JPS63259881A - Disk-shaped recording medium and rotary driver for said recording medium - Google Patents

Abstract

PURPOSE:To ensure the highly accurate revolutions of a recording medium and also to obtain a compact rotary driver for recording medium, by securing the connection between the metallic part of a hub of the recording medium and a coupling hole formed at a position distant from the center of said metallic part and a pin set on an end face of a spindle. CONSTITUTION:A coupling hole 2b is formed at a position distant by a prescribed distance from the center of a metallic part 2a of a hub 2 of a magnetic recording medium 1. Then a pin 3b set on an end face of a spindle 3 is coupled to the hole 2b. The part 2a is attracted by a magnet plate 3a attached to the tip face of the spindle 3. In this case, the magnetic force produced between the plate 3a and the part 2a is effective for attraction even in case the pin 3b is not coupled to the hole 2b. Thus the revolving accuracy is maintained just with the accuracy of the outer diameter of the spindle 3 and the inner diameter of the hub 2. As a result, a compact rotary driver is obtained for a disk-shaped recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a disk-shaped recording medium and a disk-shaped recording medium rotation drive device that rotationally drives the disk-shaped recording medium.

(Prior Art) Conventionally, in this type of disk rotation drive device, when a magnetic disk is rotationally driven as in a magnetic disk device, for example, a center hole is provided in the center of the magnetic disk 28 as shown in FIG. 9a. 29 is provided, and is fitted with a spindle hub 31 provided at the tip of a spindle shaft 30 of a motor (not shown) for rotationally driving the magnetic disk 28, and by rotating the spindle @30, the magnetic disk 28 is rotationally driven. Was.

Further, as shown in FIG. 9b, a metal Tee and C hub 33 are provided in the center of the magnetic disk 32, and the magnetic disk 32 is
The tip portion 3 is attached to the spindle 1lith34 in relation to the spindle shaft 34 of a motor (not shown) which is used to rotationally drive the spindle 1lith34.
A spindle hub 35 is provided so that the spindle hub 4a protrudes. The spindle hub 35 is provided with a magnetic net 36 and a disk drive pin 37 on the circumference of the hub. 3
3a and sub-hole 33b, and are attracted by the magnet 36, and the spindle! 1illI34
By rotating the magnetic disk 32, the magnetic disk 32 was driven to rotate.

[Problem that the invention seeks to solve]

However, in the conventional example shown in FIG. 9a, the accuracy of supporting the center of the magnetic disk 28 changes depending on the position of the center hole 29 of the magnetic disk 28, or the magnetic disk of If the material is flexible, the portion around the center hole 29 lacks durability, and there is a risk that the viscosity supporting the center of the magnetic disk 27 may deteriorate due to changes over time.

Further, the conventional example shown in FIG. 9b is effective when the diameter of the disk hub 33 is larger than the diameter of the spindle shaft 34, but if the diameter of the disk hub 33 is small,
Correspondingly, the spindle hub 35 becomes smaller, and when the diameter of the spindle hub 35 and the diameter of the spindle shaft 34 are approximately the same, the disk drive pin 37
In addition, since it is composed of two parts, the spindle shaft 34 and the spindle hub 35, in order to increase the accuracy of supporting the magnetic disk 32, it is necessary to improve the dimensional accuracy and assembly granularity of the parts. It was difficult to achieve low cost.

The present invention has been made to solve the above-mentioned problems, and in addition to solving the above-mentioned problems, it also achieves low cost and miniaturization, and supports a disk-shaped recording medium with high grain size.
It is an object of I
"Target."

[Means for solving problems]

For this reason, the disk-shaped recording medium of the present invention has a hub member that has an engagement portion with a rotary drive device only at a position other than the center point of the navigation recording medium in the center of the navigation recording medium. It is prepared for.

Further, the disk-shaped recording medium rotation drive device of the present invention uses a disk-shaped recording medium that is provided with a hub member in the center of the recording medium that has an engaging portion only at a position other than the center point of the disk-shaped recording medium. The device has an engaging member that engages with the engaging portion on a surface facing the hub member, and the device has an engaging member that engages with the engaging portion on a surface facing the hub member, and the nir The disc-shaped recording medium is provided with a rotational drive means for rotationally driving the disc-shaped recording medium.

[Effect]

1- In the configuration described above, by using the hub member that has the engagement portion of the rotary drive device only at a position other than the center point of the disk-shaped recording medium, it is possible to reduce the size of the disk-shaped recording medium and to ensure that the disk It is possible to support a shaped recording medium and perform rotational driving.

〔Example〕

Hereinafter, the present invention will be explained based on examples.

Note that the present invention will be explained here by taking a magnetic disk device to which the present invention is applied as an example.

FIG. 1 is a diagram showing a first embodiment of a magnetic disk in a magnetic disk device to which the present invention is applied, in which (a) is a top view, (b) is a side view, and (C) is a bottom view.

In FIG. 1, ``■'' is a magnetic disk as a magnetic recording medium coated with a magnetic material, 2 is a disk hub provided at the center of the magnetic disk, and the disk hub 2 is a spindle (described later). A metal part 2a is installed on the surface facing the tip of the disk hub 2, and the metal part 2a has an engagement hole 2b that engages with an engagement pin 3b provided on the spindle shaft 3, which will be described later. is located a predetermined distance from the center of the

FIG. 2 shows the shape of the tip of the spindle shaft that engages with the magnetic disk and transmits rotational driving force in the drive motor of the magnetic disk drive shown in FIG. 1 that rotates the magnetic disk. There is a diagram.

In FIG. 2, 3 is a cylindrical spindle shaft, and a magnet 3a is placed in the center of the shaft on the same plane as the tip.
On the same surface as the magnet 3a, an engaging pin 2b that engages with the engaging hole 2b is provided at a position a predetermined distance apart from the center of the spindle shaft.

FIG. 3 is an exploded perspective view of the jacket that holds the magnetic disk shown in FIG. 1.

In FIG. 3, 4 is a nonwoven fabric for removing dirt from the magnetic disk 1 by sandwiching the magnetic disk 1 from above and below and for preventing the waving phenomenon that occurs during rotation; 5 is a nonwoven fabric on the upper surface of the magnetic disk 1;・Opening window 5 so that the part is exposed
an upper jacket provided with a window 6a; a lower jacket provided with a window 6a; 7 is a shutter for opening and closing the opening windows 5a, 6a of the upper and lower jackets 5.6. A magnetic disk is held in a jacket as described above and loaded into a magnetic disk device.

FIG. 4 is a sectional view showing a state in which the magnetic disk held in the jacket shown in FIG. 3 is loaded into a magnetic disk device. In FIG. 4, the same reference numerals are given to the same parts as those in the above-mentioned figures, and detailed explanations will be omitted.

In FIG. 4, 8 is a jacket holder for holding the jacket, 9a and 9b are positioning members for positioning the jacket holder 8 holding the jacket, and 10 is a base stand of the magnetic disk device for positioning the jacket. Member 9a.

It has a bearing 11 that supports the spindle 9b and rotatably supports the spindle shaft 3. Reference numeral 12 denotes a flyhole, and the spindle shaft 3 is fixedly supported at the center of the flywheel 12, and a magnet 13 is fixed near the circumference of the flyhole 12. Further, a rotational drive coil 14 is fixed to a position on the base 10 facing the magnet 13 fixed to the flywheel 12, and a rotational drive signal is sent to this coil 14 from a rotational drive control circuit (not shown). When supplied, the flywheel 12 rotates around the spindle shaft 3 and drives the magnetic disk 1 to rotate.

Further, FIG. 5 is a diagram showing the relationship between the recording or reproducing section that performs recording or reproduction and the magnetic disk in the magnetic disk device as shown in FIG. 4 above.

In FIG. 5, 15 is a magnetic head that performs recording or reproduction on the magnetic disk 1, 16 is a head carriage that transports the magnetic head 15 in the incoming direction in the figure;
Reference numeral 17 denotes a butt support arm, one end of which is fixed to the head carriage 16 with a screw 18, and a pressing force near the other end for making good contact with the magnetic disk 1 of the magnetic head 15. A pad 19 is provided. Further, 20 is a guide shaft when the head carriage moves in the direction shown in the figure, and the head carriage 16
It is slidably engaged with the engaging portions 16a and 16b of.

Reference numeral 21 denotes a steel belt for transmitting the driving force of a head conveyance motor 22, which will be described later, to the flat carriage 16, and the steel belt 21 is attached to the rotating shaft of the head conveyance motor 22. Pulley 23
It is further fixed to the head carriage 16 by a screw 24, and is connected to the head transport motor 22 during recording or reproduction of the magnetic disk device.
When a control signal is supplied from a head movement control circuit (not shown), the pulley 23 is rotated by the head transport motor 22, and a driving force is transmitted to the helad carriage 16 via the steel belt 21. Then, the helad carriage 16 is moved along the guide shaft 20 in the inward direction in the figure.

'As shown in Figure 4 above, the magnetic disk loaded in the magnetic disk drive and driven to rotate is provided with a shutter attached to the jacket holding the magnetic disk in the jacket holder '18. The magnetic head 15 shown in FIG.
Then, the pressing pad 19 is brought into contact with the head magnetic disk 1, and the head carriage 16 is moved by the head transport motor 22 as described above, thereby recording or reproducing data on the magnetics 1.

As described in the explanation of FIG. 4, the magnetic disk 1 is held in a jacket and loaded into the jacket holder 8 of the magnetic disk device, and the jacket holder 8 is positioned on the base 10 of the magnetic disk device. member 9a,
9b positions the jacket holter 8 at a regular position.

Then, the metal portion 2a of the disk hub 2 is placed in a positional relationship opposite to the tip surface of the spindle shaft 3, and the metal portion 2a is attracted by the magnet 3a installed on the tip surface of the spindle shaft 3. At this time, the engagement hole 2b provided in the metal portion 2a does not necessarily engage with the engagement pin 3b provided on the tip surface of the spindle shaft 3, but the magnetic disk 1 Since the salmon is held with a predetermined play against the throat, even if the engagement pin 3b and the engagement hole 2b are not engaged, the attraction force of the magnet 3a will cause the metal part 2a to Thus, the state in which the engagement pin 3b is in contact is maintained.

After such a state is reached, a rotational drive control circuit (not shown) supplies a rotational drive signal to the rotational drive coil 14 provided on the base 10 of the magnetic disk device, and the flyhole 12 starts rotating. Therefore, the spindle shaft 3 also rotates.

Since the metal part 2a of the magnetic disk 1 is attracted by the magnet 3a provided on the tip end surface of the spindle shaft 3, it tries to rotate with the rotation of the spindle shaft 3, but the magnetic disk 1, after the jacket holder 8 is positioned at a proper position by positioning members 9a and 9b, it is loosely held between a magnetic head 15 and a pressing pad 19 shown in FIG. 5, and rotation of the magnetic disk 1 is prevented. Therefore, the magnetic disk 1 does not rotate, and only the spindle shaft 3 engages with the engaging pin 3b of the metal part 2.
The metal part 2a rotates while sliding in the circumferential direction of the metal part 2a while in contact with the metal part 2a.

Then, the engagement pin 3b engages with the engagement hole 2b provided in the metal portion 2a, and rotates the magnetic disk 1.

FIG. 6 is an explanatory diagram of the related operation between the spindle shaft 3 and the disk hub 2 of the magnetic disk.

]) f "As described above, when the magnetic disk l begins to rotate in the R direction in FIG. 6, the magnetic head 15 and pressing pad 19 shown in FIG. Therefore, a frictional resistance force (μF in the figure) is generated between the magnetic disk 1, the magnetic head 15, and the pressing pad 19 in the tangential direction opposite to the rotational direction R of the magnetic disk 1. Works to prevent rotation.

゛On the other hand, as the spindle shaft 3 rotates, the engagement pin 3b of the spindle shaft 3 engaged with the engagement portion 2b drives the metal portion 2a of the magnetic disk 1 in the direction of T in the figure. When the relationship T>μF is established between the frictional resistance force μF and the rotational driving force T, rotation of the magnetic disk 1 is started.

In addition, when the magnetic disk 1 starts to rotate as described above, while the magnetic disk 1 is rotating, the magnetic head 15
The frictional resistance force μF caused by the pressing pad 19 acts on the magnetic disk 1 in the opposite direction to the rotational driving force T.
The reaction force of the resultant force of the rotational driving force T and the frictional resistance force μF (P in the figure)
+ , P2) is the support surface 2c provided on the inner surface of the disk hub 2.

2d, the position of the disk hub 2 relative to the spindle shaft 3 is automatically fixed at the position B in the figure. The positioning accuracy of the disk hub 2 with respect to the spindle shaft 3 is determined by the accuracy of the outer diameter of the spindle shaft 3 and the accuracy of the inner diameter of the disk hub 2.

As described above, in the above embodiment, since the spindle shaft 3 is configured to directly drive the disk hub 2 of the magnetic disk 1 without providing a special spindle hub etc., the structure of the rotational drive mechanism of the magnetic disk 1 is simplified. In addition, the inner diameter of the disk hub 2 can be made smaller to match the outer diameter of the spindle shaft 3, and the rotation of the magnetic disk can be controlled only by the grain size of the outer diameter of the spindle shaft 3 and the inner diameter of the disk hub 2. Since the support particle size can be determined, it becomes possible to downsize the magnetic disk device and to achieve the rotation support particle size of the magnetic disk.

FIG. 7 is a perspective view of essential parts of a spindle shaft according to a second embodiment of the present invention.

In FIG. 7, 25 is a spindle shaft made of magnetic material, and 25a is an engagement pin. By adopting such a structure, there is no need to attach the magnet 3a to the spindle shaft 3 as in the first embodiment shown in FIG. 2, and the assembly of the apparatus can be simplified.

FIG. 8 is a perspective view of main parts of a spindle shaft and a Te5r hub according to a third embodiment of the present invention.

In FIG. 8, a predetermined portion of the metal portion 26a of the disc hub 26 is punched out in three directions, and a tongue-shaped portion 26b bent at a 110 angle in the F direction is formed at the remaining edge.
At the same time, a magnet 27a is provided at the center of the distal end surface of the spindle @21 facing the metal portion 26a, and a magnet 27a is provided at the center of the front end face of the spindle @21, and a magnet 27a is provided between the tongue portion 26b of the disk hub 26 and the engagement groove 27.
b.

With the above structure, unlike the first embodiment shown in FIG. After the engagement groove 26b and the engagement groove 27b are engaged, the disc hub will not be misaligned with respect to the spindle shaft, so there is no need to provide a support surface as shown in FIG. 6 on the inside of the disc hub. , assembly and processing operations are simplified.

Further, in each of the embodiments described above, the case where the present invention is applied to a magnetic disk device has been explained as an example, but the present invention is not limited to this and can be applied to an optical disk device, etc. It is.

〔Effect of the invention〕

As described above, according to the present invention, a disk-shaped recording medium and a disk-shaped recording medium drive device are capable of reducing cost and size, and can support and rotate the disk-shaped recording medium with high precision. can be provided.

[Brief explanation of drawings]

FIG. 1 is a diagram showing a first embodiment of a magnetic disk in a magnetic disk device to which the present invention is applied, in which (a) is a top view, (b) is a side view, and (e) is a bottom view. FIG. 2 is a diagram showing the shape of the tip of a spindle shaft that engages with the magnetic disk and transmits rotational driving force in the drive motor of the magnetic disk device that rotationally drives the magnetic disk shown in FIG. 1. It is. FIG. 3 is an exploded perspective view of the jacket that holds the magnetic disk shown in FIG. 1. FIG. 4 is a sectional view showing a state in which the magnetic disk held in the jacket shown in FIG. 3 is loaded into a magnetic disk device. FIG. 5 shows a recording or reproducing unit that performs recording or reproducing in a magnetic disk device as shown in FIG.
FIG. 3 is a diagram showing the relationship with a nil magnetic disk. FIG. 6 is an explanatory diagram of the engagement operation between the spindle shaft and the disk hub of the magnetic disk. FIG. 7 is a perspective view of a main part of a spindle shaft according to a second embodiment of the present invention. FIG. 8 is a perspective view of main parts of a spindle shaft and a disk hub according to a third embodiment of the present invention. FIGS. 9a and 9b are perspective views of main parts of a conventional magnetic disk device. l...Magnetic disk

Claims (2)

[Claims] (1) A disk-shaped recording medium, characterized in that a hub member having an engagement portion with a rotary drive device only at a position other than the center point of the recording medium is provided at the center of the recording medium. type recording medium. (2) An apparatus using a disk-shaped recording medium, which includes a hub member in the center of the recording medium that has an engaging portion only at a position other than the center point of the disk-shaped recording medium, the hub member being opposite to the hub member. a rotational drive means having an engaging member that engages with the engaging portion on a surface, and rotationally driving the disc-shaped recording medium by engaging the engaging member with a hub member of the disc-shaped recording medium; A disk-shaped recording medium rotation drive device comprising: