| 摘要 |
PURPOSE:To adjust the gas pressure of a gas charging space in a substrate and seal the space by moving mutually a disk in an inner circumferential direction and charging an adhesive to a notch part when two disks are pressure- bonded by a ring-shaped adhesive layer with a notched part. CONSTITUTION:To the outer circumferential and inner circumferential parts of a recording layer facing groove 1 of a disk A, adhesives layers 2 an 3 are drawing-coated, and at one layer of above of the layers 2 and 3, for example, the layer 3, a notch part 3a to penetrate the layer in a radius direction is provided. Next, a disk B having a recording layer 1a is overlapped and pressurized onto the disk A, the width of the layers 2 and 3 is expanded and the gas compressed in a gas charging space S is escaped from a notch 3a to the external part. Next, after pressurization is stopped, the adhesives are charged to the notch 3a with the method such as rotating a turntable 6 and adhesives 3 are formed to the whole circumference. Thus, since the gas of approximately one atmospheric pressure is charged and sealed to a space S, the air sandwiching structure of the disk is held without fail.
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