JP2641453B2 - Magnetic disk drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a magnetic disk device used as a random access file device or the like of an electronic computer, and particularly to a head positioning mechanism for a multi-positioner. It is installed in the apparatus via the absorbing means to prevent the magnetic disk from being vibrated due to a mechanical reaction at the time of driving the carriage structure, thereby improving the head positioning accuracy with respect to the magnetic disk by the multi-positioner method. In a disk enclosure type magnetic disk device configuration in which a head positioner including a magnetic disk component, a carriage component, and a driving magnetic circuit portion for driving the carriage component is housed in a container, Carriage component drive The upper and lower surfaces of the magnetic circuit portion in the housing housing attenuate vibration in the head drive access direction and reduce a moment acting to rotate and swing in a direction perpendicular to the head drive access direction. The shear damper, both side surfaces are bent only in the head drive access direction, and are supported in a suspended state via a plurality of elastic members that are not displaced in a direction perpendicular to the head drive access direction and in a vertical direction.

[Industrial applications]

The present invention relates to an improvement of a magnetic disk device used as a random access file device or the like of a computer, and in particular, eliminates vibration to a magnetic disk due to a mechanical reaction at the time of driving a carriage structure in a multi-positioner. The present invention relates to a device structure that prevents a decrease in head positioning accuracy.

In a disk enclosure type magnetic disk drive,
Recently, large capacity and high speed have been rapidly promoted, and in particular, the storage capacity of magnetic disks per spindle has been increased. Therefore, a multi-positioner method has been frequently used to avoid contention for access to these magnetic disks. In such a magnetic disk drive, the magnetic disk is vibrated by a mechanical reaction when one of the carriage components in the multi-positioner is driven, and the head positioning accuracy of the other carriage component with respect to the magnetic disk is reduced. Tend.

Therefore, there is a demand for a configuration in which such a vibration to the magnetic disk is prevented by a simple configuration, and the head positioning accuracy is improved.

[Conventional technology]

Conventional multi-positioner type magnetic disk drives
For example, as shown in FIG. 4, a magnetic disk assembly 11 in which a plurality of magnetic disks 13 are mounted on a spindle 12 and a magnetic head 16 supported via a head arm 17 on a carriage body 15 having moving coils, respectively. The head positioner 14 and the like in which the two carriage components 18 and 19 are combined with the driving magnetic circuit section in the housing housing 20, etc., are contained in a base body 22 having a spindle rotation motor 21 and a sealed container 23. It has a stowed configuration.

[Problems to be solved by the invention]

Incidentally, in the above-described conventional apparatus configuration, a plurality of magnetic disks 13 mounted on the spindle 12 are
The two carriage components 18, 19 can be accessed independently of each other, and there is a great advantage that high efficiency of recording / reproduction can be realized. On the other hand, for example, one of the carriage components 18 in the head positioner 14 is driven and accessed. The reaction of the time propagates through the base body 22 and the spindle 12 through the housing 20, and vibrates the magnetic disks 13.

The magnetic head by the other carriage structure 19 which has already accessed the corresponding magnetic disk 13 by the vibration
The two carriage structures 18, 19, such that the access target position of the head 16 fluctuates and the positioning accuracy of the head 16 decreases.
There is a phenomenon in which mutual interference of mechanical vibrations occurs.

Such a mutual interference of the mechanical vibrations has a disadvantage that the vibrations are particularly remarkable at the resonance point of the spindle, and the head positioning accuracy of the head positioner 14 with respect to the magnetic disk 13 is remarkably deteriorated.

In view of the above-mentioned conventional disadvantages, the present invention provides a magnetic circuit, which is a component of the head positioner, in a device via a vibration damping means, so that a magnetic reaction to a magnetic disk due to a mechanical reaction at the time of driving the carriage structure is performed. It is an object of the present invention to provide a novel magnetic disk drive that prevents vibration and improves the head positioning accuracy for a magnetic disk by a multi-positioner method.

[Means for solving the problem]

In order to achieve the above object, the present invention provides a head positioner including a magnetic disk component on which a plurality of magnetic disks are mounted on a spindle, a carriage component, and a driving magnetic circuit for driving the carriage component in a container. In the disk enclosure type magnetic disk device configuration housed in the head housing, the magnetic circuit portion for driving the carriage structure constituting the head positioner is housed in a housing housing, the upper and lower surfaces of which attenuate the vibration in the head drive access direction, and A plurality of shear dampers for relaxing a moment acting to rotate and swing in a direction orthogonal to the head drive access direction, both side surfaces bend only in the head drive access direction, and in a direction perpendicular to the head drive access direction and in a vertical direction. Is supported in a suspended state through a plurality of non-displaceable elastic members. And dynamic prevention structure.

(Operation)

In the magnetic disk drive of the present invention, since the magnetic circuit unit for driving the carriage structure is housed in the housing in a suspended state, the force (shear direction) in the drive access direction (X direction) of the carriage structure is affected. In addition, a plurality of shear dampers supporting the upper and lower surfaces of the magnetic circuit portion function as dampers, and the dampers are pulled by a moment to rotate and swing around a Y direction orthogonal to the driving access direction (X direction). -It also exerts the effect of reinforcing elastic members such as leaf springs under compression.

On the other hand, an elastic member such as a plurality of leaf springs supporting both side surfaces of the magnetic circuit portion in the housing is bent only in the drive access direction (X direction) of the carriage structure with respect to the magnetic circuit portion. There is no displacement in the Y direction and the vertical direction (Z direction) perpendicular to the (X direction), and the support accuracy can be ensured.

Therefore, for example, of the vibrations that propagate to the magnetic disk due to the reaction when one of the carriage components is driven and accessed among the two carriage components in combination with the magnetic circuit portion, the resonance point of the spindle includes the resonance point of the spindle. Since the vibration frequency component is effectively attenuated, interference of mechanical vibration between the carriage components is significantly reduced, and the head positioning accuracy with respect to the magnetic disk by the multi-positioner method can be improved.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view of a principal part conceptually showing an embodiment of a vibration preventing installation structure of a magnetic circuit section for driving a carriage structure in a head positioner of a magnetic disk drive according to the present invention.

In the figure, reference numeral 31 denotes a magnetic circuit including a magnet 31a and a yoke 31b for driving and accessing the two carriage members 18, 19, and the magnetic circuit 31 has an entrance of the carriage members 18, 19 as shown. For example, in the storage housing 20 installed on the base body 22, for example, four shear dampers 32 at upper and lower portions thereof and elastic members 33 made of leaf springs at upper and lower sides of both side surfaces are respectively provided. It is fixed in a form that is suspended in the air.

More specifically, as shown in FIG. 2, the support and fixing structure includes the magnetic circuit 31 in the storage housing 20 and a drive access direction (shearing direction) indicated by arrows of the carriage members 18 and 19 in the vertical direction. Direction) and acts as a damper, and eight shear dampers 32 each including a rubber material interposed to relieve tension / compression due to a moment to rotate and swing around a Y direction orthogonal to the drive access direction (shear direction) The vibration resonance points on both sides thereof are determined by the mass of the magnetic circuit 31, the thickness of the leaf spring, and the length and width of the beams thereof, etc., so as to be lower than the vibration resonance point of the spindle equipped with the magnetic disk (not shown). An elastic member 33 composed of eight leaf springs each having an appropriate spring constant is interposed and supported in a suspended manner in a vibration-proof structure.

In this way, the reaction when the carriage structure 18 or 19 is driven and accessed is greatly reduced from propagating to the base body 22 and the spindle (not shown) via the receiving housing 20, and the positioner driving current / disk shown in FIG. As shown in the relationship diagram between the vibration acceleration and the carriage drive frequency, in particular, among the vibrations propagated to the spindle, a resonance frequency component higher than the vibration resonance point of the leaf spring 33 having the spring constant, that is, a dashed line A Since the conventional high resonance frequency component shown is significantly attenuated as shown by the solid line B, vibration to each magnetic disk mounted on the spindle is prevented, and each carriage configuration in the positioner at the time of drive access is performed. Mutual interference of mechanical vibration between the bodies 18 and 19 is eliminated.

In the above-described embodiment, an example in which a multi-positioner is used as a head positioner has been described. However, the present invention can be applied to a general positioner that does not use the multi-positioner method, and similar effects can be obtained.

〔The invention's effect〕

As is apparent from the above description, according to the magnetic disk drive of the present invention, the magnetic circuit, which is a component of the multi-head positioner, is installed in a suspended state in the housing via the vibration damping means. In addition to preventing the magnetic disk from being vibrated due to mechanical reaction at the time of driving access of the plurality of carriage structures,
Mutual interference of mechanical vibration between the carriage structures is also eliminated.

Therefore, excellent effects such as an improvement in head positioning accuracy with respect to the magnetic disk can be obtained.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part conceptually showing an embodiment of a vibration preventing installation structure of a magnetic circuit unit for driving a carriage structure in a magnetic disk device according to the present invention, and FIG. FIG. 3 is a perspective view of a main part specifically showing an embodiment of a vibration preventing installation structure of a magnetic circuit unit for driving a carriage structure in FIG. 3, FIG. 3 is a diagram showing a relationship between a positioner driving current / disk vibration acceleration and a carriage driving frequency. FIG. 4 is a sectional view of a main part for explaining a conventional magnetic disk drive. 1 and 2, reference numerals 18 and 19 denote a carriage structure, 20 denotes a housing housing, 22 denotes a base body, 31 denotes a magnetic circuit, 32 denotes a shear damper, and 33 denotes an elastic member.

Continuation of front page (72) Inventor Keiji Ariga 1015 Uedanaka, Nakahara-ku, Kawasaki City, Kanagawa Prefecture Inside Fujitsu Limited (56) References JP-A-58-23362 (JP, A) U) Japanese Utility Model Showa 60-111558 (JP, U) Japanese Utility Model Showa 58-77874 (JP, U)

Claims (1)

(57) [Claims] 1. A disk enclosure type magnetic disk device configuration in which a head positioner comprising a magnetic disk component, a carriage component, and a drive magnetic circuit for driving the carriage component is housed in a container. A magnetic circuit portion for driving the carriage structure is housed in a housing, and upper and lower surfaces thereof attenuate vibration in a head drive access direction and act to rotate and swing in a direction orthogonal to the head drive access direction. A plurality of shear dampers, both sides of which are bent only in the head drive access direction and are suspended in a suspended state through a plurality of elastic members which are not displaced in a direction perpendicular to the head drive access direction and in a vertical direction, respectively. A magnetic disk drive characterized by the above-mentioned.