JPH0461062A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To reduce weight and improve vibration resistance by providing a magnetic disk possessing flexibility, a magnetic disk rotation driving means, two magnetic heads which records/reproduces information signal, and a magnetic head access means. CONSTITUTION:A magnetic disk 1, a spindle motor 2, magnetic heads 3A, 3B, a swing arm 4, a stepping motor 5, and magnetic head support bodies 1s9A,19B are provided. In the case, by fixing the magnetic disk 1 which has flexibility in a sealed container like a hard disk and using it, the thickness of the magnetic disk 1 itself can be set to be very thin compared to the hard disk, and the whole magnetic disk device can be thinned and lightened. Further, the magnetic disk 1 possesses flexibility, so even if the magnetic disk 1 collides with the magnetic heads 3A,3B by a shock from the outside, neither the magnetic heads 3A, 3b or the magnetic disk 1 is damaged. Thus, the vibration resistance is improved, and the density can be made high.

Description

DETAILED DESCRIPTION OF THE INVENTION; Field of Industrial Application] The present invention relates to a magnetic disk, and more particularly to a magnetic disk device in which a visible magnetic disk is used in a fixed manner, such as a hard disk.

2. Prior Art] Magnetic disk drives that record/reproduce information signals on magnetic recording media formed on disks are now widely used as external recording devices for information processing devices such as computers and word processors. ing. These magnetic recording media include magnetic disks whose bases are made of hard materials (hereinafter referred to as hard disks) and magnetic disks whose bases are made of visible materials (hereinafter referred to as flexible disks). In hard disks, a floating type Herad slider is used, and a magnetic head flies minutely from the disk surface to perform recording/reproduction, and in flexible disks, recording/reproduction is performed by sliding in contact with the magnetic head. The reason we use a floating Herad slider for hard disks is because hard hard disks rotate at high speeds, and if something solid comes into contact with the hard disk surface, the magnetic recording layer will be damaged and information will be destroyed. For this reason, although hard disks have a large recording capacity, they are difficult to handle.

In addition, in the case of flexible disks, the disk rotation speed is slower and the track width is larger than that of hard disks, so the storage capacity is small, but even if the magnetic head slides or contacts, the magnetic recording layer is not formed. Since the base body is visible, the base body deforms and releases the force exerted by the magnetic head without causing damage to the magnetic recording layer. That is, compared to hard disks, flexible disks have a smaller storage capacity but are easier to use.

[Problem to be solved by the invention] However, in magnetic disk devices using conventional hard disks, the hard disk itself is flat, which imposes a burden on cost, and the overall weight of the magnetic disk device is heavy. Ta. Furthermore, collisions between the magnetic head and the hard disk due to external vibrations cause problems such as scratching the surface of the hard disk or damaging the magnetic head.

Furthermore, in a magnetic disk device using a visible flexible disk, the flexible disk can be attached to and removed from the magnetic disk device. Therefore, in order to prevent crosstalk from occurring, it is necessary to provide a certain amount of space between the storage tracks on the flexible disk, making it difficult to achieve high density and large capacity.

In view of the above problems, it is an object of the present invention to reduce the weight, improve vibration resistance, and further increase the density and capacity of a flexible disk.

[Means for Solving the Problems] Therefore, in the magnetic disk device according to the present invention, in a magnetic disk device in which information signals are recorded/reproduced on/from a flexible magnetic disk using a magnetic head, one A magnetic disk having visibility, a magnetic disk rotation driving means for supporting and rotating the magnetic disk, and two devices for recording/reproducing information signals on recording surfaces formed on both surfaces of the magnetic disk. a magnetic head; a magnetic head support means that supports each of the magnetic heads and attracts the magnetic disk by a flow of gas on the surface of the magnetic disk; When the two magnetic heads are positioned on the outermost track of the surface of the magnetic disk, the other magnetic head is positioned on the innermost track of the other surface of the magnetic disk. This is achieved by having a magnetic head access means for accessing the position.

[Since a magnetic disk with visible operation is fixed in a sealed container like a hard disk, the thickness of the magnetic disk itself can be set extremely thin compared to a hard disk, making the entire magnetic disk device thin.・Can be made lighter. Furthermore, since the magnetic disk is visible, even if the magnetic head and the magnetic disk collide due to an external impact, the magnetic head and the magnetic disk will not be damaged.

In addition, since the magnetic heads are located far apart from each other on the magnetic disk, even if the magnetic disk becomes distorted around one magnetic head, the magnetic disk will return to its original stable state by the time it approaches the other magnetic head. Since each magnetic head recovers, each magnetic head is not affected by the other, allowing stable recording/recording.
Can be played. Furthermore, since a flexible magnetic disk is used while being fixed in a closed container, there is no need to provide a margin for the recording track width due to a removable type, and high density can be achieved.

[Example code] Embodiments of the present invention will be described below based on the drawings.

FIG. 1 is a plan view of a magnetic disk drive according to an embodiment of the present invention with the top cover removed, and FIG. 2 is a side sectional view of the magnetic disk drive.

The magnetic disk drive device shown in these figures includes one visible magnetic disk 1, a spindle motor 2 which is a magnetic disk rotation drive means for supporting and rotationally driving the magnetic disk 1, and two magnetic heads 3A for recording/reproducing information signals on the disk 1;
3B, a swing arm 4 that supports the magnetic heads 3A, 3B at its tip, and the magnetic heads 3A, 3B.
a stepping motor 5 serving as a magnetic head access means for rotating the swing arm 4 in order to seek in the radial direction of the magnetic disk 1; an upper substrate 6 on which a control circuit for controlling the entire apparatus is mounted; and each of the above-mentioned members. It mainly consists of a base plate 7 on which is mounted and supported.

First, in Figures 1 and 2, the diameter of 5.08 (2
The spindle motor 2 rotatably supports the magnetic disk 1 (INCH) and rotates it at a high speed of about 3600 rotations.
It is screwed and fixed to the spindle motor mounting portion of the base plate 7 so as to be at the same height as the height d of the base plate 7.

Further, the upper substrate 6 is arranged so that the distance between the magnetic disk 1 and the base plate 7 is the same as that of the magnetic disk 1.
It is placed on the top surface. By making the distance between the top and bottom surfaces of the magnetic disk 1 equal, the effect of the air flow during one revolution of the magnetic disk acts equally on the top and bottom surfaces of the magnetic disk, thereby preventing surface wobbling. .

Further, the stepping motor 5, which is a magnetic head access means, has a rotating shaft 8, and at the tip of the rotating shaft 8, two sheets of granite 9 are stacked one on top of the other, and are further connected to each other by a spring (not shown). By configuring the two pinions 9, 9 as described above, it is possible to prevent play in meshing with the track 10, which will be described later, and to improve the accuracy of head positioning. A rack 10 that meshes with the binion 99 is formed at the other end of the arms ilA and 11B, to which the magnetic heads 3A and 3B are attached, and the arms 11A and 11B have the rotating shaft 12 as a fulcrum. It is rotatably supported in accordance with the rotation of the rotary IFi+12. The magnetic heads 3A, 3B are arranged by arms 11A, 1
1B moves in the radial direction on one surface of the magnetic disk with rotational movement around the rotation axis 12, and records/reproduces information signals on a predetermined track. The components mounted on the base plate 7 are covered by an upper cover 14 fixed to the base plate 7 by four screws 13, 13.13. A gasket 15 made of an elastic material, for example, is disposed at the joint between the base plate 7 and the upper cover 14 in order to increase the degree of sealing inside the device and prevent external influences such as dust. A control board 16 for controlling the device is disposed below, and is covered by a lower cover 17. Additionally, a connector 18 for connecting to a computer is provided at the tip of the control board 16 and protrudes to the outside of the lower cover 17.

FIG. 3 is a plan view of the swing arm 4.

In FIG. 3, an upper arm 11A located on the upper surface of the magnetic disk 1 and a lower arm 11B located on the lower surface are arranged at an opening angle θ of 54.2° with the rotational support shaft 12 as the center. Further, the magnetic hend 3A38 is supported at the tips of the upper arm 11A and the lower arm 11B, respectively, and is installed in magnetic head supports 19^, 19B, which will be described later, so that the magnetic head 3A is attached to the upper surface of the magnetic disk 1. When moving from the outermost track to the innermost track,
The magnetic head 3B moves from the innermost track of the magnetic disk 1 to the outermost track. In addition, this magnetic head 3
Information signals input and output from the magnetic heads 3A and 3B are transmitted through conductors 5120.20 connected to one end of the magnetic heads 3A and 3B.
It is connected to an FPC (printed circuit board) 21 which is connected to the upper control board 6 through the FPC. Therefore, when the upper arm 11^ and the lower arm 11B rotate, the conductive wire 20.
20 is arranged along the side surface of each arm IIA, IIB so as to perform the same rotational movement as each arm 11^, 11B, and a holding member provided approximately at the center of each arm 11^, 11B. 22.22 and a holding portion 24.24 provided on the load beam 23.23.

The swing arm 4 is rotated by the stepping motor 5, and the rack 10, which engages with the two binions 9, 9 of the stepping motor 5, is provided on the opposite side of the swing arm 4 from the magnetic head mounting portion. It is being

Next, FIG. 4 is a side sectional view showing the positions of the magnetic disk 1 and the magnetic head supports 19A and 19B.6 In FIG. Magnetic head supports 19^, 19B are provided. Each magnetic head support 19^, 19B is supported by a magnetic head support mounting portion of the load beam 23, 23.

FIG. 5 is a plan view of the magnetic head supports 19^, 19B, and FIG. 6 is a sectional view taken along the line AA in FIG.

Here, in FIGS. 5 and 6, the magnetic head supports 19^, 19B are formed in a substantially fan shape, and have head attachment holes 25, 25 in the center thereof, into which the magnetic heads 3A, 3B are attached. This magnetic hend support 1
On the air inflow end side of the magnetic head supports 19A and 19B (direction A in the figure on the upstream side of the disk rotation), air flow accompanying the rotation of the disk tends to flow between the magnetic head supports 19A and 19B and the magnetic disk 1. A tapered portion 26 is formed so that the magnetic head supports 19A, 19B
A side surface 27 on the outer circumferential side of the magnetic disk and a side surface 28 on the inner circumferential side of the magnetic disk.
is formed in an arc shape with approximately the same curvature as the circumference of the magnetic disk 1. By giving the shape of an arc in this way, when the magnetic disk 1 is rotated, the airflow due to the rotation of the magnetic disk 1 flows in an arc shape with almost the same curvature as the magnetic disk 1, so that the magnetic By forming the side surfaces 27.28 of the head supports 19A, 19B in an arcuate shape with the same curvature as the airflow, the airflow flows smoothly on the side surfaces 27.28, so that the lateral surface received by the magnetic head supports 19A, 19B is reduced. The directional force is reduced, and the movement of the magnetic heads 3A, 3B is stabilized. Also,
Also in the central part of the magnetic head supports 19A and 19B, -
The recessed portion 30 with the end 29 closed is formed to have an inner side surface 31.32 having the same curvature as the arcuate shape of each side surface 27.28 of the magnetic head supports 19A, 19B. Then, the airflow enters between the magnetic disk 1 and the magnetic head supports 19^, 19B through the tapered portion 26, flows through this gap at high speed, and generates negative pressure in the recessed portion 30. The magnetic disk 1 is attracted to the magnetic head supports 19A and 19B, and the magnetic disk 1 is
Magnetic head supports 19^, 19B magnetic heads 3A, 3
B, but not the magnetic head supports 19A and 19B.

Now, the visible magnetic disk 1 generally uses an organic polymer film such as polyethylene terephthalate as its base material. The visible magnetic disk 1 is made by pulling out necessary parts of an organic polymer film from a roll and punching them into a circular shape. Therefore, when the medium is punched out, this film is always under tension in the longitudinal direction of the roll body, so the punched medium has anisotropy of elongation in the direction of tension, and the magnetic disk 1 is placed inside the closed container. Under the influence of temperature and humidity, it exhibits a substantially elliptical shape.

FIG. 7 shows a visible magnetic disk 1 having elongation anisotropy as described above.

In Figure 7, the direction in which elongation due to tension exists is the long axis X (horizontal line), and the direction perpendicular to the long axis X is the short axis Y.
(Vertical m> When closed, servo sectors are provided in at least one direction of the long axis A data zone D and a servo sector 31.82 are formed in the radial direction on the outer circumferential side.The servo sectors include a servo sector S1 formed in the long axis X direction, and a servo sector S2 formed in the short fiY direction. Both are located at right angles to the center of the magnetic disk 1.

As shown in FIG. 8, servo sector S1. In S2, servo signals F are alternately written at the same frequency in a staggered manner at positions equidistant from the center IIC in the longitudinal (circumferential) direction of each recording track T. In this case, since writing is performed using the same magnetic head 3B, the track width of the servo signal F and the recording track T matches the gap length of the magnetic heads 3A and 3B, and the off-track is the same as the gap length of the magnetic heads 3A and 3B. This occurs when the position deviates from the desired recording track T.

FIG. 9 shows a flowchart of head position correction by the servo mechanism of the present invention.

First, the magnetic heads 3^, 3B compare the servo correction values of the servo sector S1 in the long axis X direction in FIG. 7 and the servo sector S2 in the short axis Y direction. The presence or absence of the recording track T is confirmed by comparing the servo correction values. Here, if there is no eccentricity, the next servo information signal is read, but if there is eccentricity, the amount of eccentricity is calculated, and the amount of eccentricity is corrected. Compare the table and the above eccentricity. By comparing with this correction amount calculation table, the correction amount up to the desired recording track T is calculated, and the control amount is output using this correction amount.

If the gap G between the magnetic heads 3A and 3B is at the fine track position, tracking is performed as is by the correction means, and if the gap G between the magnetic heads 3A and 3B is not at the set fine track position, position control is performed again.

[Effects of the Invention] As explained above, according to the present invention, it is possible to realize a compact and lightweight magnetic disk device with high density and large capacity, which can use a visible magnetic disk in a fixed manner like a hard disk, at low cost. Furthermore, since the disk is visible, even if a magnetic head collides with the magnetic disk due to an impact or the like, the magnetic disk and the disk will not be damaged and have excellent vibration resistance.

Furthermore, if two magnetic heads are located apart from each other on both sides of the magnetic disk, and one magnetic head moves from the outermost track of the magnetic disk to the innermost track, the other magnetic head moves to the innermost track of the magnetic disk. Since it is configured to move from the innermost track to the outermost track,
Even if the magnetic disk is distorted by one of the magnetic heads and the magnetic head support means, the high-speed rotating magnetic disk will self-repair the distortion before it reaches the other magnetic head. In addition, it is rare for two magnetic heads to access the same circumference on the top and bottom surfaces of a magnetic disk, so even if one magnetic head disturbs the stable running of the magnetic disk, the effect will be absorbed by the other magnetic head. is not affected, and the recording/reproduction of information signals is stable. Furthermore, since the magnetic disk is used in a fixed manner, the width of the recording track can be set extremely narrow, which is extremely effective for increasing density.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention; FIG. 1 is a plan view of a magnetic disk device according to an embodiment of the present invention with the top cover removed; FIG. 2 is a side sectional view of the magnetic disk device; FIG. 3 is a plan view of the swing arm; FIG. 4 is a side sectional view showing the positions of the magnetic disk and the magnetic head support;
FIG. 5 is a plan view of the magnetic head support, FIG. 6 is a sectional view taken along the line A-A'' in FIG. Figure 8 shows the configuration of the servo sector, and Figure 9 shows a flowchart of head position correction by the servo mechanism. 1...Magnetic disk, 2...Spindle motor, 3
A, 3B...Magnetic head, 4...Swing arm, 5...Stepping motor, 19^, 19B...Magnetic head support patent applicant
Alps Electric Co., Ltd.

Claims (1)

[Claims] A magnetic disk device that records/reproduces information signals onto/from a flexible magnetic disk using a magnetic head includes one flexible magnetic disk and a magnetic disk that supports and rotates the magnetic disk. a disk rotation drive means; two magnetic heads for recording/reproducing information signals on recording surfaces formed on both surfaces of the magnetic disk;
a magnetic head supporting means that supports each of the magnetic heads and attracts the magnetic disk by the flow of gas on the surface of the magnetic disk; The two magnetic heads are accessed to predetermined positions on the magnetic disk with a relative positional relationship such that when positioned on the outer track, the other magnetic head is positioned on the innermost track on the other surface of the magnetic disk. a magnetic head access means;
A magnetic disk device comprising: