JPS6111966A - Recording and reproducing deviced for rotary magnetic sheet - Google Patents

Abstract

PURPOSE:To prevent a magnetic sheet from having a flaw while running by forming a stabilizing member into a conic rotating body which coincides with respective peripheral speeds at respective radial positions on the magnetic sheet. CONSTITUTION:Stabilizing members 6a and 6b are fitted to the magnetic sheet 4 through bearings 7a and 7b in sliding contact with the opposite surface of a magnetic head 5. At this time, the axes of center of the truncated conic bodies 6a and 6b of rotation meet each other on the center axes of a center hub 7. Those conic bodies are increased in diameter from the internal diameter side of the sheet to the external diameter side so that peripheral speeds at respective sliding contact parts almost coincide with those on the abutting sheet in the radial direction of the sheet.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a rotating magnetic sheet recording and reproducing device that records and reproduces signals by rotating a flexible magnetic sheet and bringing a magnetic head into contact with the flexible magnetic sheet.

[Technical background of the invention and its problems]

2. Description of the Related Art In recent years, so-called electronic cameras that capture an image using a solid-state image sensor or the like and record it in a memory as a still image have been attracting attention. In this electronic camera, a flexible magnetic sheet is generally used as an image memory. Magnetic sheets have a larger storage capacity than semiconductor materials, but in response to demands for improved image quality and smaller size electronic cameras, it is desirable for magnetic sheets to have a high 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. 5 shows the basic configuration of such a rotating magnetic sheet recording/reproducing device. A magnetic sheet jacket 3, which is made up of a magnetic sheet 4 housed in a flat package 2, is set on the center hub 1, and When attached to the main body of a recording/reproducing device that does not operate, the magnetic head 5 provided on the main body becomes a magnetic sheet)
4. Note that FIG. 6 is a cross-sectional view taken along line XX in a direction perpendicular to the direction of movement (tracking direction) of the magnetic head 5, and FIG. 7 is a cross-sectional view taken along line Y-X along the direction of movement.

By the way, for electronic cameras and the like, the package 2 is formed into a very small size with a side of about 5 cIIL because of the requirement for a smaller loading capacity and the ease of handling of the magnetic sheet jacket 4. The stored magnetic sheet 4 also has an extremely small shape with a diameter of only 4 cILg degrees. When the shapes of the package 2 and the magnetic sheet 4 become smaller in this way, the air between the magnetic sheet 4 and the package 2 induced by the rotation of the magnetic sheet within the package 2, which contributes to the stable rotation of the magnetic sheet 30, is reduced. The laminar flow effect and the centrifugal force of the magnetic sheet 4 itself cannot be sufficiently obtained. In this state, when an attempt is made to bring the magnetic head 5 into contact with the recording surface of the magnetic sheet 4, the magnetic sheet 4 tends to escape to the opposite side of the magnetic head 5, making the sliding contact state extremely unstable. It ends up. Therefore, spacing loss is unlikely to occur.
In order to solve the problem of reducing the size of the package and magnetic sheet, such as making stable recording and playback impossible, we installed a stabilizing member on the opposite side of the magnetic sheet from the magnetic head. A type with K is proposed to stabilize running.

This stabilizing member has a pair of opposing surfaces that face each other magnetically at positions near the front and rear sides in the direction of rotation of the magnetic sheet with the position of the magnetic head as the center, and the magnetic sheet has magnetic contact with these opposing surfaces. It rotates while being sandwiched between it and the head. However, although providing this stabilizing member is very effective for stable running of the magnetic sheet, the opposing surface may come into contact with the back surface of the magnetic sheet, causing the magnetic sheet to
C. There is a problem in that it causes scratches during running. These running scratches increase with the passage of time, causing dropouts, non-uniform reproduction output envelopes, etc., significantly deteriorating the recording/reproducing characteristics, and shortening the life of the sheet.

[Purpose of the invention]

The present invention has been made in order to solve the above problems, and provides a rotating magnetic sheet recording/reproducing device that can bring a magnetic sheet into contact with a magnetic head in an optimal state and obtain good recording/reproducing characteristics. The purpose is to

[Summary of the invention]

That is, the present invention includes a flat package, a flexible magnetic sheet that is rotationally driven within the package, and this magnetic sheet II? : A magnetic head that contacts this magnetic head to record/reproduce signals, and a magnetic head that contacts this magnetic sheet to record/reproduce signals.The magnetic head and this magnetic head, the rotation of the magnetic sheet around the position of the magnetic head. In a rotating magnetic sheet recording/reproducing device comprising a stabilizing member for stabilizing the rotation of a magnetic sheet, the magnetic sheet has a pair of opposing surfaces facing the magnetic sheet at positions near the front side and the rear side in the direction. The stabilizing member also rotates when driven, and further, the rotating body has a conical or truncated conical shape such that the circumferential speed at each position of the magnetic sheet in the magnetic head movement direction matches the circumferential speed at that position of the rotating body stabilizing member, The rotating magnetic sheet recording and reproducing device is characterized in that the rotation center axis of the rotating body of the stabilizing member is oriented toward a center hub (the center point of the magnetic sheet).

〔Effect of the invention〕

According to the present invention, the following effects can be obtained.

(1) Since the stabilizing member is a conical rotating body, there is no gap between the magnetic sheet and the stabilizing member, and the sheet is not scratched while running. Therefore, the life of the magnetic sheet can be extended.

(2) Since the magnetic sheet is a circular conical body in which the circumferential speed at each position in the radial direction matches the circumferential speed of the rotating body stabilizing member, friction loss is small and it can be used as a rotational drive source for the magnetic sheet. Another advantage is that the torque of the motor is small. Therefore, the motor can be miniaturized and the drive power source can also be of small capacity, which is particularly advantageous for devices such as electronic cameras that require small size, light weight, and low power consumption.

(3) When the stabilizing member rotates, the button functions to remove heat generated by friction between the magnetic sheet and the magnetic head or the plate of the package.

(4) Since no friction occurs in the rolling element stabilizing member, the cleanliness of the magnetic sheet is improved.

(5) Since the rotating body stabilizing member has a conical shape, the area in which it slides into contact with the back surface of the magnetic sheet becomes wider from the inner circumferential side to the outer circumferential side of the magnetic sheet, which tends to cause surface run-out and cause instability of the cine. By suppressing the outer periphery of the magnetic sheet, stable sliding contact between the magnetic head and the magnetic sheet can be achieved.

[Embodiments of the invention]

FIG. 1 shows a side view of a rotating magnetic sheet recording/reproducing apparatus according to an embodiment of the present invention, FIG. 2 shows a front view thereof, and FIG. 3 shows a perspective view of a truncated conical rotating body stabilizing member.

The stabilizing members 6a and 5b are attached so as to be in sliding contact with opposite surfaces of the magnetic head 5 and the 4K magnetic head 5 by means of bearings 7a and 7b. At this time, the truncated conical rotating bodies 6a and 6b are mounted so that their central rotational axes are concentrated on the central axis of the center hub 7. The size of this conical shape is determined by increasing the radius from the inner diameter side of the seat toward the outer diameter side so that the circumferential speed of each sliding contact part approximately matches the circumferential speed of the seat in contact with the seat in the radial direction KG. .

FIG. 4 shows the structure of a main part of a rotating magnetic sheet recording/reproducing apparatus according to an embodiment of the present invention.

In the figure, 3 is, for example, a rectangular flat package made of a synthetic resin material with a side length of about 5 mm;
A flexible magnetic sheet 4 having a thickness of approximately 100 μm is housed within this package 3, forming a so-called magnetic sheet jacket.

The magnetic sheet 4 is connected at its center to a drive motor (not shown) and is driven to rotate. Holes 3a are formed in the package 3 along the radial direction.

The magnetic head 5 is inserted into this hole 3a from the bottom side as shown in the figure.
The tip thereof is in contact with the magnetic surface of the magnetic sheet 4. This magnetic head 5 is provided so as to be movable in the radial direction of the magnetic sheet 4. On the other hand, above the elongated hole 3a, a stabilizing member 6 having the structure shown in FIG. 2 based on the present invention is arranged so as to sandwich the magnetic sheet 4 and face the magnetic head '5.

The stabilizing member 6 is placed at a position near the front side and the rear side in the direction of rotation of the magnetic sheet 4 with the position of the magnetic head 5 as the center.

In this case, a pivot bearing or the like is used in the stabilizing member of the conical rotating body to achieve smooth rotation.

[Other embodiments of the invention]

In the embodiments shown in FIGS. 2 and 4, the sliding contact portion of the stabilizing member 6 with the magnetic sheet 4 coincides with or is parallel to the virtual plane of the magnetic sheet, but the rigidity of the sheet, etc. For example, the outer circumferential side of the seat may be pressed against the head side more than the inner circumferential side, and the posture may be favorable for unbalanced seating.

It is also possible for the stabilizing elements to have mutually different average diameters. As described above, various modifications can be made without departing from the spirit of the present invention.

[Brief explanation of drawings]

FIG. 1 is a partially sectional side view showing the configuration of a rotating magnetic sheet recording and reproducing apparatus of the present invention, FIG. 2 is a front view of FIG. 1, and FIG. 3 is a perspective view of a conical rotating body stabilizing member of the present invention. 4 is a side view of a rotating magnetic sheet recording/reproducing device showing one embodiment of the present invention, seen from the moving direction of the magnetic head. FIG. 5 is a top view showing a conventional rotating magnetic sheet recording/playing device. Figure 6 is the x-, :xvR plane view of Figure 5, and Figure 7 is the Y-Y view of Figure 5.
FIG. 1... Center hub, 2... Jacket, 3...
...Package, 3a... Hole in package, 4... Magnetic sheet, 5... Magnetic head. 6... Rotating body stabilizing member, 6a... Upstream stabilizing member, 6b... Downstream stabilizing member, 7a... Upstream stabilizing member bearing part,
7b...Downstream stabilizing member bearing island agent Patent attorney
Noriyuki Chika (and 1 other person) Figure 1 S Figure 2 Figure 3 Figure 4

Claims (2)

[Claims] (1) A flat package, a flexible magnetic sheet that is rotationally driven within this package, a magnetic head that records/reproduces signals by contacting the magnetic sheet, and a magnetic head that faces the magnetic head with the magnetic head in between. The magnetic sheet is provided to stabilize the rotation of the magnetic sheet, and has a pair of opposing surfaces facing the magnetic head at positions near the front side and the rear side in the rotational direction of the magnetic sheet with the position of the magnetic head as the center. In the rotating magnetic recording/reproducing device, the stabilizing member rotates when the magnetic sheet is driven to rotate, and further, the circumferential velocity at each position in the radial direction of the magnetic sheet is determined by the rotation of the stabilizing member. A rotating magnetic sheet recording/reproducing device characterized by having a conical or truncated conical shape that substantially matches the circumferential speed of the body. (2) The rotating magnetic sheet recording/reproducing device according to claim 1, wherein the rotation center axis of the rotating body of the stabilizing member is oriented toward the center hub.