JPH0675332B2 - Recording or playback device - Google Patents

Description

The present invention relates to a recording or reproducing apparatus that uses a flexible disk sheet as a recording medium, and in particular, stabilizes a head touch using an air flow generated by rotation of the sheet. The present invention relates to a recording or reproducing device.

[Conventional technology]

Generally, in the recording or reproducing apparatus as described above, when a recording or reproducing head (hereinafter abbreviated as a head) is brought close to a disk that rotates at a high speed, the head and the disk face each other due to the airflow generated by the rotation of the disk. The state cannot be maintained stably and satisfactorily, resulting in a drawback that the recording or reproducing performance is deteriorated.

In order to solve this, in recent years, a stabilizing member is provided on the opposite side of the head through a disc, as will be described later with reference to FIG. 1, so that the air flow generated by the disc is not only generated between the head and the disc but also the stabilizing member and the disc. There is an effort to keep the head and disk facing each other stably and satisfactorily.

In FIG. 4, 1 is a flexible recording medium.
A disk is, for example, a magnetic disk, and a center core 2 made of plastic, for example, is attached to the central portion of the disk, the center core 2 is attached, and the disk rotation motor 3 is attached in the center hole 2a of the center core 2. Mounted on the spindle 3a of, for example, arrow A in the figure
Direction at a predetermined speed (if a still image recording or playback device,
For example, 3600 rpm) can be rotated. Reference numeral 4 denotes a recording or reproducing head, for example, a magnetic head, which is supported by a head moving table 7 (FIG. 5), and is moved by the moving table 7 in the radial direction of the disk 1 as shown by an arrow B in the figure. Be moved to. As a result, a concentric or spiral recording track is formed on the recording surface of the disk 1 when recording a signal. Reference numeral 5 denotes a stabilizing member which is provided in a relation facing the head 4 with the disk 1 interposed therebetween for the purpose of stabilizing the disk 1 in the portion passing through the head 4 as described above.
As shown in detail in the drawing, when the head 4 is moved in the direction of the arrow B in FIG. 4 to avoid the collision with the head on the disk facing surface, the disk 1 is affected by the air flow accompanying the rotation of the disk 1. A positive pressure is generated between the stabilizing member 5 and the upstream facing surface 5a, and the disk 1 is pushed down in this portion, while a negative pressure is generated between the downstream facing surface 5b.
A phenomenon occurs in which the disk 1 is attracted to the side of the stabilizing member 5 against its rigidity. As a result, as shown in FIG. 5, the downstream facing surface 5b of the stabilizing member 5 and the disk 1 are likely to come into contact with each other, and when they come into contact with each other, the stabilization of the facing state between the head 4 and the disk 1 is hindered, and , Disk 1
The abrasive contained in the binder in the magnetic layer (eg Si
A situation occurs in which O ₂ and TiO ₂ ) scratch the opposing surface 5b of the stabilizing member 5. Then, the abrasive that is peeled off from the disk 1 due to contact is adsorbed to the scratches on the stabilizing member 5 and causes an abnormal depth to the motor 3 that rotates the disk 1 to deteriorate the surface of the stabilizing member, and the servo operates normally. It may not work. In addition, the abrasive adsorbed on the stabilizing member 5 has a groove 5c having a rectangular cross-section with a constant opening width corresponding to the polishing path included in the binder in the magnetic layer of the disk 1. In the rotational direction A of the disc 1, the groove 5c is divided into an upstream facing surface 5a and a downstream facing surface 5b. Reference numeral 6 denotes a back plate which is provided as necessary and has a long hole 6a, and the head 4 projects toward the disk 1 side through the long hole 6a.

[Problems to be solved by this invention]

Now, the stabilizing member 5 described above is made to face the upper surface of the disk 1, that is, the surface opposite to the recording surface in the vicinity thereof, as shown in FIG. Slightly protruding into the concave groove portion 5c of the
It is made to project and face the recording surface of the disk 1 so as to be at the same level as a and 5b, and the back plate 6 faces the recording surface of the disk 1 at a distance larger than that of the stabilizing member 5. To be made.

When the disk 1 is rotated in the direction of arrow A in such a state, the disk 1 is affected by the airflow accompanying the rotation of the disk 1.
A positive pressure is generated between the stabilizing member 5 and the upstream facing surface 5a, and the disk 1 is pushed down in this portion, and a negative pressure is generated between the stabilizing member 5 and the downstream facing surface 5b. However, a phenomenon occurs in which is attracted to the side of the stabilizing member 5 against its rigidity. As a result, as shown in FIG. 5, the downstream facing surface 5b of the stabilizing member 5 and the disk 1 easily come into contact with each other,
When they contact each other, the stabilization of the opposing state of the head 4 and the disk 1 is hindered, and the abrasive contained in the binder in the magnetic layer of the disk 1 (eg, SiO ₂ , TiO ₂
And the like) scratches the opposing surface 5b of the stabilizing member 5. Then, the abrasive which is peeled off from the disk 1 by contact and adsorbed on the scratches of the stabilizing member 5 imposes an abnormal load on the motor 3 for rotating the disk 1 to deteriorate the surface of the stabilizing member, and the servo operates normally. It may not work. Further, the abrasive adsorbed on the stabilizing member 5 further promotes the exfoliation of the abrasive contained in the binder in the magnetic layer of the disk 1, and it goes around the head 4 to accelerate the wear of the head 4. It also happens.

All of these phenomena are caused by the contact between the disk 1 and the stabilizing member 5 caused by the negative pressure.

The present invention provides a recording or reproducing apparatus capable of stably and favorably maintaining the facing state of a head and a flexible disk with a simple means and preventing damage to the stabilizing member and the disk. It is an object.

[Means for solving problems]

In order to achieve such an object, a recording or reproducing head that is movable in the radial direction of the flexible disk and a concave groove portion that is provided so as to face the head through the disk and that corresponds to the moving path of the head. In a recording or reproducing apparatus including a disk stabilizing member having a disc stabilizing member, the concave groove portion of the stabilizing member is formed such that the opening width on the center side of the disk is larger than the opening width on the outer peripheral side of the disk. On the downstream side of the groove portion in the rotating direction of the disk and in the vicinity of the groove portion, there is provided a slope for generating a positive pressure, the width of which widens from the outer peripheral side of the disk toward the center side of the disk.

[Action]

An air flow is generated between the head, the disk and the stabilizing member as the disk rotates.

Since the deformation characteristics of the disk differ from the center to the outer circumference, the distance between the disk and the head changes accordingly, but the slope for generating a positive pressure on the downstream side of the air flow in the groove provided in the stabilizing member. Since the width of this slope becomes smaller from the center side of the disk toward the outer peripheral side, the force acting on the disk by the positive pressure is almost uniform from the center side of the disk to the outer peripheral side. The distance between the disks becomes stable.

〔Example〕

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

First, FIG. 1 is a perspective view of a disk-opposing surface of a stabilizing member according to an embodiment of the present invention as seen obliquely from above, and FIG. 2 is a view showing a state in which the stabilizing member is incorporated in an apparatus. Inside, arrow A indicates the rotation direction of the disk 1, and C indicates the direction of the center core.

First, as shown in FIGS. 6 (a) and 6 (b), the expansion in the disk circumferential direction of the deformation given to the disk 1 by the protrusion of the head 4 is affected by the center core 2 and the disk 1 is deformed. It is wide on the rotation center side and narrows as it moves away from the center in the radial direction. Therefore, the stabilizing member 51 shown in FIG. 1 has a shape formed by the recessed groove portion 51c for head escape formed on the surface facing the disk and the inclined surface 51d according to the deformation (1a) of the disk 1 described above. The opening width d ₁ on the center side is larger than the opening width d ₂ on the outer peripheral side of the disk. Along with this, the stabilizing member
The disk 51 is provided with a disk facing surface 51d on the upstream side and an inclined part 51d and a disk facing surface 51d on the downstream side in the rotation direction of the disk 1 with the groove 51c as a boundary.

Here, a slope 51d for generating a positive pressure is provided adjacent to the groove 51c along the downstream ridges 51e and 51f, and the slope
The width l of 51d increases in the direction of arrow C. When the disc 1 rotates in the direction of arrow A, the inclined portion 51d has a required acute angle in the traveling direction with respect to a portion of the disc that passes through the inclined portion 51d, that is, at a predetermined rotation speed of the disc 1. It is formed with a predetermined inclination angle based on the deformed shape of the disk 1 at the portion passing through the inclined portion 51d so as to form an acute angle so as to obtain a positive pressure. Also,
The disk facing surface 51b is sufficiently retracted from the disk,
The atmospheric pressure is set between the disk 1 and the disk 1.

According to the stabilizing member 51 having the above-described structure, as shown in FIG. 2, when the magnetic head 4 is projected when the disc 1 is rotated, the inclined portion 51 is formed.
Since positive pressure is generated by d, the disk 1
Is pressed downward in FIG. 2, that is, in the direction away from the downstream facing surface 51b. The positive pressure generated in the inclined portion 51d is determined by the shape of the gap between the disk 1 and the inclined portion 51d, that is, the angle formed by the disk 1 and the inclined portion 51d and the width 1 of the inclined portion. The angle formed by the disk 1 and the inclined portion 51d is an angle at which the generated positive pressure becomes smaller on the inner peripheral side than on the inner peripheral side due to the difference in the deformed shapes of the outer peripheral side and the inner peripheral side of the disk 1.

On the other hand, the larger the width 1 of the inclined portion is, the greater the pressing force of the disc 1 is. Therefore, the inclined portion 51d has a larger width toward the inner peripheral side than the outer peripheral side of the disk 1.
Presses the disk 1 on the inner circumference side as well as on the outer circumference side.
That is, the force of separating the disk from the facing surface 51b by the positive pressure is substantially the same on the inner circumference and the outer circumference.

For the above reasons, the disk 1 is effectively pressed, the danger of contact with the stabilizing member 51 is eliminated, and the head 4 and the disk 1 face each other very well.

FIG. 3 shows a case where a disk-opposing surface of a stabilizing member according to another embodiment of the present invention is viewed obliquely from above.

In the above embodiment, the case where the inclination angle of the inclined portion 51d is constant has been described, but as shown in FIG.
Is such that the inclined portion width 1 increases as it goes in the direction of arrow C, and the inclination angle α decreases as it approaches the inner peripheral side in accordance with the deformed shape of the disk. As a result, the force exerted on the disk by the positive pressure can be adjusted to be uniform on the inner peripheral side and the outer peripheral side.

Further, 51b in FIG. 1 may be cut off because it is sufficiently retracted from the disk 1 in order to maintain the atmospheric pressure.

〔effect〕

As explained above, by providing a continuous positive pressure generating slope on the downstream side of the stabilizing member in the disk rotation direction in which the inclination width changes in the head moving direction, the flexible disk during rotation does not contact the stabilizing member. Is effective in stabilizing the contact between the head and the sheet by eliminating uneven rotation of the sheet.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a stabilizing member of the present invention,
FIG. 2 is a vertical cross-sectional view showing an embodiment near the head of a recording apparatus using the stabilizing member of the present invention, and FIG. 3 is a perspective view showing another embodiment of the stabilizing member of the present invention. FIG. 5 is a perspective view showing an embodiment of a recording apparatus using a conventional stabilizing member,
FIG. 6 is a vertical cross-sectional view of a recording apparatus using a conventional stabilizing member near a head, and FIG. 6 is a perspective view showing a deformed shape of a flexible disk. 51 is a stabilizing member, 6 is a back plate, 1 is a flexible disk, and 4 is a head.

Claims (1)

[Claims] 1. A stable disk having a recording or reproducing head movable in the radial direction of a flexible disk and a groove provided in opposition to the head via the disk and corresponding to the moving path of the head. In the recording or reproducing apparatus including the member, the groove portion of the stabilizing member is formed such that the opening width on the disk center side is larger than the opening width on the disk outer peripheral side, and the disk groove is formed in the groove portion. A recording or reproducing apparatus having a slope for generating a positive pressure, the width of which widens from the outer peripheral side of the disk toward the center side of the disk, is provided on the downstream side in the rotation direction of the above and in the vicinity of the concave groove portion.