JPH11162139A - Magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the reliability of a magnetic head device by performing excellent cleaning work while the increase of the driving torque of a magnetic disk medium is reduced as much as possible by adjacently arranging cleaning members which come into contact with the surface of the magnetic disk medium when the medium is rotated on at least the upstream side of a magnetic head in the rotating direction of the medium. SOLUTION: Cleaning member 6 which are positioned on both sides of a magnetic head 2 removes dust adhering to the surface of a magnetic disk medium 24 while the cleaning surfaces 6a of the members 6 come into contact with the surface of the medium 24 on the upstream side of the head 2 in the rotating direction of the medium. The contact between the member 6 and the surface of the medium 24 is a very small partial contact. Therefore, the driving loss of the rotational torque of the medium 24 becomes smaller and the medium 24 can be rotated stably and surely at a high speed with a small driving motor.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head device for recording and reproducing data on and from a magnetic disk cartridge or the like in which a disk-shaped magnetic disk medium is accommodated in a case.

[0002]

2. Description of the Related Art A magnetic disk cartridge contains a disk-shaped magnetic disk medium rotatably housed in a case formed by joining upper and lower shells. It is expensive to perform recording and reproduction on the magnetic disk medium by a magnetic head. It is necessary to ensure reliability.

[0003] From the viewpoint of ensuring the reliability, it is important that dust that causes so-called dropout does not adhere to the magnetic disk medium or the magnetic head. The dust is generated inside the magnetic disk cartridge and invades from the outside, but it is difficult to completely prevent the generation and intrusion.

In order to wipe off dust adhering to the magnetic disk medium, a liner made of nonwoven fabric or the like is provided on the inner surface of the case, and the liner is brought into contact with the surface of the magnetic disk medium by a lifter to clean the surface of the magnetic disk medium. Has been done.

[0005]

However, in the magnetic disk cartridge, high-speed rotation is attempted to secure a high data transfer rate in response to the increase in the recording capacity of the magnetic disk medium, and the driving torque of the magnetic disk cartridge is stabilized. There is a tendency for contact with the liner to be reduced in order to ensure the performance and the torque capability of the motor. Along with this, the dust removal effect on the surface of the magnetic disk medium by the liner is reduced, and problems such as the occurrence of dropout due to the accumulation of dust adhering to the magnetic disk medium in the head gap of the magnetic head become remarkable. Needed.

For example, in a large-capacity magnetic disk cartridge system to which the present invention is applied, a recording wavelength is short, and a magnetic disk medium is used for securing a transfer rate.
This is a method that rotates at high speed such as rpm.This reduces the contact load of the cleaning member such as the liner on the rotational torque, and ensures that the surface of the magnetic disk media is cleaned so that dust does not affect the head gap. Therefore, it is necessary to ensure reliability. On the other hand, in this large-capacity magnetic disk cartridge drive device, it is necessary to provide a low-speed rotation drive in order to enable recording / reproduction of a magnetic disk cartridge having a lower recording capacity. It is necessary to cope with low-speed to high-speed rotation and to obtain a certain or more rotational torque. Further, this drive device needs to be compatible with a desktop personal computer to a light and thin notebook type personal computer, and the drive motor is required to be low power and thin, and it is difficult to obtain high rotational torque.

In consideration of the above, as described above, a large-capacity magnetic disk cartridge has a drive torque of the magnetic disk medium as small as possible, that is, an interference action with a component other than the magnetic head when the magnetic disk medium rotates at a high speed. It is required that there be as little as possible.

[0008] That is, dust removal of the magnetic disk medium by the cleaning member is effective in preventing dropout, but the conventional liner and the lifter are in full contact with the magnetic disk medium due to a large loss torque, which is necessary. Motor driving torque becomes large, which is not suitable for high-speed rotation during large-capacity recording / reproduction.

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and provides a magnetic head device in which the increase in drive torque of a magnetic disk medium is reduced as much as possible while obtaining a good cleaning action and improving reliability. It is something you want to do.

[0010]

A magnetic head device according to the present invention, which has solved the above-mentioned problems, includes a magnetic head for recording / reproducing data on / from a disk-shaped magnetic disk medium, and the magnetic head moves with respect to the rotation direction of the magnetic disk medium. A cleaning member that comes into contact with the surface of the magnetic disk medium at the time of rotation of the magnetic disk medium is disposed adjacent to at least the side part on the upstream side.

In the magnetic head device as described above, the cleaning member contacts the surface of the magnetic disk medium locally with the rotation of the magnetic disk medium, and the cleaning member extends radially from the center to the outer periphery of the magnetic disk medium. With the movement of the magnetic head, the cleaning member also moves to clean the minimum necessary surface of the magnetic disk medium where recording and reproduction are performed by the magnetic head.

It is preferable that the cleaning member is provided so as to make a similar movement to and away from the magnetic disk medium when the operation of the magnetic head starts or ends.

Preferably, the cleaning member has a cleaning surface provided at a slight bias angle with respect to the rotational radius direction of the magnetic disk medium.

It is preferable that the cleaning member is supported integrally with the magnetic head or is supported by a suspension member provided separately and separately, and is disposed near the side of the magnetic head.

The cleaning member may be a nonwoven fabric,
It is composed of a long fiber cloth, a brushed body, a fiber brush, and the like, and its tip is set so as to lightly contact the surface of the magnetic disk medium during high-speed rotation. Further, a hard ceramic member having a scraping function, a so-called scraper function, may be used.

[0016]

According to the present invention as described above, the cleaning member is provided at least in the vicinity of the side of the magnetic head on the upstream side in the running direction of the magnetic disk medium so as to follow the operation of the magnetic head. The surface cleaning effect of the magnetic disk medium can be reliably obtained by removing the dust on the surface of the magnetic disk medium at the necessary recording / reproducing track portion, which is caused by dust adhering to the head gap of the magnetic head. Reliability can be improved without causing dropout or the like, and an increase in loss torque due to a contact load with respect to the rotation of the magnetic disk medium can be reduced by making the contact area of the cleaning member partial. Rotational driving can be performed stably.

Further, if the cleaning member is provided so as to move in a similar manner in connection with the movement of the magnetic head to or from the magnetic disk medium at the start or end of the operation of the magnetic head, it corresponds to the operation of the magnetic head. And a good cleaning action can be obtained. In particular, by supporting the cleaning member with a suspension member provided integrally with or separately from the magnetic head, movement following the movement with the magnetic head can be secured, and highly accurate positioning can be performed.

On the other hand, when the cleaning member is provided such that the cleaning surface is provided at a slight bias angle with respect to the rotational radius direction of the magnetic disk medium, an effect of repelling dust adhering to the magnetic disk medium to the outside can be obtained. The dust that has been blown off is carried to the outside by the centrifugal force of the magnetic disk medium and the airflow flowing on the surface of the magnetic disk medium, so that the burden of wiping and removing by the cleaning member is reduced, and the cleaning member is applied to the surface of the magnetic disk medium. Contact can be made lighter,
The drive torque can be further reduced.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings. FIG. 1 is a perspective view schematically showing a driving state of a magnetic disk cartridge by the magnetic head device according to the first embodiment. In the figure, the ratio of the magnetic head to the magnetic disk medium is shown at a different ratio.

The magnetic head device 1 of the present invention sandwiches a disk-shaped magnetic disk medium 24 contained in a magnetic disk cartridge 20 to be described later with a magnetic head 2 mounted on the front end of a suspension member 3 made of a leaf spring on both surfaces thereof. The magnetic disk medium 2
4 is rotated in a fixed rotation direction A, and recording / reproduction is performed by the magnetic head 2 (specifically, head gap portion) in a contact state.

The center portion of the magnetic disk medium 24 is fixed to the flange portion 23a of the center hub 23, and the center hub 23 is rotatably driven by a magnetic disk drive device 10 (see FIG. 3) described later. .

The magnetic head 2 has a base member 4 fixed to the suspension member 3. The base member 4 has a magnetic disk medium 24 (not shown in detail).
A slider 5 having a protruding rail is provided on a surface facing the surface of the slider, and a thin film magnetic head or the like having a head gap for recording and reproduction is fixed to a part of the slider 5.

The slider 5 of the magnetic head 2 is moved by the air flow generated by the rotation of the magnetic disk medium 24 in accordance with the set shape thereof.
The magnetic disk medium 24 comes into contact with or separates from the surface as the magnetic disk medium 24 rotates at a high speed. The contact load of the magnetic head 2 is set to a predetermined value depending on the relationship with the urging force of the suspension member 3 (leaf spring).

The rotational speed of the magnetic disk medium 24 is 3000 to 5000 rpm, for example, 3600 rpm in the case of a 3.5-inch magnetic disk medium 24.

A cleaning member 6 is provided adjacent to both sides of the magnetic head 2. The mounting of the cleaning member 6 is such that the plate-like base member 4 of the magnetic head 2 is extended laterally to provide a mounting portion 4a, and the cleaning member 6 made of a soft material is fixed to the lower surface of the mounting portion 4a. Cleaning surface 6a of cleaning member 6 that contacts magnetic disk medium 24
The height of the (wiping surface) is provided to be equal to the height of the magnetic head 2 (head gap). In the recording / reproducing state where the magnetic disk medium 24 is rotating at a high speed, the tip cleaning surface 6a is It is provided so as to remove dust adhering to the magnetic disk medium 24 by lightly contacting the surface and to prevent the magnetic disk medium 24 from entering the magnetic head 2 side.

The cleaning member 6 is formed by forming the contact surface with a material that does not damage the surface of the magnetic disk medium 24 and does not generate debris that causes dust. It is formed with a fiber cloth, a raised body, a fiber brush, or the like. Further, the whole of the cleaning member 6 may be formed of the above-mentioned material, or the above-mentioned material may be fixed to the surface of a soft material such as plastic or rubber. Further, it is also possible to use a hard ceramic member and install a cleaning member for removing the dust so as to scrape it off.

The magnetic head 2 provided with the same cleaning member 6 as described above is also supported by the suspension member 3 on the opposite surface of the magnetic disk medium 24, and the upper and lower magnetic heads 2 are provided. Thus, the magnetic disk medium 24 is brought into contact with the magnetic disk medium 24 in a sandwiched state, so that the magnetic disk medium 24 is rotated stably.

On the other hand, the magnetic disk medium 24
For example, it is rotatably housed in a magnetic disk cartridge 20 as shown in FIGS.

In the magnetic disk cartridge 20, a flat case C is formed by joining an upper shell 21 and a lower shell 22 made of a resin molded product such as an acrylonitrile-butadiene-styrene copolymer. The magnetic disk medium 24 as a recording medium fixed to the center hub 23 is stored in a rotatable state, and liners 25 are installed above and below the magnetic disk medium 24. The liner 25 and the surface of the magnetic disk medium 24 are always in non-contact.

The case C has a substantially rectangular flat shape, and a rectangular magnetic head insertion opening 26 is opened on the upper and lower surfaces. The liner 25 is provided in a polygonal shape (or a round shape) by a nonwoven fabric or the like, and is adhered to the inner surfaces of the upper and lower shells 21 and 22 by ultrasonic welding, bonding, or the like. A circular hub hole 27 facing the center hub 23 is opened at the center of the lower shell 22. Further, a shutter 28 which is slidable to open and close the magnetic head insertion opening 26 is attached to the case C.

On the other hand, the magnetic disk drive 10 for driving the magnetic disk cartridge 20 as described above holds the magnetic disk cartridge 20 at a predetermined position and chucks the center hub 23 of the magnetic disk medium 24 with the spindle 12. Then, the spindle shaft 12 is driven by a drive motor (not shown) to rotate the magnetic disk medium 24 at a predetermined rotation speed. Further, in conjunction with the insertion operation of the magnetic disk cartridge 20, the shutter 28 is opened, the magnetic head 2 is inserted through the opened magnetic head insertion opening 26 to approach the magnetic disk medium 24, and the magnetic recording / reproducing is performed. I do.

The spindle shaft 12 has a hub chuck 12a at its tip for chucking the center hub 23 by magnetic attraction or the like. The spindle shaft 12 below the hub chuck 12a is rotatably supported by bearings 13. At the same time, it extends through the frame 14 and rotates at a high speed in conjunction with a drive motor (not shown).

In the magnetic recording / reproducing state, the magnetic head device 1 as described above comes into contact with the surface of the magnetic disk medium 24 rotating at a high speed with a predetermined contact load, and moves in the circumferential direction of the magnetic disk medium 24. Data is written to or read from the provided tracks. Then, the magnetic head 2 moves in the radial direction from the central portion to the outer peripheral portion of the normal magnetic disk medium 24, and sequentially records the tracks on the track.

At this time, the cleaning member 6 placed on the side of the magnetic head 2 makes contact with the surface of the magnetic disk medium 24 whose tip end cleaning surface 6a is upstream of the magnetic head 2 in the rotation direction of the magnetic disk medium 24. By performing wiping, dust adhering to the surface of the magnetic disk medium 24 is removed, and the dust is prevented from adhering to the head gap of the magnetic head 2 and causing dropout.

The cleaning member 6 moves the magnetic head 2, that is, moves toward and away from the surface of the magnetic disk medium 24 with the rotation of the magnetic disk medium 24, and moves the magnetic head 2 in the radial direction of the magnetic disk medium 24. The magnetic head 2 moves along with the movement, and always performs the cleaning action at a position forward of the rotation of the magnetic head 2.

The contact with the surface of the magnetic disk medium 24 for this cleaning action is a very small partial contact with the entire magnetic disk medium 24, and the rotational torque of the magnetic disk medium 24 due to the contact is small. The drive loss is small and the magnetic disk medium 24
Can be stably and reliably performed by a small drive motor.

FIG. 4 shows another embodiment of the magnetic head device 1, in which the cleaning member 6 is integrally attached to the magnetic head 2 in the previous example, whereas the suspension of the magnetic head 2 by a leaf spring is used. This is an example in which the cleaning member 6 is attached to the tip of the member 7.

That is, the tip of the suspension member 7 is divided into three forks, the magnetic head 2 is attached to the tip of the central spring 7a, and the cleaning is applied to the tip of the side spring 7b formed to extend thinly on both sides. Member 6 is attached. The cleaning member 6 is provided substantially in the same manner as in the previous example.

Also in this example, the cleaning member 6 is linked to the operation of the magnetic head 2 so that the cleaning member 6
4 moves in the radial direction from the central portion to the outer peripheral portion, and moves toward and away from the surface of the magnetic disk medium 24 as the magnetic disk medium 24 rotates. The cleaning member 6 can be slightly displaced relative to the magnetic head 2 by an amount corresponding to the deformation of the side spring portion 7b of the suspension member 7, and can be minutely changed in accordance with collision with foreign matter, contact resistance with the surface of the magnetic disk medium 24, and the like. Although it is displaced, the cleaning action and the like are basically the same.

FIG. 5 shows still another embodiment. Although the basic structure is not shown, it is the same as FIG. 1 or FIG. 4, and the installation direction of the cleaning member 6 is different.

The cleaning member 6 located on the upstream side of the magnetic head 2 with respect to the rotation direction A of the magnetic disk medium 24 moves along a center line toward the rotation center S of the magnetic disk medium 24 (a direction orthogonal to the rotation direction A). On the other hand, they are inclined so as to face outward with a bias angle θ of several degrees or less, for example, 2 °.

When the cleaning member 6 provided with the bias collides with a foreign substance adhering to the magnetic disk medium 24, the cleaning member 6 flies the foreign substance outward and is generated as the magnetic disk medium 24 rotates. It is carried by the outward air flow and is discharged outside the magnetic disk medium 24. Thereby, the requirement for wiping by the cleaning member 6 is reduced, the contact with the surface of the magnetic disk medium 24 can be reduced, and the torque loss in driving the magnetic disk medium 24 can be further reduced. In this case, the cleaning member 6 may be made of a hard ceramic member.

In the above embodiment, the cleaning member 6 is rotated in the rotation direction A of the magnetic disk medium 24.
Are arranged on both sides of the magnetic head 2 so as to maintain the balance. However, the cleaning member 6 is arranged only on the upstream side of the magnetic head 2 in the rotation direction of the magnetic disk medium 24. You may.

[Brief description of the drawings]

FIG. 1 is a perspective view schematically showing an operation state of a magnetic disk cartridge by a magnetic head device according to a first embodiment of the present invention.

FIG. 2 is an external perspective view of a magnetic disk cartridge.

FIG. 3 is a schematic cross-sectional view showing a rotational drive state of the magnetic disk cartridge of FIG. 2;

FIG. 4 is a perspective view schematically showing a magnetic head device according to a second embodiment.

FIG. 5 is a layout diagram schematically showing a magnetic head device according to a third embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head device 2 Magnetic head 3, 7 Suspension member 4 Base member 4a Attachment part 5 Slider 6 Cleaning member 6a Cleaning surface 10 Magnetic disk drive 12 Spindle shaft 20 Magnetic disk cartridge 23 Center hub 24 Magnetic disk media 25 Liner 26 Magnetic head Insertion port θ Bias angle

Claims (3)

[Claims] 1. Recording / recording on a disk-shaped magnetic disk medium
A magnetic head for performing reproduction; and a cleaning member that contacts the surface of the magnetic disk medium when the magnetic disk medium rotates when the cleaning member is disposed adjacent to at least a side edge of the magnetic head on the upstream side in the rotation direction of the magnetic disk medium. Head device. 2. The apparatus according to claim 1, wherein the cleaning member moves in a similar manner in connection with the movement of the magnetic head to or from the magnetic disk medium at the start or end of the operation of the magnetic head. Magnetic head device. 3. The magnetic head device according to claim 1, wherein the cleaning member has a cleaning surface provided at a slight bias angle with respect to the rotational radius direction of the magnetic disk medium.