| 摘要 |
PURPOSE:To rotate a circle formed with a tracking guide without an eccentricity and to improve a contactness with a hub by fitting the peripheral wall of the hub in the periphery of an opening from a substrate side, and simultaneously, bonding the contact part of the substrate and hub. CONSTITUTION:To a central hole 2 in the central part of a substrate 1 of an optical recording medium A, an opening 10 is provided, and in the periphery of the opening 10, a peripheral wall 8 of a hub 4b made of a polycarbonate, in which the peripheral wall 8 is provided, is fitted. Two contract parts of a substrate surface 6 in the central part of the substrate 1 and the flat part of a disk 12 of the hub 4b to be the contact part of the substrate 1 and hub 4b and of the central hole 2 of the substrate and the peripheral wall 8 provided in the periphery of the opening 10 of the hub are bond-fixed in two directions with an adhesive 5 in being made orthogonal to each other. Thus, the central position of the rotation of the optical recording medium cannot be dislocated, the circle formed by a tracking guide 3 can be rotated without the eccentricity, and the substrate and hub can be prevented from being separated. |
