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. An optical disc ejectable from a recording apparatus and comprising a plurality of layers on and from which information can be recorded and reproduced, wherein apparatus information containing an information piece representative of a name of a manufacturer of an apparatus for recording and reproducing information on and from the disc is stored in one of the layers,
wherein the apparatus information further contains an information piece representative of a serial number of the apparatus.
2. A method of recording and reproducing an information signal on and from a disc via an information recording and reproducing apparatus, the disc comprising a plurality of layers on and from which information can be recorded and reproduced, the method comprising the steps of:
deciding an optimum condition of the apparatus for each of the layers in the disc; and
recording an information piece representative of the decided optimum condition, an information piece representative of a name of a manufacturer of the apparatus, and an information piece representative of a serial number of the apparatus on one of the layers in the disc.
3. A method of recording and reproducing an information signal on and from a disc via an information recording and reproducing apparatus using a laser beam applied to the disc, the disc comprising a plurality of layers on and from which information can be recorded and reproduced, the method comprising the steps of:
recording a test signal on each of the layers in the disc;
reproducing the test signal from each of the layers in the disc;
deciding an optimum condition of the laser beam for information recording in response to the reproduced test signal; and
recording an information piece representative of the decided optimum condition, an information piece representative of a name of a manufacturer of the apparatus, and an information piece representative of a serial number of the apparatus on one of the layers in the disc.