JP2000311325A - Magnetic recording / reproducing device using flexible disk - Google Patents

Abstract

(57) Abstract: In a magnetic recording apparatus using a flexible disk in which dynamic fluctuations are easily promoted by high-speed rotation and a stable air layer film is not easily held between slider heads, a local portion between the slider head and the disk is provided. Abstract: A magnetic recording device capable of mitigating a proper and excessive contact state and securing a durable life of a disk is realized. In a magnetic recording / reproducing apparatus, a head (4a),
4b is rotatable about an axis perpendicular to the direction of rotation of the disk, and the surface facing the surface of the disk is configured to have a predetermined radius of curvature in the direction of rotation of the disk. With this, as the disk rotates,
Since the surfaces of the heads 4a and 4b that face the disk in advance move away from the surface of the disk,
Excessive contact of the a and b with the surface of the disk 1 can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording / reproducing data on a magnetic recording flexible disk such as a floppy disk.

[0002]

2. Description of the Related Art At present, a floppy disk drive (hereinafter referred to as FDD) is used as data storage means of a personal computer.
Has been widely used. In particular, in recent years, still images,
The amount of data handling moving images and the like has increased, and super FDDs with a large capacity of 100 MB or more and high speed transfer have appeared.

[0003]

Since the super FDD is rotated at a high speed, the floppy disk, which is an elastic material having a small thickness, has a dynamic out-of-plane direction with an increase in the number of rotations. Fluctuations increase.

[0004] The dynamic fluctuation causes the contact deterioration due to the spacing between the write / read head and the recording medium, and also causes the medium to be damaged due to the unstable contact state of the head with the medium. Such a phenomenon causes data reliability to be significantly reduced.

[0005] Unlike a hard disk of an HDD device, a flexible disk such as the above-mentioned floppy disk is a manufacturing method in which a magnetic film is coated or vapor-deposited on a strip-shaped base film, like a tape medium. The hard disk is deposited as it is on the surface of the highly rigid base disk, and once mounted on the HDD device, there is no need to remove the hard disk, and high rotational accuracy can be secured.

On the other hand, as described above, the floppy disk requires a separate step of attaching and fixing a disk formed into a disk shape and a metal hub. In addition, the user frequently exchanges the disk because it is removable.
For this reason, a problem in the manufacturing method and a problem in operability arise.
In the problem of the manufacturing method, out-of-plane displacement depending on the accuracy of attaching the floppy disk to the hub is promoted by the increase in the number of rotations, and unstable contact impact between the slider head and the floppy disk is likely to occur.

[0007] In such a contact state, the end surface of the write / read head causes a one-sided contact with the surface of the floppy disk, and the surface of the magnetic layer of the disk is liable to be scratched by use for a long time. This phenomenon becomes more remarkable as the rotation speed of the floppy disk increases.

[0008] The super FDD device, when performing recording and reproduction on a 1.4 MB capacity disc of a standard format that has already been standardized, has at least two types of recording and reproduction for a current format and a large capacity format. A magnetic head needs to be mounted on the slider section. For this reason,
The size of the head itself also increases, so that the sensitivity of one-sided contact due to the attitude of the flexible disk and the head is high, and the possibility of occurrence of contact increases.

Therefore, as a countermeasure for suppressing the contact between the end face of the magnetic head and the floppy disk, for example, as described in Japanese Patent No. 2815676, the surface of the floppy disk on which the magnetic head is arranged is connected to the surface of the floppy disk. Has a stabilizer on the opposite side, which comes into contact with the disc, and optimizes the shape and position of this stabilizer,
It is considered that the vibration of the floppy disk is forcibly suppressed by bringing the disk into contact with the rotating disk.

However, the above-mentioned stabilizer is effective for the deformation of the floppy disk in one direction, but it is difficult to effectively suppress the deformation in the opposite direction.

An object of the present invention is to provide a magnetic recording / reproducing apparatus using a flexible disk having a low rigidity of a disk, wherein a high-speed rotation facilitates dynamic fluctuation and a stable air layer film is formed between slider heads. It is an object of the present invention to provide a magnetic recording apparatus using a flexible disk which is difficult to hold, which can alleviate a local and excessive contact state between a slider head and the disk and ensure the durability life of the disk. .

[0012]

In order to achieve the above object, the present invention is configured as follows. (1) At the tip of a suspension made of elastic material and having a predetermined arm length, a slider portion having a plurality of sliding portions and a built-in slider portion are provided for the disk-shaped flexible disk, and the magnetic gap lengths are mutually different. A slider head having at least two different magnetic heads, and a pair of slider head assemblies in which the magnetic gap surfaces of the slider head are opposed to each other in the thickness direction of the flexible disk; In a magnetic recording / reproducing apparatus using a flexible disk for recording / reproducing while pressing, a plurality of magnetic heads of a slider head include a magnetic head having a small gap length and a magnetic head having a large gap length,
The magnetic head having a large gap length is disposed on the slider head ahead of the magnetic head having a small gap length by a predetermined distance in the rotation direction of the flexible disk, and a contact sliding portion of the slider head with the flexible disk is provided. Along the rotation direction of the disk,
A substantially central portion has a plurality of radii of curvature that are convex toward the opposing surface of the disk, and a first region where the magnetic head is disposed, and a rotational direction of the disk from the first region. It has a second area arranged in advance and a third area arranged after the first area in the rotation direction of the disc with respect to the rotation direction of the disc, and the radius of curvature of the first area is It is larger than the radius of curvature of the second and third regions.

(2) Preferably, in the above (1),
The radius of curvature of the first region is infinite.

(3) Preferably, in the above (1) or (2), the contact sliding portions are two contact sliding portions which are parallel to the rotation direction of the disk and have different sliding widths. A magnetic head having a small gap length is arranged in a contact sliding portion having a small sliding width, and a magnetic head having a large gap length is arranged in a contact sliding portion having a large sliding width.

(4) Preferably, the above (1),
In (2) or (3), when the disk rotation speed is low, the recording / reproducing operation is performed using the magnetic head having the large gap length. When the disk rotation speed is high, the magnetic head having the small gap length is used. The recording / reproducing operation is performed using this.

(5) Preferably, the above (1),
In (2), (3) or (4), the contact sliding portion has a radius of curvature such that a substantially central portion of the contact sliding portion is convex toward a facing surface of the disk along a radial direction of the disk.

The sliding portion of the slider head in contact with the flexible disk has a plurality of radii of curvature such that a substantially central portion thereof has a convex shape toward the opposing surface of the disk along the rotation direction of the disk. Therefore, even if the disk is deformed with the rotation of the disk, excessive contact between the end of the contact sliding portion and the surface of the disk is prevented.

That is, it is possible to realize a magnetic recording apparatus capable of relaxing a local and excessive contact state between the slider head and the disk and securing a durable life of the disk.

[0019]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described with reference to FIG. FIG. 1 is a schematic side view of a magnetic recording and reproducing apparatus according to an embodiment of the present invention, FIG. 2 is a schematic plan view of a magnetic recording and reproducing apparatus according to an embodiment, and FIG. 3 is a partially enlarged perspective view of the embodiment. It is.

In FIG. 1, 1 is a disk-shaped flexible recording medium (hereinafter referred to as a disk), 2 is a spindle motor, 2a is a spindle, 3 is a hub, 4a is a slider head (upper surface arrangement), and 4b is a slider head. (Slider head is hereinafter referred to as a head), 5a is a suspension (upper surface arrangement), and 5b is a suspension (lower surface arrangement).

Reference numeral 6 denotes a drive block, 7 denotes a drive coil, 7a denotes an applied voltage line, 8 denotes a chassis, 9 denotes a guide rail, and 10 denotes a magnet.

The disk 1 fixed to the hub 3 fits with the spindle 2a and can rotate integrally with the spindle motor 2. The spindle motor 2 is fixed to the chassis 8. The head 4 (4a, 4b) is fixed to the tip of the suspension 5 (5a, 5b) by a pivot structure (the mechanism is not shown), and the suspension 5 (5a, 5b)
Are fixed to the drive block 6, respectively.

The drive block 6 is engaged with two guide rails 9 and can reciprocate only in the directions A and B (radial direction of the disk 1) as shown in FIG. A drive coil 7 is integrated with the drive block 6, and a pair of magnets 10 are arranged with a row of the coils 7 interposed therebetween. That is, when a predetermined voltage is applied to the applied voltage line 7a, a driving force in the A or B direction is generated in the coil 7 by the coil current and the interlinkage magnetic flux.

The direction of the driving force generated from the coil 7 is
It depends on the direction of the current supplied to the coil 7. The slider heads 4a and 4b are opposed to each other with the disk 1 interposed therebetween, and the elastic force of the suspension 5 acts in a direction in which the disk 1 is pressed. That is, two heads 4
a and 4b are A or B with the disk 1 pressed
Recording and reproduction are performed while sliding in the direction.

Although the recording format is not shown, after a recording track is formed on the circumference of the disk 1, a predetermined current is applied to the coil 7 and the head 4a,
4b, and a system for sequentially performing recording and reproduction. For this head feed, for example, there is a means for feeding back a servo signal recorded in advance on the disk 1 while referring to the servo signal by another head, but detailed description thereof will be omitted.

FIG. 3 is a perspective view showing the attitude operation of the head 4a. In FIG. 3, the head 4a is arranged around the X axis (the radial axis of the disk 1) and the Y axis (an axis which is in the same plane as the plane including the X axis and is orthogonal to the X axis) with respect to the suspension 5a. It is supported so that it can rotate. The head 4a does not rotate in the Z-axis direction (the axis orthogonal to the X-axis and the Y-axis). Thus, the head 4a is configured so that the pressure bonding operation thereof can follow the displacement of the disk 1. The head 4b has the same configuration as the head 4a.

FIG. 4 is a plan view of the heads 4a and 4b viewed from the disk 1 surface side.
FIG. 3 is a diagram illustrating a surface on which recording and reproduction are performed. Heads 4a, 4
b has at least two magnetic gaps, and the head gap length for a low-capacity recording format is p and the head gap length for a high-capacity high density is o. This p
And the gap length of o is characterized in that o is narrower than p. The gap p having a large gap length is a line substantially perpendicular to the rotation direction of the disk 1, and is arranged such that the central portion thereof is located at the center line C of the head 4a. The gap o having a small gap length is deviated by δ from the center line C, and the gap p is arranged ahead of the gap o by δ in the rotation direction of the disk 1.

The gap o is arranged at a contact portion width L1 that comes into contact with the surface of the disk 1, and the gap p
Are arranged at the portion of the contact portion width L2. The contact portion width L1 is larger than the width L2.

The contact portion having the contact portion width L1 and the contact portion having the contact portion width L2 are arranged so as to be parallel to each other and also in the rotation direction of the disk 1. Also, head 4
The disk contact portions a and 4b are formed by the radii of curvature R0 and R1.

FIG. 5 is a perspective view of the head. That is,
The portions of the heads 4a and 4b in the direction of rotation of the disk 1 have a radius of curvature R1 and are in a direction substantially perpendicular to the direction of rotation of the disk 1 (radial direction of the disk 1). The width portion has a radius of curvature R0.

FIGS. 6, 7 and 8 are diagrams for explaining problems under a high-speed rotation condition of a disk in a conventional head shape. FIG. 8 is an explanatory view showing the state of occurrence of surface scratches on the disk surface.
And the edges forming the respective head shapes are denoted by k, l, m, n, q, and r.

As shown in FIG. 6, in the conventional head, the side in contact with the surface of the disk 1 has a flat surface with high precision. In particular, the edges forming each surface are provided with a curved surface with a chamfering degree. It is not shaped.

When using such a conventional head,
When the disk is rotating at a low speed, as shown in FIG.
The surface of the disk 1 does not come into contact with n. However, when the number of rotations increases, the disk 1 becomes, as shown in FIG.
Vertical fluctuations occur. This vertical fluctuation will be described using the actually measured data shown in FIG.

FIG. 9 shows qualitative data of the fluctuation frequency on the horizontal axis and the fluctuation amount on the disk surface on the vertical axis. That is, the fluctuation frequency is the fundamental wave of the disk rotation speed and its harmonics, and the fluctuation level increases as the rotation speed increases. This is due to the fact that it largely depends on the accuracy at the time of sticking the disk, which is a thin film-like soft elastic body, to the hub, and the rotation fluctuation of one cycle is promoted by the rotation speed. Become.

Due to such a fluctuation, the disk 1 exceeds the allowable elastic stress due to impact contact with the edges m, n, q, and r constituting the head, and the surface of the disk 1 is damaged. FIG. 8 schematically shows scratches when recording / reproducing the disk 1 rotating at a high speed for a long time. In particular, k, l, m, n, q, and r at the head edge are shown.
Scratches occur.

Such a phenomenon is caused by the head gap o,
In addition to the occurrence of spacing at the point p, signal loss due to magnetic powder falling off the magnetic layer and mixing in the slider portion cause abnormal wear of the head and damage to the surface of the disk 1.

In order to cope with such a phenomenon, as shown in FIG.
That is, it is possible to realize a stable and highly reliable recording apparatus by forming the recording apparatus not to have a planar shape but to have a radius of curvature, and by optimally arranging the gap positions.

This principle will be described with reference to FIG. FIG. 10 shows heads 4a, 4a
It is a figure which shows the side view of b. In FIG. 10, when the disk 1 rotates, a head 4 generated on the surface of the disk 1 is formed.
The head 4a tilts clockwise by Δθ and the head 4b tilts counterclockwise by Δθ due to the pressure of the viscous air flow drawn between the discs 1 and 4b. This is because, as already described with reference to FIG.
b is configured to be rotatable in the X-axis direction. At the time of high-density head recording and reproduction in which the rotation speed of the disk 1 is high, the rotation angle Δθ shown in FIG. 10 is further increased.

That is, when used at different rotational speeds,
Each rotation speed and the head rotation angle Δθ have a relationship as shown in FIG. 11, and in a state where the head is tilted by the rotation angle Δθ,
The gaps o and p may be arranged on the heads 4a and 4b, respectively, at positions where they come into stable contact with the disk 1.

The radius of curvature near the gap is made larger than the radius of curvature other than near the gap, so that the disc 1
, The contact stable area is widened, and the occurrence of spacing can be suppressed.

FIG. 12 shows an example in which the radius of curvature near the gap is larger than the radius of curvature other than near the gap. As shown in FIG. 12, the radius of curvature forming the vicinity of the gap is R1, and the radius of curvature of the other regions is R2 and R3. In other words, the heads 4a and 4b are divided into three parts, a first area including the gap p, a third area that faces the disk 1 later than the first area, and a first area that precedes the first area. The disk is divided into one surface and a second region facing the disk.

The first region has a radius of curvature R1, the second region has a radius of curvature R2, and the third region has a radius of curvature R3. Further, it also has a radius of curvature R0 in a direction orthogonal to the rotation direction of the disk 1. In this case, the curvature radius R1 is set to be larger than the other curvature radii R2 and R3. The radius of curvature R1 may be an infinite value.

The radius of curvature R0 in the direction orthogonal to the rotation direction of the disk may be the same value or a different value between a plurality of gaps.

The shape of the conventional head described above is similar to that of a slider head for a hard disk. This conventional head presses against the surface of the disk 1 and performs recording and reproduction while sliding in direct contact.

Further, in the prior art, since the disk rotation speed is as low as about 360 rpm, the rotation fluctuation of the disk is small, and in particular, the fluid head shape due to the air layer and the scratch due to the head due to the disk rotation fluctuation are considered. No Super FD for large capacity and high speed transfer
If the disk rotates at a high speed at D and the recording wavelength is shortened for higher density, output deterioration due to spacing and dropout due to scratches on the disk surface are one of the major factors inhibiting performance.

A recording / reproducing apparatus for large-capacity, high-speed data transfer on a floppy disk which is a thin film elastic body;
Alternatively, in a recording / reproducing apparatus having a plurality of formats with different recording capacities and operating speeds, it is necessary to set the tip shape, gap position, and position deviation as in the present invention.

As described above, according to the present invention, in a magnetic recording / reproducing apparatus using a flexible disk, the heads 4a and 4b are rotatable around an axis perpendicular to the rotation direction of the disk, and The surface opposite to the surface of (1) has a predetermined radius of curvature in the rotation direction of the disk 1. As a result, as the disk 1 rotates, the heads 4a, 4b
Is moved in a direction away from the surface of the disk 1, so that the heads 4a and 4b can be prevented from excessively contacting the surface of the disk 1.

In other words, this is a magnetic recording / reproducing apparatus using a flexible disk having low rigidity of the disk, which facilitates dynamic fluctuation by high-speed rotation, and in which a stable air layer film is not easily held between slider heads. In a magnetic recording apparatus using a disk, local and excessive contact between the slider head and the disk is alleviated,
It is possible to realize a magnetic recording device capable of ensuring the durability life of a disk.

[0049]

As described above, according to the present invention,
A magnetic recording / reproducing apparatus that uses a flexible disk with low rigidity, which facilitates dynamic fluctuations due to high-speed rotation and uses a flexible disk that does not easily maintain a stable air layer film between slider heads. In the recording apparatus, it is possible to realize a magnetic recording apparatus capable of relaxing a local and excessive contact state between the slider head and the disk and securing a durable life of the disk.

That is, in the super floppy device of the large-capacity and high-speed data transfer specification, it is possible to provide a recording / reproducing device with high performance and high reliability. In addition, a recording / reproducing device which achieves high performance and high reliability can be realized even in a device corresponding to a plurality of formats having different recording / reproducing conditions.

[Brief description of the drawings]

FIG. 1 is a schematic side view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a schematic plan view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 3 is a partially enlarged perspective view of one embodiment of the present invention.

FIG. 4 is a plan view of the head according to the embodiment of the present invention as viewed from the disk surface side.

FIG. 5 is a perspective view of a head according to an embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a contact state of a head of a conventional flexible disk recording / reproducing apparatus.

FIG. 7 is an explanatory diagram showing a contact state of a head of a conventional flexible disk recording / reproducing apparatus.

FIG. 8 is an explanatory diagram showing a head-disk contact state of a conventional flexible disk recording / reproducing apparatus.

FIG. 9 is a graph illustrating dynamic disk fluctuation of the flexible disk recording / reproducing apparatus according to the embodiment of the present invention.

FIG. 10 is an explanatory diagram showing a disk contact state of the flexible disk recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 11 is a graph showing a relationship between a disk rotation speed and a head rotation angle of a flexible disk recording / reproducing apparatus according to an embodiment of the present invention.

FIG. 12 is an explanatory view showing a modified example of a head shape of a flexible disk recording / reproducing apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flexible disk 2 Spindle motor 2a Spindle 3 Hub 4a, 4b Slider head 5a, 5b Suspension 6 Drive block 7 Drive coil 7a Applied voltage line 8 Chassis 9 Guide rail 10 Magnet

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hideki Maruyama 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Multimedia Systems Development Division of Hitachi, Ltd. (72) Inventor Toshio Tsuchiya Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa 292 Hitachi Media, Ltd. Multimedia Systems Development Division (72) Inventor Teruhisa Miyata 1-88 Ushitora, Ibaraki-shi, Osaka Inside Hitachi Maxell Co., Ltd. (72) Nobuhiro Umebayashi Nobuhiro Uchibayashi, Ibaraki-shi, Osaka 1-88 F-term in Hitachi Maxell, Ltd. (Reference) 5D042 NA03 PA02 PA03 QA01 5D111 AA01 AA24 DD04 DD06 DD22 DD23 EE02

Claims (5)

[Claims] A slider having a plurality of sliding portions at a tip of a suspension made of an elastic material and having a predetermined arm length; Is provided with a slider head having at least two magnetic heads different from each other, and the flexible disk is fixed on both sides by a pair of slider head assemblies in which the magnetic gap surfaces of the slider head face each other in the thickness direction of the flexible disk. In a magnetic recording / reproducing apparatus using a flexible disk which performs recording / reproducing while being pressed by force, a plurality of magnetic heads of a slider head are composed of a magnetic head having a small gap length and a magnetic head having a large gap length. The large magnetic head is in the rotation direction of the flexible disk. With respect to the magnetic head having a smaller gap length, the magnetic head is disposed on the slider head by a predetermined distance, and the contact sliding portion of the slider head with the flexible disk is substantially centered along the rotation direction of the disk. A portion having a plurality of radii of curvature that are convex toward the opposing surface of the disk, and a first region in which the magnetic head is disposed, and a first region ahead of the first region with respect to a rotation direction of the disk. And a third area disposed after the first area in the direction of rotation of the disk with respect to the rotation direction of the disk. The radius of curvature of the first area is:
A magnetic recording / reproducing apparatus using a flexible disk, wherein the radius of curvature is larger than the radius of curvature of the second and third regions. 2. A magnetic recording / reproducing apparatus using a flexible disk according to claim 1, wherein a radius of curvature of said first area is infinite. 3. A magnetic recording / reproducing apparatus using a flexible disk according to claim 1, wherein said contact sliding portion is parallel to a rotating direction of said disk and has two sliding widths different from each other. Flexible, characterized by arranging a magnetic head with a small gap length on a contact sliding part with a narrow sliding width and a magnetic head with a large gap length on a contact sliding part with a wide sliding width. A magnetic recording / reproducing device using a disk. 4. A magnetic recording / reproducing apparatus using a flexible disk according to claim 1, wherein the magnetic head having a large gap length is used when the disk rotation speed is low. A magnetic recording / reproducing apparatus using a flexible disk, which performs a recording / reproducing operation and performs a recording / reproducing operation using a magnetic head having a small gap length when the disk rotation speed is high. 5. A magnetic recording / reproducing apparatus using a flexible disk according to claim 1, wherein the contact sliding portion is arranged along a radial direction of the disk. A magnetic recording / reproducing apparatus using a flexible disk, characterized in that a substantially central portion has a radius of curvature that is convex toward the facing surface of the disk.