Claims
- 1. An optical recording medium for recording information by irradiating the recording medium with a light beam of a first intensity P1 during a first irradiation period .tau.1, with a light beam of a third intensity P3 during a third irradiation period .tau.3 and with a light beam of a second intensity P2 under a predetermined condition, comprising:
- an information recording area provided for recording the information; and
- a recording condition recording area, provided on at least one of an outer circumference side and an inner circumference side of the information recording area, for recording recording condition data, the recording condition data representing the intensities P1, P2, and P3, wherein P1>P2>P3, and irradiation periods .tau.1 and .tau.3 associated with radial positions of the optical recording medium and satisfying a condition {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below 1 for each radial position.
- 2. The optical recording medium according to claim 1, wherein the recording condition recording area stores a radius position data group representing a radius position r of the optical recording medium, a P1 recording condition data group, P2 recording condition data group, P3 recording condition data, .tau.1 recording condition data group and .tau.3 recording condition data group representing the intensities P1, P2, P3 and irradiation periods .tau.1, .tau.3 corresponding to the radial positions represented by the radial position data and satisfying the condition
- {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below unity.
- 3. The recording condition recording area according to claim 1, wherein the recording condition recording area stores radius position data r and recording condition data P1, P2, P3, .tau.1 and .tau.3 associated therewith as a group for each radius position.
- 4. The optical recording medium according to claim 1, wherein the recording condition recording area stores, in accordance with a predetermined order of the radial positions of the optical recording medium, the recording condition data P1, P2, P3, .tau.1 and .tau.3 representing the intensities P1, P2, P3 (P1>P2>P3) and irradiation periods .tau.1, .tau.3 of the light beam and satisfying the condition
- {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below unity.
- 5. The optical recording medium according to claim 1, wherein the recording condition recording area stores, at least .tau.3 of the intensities P1, P2, P3 and irradiation periods .tau.1, .tau.3 of the light beam for each of a plurality of radial positions of the information recording area.
- 6. An optical recording apparatus for recording information on an optical recording medium comprising:
- an light beam irradiation unit for transmitting a light beam to the recording medium; and
- a control unit that controls the light beam so as to irradiate the optical recording medium with the light beam having a first intensity P1 during a first irradiation period .tau.1 so as to form an amorphous state area at the recording medium, the light beam having a third intensity P3 during a third irradiation period .tau.3 and the light beam having a second intensity P2 so as to form a crystal state area, wherein the optical recording medium comprises:
- an information recording area provided for recording the information; and
- a recording condition recording area, provided on at least one of an outer circumference side and an inner circumference side of the information recording area, for recording recording condition data, the recording condition data representing the intensities P1, P2, and P3, wherein P1>P2>P3, and irradiation intervals .tau.1 and .tau.3 associated with radial positions of the optical recording medium and satisfying a condition {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below 1 for each radial position.
- 7. The optical recording apparatus according to claim 6, wherein the recording condition recording area stores a radius position data group representing a radius position r of the optical recording medium, a P1 recording condition data group, P2 recording condition data group, P3 recording condition group, .tau.1 recording condition data group and .tau.3 recording condition data group representing the intensities P1, P2, P3 and irradiation periods .tau.1, .tau.3 corresponding to the radial positions representing the radius position data and satisfying the condition
- {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below unity.
- 8. The optical recording apparatus according to claim 6, wherein the recording condition recording area stores radial position data r and the recording condition data P1, P2, P3, .tau.1 and .tau.3 associated with each radial portion of the recording medium as a group for each radial position.
- 9. The optical recording apparatus according to claim 6, wherein the recording condition recording area records, in accordance with a predetermined order of the radial positions, the recording condition data P1, P2, P3, .tau.1, .tau.3 representing the intensities P1, P2, P3 (P1>P2>P3) and irradiation periods .tau.1, .tau.3 and satisfying the condition
- {(P2-P3).times..tau.3}/{(P1-P2).times..tau.1}=below unity.
- 10. The optical recording apparatus according to claim 6, wherein the recording condition recording area stores recording condition data representing at least .tau.3 of the intensities P1, P2, P3 and irradiation periods .tau.1, .tau.3 for each of a plurality of radial positions of the information recording area.
- 11. The optical recording apparatus according to claim 6, further comprising
- recording condition data detecting means for, prior to recording the information into the recording medium, detecting the recording condition data from the recording condition recording area and
- determining means for, on the basis of the recording condition data detected by the recording condition data detecting means, determining at least .tau.3 of the intensities P1, P2, P3 and irradiation periods .tau.1, .tau.3 of the light beam for each of a plurality of radius positions of the information recording area.
- 12. The optical recording apparatus according to claim 11, the determining means comprises
- means for setting a plurality of radial areas into which the information recording area is divided,
- determining means for determining a specific .tau.3 for each of the plurality of radial areas set by the setting means.
- 13. The optical recording apparatus according to claim 11, wherein the determining means comprises:
- setting means for setting a plurality of radial areas into which the information recording area is divided,
- determining means for determining a specific .tau.3 for each of the plurality of radial areas set by the setting means, and
- means for calculating an interpolated .tau.3 through an interpolation processing of the determined .tau.3 relative to the plurality of radial areas set by the setting means.
Priority Claims (2)
Number |
Date |
Country |
Kind |
6-264085 |
Oct 1994 |
JPX |
|
7-280778 |
Oct 1995 |
JPX |
|
CROSS-REFERENCE TO THE RELATED APPLICATIONS
This application is a continuation-in-part of U.S. patent application Ser. No. 08/548,469, filed Oct. 26, 1995 pending.
US Referenced Citations (4)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0 265 971 |
May 1988 |
EPX |
0 286 126 |
Oct 1988 |
EPX |
5-32811 |
May 1993 |
JPX |
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
548469 |
Oct 1995 |
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