Browse Prior Art Database

Disk Shift Elimination by Laser Welded Assembly

IP.com Disclosure Number: IPCOM000037570D
Original Publication Date: 1989-Mar-01
Included in the Prior Art Database: 2005-Jan-29
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Glaser, TW: AUTHOR [+3]

Abstract

Disclosed is a process for eliminating thermal and shock shifting of the disks in a hard disk file assembly by means of laser weldment.

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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 Misregistration.

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.

Disclosed anonymously.

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