Recording power adjusting method and optical information record apparatus using the same
AssigneeNEC Corporation
InventorsShuichi Okubo, Minoru Akiyama
Life of this patent
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Abstract
A signal of a test pattern is recorded on a center track among three adjacent tracks placed in a test region while changing recording power, and a signal of a test pattern is recorded on tracks adjacent to both sides while changing the recording power with the same timing. The center track is reproduced to measure reproduction signal characteristics, and the optimum recording power is adjusted based on the reproduction signal characteristics. As a result of this, the optimum recording power considering an influence of cross erasing effect can be adjusted, and the recording power can be adjusted efficiently under a high-density recording condition, particularly a narrow track pitch condition.
Claims22
A recording power adjusting method for adjusting recording power of a light source when recording information on an optical information record medium by irradiating a light beam from the light source, comprising the steps of:
- recording a test pattern signal on a center track of adjacent three tracks of the optical information record medium while changing the recording power;
- recording the test pattern signal on each of tracks adjacent to both sides of the center track in substantial alignment on a scan line with a region of the center track where the test pattern signal is recorded while changing the recording power;
- reproducing the test pattern signal recorded on the center track to measure characteristics of the reproduced signal;
- and
- adjusting the recording power of the light source based on the measured characteristics of the reproduced signal.
A recording power adjusting method for adjusting recording power of a light source when recording information on an optical information record medium by irradiating a light beam from the light source, wherein the optical information record medium is provided with a plurality of test regions including a set of a center track and tracks adjacent to both sides of the center track, comprising the steps of:
- recording test pattern signals on the center track once and on the adjacent tracks more than once while changing the recording power with respect to each test region;
- reproducing the test pattern signal recorded on the center track to measure characteristics of the reproduced signal with respect to each test region;
- and
- adjusting the recording power of the light source based on the characteristics of the reproduced signal measured with respect to each test region.
An optical information record apparatus for recording information on an optical information record medium by irradiating a light beam from a light source, comprising:
- a means of recording a test pattern signal on a center track of adjacent three tracks of the optical information record medium while changing the recording power;
- a means of recording the test pattern signal on each of tracks adjacent to both sides of the center track in a region in substantial alignment with a region of the center track where the test pattern signal is recorded on a scan line while changing the recording power;
- a means of reproducing the test pattern signal recorded on the center track to measure characteristics of the reproduced signal;
- and
- a means of adjusting the recording power of the light source based on the measured characteristics of the reproduced signal.
Dependencies are inferred from the claim text.