US5732061A
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US
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Recording method using trial write test pattern
Assignee: Hitachi Consumer Electronics Co Ltd
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Filing: 1996-10-11
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Granted: 1998-03-24
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Expires: 2016-10-11
Abstract
Abstract In a write control method on an optical recording, at least one shift amount selected from the defocus amount of a laser beam on a recording medium, the shift amount of a recording position on a recording track and the shift amount of laser power during recording is controlled such that the selected amount falls within a predetermined range. Subsequently, a trial signal is trially recorded at a plurality of trial zones on the recording medium by using a laser power value as a parameter. The recorded trial signal is read and a difference ΔV between center levels of a highest density waveform and a lowest density waveform is detected. In connection with each trial zone, the laser power value when a reading trial signal which makes the difference ΔV minimum is recorded is defined as an optimum recording power value. Regular data is recorded at a predetermined storage area on the recording medium by using an optimum laser power value determined in connection with a trial zone closest to the predetermined storage area.
Inventors
- 👤 Fumiyoshi Kirino
- 👤 Takeshi Maeda
- 👤 Hiroshi Ide
- 👤 Toshimitsu Kaku
- 👤 Seiichi Mita
- 👤 Kazuo Shigematsu
- 👤 Tsuyoshi Toda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:27
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/12; G11B7/125; G11B7/126; G11B11/00; G11B11/10; G11B11/105; G11B11/10502; G11B11/1053; G11B11/10595; G11B20/00; G11B20/10; G11B20/10009; G11B20/10046; G11B20/10212; G11B20/18; G11B20/1816; G11B7/004; G11B7/0045; G11B7/1267; G11B11/10504; G11B11/10506; G11B11/10508; G11B20/12; G11B20/1217; G11B20/1258; G11B7/24; G11B7/2407; G11B7/24085
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
72 words
A control method of recording at magneto-optical recording wherein when recording, reading or erasing of optical recording is performed by using at least a laser beam and an externally applied magnetic field, a low recording level portion having a predetermined duration is provided between adjacent recording pulses, and more preferably, heat flow generated from a recording pulse is controlled by said portion to suppress interference due to heat between respective recording marks.
Claim 2
Dependent Claim
72 words
A control method of recording at magneto-optical recording wherein when recording, reading or erasing of optical recording is performed by using at least a laser beam and an externally applied magnetic field, a low recording level portion having a predetermined duration is provided between adjacent recording pulses, and more preferably, heat flow generated from a recording pulse is controlled by said portion to suppress interference due to heat between respective recording marks.
Claim 3
Dependent Claim
29 words
The control method of a magneto-optical recording according to claim 1 wherein at least two or more levels are used in a data recording region of said recording pulse.
Claim 4
Dependent Claim
44 words
The control method of a magneto-optical recording according to claim 1 wherein said recording pulse for each respective recording mark has intermittent and fine pulses in a data recording region, and a leading pulse has a longer pulse width than that of ensuing pulses.
Claim 5
Dependent Claim
60 words
The control method of a magneto-optical recording to claim 1 wherein said recording pulse for each respective recording mark has intermittent and fine pulses in a data recording region, and a pulse width of a pulse is controlled by a recording clock and is made to be an integer fraction of a detection window width formed by the recording clock.
Claim 6
Dependent Claim
60 words
The control method of a magneto-optical recording to claim 1 wherein said recording pulse for each respective recording mark has intermittent and fine pulses in a data recording region, and a pulse interval between adjacent pulses is controlled by a recording clock and is made to be an integer fraction of a detection window width formed by the recording clock.
Claim 7
Dependent Claim
45 words
The control method of a magneto-optical recording to claim 1 wherein said recording pulse for each respective recording mark has intermittent and fine pulses in a data recording region, and at least a leading pulse has a lower power level than that of ensuing pulses.
Claim 8
Dependent Claim
77 words
The control method of a magneto-optical recording wherein when recording, reproduction or erase of optical recording is performed by using at least a laser beam and an externally applied magnetic field according to claim 1, the duration of a low recording level portion having a predetermined duration and provided between adjacent recording pulses is controlled by a recording clock and is made to be an integer fraction of a detection window width formed by the recording clock.
Claim 9
Independent Claim
219 words
A method of controlling recording of optical records, comprising the steps of: setting a plurality of trial recording zones in a recording region on an optical recording medium; trailly recording a predetermined trial data signal on each of said plurality of trial recording zones by using recording power of a laser for recording as a parameter and reading said recorded trial data signal; detecting a difference ΔV between a center level of a densest waveform and a center level of a thinnest waveform in each of said plurality of trial zones, said densest and thinnest waveforms constituting said trial data signal reproduced by using the recording power of said recording laser as a parameter; deciding a value of said recording power of said recording laser which is obtained when a reproduced trial data signal in which the difference ΔV between said center levels is minimum is recorded in each of said plurality of trial zones and determining said value to be an optimum recording power value of said recording laser; and recording regular data at a predetermined area in the recording region on said optical recording medium by using an optimum power value of said recording laser determined in connection with a trial recording zone which is closest to said predetermined area among said plurality of trial recording zones.
Claim 10
Independent Claim
219 words
A method of controlling recording of optical records, comprising the steps of: setting a plurality of trial recording zones in a recording region on an optical recording medium; trailly recording a predetermined trial data signal on each of said plurality of trial recording zones by using recording power of a laser for recording as a parameter and reading said recorded trial data signal; detecting a difference ΔV between a center level of a densest waveform and a center level of a thinnest waveform in each of said plurality of trial zones, said densest and thinnest waveforms constituting said trial data signal reproduced by using the recording power of said recording laser as a parameter; deciding a value of said recording power of said recording laser which is obtained when a reproduced trial data signal in which the difference ΔV between said center levels is minimum is recorded in each of said plurality of trial zones and determining said value to be an optimum recording power value of said recording laser; and recording regular data at a predetermined area in the recording region on said optical recording medium by using an optimum power value of said recording laser determined in connection with a trial recording zone which is closest to said predetermined area among said plurality of trial recording zones.
Claim 11
Dependent Claim
23 words
A recording control method of an optical recording according to claim 8 wherein said recording power value is controlled by the pulse width.
Claim 12
Dependent Claim
81 words
A recording control method of an optical recording according to claim 8 wherein at least one shift amount selected from the defocus amount of a laser beam on said optical recording medium, the shift amount of a position on a track at which recording is done on said optical recording medium and the shift amount of power of said laser for recording is controlled in advance of said trial recording step such that the selected amount falls within a predetermined range.
Claim 13
Dependent Claim
145 words
A control method of data recording and reading of information, comprising the steps of: recording trial write data at a predetermined position on a recording medium while changing optical recording power; reproducing the recorded trial write data; for the purpose of recording regular information on said recording medium, irradiating a light spot of light from a light source at a predetermined area on said recording medium to record the information by forming, on said recording medium, a recording area which is physically different from an unrecorded portion, wherein said trail write data and an input data bit string indicative of the regular information are converted into code strings based on a modulation system of an apparatus for recording, a data pulse train for recording said code string on said recording medium, and said light source is driven to record the information on said recording medium.
Claim 14
Dependent Claim
145 words
A control method of data recording and reading of information, comprising the steps of: recording trial write data at a predetermined position on a recording medium while changing optical recording power; reproducing the recorded trial write data; for the purpose of recording regular information on said recording medium, irradiating a light spot of light from a light source at a predetermined area on said recording medium to record the information by forming, on said recording medium, a recording area which is physically different from an unrecorded portion, wherein said trail write data and an input data bit string indicative of the regular information are converted into code strings based on a modulation system of an apparatus for recording, a data pulse train for recording said code string on said recording medium, and said light source is driven to record the information on said recording medium.
Claim 15
Dependent Claim
103 words
An information recording and reproduction control method according to claim 11 wherein trial write data and a recording pulse train and a recording auxiliary pulse which correspond to a recording mark of an input data bit string indicative of regular information are generated, the head pulse and the second and ensuing pulses of said recording pulse train are made to be different in length, each recording pulse train is followed by a pause period at which said recording auxiliary pulse is provided, and the light source is driven such that at least two light intensity values or energy levels are produced for recording.
Claim 16
Dependent Claim
48 words
An information recording and reading control method according to claim 11 wherein a recording medium which permits overwrite of information by modulating the light intensity of said recording pulse train and said recording auxiliary pulse is used said recording medium is subjected to recording power and erase power.
Claim 17
Dependent Claim
37 words
The control method of an information recording and reading according to claim 11 wherein both or at least one of levels of the recording pulse and auxiliary pulse of a recording waveform is controlled through trial write.
Claim 18
Dependent Claim
98 words
The control method of an information recording and reading according to claim 11 wherein a highest density data pattern and a lowest density data pattern, on the use modulation code which are of the highest and lowest frequencies in the apparatus, respectively, are used in combination for a recording pattern used during the trial write processing, center levels of the highest and lowest data patterns on the using modulation code are detected from a read-out signal of the recording pattern, and regular recording is executed by using recording power which causes the center levels to equal each other.
Claim 19
Dependent Claim
59 words
The control method of information recording and reading and apparatus wherein in claim 15, the repetition period of the combination of the highest and lowest data patterns on the using modulation code representative of the recording pattern during the trial write processing is set to twice or more the period at which retardation is possessed by a disc substrate.
Claim 20
Dependent Claim
44 words
The control method of information recording and reading and the recording/reading apparatus wherein in claim 15, a track at which the trial write processing is carried out is erased upon completion of the processing by using maximum power used in the trial write processing.
Claim 21
Dependent Claim
94 words
The control method of an information recording and reading according to claim 15 wherein recording is effected by sequentially changing recording power for respective sectors during trial write recording operation, center levels of the highest and lowest data patterns on the using modulation code are detected while reproducing the sectors sequentially during a reading operation, and recording power set in a sector in which the center levels equal each other, that is, the difference therebetween becomes zero is defined as an optimum power and regular recording is carried out by using the optimum power.
Claim 22
Dependent Claim
42 words
The control method of an information recording and reading according to claim 15 wherein a peak hold circuit and a bottom hold circuit are used for detection of the center levels of the read-out signal indicative of the trial write recording pattern.
Claim 23
Dependent Claim
38 words
The control method of an information recording and reading according to claim 15 wherein a low frequency cut circuit is used for detection of the center levels of the read-out signal indicative of the trial write recording pattern.
Claim 24
Dependent Claim
84 words
A control method of data recording of magneto optical recording wherein when performing recording, reading and erasing operations by using at least a laser beam and an externally applied magnetic field, a laser beam recording pulse for each respective mark to be recorded being divided and provided in the form of intermittent and fine pulses irradiated on a recording medium to control flow of heat diffusing in said recording medium to thereby control the width and length of a magnetic domain to be formed.
Claim 25
Dependent Claim
84 words
A control method of data recording of magneto optical recording wherein when performing recording, reading and erasing operations by using at least a laser beam and an externally applied magnetic field, a laser beam recording pulse for each respective mark to be recorded being divided and provided in the form of intermittent and fine pulses irradiated on a recording medium to control flow of heat diffusing in said recording medium to thereby control the width and length of a magnetic domain to be formed.
Claim 26
Dependent Claim
31 words
A recording control method of a magneto-optical recording according to claim 21 wherein at least two or more power levels are used in a data recording region of said recording pulse.
Claim 27
Dependent Claim
55 words
A control method of recording of magneto optical recording wherein when recording, reading and erasing operations are performed by using at least a laser beam and an externally applied magnetic field, a recording pulse used for each respective recording mark is comprised of a separate pre-heat region and at least two separate data recording regions.
Claim 28
Dependent Claim
55 words
A control method of recording of magneto optical recording wherein when recording, reading and erasing operations are performed by using at least a laser beam and an externally applied magnetic field, a recording pulse used for each respective recording mark is comprised of a separate pre-heat region and at least two separate data recording regions.
Claim 29
Dependent Claim
30 words
The control method on a magneto-optical recording according to claim 23 wherein at least two or more power levels are used in said data recording region of the recording pulse.
Claim 30
Dependent Claim
103 words
The control method of a magneto-optical recording wherein when recording, reading or erasing of optical recording is performed by using at least a laser beam and an externally applied magnetic field, a recording pulse used is comprised of a separate pre-heat region and at least two separate data recording regions, a low recording level portion having a predetermined duration is provided between adjacent recording pulses, and setting values of all low recording level portions or a setting value of at least one low recording level portion is changed independently or cooperatively in accordance with a recording medium used or a use ambient condition.
Claim 31
Dependent Claim
103 words
The control method of a magneto-optical recording wherein when recording, reading or erasing of optical recording is performed by using at least a laser beam and an externally applied magnetic field, a recording pulse used is comprised of a separate pre-heat region and at least two separate data recording regions, a low recording level portion having a predetermined duration is provided between adjacent recording pulses, and setting values of all low recording level portions or a setting value of at least one low recording level portion is changed independently or cooperatively in accordance with a recording medium used or a use ambient condition.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-03-23 | 2001-09-22 | 2002-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-03-23 | 2005-09-22 | 2006-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-03-23 | 2009-09-22 | 2010-03-24 | $7700.00 | Window Closed / Lapsed |