Optical disk, optical disk device, and optical disk recording method
AssigneeSony Corporation
InventorsSEIJI KOBAYASHI, KOJI FUJIMIYA
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Abstract
The present invention relates to an optical disk, an optical disk device, and an optical disk recording method. When it is applied to, for example, a compact disk. It attempts to reduce a jitter at the time of reproduction, and reproduce surely the recorded data. A change pattern of a modulation signal (S2) is detected, and the timing of a modulation signal (S1) is corrected according to this change pattern, to irradiate a laser beam L.
Claims11
An optical disk device for switching a signal level of a modulation signal at a period equivalent to an integer multiple of a predetermined fundamental period according to data to be recorded, conducting on-off control on a laser beam by using said modulation signal, and thereby recording said data on a disk-like recording medium, comprising:
- a change pattern detection means for detecting a change pattern of said modulation signal by sampling said modulation signal at said fundamental period;
- and
- a timing correction means for correcting a timing of said modulation signal according to said change pattern, wherein said timing correction means corrects the timing of said modulation signal so that a binary signal will change while taking said fundamental period as unit when a reproduced signal obtained from said disk-like recording medium is converted to said binary signal with a predetermined slice level.
An optical disk recording method for switching a signal level of a modulation signal at a period equivalent to an integer multiple of a predetermined fundamental period according to data to be recorded, conducting on-off control on a laser beam by using said modulation signal, and thereby recording said data on a disk-like recording medium, comprising the step of:
- correcting a timing of said modulation signal according to a change pattern of said modulation signal.
An optical disk having desired data recorded thereon by a pit formed on an information recording surface, wherein said pit is formed so that a position of each edge will be changed from a fundamental position according to a pit length and a land length located before and behind said edge.
An optical disk device for generating a modulation signal according to data to be recorded, driving a laser light source by using said modulation signal to intermittently raise a light quantity of a laser beam to a light quantity for writing, and recording said data on a disk-like recording medium, comprising:
- a light quantity switching means for switching over said light quantity for writing;
- and
- a timing control means for varying a timing of said modulation signal in an interlinked relation to said light quantity switching means and thereby correcting a timing of raising the light quantity of said laser beam to said light quantity for writing.
An optical disk recording method for intermittently raising a light quantity of a laser beam to a light quantity for writing according to data to be recorded, and recording said data on a disk-like recording medium, comprising the step of:
- increasing, in a predetermined area of said disk-like recording medium, said light quantity for writing;
- and
- correcting a timing of raising the light quantity of said laser beam to said light quantity for writing in response to said increase of said light quantity for writing.
An optical disk having desired data recorded thereon by a pit formed on an information recording surface, comprising:
- an area having a high reflectance value and an area having a low reflectance value formed on said information recording surface;
- and
- a desired image recorded on said information recording surface thereby, wherein said high reflectance area and said low reflectance area are formed dependent on a difference in pit width of said pit;
- and
- said pit is formed so that pit to which the same data is allocated has a different pit length in order to correct a change of a returned light caused by said difference in pit width at time of reproduction.
Dependencies are inferred from the claim text.