JPS62154388A - Head position adjusting method for standard disk forming device - Google Patents

Abstract

PURPOSE:To adjust the position of a head accurately by providing a detection body where a detection pattern is displayed to the peak part of the rotating shaft of a rotary driving part where a disk is set, moving an enlargement optical system in a radial direction of the disk and detecting the detection pattern and the gap of a recording head, and detecting the current movement distance of the enlargement optical system by a length measuring instrument. CONSTITUTION:A slit plate 90 is fitted to the main shaft peak part of a disk rotary driving mechanism 10 and the head gap 41 between the slit 91 of the slit plate 90 and the recording head 40 is detected through a microscope 53 by moving a moving table 50. Then, the movement distance of the moving table 50 at this time is measured by a laser interference length measuring instrument 60 to obtain a reference value. Consequently, the main shaft center position O of the rotary driving mechanism 10 is detected accurately, and consequently the distance from the center O of the main shaft to the center P of the head gap is found with high accuracy. Consequently, the position of the head gap 41 of the recording head 40 is set extremely accurately for the center 0 of the main shaft, and consequently a high-accuracy standard disk is formed.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an apparatus for creating a standard disk used for head alignment of a disk drive device that uses a flexible type disk such as a 70-tube disk as a recording medium. In particular, the present invention relates to an improvement in a head position adjustment method for accurately positioning the recording head of this standard disk production apparatus.

[Technical background of the invention and its problems]

Adjusting the head position is one of the important adjustment items in disk drives such as disc drives.
In recent years, one of the adjustment methods has been to use a standard disk. The first method is to prepare a standard disk on which adjustment signals are recorded in advance on predetermined tracks, and to adjust the head position by inserting this standard disk into a drive unit and reproducing the signals. , efficient adjustment can be made.

By the way, how to perform accurate i4 adjustment with this kind of adjustment method? It is necessary to create a quasi-disc with high precision, but to do so, it is necessary to create this standard disc and set the position of the recording head in the neck with high precision. Therefore, in the past, for example, the side surface of the main shaft of a disk rotation mechanism could be visually inspected using a microscope or the like. J! By doing this, the center of the axis is detected, and the origin of the linear length measurement is set at this detected position. From then on, by moving the recording head according to the scale of this linear length measuring device, the recording head can be adjusted. The head gap position of the disc is adjusted to a predetermined track position of the disk.

However, in this conventional adjustment method, it is difficult to accurately detect the center position of the rotating shaft because the side surface of the rotating shaft of the disk rotating mechanism is round, and therefore, it is difficult to accurately detect the center position of the rotating shaft. There was a drawback that the distance between the recording heads could not be set to a high viscosity, and the nine positions of this bundled recording head could not be set with high precision.

(Sl Ming's purpose) Water j? An object of the present invention is to provide a method for adjusting the head position of a standard disk production device, which allows the distance violet between the rotation axis center and the head gap to be measured with high precision, and the head position can be adjusted accurately. .

(Model of the Invention) In order to achieve the above object, the present invention provides a detection body displaying a detection pattern on the top of the rotating shaft of a rotary drive unit in which a disk is set, and a magnifying optical system is installed in the radial direction of the disk. By moving the above-mentioned detection pattern and the gear knob of the recording head, and detecting the moving distance of the magnifying optical system at this time with a length instrument, the gap between the center position of the rotation axis and the recording head is determined. The recording head is positioned at a predetermined track on the disk by determining the distance between the two positions and using this distance as a reference distance to move the recording head in the radial direction of the disk.

[Embodiment of the Invention] FIGS. 1 and 2 show the configuration of a standard disc creation apparatus for carrying out a head position adjustment method according to an embodiment of the present invention. FIG. 1 is a plan view thereof, and FIG. FIG. 2 is a side view showing the circuit portion together.

This apparatus includes a disk rotation mechanism 12 and a recording head moving mechanism 50 as the apparatus main body. The disk rotation mechanism 10 rotates a main shaft 12 by a drive motor 11, thereby rotationally driving the disk 20. The amount of rotation of the main shaft 12 at this time is detected by a rotary encoder 13. On the other hand, the recording head moving mechanism 30 has, for example, a step motor as a driving source, and the recording head movement mechanism 30 has, for example, a step motor as a drive source, and the recording head movement mechanism 30 uses the step motor to move the recording head attached to the tip of the arm 31.
The gutter 40 is slid in the radial direction of the disk 20, and the moving distance f of the recording head 10 at this time is measured by the t-linear IIQ length gauge 33. Here, as the linear I1II i device 33, for example, a slit array is formed on a glass scale and the length is measured by detecting the slits. In addition, 3
2 is a fixed table on which the linear length machine 33 is placed.

Further, in a position adjacent to the main body of the apparatus, there is disposed a moving table 50 which is guided and supported by, for example, a rail and is configured to be manually movable in the same direction as the sliding movement direction of the recording I/rad 0 (in the direction of the arrow). 39, and a microscope 53 is installed on this moving table 50 via a support stand 51 and a support arm 52. The microscope 53 is moved over the disk 20 by the movable table 50, thereby magnifying and detecting the top of the spindle and the head gap of the recording head 40, which will be described later. In addition, 5
5 is a camera for recording an enlarged image. Furthermore, a laser interferometric length measuring device 6 is provided on the moving extension of the moving table 50.
0 is set. This laser interference length measuring device 60 transmits a laser beam emitted from a laser oscillator 61 to the movable table 5.
This laser beam is emitted toward the moving table 5.
0 is received, and the moving distance of the moving table 50 is detected from the interference at that time.

By the way, the main shaft 1 of the disk rotating piece 17In structure 10
A hole is formed at the top of 2, and a 3rd hole is formed in this hole.
As shown in Figures (a) and (b), a Surinoto board 90 is embedded. This slit plate 90 has a slit 91 of, for example, 1-width in the center, and the position of the slit 91 is determined to pass through the axial center of the main shaft 12. Note that 93 in the figure is an adhesive for fixing the slit plate 90 to the hole.

Further, this device is equipped with a control circuit 80 consisting of, for example, a microcomputer. This control circuit 80 controls recording of adjustment signals on the disk 20 according to instructions from an external control device 70 having an arithmetic device 71 and an external storage section 72.

Next, the head position adjustment method of this embodiment will be explained based on the above-described apparatus. Incidentally, FIG. 4 is a schematic diagram for explaining the vJ11 method, and AA' in the figure indicates the slide movement path of the recording head 40. The adjuster first moves the microscope 53 to a position above the main shaft 12 of the rotary drive mechanism 10 using the moving table 50 without setting the disk 20 in the rotary drive mechanism 10, and at this position visually observes the microscope 53 to locate the top of the main shaft. A slit plate 90 provided in
The slit 91 of the microscope $1 is detected.
The position of the moving table 50 is adjusted to match the cursor line 53. That is, the axis center O of the main shaft 12 is detected using the microscope 53. In this state, the laser interferometric length measuring device 6
0 and measure the position of the moving table 5o at this time. Next, move the moving table 50 again and
This time, set l153 to a position above the recording head 40,
At this position, the microscope 53 is visually checked and the microscope 53 is positioned so that the cursor line of the microscope 53 coincides with the end position of the Herad gap (read/write gap) 41 of the recording head 4 degrees. In this state, the laser interferometer 6o
The position of the moving table 50 at this time is measured. After each position measurement value for the spindle 12 and the recording head 40 is determined, the adjuster calculates the difference between these position measurement values, and thereby moves from the spindle center O to the center P of the head gap 41 of the recording l\rad 0. Calculate the distance K to At this time, the laser interferometric length measuring device 60 can only obtain a fixed value from the position of the end of the head gap 41, but by calculating the length 2ΔY of the head gap 41 in advance, it is possible to measure the length of the recording head from the main axis center O. The distance l1IK to the center P of the head gap 41 of 4o can be easily determined.

Next, the distance between the spindle center 0 and the spacing gap center P obtained in this way, that is, the reference distance K, is measured using the linear length measuring device 3.
This linear length measuring device 33 is used to adjust the position of the recording head 40, corresponding to the length from the origin 0' on the scale No. 3.

For example, if the center P of the head gap 41 of the recording head 40 is set at a position Q corresponding to a predetermined track of the disk 20, and if the distance from the spindle center 0 to this position Q is J, then the linear length measuring device 33 The position of the recording head 40 may be moved by driving the recording head moving mechanism 30 so that the measured value H becomes H-J-(K-L). As a result, the recording head 40 is accurately set at a predetermined track position relative to the main shaft center O.

In this embodiment, the disk rotation drive mechanism 1
A slit plate 90 is placed in front of the top of the main shaft of the slit plate 90, and the slit 91 of this slit plate 90 and the head gap 41 of the recording head 40 are respectively detected by the microscope 53 by moving the moving table 50. Since the reference value is obtained by measuring the moving distance of the moving table 50 with the laser interferometer 60, this method is compared to the conventional method in which the center position of the main shaft is detected from the side surface of the main shaft of the rotational drive mechanism. Therefore, the main shaft center position O of the rotational drive mechanism 10 can be detected accurately, and thereby the distance from the main shaft center O to the head gap center P can be determined with high precision.

As a result, the position of the head gap 41 of the recording head 40 can be accurately set with respect to the spindle center O, thereby making it possible to create a high-density disk.

Note that the present invention is not limited to the above embodiments. For example, in the above embodiment, the slit plate 90 is
1 passes through the center of the main axis, but this does not necessarily have to be the case. However, in this case, the fifth
As shown in the figure, first place mr! at the position of slit 91! 1u5
3 and measure the current position with the laser interferometer 60, then rotate the main shaft 12 by 180 degrees while monitoring the detection output of the rotary encoder 13, and measure the position of the slit 91' after this rotation. Position the cursor on the microscope 53 and set the position at this time to the laser drying [
It is necessary to measure with the measuring device 60 and find the spindle center position O from the difference between the measured values at each of these positions. Alternatively, a black and white pattern may be displayed on a detection plate as the detection object, and the center of the main axis may be determined by detecting the border W of this black and white pattern. In addition, the Iq configuration of the detector and detection pattern, the magnifying optical system, the configuration of the reference position length measuring device, the linear length measuring device, etc. can be modified in various ways without departing from the gist of the present invention.

(Effects of the Invention) As detailed above, according to the present invention, the disk is
A detection object displaying a detection pattern is provided at the top of the rotating shaft of the rotation drive unit to be rotated, and the detection pattern and the gear of the recording head are respectively detected by moving a magnifying optical system in the radial direction of the disk, By detecting the moving distance of the enlarging optical system at this time with a length measuring device, the distance between the center position of the rotation axis and the gap position of the recording head is determined, and this distance is used as a reference distance to move the recording head toward the disk. By moving the recording head in the radial direction and aligning the recording head with a predetermined track on the disk, the distance between the rotation axis center and the helad gap can be increased to 4 degrees. Accordingly, it is possible to provide a method for adjusting the head position of a standard disc production apparatus that can accurately adjust the head position.

[Brief explanation of drawings]

1 and 2 show the configuration of a standard disc creation apparatus for implementing the head position adjustment method according to an embodiment of the present invention; FIG. 1 is a plan view thereof, and FIG.
The figure is a side view that also shows the configuration of the circuit part, and Figure 3 (a)
) and (b) are respectively a plan view and a side sectional view showing the configuration of the top of the spindle, FIG. 4 is a schematic diagram for explaining the head position adjustment method, and FIG. 5 is for explaining another embodiment of the present invention. FIG. DESCRIPTION OF SYMBOLS 10... Disk rotation drive mechanism, 11... Drive motor, 12... Main shaft, 13... Rotary encoder,
20... Disc, 30... Recording head moving mechanism,
31... Arm, 32... Fixed table, 33...
- Linear training device, 40... Recording head, 41... Head gap, 5o... Moving table, 51... Support stand, 52... Support arm, 53... Microscope, 54 Reflector plate, 60... Laser interference length measuring device, 61... Laser light camera, 9°... Slit plate, 91... Slit,
0... Spindle center position, P... Head gap center position.

Claims (1)

[Claims] In a method for adjusting the head position of a standard disc creation device in which a standard disc is created by recording a signal for positioning the head of the disc drive device on a predetermined track, a detection pattern is placed on the top of the rotating shaft of the rotary drive unit in which the disc is set. A detection object is provided, and by moving the magnifying optical system in the radial direction of the disk, the detection pattern and the recording head gap are respectively detected, and the moving distance of the magnifying optical system at this time is measured using a length measuring device. The distance between the center position of the rotating shaft and the gap position of the recording head is determined by detecting the distance, and the recording head is moved in the radial direction of the disk using this distance as a reference distance to move the recording head to a predetermined track on the disk. A method for adjusting the head position of a standard disc creation device, which comprises aligning a recording head.