Optical recording regeneration apparatus with compensation circuit
AssigneeSeiko Epson Corporation
InventorTakao Miyazawa
Life of this patent
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Abstract
An optical recording regeneration apparatus with a compensation circuit is provided. In the apparatus, a recording state detection circuit detects the recording state of recorded data and generates state data indicative of the recording state. A modulation control circuit compares the state data with a specified value and generates the comparison results. A drive circuit adjusts the power level and/or the pulse width of the laser beam in accordance with the comparison results. Thus, the power level and/or the pulse width of the laser beam can maintain at an optimum value without being affected by variations in disk recording sensitivity resulting from temperature or other changes over time.
Claims28
An optical recording regeneration apparatus for recording data on a recording medium having a plurality of tracks spaced apart in a radial direction of the medium, each track including a plurality of sectors with each sector having a data region and a calibration region, the apparatus comprising:
- optical means for providing a laser beam for recording a test pattern of data in a calibration region of a sector on a track on the medium for initial calibration and for recording a data pattern in a data region of the sector on the track on the medium;
- signal regeneration means for reading out data patterns from the medium, said signal regeneration means reading out the test pattern from the calibration region and the data pattern from the data region of the sector on the track;
- recording state detection means, responsive to said signal regeneration means, for detecting the recording state of the test pattern and the data pattern read out by said signal regeneration means and for generating state data indicative of the corresponding recording state, said recording state detection means detecting the recording state of the data pattern read out from the data region at the time when the data pattern is being verified and generating associated state data;
- modulation control means, responsive to said recording state detection means, for controlling the power level of the laser beam, said modulation control means including comparison means for comparing the state data generated by said recording state detection means with specified values and providing comparison results;
- and
- drive means, responsive to said modulation control means, for driving said optical means, for adjusting the power level of the laser beam in accordance with the comparison results associated with the state data of the test pattern in the calibration region for initial recording and for adjusting the power level of the laser beam in accordance with the comparison results associated with the state data of the data pattern in the data region so as to maintain the power level of the laser beam at an optimum value for subsequent recording.
An optical recording regeneration apparatus for recording data on a recording medium having a plurality of tracks spaced apart in a radial direction of the medium, each track including a plurality of sectors with each sector having a data region and a calibration region, the apparatus comprising:
- optical means for providing a laser beam for recording a test pattern of data in a calibration region of a sector on a track on the medium for initial calibration and for recording a data pattern in a data region of the sector on the track on the medium;
- signal regeneration means for reading out data patterns from the medium, said signal regeneration means reading out the test pattern from the calibration region and the data pattern from the data region of the sector on the track;
- recording state detection means, responsive to said signal regeneration means, for detecting the recording state of the test pattern and the data pattern read out by said signal regeneration means and for generating state data indicative of the corresponding recording state, said recording state detection means detecting the recording state of the data pattern read out from the data region at the time when the data pattern is being verified and generating associated state data;
- modulation control means, responsive to said recording state detection means, for controlling the power level and the pulse width of the laser beam, said modulation control means including comparison means for comparing the state data generated by said recording state detection means with specified values and providing comparison results;
- and
- drive means, responsive to said modulation control means, for driving said optical means, for adjusting the power level and the pulse width of the laser beam in accordance with the comparison results associated with the state data of the test pattern in the calibration region for initial recording and for adjusting the power level and the pulse width of the laser beam in accordance with the comparison results associated with the state data of the data pattern in the data region so as to maintain the power level and the pulse width of the laser beam at optimum values for subsequent recording.
A method for recording data on a recording medium having a plurality of tracks spaced apart in a radial direction of the medium, each track including a plurality of sectors with each sector having a data region and a calibration region, the method comprising the steps of:
- recording a test pattern of data in a calibration region of a sector on a track of the medium using a laser beam;
- detecting the recording state of the test pattern in the calibration region of the sector to generate state data indicative of the recording state;
- adjusting the power level of the laser beam in accordance with the state data of the test pattern to provide an adjusted laser beam;
- recording data pattern in a data region of the sector using the adjusted laser beam;
- detecting the recording state of the data pattern in the data region of the sector to generate associated state data;
- and
- adjusting the power level of the adjusted laser beam in accordance with the associated state data of the data pattern to provide a finely adjusted laser beam for subsequent data recording in another sector of the medium.
A method for recording data on a recording medium having a plurality of tracks spaced apart in a radial direction of the medium, each track including a plurality of sectors with each sector having a data region and a calibration region, the method comprising the steps of:
- recording a test pattern of data in a calibration region of a sector on a track of the medium using a laser beam;
- detecting the recording state of the test pattern in the calibration region of the sector to generate state data indicative of the recording state;
- adjusting the power level and the pulse width of the laser beam in accordance with the state data of the test pattern to provide an adjusted laser beam;
- recording data pattern in a data region of the sector using the adjusted laser beam;
- detecting the recording state of the data pattern in the data region of the sector to generate associated state data;
- and
- adjusting the power level and the pulse width of the adjusted laser beam in accordance with the associated state data of the data pattern to provide a finely adjusted laser beam for subsequent data recording in another sector of the medium.
Dependencies are inferred from the claim text.