JP2002109842A - Ramp load type magnetic disk unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve reliability of a ramp load type magnetic disk unit by preventing generation of a scratch on a recording and reproducing region of a magnetic disk even though a shock is exerted onto the unit. SOLUTION: A magnetic head 4 conducts a recording and a reproducing of information to and from a magnetic disk 3. The head 4 is mounted on a suspension to which a tab 15 is integrally formed. When the head 4 moves to a ramp 7 side by the suspension, the tab 15 slides from a load/unload incline 18 to a tip section flat surface 19 and is unloaded. A protrusion 20 is provided on a surface 17 facing the disk 3, of the ramp 7 and at an outer peripheral side of a recording and reproducing region R of the disk 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a load / unload type magnetic disk drive, and more particularly to a ramp load type magnetic disk drive.

[0002]

2. Description of the Related Art As a method relating to handling of a magnetic head when a magnetic disk device starts or stops, there is a CSS (Contact Start Stop) method as a typical one. In this method, when the device is stopped, the magnetic head stops contacting the surface of the magnetic disk, and when the magnetic disk starts rotating at the time of startup, the magnetic head slides on the surface of the magnetic disk and rotates. When the air speed rises above a certain level and the air floats, a steady operation state is set. At the time of stop, as the rotation speed of the magnetic disk decreases,
After sliding on the surface of the magnetic disk, the contact stops on the surface of the magnetic disk.

In this CSS system, a process (texture process) for giving slight irregularities to the surface of the magnetic disk is performed in order to avoid adhesion between the magnetic head and the magnetic disk, both of which have a smooth surface. However, in recent years, it has been necessary to reduce the flying height of the magnetic head with the increase in the recording density to improve the recording density, and for that purpose, it has been necessary to make the surface of the magnetic disk smoother. Are becoming unacceptable.

Therefore, a magnetic disk having a so-called load / unload mechanism that does not stop when the magnetic head is in contact with the magnetic disk has been developed.
This is because the magnetic head is retracted from the surface of the magnetic disk while the device is stopped, and when the magnetic disk reaches the normal rotation speed, the magnetic head is loaded from the retracted position onto the surface of the magnetic disk. This is a method in which the magnetic head is unloaded to a retreat place before the rotation speed of the magnetic disk is reduced.

According to this method, since the magnetic head does not stop while being in contact with the surface of the magnetic disk, there is no need to provide irregularities on the surface of the magnetic disk, and the flying height can be reduced and the recording density can be increased. This is advantageous. Among the load / unload methods, the one with the simplest structure and the highest possibility is the ramp load method. In this method, a member called a running path (hereinafter, referred to as a ramp) having an inclined portion near the outermost or innermost periphery of the magnetic disk is provided, and at the time of loading / unloading, one member of a suspension supporting the magnetic head is provided. The unit runs on a ramp and goes up and down to load / unload the magnetic head.

FIGS. 2 and 3 show a conventional ramp-load type magnetic disk drive. FIG. 2 is a plan view, and FIG. 3 is an enlarged side view of a main part. In FIG. 2, reference numeral 2 denotes a case, 3 denotes a magnetic disk serving as a magnetic recording medium rotated by a spindle motor (not shown), 4 denotes a magnetic head for recording or reproducing on or from the magnetic disk 3, and 5 denotes the magnetic head. 4 is a carriage assembly as a head support member that movably supports the magnetic disk 4 with respect to the magnetic disk 3. Reference numeral 6 denotes a voice coil motor for rotating and positioning the carriage assembly 5. Reference numeral 7 denotes a voice coil motor fixed to the case 2. When the magnetic head 4 moves to the outermost periphery of the magnetic disk 3, the magnetic head 4 is separated from the magnetic disk 3. The holding lamp 8 is a substrate unit.

The magnetic disk 3 has a magnetic recording layer 3a on the upper surface.
Which is clamped by a clamp spring 10 and is rotationally driven at a predetermined speed by a spindle motor. The carriage assembly 5 is rotatably supported by the case 2 about a pivot 12 as a rotation center.
And an elastically deformable elongated plate-shaped suspension 14 attached to the distal end of the suspension 3. The magnetic head 4 is attached to the tip of the suspension 14, and a tab 15 is integrally formed.

As shown in FIG. 3, the lower surface of the ramp 7 has a magnetic disk facing surface 17 formed thereon, and the upper surface of the ramp 7 has a load / unload slope 18 formed on the center side of the magnetic disk 3 and this load. And a top plane 19 connected to the / unloading slope 18. Magnetic disk 3
On the center side of the magnetic recording layer 3a, a recording / reproducing area R in which recording or reproduction can be performed by the magnetic head 4 is provided, and the outer peripheral direction of the recording / reproducing area R, that is, the direction of arrow A in FIG. It has become.

In such a configuration, the magnetic disk 3
Immediately before the rotation of the lamp stops, the voice coil motor 6 is driven in FIG. 2 and the carriage assembly 5 rotates clockwise about the pivot 12 in FIG. After ascending while sliding on the load slope 18 and sliding on the top plane 19, it is held by a tab holding part (not shown). Therefore, the magnetic head 4 is unloaded while being separated from the magnetic recording layer 3a of the magnetic disk 3.

On the other hand, when recording or reproducing on the magnetic recording layer 3a of the magnetic disk 3 by the magnetic head 4,
First, the magnetic disk 3 is rotated, then the voice coil motor 6 is driven, and the carriage assembly 5 is pivoted to the pivot 12.
Is rotated counterclockwise in FIG. FIG.
In the middle, the tab 15 slides on the top plane 19 of the suspension 14 and descends while sliding on the load / unload slope 18, so that the magnetic head 4 comes into contact with the magnetic recording layer 3 a of the magnetic disk 3. Since the magnetic disk 3 is rotating in advance, the magnetic head 4 flies above the magnetic recording layer 3a in the air, and recording or reproduction is performed on the magnetic recording layer 3a.

[0011]

In the above-described conventional ramp-load type magnetic disk drive, as shown in FIG. 3, a ramp 7 is provided with a load / unload slope 18 and the load / unload slope 18 is slid. The magnetic head 4 is loaded / unloaded while moving. Therefore, the leading end 18 a of the load / unload slope 18 faces the recording / reproducing area R of the magnetic disk 3. Therefore, if an impact is applied to the device for some reason, the tip 18a
Has come into contact with the magnetic recording layer 3a, and this magnetic recording layer 3a is scratched, so that there is a problem that recording or reproduction becomes impossible. Further, when the tip 18a comes into contact with the magnetic recording layer 3a, there is a problem that the lamp 7 is damaged and loading / unloading cannot be performed.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above-described conventional problems, and has as its object to improve reliability without damaging a recording / reproducing area of a magnetic disk even when an impact is applied to a device. To provide a ramp load type magnetic disk device.

[0013]

In order to achieve this object, the invention according to claim 1 comprises a magnetic head for recording or reproducing information on a magnetic disk, and a magnetic head supporting the magnetic head and connecting the magnetic head to the magnetic disk. In a ramp-load type magnetic disk device comprising a recording / reproducing area and a head support member for moving the recording head out of the recording / reproducing area, and a ramp for engaging the head supporting member and unloading the magnetic head moved to outside the recording / reproducing area, A projection is provided on a surface of the ramp facing the magnetic disk, at a position on the outer peripheral side of the recording / reproducing area of the magnetic disk. Therefore, when an impact is applied to the apparatus, the projection abuts on a portion of the magnetic disk outside the recording / reproducing area, and the lamp does not contact the recording / reproducing area.

According to a second aspect of the present invention, in the first aspect of the present invention, the lamp is formed of plastic, and the projection is formed integrally with the lamp.
Further, the projections are formed in a hemispherical shape. Therefore,
When the projection comes into contact with the magnetic disk, the tip of the ramp and the projection are elastically deformed. When the impact is large, the tip of the projection is plastically deformed.

The invention according to a third aspect is the invention according to the first aspect, wherein a plurality of the protrusions are provided. Therefore, the plurality of protrusions come into contact with the magnetic disk.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an enlarged side view showing a main part of a ramp-load type magnetic disk drive according to the present invention. In the figure, the same or equivalent members described in the prior art shown in FIGS. 2 and 3 described above are denoted by the same reference numerals, and detailed description is omitted as appropriate.

The feature of the present invention resides in that a projection 20 is provided on the surface 17 of the magnetic disk facing the magnetic disk 3 on the outer circumferential direction A side of the recording / reproducing area R of the magnetic disk 3. The lamp 7 is made of plastic, and a projection 20 is formed integrally with the lamp 7, and the projection 20 is formed in a hemispherical shape, and is provided between the tip and the magnetic recording layer 3 a of the magnetic disk 3. A gap δ is provided.

With such a configuration, even if an impact is applied to the apparatus, the projection 20 comes into contact with the magnetic disk 3, so that the tip 18 a of the ramp 7 is moved to the recording / reproducing area R of the magnetic disk 3. Never touch.
Therefore, the recording / reproducing area R of the magnetic disk 3 is not damaged, and recording or reproduction is not impossible, so that the reliability is improved.

The ramp 7 is made of plastic, and the projections 20 are formed integrally with the ramp 7, so that an impact is applied to the apparatus and the projections 20 come into contact with the magnetic disk 3. The lamp 7 and the projection 20 are elastically deformed. Therefore, the impact is absorbed and the lamp 7 is prevented from being damaged, so that the lamp 7 is not damaged and loading / unloading cannot be performed. In this case, when the impact is large, the protrusion 20
Are formed in a hemispherical shape, and the protrusion 20
Are point-contacted, the tip of the projection 20 is plastically deformed, so that the impact is absorbed by the tip of the projection 20. Further, when the projection 20 comes into contact with the magnetic disk 3,
Since the projections 20 do not bite into the magnetic disk 3, malfunction of the ramp 7 can be prevented.

Although only one projection 20 is provided, a plurality of projections may be provided. In this case, since the plurality of protrusions 20 come into contact with the magnetic disk 3 at the same time, wear at the tips of the protrusions 20 is reduced, and the durability is improved. Further, the heights of the plurality of projections 20 may be different.

[0021]

As described above, according to the first aspect of the present invention, even when an impact is applied to the apparatus, the projection comes into contact with the magnetic disk, so that the ramp comes into contact with the recording / reproducing area of the magnetic disk. Nothing. Therefore, the recording / reproducing area of the magnetic disk is not damaged and recording or reproduction is not impossible, so that the reliability is improved.

According to the second aspect of the present invention, when the projection comes into contact with the magnetic disk, the projection does not bite into the magnetic disk surface, so that a malfunction of the lamp can be prevented. In addition, when the projection comes into contact with the magnetic disk, the projection is elastically deformed and the impact is absorbed, and the lamp is prevented from being damaged. Absent.

According to the third aspect of the invention, the durability is improved.

[Brief description of the drawings]

FIG. 1 is an enlarged side view showing a main part of a ramp-load type magnetic disk drive according to the present invention.

FIG. 2 is a plan view of a conventional ramp-load type magnetic disk drive.

FIG. 3 is an enlarged side view showing a main part of a conventional ramp-load type magnetic disk device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 3 ... Magnetic disk, 3a ... Magnetic recording layer, 4 ... Magnetic head, 5 ... Carriage assembly, 7 ... Ramp, 14 ... Suspension, 15 ... Tab, 17 ... Magnetic disk facing surface, 18 ... Load / unload inclination, 20 ... Protrusions.

Claims (3)

[Claims] 1. A magnetic head for recording or reproducing information on a magnetic disk, a head supporting member for supporting the magnetic head and moving the magnetic head out of a recording / reproducing area and a recording / reproducing area of the magnetic disk, and a head supporting member And a ramp for unloading the magnetic head that has moved out of the recording / reproducing area, the ramp-loading type magnetic disk device comprising: A ramp-load type magnetic disk drive characterized in that at least one projection is provided at a position. 2. The ramp-loaded magnetic disk drive according to claim 1, wherein said ramp is formed of plastic, said projection is formed integrally with said ramp, and said projection is formed in a hemispherical shape. Ramp loaded magnetic disk drive. 3. The ramp-loaded magnetic disk drive according to claim 1, wherein a plurality of said protrusions are provided.