JPH01150269A - Magnetic tape recording and reproducing device - Google Patents

Abstract

PURPOSE:To stably abut a magnetic head upon a magnetic disk recording face by regulating the height of a rotating magnetic disk by a height regulating member arranged on the upstream side of a disk attracting member exposing the magnetic head to an aperture part. CONSTITUTION:The height regulating member 5 is arranged on the opposite side to the disk attracting member 3 through the magnetic disk 1 and on the upstream side of the member 3 in a rotating direction V to project its tip part 5a slightly downward from an attracting plane 3a, depress the magnetic disk 1 and regulate the height position of the disk 1 so that the disk 1 is not separated from the end part of the upstream side of the attracting plane 3a. In said constitution, negative pressure is generated between the disk 1 and the plane 3a of the member 3 by an air flow due to the rotation of the disk 1, the disk 1 is attracted to the plane 3a and the gap tip face of the magnetic head 4 exposed into the aperture part 8 is stably abutted upon the recording face of the disk 1.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a magnetic recording/reproducing device using a flexible magnetic disk, also called a floppy disk, as a recording medium, and particularly relates to a magnetic recording/reproducing device that uses a flexible magnetic disk, also called a floppy disk, as a recording medium. The present invention relates to a suitable magnetic recording/reproducing device.

[Conventional technology]

In a high-density magnetic recording/reproducing device that records/reproduces information by bringing a magnetic head into contact with a flexible magnetic disk that rotates at high speed, in order to achieve stable recording/reproduction, it is necessary to It is important to stabilize the contact state of the magnetic head so that good head touch can always be obtained. In order to ensure stable head touch, conventionally a disk adsorption member is provided that is integrated with the magnetic head, and the rotating magnetic disk is adsorbed to this disk adsorption member using negative pressure generated by airflow. A method has been proposed.

For example, in the magnetic recording and reproducing device disclosed in U.S. Pat. No. 4,578,727, a disk-shaped running stabilizing flat plate is provided in a hard jacket housing a magnetic disk, and is arranged at a slight distance from the magnetic disk. When a disk adsorption member is inserted into the window of the running stabilizing flat plate while the magnetic disk is rotating, the magnetic disk is attracted to the disk adsorption member by negative pressure generated by air flow on the surface of the magnetic disk. Therefore, the magnetic head disposed at the center of the disk adsorption member can be brought into stable contact with the recording surface of the magnetic disk, making it possible to always obtain good recording and reproducing characteristics.

Further, in the magnetic recording and reproducing apparatus disclosed in Japanese Patent Application Laid-Open No. 61-9869, as shown in FIG. By generating negative pressure in the wedge-shaped space formed between the attraction plane 30a and the magnetic disk 1, , the rotating magnetic disk 1 is attracted to the attraction plane 30a.

[Problems to be Solved by the Invention] However, the former prior art requires a special jacket structure because it is necessary to incorporate a running stabilizing flat plate in the hard jacket in order to stably adsorb the magnetic disk to the disk adsorption member. Therefore, there was a problem that the disk cartridge became expensive. Furthermore, in the latter prior art, since the suction plane 30a of the disk suction member 30 is inclined with respect to the rotating surface of the magnetic disk 1,
As shown in FIG. 13, there is a wide area where the magnetic disk 1 contacts the inner wall of the hard jacket 2 on the downstream side in the rotation direction, which may damage the recording surface of the magnetic disk 1 or impair the stability of suction. There was a risk.

The present invention was made in consideration of the ridges, and its purpose is to always provide good head touch without the risk of damaging the recording surface of the magnetic disk and without requiring a special jacket structure. The object of the present invention is to provide a magnetic recording/reproducing device obtained by the present invention.

[Means for solving problems]

The above object is a disk which has a magnetic head protruding from an opening and which is arranged to face the recording surface of a magnetic disk, with the opposing surface being a suction plane located parallel to and substantially in the same plane as the rotating surface of the magnetic disk. an adsorption member, and a height regulation disposed on the opposite side of the disk adsorption member across the magnetic disk and upstream in the rotational direction of the magnetic disk, for regulating the height position of the magnetic disk with respect to the adsorption plane. This is achieved by providing a member.

[Effect]

That is, in the present invention, the height position of the magnetic disk during rotational driving is regulated by the height regulating member disposed upstream of the disk adsorption member, and the air flow accompanying the rotation is prevented from reaching the adsorption plane between the magnetic disk and the disk adsorption member. By preventing the magnetic disk from entering between the gaps, negative pressure can be generated and the magnetic disk can be stably attracted to the adsorption plane, and the magnetic head, which is exposed through the opening of this adsorption plane, can be stably attached to the recording surface of the magnetic disk. can be brought into contact. In addition, since the disk adsorption member and the height regulating member are arranged offset from each other, the magnetic disk is not directly held between them, so there is no risk of an increase in rotational load torque or damage to the magnetic disk. . In addition, since the adsorption plane of the disk adsorption member is located parallel to and almost in the same plane as the rotating surface of the magnetic disk, problems such as the magnetic disk being bent greatly and coming into contact with the inner wall of the hard jacket do not occur, and therefore recording There is no need to worry about damage to the surface or loss of suction stability.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

Figures 1 to 6 are for explaining one embodiment of the present invention. Figure 1 is a perspective view showing the configuration of the main parts, Figure 2 is a plan view thereof, and Figure 3 shows a magnetic disk. FIG. 4 is an external view of the disc cartridge, FIG. 5 is a cross-sectional view taken along line A-A' in FIG. 4, and FIG. 6 is an external view of the height regulating member. be.

In these figures, a flexible magnetic disk l is formed based on polyester and has a thickness of about 40 μm and a diameter of about 50 mm, and its center portion is formed by a center core 6.
On the other hand, the hard jacket 2 is a plastic resin molded product having a window 2a at a predetermined position, and the magnetic disk 1 is rotatably housed inside the hard jacket 2 to form a disk cartridge. . When this disk cartridge is loaded into a magnetic recording/reproducing apparatus, a spindle portion of a motor (not shown) is fitted into the center core 6, and the magnetic disk 1 is driven to rotate at a high speed of 350 Qrpm.

The disk adsorption member 3 is made of a hard material such as non-magnetic ceramics processed into a predetermined shape, and holds the magnetic disk 1.
The suction plane 3a facing the recording surface is mirror-finished, and the peripheral edge of the suction plane 3a is finished into a smooth curved surface without edges.

Further, an opening 8 for arranging a magnetic head 4, which will 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 case 7 made of a non-magnetic material, and the gap between the magnetic head 4 is fixed by joining the disk adsorption member 3 to the upper part of the head case 7 via an adhesive or the like. The tip end surface is positioned within the opening 8 in substantially the same plane as the suction plane 3a.

The head block formed by integrating the disk suction member 3 and the head base 7 in this manner is mounted by screwing the head base 7 through the holes 9 to a head carriage (not shown) that is transported in the radial direction of the magnetic disk 1. Arrow T in the diagram
It is possible to reciprocate within a predetermined range along the direction.

Note that when attaching the head base 7 to the head carriage, the height and posture settings are made so that the adsorption plane 3a of the disk adsorption member 3 is located parallel to and approximately in the same plane as the rotating surface of the magnetic disk 1. being done.

The height regulating member 5 is made of a material that does not easily damage the magnetic disk 1 and has good sliding properties, such as plastic resin, and is processed into the shape shown in FIG. The height position of the magnetic disk 1 is regulated by being inserted into the window 2a of the magnetic disk 1. That is, as shown in FIG. 3, this height regulating member 5 is located on the opposite side of the disk adsorption member 3 with the magnetic disk 1 in between, and in the direction of rotation of the magnetic disk 1 (the direction of the arrow ■ in the figure). The height regulating member 5 is arranged on the upstream side.
By pushing down the magnetic head 1 by protruding the tip 5a slightly below the suction plane 3a, the height position of the magnetic disk 1 is regulated so that it does not separate from at least the upstream end of the suction plane 3a. .

In the above configuration, when the magnetic disk 1 is driven to rotate at high speed in the direction of the arrow ■, a negative pressure is generated between the magnetic disk 1 and the adsorption surface 3a of the disk adsorption member 3 due to the airflow accompanying this rotation, as shown in FIG. As shown, the magnetic disk 1 is attracted to the attraction plane 3a, so that the gap end surface of the magnetic head 4 protruding into the opening 8 can be stably brought into contact with the recording surface of the magnetic disk 1. Note that even when the head carriage is transferred and the magnetic head 4 moves along the direction of the arrow T, the magnetic disk 1 that rotates at high speed is stably attracted to the attraction plane 3a, so that it moves from the inner track to the outer track. The state of contact of the magnetic head 4 with the recording surface is stable up to the track.

Next, the above-mentioned adsorption principle will be explained in detail using FIG. 7.

Now, if a flexible member is arranged so that it is almost flush with the upper end surface of the fixed member S, and a part of this member is pushed down by a small amount with the regulating member C arranged at a position shifted from the fixed 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 member. If the member is moved in this state at a speed V in the direction of the arrow, fluid dynamics will occur within the wedge-shaped space with the taper angle θ.
Since a certain negative pressure is generated, flexible members
It is attracted to the fixed member S by a force corresponding to the magnitude of the velocity V, and if the velocity V is sufficiently large, the member is attracted to the upper end surface of the fixed member S as shown by the broken line.

As described above, in this embodiment, since the magnetic disk 1 is attracted to the attraction plane 3a of the disk attraction member 3 during rotational driving, the head touch is always good and stable recording and reproducing characteristics can be obtained. In addition, since the suction plane 3a is located almost in the same plane as the rotating surface of the magnetic disk 1,
The amount of deformation of the magnetic disk 1 in the height direction is very small (therefore, problems such as the magnetic disk coming into contact with the inner wall of the hard jacket and damaging the recording surface or impairing the stability of suction do not occur).

FIG. 8 (bl) is an exploded perspective view and an external view of a head block showing a modification of the disk suction member used in the above embodiment. The disk suction member 3 shown in the figure is made of a conductive ceramic material and an opening 8 in the center.
The suction plane 3a facing the recording surface of the magnetic disk is mirror-finished, and the peripheral edge of the suction plane 3a is finished into a smooth curved surface without edges.

When joining this plate-shaped disk adsorption member 3 to a head base 7 made of a non-magnetic metal material with a magnetic head 4 fixed to the upper end, resin bonding is performed via a metal support member 10. The gap end face of the magnetic head 4 is exposed within the opening 8 of the disk adsorption member 3 integrated into the head base 7 in this manner.

Moreover, FIG. 9 and FIG. 10 are external views showing modified examples of the height regulating member used in the above embodiment, respectively. That is, in both Figures 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 in this way, the magnetic disk can be held for a long time. There is no need to worry about damaging the back surface of the magnetic disk even when it is rotated. Note that 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 based on FIG. 11 and FIG. 12.

Fig. 11 is a sectional view of the main part showing a state where the rotation of the magnetic disk is stopped, and Fig. 12 is a sectional view of the main part showing a state where the magnetic disk is rotationally driven. Components corresponding to those in FIG. 3 are given the same reference numerals.

In this embodiment, a tapered surface as shown in the figure which is inclined with respect to the rotating surface of the magnetic disk 1 is formed on the tip end 15a of the height regulating member 15 that regulates the height position of the magnetic disk 1. This tip 15a is attached to the disk suction member 3.
This differs from the previous embodiment in that it is located slightly above the suction plane 3a. Therefore, when the magnetic disk 1 is driven to rotate at high speed in the direction of arrow V, positive pressure is generated between the magnetic disk 1 and the tip 15a of the height regulating member 15 due to the amount of air accompanying this rotation, as shown in FIG. Since the magnetic disk 1 is pushed downward in this manner, the relative positional relationship between the magnetic disk 1 and the disk suction member 3 is the same as in the previous embodiment, and the magnetic disk 1 can be stably attracted to the suction plane 3a.

That is, this embodiment is characterized in that the height regulating member 15 does not push down the magnetic disk 1 directly, but uses positive pressure generated by air flow to push it down. As a result, when the magnetic disk 1 is stopped rotating, the magnetic disk 1 is not subjected to any pressing force from the disk adsorption member 3 and the height regulating member 15, so there is no risk of deformation. Since there is an air flow between them, the rotational load torque is reduced in addition to the advantage that the back surface of the magnetic disk 1 is less likely to be damaged, compared to the above embodiment in which the height regulating member was in direct sliding contact with the magnetic disk. It has the advantage of

Note that when using a drive motor in which an increase in rotational load torque due to generation of static electricity or the like is not a particular problem, the disk adsorption member does not need to be made of a conductive material. Furthermore, a material other than ceramics, such as a glass material, a hard metal, or a member coated with chrome plating, may be used as the disk adsorption member.

In addition, in each of the above embodiments, a single head for both recording and reproduction is used as the magnetic head, but in addition to this, a head for recording only, a head for reproduction only, a head for erasing, and even a two-channel magnetic head are used. A frame recording/reproducing head or the like in which the recording/reproducing head is arranged in parallel may be used, or a dedicated erasing head may be provided near the recording/reproducing head, and both may be arranged together within the opening of the disk suction member.

〔Effect of the invention〕

As explained above, according to the present invention, there is no need to use a disk cartridge with a special jacket structure that includes a running stabilizing flat plate in order to attract the magnetic disk during rotation drive to the suction plane of the disk suction member. In addition, since the suction plane is located parallel to and almost in the same plane as the rotating surface of the magnetic disk, there is no risk of the magnetic disk coming into contact with the inner wall of the hard jacket, thus preventing damage to the recording surface. A good head touch can always be obtained without causing problems such as smearing or loss of suction stability.

[Brief explanation of the drawing]

Figures 1 to 6 are for explaining one embodiment of the present invention. Figure 1 is a perspective view showing the configuration of the main parts, Figure 2 is a plan view thereof, and Figure 3 shows a magnetic disk. 4 is an external view of the disk cartridge, FIG. 5 is a sectional view taken along line A-A' in FIG. 4, and FIG. 6 is an external view of the height regulating member. FIG. 7 is an explanatory diagram showing the suction principle, FIG. 8 (al), (b) is an exploded perspective view and external view of a head block showing a modification of the disk suction member used in the above embodiment, and FIGS. 9 and 10. The figures are external views showing modified examples of the height regulating member used in the above-mentioned embodiments, and FIGS. 11 and 12 are for explaining other embodiments of the present invention. FIG. 12 is a sectional view of the main part showing a state where the rotation is stopped, FIG. 12 is a sectional view of the main part showing the state where the magnetic disk is rotationally driven, and FIG. 13 is a sectional view of the main part showing an example of the prior art. 1... Magnetic disk, 3... Disc adsorption member, 3a... Adsorption plane, 4...
Magnetic head, 5.15...Height regulating member, 8.
·····Aperture. Fig. 1 Fig. 2 Fig. 1 2 Target flea disk 2: Heart saw 〒7... Fig. 3 Fig. 4 Δ' Fig. 5 Fig. 6 Fig. 7 Fig. 8 (0) (b) Sn Fig. 9 Figure 10 Figure 11 Figure 12 Figure 13

Claims (1)

[Claims] 1. In a magnetic recording and reproducing apparatus that rotates a flexible magnetic disk at high speed and records and/or reproduces information on the magnetic disk using a magnetic head, recording on the magnetic disk is performed by making the magnetic head protrude from an opening. a disk adsorption member disposed opposite to the surface of the magnetic disk, the opposing surface being an adsorption plane parallel to and substantially in the same plane as the rotating surface of the magnetic disk; and a side opposite to the disk adsorption member with the magnetic disk in between. What is claimed is: 1. A magnetic recording and reproducing apparatus comprising: a height regulating member disposed on the upstream side of the magnetic disk in the rotational direction to regulate the height position of the magnetic disk with respect to the attraction plane.