JPH0373482A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To enlarge a capacity and to miniatualize a magnetic disk device by superposing the two pairs of magnetic recording disk assemblies in one magnetic disk device to arrange them. CONSTITUTION:Information is stored in the magnetic recording disks 1 and 2, which are rotated by spindle motors 3 and 4 placed in hubs. As for the magnetic recording disk 1 and 2, the two pair of laminated magnetic recording disk assemblies are formed, both assemblies are arranged in a main body chassis 7 so that the spindles of both assemblies are made parallel, and the magnetic recording disks 1 and 2 of the magnetic recording disk assemblies are arranged to overlap each other. Thus, the samll-sized large capacity magnetic disk device can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic disk device, and particularly to a small-sized, large-capacity magnetic disk device.

[Conventional technology]

In conventional magnetic disk drives, a motor is placed inside a hub in order to realize a small and large storage capacity. By installing a so-called in-hub type motor.

The hub was lengthened to accommodate the motor that had previously been mounted at the bottom, and the number of magnetic disks was increased.

Further, in U.S. Pat. No. 3,984.873, two sets of magnetic recording disk assemblies in one magnetic disk device are accessed by one arm, and the center of rotation of this arm is set to the center of each recording disk. A structure is shown in which the heads are positioned on two groups of recording disks using one actuator, centered on a line connecting the two groups. This makes it possible to increase the storage capacity and downsize the magnetic disk device.

[Problem to be solved by the invention]

The above conventional technology was insufficient to achieve large capacity and miniaturization. For example, the diameter of the magnetic recording disk was 5.25 mm.
In inch half-hide magnetic disk drives, the number of recording disks increases from three to four by placing the motor in the hub, resulting in an improvement of only about 30%. .

Furthermore, in U.S. Patent No. 3,984,873, regarding the length of the magnetic disk device, the diameter of at least two magnetic recording disks and the width of the arm are required, and even if the capacity is doubled, the main body The length of the system was also doubled, which was equivalent to installing two identical devices, which was insufficient in terms of miniaturization.

An object of the present invention is to provide a compact yet large-capacity magnetic disk device.

[Means for Solving the Problems] In order to achieve the above object, two sets of magnetic recording disk assemblies are arranged in a magnetic disk device main body so that their spindles are parallel to each other, and The magnetic recording disks of the magnetic recording disk assembly are arranged so as to overlap.

Also, two groups of magnetic recording disk assemblies are accessed by heads attached to both sides of one arm. A voice coil motor for positioning the head on the magnetic recording disk is disposed on the bottom surface of the main body chassis, and the head is positioned by the voice coil motor with the center of the arm as an axis.

Also, to stabilize the head and make it float.

By reversing the rotational directions of the two groups of magnetic recording disks, the air flows in the same direction in the overlapped portion of the image recording disks. Furthermore, as shown in FIG. 5, it is also possible to insert a fixing plate into the overlapped portion of both magnetic recording disks to influence the airflow.

[Effect]

In the present invention, by arranging two sets of magnetic disk assemblies one on top of the other, a compact high-capacity magnetic disk device can be realized. Further, a voice coil motor for positioning two sets of heads attached to one arm to two sets of magnetic recording disks is placed on the bottom of the main body, and is driven by this voice coil motor to operate around the center of the arm.

Furthermore, by reversing the rotational directions of the two sets of magnetic disk assemblies, air flows in a fixed direction in the overlapping portion of the magnetic recording disks, making it possible to stabilize the flying characteristics of the head. Furthermore, by inserting a fixing plate into the overlapping portion of the magnetic recording disks, the magnetic recording disks are not affected by airflow due to rotation.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail using the drawings.

FIG. 1 shows a plan view showing the structure of a magnetic disk device according to the present invention, and FIG. 2 shows a side view of FIG. 1.

A magnetic recording disk 1.2 on which information is recorded is rotated by a spindle motor 3, 4 housed in a hub. The magnetic recording disks 1.2 are stacked to form two sets of magnetic recording disk assemblies, and the spindle motors 3 and 4 are brought close to each other so that the magnetic recording disks 1.2 are alternately overlapped, and the main body chassis 7 Place it in Further, heads 8 and 9 for reading and writing information are each attached to an arm 10.11, and the arm 10.11 is rotated by voice coil motors 14 and 15 with a rotating shaft 12.13 as a fulcrum, and the magnetic recording circle is rotated by voice coil motors 14 and 15. Access boards 1 and 2.

By arranging the two sets of magnetic recording disk assemblies in this way, the length of the magnetic disk body can be significantly shortened.

3 and 4 illustrate the magnetic recording disk 1 in FIG.
FIG. 2 is a diagram showing the air flow in the overlapping portion during rotation of No. 2;

When the magnetic recording disks 1.2 are rotated in the same direction, as shown in FIG. 3, the air flow becomes vortex-like and turbulent, and turbulence can be prevented as shown in FIG. 4. As a result, heads 8, 9
It is possible to stabilize the levitation characteristics of.

FIG. 5 shows a magnetic recording disk 1 of a magnetic disk device of the present invention.
．． It is a diagram in which a fixing plate is attached to the overlapping portion of the two.

By inserting the fixing plate, the head is not affected by the relative air flow between the GE magnetic recording disks 2, and the flying characteristics are further stabilized. In this case, there is no need to consider the direction of rotation of the magnetic recording disk 1.2.

Incidentally, in the magnetic disk drive having the configuration shown in FIGS. 1 and 2, the length of the magnetic disk drive has been significantly shortened, but the length of the magnetic disk drive has been significantly shortened. becomes longer by N.

In order to solve this problem, in another embodiment of the present invention, as shown in FIG. 6, an arm 17 for positioning the head 8.9 on the magnetic recording disks 1 and 2 is integrated, and the arm 17 The head 8.degree. 9 is positioned by rotation by a voice coil motor bobbin 20 directly connected to a guide shaft 18 located at the center thereof. The voice coil motor bobbin 20 is placed on the bottom of the main body chassis, so the width does not increase.By passing current through the coil wound on the voice coil motor bobbin 20, the coil 8 on the shaft interacts with the magnetic circuit 19. rotates, resulting in shaft 1
The arm 17 directly connected to the arm 8 rotates. Also, arm 1
7 and the center of gravity of the voice coil motor bobbin 20 are aligned on the rotation axis. By aligning the centers of gravity, the arm 17 can be rotated stably while suppressing variations in characteristics during seek. The width of the magnetic disk drive having the configuration shown in FIG. 6 is increased by the length of the movement range of the arm 17.

Further, if the balance between the voice coil motor bobbin 20 and the arm 17 is lost, a weight may be attached to the A portion.

Further, in the present invention, in order to further reduce costs, one spindle motor may be used and the other magnetic recording disk assembly may be rotated by a belt.

〔Effect of the invention〕

According to the present invention, by arranging two sets of magnetic recording disk assemblies in one magnetic disk device so as to partially overlap each other, it is possible to increase the capacity and reduce the size of the magnetic disk device.

Furthermore, by using a 41f structure in which two sets of magnetic recording disk assemblies are accessed by one arm, the width of the magnetic disk device can also be reduced.

[Brief explanation of drawings]

1 is a plan view of the structure of a magnetic disk drive according to an embodiment of the present invention, FIG. 2 is a side view of the magnetic disk drive of FIG. 1, and FIG. 3 is a view of two groups of recording disks in the same direction. FIG. 4 is a diagram showing the air flow when the two groups of recording disks rotate in opposite directions; FIG. 5 is a diagram showing how the fixing plate is mounted in the magnetic disk device; FIG. 6 is a plan view of the structure of a magnetic disk device according to a second embodiment of the present invention. DESCRIPTION OF SYMBOLS 1... Magnetic recording disk, 2... Magnetic recording disk, 3... Spindle motor, 4... Spindle motor, 5... Recording area, 6... Recording area, 7... Main body chassis, 8
...Head, 9...Head, 10...Arm, 1
DESCRIPTION OF SYMBOLS 1... Arm, 12... Rotating shaft, 13... Rotating shaft, 14... Voice coil motor, 15... Voice coil motor, 17... Fixed plate, 18... Guide shaft, ■9... Magnetosphere M, 20... Bobbin for voice coil motor. Collection I Example ne boiling figure 4-Rinshina Daida

Claims (1)

[Claims] 1. A plurality of magnetic recording disks, a magnetic recording disk assembly formed by laminating the magnetic recording disks, and a magnetic head for writing information on or reading information from the magnetic recording disks. and an arm for supporting the magnetic head, in which two sets of magnetic recording disk assemblies are arranged so that the spindles of the partners are parallel to each other, and the two sets of magnetic recording disk assemblies are A magnetic disk device characterized in that the two assemblies are arranged close to each other so that the magnetic recording disks of the assemblies partially overlap. 2. A magnetic disk device according to claim 1, wherein the rotation directions of the two sets of magnetic recording disk assemblies are reversed. 3. Two sets of magnetic recording disk assemblies, an arm for accessing the two sets of magnetic recording disk assemblies, a magnetic head supported by the arm, and a voice coil for driving the arm. A magnetic disk drive having a motor, wherein the two sets of magnetic recording disk assemblies are accessed by the magnetic head attached to both ends of one of the arms, and the one voice coil motor accesses the two sets of magnetic recording disk assemblies. A magnetic disk device that rotates around its center.