| 摘要 |
PURPOSE:To simplify the shape of a centering member and a magnetic member by providing two pieces of centering members having a center hole which becomes a rotation center, in the center part and providing a member to be attracted which interpose the magnetic member between these two pieces of members. CONSTITUTION:A disk 1 is constituted in order that two pieces of substrates 6, 6 having an information recording layer 5 are stuck by placing an inside spacer and an outside spacer between them so that the recording layers 5, 5 become the inside, and also a centering member is attached to both faces of its inside diameter part. The centering members 8, 8 consist of a shape having a center hole 10 fitted to a centering member 9a a revolving shaft 9 of a medium driving means 3, and also having a projecting part for fitting its external form to an inside diameter part 6a of the substrate 6, on the lower face side. Thus, positioning is executed to the substrate 6 by bitting the external part of the projecting part 20a to the inside diameter part 6a of the substrate 6, and in this state, the substrates 6, 6 are stuck by an adhesive agent for exerting no undesirable in influence on the substrates 6, 6. |
