JPH11339410A - Magnetic disc device with loading-unloading mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a lift tab and ramp hard to wear and avoid the operation trouble due to wear dust that a suspension has a swing part having a slide sliding with a ramp to enable the attitude change to the suspension, and the attitude of the swing part differs between at loading and unloading. SOLUTION: A ramp 7 is fixed to a base 1a, lift tab 5b at the top end of the suspension 5a moves along a lift tab slide face provided at the ramp 7a as a guide, thereby performing a load-unload operation of a head, a spring 5d supports the lift tab 5b swingable at the top end of the suspension 5a, and the lift tab 5b has a slide 5c slidable at the ramp 7. When the head is loaded on a disc 2a in the arrow direction A, a frictional force with the ramp 7 is exerted on the lift tab 5b which inclines in the arrow direction B to take an attitude 5b', and when unloaded, the lift tab runs onto the lift tab slide face on the ramp 7 in an attitude 5b.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a magnetic disk device having a highly reliable magnetic disk device having a loading mechanism, in which the sliding portion of a ramp and a suspension lift tab hardly wears even if load / unload operations are repeated frequently. is there. The present invention,
In particular, 3.5 inches, 3 inches, 2.5 inches, 1.8 inches,
The present invention is applied to a small magnetic disk device of 1.3 inches, 1 inch and the like.

[0002]

2. Description of the Related Art As a conventional small magnetic disk drive, for example, a magnetic disk drive disclosed in Japanese Patent Application Laid-Open No. 6-96532 is cited. In a conventional magnetic disk device, the stacked information recording disks are driven to rotate at a constant speed by a spindle motor fixed to a base. The head is supported by the carriage via a suspension, and floats with a small gap between the head and the head to record and reproduce information. The high-speed and high-precision positioning of the head is performed by rotating the carriage with a voice coil motor. By providing the carriage with a pivot assembly incorporating a pivot shaft and two rolling bearings in the sleeve and fixing the pivot assembly on the base, the carriage can rotate about the pivot axis. The voice coil motor that drives the carriage includes a drive coil, a permanent magnet, and a yoke. Of these, a drive coil is mounted on the carriage, and the remaining permanent magnets and yokes (these are referred to as "magnet and yoke assemblies") are fixed on a base. Since the drive coil sandwiched between the magnetic circuits receives a magnetic field, the carriage can be driven by energizing the drive coil, and the head can be positioned at a predetermined position on the disk.

In a magnetic disk device, especially in a small magnetic disk device, improvement of recording density and impact resistance is the most important issue. In order to solve this, a magnetic disk device equipped with a load / unload mechanism has been proposed. The mainstream of the load / unload mechanism system is called a ramp load. For example, U.S. Pat.
As disclosed in US Pat. No. 237,472 and US Pat. No. 5,574,604, a lift tab projecting from the suspension tip is driven by a ramp (lift tab sliding surface) fixed to a base as a guide, and a head is mounted on a disk. Is loaded. At the end of the read / write operation, the head is unloaded from the disk and retracted to the ramp. Since the head is retracted from the disk, there is no fear of head sticking. For this reason, it is not necessary to apply the conventional anti-adhesion processing such as texture, and a smooth disk can be used. Therefore, the flying height of the head can be reduced, and the recording density can be improved. Further, since the head is retracted from the disk, the shock resistance during non-operation can be improved.

[0004]

However, in the above-described ramp loading method in the prior art, in each case, the lift tab protruding from the suspension tip is fixed to the suspension. Follow the same sliding locus when unloading. Therefore, the lamp always slides twice at the same place on the lamp in one round trip load / unload cycle, and the number of times of sliding increases. The lift tab and the ramp are worn by receiving a compressive stress due to a pressing load of the lift tab and a shear stress due to a frictional force. Since the direction of the frictional force is opposite during loading and unloading, the shear stress acting on the sliding portion between the lift tab and the ramp alternates between positive and negative, and the sliding system slides in only one direction. In comparison, the stress amplitude is twice as large. As a result, in a magnetic disk drive equipped with a load / unload mechanism based on the conventional ramp load method, the lift tab and the ramp are worn, and the abrasion powder adheres to the disk, slider, head, and the like. In some cases, operation failure occurs. Therefore, the number of loading / unloading operations is limited.

It is an object of the present invention to provide a frequently repeated load
An object of the present invention is to provide a magnetic disk drive having a highly reliable loading / unloading mechanism, in which a lift tab and a ramp are hardly worn even when an unloading operation is performed, and there is no operation trouble due to abrasion powder.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above problems and achieves the object of the present invention by loading the head on the disk and unloading the head from the disk. And a load / unloader which performs a load / unload operation by sliding a part of the suspension with the ramp.
A swing mechanism provided with a sliding section that slides on the ramp, wherein the swing section is capable of changing its attitude with respect to the suspension; The mechanism configuration is such that the swinging part posture is different at the time of loading and at the time of unloading.

Further, according to the present invention, a swing restraint plate for restraining the attitude of the swing portion is provided on the suspension, and when the sliding portion slides on the ramp during loading or unloading. A frictional force acts on the sliding portion and the swinging portion is pressed against the swinging restraint plate, so that the swinging portion has a different posture during loading and unloading.

Further, in the present invention, the swing mechanism is constituted by a flat plate or a parallel link, and the sliding portion is swingably supported by the suspension.

In the present invention, the angle formed by the center line of the oscillating portion and the center line of the suspension is different from 0 to 20 degrees between when loading and unloading.

Further, the present invention has a mechanism configuration in which a displacement amount of a sliding locus on the ramp at the time of loading and at the time of unloading is 10% or less of the length of the swing portion.

According to the present invention, the swing restraining plate is formed by bending a part of the suspension.

In the present invention, a sliding portion is formed by embedding a steel ball in the swinging portion.

Further, the present invention has a structure in which a viscoelastic sheet is attached to the surface of the spring portion, or a structure in which a part of the swinging portion is filled with a viscoelastic member.

[0014]

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

FIG. 1 is an overall configuration diagram of an embodiment of a magnetic disk drive provided with a loading / unloading mechanism according to the present invention, including a partially enlarged view of a sliding portion swinging mechanism. . 3 shows a state in which a part of the cover-1b of the magnetic disk drive 1 is partially broken. The disk 2a is driven to rotate by a spindle motor 2b fixed to the base 1a. A head (not shown) for recording and reproducing information is provided on a slider 6, and the slider 6 is supported by a suspension 5a. The suspension 5a is supported by the carriage 4a. By holding a pivot assembly 4c containing two rolling bearings (not shown) between the pivot shaft 4b and a sleeve (not shown) on the carriage 4a, and fixing the pivot shaft 4b to the base 1a. The carriage 4a is supported rotatably around the pivot shaft 4b.
Magnet and yoke assembly 3 including a yoke and a permanent magnet
a, and the carriage 4a is rotationally driven by a voice coil motor constituted by a drive coil 3b provided on the carriage 4a, the head is positioned on a predetermined track of the disk 2a, and information is recorded and reproduced.

The magnetic disk drive of the present invention has a load / unload mechanism, and loads a head onto the disk when recording or reproducing information. During sleep and stop, the head is unloaded from the disk 2a and retracted to the ramp 7. FIG. 1 shows a state where the head is retracted from the disk 2a. The lamp 7 is fixed to the base 1a by screws or the like. The lift tab 5b provided at the tip of the suspension 5a moves using the lift tab sliding surface provided on the ramp 7 as a guide, thereby lowering the head load.
Performs a de-unload operation. A swingable lift tab 5b is supported at the tip of the suspension 5a by a spring portion 5d. The lift tab 5b has a sliding portion 5c with the ramp 7. When the head is loaded onto the disk 2a in the direction of arrow A, a frictional force with the ramp acts on the lift tab 5b, and the lift tab 5b tilts in the direction of arrow B and assumes a posture of 5b '. Lift tab 5b is ramp 7
Away from the lift tab 5b, due to the spring restoring force,
Return to the original posture 5b. When the head is unloaded from the disk 2a in the direction opposite to arrow A, the lift tab is 5b.
The rider rides on the lift tab sliding surface 7a provided on the ramp 7 in the posture described above.

The structure of the lift tab and its sliding mechanism will be described with reference to FIGS. FIG. 2 is a plan view of the distal end (lift tab mounting end side) of the suspension 5a in FIG. 1, and FIG. 3 is a side view thereof. The swingable lift tab 5 b has a sliding portion 5 c for sliding with the ramp 7. The sliding portion 5c is formed, for example, by sheet metal pressing on a stainless steel material so as to form a spherical shape.
Since the lift tab 5b and the suspension 5a are connected by welding or the like via the spring portion 5d, when a frictional force with the ramp 7 acts on the sliding portion 5c, the posture of the lift tab 5b changes.

Next, a ramp serving as a guide for the lift tab will be described with reference to FIGS. 4 and 5. FIG. FIG. 4 is a plan view of the lamp 7, and FIG. 5 is a side view thereof. Lamp 7
Have lift-tab sliding surfaces 7a and 7a 'which serve as guide surfaces for loading and unloading. The lift-tab sliding surface 7a on the upper surface side of the ramp 7 and the lift-tab sliding surface 7a' on the lower surface side of the ramp 7 Become. The lift tab sliding surface 7a is used when loading and unloading the upper surface of the disk, and the lift tab sliding surface 7a 'is used when loading and unloading the lower surface of the disk. These lift tab sliding surfaces 7a and 7a 'are formed in a smooth curved surface including a flat surface. The lamp 7 is fixed to the base using screws or the like. Although the present embodiment is a magnetic disk drive having one disk, the present invention is also applicable to a magnetic disk drive having a plurality of disks. In a magnetic disk drive having a plurality of disks, a structure may be adopted in which the number of sliding surfaces of the lift tabs is simply increased according to the number of disks.

The movement and posture of the lift tab during loading and unloading will be described with reference to FIGS. FIG. 6 is a diagram showing a suspension moving direction at the time of loading and FIG. 7 is a diagram showing a direction of a frictional force acting on the lift tab at the time of unloading. In FIG. 6, when the suspension moves in the direction of the left arrow at the time of loading, the lift tab 5b 'slides on the ramp (not shown), so that the frictional force F acts on the sliding point 5h in the direction of the right arrow. I do. As a result, the lift tab 5b 'supported by the spring portion 5d tilts to the right, stops on the swinging portion restraining plate 5e provided on the suspension 5a, and slides on the ramp while maintaining its posture. Similarly, in FIG. 7, when the suspension moves in the direction of the right arrow at the time of unloading, the lift tab 5b slides on a ramp (not shown). The frictional force F acts in the direction of the opposite left-pointing arrow. The lift tab strikes the swinging part restraining plate 5f provided on the suspension 5a with the posture almost upright as shown in 5b, slides on the ramp while maintaining the posture, and stops at the home position. Note that the swinging part restraint plates 5e and 5f can be configured by bending a part of the suspension 5a.

A second embodiment of the magnetic disk drive according to the present invention will be described with reference to FIGS. FIG.
0 is a plan view of the tip of the suspension (a lift tab mounting end side), and FIG. 11 is a side view thereof.

The swingable lift tab 8b is formed into a frame structure using a stainless steel material, and the support portion is connected to the suspension 8a by welding. The lift tab 8b has a sliding portion 8c for sliding with the ramp 7. Therefore, when a frictional force acts on the sliding portion 8c, the posture of the lift tab 8b changes. When stopped and unlocked
At the time of loading, it is represented by a lift tab 8b. At the time of loading, the posture is represented by a lift tab 8b 'shown by a broken line. Although the lift tab 8b is formed into a frame structure using a stainless steel material, it may be configured to form a link mechanism and have a sliding portion at the most advanced link.

The sliding portion 8c is formed by, for example, sheet metal pressing to form a spherical shape. The sliding portion may be formed by embedding another component in the lift tab.

FIG. 12 is a sectional view showing a third embodiment of the lift tab swing mechanism of the magnetic disk drive according to the present invention. Press the steel balls into the lift tabs 5b or fix them with adhesive or the like.
A sliding surface with the lamp 7 is formed.

The lift tab 5b vibrates when sliding on the ramp 7. A method for reducing vibration and stabilizing the operation will be described with reference to FIG. FIG. 13 is a plan view showing a fourth example of the lift tab swing mechanism of the magnetic disk drive of the present invention. 2 are the same as those in FIG. Spring portion 5 for connecting lift tab 5b and suspension 5a
d flexes during the movement of the lift tab 5b, so that the spring portion 5d
By attaching a viscoelastic sheet 5l to one or both sides of the surface of the device, vibrations caused by sliding of the lift tab and the lamp can be reduced, and the operation can be stabilized.

The manner in which the sliding trajectory on the ramp deviates due to the change in the posture of the lift tab during loading / unloading will be described with reference to FIG. FIG. 8 shows the posture of the lift tab at the time of loading / unloading and the radius of rotation to the sliding point. During loading, the lift tab is tilted to the right and 5b '
When the vehicle is unloaded, the posture is substantially upright 5b. As a result, in the direction of the extension connecting the pivot shaft and the sliding point 5h, the position of the sliding point 5h is determined when loading and unloading.
At the time of shift. Therefore, the radius of rotation from the pivot shaft to the sliding point 5h is R when loading, and R + δ when unloading. The shift amount of the sliding locus due to the change in the posture of the lift tab is, for example, approximately as follows. Assuming that the radius of rotation up to the sliding point 5h with the spring portion 5d as a fulcrum is r, and the angle of change in the attitude of the lift tab 5b is θ, the deviation δ of the sliding trajectory due to the change in the attitude of the lift tab 5b is δ = r (1 −cosθ). Assuming that r = 1 mm and θ = 20 degrees, δ = 0.06 mm
Becomes Therefore, the sliding trajectory on the ramp is shifted between when loading and when unloading. In the above example, the displacement of the sliding trajectory on the ramp during loading and unloading is about 5% of the length of the swinging portion, but is less than about 10%. A simple mechanism configuration is sufficient.

FIG. 9 is a diagram showing the sliding locus of the lift tab on the ramp. In the loading operation, the sliding point of the lift tab starts from the lift tab home position 7b on the ramp 7 and follows the sliding locus indicated by 7c, and the head is loaded on the disk. In the unload operation,
The sliding point of the lift tab follows the sliding locus shown in 7d,
The head is unloaded from the disc and lift tab
Return to position 7b. As a result, the sliding trajectory on the ramp is shifted by δ during loading and unloading. In the conventional magnetic disk drive, the lift tab always slides in the same place on the ramp twice in one reciprocating load / unload cycle, whereas in the present invention, the lift tab always slides in only one direction. The number of times of sliding is half that of the conventional case. Since the direction of the frictional force is reversed during loading and unloading, in a conventional magnetic disk drive that slides on the ramp at the same time during loading and unloading, a lift tab and a ramp are used. The shear stress acting on the sliding portion changes alternately between positive and negative. But,
In the present invention, since the slider always slides only in the same direction on the ramp, the stress amplitude is half that of the conventional magnetic disk drive.

It should be noted that, contrary to the present embodiment, the lift tab attitude is substantially upright at the time of loading.
The same effect can be obtained even if the mechanism is configured by reversing the arrangement of the oscillating portion restraining plate so that the mechanism is in a tilted posture during the operation.

[0028]

According to the present invention, the sliding trajectory on the lamp is shifted between when loading and when unloading as described above. In the conventional magnetic disk drive shown in the known example, the slider always slides twice in the same place on the ramp in one reciprocating load / unload cycle, whereas in the present invention, it always slides in only one direction. Since it does not move, the number of times of sliding is half that of the conventional case.

Since the direction of the frictional force is opposite between the time of loading and the time of unloading, in the conventional magnetic disk drive which slides on the ramp at the time of loading and unloading,
The shear stress acting on the sliding portion between the lift tab and the ramp alternates between positive and negative. However, in the present invention, since the slider always slides only in the same direction on the ramp, the stress amplitude is half that of the conventional magnetic disk drive.

As a result, even if the loading / unloading operation is frequently repeated, the lift tab and the ramp are hardly worn out, and a highly reliable magnetic disk drive free from operation trouble due to abrasion powder is provided. Can be.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a magnetic disk drive according to an embodiment of the present invention and a partially enlarged view of a suspension tip portion thereof.

FIG. 2 is a plan view of the tip of the suspension of FIG. 1;

FIG. 3 is a side view of the suspension tip of FIG. 1;

FIG. 4 is a plan view of a lamp according to an embodiment of the present invention.

FIG. 5 is a side view of the lamp of FIG. 4;

FIG. 6 is a diagram illustrating a suspension moving direction and a frictional force acting direction on a lift tab during loading.

FIG. 7 is a diagram illustrating a suspension moving direction and a frictional force acting direction on a lift tab during unloading.

FIG. 8 is a view for explaining a turning radius of a sliding point during loading and unloading.

FIG. 9 is a diagram showing a sliding locus on a ramp during loading and unloading.

FIG. 10 is a plan view showing a tip of a suspension of a magnetic disk drive according to a second embodiment of the present invention.

FIG. 11 is a side view of the suspension tip of FIG. 10;

FIG. 12 is a sectional view showing a tip of a suspension of a magnetic disk drive according to a third embodiment of the present invention.

FIG. 13 is a plan view showing a tip end of a suspension of a magnetic disk drive according to a fourth embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Magnetic disk device, 1a ... Base, 1b ... Cover, 2a ... Disk, 2b ... Spindle motor, 3
a: magnet / yoke assembly, 3b: drive coil, 4
a: carriage, 5a, 8a: suspension, 5
b, 8b: Lift tab posture when stopped and unloaded, 5b ', 8b': Lift tab posture when loaded, 5
c, 8c: sliding portion, 5d: spring portion, 5e, 8e: ro
Oscillating portion restraining plate during loading, 5f, 8f ... Oscillating portion restraining plate during unloading, 5g, 8g ... welding point, 5h, 8h ... sliding point, 5i, 5j ... flange portion, 5k ... steel ball , 5 l
... Viscoelastic sheet, 5m ... Viscoelastic member, 6 ... Slider with head, 7 ... Ramp, 7a, 7a '... Lift tab sliding surface, 7b ... Lift tab home position, 7
c: sliding locus during loading, 7d: sliding locus during unloading, 8i: bent portion forming a sliding portion

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Tomokazu Ishii 2880 Kozu, Kodawara City, Kanagawa Prefecture Inside the Storage Systems Division, Hitachi, Ltd. (72) Shozo Saegusa 2880 Kozu, Kozu, Odawara City, Kanagawa Prefecture Hitachi, Ltd. In the Storage System Division (72) Inventor Tetsuya Hamaguchi 502 Kandachicho, Tsuchiura-shi, Ibaraki Pref.

Claims (3)

[Claims] 1. A disk for recording information, a spindle motor for rotating the disk, a head for recording information on or reproducing information from the disk, and a slider having the head are supported. A suspension, a carriage supporting the suspension, a voice coil motor for applying a rotational torque to the carriage for positioning the head on the disk, and loading the head on the disk or mounting the head on the disk. A magnetic disk drive having a ramp serving as a guide for unloading from the disk, and performing a load / unload operation by sliding a part of the suspension with the ramp. A swinging portion provided with a sliding portion that slides with the A magnetic disk drive, wherein the posture of the swinging portion can be changed when loading and unloading. 2. The suspension according to claim 1, further comprising: a swing restraint plate for restraining a posture of the swing portion, wherein the suspension is loaded or unloaded.
When the sliding portion slides on the ramp at the time of loading, the swinging portion is pressed against the swinging restraint plate so that the attitude of the swinging portion is different between when loading and when unloading. 2. The magnetic disk drive according to claim 1, wherein: 3. A disk for recording information, a spindle motor for driving the disk to rotate, a head for recording information on or reproducing information from the disk, and a slider having the head. A suspension, a carriage supporting the suspension, a voice coil motor for applying a rotational torque to the carriage for positioning the head on the disk, and loading the head on the disk or mounting the head on the disk. A magnetic disk drive having a ramp serving as a guide for unloading from the disk, and performing a load / unload operation by sliding a part of the suspension with the ramp. The sliding position is different between loading and unloading. Magnetic disk drive.