Optical recording method
AssigneeMitsubishi Kagaku Media Co., Ltd.
InventorsMasaaki Mizuno, Hiroyuki Hoshino, Takashi Ohno, Michikazu Horie
Life of this patent
Estimating the term…
Abstract
In an optical recording method used when information is recorded in a phase-change recording layer of a large-capacity rewritable optical recording medium such as a DVD-RW, one block pulse is used as a recording pulse for forming one recording mark when a recording velocity is higher than a recording linear velocity at which the rewritable optical recording medium can be rewritten, whereas a pulse train comprised of a plurality of short pulses is used as the recording pulse for forming one recording pulse when the recording velocity is within recording linear velocities at which the rewritable optical recording medium can be rewritten, whereby high-velocity recording is realized.
Claims6
An optical recording method wherein information is recorded by forming recording marks in an amorphous state with various lengths on a crystalline state which is used as an unrecorded/erased state, in a phase-change recording layer of a rewritable optical recording medium having said phase-change recording layer, characterized in that:
- using one block pulse as a recording pulse to form one recording mark when a recording velocity is higher than a rewritable recording velocity;
- advancing the end timing of said block pulse by a first predetermined time period from the end timing of a data signal pulse when a length of said recording mark is not less than a predetermined length;
- delaying the start timing of said block pulse by a second predetermined time period from the start timing of the data signal pulse and advancing the end timing of said block pulse by a first predetermined time period from the end timing of said data signal pulse when the length of said recording mark is shorter than the predetermined length;
- and
- when the recording velocity is not higher than the rewritable recording velocity, using a pulse train comprised of a plurality of recording pulses as the recording pulse to form one recording mark.
An optical recording method used when information is recorded by forming recording marks in an amorphous state with various lengths, on a crystalline state which is used as an unrecorded/erased state in a phase-change recording layer of a rewritable optical recording medium having said phase-change recording layer, characterized in that:
- using one block pulse as a recording pulse to form one recording mark when a recording velocity is higher than a rewritable recording velocity;
- and
- when a length of said recording mark is shorter than a predetermined length, delaying the start timing of said block pulse by a predetermined time period which is longer than in case of recording marks longer than said predetermined length.
A recording/retrieving apparatus wherein information is recorded by forming recording marks in an amorphous state with various lengths, on a crystalline state which is used as an unrecorded/erased state, in a phase-change recording layer of a rewritable optical recording medium having said phase-change recording layer, characterized in that:
- using one block pulse as a recording pulse to form one recording mark when a recording relocity is higher than a rewritable recording relocity, advancing the end timing of said block pulse by a first predetermined time period from the end timing of a data signal pulse when a length of said recording mark is not less than a predetermined length, and delaying the start timing of said block pulse by a second predetermined time period from the start timing of the data signal pulse and advancing the end timing of said block pulse by a first predetermined time period from the end timing of said data signal pulse when the length of said recording mark is shorter than the predetermined length;
- and
- when the recording velocity is not higher than the rewritable recording velocity, using a pulse train comprised of a plurality of recording pulses as a recording pulse to form one recording mark.
Dependencies are inferred from the claim text.