Optical recording method, optical recording medium, optical recording medium recording apparatus, optical recording apparatus, optical disk, and optical disk recording/reproducing apparatus

Patent metadata

Field	Value
Publication number	US-9418694-B2
Application number	US-201514679045-A
Country	US
Kind code	B2
Filing date	Apr 6, 2015
Priority date	Feb 19, 2003
Publication date	Aug 16, 2016
Grant date	Aug 16, 2016

Abstract

A mark having a length nT (n being an integer equal to or greater than 3 and T being a clock period) is formed by modulating irradiation laser power with three values of recording power Pw, erase power Pe, and bias power Pb (Pw>Pe>Pb). Constant strength periods (A t ) of the recording power Pw are set as A t T, A 1 T, . . . , and A m T and constant strength periods (B t ) of the bias power Pb are set as B t T, B 1 T, . . . , B m T, and CT (C=−1 to 3). The application of laser is divided into pulses in order of A t T, B t T, A 1 T, B 1 T, . . . , A m T, B m T, and CT (m=(n−k)/2, k=3 (if n is an odd number), or k=4 (if n is an even number)). (Here, the constant strength period of the recording power Pw for n=3, n=4, n≧5 (odd number), and n≧6 (even number) is set as A t3 , A t4 , A tod , and A tev , the constant strength period of the bias power Pb for n=3, n=4, n≧5 (odd number), and n≧6 (even number) is set as B t3 , B t4 , B tod , and B tev , and then, A t3 +B t3 =A tod +B tod =A m +B m =2T and A t4 +B t4 =A tev +B tev =3T).

First claim

The invention claimed is:

1. An optical recording and reproducing apparatus for generating a recording strategy having a period of a halved clock of a clock period T of recording data, as a base period, to form recording marks corresponding to lengths nT of recording data, where n is a variable integer, by modulating laser power of a laser beam for irradiation by using three values being a recording power Pw, an erase power Pe, and a bias power Pb, such that Pw >Pe >Pb, the apparatus, comprising:
an applying unit configured to apply a top heating pulse, an applying unit configured to apply an intermediate heating pulse, and an applying unit configured to apply a rear-end heating pulse section including a rear-end heating pulse, as the recording strategy, to form a recording mark, based on the period of the halved clock, corresponding to a length of recording data out of nT lengths of recording data, the top heating pulse being the first pulse having the recording power Pw in the recording strategy, the rear-end heating pulse being the last pulse having the recording power Pw in the recording strategy, the intermediate heating pulse being a pulse between the top heating pulse and the rear-end heating pulse, rising from the bias power Pb to the recording power Pw, keeping the recording power Pw in a first duration, and falling from the recording power Pw to the bias power Pb, the first duration being a first width of the intermediate heating pulse, the first width being set by using a first parameter corresponding to the first duration, wherein
the applying unit configured to apply the rear-end heating pulse section, comprises:
a setting unit configured to set a first set of three time sections for an even-T length of recording data out of the nT lengths of recording data, including:
a first time section having only the bias power Pb and occurring before the rear-end heating pulse, the first time section being sequentially adjacent to the rear-end heating pulse;
a second time section being only the rear-end heating pulse, the rear-end heating pulse rising from the bias power Pb to the recording power Pw, keeping the recording power Pw in a second duration, and falling from the recording power Pw, the second time section being a time section from a rise time of the rear-end heating pulse to a fall time of the rear-end heating pulse, the second duration being a second width of the second time section, the second width being set independent from the first width of the intermediate heating pulse by using at least a second parameter corresponding to the second duration that is different from the first parameter; and
a third time section being a cooling power section after the rear-end heating pulse, the cooling power section including a time section from a sequentially adjacent clock time to a termination time of a cooling pulse, a period of the third time section being set by using at least a third parameter; and

a setting unit configured to set a second set of three time sections for an odd-T length of recording data out of the nT lengths of recording data, including:
a fourth time section having only the bias power Pb and occurring before the rear-end heating pulse, the fourth time section being sequentially adjacent to the rear-end heating pulse, the fourth time section being set independent from the first time section;
a fifth time section being only the rear-end heating pulse, the rear-end heating pulse rising from the bias power Pb to the recording power Pw, keeping the recording power Pw in a third duration, and falling from the recording power Pw, the fifth time section being a time section from a rise time of the rear-end heating pulse to a fall time of the rear-end heating pulse, the third duration being a third width of the fifth time section, the third width being set independent from both the first width of the intermediate heating pulse and the second width of the second time section by using at least a fourth parameter corresponding to the third duration which is different from both the first and second parameters; and
a sixth time section being a cooling power section after the rear-end heating pulse, the cooling power section including a time section from a sequentially adjacent clock time to a termination time of a cooling pulse, a period of the sixth time section being set independent from that of the third time section by using at least a fifth parameter that is different from the third parameter.

2. The optical recording and reproducing apparatus according to claim 1 , further comprising:
a signal processor configured to amplify a signal reproduced from an optical disk, and convert the signal into a digital signal, when the optical disk is rotated in order to reproduce a recorded signal recorded thereon, and an optical pickup is being servo-controlled; and
a jitter generator configured to generate a jitter signal based on the signal reproduced from the optical disk.

3. An optical recording and reproducing apparatus, comprising:
when a mark corresponding to data having a length nT is formed by modulating a laser power of a laser beam with three values of recording power Pw, erase power Pe, and bias power Pb, a relationship between the recording power Pw, the erase power Pe, and the bias power Pb being Pw>Pe>Pb, where n is an integer and T is a clock period of a recording data,
a linear speed determination unit configured to determine linear speed information used to record information on an optical disk;
a first recording strategy generator configured to generate a first recording strategy based on the linear speed information determined by the linear speed determination unit, the first recording strategy employing the clock period T as a base period to be used for a low linear speed, the first recording strategy being for recording a top recording section, an intermediate multi-pulse section, and a rear-end cooling power section among divided recording pulses for forming a recording mark based on the clock period T; and
a second recording strategy generator configured to generate a second recording strategy based on the linear speed information determined by the linear speed determination unit, the second recording strategy employing a period pT, where p is an integer of 2 or more, obtained by dividing the clock period T by p as a base period to be used for a high linear speed, the second recording strategy being for recording a bias power section before a rear-end recording pulse, a rear-end recording pulse section, and a cooling power section among divided recording pulses for forming a recording mark based on the period pT, the bias power section, the rear-end recording pulse section, and the cooling power section being changed according to the period pT.

4. The optical recording and reproducing apparatus according to claim 3 , further comprising:
a signal processor configured to amplify a signal reproduced from the optical disk, and convert the signal into a digital signal, when the optical disk is rotated in order to reproduce a recorded signal recorded thereon, and an optical pickup is being servo-controlled; and
a jitter generator configured to generate a jitter signal based on the signal reproduced from the optical disk.

5. An optical recording and reproducing apparatus, comprising:
when a mark corresponding to data having a length nT is formed by modulating a laser power of a laser beam with three values of recording power Pw, erase power Pe, and bias power Pb, a relationship between the recording power Pw, the erase power Pe, and the bias power Pb being Pw>Pe>Pb, where n is an integer and T is a clock period of a recording data,
a linear speed determination unit configured to determine linear speed information used to record information on an optical disk;
a first recording strategy

Assignees

• Jvc Kenwood Corp

Inventors

• Tabata Hiroshi
• Yonehara Kazuo
• Ueki Yasuhiro

Classifications

• G11B2020/10898

  Overwriting or replacing recorded data · CPC title

• G11B2007/24316

  group 16 elements (i.e. chalcogenides, Se, Te) · CPC title

• G11B20/10222

  clock-related aspects, e.g. phase or frequency adjustment or bit synchronisation (dedicated sync patterns in the modulation code G11B20/1403) · CPC title

• G11B7/0062

  Overwriting strategies, e.g. recording pulse sequences with erasing level used for phase-change media · CPC title

• G11B7/00456 Primary

  Recording strategies, e.g. pulse sequences (G11B7/0062 takes precedence) · CPC title