JPH0770133B2 - Head support mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a head support mechanism in which a magnetic head for writing information on a magnetic disk and for reading information from the magnetic head is mounted via a gimbal spring. It is about.

[Conventional technology]

Conventionally, for example, Floppy Disk Drive (hereinafter FD
Write as D. In the apparatus, a gimbal spring used for the head support mechanism having one degree of freedom of rotation is disclosed in, for example, Japanese Patent Laid-Open No. 59-79463, and one having two degrees of freedom of rotation is disclosed. , For example, the one shown in FIG. FIG. 4 is a plan view showing a structure of a magnetic head and a gimbal spring in a conventional head support mechanism.
In the figure, (1) is a gimbal spring, (2) is a magnetic head attached to the gimbal spring (1) (hereinafter referred to as a head), and (A) is a rotation of a magnetic disk arranged to face the head (2). The center plane of the head, which is substantially perpendicular to the direction (C), is a plane perpendicular to the paper surface. (B) is a rotation axis of the gimbal spring (1) substantially orthogonal to the rotation direction (C), and the rotation axis (B) is on the center plane (A).

Note that the head (2) is formed at a position (hereinafter referred to as a gear position P) offset by P from the center plane (A) to the upper side in the rotation direction (C) of the magnetic disk.

[Problems to be solved by the invention]

The conventional head support mechanism is configured as described above,
It was thought that stable contact could always be obtained regardless of whether the magnetic disk was rotated or not.

FIG. 5 is a side view showing a state when the magnetic disk is not rotating in the conventional head support mechanism, and is a highly accurate (measurement accuracy ± 0.03 μm or less) clearance measuring device (previous application by the same applicant). , JP-A-61-130807), as a result of the actual measurement, head (2) and magnetic disk (3)
The clearance between and showed a value of h _{0 which} is considered to be almost 0. Sixth
The figure is a side view showing a state in which the magnetic disk is rotating in the direction of arrow (C) in the conventional head support mechanism. In this case, the rotation axis ( The gimbal spring (1) with B) has a rotating shaft (B) due to the dynamic pressure effect by the air flow (arrow (D)).
As the head (2) is rotated around, the upper side of the air flow (D) of the head (2) is pushed up, and the head (2) of the head (2) has a large upper side in the rotating direction (C) and a small clearance on the lower side. It became clear that Therefore, the clearance between the head (2) and the magnetic disk (3) at the gear position P is
Load that pushes the head (2) against the magnetic disk (3) 15
gf becomes h ₀ + Δh _{1 and} increases by Δh ₁ (= 0.05 μm). This increase in Δh ₁ is due to the linear recording density of 30KFRPI in recording / reproducing information on / from the magnetic disk (3).
It causes a large output drop of about 3 dB. Since the amount of output reduction is proportional to the linear recording density, it is clear that it will become a greater problem in achieving higher density recording and reproduction in the future.

As a method to solve such problems, head (2)
A possible method is to increase the load that pushes the magnetic disk (3) against the magnetic disk (3) from the current state, but the wear of the head (2) and the magnetic disk (3) is accelerated, and the life of the FDD and the magnetic disk are shortened. Further, since the frictional force between the head (2) and the magnetic disk (3) increases, the torque of the spindle motor for rotating the magnetic disk must be increased, which leads to a cost increase of FDD. There was a point.

The present invention has been made in order to solve the above problems, and an FDD capable of high-density recording, which is long-lived, inexpensive, and less likely to cause output reduction due to an increase in the clearance between the head and the magnetic disk, is provided. The object is to provide a head support mechanism that can be realized.

[Means for Solving the Problems] In the head support mechanism according to the present invention, the rotation axis of the gimbal spring is positioned so as to be displaced above the center plane of the head in the rotation direction of the magnetic disk.

[Action]

In the head support mechanism according to the present invention, the center plane of the head and the rotation axis of the gimbal spring are deviated, and the rotation axis is located on the upstream side. Therefore, even if the dynamic pressure effect is generated due to the rotation of the magnetic disk, the head is It becomes difficult to push up on the upstream side, and the increase in the clearance with the magnetic head at the head gear position P becomes smaller than in the conventional case.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
FIG. 1 is a plan view showing the structure of a magnetic head and a gimbal spring in a head supporting mechanism according to an embodiment of the present invention, FIG. 2, and FIG. 3 are magnetic head supporting mechanism according to an embodiment of the present invention. It is a side view which shows the state when a disk is not rotating and when rotating.

As shown in the figure, the rotation axis (B) of the gimbal spring (the rotation axis orthogonal to the rotation direction (C) of the magnetic disk (3)) is above the center plane (A) of the head (2) in the rotation direction (C). Is located in.

In such a configuration, when the magnetic disk rotates, the head (2) rotates about the rotation axis (B) of the gimbal spring (1) due to the dynamic pressure effect of the air flow (D), and the gear cap of the head (2) rotates. The clearance at position P is h ₀ + Δh ₂ , but since the rotating shaft (B) is located upstream from the center plane (A), the head (2) is less likely to be pushed up, and Δh ₂ is It is smaller than Δh ₁ . (Δh ₁ >> Δh ₂ ) For example, the amount of deviation of the rotation axis (B) from the center plane (A) of the head (2) is F (joint part; here, the length of 1/13 of the inner diameter E in FIG. 1). The amount of increase in the clearance with the magnetic disk (3) at the gear position P of the head (2) is 15% of that of the conventional one, even if the amount is only a half of the width of
(= 0.0075 μm)

Therefore, in this way, the axis of rotation (B) is aligned with the center plane (A) of the head.
It is considered that locating it further in the rotation direction (C) is very effective as a means for reducing the increase in the clearance between the head (2) and the magnetic disk (3) at the gear position P.

Therefore, the problem of output reduction due to increase in clearance is solved,
Moreover, the life of the magnetic disk and the life of the head are the same as before, and FDD that enables high-density recording without the cost up of FDD.
Can be realized.

Further, the gimbal spring has a rotation spring constant about a rotation axis orthogonal to the rotation direction of the magnetic disk, a rotation spring constant about a parallel rotation axis, and an axis perpendicular to the magnetic disk, as compared with the conventional gimbal spring. Since the translational spring constant along the parallel axes does not change (change is within 1%), the positional relationship between the magnetic disk and the head can be adjusted as usual. You don't have to think about up.

Although the rotating shaft (B) is moved without changing the head position in the above embodiment, the position of the rotating shaft (B) of the gimbal spring (1) is not changed and the center plane of the head is not changed. The same effect can be obtained by mounting the head (2) on the gimbal spring (1) so that (A) is positioned below the rotation axis (B) of the gimbal spring in the rotation direction.

〔The invention's effect〕

As described above, according to the present invention, since the rotation axis of the gimbal spring is displaced from the center plane of the head to the upper side in the rotation direction of the magnetic disk, the rotation of the magnetic disk causes the gear shift position to shift. An increase in the clearance between the magnetic disk and the head is suppressed, and a head support mechanism that has a long life, is inexpensive, and can realize FDD capable of high-density recording can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view showing the structure of a magnetic head and a gimbal spring in a head support mechanism according to an embodiment of the present invention, and FIGS. 2 and 3 are magnetic views of a head support mechanism according to an embodiment of the present invention. FIG. 4 is a side view showing a state in which the disk is not rotating and a state during rotation, FIG. 4 is a plan view showing a structure of a magnetic head and a gimbal spring in a conventional head supporting mechanism, and FIGS. FIG. 6 is a side view showing a state in which the magnetic disk is not rotating and is rotating in the head supporting mechanism of FIG. (1) ... Gimbal spring, (2) ... Magnetic head, (3) ...
Magnetic disk In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A magnetic head for writing information to a magnetic disk and reading information from the magnetic disk,
The gimbal spring is mounted via a gimbal spring so as to have a degree of freedom of rotation around an axis of rotation of the gimbal spring that is substantially orthogonal to the rotation direction of the magnetic disk, and the magnetic disk is rotated when the magnetic disk rotates. In the magnetic head mounted so that the air inflow side of the magnetic head floats by the air flow caused by the rotation of the disk, the rotation axis of the gimbal spring is substantially orthogonal to the rotation direction of the magnetic disk of the magnetic head. A head support mechanism, wherein the head support mechanism is positioned so as to be displaced to the upper side in the rotation direction of the magnetic disk from the center plane.