JPH04168671A - Magnetic disk unit and its access mechanism - Google Patents

Abstract

PURPOSE:To prevent a change in the floating amount of a head by installing a means one end of which is fixed to a carriage and the other end of which exerts a springy force on a head arm via a viscoelastic body. CONSTITUTION:Plate springs 1a, 1b as spring means are fastened respectively to an arm attachment part 21 via spacers 3a, 3b; viscoelastic bodies 2a, 2b are attached to their end parts; the viscoelastic bodies 2a, 2b are pressed to side faces of a head arm 13 by the springy force of the plate springs 1a, 1b. Consequently, when a torsional vibration is caused at the head arm 13, a momental force is caused in one pair of viscoelastic bodies 2a, 2b which have been pressed to the head arm 13, an energy is lost by the shearing deformation of the viscoelastic bodies 2a, 2b due to the force, the vibration energy of the head arm 13 is absorbed, and the vibration of the head arm 13 is attenuated. Thereby, it is possible to reduce a change in the levitating amount of a magnetic head 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk drive and its access mechanism, and more particularly to a magnetic disk drive equipped with a head arm vibration isolation mechanism and its access mechanism.

[Conventional technology]

Regarding the head arm vibration isolation mechanism of magnetic disk drives,
Japanese Utility Model Application Publication No. 62-124660 discloses a device that presses a damping material against the side surface of the head arm of a rotary type access mechanism, and Japanese Patent Laid-Open No. 63-76162 discloses a device that presses a damping material against the side surface of the head arm of a rotary type access mechanism. A friction damping mechanism is disclosed. Also, Unexamined Japanese Patent Publication No. 2-96
Japanese Patent No. 988 discloses a structure in which a viscoelastic body is pressed against a head arm by a spring force, and the direction of the force is perpendicular to the access direction.

[Problem to be solved by the invention]

In the conventional vibration prevention mechanism described above, only the bending vibration mode of the head arm 13 shown in FIG. 6 is suppressed, and no consideration is given to the torsional vibration mode of the head arm 13 shown in FIG. 7. In the conventional vibration prevention structure, when vibration occurs, there is a problem in that the head arm rotates approximately around the damping means provided on one side of the head arm.

The torsional vibration mode of the head arm causes torsional vibration of the head support spring, which causes variations in the position of the magnetic head, that is, variations in the flying height of the head above the disk. This fluctuation not only makes the read signal unstable, but in the worst case, it causes contact between the magnetic head and the magnetic disk, causing damage to the head and the disk.

SUMMARY OF THE INVENTION An object of the present invention has been made to solve the above-mentioned problems, and is to suppress the torsional vibration mode of the head arm of a magnetic disk drive, thereby preventing fluctuations in the flying height of the head.

[Means to solve the problem]

The above objective is achieved by the following means.

An access mechanism includes a read/write head, a head arm that supports the head, a carriage to which a plurality of the head arms are coupled and guides movement of the head in a positioning direction, and an actuator that drives the carriage. (a) one end is fixed to the carriage, and the other end applies a spring force to the head arm via a viscoelastic body;
A magnetic disk device characterized by having an access mechanism equipped with at least one pair of spring means.

(b) one end is fixed to the head arm, and the other end applies a spring force to the carriage via a viscoelastic body;
A magnetic disk device characterized by having an access mechanism equipped with at least one pair of spring means.

Further, a read/write head, a head arm supporting the head, and a plurality of the head arms are combined,
An access mechanism for a magnetic disk drive including a carriage that guides movement of the head in a positioning direction and an actuator that drives the carriage, (c) one end is fixed to the carriage and the other end is made of a viscoelastic body. applying a spring force to the head arm through the
An access mechanism for a magnetic disk device, comprising at least one pair of spring means.

(d) An access mechanism for a magnetic disk drive, wherein a spring means for applying a spring force to the plurality of head arms is integrally formed.

(E) The spring force acting on the plurality of head arms is
An access mechanism for a magnetic disk device, characterized in that at least one piece has a different size.

(f) An access mechanism for a magnetic disk device, wherein the viscoelastic body is fixed to the head arm.

(g) An access mechanism for a magnetic disk drive, characterized in that the viscoelastic body is fixed to the springing means and the head arm.

(h) one end is fixed to the head arm, and the other end applies a spring force to the carriage via a viscoelastic body;
An access mechanism for a magnetic disk device, comprising at least one pair of spring means.

(S) An access mechanism for a magnetic disk drive, wherein the viscoelastic body is fixed to the springing means.

(v) An access mechanism for a magnetic disk device, wherein the viscoelastic body is fixed to the carriage.

(l) An access mechanism for a magnetic disk drive, characterized in that the viscoelastic body is fixed to the spring means and the carriage.

(e) A computer system that uses a magnetic disk device equipped with the above-mentioned access mechanism as a peripheral storage device.

[Effect]

According to the above configuration, the spring is given an initial deformation, and the spring force presses the viscoelastic body against the head arm. When torsional vibration occurs in the head arm, the pair of viscoelastic bodies are pressed against the head arm. The power to deal with the situation arises. When the viscoelastic body undergoes shear deformation due to this force, energy is lost due to the shear deformation of the viscoelastic body, the vibration energy of the head arm is absorbed, and the vibration of the head arm is attenuated.

Even if the viscoelastic body is fixed to the spring means, the head arm, or both, energy loss due to shear deformation occurs in the same way, and the vibration of the head arm is damped.

Further, even when the viscoelastic body is fixed to the spring means, the carriage, or both, energy loss due to shear deformation is attenuated.

〔Example〕

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

(First Embodiment) As shown in FIGS. 1 and 2, a magnetic helad 11 is placed on each medium surface of a plurality of magnetic disks 10 arranged concentrically with the recording medium surfaces parallel to each other. A magnetic rad slider having a magnetic field is supported by a support spring 12. The magnetic head 11 is a read/write head capable of reading and writing. The support spring 12 is the head arm 1
3, and four head arms are connected to the arm attachment portion 21 of the carriage 22 by screws 23 in a line perpendicular to the recording medium surface of the disk 10.

It should be noted that the magnetic herad slider is also referred to as a magnetic head herein.

A plate spring 1a serving as a spring means is attached to the arm mounting portion 21.
are fastened with screws 4a via spacers 3a. A viscoelastic body 2a is attached to the end of the leaf spring 1a, and the viscoelastic body 2a is pressed against the side surface of the head arm 13 by the spring force of the leaf spring 1a. A plate spring 1b having a viscoelastic body 2b at the end thereof is also fastened to the arm attachment part 21 with a screw via a spacer 3b, and the viscoelastic body 2b is attached to the head by the spring force of the plate spring 1b. It is pressed against the side of the arm 13.

During access, the carriage 22 is linearly guided by a bearing (not shown) and driven in the radial direction of the disk 10 by a voice coil motor (not shown) as an actuator. When the carriage 22 is moved in the radial direction of the disk 10, the head arm 13, support spring 12, and magnetic head 11 coupled to the carriage 22 also move in the radial direction.

The direction in which the carriage 22 moves is defined as the X direction, and the direction perpendicular to the disk 1o is defined as two directions. Access is performed at high speed, and during and after access, head arm 1
When torsional vibration occurs in the head arm 3, forces in two opposing directions act on the viscoelastic bodies 2a and 2b, which are opposed and pressed against the head arm. Since the viscoelastic bodies 2a and 2b are rigidly fixed in the Z direction by plate springs la and lb on one side, shear deformation occurs in the viscoelastic bodies, and energy is consumed due to hysteresis at that time, and the head arm 13 vibration is damped.

In this embodiment, fluororubber is used for the viscoelastic bodies 2a and 2b, and this rubber is adhered to the leaf springs la and lb. According to this embodiment, torsional vibration of the head arm 13 is attenuated, and fluctuations in the flying height of the magnetic head 11 can be reduced.

(Second Embodiment) FIG. 3 is a plan view of a second embodiment of the present invention used in a rotary type access mechanism.

One end of the leaf spring la is connected to the carriage 22 by a screw 4a, a viscoelastic body 2a is attached to the other end of the leaf spring la, and the viscoelastic body 2a is pressed against the side surface of the head arm 13. The carriage 22 also includes a leaf spring 1b.
The viscoelastic body 2b is pressed against the side surface of the head arm 13 by the spring force of the leaf spring 1b. A support spring 1 is attached to the tip of the head arm 13.
2 are coupled together, and a magnetic head slider 11 is coupled to the tip of the support spring 12.

Also in this embodiment, the torsional vibration of the head arm 13 is attenuated, and the fluctuation in the flying height of the magnetic head 11 can be reduced.

(Third Embodiment) FIG. 4 is a diagram showing a third embodiment of the present invention used in a linear access mechanism.

This embodiment differs from the first embodiment in that the leaf spring 1 is provided with comb teeth of different sizes, and the other points are the same. That is, the viscoelastic body 2 is attached to each head arm 1.
The rigidity and pressing force of the comb teeth of the leaf spring that press against the head arm 3 are changed for each head arm.

Also in this embodiment, the torsional vibration of the head arm can be attenuated, and the fluctuation in the flying height of the magnetic head can be reduced.

Furthermore, according to this embodiment, since the pressing force of the leaf spring 1a or 1b differs for each head arm, the rigidity of the viscoelastic body 2a or 2b also differs. Therefore, since the natural frequency of each head arm differs due to the difference in the boundary conditions of the head arm, the vibration energy level at the resonance point of the head arm becomes small, and accordingly, the vibration amplitude also becomes small.

(Fourth Embodiment) FIG. 5 shows a fourth embodiment of the present invention used in a linear access mechanism.

To attach the head arm 13c to the carriage 22, a plate spring 1c is provided near the joint with the part 21, and this plate spring 1c is attached to the part 2 through the viscoelastic body 2c.
1. The viscoelastic body 2c is connected to the arm attachment portion 21, and is sheared and deformed by the frictional force acting between it and the leaf spring 1c, and absorbs energy. The other components are the same as those shown in the first embodiment, and their explanation will be omitted.

Also in this embodiment, as in the first embodiment, it is possible to attenuate the torsional vibration of the head arm and reduce fluctuations in the distance between the magnetic head and the disk. Further, according to this embodiment, since the leaf spring can be integrated with the head arm, the number of parts can be reduced.

(Other Examples) In the first to fourth embodiments described above, examples were shown in which the viscoelastic body 2 was fixed to the head arm, the carriage, or the leaf spring, but the viscoelastic body 2 was fixed to the head arm, the carriage, or the leaf spring. It may be fixed to both the arm or the carriage.

(Application Example) FIG. 8 shows a computer system that uses a magnetic disk device equipped with the above-mentioned downstream access mechanism as a peripheral storage device.9 A highly reliable computer system can be provided by the present invention.

Further, although the above embodiments all show examples of magnetic disk recording devices, the present invention is not necessarily limited to magnetic disk recording devices, but can also be applied to, for example, an access mechanism of a recording device using an optical disk.

〔Effect of the invention〕

As described above, according to the present invention, initial deformation is applied to the leaf spring,
The spring force presses the viscoelastic body against the head arm, and when torsional vibration occurs in the head arm, the viscoelastic body is sheared and deformed to dissipate energy, damping the vibration of the head arm, and raising the magnetic head. Quantity fluctuations can be reduced.

[Brief explanation of drawings]

FIG. 1 is a perspective view of the first embodiment of the present invention, and FIG. 2 is a perspective view of the first embodiment of the present invention.
FIG. 3 is a plan view showing a second embodiment of the present invention; FIG. 4 is a perspective view showing a third embodiment of the present invention;
FIG. 5 is a plan view showing a fourth embodiment of the present invention, FIGS. 6 and 7 are perspective views showing vibration modes of the head arm, and FIG. 8 is a conceptual diagram showing an example of application of the present invention. DESCRIPTION OF SYMBOLS 1... Spring means (plate spring), 2... Viscoelastic body, 10... Time disk, 11... Magnetic head (head slider) 13... Head arm, 22... Carriage.

Claims (1)

[Claims] 1. A read/write head, a head arm that supports the head, a carriage to which a plurality of the head arms are coupled and guides the movement of the head in the positioning direction, and a carriage that drives the carriage. an actuator; and at least a pair of spring means having one end fixed to the carriage and the other end applying a spring force to the head arm via a viscoelastic body. A magnetic disk device characterized by having an access mechanism. 2. An access device comprising a read/write head, a head arm supporting the head, a carriage to which a plurality of the head arms are coupled and guiding movement of the head in a positioning direction, and an actuator driving the carriage. In the magnetic disk drive having a mechanism, the access mechanism includes at least a pair of spring means, one end of which is fixed to the head arm, and the other end of which applies a spring force to the carriage via a viscoelastic body. Features of magnetic disk device. 3. A magnetic head including a read/write head, a head arm that supports the head, a carriage to which a plurality of the head arms are coupled and which guides the movement of the head in the positioning direction, and an actuator that drives the carriage. An access mechanism for a disk device, comprising at least a pair of spring means, one end of which is fixed to the carriage and the other end of which applies a spring force to the head arm via a viscoelastic body. Device access mechanism. 4. The access mechanism for a magnetic disk drive according to claim 3, wherein the spring means for applying a spring force to the plurality of head arms is integrally formed. 5. The access mechanism for a magnetic disk drive according to claim 3, wherein at least one of the spring forces acting on the plurality of head arms has a different magnitude. 6. The access mechanism for a magnetic disk drive according to claim 3, wherein the viscoelastic body is fixed to the head arm. 7. The access mechanism for a magnetic disk drive according to claim 3, wherein the viscoelastic body is fixed to the spring means and the head arm. 8. A magnetic device comprising a read/write head, a head arm supporting the head, a carriage to which a plurality of the head arms are coupled and guiding the movement of the head in the positioning direction, and an actuator driving the carriage. An access mechanism for a disk device, comprising at least a pair of spring means, one end of which is fixed to the head arm and the other end of which applies a spring force to the carriage via a viscoelastic body. Device access mechanism. 9. The access mechanism for a magnetic disk drive according to claim 3 or 8, wherein the viscoelastic body is fixed to the spring means. 10. The access mechanism for a magnetic disk drive according to claim 8, wherein the viscoelastic body is fixed to the carriage. 11. The access mechanism for a magnetic disk drive according to claim 8, wherein the viscoelastic body is fixed to the spring means and the carriage. 12. A computer system using a magnetic disk device equipped with the access mechanism according to claim 3 to 11 as a peripheral storage device.