| 摘要 |
PURPOSE:To prevent physical and optical deformation by constituting the title medium of an air vent with a level difference part formed in the internal peripheral part of a substrate, adhesives unevenly applied between the level difference part and the internal peripheral part of a spacer, and a notch part formed in the external peripheral part of the spacer. CONSTITUTION:Information forming layers 12 are provided on the facing surfaces of a pair of substrates 11 and 11, an internal space 15 is constituted by laying an internal peripheral spacer 13 and an external peripheral spacer 14 between the substrates 11 and 11, a central hole 16 is possessed at a central part, and the substrates 11 and 11 and the spacer 13 are adhered by adhesives 18. Further, the air vent 20 is constituted by the level difference part 17 of the substrates 11 and 11, a porous and rugged adhering part 18a laid between the level difference part 17 and the internal peripheral part of the spacer 13, and the notch part of the spacer 13. Thus, the physical and optical deformation can be prevented and yield can be increased. |
