Methods and devices for recording marks on a recording surface of an optical record carrier
AssigneeKoninklijke Philips Electronics N.V.
InventorsBenno Tieke, Robert Woudenberg
Life of this patent
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Abstract
The invention relates to methods and devices for forming marks and lands by applying a radiation beam (32) to a recording surface (301) of an optical record carrier (30). Recording strategies are proposed for recording information at high recording speeds. An intermediate power level (P1, P2) is introduced in between the bottom power level (P0) and the write power level (Pw), its value being dependent on the length of the preceding land (151, 152, 153). A raised write power level (PR1, PR2) is also proposed, its value being dependent on the length of the mark to be recorded (241, 242, 243).
Claims12
An optical record carrier recording method for forming marks and lands by applying a radiation beam to a recording surface of an optical record carrier, the radiation beam for each mark to be recorded being set to at least one write power level capable of forming a mark during a write power irradiation period and being set for each land section between the marks, to at least one bottom power level incapable of forming a mark during a bottom power irradiation period, characterized in that
- the radiation beam is set to at least one intermediate power level after the bottom power irradiation period and before the write power irradiation period, the intermediate power level being higher than the bottom power level and being set in accordance with a time length of the preceding bottom power irradiation period.
An optical record carrier recording method for forming marks and lands by applying a radiation beam to a recording surface of an optical record carrier, the marks having a time length of nT, where T represents the time length of one period of a reference clock in a data signal and n represents a predetermined natural number,
- wherein the radiation beam for each mark to be recorded, having a time length of wT, where w represents a predetermined natural number larger than 2, is set to a write power level capable of forming a mark, and
- wherein the radiation beam for each mark to be recorded, having a time length of uT, where u represents a predetermined natural number lower than w, is set to a first raised write power level capable of forming a mark, the first raised write power level being higher than the write power level and being set in accordance with a time length of the mark to be recorded, and
- wherein the radiation beam for each mark to be recorded, having a time length of vT, where v represents a predetermined natural number lower than w and higher than u, is set to the write power level during a first portion of a write power irradiation period and set to a second raised write power level during a second portion of a write power irradiation period, the first portion preceding the second portion and the second raised write power level being higher than the write power level and being set in accordance with a time length of the mark to be recorded, and
- wherein for each land section between the marks the radiation beam is set to at least one bottom power level incapable of forming a mark during a bottom power irradiation period.
An optical recording device for recording data in the form of marks and lands on a recording surface of an optical record carrier by irradiating the recording surface by means of a radiation beam, the device comprising a radiation source for providing the radiation beam and control means for controlling the power of the radiation beam such that it has at least one write power level capable of forming a mark during a write power irradiation period and that it has at least one bottom power level incapable of forming a mark during a bottom power irradiation period, characterized in that
- the control means are operative to control the power of the radiation beam such that is has at least one intermediate power level after the bottom power irradiation period and before the write power irradiation period, and that
- the control means are operative to set the intermediate power level in accordance with a time length of the preceding bottom power irradiation period.
An optical recording device for recording data in the form of marks and lands on a recording surface of an optical record carrier by irradiating the recording surface by means of a radiation beam, the marks having a time length of nT, where T represents the time length of one period of a reference clock in a data signal and n represents a predetermined natural number, the device comprising a radiation source for providing the radiation beam and control means for controlling the power of the radiation beam such that it has
- a write power level capable of forming a mark when recording a mark having a time length of wT, where w represents a predetermined natural number larger than 2, and such that it has
- a first raised write power level capable of forming a mark when recording a mark having a time length of uT, where u represents a predetermined natural number lower than w, the first raised write power level being higher than the write power level a being set in accordance with a time length of the mark to be recorded, and such that it has
- a write power level during a first portion of a write power irradiation period and has a second raised write power level during a second portion of the write power irradiation period when recording a mark having a time length of vT, where v represents a predetermined natural number lower than w and higher than u, the first portion preceding the second portion and the second raised write power level being higher than the write power level and being set in accordance with a time length of the mark to be recorded, and such that it has
- bottom power level incapable of forming a mark during a bottom power irradiation period between the marks.
Dependencies are inferred from the claim text.