JPS6145409A - Alignment disc for driving both-side head - Google Patents

Abstract

PURPOSE:To shorten an assembling time and to improve assembling accuracy by arranging adjusting signals for the track diameter direction, index timing direction and azimuth direction properly on the same track. CONSTITUTION:An inner periphery signal 11 and an outer periphery signal 12 geometrically and alternately expanded from the center line 2 of an adjusting signal track on an alignment disc 1 for driving the both-side head to the inner periphery and outer periphery sides respectively are formed on the center line 2 as a track diameter adjusting signal 10. A timing signal 21 is arranged on the center line 2 after a prescribed period from an index timing detecting point 22 as an index timing adjusting signal 20. In addition, a CW signal 31 having regulated intersected angles alpha', alpha formed by respective radius lines expanded from the center axis 3 in the clockwise direction and a CCW signal 32 having intersected angles alpha, alpha' formed in the counterclockwise direction are arranged as an azimuth adjusting signal 30. Thus, the upper and lower heads can be assembled with high productivity and assembling accuracy.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to an alignment disk for a double-sided head drive, and particularly to an alignment disk used for adjusting upper/lower head assemblies or drive assemblies in a magnetic disk drive device. Suitable for high-density drive devices of 100TPi (rack/inch) or more,
This invention relates to an alignment disk for double-sided head drives that allows highly accurate adjustment work.

[Background of the invention]

A conventional example is the Japanese Patent Publication No. 59-71 filed by BASF.
A track diameter adjustment signal was written in the "magnetic recording disk for adjustment and control" described in Publication No. 42, and it was possible to adjust the track diameter direction in the drive device.

However, it does not generally include all of the track diameter adjustment signals, index timing adjustment signals, azimuth adjustment signals, etc. necessary for data compatibility in magnetic disk drive devices. However, it can be said that the guarantee of data compatibility of high-density drive devices is not yet guaranteed, and there is still room for further improvement.

Next, another conventional example will be described with reference to FIG. 5, which is a plan view showing the arrangement of signals on an alignment disk according to the conventional example.

That is, the alignment disk 50 is provided with an index timing adjustment signal 51 on the outer track,
As a track diameter adjustment signal 52 to the center track,
From the central axis 53, the specified dimension is approximately ε = 0.1 mm
A large diameter signal 54 that is eccentrically larger than the reference diameter by approximately δ/2 = 0.075 mm, and a small diameter signal 55 that is smaller by the same dimension.
The azimuth adjustment signal 56 is applied to the inner track using a detection method using a so-called cat's eye signal.
Provided by cw signal 57 and CCW signal 58, ID
X is the index timing detection point.

Note that the CW multiplied signal is a signal that is angled in the clockwise direction, and the CcW signal is a signal that is angled in the counterclockwise direction.

Also, approximately the same -
This is the signal in which the following signals are written.

Using this method, it is possible to check the adjustment of the drive assembly, but it is also possible to check the track radial direction (X direction) and index of the upper and lower heads of the upper/lower head assembly shown in Fig. 7, which will be described later. Adjustment signals in the timing direction (Y direction) and azimuth direction (θ direction) are each in separate tracks, and are particularly dense for 100 TPi class or higher, which requires assembly accuracy in the X, Y, and θ directions. When assembling upper/lower head assemblies, for example, fine adjustments in the X direction often result in changes in the Y and θ directions, and it takes a long time to assemble to the required assembly accuracy. If you need it and try to improve the assembly accuracy,
Since the assembly time increases exponentially, assembly accuracy above the level of a chip cannot be achieved, and improvements have been desired from the perspective of improving productivity.

[Purpose of the invention]

In order to assemble and adjust upper/lower head assemblies for 100TPi class or higher with high productivity in accordance with the above requirements, the present invention has been developed to truss in the radial direction (X direction) on the same track.
Adjustment signals in the index timing direction (Y direction) and azimuth direction (θ direction) are arranged appropriately so that, for example, changes in the Y and θ directions caused by fine adjustment in the X direction can be detected at the same time. The object of the present invention is to provide an alignment disk for a double-sided head drive that can reduce time and improve assembly accuracy.

[Summary of the invention]

The structure of the alignment disk for a double-sided head drive according to the present invention is such that the alignment disk for a double-sided head drive adjusts at least a magnetic disk drive having two heads on an upper surface and a lower surface for one disk. As the diameter adjustment signal, an inner circumference side signal and an outer circumference side signal are arranged which extend geometrically alternately to the inner circumference side and the outer circumference side from the specified adjustment signal track center line,
Still, (b) as an index timing adjustment signal,
A timing signal that appears after a predetermined time after index timing detection is arranged on the adjustment signal track center line, and (c) an azimuth adjustment signal is arranged clockwise with each radius line extending from the center axis on the adjustment signal track center line. The CW multiplied signal written with the R/W head with a specified intersection angle, the R/W signal with the specified intersection angle when turned counterclockwise.
This is an alignment disk in which CCW signals written by a W head are arranged, and each of the signals (a), (b), and (c) described above is provided on the upper and lower surfaces of the disk. It is something.

To add more information, the following points are in order.

That is, in the present invention, on the same track, the first
Track diameter adjustment signal 10 in the figure. Index timing adjustment signal 20. The azimuth adjustment signal 30 is arranged, and in particular, as the track diameter adjustment signal lO, an inner circumference side signal 11 and an outer circumference side signal 12 which geometrically extend alternately to the inner circumference side and the outer circumference side from the specified adjustment signal track center line 2 are arranged. 4 to 9 as a pair
Six pairs are arranged symmetrically with respect to the central axis 3.

Further, an adjustment signal track center line 2 is applied as an azimuth adjustment signal 30 to the gap between each of the 4 to 96 adjacent pairs.
A Cw signal 31 written by an R/W head having a prescribed intersection angle clockwise with each radius line extending from the central axis 3,
One set is the ccw signal 32 written in the R/W field having a specified intersection angle when turned counterclockwise, and at least one set, usually 4 to 96 sets, are arranged alternately with the track diameter adjustment signal 10. This is what I did.

According to the above, on the same track, track diameter adjustment signal 1
0. The index timing adjustment signal 20 and the azimuth adjustment signal 3o can be arranged, and therefore, by using the alignment disk for a double-sided head drive according to the present invention, the upper/lower head assembly can be assembled with high productivity.
It is also designed to improve assembly accuracy.

[Embodiments of the invention]

Embodiments of the alignment disk for a double-sided head drive according to the present invention will be described with reference to the drawings. .

First, FIG. 1 is a plan view showing the arrangement of signals on an alignment disk for a double-sided head drive according to an embodiment of the present invention, and FIG. Should be.

FIG. 3 is a state diagram showing the reproduced waveform of the lower head assembly on an oscilloscope.

In FIG. 1, on the adjustment signal track center line 2 of the alignment disk 1 for a double-sided head drive, the track diameter adjustment signal lO according to (a) is arranged geometrically alternately on the inner circumference from the adjustment signal track center line 2. Inner circumferential side signal 11 extending to the side and outer circumferential side. Eight pairs of signals 12 on the outer circumferential side are arranged symmetrically with respect to the central axis 3.

In addition, index timing adjustment signal 2 related to (b)
0, on the adjustment signal track center line 2, the specified time T(
(See FIG. 2) After that, the timing signal 21 is placed.

Further, as the azimuth adjustment signal 30 according to (b), each radius line t extending from the center axis 3 on the adjustment signal track center line 2 and a prescribed intersection angle α' in a clockwise direction.

CW signal 31 written by R, /W head with α
, CCW signals 32 written counterclockwise by a R/W head having prescribed intersecting angles α, α' are set as one block pair, and eight pairs are arranged alternately with the eight pairs of track diameter adjustment signals 10 described above.

The above-mentioned intersection angles α' and α are the angles formed by the line connecting the central axis 3 and each radius line t and the longitudinal line of the gap of the signal writing head.

Further, substantially the same signal is written on the back side of the alignment disk 1 for a double-sided head drive.

In the alignment disk 1 for a double-sided head drive with this configuration, signals are written by a signal writing device 60 shown in FIG. 6, which is a schematic perspective view of an alignment signal writing device.

That is, the alignment disk 1 for a double-sided head drive is rotatably supported by a shaft 61.
The distance between the center of the shaft 61 and the signal writing head 65 can be optically measured using a length measuring machine A64, and when writing, the signal writing device 60
A separate length measuring machine B63 was installed to enable dimension measurement with the double-sided head drive alignment disc 1 installed.
is arranged as a signal writing device 60 with high reproducibility.

Here, a case will be described in which the upper/lower head assembly 70 shown in FIG. 7 is adjusted using the double-sided head drive alignment disk 1 shown in this embodiment.

7(A) is a side sectional view of the upper/lower head assembly, and FIG. 7(B) is a perspective view in the P direction of FIG. 7(A).

That is, FIG. 7 shows that the upper/lower head assembly 70 has one
The assembly accuracy required for the 00TPi class is shown in a transparent state in the P direction.The lower ↑ Rad 71 and the upper head 72, the track radial direction (X direction) is X = ±10ttm during the day, index timing The direction (Y direction) is y=±5
It is necessary to adjust and assemble the R/W core within 0 μm, and within θυ; ±12′ in the azimuth direction (θ direction), with the gap of the R/W core set as θ with respect to the radius line t extending from the central axis 3.

Therefore, the upper/lower head assembly 70 to be adjusted is
Incorporate into the adjustment drive, install alignment disk 1 for double-sided head drive, and see above.

Good luck to each of the lower heads, the oscilloscope 40
If shown above, the pattern at the beginning of the index timing (1/8th round) will be as shown in FIG.

Although it is different, the upper side of FIG. 2 electrically displays the positional relationship between the upper head and the lower side of the lower head, and the following can be determined.

(The in-track radial direction (X direction) is VRl, A/v
From the relationship between RLB and VRUA/VRua, X=±10
Whether or not it is allowed for μm.

(b) Whether or not the index timing direction (Y direction) is allowed to be within a deviation amount Δt, h, y = ±50 μm in the upper and lower heads of the rising point of the timing signal 21.

(c) Azimuth direction (θ direction) is Vσt, A/Vσ
From the relationship between [, II and oUA/vθUn, the azimuth angles θL and θU of the R/W gap of the upper and lower heads
= Is it allowed within ±12'?

Therefore, assembly accuracy in the X, Y, and θ directions can be displayed on a single oscilloscope 40.

In general, when making fine adjustments in the X, Y, and θ directions for upper/lower head assemblies, for example, if you make fine adjustments in the X direction, the accuracy in the Y and θ directions will necessarily change as well. X, Y
, θ directions can be checked simultaneously on the same oscilloscope 40, which greatly reduces the time required to temporarily assemble and adjust the upper and lower heads.
0 TP It becomes possible to realize higher precision assembly, which is required when the density is higher than that of the i class.

For example, in the example of the 100 TPi class, the conventional method shown in FIG.
It took 3 to 10 minutes to adjust the lower head assembly to the assembly accuracy shown in Fig. 7, but in the method using the double-sided head drive alignment disk shown in Fig. 1 according to this embodiment, the required time was 3 to 10 minutes. This can be significantly shortened.

Next, FIG. 3 is a plan view showing the arrangement of signals on an alignment disk for a double-sided head drive according to another embodiment;
FIG. 4 is a state diagram showing the reproduced waveforms of the upper and lower head assemblies to be adjusted on an oscilloscope when the alignment disk of FIG. 3 is used.

3, in addition to the adjustment signal track center line 2 shown in FIG. 1, an adjustment signal track center line A4 is provided, and on this adjustment signal track center mA4 there is a track diameter adjustment signal. The feature is that only 10 are arranged.

On the adjustment signal track center line A4 according to this embodiment,
If the lower head assembly 70 is moved, using the signal of one rotation of the alignment disk IA for double-sided head drive,
On the oscilloscope 40, only signals in the track radial direction (the It is possible to easily discriminate within a certain X=±10 μm.

In addition, in FIG. 1, a special signal is provided to define the specified time T related to the index timing adjustment signal, but this specified time T is, for example, the point at which the track diameter adjustment signal 1o rises. Alternatively, it is also possible to use the point at which the azimuth adjustment signal 30 rises.

Furthermore, although the embodiment of FIGS. 1-4 describes adjustment of the upper/lower head assembly 70, it is of course possible to use this for adjustment and inspection of the drive assembly at the same time.

According to the above embodiment of the present invention, the alignment disk for double-sided head drive 1. On the adjustment signal track center line 2, which is one track of LA', in the track radial direction (
Upper/lower heads used in high-density drive devices of 100 TPi or more. The assembly accuracy required for the assembled product can be displayed on a single oscilloscope, and the current adjustment accuracy for each required accuracy of X, Y, and θ can be fed back, making it easy to assemble and adjust the upper and lower heads. It is possible to significantly shorten the time, and also to provide a highly accurate upper/lower head assembly that can be used even if higher density is required in the future.

Furthermore, it is of course possible to adjust and inspect the drive assembly using the same alignment disk for double-sided head drives.

〔Effect of the invention〕

According to the present invention, upper/lower for 100TPi class or higher
In order to assemble and adjust the lower head assembly with high productivity, it is possible to assemble and adjust the lower head assembly in the track radial direction (X direction, island index timing direction (Y direction)) on the same track.

By properly arranging the adjustment signal in the azimuth direction (θ direction),
For example, it is possible to provide an alignment disk for a double-sided head drive that can simultaneously detect changes in the Y and θ directions caused by fine adjustment in the X direction, thereby reducing assembly time and improving assembly accuracy. This invention can be called an invention with excellent practical effects.

[Brief explanation of the drawing]

Figure 1 shows the fruit of the present invention 7I! FIG. 2 is a plan view showing the arrangement of signals on the alignment disk for a double-sided head drive according to example i, and FIG. 3 is a plan view showing the arrangement of signals on the alignment disk for a double-sided head drive according to another embodiment, and FIG. 4 is a state diagram showing the arrangement of signals on the alignment disk for a double-sided head drive according to another embodiment. Above to be adjusted in case. FIG. 5 is a plan view showing the arrangement of signals on a conventional alignment disk. FIG. 6 is a schematic perspective view of an alignment signal writing device. 7(A) is a side sectional view of the upper/lower head assembly, and FIG. 7(A) is a perspective view in the P direction of FIG. 7(A).

Claims (1)

[Scope of Claims] 1. In an alignment disk for a double-sided head drive that adjusts a magnetic disk drive having two heads on an upper surface and a lower surface for at least one disk, (a) as a track diameter adjustment signal, The inner and outer signals are arranged geometrically alternately extending from the center line of the adjustment signal track to the inner and outer sides, and (
(b) As an index timing adjustment signal, the timing signal is arranged so that it appears on the adjustment signal track center line after a specified time has elapsed after the index timing is detected, and (c) As an azimuth adjustment signal, the adjustment signal is arranged on the track center line. The CW signal written by the R/W head has a specified intersecting angle clockwise with each radius line extending from the central axis, and the R/W signal has a specified intersecting angle counterclockwise with each radius line.
This is an alignment disk in which CCW signals written by a W head are arranged, and each of the signals (a), (b), and (c) described above is provided on both the top and bottom surfaces of the disk. An alignment disk for double-sided head drives characterized by: 2. In the product described in claim 1, the track diameter adjustment signal is a track diameter adjustment signal that is arranged geometrically extending alternately to the inner circumference side and the outer circumference side from the specified adjustment signal track center line. 4 to 9 as a pair of side signal and outer circumferential side signal
An alignment disk for a double-sided head drive, in which six pairs are arranged symmetrically about a central axis. 3. In the device described in claim 1, the azimuth adjustment signal is an R/R signal having a prescribed intersecting angle clockwise with each radius line extending from the center on the adjustment signal track center line.
The CW signal written by the W head and the CCW signal written by the R/W head having a prescribed intersecting angle in a counterclockwise direction are set as one set, and 4 to 96 sets are formed. An alignment disk for double-sided head drives that is arranged symmetrically about the central axis. 4. In the item described in claim 1, the timing signal is arranged as the index timing adjustment signal so that it appears on the adjustment signal track center line after a specified time after the index timing is detected. An alignment disk for a double-sided head drive that utilizes the signal rising point of a track diameter adjustment signal or an azimuth adjustment signal. 5. In the device described in claim 1, in addition to providing a track diameter adjustment signal, an index timing adjustment signal, and an azimuth adjustment signal on the adjustment signal track center line, another adjustment signal track center on another track is provided. An alignment disk for a double-sided head drive, in which a line is provided, and only a track diameter adjustment signal is placed on the center line of this separate adjustment signal track.