Recording waveform for mark-length modulation optical recording
Method and apparatus for recording information using an energy beam of power levels changed stepwise
Magneto-optical recording medium
Apparatus for recording and reproducing data on a disk
Prepulse conditon/heat shut off condition determination method and apparatus for optical recording, and optical recording method and apparatus
Phase changing recording medium with amorphous points each formed by a pair of high power and low recording pulses Patent #: 5608710
ApplicationNo. 725944 filed on 10/08/1996
US Classes:369/59.11, Binary signal processing for controlling recording light characteristic369/107, Ground noise suppression, signal envelope, or plural optical modulation369/116Light intensity adjustment or maintenance
ExaminersPrimary: Nelms, David C.
Assistant: Chu, Kim-Kwok
Attorney, Agent or Firm
Foreign Patent References
International ClassG11B 007/00
Foreign Application Priority Data1995-10-09 JP
AbstractIn mark length modulation recording, a mark end portion correction pulse train is added to a recording pulse train, or laser radiation with bias power is applied between the recording pulse train and laser radiation with cooling power or the mark end portion correction pulse train, furthermore, the start time of the cooling power radiation, the duration of the cooling power radiation, and the shape of the mark end portion correction pulse train are varied in accordance with the mark length to be recorded, further, in CAV mode, the start time of the cooling power radiation or the duration of the cooling power radiation is varied in accordance with disk radius position, and when the recording pulse train consists of a start pulse, an end pulse, and pulses between the start and end pulses, laser radiation with cooling power is applied, or laser radiation with bias power is applied between the recording pulse train and cooling power application, and when the recording pulse train is varied in accordance with mark length and mark spacing, the timing to start the laser radiation with cooling power is delayed by a predetermined amount from the end pulse or determined based on the clock.