Claims
- 1. An optical recording medium having a phase change recording layer wherein amorphous recorded marks are to be formed, wherein overwriting is conducted by irradiating a laser beam whose intensity is modulated to have at least recording power level and erasing power level; wherein
when the power level at which maximum erasability is achieved in DC erasing operation to crystallize the amorphous recorded marks by DC laser beam irradiation is designated an optimal erasing power level, difference between the DC erasability upon DC laser beam irradiation at a power level not less than said optimal erasing power level and not exceeding the recording power level in the overwriting and said maximum erasability is less than 10 dB.
- 2. The optical recording medium according to claim 1, wherein the recording layer is represented by an atomic ratio composition:
- 3. A method for overwriting the optical recording medium according to claim 1, wherein
when the minimum value of power level at which erasability of at least 32 dB is achieved in the DC erasing operation is designated PeMIN, erasing power level in the overwriting is set at 1.0 to 2.5 folds of PeMIN.
Priority Claims (1)
Number |
Date |
Country |
Kind |
2001-361558 |
Nov 2001 |
JP |
|
CROSS-REFERENCE TO RELATED APPLICATION
[0001] This application claims priority to International Application No. PCT/JP02/12297 filed Nov. 26, 2002 and Japanese Application No. 2001-361558 filed Nov. 27, 2001, and the entire content of both applications is hereby incorporated by reference.
Continuations (1)
|
Number |
Date |
Country |
Parent |
PCT/JP02/12297 |
Nov 2002 |
US |
Child |
10853135 |
May 2004 |
US |