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US 2004/0105365 A1Published application
Optical disc and optical disc address reading apparatus and method
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsShigeru Furumiya, Hiromichi Ishibashi, Takashi Ishida, Yoshiharu Kobayashi
Life of this patent
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Abstract
An optical disc having marks for dispersed addresses that can be easily detected with high precision. A dispersed address comprises synchronization marks, positive marks, and negative marks. Synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.
Claims38
A rewritable optical disc with a spiral or concentric track comprising:
- a groove formed with a sinusoidal wobble along the track;
- a sector block disposed along the track;
- sectors formed by dividing each sector block into a plurality of parts;
- a synchronization mark formed in the first sector in each sector block;
- and
- positive marks or negative marks formed in sectors other than the first sector in each sector block;
- each positive mark being a first groove discontinuity creating a discontinuity of a first width W1 in the track direction of the groove,
- each negative mark being a second groove discontinuity creating a discontinuity of a second width W0 in the track direction of the groove, and
- each synchronization mark being a third groove discontinuity creating a discontinuity of a third width Ws in the track direction.
6 more elements
A rewritable optical disc with a spiral or concentric track comprising:
- a groove formed with a sinusoidal wobble along the track;
- a sector block disposed along the track;
- sectors formed by dividing each sector block into a plurality of parts;
- a synchronization mark formed in the first sector in each sector block;
- and
- positive marks or negative marks formed in sectors other than the first sector in each sector block;
- each positive mark, negative mark, and synchronization mark being formed as a groove top offset portion where the groove is locally offset in a first direction perpendicular to the track direction, a groove bottom offset portion where the groove is locally offset in a second direction perpendicular to the track direction, or a combination of groove bottom offset portions and groove top offset portions.
4 more elements
A rewritable optical disc with a spiral or concentric track comprising:
- a groove formed with a sinusoidal wobble along the track;
- a sector block disposed along the track;
- sectors formed by dividing each sector block into a plurality of parts;
- a synchronization mark formed in the first sector in each sector block;
- and
- positive marks or negative marks formed in sectors other than the first sector in each sector block;
- each positive mark, negative mark, and synchronization mark being formed by a groove ascending-phase inversion portion for vertically phase inverting an approximately {fraction (1/4)} wobble cycle part from a trough in the wobble groove, a groove descending-phase inversion part for vertically phase inverting an approximately {fraction (1/4)} wobble cycle part from a peak in the wobble groove, or a combination of a groove ascending-phase inversion part and groove descending-phase inversion part.
4 more elements
A rewritable optical disc with a spiral or concentric track comprising:
- a groove formed with a sinusoidal wobble along the track;
- a sector block disposed along the track;
- sectors formed by dividing each sector block into a plurality of parts;
- a synchronization mark formed in the first sector in each sector block;
- and
- positive marks or negative marks formed in sectors other than the first sector in each sector block;
- each positive mark, negative mark, and synchronization mark being formed by a groove ascending-rectilinear portion connected to the wobble peak by forming the groove at a trough level from a trough in the wobble groove to an approximately {fraction (1/4)} wobble cycle portion of the wobble groove, then abruptly changing to a peak level and forming the groove at the peak level in the next 1/4 wobble cycle portion,
- a groove descending-rectilinear portion connected to the wobble trough by forming the groove at a peak level from a peak in the wobble groove to an approximately {fraction (1/4)} wobble cycle portion of the wobble groove, then abruptly changing to a trough level and forming the groove at the trough level in the next 1/4 wobble cycle portion, or
- a combination of a groove descending-rectilinear portion and groove ascending-rectilinear portion.
6 more elements
An optical disc as described in daim 21, wherein each positive mark is formed by said groove ascending-rectilinear portion being repeated for a plurality of cycles of the wobbled groove,
- each negative mark is formed by said groove descending-rectilinear portion being repeated for a plurality of cycles of the wobbled groove, and
- each synchronization mark is formed by said combination of a groove descending-rectilinear portion and groove ascending-rectilinear portion being repeated for a plurality of cycles of the wobbled groove.
Dependencies are inferred from the claim text.