JPS6316814B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention generally relates to a magnetic disk device serving as an external storage device for a computer, and specifically relates to a magnetic head suspension system that eliminates pitching of a magnetic head caused by access operations of the magnetic head. Regarding the mechanism.

In recent years, the storage capacity of magnetic disk devices has increased, and along with the miniaturization of the devices, there has been a demand for improvements in storage density and reliability. In order to meet these requirements, the slider of the magnetic head must have good ability to follow a magnetic storage medium, such as a flexible magnetic disk, and must always maintain a correct posture when facing the disk. In the operation of writing or reading information in such a magnetic disk device, the magnetic head first approaches the surface of the rotating magnetic disk from a perpendicular direction to a writing/reading distance (hereinafter referred to as magnetic head). This operation is performed by moving the magnetic head in the radial direction of the disk in order to change tracks on the magnetic disk surface (this operation is hereinafter referred to as the seek operation of the magnetic head). During such an access or seek operation, a mechanical unbalance force is generated in the magnetic head, which may cause an undesirable phenomenon of so-called pitching or rolling of the magnetic head. . Here, pitching means that the magnetic head slider moves in the seek direction (radial direction of the disk at the magnetic head position).
The lateral movement refers to the movement in which the magnetic head slider rotates around the axis in the disk running direction at the magnetic head position.

In the suspension mechanism of a conventional magnetic head slider, geometrical symmetry is generally considered, but mechanical symmetry is not considered. For example, as schematically shown in FIG. 1, the front edge side 1a and the rear edge side 1b of the magnetic head slider 1 are respectively two leaf springs 2a of the same size and symmetrical with respect to the center line 9 of the slider in the seek direction, 2b, and the other end 2c of the spring is attached to a head holder (not shown). Note that the direction of arrow F in FIG. 1 represents the running direction of the magnetic disk. As described above, in the conventional magnetic head slider suspension mechanism, the center line 9 of the head slider 1 in the seek direction is located within the plane of symmetry of the leaf spring. The actual center of gravity of the assembled magnetic head slider 1 is located at a position offset from the plane of symmetry of this suspension mechanism. FIG. 2 is a diagram of the magnetic head viewed from the seek direction, when the magnetic head slider 1 fixed to the leaf spring 2 accesses from the rest position A to the accessing position B to the write/read position C. This figure shows the attitude of the slider in detail. The center of gravity plane 5 of the slider center of gravity 4 and the symmetry plane 6 of the suspension mechanism shown by a quarter-circular black and white pattern circle
There is a difference of d with respect to the traveling direction F of the magnetic disk 3. In such a suspension mechanism, when the magnetic head slider 1 repeatedly accesses in the direction of arrow V, the slider loses its seek through its center of gravity 4 due to the mechanical imbalance between the inertia of the slider and the access movement of the suspension mechanism. A pitching motion shown by an arrow S occurs around the axis of the direction, and the recording surface of the magnetic disk 3 is damaged at the corner of the slider.
This shortens the durability of magnetic disk drives1
It is one of the causes of

SUMMARY OF THE INVENTION An object of the present invention is to provide a slider suspension mechanism that can prevent the above-mentioned pitching of the magnetic head and improve the life of the magnetic head slider and magnetic disk even when the magnetic head slider is frequently accessed. do.

The gist of the present invention is to make the sum of pitching moments around the center of inertia (equivalent to the center of gravity) due to both the inertial force due to the access movement of the magnetic head slider and the suspension mechanism to be zero. That is,
The magnetic head slider is supported by two dynamically equivalent suspension springs, and the center of gravity plane of the slider (a plane passing through the center of gravity of the slider perpendicular to the disk running direction) is aligned with the plane of symmetry of the suspension mechanism. It is characterized by:

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 3 schematically shows essential parts of an embodiment of the present invention as viewed from the seek direction. As explained with reference to FIG. 1, the magnetic head slider 1 is fixed to the leaf spring 2, and both side parts 2a and 2b of the leaf spring 2 are divided into two dynamically equivalent limbs midway and directed toward a head holder (not shown). It's growing. The center of the quarter-circular black and white pattern circle is the center of gravity 4 of the magnetic head slider 1 when the electromagnetic converter is incorporated, and the plane passing through this center of gravity and perpendicular to the running direction F of the magnetic disk 3 is the center of the leaf spring 2. This is the plane of geometrical symmetry 6 of the suspension mechanism. That is, the slider center of gravity plane 5
and the plane of symmetry of the suspension mechanism 6 coincide with each other. This prevents the pitching motion of the magnetic head slider due to the access movement in the V direction, prevents damage to the flexible magnetic disk 3 due to the corners 1c, 1d, etc. of the head slider, and prevents the magnetic head slider from being damaged. It also prevents damage to itself. In this embodiment, the geometric plane of symmetry 7 of the magnetic head slider 1 does not coincide with the plane of symmetry 6 of the suspension mechanism.

FIG. 4 shows another embodiment of the present invention, in which a balance weight 8 is attached to the magnetic head slider 1, and the total mass center 4 of the magnetic head slider 1 and this balance weight 8 is The structure is such that the position of the center of gravity (center of gravity) is within the plane of symmetry 6 of the suspension mechanism consisting of the leaf spring 2. Furthermore, the geometrical symmetry plane 6 of the suspension mechanism and the geometrical symmetry plane 7 of the magnetic head slider coincide. The advantage of this embodiment is that pitching due to the access movement can be prevented as in the previous embodiment, and the entire structure has geometric symmetry in the seek direction.
Manufacturing is simplified, and in a so-called double-sided floppy disk device in which both sides of a flexible magnetic disk are used as recording surfaces, the same parts can be used for the magnetic heads on each side of the flexible magnetic disk, and costs can be reduced accordingly. At the point.

In each of the above embodiments, the center of gravity of the magnetic head slider is located within the plane of the suspension spring (in the embodiment shown in FIG. 4, the center of gravity of the slider is located within the plane of the suspension spring). ), it is also possible to prevent lateral vibrations caused by seek operations.

As explained above, the present invention has the effect of preventing pitching motion accompanying an access operation by providing mechanical symmetry to the magnetic head slider and its suspension mechanism, and as a result, the magnetic head slider and magnetic disk The lifespan of can be dramatically increased.

[Brief explanation of the drawing]

FIG. 1 is a schematic perspective view of a general magnetic head used in a magnetic disk device, FIG. 2 is a side view of a conventional magnetic head showing a pitching state due to an access movement, and FIG. 3 is a side view of the conventional magnetic head according to the present invention. 4 is a schematic side view showing one embodiment of the present invention. FIG. 4 is a schematic side view showing another embodiment of the present invention. 1... Magnetic head slider, 1a... Front edge side,
1b... Trailing edge side, 2... Leaf spring (suspension spring), 3
...Magnetic disk, 4...Slider center of gravity, 5...
Slider gravity center plane, 6... Suspension mechanism symmetry plane, 7...
Slider symmetry plane, 8... Balance weight, F... Disk running direction, V... Access direction.

Claims (1)

[Claims] 1. In a magnetic head suspension mechanism that has a plane of symmetry perpendicular to the running direction of the magnetic storage medium and supports the leading edge side and the trailing edge side of the magnetic head slider with two dynamically equivalent suspension springs, A suspension mechanism for a magnetic head, wherein the center of gravity of the magnetic head slider lies within the plane of symmetry.