Method and apparatus for recording and reproducing information on and from optical disc
View Patent ↗An apparatus for recording and reproducing an information signal on and from an optical disc includes a memory. The information signal is written into the memory. The information signal is read out from the memory. An optical head generates a laser beam in response to the readout information signal, and applies the laser beam to the optical disc to record the readout information signal on the optical disc. A test signal is recorded on a position of the optical disc near a recording position thereof via the optical head during the writing of the information signal into the memory. The test signal is reproduced from the optical disc. The reproduced test signal is evaluated to generate an evaluation result. An intensity of the laser beam is optimized in response to the evaluation result.
1. A method of optically recording information on an optical disc including first and second recording layers, the method comprising the steps of:
performing a focus jump between the first and second recording layers;
generating a test signal;
detecting a first address for test recording in the first recording layer;
optically recording the generated test signal on the first recording layer at a position corresponding to the detected first address to perform test recording with respect to the first recording layer;
reproducing the recorded test signal from the first recording layer;
evaluating the test signal reproduced from the first recording layer to obtain a first evaluation result;
deciding an optimal recording power for recording with respect to the first recording layer on the basis of said obtained first evaluation result;
detecting a second address for test recording in the second recording layer;
optically recording the generated test signal on the second recording layer at a position corresponding to the detected second address to perform test recording with respect to the second recording layer;
reproducing the recorded test signal from the second recording layer;
evaluating the test signal reproduced from the second recording layer to obtain a second evaluation result;
deciding an optimal recording power for recording with respect to the second recording layer on the basis of said obtained second evaluation result;
optically recording information on the first recording layer;
optically recording information on the second recording layer; and
recording, on a management area of the first recording layer, not only information for identifying an apparatus which made the information recording but also information representative of a manufacturer name for said apparatus.
2. A method of reproducing information from an optical disc on which the information has been recorded by the method of claim 1 , comprising the steps of:
moving an optical pickup along tracks on the first and second recording layers;
making the optical pickup perform a focus jump between the first and second recording layers;
locating the optical pickup with respect to the track on the first or second recording layer; and
optically reproducing information from the track on the first or second recording layer which the optical pickup is located with respect to.
3. An apparatus for optically recording information on an optical disc including first and second recording layers, the apparatus comprising:
means for performing a focus jump between the first and second recording layers;
means for generating a test signal;
means for detecting a first address for test recording in the first recording layer;
means for optically recording the generated test signal on the first recording layer at a position corresponding to the detected first address to perform test recording with respect to the first recording layer;
means for reproducing the recorded test signal from the first recording layer;
means for evaluating the test signal reproduced from the first recording layer to obtain a first evaluation result;
means for deciding an optimal recording power for recording with respect to the first recording layer on the basis of said obtained first evaluation result;
means for detecting a second address for test recording in the second recording layer;
means for optically recording the generated test signal on the second recording layer at a position corresponding to the detected second address to perform test recording with respect to the second recording layer;
means for reproducing the recorded test signal from the second recording layer;
means for evaluating the test signal reproduced from the second recording layer to obtain a second evaluation result;
means for deciding an optimal recording power for recording with respect to the second recording layer on the basis of said obtained second evaluation result;
means for optically recording information on the first recording layer;
means for optically recording information on the second recording layer; and
means for recording, on a management area of the first recording layer, not only information for identifying an apparatus which made the information recording but also information representative of a manufacturer name for said apparatus.
4. An apparatus for reproducing information from an optical disc on which the information has been recorded by the apparatus of claim 3 , comprising:
means for moving an optical pickup along tracks on the first and second recording layers;
means for making the optical pickup perform a focus jump between the first and second recording layers;
means for locating the optical pickup with respect to the track on the first or second recording layer; and
means for optically reproducing information from the track on the first or second recording layer which the optical pickup is located with respect to.
5. An information recording medium comprising:
a first recording layer; and
a second recording layer;
wherein the first recording layer includes a first information area for storing information, a first test area for storing a test signal used to decide an optimal recording power, and a first management area;
wherein the second recording layer includes a second information area for storing information, a second test area for storing a test signal used to decide an optimal recording power, and a second management area; and
wherein at least one of the first management area and the second management area includes an area for storing not only information for identifying an apparatus which made information recording but also information representative of a manufacturer name for said apparatus.