Optical disk having synchronous marks and data marks to satisfy certain criteria
AssigneePioneer Electronic Corporation
InventorsFumihiko Yokogawa, Hideki Hayashi
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Abstract
An optical disk having a recording format for a sampled servo system and including a servo field which is preformatted, including synchronous marks for synchronizing detection, and a data field for recording data on each track. The length of the synchronous mark is defined to render the detection of the synchronous pattern possible by making it easily distinguishable from the maximum inversion interval in the data even if the optical disk is of the constant-linear-velocity (CLV) type.
Claims5
An optical disk comprising a synchronous mark for synchronizing detection, and a data field for recording data on each track;
- wherein, if:
- a length of one pit interval of said data is given by T;
- a length of said synchronous mark in a direction of the track is given by nT, wherein n is an integer;
- a maximum detection error generated when reading said synchronous mark is given by .alpha.T;
- and
- a maximum inversion interval between recorded marks with respect to said data is given by mT,
- the integer n is set to satisfy the following two expressions:
- (n-.alpha.)T>mT
- mT.times.(n+.alpha.)/n<nT,
- where .alpha..gtoreq.2.
Dependencies are inferred from the claim text.