JPS62154276A - Recording and reproducing device for magnetic sheet - Google Patents

Abstract

PURPOSE:To stabilize and reduce the driving torque of a magnetic sheet and to obtain a stable contact between a magnetic head and the magnetic sheet over an entire recording track so as to improve the recording and reproducing performance of the magnetic head, by bringing the feeding direction of the magnetic head farther from the surface of the magnetic sheet as going to the outer periphery of the magnetic sheet. CONSTITUTION:The feeding direction of a magnetic head 5 is inclined by a fixed angle A against a magnetic sheet rotary shaft P and the magnetic head 5 is brought farther from the surface of a magnetic sheet 3 as going to the outer periphery of the sheet 3. The inclination in the feeding direction of the magnetic head 5 is produced by, for example, the fitting structure of the feeding screw 6a of a feeding mechanism, with the screw 6A being fitted with an inclined angle A. The flexure of the magnetic sheet 3 is spread radially from the central part and the bent quantity of the magnetic sheet 3 in the radial direction is made smaller. Moreover, the contact of the magnetic sheet 3 with a stabilizing member is made surely by the elasticity of the sheet 3 and, accordingly, the contacting state of the magnetic head with the magnetic sheet 3 is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a flexible magnetic sheet recording/reproducing bag, and more particularly to a device for stabilizing the contact between a magnetic head and a magnetic sheet.

1. Prior Art 1. An information recording/reproducing device using a flexible circle 51 magnetic sheet and a magnetic head, such as a floppy disk, has conventionally been developed by sandwiching the magnetic sheet surface so that the magnetic head stably contacts the rotationally driven magnetic sheet surface. A stabilizing member (pad) is provided opposite the magnetic head.

Various types of stabilizing members have been proposed in the past.
The one in which the groove facing the magnetic head is not formed all the way to the outer periphery of the magnetic sheet (Japanese Unexamined Patent Publication No. 57-113459)?
One in which vertical bristles are provided on both flat surfaces of the magnetic head (A, 18385/1985), one in which both flat parts of the magnetic head have curvature (Japanese Utility Model Publication No. 513,980/1982),
The groove width is narrowed at the outer periphery of the magnetic sheet (Japanese Patent Laid-Open No. 1983
-93875 publication), and one in which the stabilizing member is moved together with the movement of the magnetic head (Japanese Patent Application Laid-open No. 80-93875 +
l1l), which keeps the groove width constant to reduce the occurrence of scratches on the sheet and reduce the motor load (Japanese Patent Application Laid-Open No. 11744-11744)
Publication No. 8) etc.

Although it is possible to obtain a certain degree of recording and reproducing performance with these conventional techniques, in order to ensure contact with the magnetic head over the entire recording track from the inner circumference to the outer circumference of the magnetic sheet, it is necessary to use a stabilizing member and a magnetic The force that holds the magnetic sheet between the heads must be strong, and the magnetic sheet requires a high driving torque, and the driving torque varies greatly between the outer periphery and the center, and the sheet surface is easily damaged. was there. In addition, in the case of ultra-small magnetic sheets such as 2-inch floppy disks, the stabilizing member is omitted as shown in FIG. 7, and the elasticity of the magnetic sheet 1 is used to maintain contact between the magnetic helad 2 and the magnetic sheet 1. There is something to be gained. In this case, the driving torque of the magnetic sheet can be reduced, but when the magnetic head 2 is located on the outer periphery of the magnetic sheet (1), when the magnetic sheet (1) rotates at high speed, its elasticity causes vibrations between the magnetic sheet (1) and (2). This caused problems such as contact (unruliness) and escape of the outer periphery, making recording and reproducing impossible.

An object of the present invention is to provide a recording/reproducing device that can obtain stable contact between a magnetic sheet and a magnetic head over the entire recording track while stabilizing and reducing the driving torque of the magnetic sheet. It is on offer.

1. Structure of the Invention 1. The present invention provides a magnetic system in which a rotatably driven flexible disc magnetic sheet is sandwiched between a magnetic head and a stabilizing member, and the magnetic head is sent in the radial direction of the magnetic sheet to change recording tracks. In the sheet recording and reproducing apparatus, the feeding direction of the magnetic heald is inclined in a direction closer to the outer periphery of the magnetic sheet, the further away from the surface of the magnetic sheet when no force is applied to the magnetic sheet.

One Embodiment - FIG. 1 is a main part configuration diagram showing one embodiment of the present invention. The magnetic sheet 3 is attached to a sheet rotating shaft P of a servo motor or the like by a center core 4 and driven to rotate at a constant speed. The magnetic head 5 is fed in the radial direction of the magnetic sheet 3 by a feeding mechanism 6 driven by a stepping motor or the like, and the head surface is placed on the magnetic sheet 3 in a recording range from the inner circumference to the outer circumference. sliding contact is made over the entire length. The stabilizing member 7 is arranged opposite to the magnetic head 5 with the magnetic sheet 3 interposed therebetween. For example, as shown in a perspective view in FIG. 2, this stabilizing member 7 has a parallel groove portion 7A along the radial direction of the magnetic sheet 3, and extends to the end surface of the groove portion 7A at the outer peripheral end portion of the magnetic sheet 3. It has a rising outer edge 7B, and when the magnetic head 5 and the magnetic sheet 3 are in contact, the groove 7A is formed as shown in FIG.
Magnetic sheet 3 is formed at three locations by both side end faces and outer edge 7B end face.
We are trying to regulate.

What should be noted here is the feeding direction of the magnetic hand 5 (
The trunking direction) is inclined by a certain angle A with respect to the sheet rotation axis P, so that the closer to the outer periphery of the magnetic sheet 3, the further the magnetic rad 5 is from the surface of the magnetic sheet 3. This inclination in the feeding direction of the ri1 air head 5 is achieved, for example, by a mounting structure in which the feed screw 6A of the feeding mechanism 6 is set at an inclination angle of A. Note that, in accordance with the inclination of the magnetic head 5 in the feeding direction, the stabilizing member 7 is also structured to be inclined with respect to the sheet rotation axis P in the radial direction of the magnetic sheet 4.

The reason why good contact can be obtained between the magnetic head 5 and the magnetic sheet 3 with this configuration will be explained below.

Figure 4 shows a magnetic sheet 3 in a conventional system in which the feeding direction of the magnetic head (indicated by an arrow) is perpendicular to the direction of the sheet rotation axis.
This diagram schematically shows the deflection of . In this case, the elasticity of the magnetic sheet 3 does not contribute in any way to the contact with the magnetic head, and the contact force between the magnetic head and the magnetic sheet is due to the pinching force between the stabilizing member, and as described above, a good In order to achieve contact, a large seat drive torque is required, and the drive torque between the outer periphery and the center varies greatly, and the seat surface is easily damaged.
There is also a risk that the magnetic sheet itself may become distorted due to the moment in the rotational direction.

FIG. 5 schematically shows the deflection of the magnetic sheet 3 when the feeding direction of the magnetic head is set such that the position of the magnetic head becomes higher toward the outer periphery of the magnetic sheet. In this case, the magnetic sheet 3 is bent upward from the horizontal plane of the magnetic sheet at its central portion, and bent downward from the horizontal plane of the magnetic sheet at the outer periphery by the stabilizing member, causing the magnetic sheet 3 to bend in the radial direction. As the amount of bending increases, a strong bending moment is applied near the center of the magnetic sheet 3, resulting in distortion of the magnetic sheet and an increase in driving torque. This tendency becomes more pronounced as the magnetic sheet becomes smaller.

FIG. 6 schematically shows the deflection of the magnetic sheet 3 in this example. In this case, the deflection of the magnetic sheet 3 spreads radially from its center, and the amount of deflection in the radial direction of the magnetic sheet is small. Become. Furthermore, the elasticity of the magnetic sheet 3 ensures contact with the stabilizing member, which in turn ensures reliable contact with the magnetic head.

Therefore, the pinching force between the magnetic head and the stabilizing member is made relatively weak and the driving torque is reduced, while the contact force and rotational driving force are stable from the center to the outer periphery of the magnetic sheet, resulting in good recording. It is possible to obtain playback performance. especially,
When applied to a device using an ultra-small magnetic sheet such as a 2-inch floppy disk, good performance can be obtained by reducing the amount of deflection of the magnetic sheet.

In addition, in the embodiment, the shape of the groove portion 7A of the stabilizing member 7 is not limited to the illustrated structure, and other conventional shapes can be used to obtain the same effect. A good effect was obtained when the angle A (FIG. 1) was in the range of 0.5 to 20.

-Effects of the Invention- As described above, according to the present invention, the feeding direction of the magnetic head is made to move farther from the surface of the magnetic sheet toward the outer periphery of the magnetic sheet, so that the driving torque of the magnetic sheet can be stabilized and reduced. This has the effect of improving recording and reproducing performance by obtaining stable contact over the entire recording track. Particularly, it is effective when applied to ultra-small magnetic sheets.

[Brief explanation of drawings]

FIG. 1 is a main part configuration diagram showing an embodiment of the present invention, FIG. 2 is a perspective view of the stabilizing member in FIG. 1, FIG. 3 is a diagram showing the state in which the magnetic sheet is regulated by the stabilizing member, 4 and 5 are schematic diagrams showing the deflection state of the magnetic sheet according to the conventional configuration, FIG. 6 is a schematic diagram showing the deflection state of the magnetic sheet in FIG. FIG. 3... Magnetic sheet, 4... Center core, 5...
Magnetic head, 6... feed mechanism, 6A... feed screw,
7... Stabilizing member, P... Seat rotation axis. Figure 1 A Figure 3 Figure 6 Figure 7

Claims (1)

[Claims] 1) A magnetic sheet recording/reproducing device in which a rotationally driven flexible disc magnetic sheet is sandwiched between a magnetic head and a stabilizing member, and the recording track is changed by sending the magnetic head in the radial direction of the magnetic sheet, A magnetic sheet recording/reproducing device characterized in that the feeding direction of the magnetic head is tilted in a direction closer to the outer periphery of the magnetic sheet, the further away from the surface of the magnetic sheet in a state where no force is applied to the magnetic sheet.