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US 7,126,896 B2Granted
Information recording method, recording condition detection method, and information recording apparatus
AssigneeNEC Corporation
InventorSeiichiro Miyaki
Life of this patent
Estimating the term…
Abstract
A plurality of pits representing recording target information are formed on an optical disk, while a laser light having a predetermined power is irradiated onto the optical disk. When information is being recorded, a condition index representing a recording condition of the optical disk is derived with the use of an equation which is changeable in accordance with the kind of the optical disk and the operational environment of a recording apparatus. The power of the laser light irradiated onto the optical disk is adjusted so that the recording condition may be a predetermined recording condition based on the derived condition index.
Claims22
An information recording method of recording information on an optical disk, comprising:
- an information recording step of forming a plurality of pits representing recording target information on said optical disk by controlling a power of a laser light to be irradiated onto said optical disk;
- condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed;
- and
- a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step,
- wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and
- wherein said equation is represented by Rm=Sp/Ss/Pw1γ (where Rm represents said condition index, Sp represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable, Ss represents a level of a portion of a reflection light from said optical disk in case of a pit not being formed, in which portion a light intensity is stable, and γ represents said coefficient determined in accordance with the kind of said optical disk and the environment in which information recording is performed),
- said information recording method further comprises:
- a first detecting step of detecting the level Sp;
- and
- a second detecting step of detecting the level Ss, and
- said condition detecting step includes a step of deriving said condition index Rm by using the detected levels Sp and Ss, and said equation, in a case where a velocity along tracks of said optical disk is constant.
8 more elements
An information recording method of recording information on an optical disk, comprising:
- an information recording step of forming a plurality of pits representing recording target information on said optical disk-by controlling a power of a laser light to be irradiated onto said optical disk;
- condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed;
- and
- a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step,
- wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and
- wherein said equation is represented by Rm=Sp/Ref/Pw1γ (where Rm represents said condition index, Sp represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable, Ref represents a reflection ratio of said optical disk, Pw1 represents a power of a laser light for forming a pit, and γ represents said coefficient determined in accordance with the kind of said optical disk and environment in which information recording is performed),
- said information recording method further comprises a level detecting step of detecting the level Sp, and
- said condition detecting step includes a step of deriving said condition index Rm by using the detected level Sp and said equation, in a case where a velocity along tracks of said optical disk is constant.
5 more elements
An information recording method of recording information on an optical disk, comprising:
- an information recording step of forming a plurality of pits representing recording target information on said optical disk by controlling a power of a laser light to be irradiated onto said optical disk;
- condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed;
- and
- a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step,
- wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and
- wherein said equation is represented by Rm=Sp/Pw1γ (where Rm is said condition index, Sp represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable, Pw1 represents a power of a laser light for forming a pit, and γ represents said coefficient determined in accordance with the kind of said optical disk and the environment in which information recording is performed),
- said information recording method further comprises a level detecting step of detecting the level Sp, and
- said condition detecting step includes a step of deriving said condition index Rm by using the detected level Sp and said equation, in a case where a velocity along tracks of said optical disk is constant.
5 more elements
An information recording method of recording information on an optical disk, comprising:
- an information recording step of forming a plurality of pits representing recording target information on said optical disk by controlling a power of a laser light to be irradiated onto said optical disk;
- condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed;
- and
- a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step,
- wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and
- wherein said equation is represented by Rm=Spk×α×γ−Sp (where Rm represents said condition index, Spk represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity reaches a peak, α represents a correction coefficient for correcting the peak level, γ represents said coefficient determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and Sp represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable),
- said information recording method further comprises:
- a peak detecting step of detecting the level Spk;
- and
- a level detecting step of detecting the level Sp, and
- said condition detecting step includes a step of deriving said condition index Rm by using the detected levels Spk and Sp, and said equation, in a case where a velocity along tracks of said optical disk is constant.
8 more elements
An information recording method of recording information on an optical disk, comprising:
- an information recording step of forming a plurality of pits representing recording target information on said optical disk by controlling a power of a laser light to be irradiated onto said optical disk;
- condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed;
- and
- a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step,
- wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and
- wherein said equation is represented by Rm=(Spk×α×γ−Sp)×Pw1 (where Rm represents said condition index, Spk represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity reaches a peak, α represents a correction coefficient for correcting the peak level, γ represents said coefficient determined in accordance with the kind of said optical disk and the environment in which information recording is performed, Sp represent a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable, and Pw1 represents a power of a laser light for forming a pit),
- said information recording method further comprises:
- a peak detecting step of detecting the level Spk;
- and
- a level detecting step of detecting the level Sp, and
- said condition detecting step includes a step of deriving said condition index Rm by using the detected levels Spk and Sp and said equation, in a case where a velocity along tracks of said optical disk is constant.
8 more elements
An information recording method of recording information on an optical disk, comprising:
- an information recording step of forming a plurality of pits representing recording target information on said optical disk by controlling a power of a laser light to be irradiated onto said optical disk;
- condition detecting step of deriving a condition index representing a recording condition of said optical disk, while the laser light is irradiated onto said optical disk in said information recording step, by using an equation which is changeable in accordance with a kind of said optical disk and an environment in which information recording is performed;
- and
- a power adjusting step of adjusting the power of the laser light to be irradiated in said information recording step, in order that said recording condition may be a predetermined recording condition, based on said condition index derived in said condition detecting step,
- wherein said equation includes a coefficient which is determined in accordance with the kind of said optical disk and the environment in which information recording is performed, and
- wherein said equation is represented by Rm=(Spk×α×γ−Sp)Ss (Rm represents said condition index, Spk represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity reaches a peak, α represents a correction coefficient for correcting the peak level, γ represents said coefficient determined in accordance with the kind of said optical disk and the environment in which information recording is performed, Sp represents a level of a portion of a reflection light from said optical disk in case of a pit being formed, in which portion a light intensity is stable, and Ss represents a level of a portion of a reflection light from said optical disk in case of a pit not being formed, in which portion a light intensity is stable),
- said information recording method further comprises:
- a peak detecting step of detecting the level Spk;
- a first level detecting step of detecting the level Sp;
- and
- a second level detecting step of detecting the level Ss, and
- said condition detecting step includes a step of deriving said condition index Rm by using the detected levels Spk, Sp, and Ss, and said equation, in a case where a velocity along tracks of said optical disk is constant.
9 more elements
Dependencies are inferred from the claim text.