Patent ID: 6391139
Filing Date: 2002-05-21
Classification: G11B,Y10T

Abstract:
A method of manufacturing a disk cartridge, comprising the steps of:preparing a disk-shaped magnetic disk medium having a first diameter defined by a first center; preparing a disk-shaped reinforcing member having a second diameter smaller than the first diameter and defined by a second center; adhering said reinforcing member to the lower surface of said magnetic disk medium with said first and said second centers coincident with each other; removing a center portion of said magnetic disk medium with said reinforcing member adhered thereto to form a circular opening having a third diameter smaller than the second diameter; preparing a metal hub comprising a cylindrical portion having a fourth diameter smaller than the third diameter and a flange portion formed at the upper end of said cylindrical portion and having a fifth diameter greater than the third diameter; and fitting said cylindrical portion into said circular opening of said magnetic disk medium on the side of the upper surface thereof and adhering-the lower surface of said flange portion and the upper surface of said magnetic disk medium at the periphery of said circular opening.