Optical recording equipment
AssigneesHitachi, Ltd., Hitachi-LG Data Storage, Inc.
InventorsKoichi Watanabe, Hiroyuki Minemura
Life of this patent
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Abstract
In a recording system in which linear velocity during the write operation changes, it is difficult to obtain write strategy parameters in every linear velocity with trial writing. The optimum write strategy condition under the high speed or low speed operation is obtained with trial writing or the like and a value of power compensation is obtained from the frequency characteristic stored in the table. Fluctuation in performance of optical disk drive, deterioration by aging, and temperature characteristic can be compensated.
Claims14
An information recording method for recording information to recording media by irradiating laser beam thereto, comprising the steps for:
- conducting trial writing;
- obtaining frequency characteristic of said laser beam by reproducing said information written by trial writing;
- and
- determining write strategy from said obtained frequency characteristic and recording the information with said write strategy by utilizing a storage means storing frequency characteristic of a laser driver to drive said laser beam.
An information recording equipment, comprising
- a laser source,
- a driver circuit for driving said laser source,
- a table storing frequency characteristics of said driver circuit for driving said laser beam, and
- a write strategy generation circuit for determining write strategy parameters using said table and generating write strategy for the encoded write data.
Dependencies are inferred from the claim text.