JPS63288480A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To record a timing signal having a uniform magnetization inversion phase by intermittently moving a magnetic head in case of recording of continuous timing signals in the diametral direction of a magnetic disk and setting an extent of one movement to a prescribed value shorter than the width of a track 1 and recording the signals in respective stop positions. CONSTITUTION:In case of preliminarily recording of the continuous timing signals in the diametral direction of a magnetic disk 13, a magnetic head 10 is intermittently moved. The extent of one movement is set to a prescribed value shorter than the track width and the timing signals are recorded in respective stop positions. Thus, the timing signal is so recorded that an accurate output waveform can be obtained independently of the position of the magnetic head 10 at the time of reproducing even if a line l connecting a center (c) of the read/write gap of the magnetic head 10 and a pivot 12 is not orthogonal to the read/write gap.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a magnetic disk device such as a hard disk drive device used as a peripheral storage device of a computer, and more particularly, to a magnetic disk device such as a hard disk drive device used as a peripheral storage device of a computer, and more particularly, to a magnetic disk drive device such as a magnetic disk drive device that is used as a peripheral storage device of a computer. It is designed so that it can be recorded.

(Prior Art) Generally, in a magnetic disk device, as shown in FIG. 4 or 5, a magnetic disk 2 is housed in a housing 1.
By rotating the head arm 3 around the pivot 4 while rotating at high speed, the magnetic head 6 attached to the tip of the head arm 3 via the gimbal arm 5 is moved relative to a predetermined position on the magnetic disk 2. It is designed to record and play back signals by moving it to .

Further, as shown in FIG. 6, a timing signal ST for aligning the start positions of each sector is recorded in the magnetic disk 2 in the radial direction, and the servo signal Ss and data signal S0 are used as a reference for this timing signal Sy@. The information is recorded sequentially in the time axis direction (in the six directions of arrows).

The timing signal ST intermittently moves the magnetic head 6 at a predetermined interval X (X≧track width Tv) in the radial direction (direction of arrow B) with the magnetic disk 2 stopped at a predetermined angular position. It is recorded while being sent to.

(Problems to be Solved by the Invention) By the way, as shown in FIG. 4, a line 1 connecting the center C of the read/write gap of the magnetic head 6 and the pivot 4
When the above-mentioned timing signal S is recorded with a device in which the read/write gap (parallel to straight line a in the figure) is perpendicular to Recorded as a reverse pattern.

Therefore, when reproducing the timing signal ST recorded by such a device, the magnetic head 6 is moved as shown in FIG.
It is possible to obtain a reproduction output of the same phase regardless of the position of the .

However, in such a device, the magnetic head 6
When the magnetic head 6 is located at the innermost track and the outermost track of the disk 2, the yaw angle becomes too large, making it difficult to obtain stable flying characteristics of the magnetic head 6, making it difficult to obtain a good reproduction signal. The problem is that it disappears.

Further, a problem arises in that the output value (peak level) of the reproduced signal changes depending on the position of the magnetic head 6, as shown in FIG.

On the other hand, as shown in FIG. 5, a line 1 connecting the center C of the read/write gap of the magnetic head 6 and the pivot 4,
The above-mentioned yaw angle can be reduced by making the read/write gap not perpendicular to the read/write gap but rather inclined to some extent.

However, when the timing signal ST is recorded with such a device, the timing signal ST is recorded as a magnetization reversal pattern as shown in FIG. 9, so its reproduced output is as shown in FIG. 10. As shown in the figure, the waveform differs depending on the position of the magnetic head 6.

Therefore, there is a problem in that the device requires a special electrical processing circuit for shaping the waveform.

(Means for solving the problems) The present invention has been made in view of the above-mentioned circumstances,
It is an object of the present invention to provide a magnetic disk device capable of recording timing signals with aligned magnetization reversal phases.

In order to achieve this object, the present invention, as shown in FIG. In a magnetic disk device that moves in the radial direction and records/reproduces signals on the magnetic disk 13 using the magnetic head 10, when prerecording timing signals ST continuing in the radial direction of the magnetic disk 13, The head 10 is moved intermittently, and the amount of feed per time is adjusted to the track width T.
The present invention provides a magnetic disk device characterized in that the timing signal ST is set to a predetermined amount smaller than w, and a timing signal ST is recorded at each stop position.

(Function) According to the magnetic disk device as described above, the magnetic head 1
Even if the straight line 1 connecting the center C of the read/write gap of o and the pivot 12 is not perpendicular to the read/write gap, an accurate output waveform can be obtained during reproduction regardless of the position of the magnetic head 10. The timing signal can be recorded.

Further, according to the magnetic disk device according to the present invention, the yaw angle can be freely corrected, and the dead space based on the shape of the head arm 11 can be reduced.

(Embodiments) Hereinafter, preferred embodiments according to the present invention will be described in detail using FIGS. 1 to 3.

In the magnetic disk drive according to this embodiment, the magnetic disk 13 housed in the housing 15 is rotated at high speed by a spindle motor (not shown), and is also rotated intermittently from outside the magnetic disk drive at predetermined angular positions. It has become so.

The magnetic head 10 also has a gimbal arm 16 at the tip of a head arm 11 that rotates around a pivot 12.
The magnetic head 10 is attached to the magnetic head 10 by intermittently rotating the head arm 11.
can be moved intermittently in the radial direction of the magnetic disk 13 at a predetermined pitch.

In this embodiment, the mounting angle of the magnetic head 10 is adjusted in order to keep the yaw angle within a predetermined value, thereby connecting the center C of the read/write gap of the magnetic head 10 and the pivot 12. Straight line,
It is not orthogonal to the read/write gap.

The range of rotation of the helad arm 11 is regulated by two stoppers 16 and 17, thereby regulating the range of movement of the magnetic head 1o.

Further, a voice coil 18 constituting a voice coil motor is provided on the base end side of the helad arm 11.
By appropriately controlling the access signal supplied to the voice coil 18, the amount of feed of the magnetic head 10 per time can be varied.

When recording the timing signal ST using the magnetic disk device configured as described above, first, the magnetic disk 13 is stopped at a predetermined angular position.

In this state, as shown in FIG.
0 is intermittently moved by a predetermined lx smaller than the track width Tv, and at each stop position, a timing signal ST is supplied to the magnetic head 10 for recording.

As a result, timing signals ST that are continuous in the radial direction are recorded on the magnetic disk 13 as a magnetization reversal pattern as shown in FIG.

The reproduced output of the timing signal Sv recorded in this manner has the same phase and output level regardless of the position of the magnetic head 10, as shown in FIG.

In this way, if the timing signal ST is recorded in the magnetic disk device according to this embodiment, the read/write gap will be orthogonal to the straight line 1 connecting the center C of the read/write gap of the magnetic disk 13 and the pivot 12. Even if the magnetic head 10 is not set, it is possible to obtain a reproduction output with the same phase and output level regardless of the position of the magnetic head 10 during reproduction.

Note that the above predetermined amount X is 1 of the track width Tw as a result of an experiment.
It has been found that it is preferable to make the ratio larger than /10 and smaller than 1/2.

That is, if the predetermined lx is larger than 1/2Tw, it becomes difficult to obtain a uniform playback output, and conversely, if the predetermined lx is larger than 1/2Tw, it becomes difficult to obtain a uniform reproduction output.
Even if it is made smaller than 0TW, the effect obtained will not be improved any further.

(Effects of the Invention) As is clear from the above description, according to the present invention, the read/write gap is made perpendicular to the straight line connecting the center of the read/write gap of the magnetic head and the pivot in order to correct the yaw angle. Even if this is not possible, timing signals can be recorded and reproduced so that a reproduction output with the same phase and output level can be obtained during reproduction regardless of the radial position of the magnetic head.

Further, according to the present invention, the degree of freedom in correcting the yaw angle within a limited space is increased, so that various functional components such as a magnetic head and a head arm can be efficiently housed.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing the main parts of an embodiment according to the present invention, and FIG.
The figure also schematically shows the recording pattern (magnetization reversal pattern) of the timing signal, FIG. 3 similarly shows the reproduction output waveform of the timing signal, and FIGS. 4 and 5 respectively show the conventional magnetic disk device FIG. 6 is a diagram schematically showing a general signal format; FIG. 7 is a diagram schematically showing a recording pattern of a timing signal recorded by the magnetic disk device shown in FIG. 4; 8 is a diagram showing the reproduced output waveform of the timing signal recorded as shown in FIG. 7, and FIG. 9 is a diagram schematically showing the recording pattern of the timing signal recorded by the magnetic disk device shown in FIG. 5. , FIG. 10 is a diagram showing the reproduced output waveform of the timing signal recorded as shown in FIG. 9. 10... Magnetic head, 11... Head arm, 12
...Pivot, 13...Magnetic disk. v1 diagram stem 2 leaf 3 star 10 diagram

Claims (2)

[Claims] (1) A head arm with a magnetic head attached to the tip side is rotated around a pivot to move the magnetic head in the radial direction of the magnetic disk, and the magnetic head records and reproduces signals on the magnetic disk. In the magnetic disk device, when pre-recording timing signals continuous in the radial direction of the magnetic disk, the magnetic head is moved intermittently, and the amount of each feeding is set to a predetermined amount smaller than the track width, A magnetic disk device characterized in that a timing signal is recorded at each stop position. (2) the predetermined amount is larger than 1/10 of the track width;
2. The magnetic disk device according to claim 1, wherein the magnetic disk device is made smaller than 1/2.