JPS62114155A - Stabilizing member - Google Patents

Abstract

PURPOSE:To obtain stabilized input and output characteristics for both channels of a double gap head by having a groove part on the face opposing to a magnetic head and by having the edge radially expanding to the outer peripheral side from the center side of the magnetic sheet and the edge part which presses the outer peripheral edge part of the magnetic sheet on this groove part. CONSTITUTION:The deformation of a magnetic sheet becomes in a dome shape nearly corresponding to the groove part 4A of a stabilizing member 4 when the groove part 4A is opposed to the magnetic head by pinching it according to the stabilizing member 4. The magnetic sheet 2 then becomes in the curved shape adequately 6 in its radial direction as well, a good contact state is obtd. on either A channel or B channel, and both channels A and B can obtain good input and output characteristics even if a double gap head 6 is moved to either part of the core part 6, center part 6 and outer peripheral part 6 of the magnetic sheet 5, and also it is good on the input and output characteristics of a single gap head.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a stabilizing member for stabilizing contact between a magnetic head and a flexible magnetic sheet.

1. Prior art 1. Information recording and reproducing devices using flexible disk magnetic sheets and magnetic heads, such as floppy disks, are magnetically operated by sandwiching the magnetic sheet surface so that the magnetic head stably contacts the magnetic sheet surface that is driven once. A stabilizing member (pad) is provided opposite the head.

Various types of stabilizing members have been proposed in the past, including those in which the groove facing the magnetic head is not formed all the way to the outer periphery of the magnetic sheet (particularly the former Publication No. hair (Jitsukai 6)
0-16385 Publication), a magnetic head with a curvature on both side planar portions (Actual Opening/Closing BO-5139ElO Publication),
The groove width is narrowed on the outer circumferential side of the magnetic sheet (JP-A-Sho Be
-93675- Publication), and one in which the stabilizing member is moved along with the movement of the magnetic head (Japanese Patent Application Laid-open No. Sho-eo-s3e74y;
- Publications) etc.

These conventional technologies mainly use the Ginoggle gap head (6th
The structure of the stabilizing member is inappropriate for simultaneous recording and reproduction of two tracks using a double gap head (shown in FIG. 7), which has recently become mainstream.

That is, as shown in FIG.
Since the A channel and B channel are arranged in parallel with a track width gap in the radial direction of the magnetic sheet 2, and the magnetic sheet 2 is sandwiched between the stabilizing member 3, the magnetic The portion of the surface that presses against the sheet 2 becomes wider in the radial direction. For this reason, it becomes difficult to obtain good recording and reproduction for both channels A and B.
A slight inclination of the double gap head 1 or the stabilizing member 3 deteriorates the recording and reproducing performance of one channel.

To explain this situation with reference to FIGS. 9 and 10, in the conventional stabilizing member 3, when the double gap head l is located on the inner peripheral side of the magnetic sheet 2 (FIG. 9), the input/output characteristics of the B channel are It's good, but the A channel is getting worse. Conversely, when the double gap head 1 is located on the outer peripheral side of the magnetic sheet 2 (FIG. 10), the characteristics of the A channel are good and the characteristics of the B channel are poor. This is because the conventional stabilizing member 3 cannot give the magnetic sheet 2 a curvature along the radial direction with respect to the double gap radius l as shown in Figure 11.
A.

This is because sufficient contact cannot be obtained with either of the B channels.

In addition, as disclosed in Japanese Patent Application Laid-Open No. 80-93874, it is possible to stabilize both channels even in a double gap head by moving the stabilizing member in the radial direction together with the magnetic head. This requires a small moving mechanism, and it becomes difficult to make the stabilizing member follow delicate adjustments of the magnetic head.

-Object of the Invention 1 An object of the present invention is to provide a stabilizing member that can provide stable input/output characteristics to both channels even in a double gap head while eliminating the need for a complicated mechanism.

- Structure of the Invention 1 The present invention provides a stabilizing member that is disposed opposite to a magnetic head with a flexible disc-shaped magnetic sheet in between and stabilizes contact between the magnetic head and the magnetic sheet that is rotationally driven. The surface facing the magnetic head is recessed, and the recess extends radially from the center of the magnetic sheet to the outer periphery, and the outer periphery rises up to the end surface in accordance with the curvature of the circumferential surface of the magnetic sheet. It is.

One Embodiment - FIG. 1 is a perspective view showing one embodiment of the present invention. The stabilizing member 4 has a groove portion 4A on the surface facing the magnetic head with the magnetic sheet in between. As shown in the figure, this groove has a fan shape with a width W that spreads radially, and the direction in which the groove width W widens (the direction indicated by the arrow) is the direction outward from the rotation center of the magnetic sheet.

Further, the stabilizing member 4 is provided with an edge 4B that rises toward the flat surface from the groove 4A at a position facing the outer peripheral portion of the magnetic sheet.

It is preferable that the depth of the groove 4A is approximately constant from the position corresponding to the core to the position corresponding to the outer periphery of the magnetic sheet during rotation of the magnetic sheet, or that the depth of the groove 4A is slightly deeper as the outer force increases.

In the illustrated embodiment, the edge 4A' of the groove 4A is straight, but it may be a gentle curve.

According to the stabilizing member 4 having such a structure, when the groove portion 4A is opposed to the magnetic head with the magnetic sheet in between, the deformation of the magnetic sheet is caused by the deformation of the groove portion 4A of the stabilizing member 4 as shown in FIG.
It has a dome-like shape that roughly corresponds to A, and when the double gap head 6 is moved to any of the central part 61, central part 62, and outer peripheral part 63 of the magnetic sheet 5, A,
Good input/output characteristics were obtained for both B channels, and this was also confirmed through experiments. In addition, the input/output characteristics of the single gap head were also good.

Regarding this point, the deformation of the magnetic sheet by the conventional stabilizing member is as shown in FIG. 3 or 4, and in FIG. There is no curved surface along the line, making it difficult to obtain good input/output characteristics for both the A and B channels.

In addition, in the case shown in Fig. 4, the deformed state due to the same groove width,
Otherwise, the deformation occurs due to the stabilizing member having a wide inner groove width, making it difficult to obtain good input/output characteristics for both channels A and B over the entire track.

FIG. 5 is a perspective view showing another embodiment of the present invention.
A non-woven fabric 7 is pasted on the surface of the stabilizing member 4 shown in the figure.The non-woven fabric 7 eliminates scratches on the magnetic sheet surface and further improves good contact between the magnetic head and the magnetic sheet. Improve.

Note that although the example shows a case in which the groove portion is recessed with a constant curvature, the same effect can be obtained even if the recess has a step difference.

-Effects of the Invention- As described above, according to the present invention, the structure is such that the outer circumference has a radially extending recess facing the magnetic head, and the outermost circumference rises up to the groove end surface. This has the effect of ensuring reliable contact with the magnetic sheet no matter where the track position is, and that stable input/output characteristics can be obtained for both channels, especially in a double gap head.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing one embodiment of the present invention, and FIG. 2 is a perspective view showing one embodiment of the present invention.
Figure 3 shows the deformed state of the magnetic sheet by applying the above.
4 and 4 are diagrams showing the state of deformation of the magnetic sheet by a conventional stabilizing member, FIG. 5 is a perspective view showing another embodiment of the present invention, FIG. 6 is a perspective view of a single gap head, and FIG.
The figure is a perspective view of the double gap head, Figure 8 is a diagram showing the arrangement structure of the double gap head and the stabilizing member, and Figures 9 and 10 are the contact of the double gap head and the conventional stabilizing member to the magnetic sheet. Side sectional view showing the state, 1st
FIG. 1 is a diagram showing a preferable radial contact state between the double gap head and the magnetic sheet. l...double gap head, 2...magnetic sheet,
3... Stabilizing member, 4... Stabilizing member, 4A...
Groove, 4B...Edge, 5...Magnetic sheet. 6...Double gap head, 7...Nonwoven fabric. Patent applicant Roku Konishi Photo Industry Co., Ltd. Figure 11'
F''' IL/Procedure-31F-Book (effective December 6, 1985)

Claims (1)

[Claims] 1) A stabilizing member that is disposed facing the magnetic head with a flexible disk-shaped magnetic sheet in between and stabilizes contact between the magnetic head and the rotationally driven magnetic sheet, the surface facing the magnetic head being A stabilizing member characterized by a structure in which the depression extends radially from the center side of the magnetic sheet to the outer peripheral side, and the outer peripheral edge rises up to the end face in accordance with the circumferential curvature of the magnetic sheet.