JPH0296988A - Access mechanism for rotary disk type recording device - Google Patents

Abstract

PURPOSE:To damp the vibration of a head arm by utilizing an internal energy loss caused by the shear deformation of a viscoelastic body without deteriorating the head positioning performance, and to prevent residual vibrations after access by pressing the head arm with force acting in the direction perpendicular to the head positioning direction by using the viscoelastic body. CONSTITUTION:At the time of accessing to a carriage 22, the carriage 22 is moved in the radial direction of a disk 10 by means of a voice coil motor not shown in the figure under the linear guidance of a bearing also not shown in the figure. When a head arm 13, support spring 12, and magnetic head 11 coupled with the carriage 22 are accessed in the radial direction at a high speed, residual vibrations appear in the direction Z perpendicular to the surface of the disk 10, but the vibrations are suppressed by means of a plate spring 1 and viscoelastic body 2. Mover, although the arm 13 vibrates in the direction Z when the driven direction of the carriage 22 is (x), the vibration of the arm 13 can be damped by the viscoelastic body 2 only, since the plate spring 1 is parallel with the directions X and Z. Thus reading and writing errors are reduced by making the displacement of the head in the accessing direction smaller.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an access mechanism for a rotating disk type recording device.
In particular, the present invention relates to an access mechanism equipped with a head arm vibration isolation mechanism.

[Conventional technology]

Regarding the head arm vibration damping mechanism of a rotating disk type recording device, Japanese Utility Model Application Laid-Open 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 Application Laid-Open No. 63 -76162 publication has the following information:
A linear access mechanism in which a friction damping mechanism is provided on the side surface of the head arm is disclosed.

[Problem to be solved by the invention]

In the conventional vibration prevention mechanism described above, no consideration is given to thermal deformation of the magnetic damping material, head position deviation due to changes over time, and abrasion powder generated in the friction damping mechanism.

These problems will be explained in detail below.

FIG. 7 shows a conventional rotary access mechanism with damping material pressed against it. A damping material 2e is pressed against the head arm 13e in the head positioning direction (arrow direction) by a spring material 1e. The temperature of the access mechanism depends on the operating conditions,
It varies depending on the environment in which the magnetic disk device is placed. When the damping material is thermally deformed due to the temperature change, the head arm is deformed in the positioning direction as shown in FIG. Furthermore, damping materials have the property of hardening and increasing their rigidity over time. At this time as well, the force with which the damping material presses the hendoor t1 changes, causing deformation of the head arm in the positioning direction as shown in FIG.

Further, FIG. 9 shows a linear type access mechanism provided with a conventional friction damping mechanism. A beam structure 1f is attached to the head arm 13f, and one end of the beam serves as a friction damping mechanism 3o. In this three-piece structure, [4 millet powder] is generated due to friction.

When the abrasion powder adheres to the magnetic head slider, the flying height of the magnetic head fluctuates and the read signal becomes unstable.

An object of the present invention is to provide an access mechanism equipped with a head arm vibration isolation mechanism that does not undergo thermal deformation, change over time, or generate wear debris.

[Means to solve the problem]

The above-mentioned problems include a reading and/or writing 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 a carriage that drives the carriage. An access mechanism of a rotary disk type recording device including an actuator that acts as an actuator is provided with 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. This is achieved by making the direction of action of the spring force perpendicular to the head positioning direction.

Further, the access mechanism of the rotating disk type recording device according to claim 1, wherein the direction of action of the spring force is parallel to the storage medium surface of the rotating disk.

Further, the access mechanism of the rotating disk type recording device according to claim 2 may be used, in which the spring means that applies spring force to the plurality of head arms is integrally formed. , at least one of which has a different size.

Further, a reading and/or writing 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; An access mechanism of a rotating disk type recording device including a spring means having one end fixed to the head arm and the other end applying a spring force to the carriage via a viscoelastic body, the spring means having an action of the spring force. The rotating disk type recording according to claim 5, wherein the direction of the spring force is perpendicular to the head positioning direction, and the direction of action of the spring force is parallel to the storage medium surface of the one-rotation disk. It may also be an access mechanism for the device.

Claim 1 further characterized in that the viscoelastic body is fixed to the spring means.
The access mechanism of the rotating disk type recording device according to any one of claims 1 to 6, wherein the viscoelastic body is fixed to the head arm, may also be an access mechanism of the rotating disk type recording device according to any one of claims 1 to 4, wherein the viscoelastic body is fixed to the head arm. The access mechanism of a rotating disk type recording device according to any one of claims 5 and 6 may be provided, in which the elastic body is fixed to the carriage.

Further, the viscoelastic body may be used as an access mechanism of a rotating disk type recording device according to any one of claims 1 to 4, wherein the viscoelastic body is fixed to the spring means and the head arm. The present invention may also be used as an access mechanism of a rotating disk type recording device according to claims 5 and 6.

Furthermore, the spring means may be used as an access mechanism of a rotating disk type recording device in which a viscoelastic body is fixed to one end of the spring means.

[Effect]

When the head arm vibrates in a direction that is not parallel to the direction of action of the spring force, a frictional force is generated between the viscoelastic body and the head arm, and the viscoelastic body is sheared and deformed by this frictional force. Due to the energy loss caused by this shearing 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 spring force applied through the viscoelastic body changes due to thermal deformation or hardening of the viscoelastic body, the deformation of the head arm caused by the change is a deformation in the direction perpendicular to the head positioning direction, The effect on positioning error is minimal. Furthermore, since energy loss due to sliding friction between the head arm and the viscoelastic body is not used to damp vibration, there is no generation of abrasion powder due to sliding friction.

Because it does not utilize the smooth friction of a viscoelastic body,
Even if the viscoelastic body is fixed to the spring means, the head arm, or both, internal energy loss due to shear deformation occurs in the same way, and the vibration of the head arm is damped.

〔Example〕

An embodiment in which the present invention is applied to a magnetic disk recording device will be described below with reference to FIGS. 1 and 2.

A magnetic head slider including a magnetic head 11 is supported by a support spring 12 on each medium surface of a plurality of magnetic disks 10 arranged concentrically with storage medium surfaces parallel to each other. The magnetic head 11 is a read/write head capable of reading and writing. The support spring 12 is engaged with the head arm 13, and the four head arms are arranged in the arm mounting portion 21 of the carriage 22 in a direction perpendicular to the storage medium surface of the disk 1o, and are attached to the screw 23.
are connected by. In the arm attachment portion 21, a comb-shaped plate spring 1 serving as a spring means is attached to the head arm 1.
3 are fastened with screws 4 via spacers 3 with comb-shaped teeth facing each other in parallel. A viscoelastic body 2 is attached to each end of the comb-shaped teeth of the leaf spring 1, and the viscoelastic body 2 is pressed against the side surface of the head arm 13 by the spring force of the comb-shaped teeth of the leaf spring 12. ing.

During access, the carriage 22 is linearly guided by a bearing (not shown), and is driven in the radial direction of the redisk 10 by a voice coil motor (not shown), which is an actuator. When the carriage 22 is moved in the radial direction of the disk 10, the head arm 13 connected to the carriage 22 is moved by the support spring 12. The magnetic head 11 also moves in the radial direction. When access is performed at high speed, vibrations of the head arm 13 in the Z direction (direction perpendicular to the surface of the disk 10) appear as residual vibrations after the access.

This residual vibration is suppressed by the leaf spring 1 and the viscoelastic body 2.

Assuming that the direction in which the carriage 22 is driven (radial direction of the disk 10) is the X direction, when the head arm 13 vibrates in the Z direction, the leaf spring 1 is approximately parallel to the xz plane,
Since it is rigid in the X2 plane, the viscoelastic body 2 is attached to the head arm 1.
Shear deformation occurs due to the frictional force between the three side surfaces and the viscoelastic body 2. The direction and magnitude of the frictional force change as the head arm 13 vibrates, and the amount of shear deformation of the viscoelastic body 2 also changes, but due to hysteresis when the amount of shear deformation changes,
Energy is consumed in the viscoelastic body 2, and vibrations of the head arm 13 are damped. Note that the vibration of the head arm 13 is approximately 1 klLz, and the viscoelastic body 2 deforms along with this vibration, so that no slippage occurs between the side surface of the head arm 13 and the viscoelastic body 2.

Further, the leaf spring 1 presses the viscoelastic body 2 against the side surface of the head arm with a force in the y direction, that is, a force in a direction perpendicular to the positioning direction. The temperature around the head arm 13 changes,
When the viscoelastic body 2 is thermally deformed or hardened, the force of the leaf spring 1 applied to the head arm 13 changes, but since the direction of the applied force is perpendicular to the positioning direction, the effect on displacement in the head access direction is small. , magnetic head reading a
No errors occur.

In this embodiment, fluorine rubber is used as the viscoelastic body 2, and this rubber is baked onto the leaf spring 1.

According to this embodiment, the positioning performance of the magnetic spatula 1 does not deteriorate due to temperature changes, and vibrations are attenuated by internal energy loss due to shear deformation of the viscoelastic body. The residual vibration after access is damped. Furthermore, according to this embodiment, the leaf springs that engage the plurality of head arms are formed in one piece in the shape of comb teeth, so the number of parts is reduced.
Assembly has become easier.

FIG. 3 is a plan view of a second embodiment of the present invention applied to a rotary type access mechanism. One end of the leaf spring 1 is connected to the carriage 22a by a screw 4a, and the leaf spring 1
A viscoelastic body 2 is attached to the other end, and the viscoelastic body 2 is pressed against the biased portion of the head arm 13a with a force in the y direction, that is, a force in a direction perpendicular to the positioning direction. A support spring 12 is coupled to the tip of the head arm 13 at right angles to the longitudinal direction of the head arm 13, and a magnetic head slider 11 is coupled to the tip of the support spring 12. The carriage 22a is rotated around the quick-movement shaft 25, and the magnetic head slider 11 is moved back and forth in the longitudinal direction of the support spring 12 for positioning.

Also in this embodiment, residual vibration after access of the head arm is suppressed without deterioration of positioning performance due to temperature change and without generation of abrasion powder.

FIG. 4 is a diagram showing a third embodiment of the present invention applied to a linear access mechanism. This embodiment differs from the first embodiment in that the size of the comb teeth of the leaf spring 1 is not the same, but the other things are the same, that is, the viscoelastic body 2
The rigidity and pushing force of the comb teeth of the leaf spring that presses the head arm 13 against each head arm 13 are changed for each head arm.

According to this embodiment as well, the residual trembling of the head arm after access is suppressed without deterioration of the positioning performance of the magnetic head due to temperature changes and without generation of abrasion powder. Furthermore, according to this embodiment, since the pressing force of the leaf spring 1b differs for each head arm, the rigidity of the viscoelastic body 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.

FIG. 5 shows a fourth embodiment in which the present invention is applied to a linear access mechanism. The arm attachment of the carriage 22 of the head arm 13C is performed using a leaf spring I near the joint with the part 21.
C is provided, and this plate spring is engaged with the arm attachment portion 21 via the viscoelastic body 2c. Viscoelastic body 2
The arm attachment C is connected to the part 21, and the leaf spring I
Due to the frictional force acting between C and C, it is sheared and deformed and absorbs energy. The other components are the same as those shown in the first embodiment, and their explanation will be omitted. Similarly to the first embodiment, this embodiment also suppresses residual vibration after access of the head arm without deteriorating the positioning performance due to temperature changes and without generating abrasion powder. Since the spring can be integrated with the head arm, the number of parts can be reduced.

FIG. 6 shows a fifth embodiment of the present invention, in which a surface (not shown) of the head arm 13 parallel to the medium surface of the storage medium (
The viscoelastic body 2d is attached to the upper surface), and the head arm is attached in two directions (
(perpendicular to the surface of the storage medium). The X direction in the figure is the moving direction of the carriage (the positioning direction of the magnetic head), and in this embodiment as well, the direction in which the leaf spring acts is perpendicular to the positioning direction, so the positioning performance is not deteriorated due to temperature changes. First, residual vibrations after access are suppressed.

In the first to fifth embodiments described above, an example was 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 both the leaf spring and the head arm or carriage. It may be fixed. Further, in each of the above embodiments, the magnetic disk record B
Although an example in which the present invention is applied to a device is shown, the present invention is not necessarily limited to a magnetic disk recording device, but can also be applied to, for example, an access mechanism of a recording device using an optical disk.

〔Effect of the invention〕

According to the present invention, since the viscoelastic body is pressed against the head arm with a force acting in a direction perpendicular to the head positioning direction, a vibration occurs between the head arm and the viscoelastic body as the head arm vibrates. The viscoelastic body undergoes shear deformation due to frictional force, and internal energy loss due to the shear deformation causes residual vibration of the head arm after access, without deterioration of head positioning performance due to temperature changes and without generation of abrasion powder. It has the effect of suppressing

In addition, by making the spring used for pressing the viscoelastic body into a leaf spring structure, it can be made rigid in the direction perpendicular to the direction in which the spring acts, and the shear deformation of the viscoelastic body can be increased, resulting in a large loss of energy. The damping effect can be further increased.

Furthermore, the number of parts can be reduced by implanting a single plate spring that engages a plurality of head arms via a viscoelastic body.

Furthermore, by changing the magnitude of the load that presses the head arm for each arm, the natural frequency of each head arm can be made different, thereby reducing the vibration energy and vibration amplitude at the resonance point.

Furthermore, the number of parts can be reduced by configuring the spring integrally with the head arm, one end of which is fixed to the side surface of the head arm and the other end of which engages with the carriage via a viscoelastic body.

[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 the second embodiment of the invention, FIG. 4 is a perspective view showing the third embodiment of the invention, and FIG. 5 is a plan view showing the third embodiment of the invention. FIG. 6 is a plan view showing the fourth embodiment of the present invention, FIG. 6 is a side view showing the fifth embodiment of the present invention, and FIG.
．． Figure 8.9 is a plan view showing a conventional head arm vibration isolation mechanism. 1... Spring means (plate spring), 2... Viscoelastic body. DESCRIPTION OF SYMBOLS 10... Rotating disk, 11... Reading and/or writing head (magnetic head), 13... Head arm, 22... Carriage.

Claims (1)

[Claims] 1. A reading and/or writing 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 a positioning direction, and the carriage. In an access mechanism of a rotating disk type recording device including an actuator that drives the
One end is fixed to the carriage, and the other end is provided with a spring means that applies a spring force to the head arm via a viscoelastic body, and the direction of action of the spring force is perpendicular to the head positioning direction. An access mechanism for a rotating disc type recording device characterized by: 2. The access mechanism for a rotating disk type recording device according to claim 1, wherein the direction of action of the spring force is parallel to the storage medium surface of the rotating disk. 3. The access mechanism for a rotating disk type recording device according to claim 2, wherein the spring means for applying a spring force to the plurality of head arms is integrally formed. 4. The access mechanism for a rotating disk type recording device according to claim 2, wherein at least one of the spring forces acting on the head arm has a different magnitude. 5. a reading and/or writing head, a head arm that supports the head, a carriage to which a plurality of the head arms are connected and which guides the movement of the head in the positioning direction, and an actuator that drives the carriage;
An access mechanism for a rotating disk type recording device including a spring means having one end fixed to the head arm and the other end applying a spring force to the carriage via a viscoelastic body, An access mechanism for a rotating disk type recording device, wherein the direction is perpendicular to a head positioning direction. 6. The access mechanism for a rotating disk type recording device according to claim 5, wherein the direction of action of the spring force is parallel to the storage medium surface of the rotating disk. 7. The access mechanism for a rotating disk type recording device according to claim 1, wherein the viscoelastic body is fixed to a spring means. 8. The access mechanism for a rotating disk type recording device according to claim 1, wherein the viscoelastic body is fixed to the head arm. 9. The access mechanism for a rotating disk type recording device according to claim 5 or 6, wherein the viscoelastic body is fixed to the carriage. 10. The access mechanism for a rotating disk type recording device according to claim 1, wherein the viscoelastic body is fixed to the spring means and the head arm. 11. The access mechanism for a rotating disk type recording device according to claim 5 or 6, wherein the viscoelastic body is fixed to the spring means and the carriage. 12. A spring means for an access mechanism of a rotating disk type recording device, characterized in that a viscoelastic body is fixed to one end of the spring means.