| 摘要 |
PURPOSE:To absorb falling impact, elongation, etc., into cushion materials such as thermoplastic elastomer or rubber sheet so that no strains are generated in substrates by adhering said cushion materials between the spacers for forming an air layer and substrates of a laminated information recording disk of an air sandwich type. CONSTITUTION:The thermoplastic elastomer of; for example, styrene type having 50-200mum are adhered as the cushion materials 7 between the outside spacer 3, inside spacer 4 and the substrates 2, 6. The strains generated in the substrates 2, 6 are, therefore, relieved by the elongation and contraction property of the cushion materials 7 even if the substrates 2, 6 are elongated and a difference in the elongation is generated between the substrates and the outside spacer 3 by a change in the environment where the lamination type information recording disk is placed; i.e., temp. and humidity. Generation of warpage in the substrates 2, 6 and generation of exfoliation in the adhesion of the substrates to the outside spacer 3 are obviated. Even if the disk is dropped, the falling impact thereof is relieved and absorbed by the elasticity of the cushion materials; therefore, the impact to the generation of the exfoliation is prevented. |
