Recording method and apparatus for optical recording medium with a laminated structure having ROM and RAM layers
AssigneeFujitsu Limited
InventorsTetsuo Hosokawa, Nobuhide Aoyama
Life of this patent
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Abstract
The recording method for an optical recording medium with a laminated structure with a ROM layer, from which data having been recorded beforehand can be read out, and a RAM layer, from which data is read out and in which data is recordable, includes: emitting laser light that has two or more pulses per record unit of a RAM record mark, which is recorded as data on the RAM layer, thereby recording the RAM record mark.
Claims18
A recording method for an optical recording medium with a laminated structure with a laminating ROM layer, from which data having been recorded beforehand can be read out, and a laminating RAM layer, from which data can be read out and in which data is recordable, said method comprising:
- recording a RAM record mark in the RAM layer in such a manner that a relationship of TA/(n+2)≦TOM (n≧0) is held between a record unit TA of the RAM record mark which is recorded as data in the RAM layer by laser light and a minimum mark length TOM of a ROM record mark which is recorded as data in the ROM layer.
A recording method for an optical recording medium, with a laminated structure with a laminating ROM layer, from which data having been recorded beforehand can be read out, and a laminating RAM layer, from which data is read out and in which data is recordable, said method comprising:
- emitting laser light that has two or more pulses per record unit of a RAM record mark, which is recorded as data on the RAM layer, thereby recording the RAM record mark,
- wherein recording of the RAM record mark and reading of data recorded in the ROM layer are concurrently performed,
- wherein a trial of recording/reading in/from the RAM layer and a trial of reading from the ROM layer are performed with the pulse duty ratio of the laser light being changed, and
- wherein the pulse duty ratio of the laser light is adjusted so that the error rate at the time of reading from the ROM layer, which rate is obtained by the trial, and the error rate at the time reading from the RAM layer, which rate is obtained by the trial, take minimum values.
A recording apparatus for an optical recording medium with a laminated structure with a laminating ROM layer, from which data having been recorded beforehand can be read out, and a laminating RAM layer, from which data is read out and in which data is recordable, said apparatus comprising:
- a control unit which performs control such that laser light having two or more pulses per record unit of a RAM record mark, which is recorded as data on the RAM layer, are emitted, and that the RAM record mark is recorded by the emitted laser light,
- wherein recording of the RAM record mark and reading of data recorded in the ROM layer are concurrently performed,
- wherein a trial of recording/reading in/from the RAM layer and a trial of reading from the ROM layer are performed with the pulse duty ratio of the laser light being changed, and
- wherein the pulse duty ratio of the laser light is adjusted so that the error rate at the time of reading from the ROM layer, which rate is obtained by the trial, and the error rate at the time reading from the RAM layer, which rate is obtained by the trial, take minimum values.
A recording apparatus for an optical recording medium with a laminated structure with a laminating ROM layer, from which data having been recorded beforehand can be read out, and a laminating RAM layer, from which data can be read out and in which data is recordable, said apparatus comprising:
- a control unit which performs control such that a RAM record mark is recorded in the RAM layer in such a manner that a relationship of TA/(n+2)≦TOM (n≧0) is held between a record unit TA of the RAM record mark which is recorded as data in the RAM layer by laser light and a minimum mark length TOM of a ROM record mark which is recorded as data in the ROM layer.
Dependencies are inferred from the claim text.