| 摘要 |
PURPOSE:To obtain a magnetic disk, etc. which is suited especially to the high- density recording with excellent strength, by bonding two substrates obtained by vapor depositing a ferromagnetic and metallic thin film on a single side of a comparatively thin polymer substrate to a comparatively thick polymer forming product substrate of the same material as said two substrates at the side opposite to a magnetic film. CONSTITUTION:A ferromagnetic and metallic thin film 4 is formed by a vacuum vapor deposition on a single side of a comparatively thin polymer substrate 3. Two sheets of such substrate 3 are bonded on both sides of a forming product substrate 5 having a comparatively large thickness and the same material as the substrate 3 by means of an adhesive 6 and with the film 4 set outside. This bonded substrate is consecutively blanked into a desired shape including a circle, an oblong, etc. in order to obtain a floppy disk, a magnetic card, etc. The substrate 3 is adhered close to a cooling drum owing to a small thickness of the substrate 3 when the film 4 is vapor deposited, and therefore the vapor deposition is carried out evenly with good smoothness. Furthermore the mechanical strength is increased with junction of a substrate 5. Thus it is possible to obtain simply and with a low cost a high-density recording/reproducing plate. |
