Optical disk and address reproduction method of optical disk

Abstract

Abstract PURPOSE:To enable more accurate reading of signals on a V groove optical disk by securing length at least twice that of address cutting as an address area in the optical disk radial section of which is a V-shaped groove, and cutting so as to avoid overlapping of addresses. CONSTITUTION:When making record reproduction of signals by uniform angular velocity driving, sets of A and B, C and D, E and D placed in the direction of the disk in address area represent two slopes of a V-groove respectively. Supposing that the number of address bits including an address mark that indicates the address length of signals and the beginning of an address, and an error check code for monitoring address error is L, this address area 8 secures the physical length that can cut information of at least 2L bits. The address area 8 is bisected at 3, 4, 6, 7, and address cutting is made alternately by V-grooves adjoining in the radial direction into areas such as 3, 7. As overlapping of addresses can be prevented by this way, reading of address of reproduction beam becomes possible.

Inventors

• 👤 Kazuaki Obara
• 👤 和昭 小原
• 👤 Yoshiya Takemura
• 👤 佳也 竹村
• 👤 Michiyoshi Nagashima
• 👤 道芳 永島

Bibliographic Details