| 摘要 |
PURPOSE:To achieve a large recording capacity even if the size of an optical disk where light information of a computer, etc., is recorded is reduced and contrive a thinner optical disk device. CONSTITUTION:A memory disk part 12 which records various kind of information is provided concentrically with a center hole 11a at the surface inner- diameter side of a substrate 11 which is formed in a circular plate with the center hole 11a for rotary-positioning. Also, a hub 13 where a rubber part 13-2 which transfers rotation to the substrate 11 and a ring-shaped metal part 13-1 are laid out is provided outside the memory disk part 12. |
