Method and apparatus for recording data on an optical recording medium
View Patent ↗An optical recording apparatus and method thereof form a mark and a space by radiating a laser signal corresponding to a recording pulse having a peak level and a bias level onto an optical recording medium. The optical recording apparatus includes a recording pulse generator to generate the recording pulse by overlapping a fine adjustment pulse with an amplitude less than the peak level and the bias level, and a laser diode to generate the laser signal according to the recording pulse.
1. A method of forming a mark and a space by radiating a laser signal corresponding to a recording pulse train having a peak level pulse and a bias level pulse onto an optical recording medium, the method comprising:
forming the mark and the space using the recording pulse train comprising a fine adjustment pulse, the fine adjustment pulse having an alternating amplitude substantially less than an amplitude defined by a difference between an amplitude of the peak level pulse and an amplitude of the bias level pulse; and
overlapping the peak level pulse with the fine adjustment pulse.
2. The method of claim 1 , wherein the fine adjustment pulse is overlapped on the peak level pulse except during an overdrive interval or a first pulse interval of the recording pulse.
3. The method of claim 1 , wherein a number of pulses making up the fine adjustment pulse is equal to or less than “n” when an interval of the peak level pulse or the bias level pulse is nT, wherein “n” is an integer greater than or equal to 1.
4. The method of claim 1 , wherein the fine adjustment pulse is overlapped with the bias level pulse.
5. The method of claim 1 , further comprising:
forming a domain, which is an area in which a crystal phase is formed on a phase-change optical disc, using multi pulses, in addition to fine adjustment pulses, to prevent the domain from being distorted in a radial or tangential direction of the disc due to thermal accumulation.
6. The method of claim 1 , further comprising:
forming a domain, which is an area in which a crystal phase is formed on an organic pigment optical disc, using a single pulse and at least one fine adjustment pulse.
7. The method of claim 1 , wherein a number of fine adjustment pulses, in the recording pulse, are applied to the peak level pulse or the bias level pulse, wherein the number of fine adjustment pulses is determined based on a length of the mark to be recorded.
8. The method as recited in claim 1 , wherein the bias level pulse is at an erase level or a bottom level.
9. The method of claim 1 , wherein the fine adjustment pulse is applied to the peak level pulse or the bias level pulse to suppress a distortion of the mark due to thermal interference between adjacent marks and thermal accumulation during recording.
10. An optical recording apparatus of forming a mark and a space by radiating a laser signal corresponding to a recording pulse train having a peak level pulse and a bias level pulse onto an optical recording medium, the optical recording apparatus comprising:
a recording pulse generator generating the recording pulse train by overlapping a fine adjustment pulse over the peak level pulse and/or the bias level pulse, the fine adjustment pulse having an alternating amplitude substantially less than an amplitude defined by a difference between an amplitude of the peak level pulse and an amplitude of the bias level pulse; and
a laser diode which generates the laser signal based on the recording pulse train.
11. The apparatus of claim 10 , wherein the recording apparatus reads media information recorded in a lead-in area or lead-out area of the optical recording medium to determine a media type and a power level of the optical recording medium.