| 摘要 |
The invention relates to an optical recording apparatus on optical carrier or disk, the apparatus has means for sampling a power level of an irradiation beam, e.g. a laser beam, that is capable of recording data in a data region (101) in response to an predefined input signal (NRZ). The irradiation beam (5) has a substantially constant power level in a first period (MT1), where the first period (MT1) is longer than the period of time associated with the maximum code run length (MRL) of the encoding scheme. Forward photo sensing means (FS 41, 40) is adapted to sample the power level in at least a sub-period of time (ST1) of the first period (MT1). The invention relaxes the requirements of the forwarding photo sensing means (FS), as the first period (MT1) may be extended beyond the time that was previously available for monitoring the power level of the irradiation beam.
|
