device for storage disk device. 12. The head positioning device for an information storage disk device according to claim 11, wherein the carriage is a rotary type carriage that rotates about a predetermined rotation axis, and the positioning means is a carriage. A head of an information storage disk device, comprising: a rotating portion that independently rotates on the same axis as the rotation center position; and an arm portion provided on the rotating portion and having the slider displacement detecting means attached to the tip thereof. Positioning device. 13. The head positioning device for an information storage disk device according to claim 11, wherein the slider displacement detection means optically detects a relative position error with the slider in a non-contact manner. Head storage device for information storage disk device. 14. A head positioning device for an information storage disk device according to claim 13, wherein said slider displacement detecting means emits light toward said slider or its vicinity, and said slider or its vicinity. A head positioning device for an information storage disk device, comprising: a light receiving element that receives the reflected light reflected by. 15. The head positioning device for an information storage disk device according to claim 14, wherein a diffraction groove is formed in or near the slider. 16. The head positioning device for an information storage disk device according to claim 13, wherein a light emitting element is provided on the slider or a portion in the vicinity thereof, while a light receiving element is provided on the slider displacement detection means. Accordingly, the head positioning device of the information storage disk device is characterized in that the relative position error between the slider and the slider displacement detecting means is detected from the light receiving element. 17. The head positioning device for an information storage disk device according to claim 13, wherein a light receiving element is provided on the slider or a portion in the vicinity thereof, while a light emitting element is provided on the slider displacement detecting means. Accordingly, the head positioning device of the information storage disk device is characterized in that the relative position error between the slider and the slider displacement detecting means is detected from the light receiving element. 18. A head positioning device for an information storage disk device according to claim 11, further comprising a carriage position detecting means for detecting an absolute position of said carriage, and relative position error information from said slider displacement detecting means. And an information storage disk device characterized in that the slider is accurately positioned on the disk-shaped recording medium while driving the carriage driving means based on the absolute position information of the carriage detected by the carriage position detecting means. Head positioning device. 19. The head positioning device for an information storage disk device according to claim 18, wherein the carriage position detecting means has an optical pattern attached to a partial surface of the carriage, the optical pattern being opposed to the optical pattern. A head positioning device for an information storage disk device, wherein the absolute position of the carriage is detected by recognizing it by an optical element. 20. The head positioning device for an information storage disk device according to claim 11, further comprising means for detecting a displacement of the rotating disk-shaped recording medium. Head positioning device. 21. A recording medium on which servo information is written, a head for writing servo information on the recording medium, a slider on which the head is mounted, a carriage for movably supporting the slider on the recording medium, and First carriage driving means for driving a carriage, slider displacement detecting means for detecting the relative position of the slider in a non-contact manner, means for accurately positioning slider displacement detecting means for positioning the slider displacement sensor, and the slider A servo information writing device comprising: a control circuit for controlling the carriage driving means so that the output from the displacement detecting means is maintained at a predetermined target value. 22. The servo information writing device according to claim 21, further comprising: a carriage position detecting means for detecting a position of the carriage, and a carriage driving means by a carriage position output from the carriage position detecting means. A second control circuit for controlling and a control circuit for controlling the carriage driving means is switched from the first control circuit to the second control circuit when the slider is out of the detection range of the slider displacement detection means. A servo information writing device comprising: a control switching unit. 23. The servo information writing device according to claim 21, further comprising: a recording medium displacement detecting means for detecting displacement of the recording medium; and a recording medium displacement detected by the recording medium detecting means. A servo information writing device, comprising: a target value changing means for changing a target value for holding an output from the slider displacement detecting means. 24. A head mounted slider having an optical pattern or an emitting element or a light receiving element. 25. A slider support member for supporting a slider on which the head is mounted, the slider support member having an optical pattern or an emitting element or a light receiving element so as to be located near the head. 26. A magnetic disk drive incorporating the slider according to claim 24 or the slider support member according to claim 25.