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Disclosed is a process for eliminating thermal and shock shifting of the disks in a hard disk file assembly by means of laser weldment.
English (United States)
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Disk Shift Elimination by Laser Welded Assembly
Disclosed is a process for eliminating thermal and shock shifting of the disks
in a hard disk file assembly by means of laser weldment.
Typically, in a spindle assembly, multiple disks and spacers are stacked on a
DC motor and held in place by means of a clamp ring, screwed or shrunk fit to
the hub of the motor. Each junction between disks and spacers can, in thermal
and shock testing, shift relative to each other. This detrimentally affects Track
However, by aligning the disks 1 and spacers 2 via the inside diameters (see
Fig. 1), and laser welding in three areas 3 along the length of the bore, the stack
then effectively behaves as a single unit. Subsequently, the assembly 4 (see
Fig. 2) may be fitted to a DC motor 5 and again laser welded top and bottom in
three areas 6 at the disk motor interface to complete the spindle/motor assembly.