JPS63291276A - Magnetic head positioning device - Google Patents

Abstract

PURPOSE:To reduce the occurrence frequency of malfunction by making an angle formed between the center of a first fixed shaft and the center of a second fixed shaft to an acute angle when the read/write element is positioned on the central cylinder of a magnetic disk. CONSTITUTION:The magnetic head 13 is composed to make it's arm's length, that means, the distance between the read/write (R/W) element 12 and the fixed shaft 4, longer than that of a conventioned one and to make the angle formed between the position 12a when the R/W element 12 is positioned on a central track 1a and the center of the fixed shaft 4 and the center 1p of the magnetic disk 1 to be the acute angle. Therefore as the swaying disk 1 to be the acute angle. Therefore as the swaying angle of the magnetic disk 13 becomes smaller than that of the former one and the angle of the inclination of the R/W element 12 for each track of the magnetic disk 1 becomes small, the reduction width of a write or a read signal becomes small according to that. Thus the occurrence frequency of the malfunction can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic head positioning device for a magnetic disk drive, and in particular to a so-called rotary magnetic head positioning device that positions a magnetic head by nine rotations around a fixed axis. The present invention relates to a Hevdo positioning device.

[Conventional technology]

The drive system of the magnetic head positioning device of the t-th magnetic disk drive that positions the magnetic head on the predetermined seven cylinders of the magnetic disk includes a linear type in which the magnetic head performs linear reciprocating motion, and a drive system in which the magnetic head is fixed on the magnetic head. 211i with a rotating type (swing arm type) that performs rotational movement of the shaft
Among these, the rotary type 8-air head positioning device has a small number of parts and can easily shorten the length of the device.
It is especially frequently used in small magnetic disk drives.

FIG. 2 is a plan view showing the main parts of an example of such a conventional rotary magnetic head positioning device.

In FIG. 2, a magnetic head 3 having a read/write element (几/W element) 2t at its tip moves around a fixed shaft 4t and rotates (arrow A) t to a target cylinder of a magnetic disk l. Then, the R/W resistor 2t-positioning operation is performed. A flat coil 5 is provided at a position generally opposite to the magnetic head 3 with respect to the fixed shaft 4, and the coil 5 is configured to move together with the magnetic head 3.

There are permanent magnets on the top and bottom of this carp/L15.
6 is fixedly disposed, and by supplying a direct current to the coil 5, the rotational movement of the magnetic head 30 is driven by the cooperative action of the coil 5 and the magnet 6.

The magnetic head positioning device configured as described above is driven by the coil 5 and the magnet 6 to rotate in the direction of the arrow to position the magnetic head.
At this time, the range of motion of the R/W holder 2 is the magnetic disk l.
The outermost track 1b (R/W element position is 2b),
Figure 4 is the ninth diagram that completely explains the arrangement relationship between the magnetic head and the disk in the example of Figure 2. In Fig. 4, lP is the center of rotation of mountain head l, 4
a indicates the center of the fixed shaft 4. 1a is the outermost track lb
2a, 2b and 2C are positioned on the center track 1a, the outermost track 1b and the innermost track Ic, respectively, and are located on the center track 1a, the outermost track 1b and the innermost track Ic. Show each position.

The mountain head 3 performs a rotational movement (swinging movement) about the fixed shaft 4 between the outermost track lb and the innermost track IC. Therefore, when the W/W element 2 is positioned on the outermost track xb and when it is positioned on the innermost track Ic, it forms a certain angle on the opposite side with the center of each track. Positioned without. The larger this angle is, the smaller the writing signal of the W/W element 2 becomes, and the more malfunctions occur during recording and reproducing operations.

In order to reduce such malfunctions, the conventional mountain head positioning device m has a position of 11. /W
When the hydrogen element is positioned, the center 4a of the fixed shaft 4 is
At the positioning point 2a of the center track 1a on the center track 1a, the angle Elp・2
Arrange so that a and 4a are right angles, and the angle [2a, 4a,
2b and angles 2a, 4a, and 2C are almost equal to R,
/W element 2 is configured so that the slope thereof is minimized.

The maximum swing n angle (swing angle) θ accompanying the rotational movement (swinging movement) of the magnetic head 30 is equal to the arm length 2 compared to its swing width (the distance between the outermost track 2b and the innermost track 2C).
It is relatively small when a.4a) is relatively long, but increases as the arm length becomes shorter.

[Problem that the invention seeks to solve]

In recent years, magnetic disk drives have become smaller and have larger capacities, and as a result, the length of the above-mentioned arms has become shorter and the swing width has also increased, causing the swing angle of the magnetic head to become larger. Ninth, the swing angle of the R/WJ element has also increased, and the frequency of occurrence of malfunctions in recording and reproducing operations has also increased.

The purpose of the invention is to eliminate the drawbacks of the conventional rotary magnetic head positioning device as described above, reduce the frequency of malfunctions in recording and reproducing operations, and thus create a highly reliable magnetic disk. An object of the present invention is to provide a mountain head positioning device that can obtain a mountain head positioning device.

[The tth method to solve all problems]

The magnetic head positioning device of the present invention includes a magnetic disk that rotates about a first fixed axis, a write/read element that performs an operation of recording or reproducing information on the magnetic disk, and the write/read element. The second fixed shaft is carried at the tip? A magnetic head positioning device comprising: a magnetic head that positions the write/read element on an arbitrary ring between the outermost circumferential cylinder and the innermost circumferential cylinder of the G-air disk by rotational movement about a center.

The write head element is positioned on the core/linda of the magnetic disk fN,t,! :The angle formed by the center of the first fixed shaft and the center of the second fixed shaft is an acute angle.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a plan view showing one embodiment of the present invention, and Fig. 3 is a plan view showing an embodiment of the present invention.
FIG. 3 is an explanatory diagram showing the relationship between a magnetic head and a magnetic disk in the illustrated embodiment.

In FIG. 1, the configurations of the magnetic disk 1, coil 5, magnet 6, and fixed shaft 4 are the same as in the conventional example shown in FIG. 2, but the configuration of the magnetic head 13 is different. That is,
The magnetic head 13 has the length of its arm, that is, the R/W element 12
and fixed shaft 4 longer than that shown in Fig. 2,
The angle (angle α in FIG. 3) formed by the position 12a between the center of the fixed shaft 4 and the center 1p of the magnetic disk l when the L/W element 12 is positioned on the center travku la is an acute angle. It is composed of

With such a configuration, as shown in FIG. 3, the swing width of the R/W element 12 is approximately equal to the distance between the outermost track 1b and the thickest track 1c, and the arm length 4a- 128 is longer than the conventional example, and the swing angle ψ of the magnetic head 13 is also smaller than the swing angle θ of the conventional example shown in FIG. Therefore, since the inclination angle of the R/W element 12 with respect to each track of the magnetic disk l becomes smaller, the amount of decrease in the write signal 7t becomes smaller. In this case, the angle at which the W/W element 12 is attached to the arm of the magnetic head 13 is conventionally set at 7 points (below the line Lf connecting the air gap portion to the point 2a and the fixed shaft center 4a) (see Fig. 2). ) (coinciding with the direction of the normals 1p and 2a) and the center track 1a at point 12a.
(point 1
2a and the fixed axis center 41 are preferably arranged so that they are not perpendicular to the line Mx2a·τaK.

〔Effect of the invention〕

As described above in detail and as follows, the magnetic head positioning device of the present invention can make the swing angle of the magnetic head smaller than that of the conventional one, so that it is possible to reduce the frequency of malfunctions caused by a small write or read signal. Therefore, there is an effect that the reliability of the recording/reproducing operation of the magnetic disk device can be improved.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the main parts of an embodiment of the present invention;
The figure is a plan view showing the main parts of an example of a conventional magnetic head positioning device. Diagram showing. FIG. 4 is an explanatory diagram showing the relationship between the magnetic head and the magnetic disk in the example of the fM2 diagram. l・・・Magnetic disk, 2・12・・mark・几/W
all, foil 1 mouthpiece 2 figure

Claims (1)

[Scope of Claims] A magnetic disk that rotates around a first fixed axis, a write/read element that records or reproduces information on the magnetic disk, and a tip of the magnetic disk that carries the read/write element. and a magnetic head that positions the write/read element on any cylinder between the outermost cylinder and the innermost cylinder of the magnetic disk by rotational movement about a second fixed axis. In the apparatus, when the read/write element is positioned on the central cylinder of the magnetic disk, the angle formed by the center of the first fixed axis and the center of the second fixed axis is an acute angle. magnetic head positioning device.