Recording waveform for mark-length modulation optical recording

Claim 1

A method of recording information on a recording medium, which is capable of achieving a first phase by application of an energy beam of a first energy level and a second phase by application of the energy beam of a second energy level, by projecting on the recording medium pulses of the energy beam so as to record the information on the recording medium in a form of one or more dots where the recording medium takes the first phase, said method comprising the steps of: moving the recording medium relative to the energy beam; and projecting on the recording medium the energy beam of the second energy level when no dot is to be recorded. projecting a single pulse of the energy beam having the first energy level and a predetermined pulse length when a short dot, having a length less than a predetermined length, is to be recorded; and projecting a plurality of consecutive pulses of the energy beam each having the first energy level and said predetermined pulse length when a dot having a length not less than said predetermined length is to be recorded, said predetermined pulse length corresponding to a duration time which is shorter than a time interval required for the energy beam, in its relative movement, to move from one end to an opposite end of the short dot to be recorded.

Claim 2

A method of recording information on a recording medium, which is capable of achieving a first phase by application of an energy beam of a first energy level and a second phase by application of the energy beam of a second energy level, by projecting on the recording medium pulses of the energy beam so as to record the information on the recording medium in a form of one or more dots where the recording medium takes the first phase, said method comprising the steps of: moving the recording medium relative to the energy beam; and projecting on the recording medium the energy beam of the second energy level when no dot is to be recorded. projecting a single pulse of the energy beam having the first energy level and a predetermined pulse length when a short dot, having a length less than a predetermined length, is to be recorded; and projecting a plurality of consecutive pulses of the energy beam each having the first energy level and said predetermined pulse length when a dot having a length not less than said predetermined length is to be recorded, said predetermined pulse length corresponding to a duration time which is shorter than a time interval required for the energy beam, in its relative movement, to move from one end to an opposite end of the short dot to be recorded.

Claim 6

A method of recording information using a recording medium which is variable between two different phases and capable of entering a first phase by application of an energy beam of a first power level and a second phase by application of an energy beam of a second power level, wherein the information is recorded on the recording medium in a form of one or more dots where the recording medium is in said first phase, said method comprising the steps of: projecting an energy beam on the recording medium with the second power level; moving the recording medium relative to the energy beam; and modifying the energy beam in a form of a pulse having the first power level and continuing for a first time period when the information is to be recorded in a form of a short dot on the recording medium, said short dot having a length less than a first predetermined dot length, wherein said first time period is less than a time for moving the energy beam across the recording medium by a distance equal to said first predetermined dot length; wherein when the information is to be recorded in a form of a dot longer than said first predetermined dot length, the energy beam alternates between the first power level and a third power level, not higher than any of the first and second power levels a plurality of times for a second time period corresponding to a length of the longer dot.

Claim 7

A method of recording information using a recording medium which is variable between two different phases and capable of entering a first phase by application of an energy beam of a first power level and a second phase by application of an energy beam of a second power level, wherein the information is recorded on the recording medium in a form of one or more dots where the recording medium is in said first phase, said method comprising the steps of: projecting an energy beam on the recording medium with the second power level; moving the recording medium relative to the energy beam; and modifying the energy beam in a form of a pulse having the first power level and continuing for a first time period when the information is to be recorded in a form of a short dot on the recording medium, said short dot having a length less than a first predetermined dot length, wherein said first time period is less than a time for moving the energy beam across the recording medium by a distance equal to said first predetermined dot length; wherein when the information is to be recorded in a form of a dot longer than said first predetermined dot length, the energy beam alternates between the first power level and a third power level, not higher than any of the first and second power levels a plurality of times for a second time period corresponding to a length of the longer dot.