JPS58200479A - Rotating driving device of disc shaped recording medium - Google Patents

Abstract

PURPOSE:To attain sure loading/unloading of a flexible magnetic disc and the like to a rotating body with easy operation without a complicated constitution, by clamping a hub of a disc shaped recording medium to the rotating body by means of an electromagnetic force. CONSTITUTION:A motor is constituted with an armature coil 20 and a magnet 19 of the rotating body 14 opposing to the coil 20 and the rotating body 14 is rotated incorporatedly with a shaft 10. In this rotating body 14, only a ring shaped section 18 provided opposingly to a ring shaped magnetic substance 17a of the hub 16 of a magnetic disc 15 is formed as a nonmagnetic substance, the other parts is formed as magnetic substance, and when power is applied to the coil 20, the hub 16 is linked and fixed to the rotating body 14 via the magnetic substance 17a and the like by means of electromagnetic adsorption. Thus, the loading/unloading between the rotating body and the flexible magnetic disc is executed surely with easy operation and a simple constitution without requiring any rotating clamping plate or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational drive device for rotationally driving a disk-shaped recording medium such as a flexible magnetic disk.

A flexible magnetic disk drive device is used as an external storage device for a heater. The flexible magnetic disk, which is the storage medium of this device, is a thin coaxial magnetic disk protected by a rectangular flexible jacket, but in recent years other types of magnetic disks have been developed. Flexible magnetic disks, in which the central part of the tape is held by a... and the magnetic disk is loaded into a solid cartridge instead of a flexible jacket, are becoming popular. The present invention particularly seeks to provide a device suitable for rotationally driving the latter flexible magnetic disk.

In general, a flexible magnetic disk is a medium that can be exchanged with a flexible magnetic disk drive, so a clamp device is required to attach and remove the flexible magnetic disk within the flexible magnetic disk drive.

Figures 1 and 2 show side cross sections of an embodiment of a conventional flexible magnetic disk rotary drive device, with Figure 1 showing the clamped state and Figure 2 showing the state before clamping. There is. The flexible magnetic disk 1 is held at its inner periphery by a disk 2, and the flexible magnetic disk 1 and the hub 2 are rotatably loaded into a solid cartridge 3.

When the flexible magnetic disk 1 is mounted on a rotary drive device, the rotating shaft 4 of the rotary drive device is inserted into the center hole 2d of the hub 2, as shown in FIG. being touched.

Further, the disk clamper 6 in the rotary drive device and the bearing 7 press-fitted therein are supported by a rotating clamp plate 8 that can rotate in the directions of arrows A and B, and the lower end surface of the disk clamper 6 is The flexible magnetic disk 1 is pressed against the upper end surface of the hub 2, and the flexible magnetic disk 1 is held between the rotating body 6 and rotated stably. Further, when ejecting the flexible magnetic disk 1 from the rotary drive device, the rotary clamp plate 8 rotates in the direction of arrow B, and the disk clamper 6
By separating the flexible magnetic disk 1 from the hub 2, the flexible magnetic disk 1 can be ejected.

However, in such a configuration, when the flexible magnetic disk 1 is attached and the rotating body 5 rotates, the bearing 7 also rotates, so an extra load torque is generated there.
Moreover, rotational unevenness is imparted to the flexible magnetic disk 1.

Furthermore, when loading and unloading the flexible magnetic disk 1, the disk clamper 6 must always be raised by the rotating clamp plate 8, and the height 2 must be provided within the rotary drive device. There have been problems in that the flexible magnetic disk has become larger and more complex, and it has been difficult to attach and detach the flexible magnetic disk to and from the rotating body.

The present invention clamps a disk-shaped recording medium such as a flexible magnetic disk to a rotating body without using the rotary clamp plate 8 having the disk clamper 6 as described above, and, of course, It is an object of the present invention to provide a rotational drive device that can be easily attached to and detached from a rotating body. The present invention will be described below with reference to FIGS. 3 and 4 using an example in which a flexible magnetic disk is used as the disk-shaped recording medium.

Figure 3 shows a flexible magnetic disk (hereinafter referred to as j71-
1 is a side sectional view of an embodiment of the present invention in a state in which a magnetic disk (hereinafter referred to as a magnetic disk) is attached. In the figure, 1o is a rotating shaft rotatably supported via a ball bearing 13 on a bearing 12 attached to a magnetic pace 11;
4 has a magnetic disk hub (described later) placed on the upper surface 11J
This rotating body is attached to the rotating shaft 1o so as to be able to rotate integrally therewith. Note that when the hub 16 of the magnetic disk 16 is placed on the V of the rotating body 14, the ring-shaped magnetic body 17a (also &-j
: 17b) is the link-shaped non-magnetic body 18, and the rotating body parts 14a and 14b are located on the outer circumferential side and the inner circumferential side of the link-shaped non-magnetic body 18. is made of magnetic material-C-structure 1.

FIG. 4 shows a partially cutaway perspective view of the 1) No. 51 quadrupling body 14.

Further, a ring-shaped magnet 19 magnetized in the thickness direction is attached to one side near the outer periphery of the rotating body portion 14a of the rotating body 14. This magnet 19 is
A drive source that rotationally drives the front rotating shaft 1o and the rotating body 14, including the armature coil 2o that is fixedly disposed on the lower surface of the magnet 19, that is, on one side of the base 11 facing the magnetized surface. It makes up the motor that makes up the.

A dotted line G shown in FIG. 3 indicates the magnetic circuit of the motor for generating rotational torque.

21 is a rotating shaft 10 below the ring-shaped non-magnetic body 18.
A ring-shaped coil 22 arranged concentrically with the coil 21 surrounds the coil 21 and has an open end (F end) located on the outer circumferential side and the inner circumferential side of the ring-shaped non-magnetic body 18. Opposed to the body parts 14a and 14b with a predetermined gap therebetween is a ring-shaped coil holder made of a magnetic material fixedly arranged on the base 11.
are arranged concentrically. Here, in the coil 2 and the coil holder 22, when the coil 21 is energized, a magnetic circuit shown by the dotted line H is formed, and the magnetic body 17a of the rotating body 14-to-P1.6 is energized. .

The attraction force due to magnetic force is applied to the rotating body 14.
An electromagnetic clamping means is configured to attract in the direction of and clamp the rotationally transmittable member. Therefore, the ring-shaped magnetic body 17a (or 17b) attached to the pulley 16 is located on the outer and inner circumference sides of the ring-shaped non-Ie magnetic body 18 of the rotating body 14. Rotating body parts 14a and 1
4b, the width W of the ring-shaped magnetic body 17a (17b) is the same as that of the ring-shaped non-magnetic body 1.
It is preferable to make the width W2 larger than the width W2 of No. 8 so that a strong electromagnetic attraction force by the electromagnetic clamping means No. 111 acts on the ring-shaped magnetic body 17a (17b) No. 11. In addition, in order to ensure that the rotation of the rotating body 14 (and therefore the rotational force is transmitted to the hub 16 and therefore the magnetic disk 16), at least one of the rotating body parts 14a and 14b is...
The ring-shaped magnetic body 17a (17b) of the hub 16 is always in contact with the end face of the hub 16 including the ring-shaped magnetic body 17a (17b), and the rotating body parts 14a, 14b. It is convenient to expand the frictional resistance of the contact portion with the upper surface of the rotating body 14 including the ring-shaped non-magnetic material 18 by increasing the frictional resistance.

In addition, in FIG. 3, 23 indicates the position where the rotating shaft 1o is inserted l1f1.
The center hole 24 of the hub 16 is a NoriRad type cartridge that houses the magnetic disk 16, which is held by a fixed portion of the device 6 by suitable means.

As is clear from the description below, the rotary drive device of the present invention is configured to clamp the hub of the disk-shaped recording medium to the rotating body using the 'tjila force.
Compared to conventional methods that use a disc clamper or rotating clamp plate to clamp the bar between the rotating body and the rotating body, no extra load torque is applied, and the disc-shaped There is no unevenness in the rotation of the recording medium.

Moreover, the structure is simple, the device can be made thinner, and the operation of attaching and detaching the disk-shaped recording medium to and from the rotating body is extremely easy. In particular, when a magnet is attached to a rotating body and the rotating body is used as a component of a rotational drive source, as in the example described in ml, it is possible to reduce the number of parts and further simplify the structure. This makes it more effective.

In addition, in the present invention, the electromagnetic clamping means is operated (energized) in conjunction with detecting the position of the disk-shaped recording medium on the rotating body, or in conjunction with the on/off of energization to the rotational drive source of the rotating body. It is also possible to turn on and off automatically.

[Brief explanation of the drawing]

1 and 2 are side sectional views of main parts of a conventional rotary drive device for a flexible magnetic r-isk in an operating state and a non-operating state, and FIG. 3 is a side sectional view of main parts of an embodiment of the present invention. FIG. 4 is a partially cutaway perspective view of the rotating body in the same embodiment. 1o...rotation axis, 11...base, 1
4... Rotating body, 14a, 14b... Rotating body part, 16... Magnetic disk, 16...
... No. 1, 17a, 17b ... Ring-shaped magnetic material, 18 ... Ring-shaped non-magnetic material, 19 ...
...Magnet, 20...Armature coil,
21... Coil, 22... Coil holder, 23... Center hole.

Claims (3)

[Claims] (1) A rotating shaft inserted into the center hole of the hub of a disk-shaped recording medium to which a knob having a magnetic material is attached to at least a part of the end surface, and a rotating shaft that supports the knob and supports the rotating shaft. a rotating body that is rotationally driven by a drive source so as to be able to rotate together with the rotating body; and a disk-shaped recording medium that is disposed below the rotating body and placed on the rotating body when energized. Rotation of a disk-shaped recording medium characterized by comprising an electromagnetic clamping means for applying a magnetic force to the body in a direction to press the knob against the rotating body! Drive device. (2) When the rotating body has a disk-shaped recording medium placed on it, a part of the part where the magnetic body is located is made of a ring-shaped magnetic body formed of a non-magnetic body. The electromagnetic clamp means includes a coil disposed below the ring-shaped non-magnetic material, and a coil surrounding the coil, the open ends of which are located on the outer and inner periphery sides of the link-shaped non-magnetic material of the rotating body. Claims characterized in that the structure includes a ring-shaped coil holder made of a magnetic material disposed on the fixed part so as to face a rotating part made of a magnetic material located at a predetermined gap. A rotational drive device for a disk-shaped recording medium according to item (1). (3) Claim (1) characterized in that the rotating body is provided with a rotor magnet of a motor that constitutes a drive source for rotationally driving the rotating body.
A rotational drive device for a disk-shaped recording medium according to item (2) or item (2).