| 摘要 |
A disc of synthetic resin used for signal recording/reproduction by a head having floating slider, in which the disc substrate is deburred to removed defects in appearance and is improved in strength and quality, and the manufacturing apparatus for the disc substrate. The manufacturing apparatus includes a worktable for supporting the disc substrate in rotation, a positioning unit for positioning the disc substrate at a pre-set position on the worktable and a laser light source for illuminating the laser light on the disc substrate supported for rotation by the worktable. On the outer rim of the disc substrate is formed a raised portion not larger than 15 mum in height. The raised portion has a thickness larger than that of the outermost portion of the disc substrate.
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