Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
1995-10-10
2001-12-04
Ometz, David L. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
C360S098070
Reexamination Certificate
active
06327115
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates in general to a disk drive apparatus attachment structure and attachment method, and more particularly, to a disk drive apparatus attachment structure and attachment method for attaching a spindle motor and disks to a disk drive apparatus.
2. Description of Related Art
Recently, in disk drive apparatuses such as hard disk drives, it is generally seen as a product lineup to use one and the same enclosure case and to provide products with a single disk enclosed in the enclosure case and products with two (or more) disks enclosed in the enclosed case. In these disk drive apparatuses, since a mechanical resonance frequency of the enclosure case greatly affects the stability of its head during track following, a mechanical resonance frequency must be so designed as to be the same for the one-disk version as for the two-disk (or not less than three) version.
For this reason, in conventional disk drive apparatus attachment structures, there are, for instance, two types: one where a two-disk version is set in the basic design and one dummy disk is added for the one-disk version; and the other where the shaft rigidity of the spindle motor for the one-disk version is deliberately lowered to be the same as for a two-disk version.
However, on the one hand, since originally unnecessary parts come to be used as dummy disks, the number of parts increases, thereby causing waste. On the other hand, to change the shaft rigidity of the spindle motor results in the provision of several types of parts which dispense originally with one type.
In this way, conventional disk drive apparatus attachment structures have problems in that the cost increases and the number of parts to be controlled becomes larger.
It can be seen then that there is a need for a disk drive apparatus attachment structure, a disk drive apparatus, and a disk drive apparatus attachment method wherein, even when varying the number of disks, the instability of the track following of the magnetic head can be prevented using one and the same enclosure case in a product lineup.
SUMMARY OF THE INVENTION
To overcome the limitations in the prior art described above, and to overcome other limitations that will become apparent upon reading and understanding the present specification, the present invention discloses a disk drive apparatus attachment structure and attachment method for attaching a spindle motor and disks to a disk drive apparatus.
The present invention solves the above-described problems by providing an attachment structure and attachment method which prevents instability of the track following of the magnetic head using one and the same enclosure case in a product lineup, even when the number of disks varies.
A system in accordance with the principles of the present invention comprises a spindle motor that drives a shaft at a predetermined rotational speed, at least one disk with an inner periphery fixed on the shaft of said spindle motor, at least one head for writing or reading information while following a track of said disk, and a disk drive apparatus attachment structure for attaching the spindle motor and the disk to the disk drive apparatus. An artificial movement model is used to predicate a mechanical resonance frequency determined by the coupling of the pitching mode mechanical resonance frequency of a no-load spindle motor and the primary mechanical resonance frequency of one disk to be loaded and a mechanical resonance frequency determined by the coupling of the pitching mode mechanical resonance frequency of the no-load spindle motor and the primary mechanical resonance frequency of a plurality of disks to be loaded. Further, a spindle motor and a disk are selected based on the predicted values so that the difference in the mechanical resonance frequency determined by coupling for each number of disks loaded may be minimized independently of the number of disks loaded.
An aspect of the present invention is that the step of adjusting parameters is based on the parameters obtained from a free vibration model with a spring-mass system such that a pair consisting of the pitching mode mechanical resonance frequency of a no-load spindle motor and the primary mechanical resonance frequency of the disks loaded is transformed so that the mechanical resonance frequency determined by coupling the pitching mode mechanical resonance frequency of a disk loading spindle motor with the primary mechanical resonance frequency of disks to be loaded does not differ whether one disk or a plurality of disks are loaded.
Another aspect of the present invention is that said shaft assembly is made into a cartridge-like subassembly by previously applying axial opposingly directed preloads to the outer and inner rings of the bearing.
Still another aspect of the present invention is that the spindle motor and disks are chosen so that the variance in the mechanical resonance frequency whether one or a plurality of disks are load is minimized.
Yet another aspect of the present invention is that stable track following can be secured independently of the number of disks loaded.
These and various other advantages and features of novelty which characterize the invention are pointed out with particularity in the claims annexed hereto and form a part hereof. However, for a better understanding of the invention, its advantages, and the objects obtained by its use, reference should be made to the drawings which form a further part hereof, and to accompanying descriptive matter, in which there is illustrated and described specific examples of an apparatus in accordance with the invention.
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patent: 5200866 (1993-04-01), Frugë et al.
patent: 5305163 (1994-04-01), Holm
patent: 5379171 (1995-01-01), Morehouse et al.
patent: 5479304 (1995-12-01), Morita
patent: 5483397 (1996-01-01), Gifford et al.
patent: 5530602 (1996-06-01), Boutaghou et al.
patent: 55157166 (1980-12-01), None
patent: 1312771 (1989-12-01), None
Albrecht David
Frees Gregory
Kitahori Hiroki
Nemoto Sunao
Sasaki Masakazu
Altera Law Group LLC
International Business Machines - Corporation
Ometz David L.
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