JPS5936325A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To improve easily and assuredly the accuracy of an azimuth angle, by exercising control to obtain the maximum output of reproduction by turning a magnetic head to a track in response to the reproduction output of the signal recorded to a recording medium. CONSTITUTION:A head assembly 2 including a head chip part 1 is supported rotatably toward an arrow (a) to the housing base part. Then the part 2 is turned slightly by applying the voltage to a piezoelectric element 4 which is fixed at one of its sides. The angle of this rotation responses directly to an azimuth angle and can be controlled with the voltage applied to the element 4. Therefore an optimum azimuth angle is obtained by reproducing a sink part which is previously recorded with equidistant bit lengths and then stopping the rotation of the assembly 2 at a time point when the reproduced signal has the maximum amplitude. Thus it is possible to improve easily and assuredly the accuracy of an azimuth angle.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a disk device, such as a floppy disk device, in which the medium can be exchanged.

Conventional Structures and Problems There has been a remarkable increase in the recording capacity of magnetic disk drives in recent years, and efforts are being made to significantly increase the linear density and l/rack density.

When increasing the linear density in a magnetic disk device in which the medium can be exchanged, such as a floppy disk device and some rigid disk devices, the relative azimuth of the magnetic head of the device used for recording and the magnetic head used for reproduction is It is known that if the angles are different, a so-called azimuth angle loss occurs, resulting in a reduction in reproduction output. This azimuth angle tolerance depends on the linear density and 1-rack width used. An example of this is shown in FIG. Figure 1 shows 165μ
This calculation example assumes a trunk width of m and a sinusoidal magnetization distribution of the medium, and shows that at high linear density, it is necessary to match the azimuth angles of the magnetic heads with high precision. For example, at 10 KBPI (bits per inch), the output decreases by 20 in approximately 0.63 seats (approximately 38 minutes);
To meet the KBPI, it takes 0.31 degrees (19 minutes), respectively.
o・21 degrees (13 minutes) and 0.137 degrees (8 minutes).

As mentioned above, in conventional magnetic disk drives that use a fixed azimuth angle, it is necessary to In some cases, the above IIV, (
It had the disadvantage of limiting the upper limit of the linear density used.

OBJECTS OF THE INVENTION It is an object of the present invention to eliminate the drawbacks of the prior art described in 1-1 and to obtain high azimuth angle accuracy.

Structure of the Invention In order to achieve the above objectives, the present invention rotates the magnetic helenoid 1- with respect to the track according to the output of the signal recorded on the recording medium, and automatically rotates the magnetic head 1- with respect to the track so that the playback output is maximized. It is something to control.

FIG. 2 is a schematic view showing the moving parts of the head housing sink, and the head assembly 2 including the head chip section 1 is shown in the direction of the arrow a with respect to the housing sink base section that supports it.
It is supported so that it can rotate in the direction. 3 is the air gap of the magnetic head. Here, in order to prevent the I-rank position from changing by rotating the head assembly 2, the center of rotation of the head assembly 2 with respect to the Hound base section is located above the gap in the head tip section 1. Do it like this.

Note that the magnetic head 1-'' is usually the magnetic disk medium 1-''.
If the housing sink base section is fixed to a movable base that moves arbitrarily in the radial direction, or if the housing sink base is fixed to the movable base -1- in this embodiment, the track search mechanism can be replaced with the conventional one. It may be the same as . In FIG. 2, 5 is a disk medium and 6 is a predetermined track thereof.

Furthermore, the head assembly 2 is driven by applying a voltage to the piezoelectric element 4, one of which is fixed, and rotates slightly. The arrows in FIG. 2 indicate the direction of expansion and contraction of the piezoelectric element 4. This rotation angle directly corresponds to the azimuth angle, or it can be arbitrarily controlled by the voltage applied to the element 4.

Next, an example of a method for adjusting the azimuth angle of the magnetic head will be described.

Normally, a magnetic disk medium has an area (r) recorded at equal bit lengths that corresponds to the sync.

? ;t, before using the magnetic disk medium, this sync section is reproduced in advance and this re-41. The optimal azimuth angle 1 is achieved by rotating the signal to its maximum amplitude and stopping the rotation of the hexagonal assembly 2 at the point where the nail raw signal reaches its maximum amplitude.

Another adjustment method is to average all the information signals recorded on the magnetic disk medium and stop the head assembly 2 from rotating so that the amplitude becomes maximum. '-i1' function.

Next, a second embodiment of the azimuth adjustment method will be described with reference to FIG.

Azimuth angle adjustment tracks 8 and 9 are provided in advance on the inner or outer circumferential side of the information recording area 7 of the magnetic disk 5. Prior to the use of the magnetic disk medium 5, an irises are planted from track 8 or 9 of the 1-J self-adjustment month, and the same as in the first embodiment (fixed to the nail at the optimum azimuth angle) is used. Effects of the Invention The present invention has the above configuration, and according to the present invention, the following are achieved.
-The effect of - can be obtained.

(a) It is possible to easily and accurately automatically achieve the high azimuth angle accuracy between the magnetic tinook devices required when using a high linear density and changing the gradient of the medium.

(b) 11V of the magnetic head at the time of manufacturing the magnetic Dinuk device;
It is easy to manufacture because the accuracy can be lower than the same level as the conventional method.

The gist of the present invention is to automatically optimize the azimuth angle of the magnetic head in a magnetic disk device according to the magnetic disk medium, and the present invention is based on the rotation mechanism of the magnetic head and its method for generating power. The magnetic head type is not limited to any particular type, and can be applied to perpendicular recording heads, for example.

[Brief explanation of drawings]

Figure 1 shows the azimuth angle 19 of the magnetic head during recording and playback 1.
Indicating the reduction of re-tooth output at different times/I7, r1 wax:
FIG. 2 is a diagram showing the results, FIG. 2 is a schematic diagram of a main part of a magnetic disk device in one embodiment of the present invention, and FIG. 3 is a top view of a magnetic disk in another embodiment of the invention. 1...Head chip part, 2...Head assembly, 3...Gap, 4...Piezoelectric element, 5...
...Magnetic disk medium, 6. ・1-rack, 7.
...Information recording area, 8,9...Track for adjusting the Ashimanu angle. Name of agent B1 Sodo Satoshi Nakao 93 and one other person Figure 1 o o, 1 θ2 03 0.4 Q5 0.6
0.7 azimuth angle deviation (Fig. 3)

Claims (1)

[Claims] It is equipped with a magnetic head supported by a rotary iEJ so that the angle at which the disk medium is raked in the running direction of the disk medium can be changed, and a driving means for rotating the magnetic flux head. 1. A magnetic disk device, characterized in that the recording magnetic head is used for reproduction and the magnetic head is fixed at an angle that maximizes the reproduction output.