| 摘要 |
<p>PURPOSE:To load a flexible magnetic disk sheet on a writing and reading device without any eccentricity by forming a protection layer of a composite material containing an ultraviolet-ray setting compound incorporating an unsaturable bond over one surface of the circumferential edge of the center circular hole of the flexible magnetic disk sheet, and providing a ring for reinforcement on the other surface. CONSTITUTION:The composite material containing the unsaturable bond capable of being polymerized with ultraviolet rays is printed through a screen on one surface 9 of a flexible magnetic disk sheet 2 to form a protection layer 6 at the circumference of a disk center hole 2a. Further, a reinforcing ring 5 made of plastic paper of polyester, etc., is provided on the surface of the disk opposite to the protection layer 6. Consequently, the disk sheet 2 is put in a jacket 1 at a correct position and loaded without any deformation such as eccentricity, i.e. without causing any position shift in the reading device.</p> |
