JPS63247963A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To extend the life of a magnetic disk by varying an edge width of a constrained plate for contacting with a magnetic disk in accordance with the radial distance of the magnetic disk and keeping a contact pressure constant even if the magnetic head moves in the radial direction. CONSTITUTION:The magnetic disk 3 is rotated by the rotation movement of a center hub 2. A magnetic head 4 acts for the magnetic recording/reproducing, contacting with the disk 3, and also moves in the radial direction in parallel with the surface of the magnetic disk 3 by a carriage 5. A tip of the magnetic head 4 is positioned lower than an upper surface of the disk 3 at the center hub 2, while the head 4 creates a bend of the disk 3 by elastic deformation, and moreover a pad 6 pushes up the disk 3 from the opposite side of the head 4 to increase a pressing force between the head 4 and the disk 3. At that time, the contact areas of the pad 6 with the disk 3 are only two spots of the edge parts A and C in the vicinity of the same radius with that positioned by the head 4, and because of eliminating the contact area B, the disk 3 has a large contact area with a center surface of the tip part of the head 4, so that the pressing force of the head 4 can be minimized.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a magnetic disk support device in a magnetic recording device that performs magnetic recording on a flexible disk such as a magnetic diskette, and particularly relates to a magnetic disk restraining structure near a magnetic head. It is something.

[Conventional technology]

Figure 5 shows, for example, the Technical Report of the Television Society, Vol. 10, 41.
1 is a sectional view showing a conventional magnetic disk device shown in the above issue, in which (1) indicates a spindle that performs rotational motion;
(2) is a center hub attached to this spindle (1), and (3) is a magnetic disk fixed to this center knob (2) by adhesive or the like. (4) is a magnetic head that performs magnetic recording while sliding with this magnetic disk (3), (5) is a carriage that supports this magnetic head (4), and (6) is a magnetic head that performs magnetic recording while sliding with this magnetic disk (3). It's restraining no (rad).

Next, the operation will be explained. The rotational movement of the spindle (1) is transmitted to the magnetic disk (3) via the seventeenth knob (2).
The magnetic head (4) performs magnetic recording and reproduction while contacting the magnetic disk, and the carriage (5) moves the magnetic disk (5) in the radial direction. Move parallel to the plane (6). The pad (6) remains stationary and presses the magnetic disk (6) from the opposite side, thereby maintaining stable contact between the magnetic disk (5) and the magnetic head (4).

FIG. 6 is a perspective view of the vicinity of a curved surface along the radius of the magnetic disk (3) (hereinafter simply referred to as radius refers to the disk) passing through the center of the magnetic head (4). The tip of the magnetic head (4) is set to be located below the upper surface of the magnetic disk (6) in the center hub (2), and the magnetic head (4) causes the magnetic disk (6) to undergo elastic deformation. Causes deflection. Further, the pad (6) is in contact with the magnetic disk (6) on the opposite side of the magnetic head (4), and pushes the magnetic disk (6) against the deflection of the magnetic disk (6) by the magnetic head (4). support. At this time, the shape of the deflection contour height M (S) of the magnetic disk (,
, 21LInl'J] interval) as shown in FIG. Therefore, as shown in FIG. 8, the contact area between the magnetic disk (6) and the pad (6) is (A) near the same radius as the magnetic head (4).

It can be seen that there are three locations: (C) and (B) on the radius passing through the magnetic head (4).

The magnetic bed (4) performs magnetic recording and reproduction on the magnetic disk (3) while moving in the radial direction of the magnetic disk (6). At this time, the HA disk (3) of the magnetic head (4) ) must be kept constant regardless of the radial position of the magnetic head (4).

Now, since the magnetic disk (3) is a disk supported under the boundary conditions of a fixed inner circumference and a free outer circumference, the tip of the magnetic head (4) is positioned a certain amount below the surface of the disk (3). When the magnetic head (4) is moved in the radial direction, this contact pressure decreases as it approaches the outer periphery.

Therefore, in this conventional example, the pad (6) is arranged on the side of the magnetic disk surface opposite to the magnetic head (4), and the reaction force of the contact area (B) (see FIG. 8) causes the outer periphery of the magnetic disk to The contact pressure is restored by correcting the decrease in rigidity of the magnetic disk (3).

However, as shown in FIG. 9 schematically showing the deflection of the magnetic disk (6), due to the influence of the contact area CB), when the magnetic head (4) comes to the position shown in the figure, the magnetic head (
4) makes stronger contact with the magnetic disk (3) and greatly distorts the magnetic disk (6) in the radial direction.Then, the tip of the magnetic head (4) that is deviated from the center plane comes into contact with the magnetic disk (3). Therefore, it cannot be said that the contact between the magnetic head (4) and the magnetic disk (5) is perfect.

Therefore, a larger pressing force is required to achieve complete contact.

[Problem that the invention seeks to solve]

Since the conventional magnetic disk restraint device is configured as described above, the tolerance of the set positions of the device components is small due to the requirement for optimizing the pressing force of the magnetic head (4).
High precision was required for assembly, and there were problems such as large wear on the magnetic disk.

This invention was made to solve the above-mentioned problems, and it is possible to improve the quality of magnetic recording and reproduction and extend the life of the magnetic disk by sufficiently uniformizing the pressing force of the magnetic head (4). The purpose is to obtain a magnetic disk device.

[Means for solving problems]

In the magnetic disk drive according to the present invention, the widths of the two edges of the pad that contacts the magnetic disk for restraining the magnetic disk are tapered outward in the radial direction.

[Effect]

In the magnetic disk restraint mechanism of the present invention, the width of the two edges is made into a tapered shape, so that the third edge (the edge having the contact area B in the conventional example) that supports the outer peripheral edge of the magnetic disk is It becomes unnecessary. namely, the contact area (A).

The deflection of the magnetic disk between (C) is constant, but the t411 property decreases as you move outward in the radial direction.The contact pressure is maintained constant by supporting the disk with two narrower edges. It is from.

Since this third edge is eliminated, substantially no radial deflection angle occurs when the magnetic heald moves toward the outer periphery of the magnetic disk, and therefore no increase in pressing force is required.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be explained with reference to the drawings.
In the figure, (2) is a center hub that is attached to a spindle and rotates, (3) is a magnetic disk fixed to this center hub by adhesive, etc., and (4) is a magnetic disk that slides with this magnetic disk (3). A magnetic head that performs recording conflict reproduction, (5) a carriage that supports this magnetic head (4), and (6) a pad that pushes up and restrains the magnetic disk (5) from the side opposite to the magnetic head (4). be. This pad (6) has tapered edges (7, 8) as shown in FIG.

Note that the top surfaces of the lips (9) and (10') having respective edges are parallel to the magnetic disk surface, and
) does not push the magnetic disk from the opposite side (9)
, (10) The distance between the m-plane and the magnetic disk surface is theoretically zero. This is similar to the conventional pad rep.

Next, the operation will be explained. The magnetic disk (3) rotates due to the four rotational movements of the center hub (2).

The magnetic head (4) performs magnetic recording and reproduction while in contact with the magnetic disk, and is also moved in the radial direction parallel to the surface of the magnetic disk (5) by the carriage (5).

The pad (6) presses and supports the magnetic disk (3) while remaining stationary, bringing the magnetic disk (3) and the magnetic head (4) into contact.

The tip of the magnetic head (4) is set to be located below the upper surface of the magnetic disk (5) in the center hub (2).
6) causes deflection due to elastic deformation. Furthermore, the pad (6) pushes up the magnetic disk (3) from the opposite side 1111 of the magnetic head (4), increasing the pressing force between the magnetic head (4) and the magnetic disk (5).

At this time, as shown in Fig. 2, the contact area of the pad (6) with the magnetic disk (3) is only at the edge portions (A) and (0) near the same radius as the magnetic head (4). be. In other words, since the contact area (B) on the radius passing through the magnetic head (4) has been removed, the magnetic disk (3) is in contact with the center plane of the tip of the magnetic head (4), as shown in FIG. The contact area is large (that is, the surfaces of the magnetic disks are almost parallel) (compare with FIG. 9), and it is possible to reduce the pressing force of the magnetic head (4). Further, since the pad of the present invention does not have an edge having a contact area (B) as in the conventional pad, the positioning tolerance of the head (4) can be made larger than in the conventional pad.

In addition, in the above embodiment, the edge of the pad (6) is shown as having a linear shape, but the tapered shape of the pad (6) may be curved as shown in FIG. Withering effect similar. Of course, the edges are symmetrical with respect to the center line (radial direction) of the pad (6), and it is clear that the magnetic head moves along this center line.

[Effects of the Invention] As described above, according to the present invention, since the width of the edge of the pad (6) that restrains the magnetic disk (6) is configured to vary in the radial direction, the assembly tolerance can be increased. As a result, the mounting RJ can be made inexpensive, and the magnetic head pressing force can be reduced to 1'z, which has the effect of extending the life of the magnetic disk (3).

[Brief explanation of drawings]

FIG. 1 shows a magnetic disk device R according to an embodiment of the present invention.
FIG. 2 is a perspective view of a pad of the present invention, FIG. 5 is a sectional view of a magnetic disk device according to an embodiment of the invention, and FIG. 4 is a perspective view of a pad according to another embodiment of the invention. 5 is a sectional view showing a conventional magnetic disk device, FIG. 6 is a perspective view showing a conventional magnetic disk device, FIG. 7 is a contour diagram of magnetic disk deflection in a conventional magnetic disk device, FIG. 8 is a perspective view showing a pad in a conventional magnetic disk device, and FIG. 9 shows a conventional magnetic disk device! In the MR plane view, (6) is a magnetic disk, (4) is a magnetic head, (6) is a pad, and (1) and (8) are tapered edges. Note that reference numerals in the middle of each drawing indicate the same or corresponding parts. Agent Patent Attorney Masu Oiwa Miscellaneous Figure 1 (Figure 4)

Claims (3)

[Claims] (1) In a magnetic disk device equipped with a magnetic disk restraint mechanism that presses a magnetic disk against a magnetic head from the opposite side, the magnetic disk 1. A magnetic disk drive characterized in that the width of the edge of a contacting restraint plate is changed depending on the radial distance of the magnetic disk. (2) The magnetic disk drive according to claim 1, wherein the width of the edge tapers linearly outward in the radial direction. (3) The magnetic disk device according to claim 1, wherein the width of the edge is tapered outward in the radial direction in a curved manner.