Rewritable optical recording medium and manufacturing method and apparatus therefor
AssigneePioneer Corporation
InventorsYoshio Sasaki, Toshihiko Naruyama, Eiji Muramatsu, Masahiro Kato, Seiro Oshima, Takao Tagiri
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Abstract
A rewritable optical recording medium includes a segmented groove area in which the groove track is segmented along a rotating direction of the recording medium by groove non-forming portions to form a plurality of groove portions; and a continuous groove area in which a continuous groove is formed, the continuous groove having a groove width smaller than a groove width in the segmented groove area.
Claims11
A rewritable optical recording medium on which a land track and a groove track for recording a data signal are formed, comprising:
- a segmented groove area in which the groove track is segmented along a rotating direction of said optical recording medium by groove non-forming portions to form a plurality of groove portions;
- and
- a continuous groove area in which a continuous groove is formed, said continuous groove having a groove width smaller than a groove width in said segmented groove area.
A method of manufacturing a master disc for a rewritable optical recording medium having a land track and a groove track for recording a data signal by irradiating a laser beam on the master disc, comprising the steps of:
- forming a segmented groove track having a plurality of groove portions in a first area of said optical recording medium along a rotating direction of said optical recording medium;
- and
- forming, in a second area of said optical recording medium, a continuous groove track having a groove width smaller than a groove width of said first area.
An apparatus of manufacturing a master disc for a rewritable optical recording medium having a land track and a groove track for recording a data signal by irradiating a laser beam on the master disc, comprising:
- means for forming a segmented groove track having a plurality of groove portions in a first area of said optical recording medium along a rotating direction of said optical recording medium;
- and
- means for forming, in a second area of said optical recording medium, a continuous groove track having a groove width smaller than a groove width in said first area.
Dependencies are inferred from the claim text.