JPS62208457A - Flexible magnetic sheet recording and reproducing device - Google Patents

Abstract

PURPOSE:To execute the stable recording and reproducing by providing a regulating member to be installed at a stabilizing member and made to but on the outer circumferential part of other surface of a magnetic sheet and pushing the magnetic sheet outer circumferential part stronger than the inner circumferential part with the regulating member. CONSTITUTION:A regulating member 8 is arranged vertically in the length wise direction of stabilizing member 1 and fitted at the stabilizing member 1. Since the regulating member 8 is abutted on the outer circumferential part of a magnetic sheet 2 and fitted so as to project more than the stabilizing member 1, the outer circumferential part of the magnetic sheet 2 is pressed stronger. Since the regulating member 8 having the parallel surface in the rotating direction of the magnetic sheet 2 is descended more than the stabilizing member 1 and the outer circumferential part of the magnetic sheet 2 is pressed, a sheet drag is equalized. Especially, since the outer circumferential part of the magnetic sheet 2 is pressed by the regulating member 8 over the side scope, the surface vibration of the outer circumferential part is suppressed, the sheet drag is equalized, the extreme stress collection will not occur and the scratch will not occur at the magnetic sheet. Thus, a stable recording and reproducing is executed.

Description

[Detailed Description of the Invention] [Object of the Invention] (Field of Application in the Ordinary Industry) The present invention relates to flexible magnetic sheet recording in which a flexible magnetic sheet is rotated and a magnetic head is brought into contact with the flexible magnetic sheet to record and reproduce signals. Regarding a playback device.

(Prior Art) In recent years, so-called electronic still cameras, which capture images using solid-state imaging devices and record them as still images in memory, have attracted attention and become a hot topic. In this electronic still camera, a flexible magnetic sheet is generally used as an image memory. Magnetic sheets have a larger storage capacity than semiconductor memories, but in response to demands for improved image quality and miniaturization of electronic still cameras, it is desired that magnetic sheets have a higher recording density so that sufficient capacity can be obtained with smaller diameter sheets. In order to increase the density of magnetic recording, it is required that the sliding contact between the magnetic head and the magnetic sheet be extremely stable and good.

FIG. 12 shows the basic configuration of such a flexible magnetic sheet recording/reproducing device, in which a magnetic sheet jacket 5 consisting of a magnetic sheet 2 housed in a flat package 6 is attached to a flexible magnetic sheet (not shown). When attached to the main body of the magnetic sheet recording/reproducing apparatus, the magnetic sheet 2 is fixed to the center hub 4, and the magnetic head 3 provided on the main body comes into contact with the magnetic sheet 2. Note that FIG. 13 is a sectional view taken along the line XX in FIG. 12 along the running direction of the magnetic sheet 2. FIG. 14 is a sectional view taken along the Y-Y line in FIG. 12 along the moving direction of the magnetic head.

By the way, in order to facilitate the handling of the magnetic sheet jacket 5 in order to meet the demand for miniaturization of devices such as electronic still cameras, the package 6 is formed to have a small size of about 5 cIn on each side, and the magnetic sheet 2 housed in the package 6 is also small. Diameter only 45
It has an extremely small shape of about 1. When the shapes of the package 6 and the magnetic sheet 2 become smaller in this way, a layer of air between the magnetic sheet 2 and the package 6 is induced by the rotation of the magnetic sheet 2 within the package 6, which contributes to the stable rotation of the magnetic sheet 2. It becomes difficult to obtain sufficient flow effects and centrifugal force of the magnetic sheet 2 itself. In this state, when an attempt is made to bring the magnetic head 3 into contact with the recording surface of the magnetic sheet 2, the magnetic sheet 2 tends to escape to the opposite side of the magnetic head 3, making the sliding contact state extremely unstable. . Therefore, spacing loss is likely to occur, making stable recording and reproduction impossible.

In order to solve the problem of reducing the size of the package 6 and the magnetic sheet 2, as shown in FIG.
,. A proposal has been made to try to stabilize the running of □1□yu1.2woot2.

This stabilizing member 1 is centered around the position of the magnetic head 3.
The magnetic sheet 2 has a pair of opposing surfaces facing the magnetic sheet 2 at the front ntu in the rotational direction and at the backward position, and the magnetic sheet 2 is sandwiched between these opposing surfaces and the magnetic head 3. It rotates in a circular motion. However, although the provision of this stabilizing member 1 is very effective for stable running of the magnetic sheet 2, the opposing surface is the back surface of the magnetic sheet 2, and the outer peripheral part is the inner peripheral part of the magnetic sheet 2 which is restrained. Surface runout is more likely to occur than in other parts. Therefore, the amount of protrusion of the magnetic head 3 to obtain the optimum output is slightly different between the inner and outer circumferential sides of the magnetic sheet 2, and the magnetic head 3 is set to obtain the optimum output at the center of the magnetic sheet 2. Then, the optimum output cannot be obtained on the inner and outer circumferential sides of the magnetic sheet 2,
Furthermore, when trying to improve the average output from the inner circumference to the outer circumference of the magnetic sheet 2, a problem arises in that the positioning allowance of the magnetic head becomes narrower.

(Problems to be Solved by the Invention) As described above, the magnetic sheet is easily scratched, and the outer periphery of the magnetic sheet is particularly prone to surface runout, making head touch unstable.

Therefore, the present invention aims to provide a flexible structure that prevents scratches on the magnetic sheet, suppresses surface runout at the outer periphery of the magnetic sheet, and allows stable recording and reproduction at both the inner and outer periphery of the magnetic sheet. An object of the present invention is to provide a magnetic sheet recording and reproducing device.

[Structure of the invention]

(Means for Solving the Problems) In the flexible magnetic sheet recording and reproducing device of the present invention, a regulating member is provided on the outer circumferential side of the magnetic sheet than the stabilizing member in parallel to the rotating direction of the magnetic sheet. is configured to be lowered than the stabilizing member so as to press the outer periphery of the magnetic sheet over a wide area.

(Function) A magnetic sheet rotating with its center restrained has a relatively stable rotating state on the inner circumference side, but surface runout is more likely to occur as it moves toward the outer circumference. In particular, the vibration at the outermost periphery is quite large, and even if a stabilizing member is provided, no significant effect of +g can be seen. On the other hand, the stabilizing member may also generate positive light.

Therefore, by providing the regulating member of the present invention, the outer periphery can be pressed more strongly over a wide range to suppress the surface runout of the outer periphery, and since the amount of pushing of the stabilizing member on the inner periphery side can be reduced, the occurrence of scratches can also be prevented. It is possible.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a general view of a stabilizing member and regulating member according to an embodiment of the present invention, and FIG. 2 is a 11111 side view of a flexible magnetic sheet recording and reproducing apparatus according to an embodiment of the present invention. , FIG. 3 is a bottom view of a stabilizing member and a regulating member according to an embodiment of the present invention.

In FIGS. 1, 2, and 3, the stabilizing member 1 for obtaining stable contact between the magnetic sheet 2 and the magnetic head 3 during high-speed rotation is centered at the position of the magnetic head 3.
It has a pair of opposing surfaces, an upstream stabilizing part 1a and a downstream stabilizing part 1b, which face the magnetic sheet 2 at positions near the front side and the rear side in the rotational direction of the magnetic sheet 2. This stabilizing member 1 has a magnetic head 3 with respect to a magnetic sheet 2.
It is attached to the main body 1o so as to be in sliding contact with the opposite side of the main body 1o.

At this time, the longitudinal direction of the stabilizing member l coincides with the radial direction of the magnetic sheet 2.

On the other hand, a regulating member 8 is disposed perpendicular to the longitudinal direction of the stabilizing member 1 (parallel to the traveling direction of the magnetic sheet 2) and attached to the stabilizing member 1. Since the regulation member 8 is attached so as to come into contact with the outer circumferential portion of the magnetic sheet 2 and protrude from the stabilizing member 1, the outer circumferential portion of the magnetic sheet 2 is further suppressed.

Here, when the regulating member 8 and the stabilizing member 1 are pressed to the same height with respect to the magnetic sheet 2), the drag force of the magnetic sheet 2 against the stabilizing member 1 and the regulating member 8 is distributed as shown in FIG. become. Distribution A in the figure shows the magnetic head 3 protruding at a position within the radius of 14.9 from the center of the innermost track of the magnetic sheet 2, and distribution B represents the center radius of the outermost track of 2.
It shows the drag force when the magnetic head 3 is projected to a position of 0+m. Common to distributions A and B, the protruding position of the magnetic head 3, the upstream stabilizing part 1a and the downstream stabilizing part 1b
Stress concentration occurs at the contact position on the innermost track of the magnetic sheet 2, and particularly in distribution A where the magnetic head 3 protrudes to the innermost track position, the peak value of the drag force is quite large. When the magnetic sheet 2 is actually rotated, the position of the magnetic sheet 2 where stress concentration occurs matches the position of the scratches that occur on the back side of the magnetic sheet 2. Therefore, as a measure to remove scratches, magnetic It is necessary to make the sheet drag distribution uniform.

Therefore, when the regulating member 8 is lowered by a certain height from the stabilizing member 1 with respect to the magnetic sheet 2, the magnetic sheet drag distribution becomes as shown in FIG. FIG. 5 corresponds to FIG. 4 and has the same scale. Distribution AI places the magnetic head 3 at a position with a center radius of 14.9+m on the innermost track, and distribution B' places the magnetic head 3 at a position with a center radius of 20IIIIII on the outermost track. It is something that stands out. As can be seen from FIG. 5, even if the magnetic head 3 is protruded regardless of the protruding position of the magnetic heel 3, the large stress concentration as shown in FIG. 4 does not occur. As a result, scratches on the back surface of the magnetic sheet 2 are less likely to occur. Also,
The relative difference between the peak of distribution A1 and the peak of distribution 131 in FIG. 5 is smaller than the relative difference between the peak of distribution A and the peak of distribution B in FIG. In other words, when the protrusion amount of the magnetic head on the inner and outer peripheries of the magnetic sheet is the same, the peak value of the magnetic sheet drag force against the magnetic head 3 is almost the same.

In connection with this, when the regulating member 8 and the stabilizing member l are at the same height, FIG. Shown below. The optimum protrusion amount differs depending on the position of the magnetic head 3. This means that when the magnetic sheet 2 is rotated, the magnetic sheet 2
Surface runout is likely to occur on the outer circumferential side of the magnetic sheet 2, so in order to obtain a stable output, the magnetic head 3 must be slightly raised on the outer circumferential side of the magnetic sheet 2 than on the inner circumferential side of the magnetic sheet 2 due to the spacing. It means that. FIG. 7 shows the optimum amount of protrusion of the magnetic head 3 when the regulating member 8 is lowered to a certain extent. This means that the amount of protrusion of the magnetic head 3 to obtain the optimum output envelope is approximately one foot regardless of the position of the magnetic sheet 2 in the radial direction. This also increases the allowance for the overall amount of magnetic head protrusion.

In this way, the regulating member 8 having a surface parallel to the rotational direction of the magnetic sheet 2 is lowered relative to the stabilizing member 1 to press down the outer peripheral portion of the magnetic sheet 2, so that the sheet resistance is made uniform. In particular, since the outer periphery of the magnetic sheet 2 is held down over a wide range by the regulating member 8, surface runout of the outer periphery is suppressed. Since the sheet drag force is made uniform and no extreme stress concentration occurs, the magnetic sheet 2 will not be scratched, its life will be extended, and the head touch will be extremely stable regardless of whether it is on the inner or outer periphery of the magnetic sheet 2. Furthermore, since the protrusion conditions of the magnetic head 3 are approximately the same on both the inner and outer peripheries of the magnetic sheet 2, stable output can be obtained.

Furthermore, since the amount of pressing of the stabilizing member 1 is reduced, the friction loss with the magnetic sheet 2 is reduced, and the torque required as a rotational drive source is small, making it possible to use small, lightweight, and low power consumption devices such as electronic still cameras. This is advantageous for required equipment, and because it suppresses surface runout, it is also advantageous for vibrations, etc.

Next, other embodiments of the present invention will be described with reference to FIGS. 8 to 10.

a! 8 and 9, the regulating member 8 is attached to the stabilizing member No. 1 so as to be movable up and down. Stabilizing member 1
A support shaft 13 is installed on the upper gIC and one end of the plate spring 12 is fixed. The other end of the plate spring 12 is fixed to the regulating member 8. The regulating member 8 is provided with a hole 15 and is attached to the stabilizing member 1 with a screw 14 so as to be movable up and down. Also, there is a slight V in the leaf spring 12! 4u screw] 1 is provided, the height of the regulating member 8 is finely adjusted by tightening or loosening the screw 11, and then the screw 14 is tightened to fix it.

If the regulating member 8 protrudes too much, the deformation of the magnetic sheet 2 will be large and the flat touch will deteriorate, but if the amount of protrusion is too small, the effect of the present invention cannot be obtained, and the protrusion amount is preferably about 200 μm.

However, if the adjustment mechanism is simplified so that it can be easily adjusted outside the main body 10 (for example, the operator can arbitrarily adjust the amount of protrusion using an adjustment dial provided on the main body 10), it is possible to use it. The optimum output can be easily obtained when the magnetic sheet 2 is deformed.

In addition, FIG. 10 shows an example in which the sliding surface of the regulating member 8 with respect to the magnetic sheet 2 is sloped so that the regulating member 8 reliably contacts the magnetic sheet 2, and FIG. The stabilizing parts 1a, Ib and the regulating member 8 are integrally formed.

〔Effect of the invention〕

As described in detail above, according to the present invention, the sheet drag force is made uniform to prevent the occurrence of scratches, and the surface runout at the outer periphery of the magnetic sheet is suppressed, resulting in stable recording regardless of the inner or outer periphery of the magnetic sheet. Can be played.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a stabilizing member and a regulating member according to an embodiment of the present invention, and FIG. 2 is a side sectional view showing a part of a flexible magnetic sheet recording/reproducing apparatus of the present invention. Figure 3 is a bottom view of Figure 1, Figure 4 is a sheet drag distribution diagram when the regulating member is at the same height as the stabilizing member, and Figure 5 is a diagram showing the distribution of sheet drag when the regulating member is at a certain height than the stabilizing member. Fig. 6 is a diagram showing the optimum protrusion amount of the magnetic head when the regulating member is at the same height as the stabilizing member, and Fig. 7 is a diagram showing the optimum protrusion amount of the magnetic head when the regulating member is at the same height as the stabilizing member. Diagrams showing the optimum protrusion amount of the magnetic head when the magnetic head is lowered by a certain height from the stabilizing member, Figures 8 to 11
The figures are a diagram and a partially sectional side view showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Stabilizing member, 2 river magnetic sheets, 3... Magnetic head, 8... Regulation member, 11... Fine f4 adjustment screw. Agent Patent attorney Nori Chika Ken Yudo Take Hana Hisukuo $1 diagram 2 Figure 3 Figure Ja 扼 Sheet half Q (rnm) roll 4 Figure λ 4 Sheet manual moxibustion (m nail) 5 Figure 4 Qi To, Bi, 71 protrusion amount (P claw) Return amount of extremely het' CP claw)

Claims (3)

[Claims] (1) A magnetic head that comes into contact with one side of a rotationally driven flexible magnetic sheet to record and reproduce signals, and a magnetic head that comes into contact with the other side of the magnetic sheet opposite to this magnetic head to In a flexible magnetic sheet recording and reproducing device having a stabilizing member for pressing the sheet against the magnetic head, a regulating member is provided attached to the stabilizing member and abuts on the outer periphery of the other surface of the magnetic sheet, A flexible magnetic sheet recording/reproducing device characterized in that the regulating member presses the outer circumferential portion of the magnetic sheet more strongly than the inner circumferential portion. (2) The flexible magnetic sheet recording and reproducing apparatus according to claim 1, wherein the regulating member is provided so as to be movable up and down with respect to the magnetic sheet. (3) The flexible magnetic sheet recording/reproducing device according to claim 1, wherein the stabilizing member and the regulating member are integrally formed.