METHOD OF FABRICATING GLASS MAGNETIC HARD DRIVE DISK PLATTER USING FILAMENTATION BY BURST ULTRAFAST LASER PULSES

摘要

PROBLEM TO BE SOLVED: To provide a non-ablative method and apparatus for making an economical glass hard disk (platter) for a hard disk drive (HDD) using a filamentation material machining by means of burst laser pulses.SOLUTION: Two related methods disclosed, differing only in whether a glass substrate an HDD platter is to be cut from has been coated with all the necessary material layers to function as magnetic media in a computer's hard drive. Platter blanks 10 are precisely cut using filamentation by burst ultrafast laser pulses 2 such that the blank's edges need not be ground, the platter's geometric circularity need not be corrected and there is no need for further surface polishing. Thus the platters can be cut from raw glass or coated glass. As a result, this method reduces the product contamination, speeds up production, and realizes great reductions in the quantity of waste materials and lower production costs.