JPH1196660A - Disk type recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a disk type recorder precisely adjustable in unbalance accompanying rotation of a magnetic disk medium assembly and capable of stably holding a weight for adjusting the balance over a long term. SOLUTION: Plural magnetic disks 4 are supported by a flange 8 provided in one end part of a hub 6 and a disk clamper 9 fitted to the other end through spacers 7, and balancing clampers 12, 14 are fitted from both sides in the axial direction of this hub 6, and the weight 13, 15 are held respectively between these balancing clampers 12, 14 and the disk clamper 9 and the flange 8. Since the weight 13, 15 for adjusting the balance are supported in the state held between the balancing clampers 12, 14 and the hub 6, they are supported without adhesive or screws, etc., and the falling-off of the weight due to the deterioration in the adhesive and the looseness of the screws is prevented, and an effect due to out gas from the adhesive on the magnetic disk is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a disk type recording apparatus, and more particularly to a disk type recording apparatus having a mechanism for adjusting the balance of a disk recording medium which is driven to rotate, such as a magnetic disk.

[0002]

2. Description of the Related Art In a recording apparatus having a disk recording medium driven in rotation, for example, a magnetic disk apparatus, it is necessary to hold a magnetic head in contact with or close to the surface of the magnetic disk. Therefore, it is required to stabilize the surface of the magnetic disk by suppressing the imbalance due to the shaft runout generated with the above. Until now,
In a magnetic disk drive, balancing is performed by fixing lead weights on the upper and lower surfaces of a spindle motor with an adhesive in a large-diameter (φ8 to φ14 inch) disk.
In recent years, with the downsizing of the magnetic disk device, the diameter of the magnetic disk has also been reduced, and the influence of unbalance has been reduced. rpm, and the imbalance has to be adjusted again. For this reason, conventionally, a configuration has been proposed in which the rotational balance of a magnetic disk is adjusted to stabilize it. For example, as disclosed in Japanese Utility Model Laid-Open Publication No. 4-35267, a weight corresponding to an unbalance amount accompanying rotation is attached to at least one of a hub member and a clamp member which are driven to rotate while integrally holding a magnetic disk. Techniques for balancing the rotation of a disk have been proposed.

[0003]

In the technology described in this publication, no specific proposal has been made for mounting a weight on a hub member or a clamp member. In this method, a weight is attached to a groove provided in a clamp member or the like with an adhesive, or a weight is fixed in a hole provided in the clamp member or the like with a screw. However, in the mounting method using an adhesive, the adhesive is easily peeled off due to centrifugal force generated by the rotation of the magnetic disk, and the adhesive is easily deteriorated and peeled off with the lapse of time, so that reliability is secured for a long period of time. There is a problem that it is difficult. further,
When an adhesive having a high adhesive strength is used, the magnetic disk may be deteriorated due to outgas from the adhesive component. Also, with the method of attaching the weight to the rotating body with screws, the rotation of the magnetic disk and the accompanying vibrations cause the screw to be loosened over time, ensuring long-term reliability as with the adhesive Difficult to do. In particular, in the above publication, the weight is supported in an exposed state, so that when the adhesive force or the fastening force is lost, the weight is easily dropped. Further, in the above-described conventional technique, since the balance is adjusted with one weight, there arises a problem that it is difficult to adjust the balance with high precision as described later.

SUMMARY OF THE INVENTION An object of the present invention is to provide a disk type capable of adjusting an unbalun caused by rotation of a magnetic disk medium assembly with high accuracy, and stably maintaining a weight for balance adjustment for a long period of time. A recording device is provided.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a disk-type recording apparatus comprising a disk drive which is supported by a hub which is driven to rotate, wherein the hub or a member integrated with the hub is attached to the hub. The balance adjusting weight is interposed between the balancing clamper and the balancing clamper. The balancing clamper is axially attached to the hub, and sandwiches the weight in the axial direction between the balancing clamper and the axial end surface of the hub or a member integrated with the hub. In this case, it is preferable that an air gap is defined between the balancing clamper and the hub or a member integrated with the hub, and the weight is provided and held in the air gap. Further, the hub has a structure in which the disk recording medium is supported in a state of being axially sandwiched between a flange integrally provided at one end thereof and a disk clamper attached to the other end. Preferably, a first weight is sandwiched between the disc clamper and the first balancing clamper, and a second weight is sandwiched between the flange and the second balancing clamper.

According to this configuration, the weight for balance adjustment is supported while being sandwiched between the balancing clamper and the hub or a member integrated with the hub. The support can be carried out without using the adhesive, and the deterioration of the adhesive and the loss of the weight due to the loosening of the screw can be prevented, and the influence of the outgas from the adhesive on the magnetic disk can be prevented.

[0007]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an embodiment in which the present invention is applied to a magnetic disk drive, FIG.
FIG. 3 is a partially exploded perspective view of a main part. In these figures, a fixed shaft 2 is erected on a bracket 1 fixed to a housing or a base of a magnetic disk device (not shown), a spindle motor 3 is built on the fixed shaft 2, and a plurality of The magnetic disk 4 is rotatably supported. That is, two sets of bearings 5 are disposed on the peripheral surface of the fixed shaft 2 at a predetermined distance in the axial direction, and the bearings 5 enable the cylindrical hub 6 to rotate around the fixed shaft 2. Supported. The hub 6
, A plurality of magnetic disks 4 and a plurality of spacers 7 for maintaining an axial interval between the magnetic disks 4 are alternately inserted through respective center holes. Then, the magnetic disk 4 inserted first is brought into contact with an L-shaped flange 8 having a cross-section integrally provided at the lower end portion of the hub 6 in the figure, and its positioning is performed. At the upper end of the hub 6 in the figure, an annular disk clamper 9 having an L-shaped cross section having substantially the same diameter as the spacer 7 is inserted, and the magnetic disk 4 and the spacer 7
In the axial direction, and is fixed to the hub 6 by shrink fitting in that state.

The spindle motor 3 includes a stator 10 fixed to the peripheral surface of the fixed shaft 2 in a region axially adjacent to the bearing 5 and at a position on the inner diameter side of the hub 6. Rotor magnet 1 fixedly supported on the inner surface of the hub 6 at a position around the rotor
And 1. In the spindle motor 3, by energizing the stator 10, the hub 6 integrated with the rotor magnet 511 is driven to rotate around the fixed shaft 2, and is further integrally supported by the hub 6. It goes without saying that the magnetic disk 4 is driven to rotate.

In this embodiment, the upper balancing clamper 12 is inserted from the outside of the disc clamper 9 into the upper end of the hub 6 in the figure, and is fixed to the hub 6 by shrink fitting similarly to the disc clamper 9. The upper balancing clamp 12 has an L-shaped cross section,
An annular space having a rectangular cross section is defined between the disk space and the disk clamper 9. A weight 13 is arranged on a part of the circumference of the gap, and is pressed and held between the disc clamper 9 and the upper balancing clamper 12 in the axial direction. In this embodiment, a lower balancing clamper 14 having an L-shaped cross section is inserted under the flange 8 at a lower end portion of the hub 6 as shown in the figure, and the flange 6 is fixed to the hub 6 by shrink fitting. 8, an annular space having a rectangular cross section is defined, and a weight 15 is disposed on a part of the circumference in the space, and is pressed in the axial direction between the flange 8 and the lower balancing clamper 14. It is pinched.

According to this configuration, when assembling the magnetic disk drive, the magnetic disk 4 and the spacer 7 are alternately inserted into the hub 6 and are flanged by the disk clamper 9 inserted from the upper end of the hub 6 in the figure. 8 so that the disk clamper 9 is held between the hub 6 and the
Thus, a magnetic disk rotating structure in which the magnetic disk 4 is integrally supported on the hub 6 is formed. And
The magnetic disk rotating structure is rotationally driven by the rotational driving force of the spindle motor 3 which is simultaneously configured to measure the imbalance, and an appropriate weight 13 is provided on a part of the circumference of the disk clamper 9 in accordance with the measured imbalance. Is temporarily fixed with an adhesive tape or the like, the upper balancing clamper 12 is inserted into the hub 6 from above, and the weight 13 is fixed and supported by the hub 6 while being sandwiched by shrink fitting. Similarly, after an appropriate weight 15 is temporarily fixed to a part of the circumference of the lower surface of the flange 8, the lower balancing clamper 1
4 is inserted into the illustrated lower end of the hub, and the weight 15 is fixedly supported in a state of being sandwiched between the hub and the flange 8 by shrink fitting. Accordingly, each of the weights 13 and 15 is provided with the disk clamper 9 and the upper balancing clamper 1 respectively.
2, the flange 8 and the lower balancing clamper 14
Are supported in a state of being sandwiched between them, so that the support is possible without using a method such as an adhesive or a screw. This prevents the weight from dropping due to the deterioration of the adhesive or the loosening of the screw, and also prevents the outgas from the adhesive from affecting the magnetic disk.

In this embodiment, the weights 13, 15
Are arranged at both ends in the axial direction of the hub 6, it is possible to adjust the imbalance of the rotating body with high accuracy.
That is, generally, the unbalance amount of the rotating body is balanced by the correction on the two correction surfaces, and the remaining unbalance amount at this time acts as an excitation force in proportion to the square of the rotation speed. Therefore, by performing the balance adjustment at two points as in this embodiment, the above-described excitation force can be reduced and a suitable balance can be obtained. Further, in this embodiment, the disk clamper 9, the flange 8, and the upper and lower balancing clampers 12, 14 for holding the weight have an L-shaped cross-sectional shape, and define a rectangular gap therebetween. Since the weights 13 and 15 are sandwiched in the gaps of the levers, the weights are completely surrounded, and the weights do not fall off due to the centrifugal force generated in the magnetic disk rotating structure or the above-described excitation force. In this embodiment, since the fixing of the upper and lower balancing clampers 12 and 14 has a shrink-fitting structure, only an extremely fine imbalance existing in processing accuracy occurs, and a weight is used. After the balance adjustment, no imbalance occurs by attaching the balancing clamper.

Here, in the present invention, the axial dimension on the outer diameter side of the disk clamper or the flange is formed to be longer, and even if each of the upper and lower balancing clampers has a flat cross-sectional structure, the gap between each of the upper and lower balancing clampers can be reduced. May be formed so that a weight is sandwiched in this space. Alternatively, on the contrary, the disk clamper and the flange may have a flat cross-sectional structure, and the upper and lower balancing clampers may have an L-shaped cross-sectional structure in which a gap can be defined. Further, the flange may be fixed by shrink-fitting a member separate from the fixed shaft.

[0013]

As described above, according to the present invention, a balance adjusting weight is sandwiched between a rotating hub or a member integrated with the hub and a balancing clamper attached to the hub. Since the weight for balance adjustment is supported in a state of being sandwiched between the balancing clamper and the hub or a member integrated with the hub, the weight is supported without using an adhesive or a screw. This makes it possible to prevent the weight from dropping due to the deterioration of the adhesive or the loosening of the screw, and also to prevent the influence of the outgas from the adhesive on the magnetic disk. Further, since the weight is held in a state of being housed in the space defined between the balancing clamper and the hub or a member integrated with the hub, the above-described falling can be more reliably prevented.
Furthermore, by interposing weights between the hub and the balancing clamper at both ends of the hub, the balance can be adjusted with higher precision.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a main part of a disk type recording apparatus according to the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is an exploded perspective view of a main part of FIG. 1;

[Explanation of symbols]

 2 Fixed shaft 3 Spindle motor 4 Magnetic disk 6 Hub 8 Flange 9 Disk clamper 12 Upper balancing clamper 13 Weight 14 Lower balancing clamper 15 Weight

Claims (5)

[Claims] 1. A disk-type recording apparatus comprising a disk driven recording medium supported by a rotating hub, wherein a hub or a member integrated with the hub and a balancing clamper attached to the hub are provided. A disk-type recording device characterized by holding a balance adjusting weight. 2. The balancing clamper is attached to the hub in the axial direction, and holds the weight in the axial direction between the axial end surface of the hub or a member integrated with the hub and the balancing clamper. The disk-type recording apparatus according to claim 1, comprising: 3. A gap is defined between the balancing clamper and the hub or a member integrated with the hub,
3. The disk-type recording apparatus according to claim 2, wherein the weight is mounted and held in the gap. 4. The hub in a state where the disk recording medium is axially held between a flange integrally provided at one end of the hub and a disk clamper attached to and integrated with the other end of the hub. The first weight is held between the disc clamper and the first balancing clamper, and the second weight is held between the flange and the second balancing clamper. The disk-type recording device according to claim 2. 5. The hub is driven to rotate about a fixed shaft, and the hub is rotated by a motor composed of a stator supported by the fixed shaft and a rotor magnet supported by the hub. 5. The disk type recording apparatus according to claim 1, which is driven.