Patent ID: 6267578
Filing Date: 2001-07-31
Classification: B29C,B29D,B29L,G11B,Y10S

Abstract:
A mold used for molding a pair of base disks, each disk having a center hole, the disks being bonded together by a UV-setting adhesive layer, the mold comprises:a concavity having a flat bottom surface which forms a flat surface projection on the base disk;a stamper on one side of the concavity having an flat surface forming an adhesive bonding surface for the base disk; anda flat surface on the opposite side of the concavity at a level between the bottom surface of the concavity and the flat surface of the stamper,wherein when the flat surface projection of one base disk is engaged with a corresponding flat surface on a corresponding projection of another base disk, an annular stamper clamp groove is formed adjacent to the projections and the center hole formed by the pairing of the disks and a level distance between the bonded surfaces of the base disks is maintained for controlling the thickness of the adhesive layer at a substantially constant value between the two base disks.