JPH0770138B2 - Magnetic recording / reproducing device - Google Patents

Description

The present invention relates to a magnetic recording / reproducing apparatus using a flexible magnetic disk, which is also called a floppy disk, as a recording medium, and is particularly suitable for obtaining a stable head touch. The present invention relates to a magnetic recording / reproducing device.

[Conventional technology]

A high-density magnetic recording / reproducing apparatus that records / reproduces information by bringing a magnetic head into contact with a flexible magnetic disc that rotates at a high speed, in order to realize stable recording / reproduction, It is important to stabilize the contact state of the magnetic head so that a good head touch can always be obtained. In order to secure a stable head touch, conventionally, a disk attracting member integrated with the magnetic head is provided, and the rotating magnetic disk is attracted to the disk attracting member by using the negative pressure generated by the air flow. A method has been proposed.

For example, in the magnetic recording / reproducing apparatus disclosed in U.S. Pat.No. 4,578,727, a disk-shaped running-stabilizing flat plate disposed at a slight distance from the magnetic disk is provided in a hard jacket containing the magnetic disk. When the disk attracting member is inserted into the window portion of the traveling stable flat plate when the magnetic disk rotates, the magnetic disk is attracted to the disk attracting member by the negative pressure generated by the air flow on the surface of the magnetic disk. ing. Therefore, the magnetic head arranged in the central portion of the disk attracting member can be stably brought into contact with the recording surface of the magnetic disk, and good recording / reproducing characteristics can always be obtained.

Further, in the magnetic recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 61-9869, as shown in FIG. 13, the attraction plane 30a of the disk attraction member 30, which is the surface facing the magnetic disk 1, is
The magnetic disk 1 is inclined with respect to the rotation surface (the arrow in the figure indicates the rotation direction), and negative pressure is generated in the wedge-shaped space formed between the attraction plane 30a and the magnetic disk 1. As a result, the rotating magnetic disk 1 is attracted to the attraction plane 30a.

[Problems to be solved by the invention]

However, the former conventional technique requires a built-in running-stabilizing flat plate in the hard jacket in order to stably attract the magnetic disk to the disk attracting member, so that the disk cartridge is expensive due to the special jacket structure. There was a problem that it would end up being something wrong. Further, in the latter conventional technique, since the attraction plane 30a of the disk attraction member 30 is inclined with respect to the rotation surface of the magnetic disk 1,
As shown in Fig. 13, the magnetic disk 1 is located on the downstream side in the rotation direction.
May contact the inner wall of the hard jacket 2, which may damage the recording surface of the magnetic disk 1 or impair the stability of adsorption.

The present invention has been made in view of the above points, and an object thereof is always to obtain a good head touch without the risk of damaging the recording surface of the magnetic disk, and without requiring a special jacket structure. Another object of the present invention is to provide a magnetic recording / reproducing apparatus.

[Means for solving problems]

In the magnetic recording / reproducing apparatus which records and / or reproduces information on a rotating flexible magnetic disk by a magnetic head, a flat adsorption plane is provided on the surface, and the adsorption plane is provided substantially at the center of the adsorption plane. A magnetic disk head is provided with a disk attracting member that exposes an operating gap portion, and the attracting plane of the disk attracting member is on the recording surface side of the magnetic disk and is substantially parallel to and substantially parallel to the rotating plane of the magnetic disk. The disk is located inside the disk and is located on the opposite side of the disk attracting member across the magnetic disk and on the upstream side in the rotating direction of the magnetic disk so as not to overlap with the disk attracting member. To provide a height regulating member which is set at a height position substantially the same as the attraction plane of the attraction member and which suppresses lifting of the magnetic disk. What, is achieved.

[Action]

That is, the present invention regulates the height position of the magnetic disc during rotational driving by the height regulating member arranged on the upstream side of the disc attracting member, and the air flow accompanying the rotation causes the magnetic disc and the attracting flat surface of the disc attracting member. It is possible to generate a negative pressure to stably attract the magnetic disk to the attracting plane by suppressing the magnetic head from entering into the gap between the magnetic head and the magnetic head that appears at the opening of the attracting plane. It can be brought into stable contact with the surface. Further, since the disk suction member and the height regulating member are arranged so as to be offset from each other,
They do not directly sandwich the magnetic disk, so there is no risk of increasing the rotational load torque or damaging the magnetic disk. Further, since the attraction plane of the disk attraction member is parallel to the rotation surface of the magnetic disk and is located in substantially the same plane, there is no problem that the magnetic disk is largely bent and comes into contact with the inner wall of the hard jacket. Therefore, there is no risk of damaging the recording surface or impairing the stability of adsorption.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. 1 to 6 are for explaining one embodiment of the present invention. FIG. 1 is a perspective view showing the structure of the main part, FIG. 2 is its plan view, and FIG. 3 shows a magnetic disk. FIG. 4 is an external view of a disk cartridge, FIG. 5 is an external view of a line AA ′ in FIG. 4, and FIG. 6 is an external view of a height regulating member. Is.

In these figures, the flexible magnetic disk 1
Is made of polyester with a thickness of about 40 μm and a diameter of about 50 mm, and the central portion is reinforced by a center core 6, while the hard jacket 2 is a plastic resin having a window 2a at a predetermined position. As a molded product, a magnetic disk 1 is rotatably housed inside the hard jacket 2 to form a disk cartridge. And
When this disk cartridge is loaded in a magnetic recording / reproducing apparatus, the spindle portion of a motor (not shown) is fitted to the center core 6 so that the magnetic disk 1 is rotated at a high speed of 3600 rpm.

The disk attracting member 3 is made by processing a hard material such as non-magnetic ceramic into a predetermined shape.
The suction plane 3a facing the recording surface is mirror-finished, and the peripheral edge of the suction plane 3a is finished to have a smooth curved surface with no edges.

An opening 8 for arranging a magnetic head 4 to be described later is formed in the center of the attraction plane 3a.

The magnetic head 4 is fixed to the upper end of a head base 7 made of a non-magnetic material, and the disk suction member 3 is bonded to the upper part of the head base 7 with an adhesive or the like to form the tip end surface of the gear head of the magnetic head 4. Is positioned substantially in the same plane as the suction plane 3a in the opening 8.

In this way, the head block formed by integrating the disk suction member 3 with the head base 7 is screwed to the head carriage (not shown) that is transported in the radial direction of the magnetic disk 1 by the mounting hole 9 of the head base 7, and is indicated by an arrow T in the figure.
It is possible to reciprocate within a predetermined range along the direction.
When the head base 7 is attached to the head carriage, the height and posture are set so that the suction plane 3a of the disk suction member 3 is located substantially parallel to and substantially in the same plane as the rotation surface of the magnetic disk 1. ing.

The height regulating member 5 is made of a material having good slidability that is hard to damage the magnetic disk 1, for example, plastic resin or the like processed into a shape as shown in FIG. 6, and when the disk cartridge is loaded, the hard disk is loaded. It is adapted to be inserted into the window portion 2a of the kit 2 to regulate the height position of the magnetic disk 1. That is, as shown in FIG. 3, the height restricting member 5 is on the opposite side of the magnetic disk 1 from the disk attracting member 3 and in the rotating direction of the magnetic disk 1 (direction of arrow V in the figure). The magnetic disk 1 is arranged on the upstream side, and the tip 5a of the height regulating member 5 is projected slightly downward from the suction plane 3a to push down the magnetic disk 1 so that the magnetic disk 1
Is restricted in height so as not to separate from at least the upstream end of the suction plane 3a.

In the above configuration, when the magnetic disk is driven to rotate in the direction of arrow V at a high speed, a negative pressure is generated between the magnetic disk 1 and the suction plane 3a of the disk suction member 3 due to the airflow accompanying this rotation, and FIG. Since the magnetic disk 1 is attracted to the attracting flat surface 3a as shown in FIG. 2, the tip end surface of the magnetic head 4 of the magnetic head 4 exposed in the opening 8 can be stably brought into contact with the recording surface of the magnetic disk 1. Even when the magnetic carriage 4 is moved and the magnetic head 4 moves in the direction of the arrow T, the magnetic disk 1 rotated at high speed is stably attracted to the attracting plane 3a, so that the inner track to the outer track. The contact state of the magnetic head 4 with respect to the recording surface is stable up to.

Next, the above-mentioned adsorption principle will be described in detail with reference to FIG.

Now, when the flexible member D is arranged so as to be substantially flush with the upper end surface of the fixing member S, and a small amount of a part of this member D is pushed down by the regulating member C arranged at a position displaced from the fixing member S, A wedge-shaped space having a taper angle θ is formed between the upper end surface of the fixing member S and the member D. Then, when the member D is moved in the arrow direction at a speed v in this state, a predetermined negative pressure is generated in the wedge-shaped space having the taper angle θ in terms of fluid dynamics.
Is attracted to the fixing member S by a force corresponding to the magnitude of the velocity v, and if the velocity v is sufficiently large, the member D is attracted to the upper end surface of the fixing member S as indicated by the broken line.

As described above, in this embodiment, since the magnetic disk 1 is attracted to the attraction flat surface 3a of the disk attraction member 3 during rotational driving, the head touch is always good, and stable recording / reproducing characteristics are obtained. Further, since the attracting plane 3a is located substantially in the same plane as the rotating surface of the magnetic disk 1, the amount of deformation in the height direction of the magnetic disk 1 is very small. Therefore, the magnetic disk is placed on the inner wall of the hard jacket. If the recording surface is damaged by contact or the stability of adsorption is impaired, no trouble will occur.

8 (a) and 8 (b) are an exploded perspective view and an external view of a head block showing a modified example of the disk suction member used in the above embodiment. The disk suction member 3 shown in FIG.
The conductive ceramics material is processed into a plate shape having an opening 8 in the central portion, and the attraction plane 3a facing the recording surface of the magnetic disk is mirror-finished. The periphery is finished with a smooth curved surface without edges. When the plate-shaped disc attracting member 3 is joined to the head base 7 made of a non-magnetic metal material having the magnetic head 4 fixed to the upper end, the metal supporting member 10 is used.
The tip end surface of the gear head of the magnetic head 4 is exposed in the opening 8 of the disk attracting member 3 which is resin-bonded through the head base 7 and is thus integrated with the head base 7.

Further, FIG. 9 and FIG. 10 are external views showing modifications of the height regulating member used in the above embodiment. That is, in both FIGS. 9 and 10, a cushioning material 20 such as a non-woven fabric is attached to the tip of the height regulating member 5, and by using the cushioning material 20 together in this way, the magnetic disk is lengthened. There is no need to worry about scratching the back surface of the magnetic disk even when it is rotated for a long time. The base portion of the height regulating member 5 to which the cushioning material 20 is attached may have a simple shape without any special processing, as shown in FIG.

Next, another embodiment of the present invention will be described with reference to FIGS. 11 and 12.

FIG. 11 is a cross-sectional view of an essential part showing a state where the magnetic disk is stopped rotating, and FIG. 12 is a cross-sectional view of an essential part showing a state where the magnetic disk is rotationally driven. Reference numeral 15 in the drawing is a height regulation The members are shown, and the members corresponding to those in FIG. 3 are denoted by the same reference numerals.

In this embodiment, the height regulating member 15 for regulating the height position of the magnetic disk 1 is formed with a taper surface as shown in the drawing which is inclined with respect to the rotation surface of the magnetic disk 1, and This is different from the above embodiment in that the tip portion 15a is located slightly above the suction plane 3a of the disc suction member 3. Therefore, when the magnetic disk 1 is rotationally driven at a high speed in the direction of arrow V, a positive pressure is generated between the magnetic disk 1 and the tip portion 15a of the height regulating member 15 due to the airflow accompanying this rotation, As shown in FIG. 12, since the magnetic disk 1 is pushed downward, the relative positional relationship between the magnetic disk 1 and the disk attracting member 3 is the same as in the above embodiment, and the magnetic disk 1 is stably attracted to the attracting plane 3a. be able to.

That is, this embodiment is characterized in that the height restricting member 15 does not directly push down the magnetic disk 1, but uses the positive pressure generated by the airflow to push down. As a result, when the rotation is stopped, the magnetic disk 1 does not receive a pressing force from the disk attracting member 3 and the height restricting member 15, so that there is no risk of deformation, and the magnetic disk 1 and the height restricting member 15 do not rotate when driven. Since the air flow is interposed between the magnetic disk 1 and the height regulating member, the height of the magnetic disk is directly in contact with the magnetic disk. Has the advantage.

When a drive motor is used in which the increase of the rotational load torque due to the generation of static electricity or the like is not a particular problem, the disk attracting member need not be a conductive material. Further, as the disk adsorbing member, a material other than ceramics, for example, a glass material, a hard metal, or a member provided with chrome plating may be used.

Further, in each of the above-described embodiments, a single head for both recording and reproduction is used as the magnetic head. The provided frame recording / reproducing head or the like may be used, or a dedicated erasing head may be provided in the vicinity of the recording / reproducing head and both may be arranged together in the opening of the disk suction member.

〔The invention's effect〕

As described above, according to the present invention, since the magnetic disk during rotational driving can be stably attracted to the attracting plane of the disc attracting member, the disc cartridge having the special jacket structure having the traveling stabilizing plane plate built therein. It is economical because there is no need to use a magnetic disk, and since the adsorption plane is approximately parallel to and substantially in the same plane as the rotating surface of the magnetic disk, there is a risk that the magnetic disk will contact the inner wall of the hard jacket. Therefore, it is possible to always obtain a good head touch without causing a trouble such as damage to the recording surface or loss of stability of adsorption.

[Brief description of drawings]

1 to 6 are for explaining one embodiment of the present invention. FIG. 1 is a perspective view showing the structure of the main part, FIG. 2 is its plan view, and FIG. 3 shows a magnetic disk. FIG. 4 is an external view of a disk cartridge, FIG. 5 is an external view of a line AA ′ in FIG. 4, and FIG. 6 is an external view of a height regulating member. FIG. 7 is an explanatory view showing the suction principle, FIGS. 8 (a) and 8 (b) are exploded perspective views and external views of a head block showing a modified example of the disk suction member used in the above embodiment, FIG. 9 and FIG. FIG. 10 is an external view showing a modified example of the height regulating member used in the above embodiment, FIGS. 11 and 12 are for explaining another embodiment of the present invention, and FIG. 11 is a magnetic disk. Fig. 12 is a sectional view of the main part showing the state where the rotation of the magnetic disk is stopped. FIG. 13 and FIG. 13 are cross-sectional views of essential parts showing an example of a conventional technique. 1 ... Magnetic disk, 3 ... Disk suction member, 3a ...
Adsorption plane, 4 ... Magnetic head, 5,15 ... Height control member,
8 ... Opening.

Claims (1)

[Claims] 1. A magnetic recording / reproducing apparatus for recording and / or reproducing information on a rotating flexible magnetic disk by a magnetic head, wherein a flat adsorption plane is provided on the surface, and the adsorption plane is substantially at the center. The magnetic head includes a disk attracting member that exposes an operating gap portion, and the attracting plane of the disk attracting member is substantially parallel to the recording surface side of the magnetic disk and substantially parallel to the rotating plane of the magnetic disk. The magnetic disk is disposed so as to be located in a plane, and the magnetic disk is sandwiched between the disk attracting member and the upstream side in the rotating direction of the magnetic disk, the area not overlapping the disk attracting member. A height regulating member is provided which is set at substantially the same height as the above-mentioned attraction plane of the disc attraction member and suppresses the magnetic disk from rising. Magnetic recording and reproducing apparatus characterized.