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AssigneeSony Corporation
InventorsTetsuji Kawashima, Futoshi Tsukada, Kunihiko Miyake, Shinji Ohta, Masazumi Shiozawa
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An optical disc having a power calibration area for calibrating the power of a data recording laser beam. The power calibration area is provided at an inner peripheral part of the disc and has test areas and count areas. The test areas are provided to accomplish trial writing of data, and the count areas are provided to record data representing the use condition of the test areas. Data is recorded on the optical disc, while calibrating the data recording laser beam. The number of the test areas is increased in accordance with an increase in the recording density of the optical disc. The optical disc may be a double-density CD. In this case, the disc has 800 to 1200 test areas. The test areas have the smallest possible size, and the count areas are provided in the smallest possible number. Therefore, the disc can have sufficiently large data regions. Thus, the power of the data recording laser beam can be therefore adjusted many times. The amount of data that can be recorded on the optical disc therefore increase.
An optical disc having a power calibration area for calibrating the power of a data-recording laser beam, wherein the power calibration area is provided at an inner peripheral part of the disc and comprises test areas and count areas, the test areas are provided to accomplish trial writing of data, the count areas are provided to record data representing use condition of the test areas, and a number of the test areas is increased in accordance with an increase in recording density of the optical disc.
An optical disc having a pregroove wobbling at a predetermined frequency and a power calibration area for calibrating the power of a data-recording laser beam, wherein the power calibration area is provided at an inner peripheral part of the optical disc and comprises test areas and count areas, the test areas are provided to accomplish trial writing of data, the count areas are provided to record data representing the use condition of the test areas, and a number of the test areas ranges from 800 to 1200.
A data recording apparatus for recording data on an optical disc by calibrating the power of a data recording laser beam, said optical disc having a calibration area which is provided at an inner peripheral part of the optical disc and which comprises test areas for accomplishing trial writing of data and count areas for recording data representing use condition of the test areas, said apparatus comprising:
A data recording method for recording data on an optical disc by calibrating the power of a data recording laser beam, wherein the optical disc comprises a calibration area provided at an inner peripheral part of the optical disc and comprising test areas for accomplishing trial writing of data and count areas for recording data representing the use condition of the test areas, wherein the number of the test areas is increased in accordance with an increase in the recording density of the optical disc.
Dependencies are inferred from the claim text.