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US 7,352,668 B2Granted
Optical disc apparatus manufacturing method and optical disc apparatus
AssigneeKabushiki Kaisha Toshiba
InventorShigeru Shimakawa
Life of this patent
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Abstract
A method for manufacturing an optical disc apparatus including: reading by an optical pickup head a medium on which signals are recorded with appropriate optical power; leading an RF signal corresponding to the recorded signal obtained from the medium by the reading by the optical pickup head to a β value calculation circuit and calculating a β value; and storing the calculated β value as a circuit offset into a circuit offset storage section, and an optical disc apparatus thus manufactured are disclosed.
Claims7
A method for manufacturing an optical disc apparatus, comprising:
- reading by an optical pickup head a reference medium on which signals are recorded with appropriate optical power, to obtain an RF signal;
- leading the RF signal obtained from the reference medium by the reading by the optical pickup head to a β value calculation circuit having an inherent offset;
- estimating a value of the inherent offset by calculating a β value in the β value calculation circuit using the RF signal;
- and
- storing the value of the inherent offset into a circuit offset storage section that is a non-volatile memory.
2 more elements
An optical disc apparatus, comprising:
- an optical writing section configured to record a signal onto a recording medium with writing optical power changed;
- an optical reading section configured to read the signal from the recording medium, to obtain an RF signal;
- a β value calculation circuit, having an inherent offset, configured to calculate a β value using the RF signal;
- a circuit offset storage section configured to prestore a value of the inherent offset possessed by the β value calculation circuit;
- a subtracting section configured to subtract the value of the inherent offset from the β value to create a corrected β value;
- and
- a writing optical power setting section configured to set appropriate writing optical power based on the corrected β value.
4 more elements
Dependencies are inferred from the claim text.