JPH11238331A - Shock resistant magnetic disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve shock resistant performance of a magnetic disk device by preventing the magnetic disk device from slipping off by shock, and avoiding a damage on the spindle bearing. SOLUTION: A stopping means 15 for stopping a magnetic disk 2 is arranged, and the mechanism is arranged so that the stopping means 15 operates when a magnetic head is moved to a save zone at the time of halting the operation. Thus, since it is possible to avoid a deviation of the magnetic disk 2 and damage on a spindle bearing caused by a lateral shock, a shock resistant performance is improved and a magnetic disk device with a high degree of reliability can be achieved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic disk drive, and more particularly to a highly reliable magnetic disk drive having improved shock resistance.

[0002]

2. Description of the Related Art Magnetic disk drives are widely used as external storage devices for personal computers. As personal computers have become smaller and lighter, their portable performance has become important. Specifically, it is required that the device is not broken by a drop impact even if the device is accidentally dropped when being carried. Magnetic disk drives incorporated in personal computers are also required to have impact resistance.

FIG. 16 is a perspective view of a conventional magnetic disk drive during operation. During operation, the magnetic disk 2 rotated by the spindle mechanism 1 holds the magnetic head 3
Thus, data recording / reproduction is performed. Pivot axis 4
The head actuator movable section 5 rotatably provided around the center has a suspension arm 6 on which the magnetic head 3 is mounted at one end, and a coil 8 supported by a bobbin 7 at the other end. This coil 8 has a magnetic circuit made of a yoke made of a permanent magnet and a magnetic material,
The voice coil motor 9 constitutes a means for moving and positioning the magnetic head 3 at high speed. When the operation of the magnetic disk device is stopped, the magnetic head 3 is stopped at a predetermined position on the surface of the magnetic disk 2.

When an impact is applied to the conventional magnetic disk device by dropping or the like, the magnetic head 3 jumps up from the surface of the magnetic disk 2 and collides with the magnetic disk 2. As a result, there is a problem that the surface of the magnetic disk 2 is damaged or the magnetic head 3 is broken. Therefore, in order to prevent these obstacles, PCT ・ WO ・ 8
As described in 9/08313 (PCT application publication number), when the operation is stopped, the magnetic head 3 is retracted out of the surface of the magnetic disk 2 to prevent a direct collision between the magnetic head 3 and the magnetic disk 2. Has been taken.

FIG. 17 is a plan view showing an example of a magnetic disk drive using the load / unload method. When the operation of the magnetic disk device is stopped, the head actuator movable portion 5 moves toward the outer peripheral edge of the magnetic disk 2 around the pivot shaft 4. The tip of the suspension arm 6
Riding on the inclined surface (load / unload ramp 11) of the load / unload member 12, the magnetic head (not shown)
Is unloaded from the magnetic disk 2 surface. At the time of startup, on the contrary, the tip of the suspension arm 6 descends from the load / unload ramp 11, and the magnetic head is loaded on the surface of the magnetic disk 2. As a result, when the operation of the apparatus is stopped, the magnetic head is prevented from directly colliding with the magnetic disk 2, thereby avoiding damage to the magnetic head and the magnetic disk 2 due to impact. When such a load / unload method is used, the head actuator movable section 5
Is fixed by a lock mechanism attached to the end face, so that it does not easily rotate about the pivot shaft 4.

In Japanese Patent Application Laid-Open No. Hei 8-212738, a motion limiter is provided on a base or a cover in a magnetic disk drive using a load / unload method. The motion limiter dissipates the increase in the vibration amplitude of the magnetic disk due to the impact, thereby avoiding damage to the magnetic disk and damage to the spindle bearing.

[0007]

However, Japanese Patent Application Laid-open No.
In the case of the magnetic disk device described in Japanese Patent Publication No.
Only a method of mitigating an impact input in a direction perpendicular to the magnetic disk surface has been proposed. There is a problem in that the impact that frequently occurs in the handling environment of the portable magnetic disk device is not addressed. That is, in an actual handling environment, not only a shock in a direction perpendicular to the magnetic disk surface but also a shock (lateral impact) input in parallel with the magnetic disk surface exists.

Experiments have revealed that when a shock is applied from the lateral direction, the magnetic disks or the spacers for providing spaces between the magnetic disks are laterally displaced in the direction perpendicular to the spindle axis. As a result, the position of the magnetic data recorded on the surface of the magnetic disk is eccentric with respect to the spindle axis, and the read operation by the magnetic head does not operate normally. Further, when a shock is applied in the lateral direction, the primary resonance frequency (1 kHz or less) of the spindle shaft is excited, and a stress greater than the limit stress is applied to the interface between the race surface of the spindle bearing constituting the spindle shaft and the bearing. . As a result, there is a problem that the spindle bearing is damaged.

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable magnetic disk drive which is free from damages and defects against impacts input from various directions.

[0010]

The above-mentioned object is attained as follows. 2. A shock-resistant magnetic disk drive according to claim 1, comprising a magnetic disk, a spindle mechanism for rotating said magnetic disk, and a head actuator movable portion for moving and positioning a magnetic head along a recording surface of said magnetic disk. In a magnetic disk drive in which the magnetic head moves to an evacuation zone when the operation is stopped, a fixing means for fixing the magnetic disk when the magnetic head moves to an evacuation zone is provided. According to this configuration, since the magnetic disk is fixed, stable performance can be maintained without being damaged by an impact such as a drop. Further, the shock-resistant magnetic disk device according to the present invention comprises a magnetic disk, a spindle mechanism for rotating the magnetic disk, and a head actuator movable section for moving and positioning the magnetic head along the recording surface of the magnetic disk. In the magnetic disk drive in which the magnetic head moves to the retreat zone when the operation is stopped, fixing means for fixing the magnetic disk is arranged on the outer peripheral edge of the magnetic disk, and the magnetic head moves to the retreat zone. When the magnetic disk is moved, the magnetic disk is fixed by the fixing means. According to this configuration, even if an impact is applied from the lateral direction when the operation is stopped, the magnetic disk is fixed, and lateral displacement and resonance of the spindle shaft can be prevented. According to a third aspect of the present invention, there is provided a shock-resistant magnetic disk drive, comprising: a magnetic disk; a spindle mechanism for rotating the magnetic disk; and a head actuator movable unit for moving and positioning a magnetic head along a recording surface of the magnetic disk. The magnetic head moves to an evacuation zone when the operation is stopped, and the head actuator movable part is fixed at a predetermined position in the evacuation zone. Wherein the stopper comes into contact with the side surface of the magnetic disk when the magnetic head moves to the retreat zone. According to this configuration, in conjunction with the head actuator, the magnetic disk can be fixed as the magnetic head is retracted. Further, the shock-resistant magnetic disk device according to claim 4, wherein the magnetic disk, a spindle mechanism for rotating the magnetic disk, and a head actuator movable unit for moving and positioning the magnetic head along the recording surface of the magnetic disk. The magnetic head moves to a retreat zone when the operation is stopped, and the head actuator movable part is fixed at a predetermined position in the retreat zone. A contact portion is provided at a position of the head actuator movable portion facing the magnetic disk side surface, and when the magnetic head moves to the retraction zone, the magnetic disk fixing means and the contact portion are The magnetic disk is fixed by the contact. Since the outer peripheral side surface of the disk is brought into contact with the disk, it can be securely fixed with a small force.
According to a fifth aspect of the present invention, there is provided a shock-resistant magnetic disk device according to the first, second, third or fourth aspect, wherein the pad of the magnetic disk fixing means is provided between the stacked magnetic disks. And is fitted with the magnetic disk. For this reason, the out-of-plane vibration of the magnetic disk is restrained without a large amplitude due to the buffering action of the fixing means in both the magnetic disk device as a whole and in the vertical direction, so that the magnetic disk and the spindle bearing may be damaged. Escape. The magnetic disk drive according to claim 6, further comprising: a magnetic disk; a spindle mechanism configured to rotate the magnetic disk; and a head actuator movable unit configured to move and position the magnetic head along a recording surface of the magnetic disk. A magnetic disk drive comprising a base having the spindle mechanism and the head actuator movable portion, wherein the magnetic head moves to a retreat zone when operation is stopped, wherein a constraint band is formed in a gap between the magnetic disk side surface and the base side wall. One side of the restraint band and the side of the magnetic disk are arranged to face each other,
A short axis at one end of the restraining band is fixed to the base via a member, and a short axis at the other end of the restraining band is fixed at a predetermined position of the head actuator movable section. When the magnetic head moves to the evacuation zone, the constraint band comes into contact with at least a part of the side surface of the magnetic disk. According to this configuration, since the fixing is performed by surface contact, the reliability of preventing damage due to shock resistance is improved. According to a seventh aspect of the present invention, in the shock-resistant magnetic disk device according to the sixth aspect, the constraint band has a friction coefficient of 0.1 or more on a surface facing the side surface of the magnetic disk. There is a feature. Therefore, fixation of the disk side by the restraint band,
It can be more reliable. According to an eighth aspect of the present invention, in the high impact magnetic disk drive according to the sixth aspect, a material of a contact surface of the restraining band with the magnetic disk is a plastic resin. And Therefore, it is possible to improve the effect of damping the shock vibration. According to a ninth aspect of the present invention, there is provided a shock-resistant magnetic disk drive according to the first, second, third, fourth, or sixth aspect, wherein the magnetic disk fixing means comprises a stopper, a contact portion, or a restraining band. It is characterized in that at least one or more of the fixing means is provided. Therefore, damage due to impact from various directions can be prevented, and a highly reliable magnetic disk drive can be realized.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a magnetic disk drive to which the first embodiment of the present invention is applied in a state where operation is stopped. In FIG. 1, a magnetic disk 2 is mounted on a spindle mechanism 1, and a magnetic head (not shown) for recording / reproducing data via a suspension arm 6 is disposed at one end of a head actuator movable unit 5. At the other end, a coil 8 and a bobbin 7 for fixing the coil were arranged. The load / unload member 12 is arranged on the base 10 so that the tip of the suspension arm 6 is located at the position of the load / unload ramp 11, and the magnet 13 fixing the head actuator movable section 5 is arranged on the base 10. The metal plate 14 was arranged on the side surface of the bobbin 7. A projection (stopper) 15 is arranged on the bobbin 7 at a position facing the side surface of the magnetic disk 2. When the magnetic head reaches a predetermined position on the load / unload ramp 11, the metal plate 14 and the protrusion (stopper) 15
3 and the side surface of the magnetic disk 2.

FIG. 2 is a perspective view of the protrusion (stopper) 15, and FIG. 3 is a cross-sectional view when the protrusion (stopper) 15 is in contact with the side surface of the magnetic disk. The protrusion (stopper) 15 includes a pad 15a made of plastic and a pad arm 15b. A notch groove corresponding to the thickness of the magnetic disk 2 was formed on the surface of the pad 15a facing the side surface of the magnetic disk 2. With such a configuration, the side surface of the magnetic disk 2 is fitted to the pad 15a by the force (magnetic force) by which the head actuator movable portion 5 is fixed, so that the magnetic disk 2 is greatly deformed in the out-of-plane direction by impact. And the impact resistance is improved. Further, as shown in FIG. 4, during operation, the pad 15a is detached from the side surface of the magnetic disk 2, so that the rotation of the spindle mechanism 1 does not hinder at all.

FIG. 5 shows a configuration similar to that of the first embodiment, in which the pad shape facing the side surface of the magnetic disk 2 is a wedge shape 15c, and the projection (stopper) 15 is composed of a pad 15c and a pad arm 15d. FIG. 6 shows a cross-sectional view of the second embodiment when the above-described operation is performed. With such a configuration, compared to the pad shape used in the first embodiment, there is no need to position the fitted pad portion and the magnetic disk side portions,
There is an advantage that the assemblability is simplified. Further, there is no need to increase the force for fixing the magnetic disk, which is advantageous for power consumption.

FIG. 6 is a plan view of a magnetic disk drive according to a third embodiment using magnetic disk fixing means, and FIG.
FIG. 8 is an enlarged perspective view of the magnetic disk fixing means, and FIG. Note that components that are the same as or equivalent to those of the above-described first embodiment are given the same reference numerals, and detailed descriptions thereof are omitted. In FIG. 8, a spring 17 is inserted into a cylindrical pressing rod 16, and a pad 15e is provided at one end of the pressing rod 16. The pressing rod 16 is sandwiched between the guides 18a and 18b having a larger circle than the diameter of the pressing rod 16, and the guide 18a and the guide 18b are bonded.
The configuration was as shown in FIG. Further, the mounting surfaces 19a and 19b of the guides 18a and 18b are mounted on the base 10 with screws.

Referring now to FIG. 6, when the tip of the suspension arm 6 reaches a predetermined position on the load / unload ramp 11, the head actuator movable section 5 is fixed to the magnet 13 and the pressing rod The magnetic disk fixing means was arranged such that the pad 15e attached to the magnetic disk 16 was in contact with the side surface of the magnetic disk 2. Pad 1
5e and the pressing rod 16 were installed such that the direction of expansion and contraction was in the center of the spindle mechanism 1. With such a configuration, as shown in FIG. 6, when the operation is stopped, the contact portion 20 attached to the bobbin 7 comes into contact with one end of the pressing rod 16 and pushes the spring 17, so that the pad 15e becomes magnetic. It comes into contact with the side surface of the disk 2.

On the other hand, as shown in FIG.
The contact part 20 attached to the bobbin 7 is
Since the pressing rod 16 and the pad 15 e are not in contact with the other end of the magnetic disk 6, the pressing rod 16 and the pad 15 e are separated from the magnetic disk 2 side surface by the elastic force of the spring 17. As a result, the magnetic disk fixing means does not restrain the rotational movement of the magnetic disk spindle. With such a configuration, it is possible to provide a magnetic disk having high impact resistance performance when operation is stopped. In operation, since the pad that comes into contact with the side surface of the magnetic disk is separated, the first pad connected to the coil side is disconnected.
And the weight is smaller than that of the magnetic disk device configured in the second embodiment. As a result, it is possible to shorten the access time, prevent errors during recording and reproduction due to disturbance vibration, and have excellent positioning accuracy. Further, the pad shape can be made not only the shape shown in the first and second embodiments but also an optimum shape, and there is an advantage that the degree of freedom in design is increased.

FIG. 10 is a plan view of a magnetic disk drive according to a fourth embodiment of the present invention. In the fourth embodiment, a specific example will be described in which the present invention is applied to a 2.5-inch magnetic disk device. FIG. 11 is a perspective view of a restraining band of the magnetic disk fixing means used in the fourth embodiment. The magnetic disk device of this example has a length of 170 mm and a width of 8 mm.
This is an example using fixing means for a plastic restraining band having a thickness of 0.1 mm and a thickness of 0.1 mm. One end is fixed to the pin 22 and the other end is connected to the bobbin 7 via the connection plate 23. A guide 25 and a guide 25a are provided in parallel with the side surface of the base 10. A guide roller 24 is provided near the load / unload member 12 and
a is provided at the corner of the magnetic disk device near the guide 25 and the guide 25a.

Through the guide 25 and the guide 25a,
One surface 21a of the restraining band 21 is opposed to the side surface of the magnetic disk 2, and the latch pin 22 connected to the other end of the short axis of the restraining band 21 is fixed on the base 10 on the outer peripheral side of the magnetic disk 2. . At this time, the tip of the suspension arm 6 is on the load / unload ramp 11 and the metal plate 14 attached to the head actuator movable section 5
Is in contact with the magnet 13,
The position of the latch pin 22 is set so that a is in close contact with the side surface of the magnetic disk 2 and has a predetermined tension.

FIG. 12 is an explanatory diagram showing the principle of operation.
When tension (indicated by a thick arrow in FIG. 12) is generated, the side surface of the magnetic disk 2 and the restraining band 21 are in contact with each other (in FIG. 12, the contact area is indicated by a thin arrow) and held. Become. As a result, the side of the magnetic disk 2 and the restraint band 21
Has an effect of dissipating an external force due to an impact due to the damping action of the restraint band 21 in the portion where the contact is made. In addition, by changing the mounting position of the hook pin 22, the contact area between the one surface 21a of the restraining band 22 and the side surface of the magnetic disk 2 can be increased, and the damping action is exerted against a larger shock vibration. Become.

Thus, even if an impact is applied when the operation is stopped, the magnetic disk and the spindle shaft are fixed by the tension of the restraint band, and the impact vibration due to the impact can be suppressed. Further, during operation, in the state of FIG. 13, that is, in a state where the magnetic head is on the load / unload ramp 11, the magnetic head is moved from the operation stop position (see FIG. 10) to the inner peripheral side of the magnetic disk 2. By activating the spindle mechanism 1 when it moves, the restraint band 21 can have a margin, so that no tension is generated. As a result, the rotation of the spindle mechanism 1 becomes a smooth rotational movement. Further, as shown in FIG. 14, the magnetic head may be loaded on the surface of the magnetic disk 2 after the predetermined number of rotations is reached. This embodiment can be realized by a simple assembly operation,
It has features that can be applied to small and lightweight magnetic disk drives.

A material having a friction coefficient of 0.1 or more, for example, a resin such as polyimide, polyetherimide, nylon, butadiene acrylate, or silicone rubber is coated on the surface of the restraint band facing the magnetic disk side surface. If the structure is at least one layer by a method or bonding, the kinetic energy due to the impact is converted into thermal energy due to friction, so the effect of damping the shock vibration increases, and the magnetic disk drive has the ability to withstand high shock. Can be provided.

Next, a fifth embodiment in which any of the first to third embodiments is combined with the fourth embodiment will be described with reference to FIG. In the fifth embodiment of FIG. 15, the fourth embodiment is configured by combining the first embodiment with the fourth embodiment. Note that components that are the same as or equivalent to those of the above-described embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. With the configuration shown in FIG. 15,
It is possible to provide a magnetic disk drive having high impact resistance against impacts input from various directions. Actually, even when the magnetic disk device of the present invention was dropped from a desk (height: 75 cm) when the operation was stopped, no damage or trouble occurred in the magnetic disk device.

[0023]

According to the present invention, since the displacement of the magnetic disk due to the lateral impact and the damage of the spindle bearing can be avoided, the magnetic disk drive with improved shock resistance and high reliability can be realized.

[Brief description of the drawings]

FIG. 1 is a plan view showing a magnetic disk drive according to a first embodiment of the present invention when operation is stopped.

FIG. 2 is a perspective view showing a protrusion (stopper) according to the first embodiment of the present invention.

FIG. 3 is a cross-sectional view illustrating a protrusion (stopper) that contacts a side surface of the magnetic disk according to the first embodiment of the present invention.

FIG. 4 is a plan view of the magnetic disk drive during operation of the first embodiment of the present invention.

FIG. 5 is a cross-sectional view of a protrusion (stopper) that contacts a side surface of a magnetic disk according to a second embodiment of the present invention.

FIG. 6 is a plan view showing a magnetic disk drive according to a third embodiment of the present invention when operation is stopped.

FIG. 7 is a perspective view of a magnetic disk fixing means according to a third embodiment of the present invention.

FIG. 8 is an assembled perspective view of a magnetic disk fixing unit according to a third embodiment of the present invention.

FIG. 9 is a plan view of a magnetic disk drive during operation of a third embodiment of the present invention.

FIG. 10 is a perspective view of a restraint band according to a fourth embodiment of the present invention.

FIG. 11 is a plan view illustrating a magnetic disk drive according to a fourth embodiment of the present invention when operation is stopped.

FIG. 12 is a plan view illustrating an operation principle of a restraint band according to a fourth embodiment of the present invention.

FIG. 13 is a plan view of a magnetic disk drive at the start of spindle rotation according to a fourth embodiment of the present invention.

FIG. 14 is a plan view of a magnetic disk drive during operation of a fourth embodiment of the present invention.

FIG. 15 is a plan view illustrating a magnetic disk drive according to a fifth embodiment of the present invention when operation is stopped.

FIG. 16 is a perspective view of a conventional magnetic disk drive.

FIG. 17 is a plan view of a magnetic disk drive using a conventional load / unload method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Spindle mechanism 2 Magnetic disk 3 Magnetic head 4 Pivot shaft 5 Head actuator movable part 6 Suspension arm 7 Bobbin 8 Coil 9 Voice coil motor 10 Base 11 Load / unload ramp 12 Load / unload mechanism 13 Fixed magnet 14 Metal plate 15 Projection Portion (Stopper) 15a Pad 15b Pad arm 15c Pad 15d Pad arm 15e Pad 16 Push rod 17 Spring 18a Guide (right) 18b Guide (left) 19a Guide mounting surface (right) 19b Guide mounting surface (left) 20 Contact portion 21 Restriction bands 21a, 21b Restriction band surface 22 Latch pin 23 Connection plate 24 Guide roller 24a Guide roller 25, 25a Guide

Claims (9)

[Claims] 1. A magnetic disk, comprising: a spindle mechanism for rotating the magnetic disk; and a head actuator movable section for moving and positioning the magnetic head along a recording surface of the magnetic disk. A magnetic disk drive in which the magnetic head moves to a retreat zone, comprising: a fixing means for fixing the magnetic disk when the magnetic head moves to a retreat zone. 2. A magnetic disk comprising: a magnetic disk; a spindle mechanism for rotating the magnetic disk; and a head actuator movable portion for moving and positioning the magnetic head along a recording surface of the magnetic disk. In the magnetic disk drive in which the magnetic disk is moved to the evacuation zone, fixing means for fixing the magnetic disk is arranged on the outer peripheral edge of the magnetic disk, and when the magnetic head moves to the evacuation zone, the fixing means An impact-resistant magnetic disk device, wherein the magnetic disk is fixed. 3. A magnetic disk comprising: a magnetic disk; a spindle mechanism for rotating the magnetic disk; and a head actuator movable part for moving and positioning the magnetic head along a recording surface of the magnetic disk, wherein the magnetic head is operated when operation is stopped. Moves to a retreat zone, and at a predetermined position in the retreat zone, the head actuator movable part is fixed. At least a part of the head actuator movable part is provided with a stopper, and the magnetic head is The impact-resistant magnetic disk device according to claim 1, wherein the stopper comes into contact with a side surface of the magnetic disk when the magnetic disk device moves to a retreat zone. 4. A magnetic disk, comprising: a spindle mechanism for rotating the magnetic disk; and a head actuator movable section for moving and positioning the magnetic head along a recording surface of the magnetic disk, wherein the magnetic head is operated when operation is stopped. Is moved to a retreat zone, and at a predetermined position in the retreat zone, the head actuator movable part is fixed. A magnetic disk fixing means is provided on an outer peripheral edge of the magnetic disk. A contact portion is provided at a position facing the magnetic disk side surface, and when the magnetic head moves to the retreat zone, the magnetic disk fixing means and the contact portion come into contact with each other, whereby the magnetic disk is An impact-resistant magnetic disk drive fixed. 5. The shock-resistant magnetic disk device according to claim 1, wherein the pad of the magnetic disk fixing means fits with the magnetic disk in a space between the stacked magnetic disks. A shock-resistant magnetic disk drive characterized by the above-mentioned. 6. A magnetic disk, a spindle mechanism for rotating the magnetic disk, a head actuator movable section for moving and positioning a magnetic head along a recording surface of the magnetic disk, the spindle mechanism and the head actuator movable. And a base having a portion, wherein the magnetic head moves to a retreat zone when operation is stopped, wherein a restraint band is provided in a gap between the magnetic disk side surface and the base side wall, and one side of the restraint band and the The side surface of the magnetic disk is disposed to face, and the short axis of one end of the restraining band is fixed to the base via a member, and the short axis of the other end of the restraining band is a predetermined short axis of the head actuator movable portion. Position, and when the magnetic head moves to the evacuation zone when the operation is stopped, Impact magnetic disk apparatus characterized by contacting at least a portion of the disk side. 7. The shock-resistant magnetic disk device according to claim 6, wherein the restraining band has a coefficient of friction of 0.1 or more on a surface facing a side surface of the magnetic disk. Disk device. 8. The shock-resistant magnetic disk drive according to claim 6, wherein the material of the contact surface of the restraining band with the magnetic disk is:
A shock-resistant magnetic disk drive characterized by being a plastic resin. 9. The shock-resistant magnetic disk drive according to claim 1, wherein the magnetic disk fixing means is at least one of a stopper, a contact part, a restraining band, and the like. A shock-resistant magnetic disk drive comprising the above means.