Optical disk device
AssigneeTEAC Corporation
InventorToshihiro Ogawa
Life of this patent
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Abstract
The present invention provides an optical disk device which optimizes recording power level used when recording data. A controller records test data in a test region of an optical disk and evaluates reproduced signal quality of the test data, so as to determine an optimum recording power level Po (OPC). Subsequently, the controller uses reflected light intensity level B obtained when recording data to make adjustments to the optimum recording power level Po, thereby obtaining recording power level P. The recording power level P is adjusted such that Bm/Pn=constant, where m and n are positive rational numbers satisfying m<n. When m=1, the value of n is greater than or equal to 1.5 and no larger than 10.
Claims17
An optical disk device, comprising:
- means for recording test data in a predetermined region of an optical disk using a plurality of recording power levels;
- means for setting an optimum recording power level Po based on reproduced signal quality of the test data;
- and
- means for adjusting the optimum recording power level Po in accordance with an intensity level B of reflected light from the optical disk, when recording data in a data region of the optical disk;
- wherein
- said means for adjusting adjusts the optimum recording power level Po such that a recording power P used when recording the data satisfies the following equation:
- Bm/Pn=Bom/Pon=constant
- where m and n are positive rational numbers satisfying m<n, and Bo denotes a standard reflected light intensity level obtained when using the optimum recording power level Po.
An optical disk device, comprising:
- a laser diode which records data by irradiating on an optical disk a laser beam having a recording power;
- a photodetector which receives a reflected light from the optical disk and outputs a reflection signal in accordance with the reflected light intensity;
- a controller which adjusts the recording power by, during execution of OPC, recording test data while varying the recording power level to determine an optimum recording power level, and, during execution of ROPC, adjusting the optimum recording power level in accordance with the reflected light intensity from the optical disk;
- and
- a memory which stores parameters m and n, where m and n are positive rational numbers satisfying m<n;
- wherein
- said controller reads out the parameters m and n stored in said memory and adjusts the optimum recording power level such that the following equation holds true:
- Bm/Pn=Bom/Pon=constant
- where P denotes a recording power level after adjustment, Po denotes the optimum recording power level, Bo denotes a standard reflected light intensity level obtained when using the optimum recording power level Po during execution of OPC, and B denotes a reflected light intensity level during execution of ROPC.
Dependencies are inferred from the claim text.