JPH0762938B2 - Recording or reproducing device having a stabilizing member - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording or reproducing apparatus using a flexible record carrier, and more particularly, to a recording or reproducing head utilizing an air flow caused by rotation of the record carrier. The present invention relates to a recording or reproducing device having a stabilizing member that stabilizes a sliding contact state.

(Prior Art) In a recording or reproducing apparatus of the type described above, a recording or reproducing head, for example, a record carrier on which a magnetic head rotates at high speed,
For example, recording or reproduction is performed in a state of sliding contact with a magnetic disk, but it is difficult to maintain a stable and good sliding contact state between the head and the disk due to the air flow generated by the rotation of the disk. There arises a problem that the characteristics are deteriorated.

Therefore, as shown in FIGS. 4 and 5, a stabilizing member is provided on the side opposite to the head with respect to the disk so that the air flow generated by the high speed rotation of the disk is not only generated between the head and the disk but also the stabilizing member and the disk. It has also been attempted to maintain the sliding contact state between the head and the disk in a stable and favorable manner by also causing the gap between the head and the disk.

In FIGS. 4 and 5, 1 is the magnetic disk,
2 is a plastic cetane core attached to the center of the disk 1, 3 is a disk rotation motor, and the center hole 2a of the center core 2 is mounted on a spindle 3a coupled to the motor 3, and the disk 1 is, for example, A predetermined speed in the direction A in the figure (in a still image recording or reproducing device, for example
Rotate at 3600 rpm). The magnetic head 4 is supported by the head moving base 7 and is moved by the head moving base 7 in the radial direction of the disk 1 (direction of arrow B in FIG. 4). As a result, at the time of signal recording, the head 4 forms concentric or spiral recording tracks on the recording surface of the disk 1.

Reference numeral 15 is the above-mentioned stabilizing member, and the disk 1 is provided so as to face the head 4 while sandwiching it, and a concave groove portion 15c having a rectangular cross section is provided with a constant opening width according to the movement of the head 4 in the direction of arrow B. There is. The concave groove portion 15c is for avoiding a collision with the head 4, and the facing surface of the stabilizing member 15 and the disk 1 is formed with an upstream facing surface 15a and a downstream facing surface 15b with the concave groove portion 15c as a boundary. Divided. Reference numeral 6 denotes a back plate which is provided as necessary and has a long hole 6a, and the head 4 is provided so as to project to the disk 1 side through the long hole 6a.

In the above structure, the stabilizing member 15 closely faces the recording surface of the disk 1 opposite to the recording surface of the disk 1 as shown in FIG. 5, and the tip of the head 4 is located in the concave groove portion 15c of the stabilizing member 15. It slightly protrudes, or protrudes from the recording surface of the disk 1 so as to be in sliding contact with the recording surface of the disk 1 so as to be at the same level as the facing surfaces 15a and 15b, and the back plate 6 is a stabilizing member.
It is in a state of facing the recording surface of the disc 1 with a distance larger than 15.

(Problems to be Solved by the Invention) In the above apparatus, when the disk 1 rotates in the direction of arrow A, the disk 1 and the head 4 are in sliding contact with each other. Including the state of facing each other with the air flow of.
Since a positive pressure is generated between the disk 1 and the upstream facing surface 15a of the stabilizing member 15 due to the influence of the air flow accompanying the rotation of the disk 1, the disk 1 is pushed down at this portion and the other disk 1 faces the downstream side. Since a negative pressure is generated between the disk 1 and the surface 15b, the disk 1 is attracted to the stabilizing member 15 side against its rigidity. As a result, as shown in FIG. 5, the disk 1 easily contacts the downstream facing surface 15b, and when both contact, the stable sliding contact state between the head 4 and the disk 1 is hindered. Further, an abrasive (for example, SiO ₂ , TiO ₂ ) contained in the binder in the magnetic layer of the magnetic disk 1 scratches the downstream facing surface 15b, and is peeled from the disk 1 by contact with the stabilizing member 15 and released. Stabilizer for abrasives 15
May be attracted to the damaged part of the disk and deteriorate its surface condition, which may give an abnormal load to the disk rotation motor 3 and hinder the normal operation of the servo mechanism. Further, the abrasive adsorbed on the stabilizing member 15 further promotes the exfoliation of the abrasive contained in the binder in the magnetic layer of the disk 1, and it is circulated in the vicinity of the head 4 to cause a serious wear. To do. These phenomena are due to the contact between the disc 1 and the stabilizing member 15 due to the negative pressure generated on the downstream facing surface 15b of the stabilizing member when the disc 1 is rotating at a high speed.

As a separate problem associated with the high-speed rotation of the disc 1, the disc 1 is projected on the upper side of the disc 1, that is, on the side of the stabilizing member 15 as shown by 1a in FIGS. 6 (A) and 6 (B). In addition, the disk 1 is deformed so as to widen from the outer circumference toward the center. this is,
This is the influence of the center core 2 provided at the center of the disk 1. The above-mentioned deformed state is a case where the head 4 is in a position corresponding to substantially the center of the recording area on the disk 1 shown by 4'in FIG. 6 (A).
Regardless of the radial position of the disk 1, the disk 1 exhibits a similar tendency of deformation when rotating at high speed. Considering the above-mentioned deformation of the disk 1, the negative pressure generation state between the stabilizing member 15 and the stable member 15 at the time of high speed rotation of the disk 1 has a more complicated appearance, so that the negative pressure generation is prevented. The means to do this is extremely important.

The present applicant has previously proposed a recording or reproducing apparatus in which an inclined surface for generating a positive pressure is provided on the downstream side of the stabilizing member in the rotating direction of the record carrier in proximity to the concave groove portion (Japanese Utility Model Application No. 60- 3563
8, Japanese Patent Application No. 60-35649), the present invention is an improvement of the above-mentioned proposal, and in the recording or reproducing apparatus having a stabilizing member by setting the shape of the inclined surface, a recording or reproducing head and a flexible record carrier. It is intended to realize a more stable sliding contact state with.

Therefore, the present invention comprises a recording or reproducing head that is movable in the radial direction of a flexible record carrier, and a stabilizing member that has a concave groove portion that is provided so as to face the head while sandwiching the record carrier. Alternatively, in the reproducing apparatus, the record carrier is rotated without contact with the stabilizing member, and the recording carrier is rotated without unevenness in rotation, and the sliding contact state between the recording or reproducing head and the rotating record carrier is stabilized. The purpose is to provide a means capable of.

(Means for Solving the Problems) In order to achieve the above object, a recording or reproducing apparatus having a stabilizing member of the present invention comprises a recording or reproducing head movable in a radial direction of a flexible record carrier, and the recording apparatus. A stabilizing member having a recessed groove portion provided so as to face the recording or reproducing head with the carrier sandwiched therebetween, wherein the stabilizing member has the recessed groove portion on the downstream side in the rotation direction of the recording carrier with respect to the recessed groove portion. A slope for generating a positive pressure whose inclination angle changes in the moving direction of the head is provided in the vicinity of, and the groove width of the concave groove portion of the stabilizing member becomes closer to the inner radial side of the record carrier. It is formed to be wide.

(Embodiment) An embodiment of the recording or reproducing apparatus of the present invention will be described in detail below with reference to FIGS. The following description will be given in the order of one embodiment of the recording or reproducing apparatus of the present invention and other embodiments for an example of using a flexible magnetic disk as a record carrier.

(One embodiment of the recording or reproducing apparatus of the present invention) (Fig. 1,
FIG. 2) FIG. 1 shows an embodiment of the recording or reproducing apparatus of the present invention, and FIG. 1A is a longitudinal sectional view showing the relationship between the stabilizing member, the record carrier and the recording or reproducing head in the embodiment. FIG. 3B is a perspective view showing the stabilizer plate in FIG. In these figures, 1,4,6,6a and 7 respectively represent a magnetic disk as a flexible record carrier, a magnetic head as a recording or reproducing head, a back plate, which are the same as those described with reference to FIG. The long hole and the head moving base are basically the same in construction and function as the conventional one shown in FIG. 4 and are well known per se, and therefore detailed description thereof will be omitted.

Reference numeral 5 denotes a stabilizing member whose interaction with the rotating magnetic disk 1 embodies the main feature of the present invention, and the surface facing the disk 1 is provided with a concave groove 5c for head escape. The disc is divided into an upstream facing surface 5a and a downstream facing surface 5b in the rotating direction of the disk 1 (A in FIG. 1A) with the groove 5c as a boundary. On the downstream facing surface 5b,
A slope 5d for generating a positive pressure is provided in the vicinity of the concave groove portion 5c (adjacent to the concave groove portion 5c in FIG. 1B). 5e is a groove
It is a ridgeline on the downstream side of 5c and a ridgeline on the concave groove portion 5c side of the slope 5d, and 5f is a ridgeline on the downstream side of the slope 5d. Of these, the height h1 of the ridgeline 5f from the downstream facing surface 5b is constant, but the concave groove portion 5c of the ridgeline 5e (in this example, the concave groove portion 5c and the facing surface 5b).
And the same level, but the two levels may be different). The height h2 from the arrow C in FIG.
It gradually becomes higher continuously or stepwise in the direction (direction of the center core). That is, the slope 5d is inclined in the direction of arrow C as shown in FIG.
Is formed to be gradually smaller, and has a twisted shape as a whole.

The inclination angle θ is required in the traveling direction of the disc 1 in order to generate a required positive pressure between the slope 5d and a portion of the disc 1 that passes through the slope when the disc 1 rotates in the arrow direction. It is set to make an acute angle. That is,
It is determined based on the deformed shape of the portion of the disk 1 passing through the slope 5d so as to form an acute angle at which a required positive pressure is obtained at a predetermined rotation speed of the disk 1.

In FIG. 1, the slope 5d is formed adjacent to the groove 5c, but a slope similar to the above may be provided at a position slightly downstream of the ridgeline 5c of the groove.

Further, the sliding contact position between the head 4 and the disk 1 can be set substantially at the center between the ridgeline 5g of the upstream facing surface 5a and the ridgeline 5f of the sloped surface 5d, and does not coincide with the center of the concave groove portion 5c. This is because the shape and the length are suitable for generating the required positive pressure between the slope 5d on the downstream side and the disk 1.

Next, the operation based on the above configuration will be described. When the disk 1 and the head 4 are in sliding contact with each other, a positive pressure is originally generated between the disk 1 and the disk 1 and the upstream facing surface 5a of the stabilizing member during high speed rotation. Then, the disc 1 is pushed downward in FIG. 1 (A). On the other hand, when the disk 1 rotates at a high speed, a positive pressure is generated between the slope 5d and the disk 1 while the head 4 projects toward the groove 5c, which causes the disk 1 to face the downstream side facing surface 5b in FIG. Receives pressure in the direction of being pushed downwards away from. The positive pressure generated on the slope 5d is determined by the shape of the gap S between the disk 1 and the slope 5d. FIG. 2 shows a relative inclination state of the disc 1 and the slope 5d when the disc 1 rotates at a high speed, and FIG. 2 (A) shows the vicinity of the outer periphery of the disc 1, FIG.
Shows the state of the inner peripheral side of the disk 1. Disk 1
Due to the influence of the center core, the angle γ formed by the horizontal plane is smaller on the inner peripheral side γ ₂ than on the outer peripheral side γ ₁ . On the other hand, the inclination angle θ of the inclined surface 5d becomes smaller from the outer circumference to the inner circumference of the disk 1, and therefore θ _{1 in} FIG.
Θ ₂ is smaller than that of Therefore disk 1
The shape of the gap S between the inclined surface 5d and the slope 5d is substantially constant from the outer peripheral side to the inner peripheral side of the disk 1. Here, the positive pressure generated in the gap S formed by the disk 1 and the slope 5d depends on the rate of change of the gap S in the direction A in FIG. 2, and the rate of change is almost zero, that is, the slope 5d. And the disk 1 rotating at high speed are nearly parallel to each other, but the positive pressure generated when there is a slight opening angle between them becomes maximum, and
The larger the rate of change in direction, that is, the larger the opening angle between the inclined surface 5d and the disk 1 rotating at high speed than in the above state, the smaller the positive pressure generated. Therefore, according to the configuration of the slant surface 5d shown in FIG. 1, the slant surface 5d has an inclination angle that matches the deformed shape of the disk 1 during high-speed rotation in any cross section along the C direction in the figure. Therefore, the change rate of the gap S in the A direction can be set so that the pressure distribution of the positive pressure generated in the gap S from the outer peripheral side to the inner peripheral side of the disk 1 is substantially uniform and a large positive pressure is generated. it can.

For the above reason, the positive pressure generated by providing the inclined surface 5d having the above-described configuration is almost uniform along the C direction in FIG. 1 (B) with almost no decrease on the inner peripheral side of the disk 1. Since the pressure distribution is high, the disk 1 is effectively pushed down in the direction away from the downstream facing surface 5b, and there is no possibility of contact with the stabilizing member 5, and the head 4 and the disk 1
The sliding contact state with the disk 1 becomes extremely good, and uneven rotation caused by the contact of the disk 1 with the stabilizing member 5 can be suppressed.

(Other Embodiments of Recording / Reproducing Apparatus of the Present Invention) (Third Embodiment)
FIG. 3 is a perspective view showing a stabilizing member in an upside down state in another embodiment of the recording or reproducing apparatus of the present invention. In this embodiment, the relative positions of the disk 1 and the head 4 are It is almost the same as that shown in FIG. In the embodiment of FIG. 1, the concave groove portion 5c for head escape is rectangular, but in the embodiment of FIG. 3, the concave groove portion 5'c has a trapezoidal shape whose width gradually increases in the direction C in the drawing. Is doing. Since the disk 1 is deformed as shown in FIG. 6 when it is rotated at a high speed, the disk 1 rotating facing the inclined surface 5′d has an angle (γ) formed with the horizontal plane on the inner peripheral side rather than the outer peripheral side. Since it is smaller, the effect of the embodiment of FIG. 3 is greater from the viewpoint of making the pressure distribution along the direction C in FIG. 3 substantially constant.

The applicant of the present application has previously proposed that when the flexible record carrier is in a rotating state, a concave part provided on the downstream side of a central concave part for head escape and a convex part divided by this concave part In the state, a recording or reproducing apparatus having a shape sufficient to generate a positive pressure with the record carrier, for example, a recording or reproducing apparatus having an inclined surface facing the downstream side was proposed (Japanese Patent Application No. 60-5302).
8), The structure of the slope 5d in the stabilizing member of the present invention can be applied to a part or all of the convex portion of the recording or reproducing device.

Further, the applicant has found that the width of the opening of the recess for the head escape is larger on the rotation center side than on the rotation outer peripheral side of the record carrier, and the recess provided on the downstream side of the recess is We have proposed a recording or reproducing device having a convex portion divided by a concave portion and having a shape sufficient to generate a positive pressure between the convex portion and the record carrier in a rotating state of the record carrier, for example, an inclined surface facing the downstream side. Japanese Patent Application No. 60-56188), the structure of the slopes 5d and 5'd in the stabilizing member of the present invention is such that one of the convex portion adjacent to the concave portion for the head escape of the recording or reproducing apparatus and the convex portion on the further downstream side. It can be applied to all or part.

(Effects of the Invention) As described above, according to the present invention, in accordance with the deformed shape of the record carrier at the time of high-speed rotation, the normal direction generated between the slope and the record carrier over the entire moving direction of the head. Since the pressure distribution of the pressure can be made substantially uniform and the generated pressure hardly decreases on the inner peripheral side of the record carrier, the record carrier can be stably held without contacting the stabilizing member.
In addition, it can be rotated without uneven rotation, and the sliding contact state between the recording or reproducing head and the rotating record carrier can be stabilized.

[Brief description of drawings]

FIG. 1 (A) is a sectional view showing a main part of an embodiment of a recording or reproducing apparatus of the present invention, and FIG. 1 (B) is a perspective view showing the stabilizing member in FIG. 2 (A) and 2 (B) are enlarged explanatory views showing the relative inclination state between the stabilizing member and the rotary record carrier in the embodiment of FIG. 1, and FIG. 3 is the recording or reproducing apparatus of the present invention. FIG. 4 is a perspective view showing a stabilizing member upside down in another embodiment of the present invention, and FIGS. 4 and 5 are exploded perspective views and sectional views showing essential parts of a conventional recording or reproducing apparatus, respectively, and FIG. 6A and 6B are respectively a plan view and a perspective view schematically showing a deformed state of the flexible record carrier during rotation in a recording or reproducing device using the flexible record carrier. DESCRIPTION OF SYMBOLS 1: Magnetic disk as record carrier, 2: Center core, 4: Magnetic head as recording or reproducing head, 5, 5 ': Stabilizing member, 5c, 5'c: Recessed groove portion in stabilizing member, 5d, 5′d: Slope in stabilizing member.

Claims (1)

[Claims] 1. A recording or reproducing head which is movable in a radial direction of a flexible record carrier, and a stabilizing member having a concave groove portion which is provided so as to face the recording or reproducing head while sandwiching the record carrier. The stabilizing member is provided with an inclined surface for generating a positive pressure whose inclination angle changes in the moving direction of the head, in the vicinity of the concave groove portion on the downstream side in the rotation direction of the record carrier with respect to the concave groove portion, The recording / reproducing apparatus having a stabilizing member, wherein the concave groove portion of the stabilizing member is formed so that the groove width thereof becomes wider toward the radially inner side of the record carrier.