US5513165A — Method for controlling the farm of a magnetic dom…

Claim 1

Independent Claim 181 words

An optical recording control method comprising the steps of: recording a test pattern at a constant time interval for detecting a fluctuation of recording conditions before recording information to be recorded on a magneto-optical recording disk; detecting an ambient temperature and at least one characteristic of a magneto-optical recording disk to be used from a result provided when said recorded test pattern is reproduced; and setting a unit recording laser power used when said information to be recorded is recorded on the basis of said detected result, wherein said unit recording laser power is formed of at least four levels, i.e., a read-out level, an intermediate level, a first recording level and a second recording level, a ratio between said intermediate level and said first recording level is set in a range of from 1.50 to 1.80, a ratio between said intermediate level and said second recording level is set in a range of from 1.50 to 1.80, and a ratio between said first recording level and said second recording level is set in a range of from 1.0 to 0.90.

Claim 2

Dependent Claim 181 words

An optical recording control method comprising the steps of: recording a test pattern at a constant time interval for detecting a fluctuation of recording conditions before recording information to be recorded on a magneto-optical recording disk; detecting an ambient temperature and at least one characteristic of a magneto-optical recording disk to be used from a result provided when said recorded test pattern is reproduced; and setting a unit recording laser power used when said information to be recorded is recorded on the basis of said detected result, wherein said unit recording laser power is formed of at least four levels, i.e., a read-out level, an intermediate level, a first recording level and a second recording level, a ratio between said intermediate level and said first recording level is set in a range of from 1.50 to 1.80, a ratio between said intermediate level and said second recording level is set in a range of from 1.50 to 1.80, and a ratio between said first recording level and said second recording level is set in a range of from 1.0 to 0.90.

Claim 3

Dependent Claim 139 words

An optical recording control method comprising the steps of: recording a predetermined recording pattern on a magneto-optical recording disk by a predetermined recording pulse before recording user data on said disk; obtaining a reproduced signal based on said recording pattern thus recorded from said disk; detecting an edge shift amount of a recording mark between said reproduced signal and said recording pattern; correcting said predetermined recording pulse by changing an energy level of said predetermined recording pulse in accordance with said edge shift amount; and recording said user data by said corrected recording pulse; wherein at least a plurality of recording marks are recorded on said disk by said recording pattern, said plurality of recording marks are reproduced, and said recording pulse is corrected on the basis of a reproduced signal indicative of a length of said recording mark.

Claim 4

Dependent Claim 139 words

An optical recording control method comprising the steps of: recording a predetermined recording pattern on a magneto-optical recording disk by a predetermined recording pulse before recording user data on said disk; obtaining a reproduced signal based on said recording pattern thus recorded from said disk; detecting an edge shift amount of a recording mark between said reproduced signal and said recording pattern; correcting said predetermined recording pulse by changing an energy level of said predetermined recording pulse in accordance with said edge shift amount; and recording said user data by said corrected recording pulse; wherein at least a plurality of recording marks are recorded on said disk by said recording pattern, said plurality of recording marks are reproduced, and said recording pulse is corrected on the basis of a reproduced signal indicative of a length of said recording mark.

Claim 5

Dependent Claim 30 words

The optical recording control method according to claim 2, wherein a reference clock is formed on the basis of a reproduced signal indicative of an interval of said recording marks.

Claim 6

Dependent Claim 159 words

An optical recording control method comprising the steps of: recording a predetermined recording pattern on a magneto-optical recording disk by a predetermined recording pulse before recording user data on said disk; obtaining a reproduced signal based on said recording pattern thus recorded from said disk; detecting an edge shift amount of a recording mark between said reproduced signal and said recording pattern; correcting said predetermined recording pulse by changing an energy level of said predetermined recording pulse in accordance with said edge shift amount; and recording said user data by said corrected recording pulse; wherein a power level that constructs the energy level of said recording pulse is comprised of a fine pulse formed of at least three levels, and said three levels are a read-out level having an energy level sufficient for reproducing information, an intermediate level for previously heating a nearby-position at which information is recorded, and a recording level having a power level for recording information.

Claim 7

Dependent Claim 159 words

An optical recording control method comprising the steps of: recording a predetermined recording pattern on a magneto-optical recording disk by a predetermined recording pulse before recording user data on said disk; obtaining a reproduced signal based on said recording pattern thus recorded from said disk; detecting an edge shift amount of a recording mark between said reproduced signal and said recording pattern; correcting said predetermined recording pulse by changing an energy level of said predetermined recording pulse in accordance with said edge shift amount; and recording said user data by said corrected recording pulse; wherein a power level that constructs the energy level of said recording pulse is comprised of a fine pulse formed of at least three levels, and said three levels are a read-out level having an energy level sufficient for reproducing information, an intermediate level for previously heating a nearby-position at which information is recorded, and a recording level having a power level for recording information.

Claim 8

Dependent Claim 24 words

The optical recording control method according to claim 4, wherein said intermediate level and said recording level have a predetermined power level ratio therebetween.

Claim 9

Dependent Claim 35 words

The optical recording control method according to claim 5, wherein a correction of said recording pulse is such that said recording pulse is modulated by a level between said intermediate level and said recording level.

Claim 10

Dependent Claim 25 words

The optical recording control method according to claim 4, wherein said recording level is comprised of a first recording level and a second recording level.

Claim 11

Dependent Claim 72 words

The optical recording control method according to claim 7, wherein a ratio between said intermediate level and said first recording level falls in a range of from 1.5 to 1.8, a ratio between said intermediate level and said second recording level falls in a range of from 1.5 to 1.8, and a ratio between said first recording level and said second recording level falls in a range of from 0.9 to 1.0.

Claim 12

Dependent Claim 54 words

The optical recording control method according to claim 4, wherein at least a plurality of recording marks are recorded on said disk by said recording pattern, said plurality of recording marks are reproduced, and a reference clock is formed on the basis of a reproduced signal indicative of an interval of said recording marks.

Claim 13

Dependent Claim 147 words

An optical recording control method for recording, reproducing or erasing information onto or from a magneto-optical recording disk by using at least an externally applied magnetic field and a laser light, comprising the steps of: recording a test pattern on said magneto-optical disk; reproducing said test pattern from said magneto-optical disk; evaluating output waveforms of said reproduced test pattern; and recording data to be recorded onto said magneto-optical disk; wherein said laser light is irradiated as light pulses having different power levels of a first level for recording, a second level for pre-heating and a third level for reproducing, said step of recording data to be recorded being performed by changing said power levels while keeping a ratio of said first and second power levels at a constant value on the basis of results obtained in said step of evaluating output waveforms of said reproduced test pattern.

Claim 14

Dependent Claim 147 words

An optical recording control method for recording, reproducing or erasing information onto or from a magneto-optical recording disk by using at least an externally applied magnetic field and a laser light, comprising the steps of: recording a test pattern on said magneto-optical disk; reproducing said test pattern from said magneto-optical disk; evaluating output waveforms of said reproduced test pattern; and recording data to be recorded onto said magneto-optical disk; wherein said laser light is irradiated as light pulses having different power levels of a first level for recording, a second level for pre-heating and a third level for reproducing, said step of recording data to be recorded being performed by changing said power levels while keeping a ratio of said first and second power levels at a constant value on the basis of results obtained in said step of evaluating output waveforms of said reproduced test pattern.

Claim 15

Dependent Claim 67 words

The optical recording control method according to claim 10, wherein when a recording is carried out by using a recording laser pulse waveform, at least either a recording medium structure or a pulse width of said laser pulse is detected, and a power level of said laser beam is changed by changing a set value of a ratio between the set values of first and second levels.

Claim 16

Dependent Claim 21 words

The optical recording control method according to claim 10, wherein a recording magnetic domain recorded has a constant magnetic domain width.

Claim 17

Dependent Claim 52 words

The optical recording control method according to claim 10, wherein when a recording is carried out by using said recording laser pulse waveform, a portion of said second level is comprised of a plurality of pulse groups, and said plurality of pulses are modulated between said first level and said second levels.

Claim 18

Dependent Claim 45 words

The optical recording control method according to claim 13, wherein pulse groups immediately after said pulse groups having said second level of said plurality of pulse groups have a power lower than said first level during a constant period and again have said first level.

Claim 19

Dependent Claim 43 words

The optical recording control method according to claim 10, wherein when a recording is carried out by using a recording laser pulse waveform, a recording medium is pre-heated by said first level, and information to be recorded is recorded at said second level.

Claim 20

Dependent Claim 78 words

The optical recording control method according to claim 15, wherein when a recording is carried out by using a recording laser waveform, a portion of said second level is comprised of a plurality of pulse groups, said plurality of pulse groups select the number of succeeding pulses in response to a length of a pattern determined by information to be recorded, and a leading pulse and said succeeding pulse have different power levels and different pulse widths therebetween.

Claim 21

Dependent Claim 182 words

A recording control method for recording, reproducing or erasing information onto or from a magneto-optical recording disk by using a laser beam and an externally applied magnetic field, comprising the steps of: recording a predetermined recording pattern on said magneto-optical disk by applying a predetermined recording pulse before recording user data on said magneto-optical disk; obtaining a reproduced signal based on said recording pattern recorded from said magneto-optical disk; determining an ambient temperature and at least one characteristic of said magneto-optical disk on the basis of said reproduced signal; and recording information by using a recording pulse of said laser beam whose power level is controlled in response to the determined results of the ambient temperature and at least one characteristic of said magneto-optical disk; wherein said recording pulse is formed of at least four power levels of said laser beam, said four power levels being formed of a read-out level, an intermediate level, a first recording level and a second recording level, and a ratio between said intermediate level and a plurality of recording levels being set within a constant range.

Claim 22

Dependent Claim 182 words

A recording control method for recording, reproducing or erasing information onto or from a magneto-optical recording disk by using a laser beam and an externally applied magnetic field, comprising the steps of: recording a predetermined recording pattern on said magneto-optical disk by applying a predetermined recording pulse before recording user data on said magneto-optical disk; obtaining a reproduced signal based on said recording pattern recorded from said magneto-optical disk; determining an ambient temperature and at least one characteristic of said magneto-optical disk on the basis of said reproduced signal; and recording information by using a recording pulse of said laser beam whose power level is controlled in response to the determined results of the ambient temperature and at least one characteristic of said magneto-optical disk; wherein said recording pulse is formed of at least four power levels of said laser beam, said four power levels being formed of a read-out level, an intermediate level, a first recording level and a second recording level, and a ratio between said intermediate level and a plurality of recording levels being set within a constant range.

Claim 23

Dependent Claim 74 words

The recording control method according to claim 17, wherein a ratio between said intermediate level and said first recording level is set in a range of from 1.50 to 1.80, a ratio between said intermediate level and said second recording level is set in a range of from 1.50 to 1.80, and a ratio between said first recording level and said second recording level is set in a range of from 1.0 to 0.90.

Claim 24

Dependent Claim 96 words

The recording control method according to claim 17, wherein said recording pulse is formed of a plurality of fine pulses having a constant interval, a level of a leading pulse of said fine pulses is set to a first recording level, a level of second and succeeding fine pulses is set to a second recording level, a level of said plurality of fines pulses is set to an intermediate level, and a level of a constant period provided immediately after said recording pulse indicative of a unit information code is set to a read out level.

Claim 25

Dependent Claim 27 words

The recording control method according to claim 19, wherein a pulse width of said leading pulse is larger than widths of said second and succeeding fine pulses.

Claim 26

Dependent Claim 27 words

The recording control method according to claim 19, wherein a recording mark of a minimum shape recorded on said recording medium is formed of said leading pulse.

Claim 27

Dependent Claim 48 words

The recording control method according to claim 19, wherein a width of said fine pulse or a gap between said plurality of fine pulses is set to a time width of an integral multiple of or of an inverse of an integral multiple of a recording control clock.

Claim 28

Dependent Claim 30 words

The recording control method according to claim 22, wherein intervals of said plurality of fine pulses are equal at least in said recording pulse indicative of said unit information code.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1999-04-30	1999-10-30	2000-04-30	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2003-04-30	2003-10-30	2004-04-30	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2007-04-30	2007-10-30	2008-04-30	$7700.00	Window Closed / Lapsed

Method for controlling the farm of a magnetic domain of a magneto-optical disk using pre-write testing

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