Method and device for recording marks representing data in an information layer of an optical record carrier
AssigneeKoninklijke Philips Electronics N.V.
InventorJoachim Willhelm Hellmig
Life of this patent
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Abstract
A device and method of recording marks representing data in an information layer of a record carrier includes irradiating the information layer by a pulsed radiation beam, each mark being written by a sequence of pulses. The recorded marks are erasable by irradiating the information layer with an erase radiation beam. The erase radiation beam has a first erase power level (e1) for a first erase period (t1), a second erase power level (e2) higher than or equal to the first erase power level (e1) for a second erase period (t2), and a third erase power level (e3) lower than the second erase power level (e2) for a third erase period (t3).
Claims11
A method of recording marks representing data in an information layer of a record carrier comprising the act of:
- irradiating the information layer by a pulsed radiation beam, each mark being written by a sequence of pulses, the recorded marks being erasable by irradiating the information layer with an erase radiation beam,
- wherein said erase radiation beam between two successive sequences of pulses for writing marks comprises three consecutive erase periods, and said erase radiation beam has a first erase power level for a first erase period, a second erase power level higher than or equal to said first erase power level for a second erase period, and a third erase power level lower than said first erase power level for a third erase period.
A method of recording marks representing data in an information layer of a record carrier comprising the act of:
- irradiating the information layer by a pulsed radiation beam, each mark being written by a sequence of pulses, the recorded marks being erasable by irradiating the information layer with an erase radiation beam,
- wherein said erase radiation beam between two successive sequences of pulses for writing marks comprises three consecutive erase periods, and said erase radiation beam has a first erase power level for a first erase period, a second erase power level higher than or equal to said first erase power level for a second erase period, and a third erase power level lower than said second erase power level for a third erase period, and
- wherein said first erase period and said second erase period are shorter than said third erase period.
A method of recording marks representing data in an information layer of a record carrier comprising the act of:
- irradiating the information layer by a pulsed radiation beam, each mark being written by a sequence of pulses, the recorded marks being erasable by irradiating the information layer with an erase radiation beam,
- wherein said erase radiation beam between two successive sequences of pulses for writing marks comprises three consecutive erase periods, and said erase radiation beam has a first erase power level for a first erase period, a second erase power level higher than or equal to said first erase power level for a second erase period, and a third erase power level lower than said second erase power level for a third erase period, and
- wherein the sum of said first erase period and said second erase period is shorter than half the shortest mark being recorded.
A recording device for recording marks representing data in an information layer of a record carrier by irradiating the information layer by a pulsed radiation beam, the device comprising:
- a radiation source providing said radiation beam;
- and
- a control unit for controlling a power of said radiation beam, such that each mark is written by a sequence of pulses and the recorded marks are erasable by irradiating the information layer with an erase radiation beam,
- wherein the control unit is operative for controlling said radiation beam such that said erase radiation beam between two successive sequences of pulses for writing marks comprises three consecutive erase periods, and said erase radiation beam has a first erase power level for a first erase period a second erase power level higher than or equal to said first erase power level for a second erase period, and a third erase power level lower than said first erase power level for a third erase period.
Dependencies are inferred from the claim text.