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AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsKen'ichi Nagata, Kenichi Nishiuchi, Eiji Ohno, Nobuo Akahira, Kenji Narumi
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A recording and reproducing method and apparatus for an optical disk of the phase transition type is provided. This method comprises the steps of deciding at random to invert or not to invert write data that has a predetermined block length; inverting the write data if the decision is to invert the write data; and recording either the non-inverted write data or the inverted write data into the photo-sensitive record layer. A synchronizing signal is recorded before the write data and/or dummy data after the write data in the way such that thermal stress is less likely to occur. A record end position can be determined precisely by detecting a stop pulse.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer corresponding to binary data, comprising the steps of
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising providing write data to be recorded into each sector of the optical information recording medium that includes original write data and dummy data added to the head of the original write data, and selecting a ratio of a recorded mark distance and a recorded mark length for the dummy data that is larger nearer to the head of the dummy data.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising providing write data to be recorded into each sector of the optical information recording medium that includes original write data and dummy data following the original write data, and selecting a ratio of a recorded mark distance and a recorded mark length for the dummy data that is larger nearer to the end of the dummy data.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, wherein write data to be recorded includes original write data and dummy data following the original write data and the light intensity is decreased slowly in the area of the dummy data after the write data to be recorded into each sector of the optical information recording medium.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, wherein write data to be recorded into each sector of the optical information recording medium include a synchronizing signal, a data head indicating mark added to the end of the synchronizing signal, original write data following the data head indicating mark, and dummy data added to the end of the original write data, and wherein a length of the dummy data is altered according to a position of the data head indicating mark.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, wherein write data to be recorded into each sector of the optical information recording medium include a synchronizing signal, a data head indicating mark added to the end of the synchronizing signal, and original write data following the data head indicating mark, and wherein a position of the data head indicating mark is altered in a predetermined range at every recording, and wherein a largest position shift of the data head indicating mark is altered according to a record radius.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, wherein write data to be recorded into each sector of the optical information recording medium include a synchronizing signal, a data head indicating mark added to the end of the synchronizing signal, and original write data following the data head indicating mark, and wherein a position of the data head indicating mark is altered in a predetermined range at every recording, and wherein an average length of the synchronizing signal area is altered according to a record radius.
A recording and reproducing method for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, wherein write data to be recorded into each sector of the optical information recording medium includes a synchronizing signal, a data head indicating mark added to the end of the synchronizing signal, original write data following the data head indicating mark, and dummy data added to the end of the original data, and wherein a length of the dummy data in each sector is altered in predetermined range at every recording, and wherein an average length of the dummy data is altered according to a record radius.
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer corresponding to a binary data, comprising
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photosensitive record layer, comprising:
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
The recording and reproducing apparatus for an optical information recording medium according to claim 21, wherein the apparatus includes means for adjusting a record end position of the dummy data in a sector of the optical information recording medium so as to be substantially fixed.
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
A recording and reproducing apparatus for an optical information recording medium in which a light beam is irradiated to change a state of a photo-sensitive record layer, comprising
Dependencies are inferred from the claim text.