JPH06349036A - Method for adjusting disk drive head - Google Patents

Abstract

PURPOSE:To provide a disk drive adjusting method capable of shortening an adjusting time of a head and of precisely adjustment. CONSTITUTION:A disk 3 for adjustment provided with a track 4 formed in a concentric circular for the center of the rotation is loaded on the disk drive, and the head 1 of the disk drive is faced on the track 4. Then, the deviation in an azimuth direction being the deviation in a rotation direction of the head 1 for the track 4 in a plane parallel to the surface of the disk 3, and the deviation in an index direction being the deviation of the head 1 in the tangential direction of the track 4, and the deviation in a cat eye direction being the deviation of the head 1 in the radial direction of the disk 3 are detected respectively. Then, the position of the head 1 related to these three directions is adjusted while considering the influence on the deviation in remaining two directions when the deviation in these three directions are adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an optical disk drive,
The present invention relates to a method for adjusting a head in a disk drive such as a floppy disk drive, and more specifically, a method for adjusting the position of the head.

[0002]

2. Description of the Related Art FIG. 4 is a plan view showing a disk drive head and a disk. In the figure, 1 is a head having a head chip 2, 3 is a disk, and a track 4 is formed on the disk 3 so as to be concentric with the center of rotation of the disk 3.
The head chip 2 writes information to the track 4 and reads information from the track 4.

By the way, in the head 1, in the plane parallel to the disk surface of the disk 3, a shift in the rotational direction with respect to the track 4 (this is called a shift in the azimuth direction) and a shift in the tangential direction of the track 4 ( This is called a shift in the index direction) and a shift in the radial direction of the disk 3 (this is called a shift in the cat's eye direction).

FIG. 5 shows this in relation to the center of rotation of the adjustment jig, which is the fulcrum of adjustment of the head 1.
When the head 1 is deviated in the azimuth direction, the index direction, or the cat's eye direction, the rotation center O of the adjustment jig, which is the fulcrum of the adjustment of the head 1, is moved in the three directions to interlock with the adjustment jig. Adjust the position of the head 1.

[0005]

By the way, when adjusting the deviation of the head 1 in the azimuth direction, the index direction, and the cat's eye direction, the adjustment in each direction has conventionally been performed one item at a time. The three directions are related to each other, and when the head 1 is moved in the azimuth direction, the position of the head 1 also moves in the index direction and the cat's eye direction. Therefore, there is a drawback that it takes time to adjust each item. In addition, there is a problem in accuracy when a human makes a manual adjustment while looking at the measuring instrument.

The present invention has been made in view of the above background, and an object of the present invention is to provide an adjusting method of a disk drive head which can shorten the adjusting time of the head and can perform accurate adjustment. To do.

[0007]

In order to achieve the above object, according to the present invention, an adjusting disk having tracks formed concentrically with respect to a rotation center is mounted on a disk drive, and the head of the disk drive is mounted. The azimuth direction deviation, which is the deviation in the rotational direction of the head with respect to the track in a plane parallel to the disk surface of the adjusting disk, and the deviation of the head with respect to the tangential direction of the track. The deviation in the index direction and the deviation in the cat's eye direction, which is the deviation of the head with respect to the radial direction of the adjusting disk, are respectively detected, and the detected deviation of the head in the azimuth direction, the index direction, and the cat's eye direction is detected. Adjusting the position of the head in that direction based on the deviation in one of these directions And further assuming the amount of displacement of the head in the other two directions when the position of the head is adjusted in the one direction by the calculated amount of adjustment, the estimated amount of displacement In consideration of the above, the adjustment amount of the position of the head in each of the other two directions is calculated,
A position of the head with respect to the track is simultaneously adjusted in three directions of the azimuth direction, the index direction, and the cat's eye direction based on the calculated adjustment amounts of the head in the azimuth direction, the index direction, and the cat's eye direction. It is characterized by having done.

[0008]

In the present invention, when adjusting the displacement of the head with respect to the track in the azimuth direction, the index direction, and the cat's eye direction, the remaining two directions are adjusted when the position of the head in one of these directions is adjusted. Assuming in advance the effect on the head deviation with respect to, the head position is adjusted in each direction after calculating the adjustment amount of the head position in the remaining two directions, the index direction and the cat's eye direction are adjusted. The adjustment of the deviation in the directions does not hinder the adjustment of the deviations in the other directions, and it is not necessary to perform the position adjustments in the remaining two directions each time the position adjustments in each direction are performed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a flowchart showing a method for adjusting a disk drive head according to the present invention. In addition, FIG.
Elements that are the same as the above are given the same reference numerals as those given in FIG. 4, and their explanations are omitted.

When adjusting the head 1, first, the adjustment amount in the azimuth direction is calculated (S1). Next, the adjustment amount in the index direction is calculated in consideration of the shift amount in the index direction caused by the adjustment in the azimuth direction (S
2). Further, the adjustment amount in the cat's eye direction is calculated in consideration of the amount of deviation in the cat's eye direction caused by the adjustment in the azimuth direction (S3). Finally, the position of the head 1 is adjusted by simultaneously moving the adjusting jigs in the three directions of the azimuth direction, the index direction, and the cat's eye direction (S).
4).

Next, a method of calculating the adjustment amount will be described. FIG. 2 is an explanatory diagram showing values such as a deviation amount which is a reference for calculating the adjustment amount, and FIG. 3 is an explanatory diagram showing an adjustment direction of the head.

In FIG. 2, R is the distance from the adjustment point (center of rotation) to the center of the head chip 2, r is the distance from the center of the disk motor to the center of the head chip 2 at the present time, θm, and the rotation angle at the present time. θx: Deviation between adjustment axis and head chip 2 N: Disk motor rotation speed C: Cat's eye deviation (measured value) i: Index deviation (measured value) a: Azimuth deviation (measured value) θd: Current deviation angle Δx; Amount to move in X direction Δy; Amount to move in Y direction Δθ; Adjustment amount in θ direction (adjustment amount in azimuth direction) ΔX; Adjustment amount in X direction (adjustment amount in index direction) ΔY; Y direction Adjustment amount (adjustment amount in the cat's eye direction) P1; current position of the head chip 2 P2; position where the adjustment in the θ direction is best P3;

Here, in P1 of FIG. 1, θd = (i × 2πr × N / 60) / r = (2πN / 60) i Δθ = a-θd = a- (2πN / 60) i ... ( 1) Δx = R · sin (θm) + R · sin (θx) = R {sin (θm) + sin (Δθ−θm)} Δy = R · cos (θm) −R · cos (θx) = R {cos ( [theta] m) -cos ([Delta] [theta]-[theta] m)} [Delta] X = [Delta] x-r * sin ([theta] d) = r * sin (2 [pi] Ni / 60) -R {sin ([theta] m) + sin ([Delta] [theta]-[theta] m)} ... (2) [Delta] Y = R−r · cos (θd) −Δy + C = r {1-cos (2πNi / 60)} − R {cos (θm) −cos (Δθ−θm)} + C (3).

Therefore, when the head 1 is simultaneously moved by the amount calculated by the above equations (1), (2) and (3), the head 1 is moved.
2 moves to the position P3 in FIG. 2, and the position adjustment of the head 1 in one direction can be performed without hindering the position adjustment of the head in the other two directions. Therefore, it is not necessary to perform the position adjustment in the remaining two directions again each time the position adjustment in each direction is performed, and the adjustment time of the head 1 can be shortened.

In this embodiment, the above formula (1),
Although it is assumed that the head 1 is simultaneously moved by the amount calculated by (2) and (3), if the head 1 is moved by the amount calculated by these equations (1), (2) and (3), The head 1 may be sequentially moved in three directions of the azimuth direction, the index direction, and the cat's eye direction.

[0016]

As described above, according to the present invention,
An adjusting disk having tracks formed concentrically with respect to the center of rotation is mounted on a disk drive, the head of the disk drive is exposed on the track, and a disk surface of the adjusting disk of the head with respect to the track is formed. A shift in the azimuth direction that is a shift in the rotational direction in parallel planes, a shift in the index direction that is a shift of the head with respect to the tangential direction of the track, and a cats that is a shift of the head with respect to the radial direction of the adjusting disk. The shift amount in the eye direction is detected, and based on the shift in any one of the detected shifts in the azimuth direction, the index direction, and the cat's eye direction, the adjustment amount of the position of the head in that direction. Is calculated, and the calculated adjustment amount is 1
The other two when adjusting the position of the head in one direction
Assuming the displacement amount of the head in one direction, the adjustment amount of the position of the head in each of the other two directions is calculated in consideration of the estimated displacement amount, and the calculated azimuth direction and index direction are calculated. , And the position of the head with respect to the track is adjusted simultaneously in the three directions of the azimuth direction, the index direction, and the cat's eye direction based on the adjustment amount of the head in the cat's eye direction. It is possible to shorten and perform accurate adjustment.

[Brief description of drawings]

FIG. 1 is a flowchart showing a method for adjusting a disk drive head according to the present invention.

FIG. 2 is an explanatory diagram showing values such as a shift amount serving as a reference for calculating an adjustment amount.

FIG. 3 is an explanatory diagram showing an adjustment direction of a head.

FIG. 4 is a plan view showing a disk drive head and a disk.

FIG. 5 is an explanatory diagram showing the relationship between the displacement of the head in the azimuth direction, the index direction, and the cat's eye direction, and the center of rotation of the adjustment jig, which is the fulcrum of head adjustment.

[Explanation of symbols]

 1 head 2 head chip 3 disk 4 track

Claims (1)

[Claims] 1. An adjustment disk having a track formed concentrically with respect to a center of rotation is mounted on a disk drive, a head of the disk drive is made to face the track, and the adjustment of the head with respect to the track is performed. Deviation in the azimuth direction, which is the deviation in the rotational direction in a plane parallel to the disk surface of the disk, the deviation in the index direction, which is the deviation of the head with respect to the tangential direction of the track, and the head with respect to the radial direction of the adjusting disk. And a deviation in the cat's eye direction, which is a deviation of the head, based on the deviation in any one of the detected head deviations in the azimuth direction, the index direction, and the cat's eye direction. Of the adjustment amount of the position of When the position of the head is adjusted in the direction of, the amount of displacement of the head in the other two directions is assumed, and the position of the head in the other two directions is considered in consideration of the estimated amount of displacement. The adjustment amount is calculated respectively, and the position of the head with respect to the track is set to the azimuth direction, the index direction, and the cat's eye direction based on the calculated adjustment amount of the head with respect to the azimuth direction, the index direction, and the cat's eye direction. The method for adjusting a disk drive head is characterized in that adjustment is made in three directions.