| 摘要 |
A magnetic disk cartridge which prevents center cores from biting into each other when the cores are stacked during manufacture, and which can be produced at low cost with improved productivity. The center core includes an engagement hole formed in the central portion thereof, which includes a rising edge portion in the edge portion thereof. The height of the rising edge portion is determined in such a manner that, in order to prevent the flange inner peripheral corner portion and bottom outer peripheral corner portion of the center cores from contacting each other along the peripheries thereof when the cores are stacked, the rising edge portion of the engagement hole of one center core is allowed to contact the bottom surface portion 4b of the adjacent core. Also, the radius of curvature of the bottom outer peripheral corner portion is made greater than the radius of curvature of the flange inner peripheral corner portion. <IMAGE> |
