Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Patent
1998-07-01
2000-09-26
Dinh, Tan
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
369116, 369 54, G11B 1100
Patent
active
061250856
ABSTRACT:
A method and apparatus are provided for optimally controlling the width of recording marks formed by a light beam on an optical recording medium in an optical recording apparatus. The method is accomplished by selecting and storing in a storage device a predetermined optimal read signal value, and then setting a plurality of selectable predetermined recording conditions in the optical recording apparatus. These conditions differ from one another in the quantity of light in the light beam, or in the strength of an external magnetic field. In the optical recording apparatus, a set of first test patterns then are recorded by the light beam on separate first tracks of the optical recording medium under each of the predetermined conditions. Similarly, a second test track is recorded onto the optical recording medium under the same predetermined conditions adjacent to each of the first test tracks. The first test tracks are thereafter read by the optical recording apparatus, and the amplitude of the read signals is stored in the storage device, along with an indication of the predetermined recording signal condition under which it was generated. Finally, using a comparison device, the stored signal quantities are compared to the predetermined optimal read signal value. The optimal one of the predetermined recording conditions to be used by the optical recording apparatus is determined to be the condition associated with the one of the stored signals that most closely approximates the predetermined optimal signal value.
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Fuji Hiroshi
Maeda Shigemi
Okumura Tetsuya
Conlin David G.
Dinh Tan
Sharp Kabushiki Kaisha
Tucker David A.
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