JPH0490167A - Disk recording and reproducing device - Google Patents

Abstract

PURPOSE:To enable the head touch with uniform contact force by constituting the device in such a manner that a disk is inclined and the head is moved to push up the disk low on its inner circumferential side and high on its outer circumferential side. CONSTITUTION:The disk 22 is inclined to make a down slope toward the contact side of the head 20, while a negative pressure slider 21 equipped with the magnetic head 20 is moved parallel to a horizontal line B in the radial direction of the magnetic disk 22, so that the magnetic disk 22 is pushed up by the magnetic head 20. By this method, the magnetic head 20 is brought into contact with the magnetic disk 22 from the inner circumferential side to the outer circumferential side under approximately constant contact force, while by sucking force of the negative pressure slider 21, a heightwise fluctuation of the magnetic disk 22 is prevented, so as to achieve good head touch.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention: Field of the Invention The present invention relates to a disk recording and reproducing apparatus that uses a flexible disk as a recording medium and records or reproduces various information such as image information, audio information, and numerical information.

"Prior Art" A recording/reproducing device using a flexible memory disk is widely known as, for example, a magnetic disk recording/reproducing device.

This type of recording and reproducing apparatus rotates a magnetic disk at high speed, moves a magnetic head in the radial direction while contacting the disk, and magnetically records and reproduces information at a predetermined position.

Such a recording/reproducing apparatus is equipped with a negative pressure slider brought close to the magnetic disk surface as a means for preventing unstable head contact caused by vibrations of the magnetic disk or the like.

FIG. 3 is a mechanical diagram showing only the negative pressure slider 11 equipped with the magnetic head 10 and the magnetic disk 12 with the head 10 in contact.

The magnetic disk 12 is configured to rotate at high speed by loading a center core 12a onto a turntable of a spindle motor, but for convenience, these components are shown as a rotating shaft JI113.

Further, the negative pressure slider 11 is a small disc-shaped member having an annular protrusion along its periphery, and a magnetic head 1o integrally fixed thereto protrudes from the center.

This negative pressure slider 11 is fixed to the Herad carriage, and is placed very close to the plate surface of the magnetic disk 12 in the radial direction of the disk 12 (arrows 14a, 14 in the figure).
b direction).

In this conventional example, the height of the tip of the magnetic head 10 is the same as or close to the height of the plate surface of the magnetic disk 12.

In the negative pressure slider 11 provided in this manner, when the magnetic disk 12 rotates at high speed, negative pressure is generated within the annular protrusion, and the surrounding disk portion in contact with the magnetic head 10 is drawn toward the slider.

That is, since the pressure between the negative pressure slider 11 and the magnetic disk 12 becomes slightly lower than the external pressure on the upper surface of the magnetic disk 12, the magnetic disk 12 sinks toward the inside of the annular protrusion, and as a result, the magnetic disk 12 It acts to stabilize the head position of the magnetic head 10 relative to the magnetic head 10.

FIG. 4 is a partial mechanical diagram of a recording/reproducing apparatus in which the magnetic head 1o is made higher than the stationary surface 15 of the magnetic disk 12, and sufficient contact pressure is obtained by the pushing force of the magnetic head 10. be.

Further, in this conventional example, the negative pressure slider 11 is tilted at an angle θ to improve the space loss of the magnetic head 10.

In other words, if the angle θ is not applied to the negative pressure slider 11, a space loss will occur at the tip of the magnetic head 10 as shown in FIG. Since the negative pressure slider 11 and the magnetic head 10 are inclined at a close angle θ, space loss is improved as shown in FIG.

``Problems to be Solved by the Invention'' Since the conventional example shown in FIG. 3 relies only on the adsorption force of the negative pressure slider 11, the contact of the magnetic head 10 is extremely unstable due to variations in the height of the magnetic disk 12. Become. Also,
Since the rigidity of the disk increases on the inner circumferential side (center core side) of the magnetic disk 12, the adsorption force of the negative pressure slider 11 becomes weaker, and on the contrary, the adsorption force becomes stronger on the outer circumferential side of the magnetic disk 12. A constant contact force of the magnetic head 10 cannot be obtained.

In the conventional example shown in FIG. 4, the contact force of the magnetic head 10 increases relatively, which is advantageous against height fluctuations of the magnetic disk 12. As in the conventional example, the contact force of the magnetic head 10 is not constant. Moreover, in the case of this conventional example, the magnetic head 10 and the negative pressure slider 11 must be attached at a predetermined angle, making assembly and angle adjustment laborious work.

As described above, if the contact force of the magnetic head 10 is not constant between the inner and outer circumferential sides of the magnetic disk 12, the data written and read may vary or become unreliable. In addition, problems such as uneven wear of the magnetic disk 12 occur.

In view of the above-mentioned circumstances, it is an object of the present invention to develop a disk recording and reproducing device in which the contact force of the recording and reproducing head is constant regardless of whether it is on the inner circumferential side or the outer circumferential side of the disk, which is a recording medium.

[Means for Solving the Problems] In order to achieve the above object, the present invention includes a flexible disk as a recording medium, and performs recording by moving a head in contact with the rotating surface of the disk in the radial direction of the disk. Alternatively, the present invention proposes a disc recording/reproducing apparatus for reproducing a disc, characterized in that the disc is tilted so as to slope downward toward the contact side of the head, and the head moves while pushing up the disc. .

``Operation'' Because the disk is tilted with respect to the head that moves in the radial direction of the disk, the disk is pushed up by the head, causing the disk to curve along the direction of movement of the head.

Since the disk rotates in this state, the head contacts with sufficient contact force, and the contact force is constant between the inner and outer circumferential sides of the disk.

"Example" Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a mechanical diagram showing the main parts of the present invention.

As shown in the figure, the rotational axis 23 of the magnetic disk 22 has an angle of θ1 with respect to the vertical line A.

Specifically, a spindle motor is provided so that the rotation axis 23 becomes the rotation axis, and the center core 22a of the magnetic disk 22 is mounted on the turntable.

The magnetic disk 22 rotated at high speed in this manner is inclined like a steady plane 25 in the figure. Incidentally, the inclination angle θ of the rotation axis 23 is determined in consideration of the curvature of the magnetic disk 22 and the contact pressure with the magnetic head 20.

Further, the negative pressure slider 21 including the magnetic head 2o is configured to move in the radial direction of the magnetic disk 22 (in the direction of arrows 24a and 24b shown in the figure) so as to be parallel to the horizontal line B. In this area, the magnetic head 20 pushes up the magnetic disk 22.

Note that the magnetic head 2o and negative pressure slider 21 are the same as those in the conventional example.

With the above configuration, the magnetic head 20 is connected to the magnetic disk 2.
The magnetic disk 22 is in contact with a substantially constant contact force from the inner circumferential side to the outer circumferential side of the magnetic disk 22, and the attraction force of the negative pressure slider 21 prevents the height of the magnetic disk 22 from fluctuating, resulting in a good head touch.

FIG. 2 is a diagram for explaining the present invention in detail.

In this figure, the deflection ω when a load P is applied to the tip of the cantilever beam 30 is ω=e EI . However, E is Young's modulus, and ■ is the moment of inertia of area.

As can be seen from this equation, if the load P is constant, the deflection ω is proportional to the cube of the length α of the cantilever beam 30.

Conversely, if the load P is constant, the further the cantilever beam 30 goes, the larger the deflection ω becomes.

Therefore, if the load P is replaced with the contact force of the magnetic head 20, the amount of deflection of the magnetic disk 22 must be increased in order to obtain a constant contact force.

In other words, it can be seen that an appropriate contact force cannot be obtained unless the disk is lifted higher by the magnetic head 20 as it approaches the outer circumference of the magnetic disk 22.

The above-described embodiment has a configuration that satisfies the above principle by tilting the magnetic disk 22, and the further the magnetic head 20 moves toward the inner circumference of the magnetic disk 22, the lower the disk push-up height becomes. The push-up height increases, and the contact force of the magnetic head 20 becomes uniform.

Furthermore, since the magnetic disk 22 has an inclination that takes into account the curvature caused by the pushing up of the magnetic head 20, the magnetic head 20 comes into contact with the magnetic disk 22 in an appropriately close state, so that space loss is extremely reduced.

Although one embodiment of the present invention has been described above, it can be similarly implemented with a configuration in which the magnetic disk 22 is rotated horizontally and the magnetic head 20 is moved along a traveling path with a predetermined angle.

In the present invention, since the magnetic head 20 contacts the magnetic disk 22 with uniform contact force, a positive pressure slider may be provided in place of the negative pressure slider 21.

It is also possible to implement a configuration in which the positive or negative pressure slider is removed.

[Effects of the Invention] As described above, in the present invention, by tilting the disk, the head moves lower on the inner circumference side of the disk and moves higher on the outer circumference side, pushing the disk up. The head can be brought into contact with uniform contact force regardless of the inner circumferential side or the outer circumferential side, and space loss is minimized.

As a result, a highly reliable disk recording and reproducing device is achieved, with extremely little variation in recorded or reproduced data and uneven wear of the disk.

Furthermore, since the disks can be tilted, compatibility of the disks is maintained, and in addition, assembly is easy.
This provides a disc recording and reproducing device that can be implemented at low cost.

[Brief explanation of the drawing]

Fig. 1 is a mechanical diagram showing a part of a magnetic disk recording/reproducing device embodying the present invention, Fig. 2 is a diagram for explaining the present invention in detail, and Figs. 3 and 4 are conventional magnetic disk recording devices. FIG. 5 is a schematic diagram showing a part of the reproducing apparatus, FIG. 5 is a simplified diagram showing a space loss state of the magnetic head, and FIG. 6 is a simplified diagram showing a contact state of the magnetic head with no space loss. 20...Magnetic head 21...Negative pressure slider 22...Magnetic disk 23...Rotation axes 24a, 24b...Arrows indicating the moving direction of the magnetic head

Claims (1)

[Claims] In a disk recording/reproducing device that is equipped with a flexible disk as a recording medium and records or plays back by moving a head in contact with the rotating surface of the disk in the radial direction of the disk, there is a device that slopes downward toward the contact side of the head. 1. A disk recording and reproducing device characterized by having a structure in which the disk is tilted and the head moves while pushing up the disk.