| 摘要 |
PURPOSE:To improve recording/reproducing characteristic and high speed drivability by providing a space regulating means for a space between two sheets of plate-shaped members of laminated construction between both the plate-shaped members. CONSTITUTION:Spacers 3, 4 are interposed at the inner circumferential part and the outer circumferential part of two sheets of the disk-shaped recording single plates 1, 2, and the spaces between the recording single plates 1,2 and the spacers 3, 4 and between the recording layers 5 of the recording single plates 1, 2 are stuck together through a bonding layer 6. Thus, when the space regulating means 3, 4 are interposed, the bonding layer 6 of definite thickness can be always interposed between two sheets of the plate-shaped members 1, 2 regardless of the viscosity of adhesive, and the variation of total thickness can be lessened. Thus, parallelism between two sheets of the plate-shaped members can be raised, and the recording/reproducing characteristic can be improved, and rotary driving speed can be speeded up. |
