| 摘要 |
PURPOSE:To obtain permeability by providing brushing patterns with a specific dimension width at least at one part on the one or both substrate adhesive surfaces of an internal peripheral spacer. CONSTITUTION:Substrates 11 and 12 are equipped with respective recording layers 13 and 14, the substrates 11 and 12 sandwich internal peripheral spacers 15 and 1 and an external peripheral spacer 16, they are connected by adhesives, and a spacer 17 is formed. The internal peripheral spacer 1 is obtained by injection-forming an ABS resin, and at least at one part of the one or both substrate adhesive surfaces 2, a brushing pattern 3 in a radius direction to continuously connect the internal and external peripheries of the internal peripheral spacer 1 is provided over the width of 1mm-15mm. The plural grooves or the pattern function to apply the permeability while preventing the entrance of dirt and harmful gas. Thus, the optical disk can obtain the permeatility and change due to pressure change can be eased in a short time. |
