| 摘要 |
PROBLEM TO BE SOLVED: To ensure flatness of combined disks in a sticking method for the disks by which the two disks are superposed and are stuck together by using an adhesive or an adhesive tape. SOLUTION: Even in the case where the two disks are superposed with stuck surfaces which are faced each other, the disks are stuck together after the warpage condition of the disks are straightened so as to be in a state where any gap is not generated at the central part of the disks. At this time, the warpage condition of at least one disk is such thatθr is gradually reduced from the central part toward the outer peripheral part of 4 the disks in reference to the radial tilt angleθr( deg.) and the tangential tilt angleθt( deg.) of both sides of stuck surfaces of the disks. Further, the radial tilt angleθr( deg.) is kept to be -1.5<θr<0 at any area except the central part of the disks. Further,θt is kept to be|θt|<0.7 even at areas where the absolute value is the maxinum on the disks.
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