Dynamic magnetic information storage or retrieval – Record medium – In container
Reexamination Certificate
1994-07-14
2001-12-25
Letscher, George J. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record medium
In container
Reexamination Certificate
active
06333833
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates generally to computer memory and more specifically to removable hard disk cartridges and disk drives.
2. Description of the Prior Art
The popularity of personal computers is, in part, fueled by the ever decreasing costs of such systems. The component manufacturers which supply parts to the personal computer manufacturers are under increasing pressure to reduce their costs to keep up with the ever shrinking profit margins. The hard disk memory, such as fixed disk and removable disk, in a personal computer system represents a major cost included in such systems.
The manufacturers of hard disk drives have therefore been exploring ways to reduce their costs. A principal part of the cost of fabricating a hard disk drive, and/or removable cartridge, is the machining and assembly costs involved. When unit costs were much higher, the machining of various critical parts for hard disk memories seemed insignificant. Now, machining of metal parts represents a significant cost in disk drive and cartridge manufacturing.
Less expensive components and manufacturing methods are therefor critical to competitors in the personal computer and hard disk drive industries.
SUMMARY OF THE PRESENT INVENTION
It is therefore an object of the present invention to provide a hard disk cartridge that is inexpensive to manufacture.
It is an object of the present invention to provide hard disk cartridge that provides good performance.
Briefly, a hard disk assembly embodiment of the present invention comprises a hub made of injection molded liquid crystal plastic, to which is mounted a magnetic disk by a twist-lock screw top.
An advantage of the present invention is that a hard disk hub is provided that is inexpensive to manufacture.
Another advantage of the present invention is that a hard disk assembly is provided that is useful in a removable hard disk cartridge application.
A still further advantage of the present invention is that a cartridge disk is provided that permits automated manufacturing techniques to be used for mounting the disk to the hub.
Another advantage of the present invention is that a hard disk assembly is provided in which the expensive step of machining the critical hub component is avoided because acceptable finished component tolerances can be achieved with liquid crystal plastic when simply injection molded.
These and other objects and advantages of the present invention will no doubt become obvious to those of ordinary skill in the art after having read the following detailed description of the preferred embodiment which is illustrated in the drawing figures.
REFERENCES:
patent: 3917068 (1975-11-01), Cheney
patent: 4847826 (1989-07-01), Sakaguchi et al.
patent: 4904364 (1990-02-01), Davis et al.
patent: 4928032 (1990-05-01), Skoch et al.
patent: 5122078 (1992-06-01), Davis et al.
patent: 5179607 (1993-01-01), Sellers et al.
patent: 5243481 (1993-09-01), Dunckley et al.
patent: 5805379 (1998-09-01), Bordes
patent: 125879 (1992-04-01), None
Bordes Jacques
Frouin Marc
Blakely & Sokoloff, Taylor & Zafman
Letscher George J.
Nomai S.A.
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