CN1138264C - Method and apparatus for writing optical recording media - Google Patents
Method and apparatus for writing optical recording media Download PDFInfo
- Publication number
- CN1138264C CN1138264C CNB971934614A CN97193461A CN1138264C CN 1138264 C CN1138264 C CN 1138264C CN B971934614 A CNB971934614 A CN B971934614A CN 97193461 A CN97193461 A CN 97193461A CN 1138264 C CN1138264 C CN 1138264C
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- China
- Prior art keywords
- value
- derivative
- power magnitude
- parameter
- power
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- Expired - Lifetime
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-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/125—Optical beam sources therefor, e.g. laser control circuitry specially adapted for optical storage devices; Modulators, e.g. means for controlling the size or intensity of optical spots or optical traces
- G11B7/126—Circuits, methods or arrangements for laser control or stabilisation
- G11B7/1263—Power control during transducing, e.g. by monitoring
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/10—Digital recording or reproducing
- G11B20/18—Error detection or correction; Testing, e.g. of drop-outs
- G11B20/1816—Testing
- G11B20/182—Testing using test patterns
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/004—Recording, reproducing or erasing methods; Read, write or erase circuits therefor
- G11B7/0045—Recording
- G11B7/00454—Recording involving phase-change effects
Abstract
A method is described for setting an optimum write power for recording information on an optical recording medium. First a series of test patterns is written on the medium, each test pattern being written with a different write power. On reading the test patterns, the modulation of each read signal is determined. The modulations as a function of write power are curve-fitted to an analytic function. The normalised derivative of this function is determined analytically and is used to determine the value of the optimum write power for the medium.
Description
Technical field
The present invention relates to a kind of light beam of using and on optical recording media, inscribe the optical recording apparatus of information, and be specifically related to the method that a kind of the best that light beam is set is inscribed the power magnitude.
This method comprises that the first step inscribes a series of test patterns on recording medium, each pattern is inscribed with different inscription power magnitude value, second step was read pattern to form the corresponding signal that reads, and the 3rd the step read from each and to draw the value that reads parameter signal, the value that parameter is read in the match of four step line has obtained defining to be inscribed the power magnitude and reads the function that concerns between the parameter.
The invention still further relates to a device of on optical recording media, inscribing information, this device comprises the light source that sends the light beam with controlled inscription power magnitude, one inscribes the control module of a series of test patterns, each pattern has different inscription power magnitude value, one reads pattern and forms the corresponding reading unit that reads signal, read the first processor that draws the reading parameter value the signal from each, curve fitting reads the value of parameter and inscribes parameter and read second processor that concerns between the parameter to obtain having defined.
Processor can be the analog or digital type and comprises programmable processor and the processor of program curing.This processor also comprises memory devices except arithmetic element.
Background technology
According to the recording method of introductory song in United States Patent (USP) 5 185 733 as can be known.In the method, a series of test patterns are scribed on the medium, and each test pattern of back is all inscribed with the inscription quantity of power level that has increased.After reading the pattern of inscription, the curve fitting computing is with the amplitude that read signal of a quadratic polynomial match as each pattern of inscribing the power magnitude.Be selected as best power, the information of recording medium after being used for inscribed corresponding to the peaked inscription power of polynomial expression.The problem that reads the noise characteristic of signal is alleviated by curve fitting.The shortcoming of this known method is that the best power magnitude that this method is determined is not taken into full account the change of properties of pen recorder and the change of properties of recording medium.Therefore, use this best power of inscribing to make on this recording medium store information unreliable.
Summary of the invention
An object of the present invention is to provide a kind of basis inscribes power and is difficult for reliable method affected by noise from the signal sets the best that reads that is scribed at the test pattern on the medium.
According to an aspect of the present invention, provide a kind of the best that light beam is set in the optical recording apparatus of inscribing information with light beam on an optical recording media to inscribe the method for power magnitude, comprise: the first step is inscribed a series of test patterns on recording medium, each pattern is inscribed with different inscription power magnitude value, second step was read these patterns to form the corresponding signal that reads, and the 3rd the step read from each and to draw the value that reads parameter signal, the value that parameter is read in the match of four step line has obtained defining inscription power magnitude and has read the function that concerns between the parameter, it is characterized in that this method also comprises: the 5th step was determined function derivative and made derivative normalization by the factor that it be multiply by the ratio that equals to inscribe performance number and readout power value, and the 6th step was selected best inscription power magnitude according to the normalization derivative of function.
In the said method, the described best power magnitude of inscribing is selected according to the preset value of the normalization derivative of described function.
For obtaining stable curve fitting process, preferably defined with orthogonal polynomial by the function of match.Then, to be no longer dependent on be the coefficient value that other polynomial expression is determined to the value of the multinomial coefficient determined of this process.
Polynomial expression is preferably Legendre (Legendre) polynomial expression, because they are in mathematical simplicity, it only needs less computing power in curve fitting process.
Read the amplitude that read signal of parametric optimization ground, because this amplitude can be easily drawn from stop the radiation detecting system from the radiation of medium for obtaining from medium.In addition, this amplitude is to determine the gratifying parameter of tracer signal quality.
Wherein, said method can read a parameter value and utilize this value to select to inscribe the value of power magnitude from medium.
Perhaps, said method reads the described preset value of normalization derivative of described function and the value that the value of using described preset value to select to inscribe the power magnitude is inscribed the power magnitude from medium.
Wherein, described function derivative is to determine with the method for resolving.
Said method can also comprise according to described function derivative to be selected the power magnitude and subsequently this quantity of power level be multiply by a constant greater than 1 to determine the best power magnitude.
Can improve the best process of inscribing power of selecting by the value that reads a parameter value from medium and utilize this value to select to inscribe parameter.This parameter value can be the feature of the specific medium that writes down it.This parameter adapts selection course and the feature that is scanned medium.This parameter can be best initial value or the scope of inscribing the power magnitude, to reduce the scope of the power magnitude of inscribing test pattern.This parameter also can be the preset value of normalization derivative, makes it possible to select best inscription power according to the character of medium.On the contrary, do not allow this selection by the fixing preset value of this device.
Before the signal calculated value, simulating signal is preferably converted to digital signal by analog to digital converter.Can determine derivative by the difference of extracting fitting function.So, must be with the value of the significant figure representative function of larger amt, and must calculate to these a large amount of numerals, so that be not subjected to the influence of the additional noise introduced by this method of determining derivative.Preferably determine function derivative, because thisly determine to introduce any additional noise hardly with the method for resolving.So the quantity of significant figure just can reduce, this has just reduced the required computing power of second processor and the quality of permission reduction analog to digital converter.
In general, the inscription power magnitude of test pattern is selected as near the best is inscribed the expectation value of power magnitude the scope.Yet, the peak power that best inscription power magnitude often can produce near light beam.So this scope is subjected to the restriction of maximum laser power.By from functional derivative, selecting the power magnitude and subsequently this quantity of power level being multiply by one, just can avoid this problem greater than 1 constant.So this test pattern is inscribed in the power bracket of removing from maximum laser power.It is to be to remove in their power bracket of saturation value to carry out at function and derivative thereof that the attendant advantages of doing like this is to measure, and this makes that the precision of determining function and derivative thereof is higher.
Another aspect of the present invention, a kind of device that is used for the information of inscribing on optical recording media is provided, comprise the light source that sends light beam with controlled inscription power magnitude, one inscribes the control module of a series of test patterns, each pattern has different inscription power magnitude value, one reads described pattern and forms the reading unit that reads signal accordingly, one reads signal from each draws the first processor that reads parameter value, one curve fitting reads the value of parameter and inscribes the power magnitude and read second processor that concerns between the parameter to obtain having defined, it is characterized in that second processor is that computing links to each other, so that draw function derivative, come this derivative of normalization by it being multiply by the factor that equals to inscribe performance number and read the ratio of parameter value, and select to inscribe the value of power magnitude according to normalized derivative.
Preferably in said apparatus, the described parameter that reads is to read the amplitude of signal.
As shown in drawings, after describing more specifically below the preferred embodiments of the invention are carried out, purpose of the present invention, characteristic and advantage will be apparent.
Description of drawings
Fig. 1 is the sketch according to an optical recording apparatus of the present invention,
Fig. 2 shows the signal that reads from two test patterns,
Fig. 3 be that expression records, as the modulation of inscribing power function and the curve map of derivative thereof,
Fig. 4 is the planimetric map of recording medium, and
Fig. 5 is the planimetric map of the indicia patterns in the medium.
Embodiment
Fig. 1 shows according to a device and an optical recording media 1 of the present invention.Medium 1 has a transparent substrate 2 and a distribution recording layer 3 thereon.Recording layer comprises a kind of material that is fit to the information of inscribing with light beam.These recording materials can be, as magneto-optical, inversion of phases, dye-type or other any suitable material.Utilize the form of optics detectable area (claiming mark again) can record the information on the recording layer 3.This device comprises a light source 4, as the semiconductor laser instrument, is used to send a light beam 5.Utilize spectroscope 6, object lens 7 and substrate 2 with beam convergence on recording layer 3.This medium also can be air incident, and light beam need not to see through substrate and just directly is incident on the recording layer 3.Assembled by object lens 7 from the light that medium 1 reflects, after seeing through spectroscope 6, drop on the detection system 8, detection system converts this incident light to the signal of electron detector.Detector signal is imported into circuit 9.This circuit draws several signals from detector signal, the information that reads from medium 1 as representative read signal S
RLight source, spectroscope 6, object lens 7, detection system 8 and circuit 9 common formation reading units 10 '.The signal that reads from circuit 9 is handled in first processor 10 so that draw the signal that necessity of parameter and control laser power magnitude is read in representative from read signal.The signal that is drawn is fed to second processor 11, and this processor processing is a series of to be read parameter value and draw the best value of inscribing power control signal in view of the above.Inscribing power control signal links to each other with control module 12.The signal 13 that representative is about to the information on the medium 1 of writing also is fed to control module 12.The output of control module 12 links to each other with light source 4.Can write a mark on recording layer 3 with single light pulse, the best that its power is determined by processor 11 is inscribed the decision of power magnitude.Also can inscribe with a series of isometric or not isometric light pulses, its power is to inscribe the decision of power magnitude by the best.
The actual emanations power that light source 4 is sent can be used unshowned detector measurement, in the light that it is placed in the untapped light beam side wave lobe or an element reflects in the light path of light beam.The signal of this detector can directly be connected to processor 11.Perhaps, this signal can be connected to control module 12, and it can combine with the peak value that reads signal at this, is formed on the measured value of the luminous power that recording layer 3 places receive and presents subsequently to processor 11.
Before information being write on the medium 1, this device is made as optimum value by carrying out following process with its inscription power.This device is at first inscribed a series of test patterns on medium 1.Should select test pattern to provide the signal that reads of expectation.If from reading the parameter that reads that signal draws is to read the maximum modulation of signal, test pattern should comprise that length is enough to obtain read the mark of the maximum modulation of signal section.When according to so-called EFM modulation information being encoded, test pattern preferably includes long I
11Mark.Test pattern is separately with different inscription power traces.Pattern subsequently can increase inscription power gradually and inscribe under the control of processor 11.These patterns can be write on the medium Anywhere, also they can be write on the test section that provides specially on the medium.
Fig. 2 shows from what the pattern of inscribing with two different inscription power magnitudes obtained and reads signal 18,19.This pattern comprises short mark, the mark of a length and the mark of a weak point, shown in signal section 15,16,17, lays respectively at and reads signal section 18 and read in the signal section 19.Actual pattern may comprise the mark of up to a hundred similar and different length.
Processor 10 is from reading signal S
RIn draw one and read parameter, be used to find best inscription power.One possible, and to read parameter be to read lowest amplitude of the signal section of signal (in Fig. 2 with ' a ' point out) and the maximum amplitude that reads signal ' ratio of b '.The ratio of preferably reading parameter is normalized modulation, promptly reads the maximum peak-to-peak value of signal ' c ' with read the maximal value of signal ' b '.
Behind the test pattern that has read on the medium 1, processor 11 form a series of numerical value that are used for the pattern modulation to the inscription power that belongs to this pattern.Inscribe power and can from record test pattern process, inscribe the value acquisition of power control signal, or from the measurement result of luminous power, obtain.Fig. 3 schematically shows the result who reads; Intersection is the measured value of the modulation m of the function of conduct inscription power P, and these intersect to have constituted jointly modulates m to inscribing the function of power.The modulation value matched curve that processor 11 usefulness record is to obtain the analytic expression as the modulation variable of inscribing power function.In Fig. 3, be represented by dotted lines this curve.Match can utilize famous least square fitting algorithm.
Next step, processor 11 is resolved the normalization derivative of ground calculating about the inscription power of modulation ' g '.Normalization derivative g (P) equals function (dm/dP) P/m.The function g that drawn curve representation draws from the modulation m of match among Fig. 3.
Processor belongs to preset value g by extraction
0The value P of inscription power, shown in the dotted line among Fig. 3, inscribe power P in the middle of from the normalization derivative, drawing
iValue g
0Can set and be stored on the internal memory of this device by pen recorder manufacturer, perhaps be stored in to be provided with and bestly inscribe before the power or on the medium that will read and write in the setting up procedure.Next step, middle power P
iValue multiplied each other by a constant h greater than 1, thereby obtain best inscription power magnitude P
0
Preset value g
0Value and times multiplying constant h determine when the medium initialization by the manufacturer of medium or user and be stored on the medium.Value g
0Setting range be 0.2 to 5.0.This value is higher than after 5.0, and the normalization derivative loses its prediction value, because may cause and g near the asymptotic line
0Relevant P value is near inscribing power shaft.The measuring error increase of derivative is to avoid g
0Value is greater than 5.0 Another reason.If should be worth less than 0.2, the normalization derivative has a very little slope, and wherein the very little error of derivative value all will cause and g
0The bigger rate of relevant value Pi is loose.Test on the duplicate record the write medium of CD form has provided g
0Value be 0.2 to 2.0, then be 2.0 to 4.0 on more highdensity medium.Times multiplying constant h preferably is set in 1.00 to 1.35 the scope.Equal (hP
i) the best inscribe power P
0Usually be set as the contiguous value of inscription power that modulation m begins saturated place.G is being set
0In the method for optimizing of h, it is by finding to provide the inscription power from the minimum jitter that reads signal that writes on the information on this medium that the best of specific medium is inscribed power.This information is preferably random information.Next, from a series of test patterns of above-mentioned inscription, determine normalization derivative dm/dP (P/m).Select P
iValue makes corresponding g
0Value is positioned at above-mentioned scope, and normalization derivative smooth branch only within reason is steep here.Now, equal P
0/ P
iH and g
0Can be used in such all mediums and all pen recorders etc. relevant value.
The value of normalization derivative turns out to be the influence of the parameter change that is subjected to pen recorder and recording medium hardly.If best inscription power magnitude is chosen according to the normalization derivative, this selected magnitude is fit to use different pen recorders at the enterprising line item of various recording mediums reliably.Can select this magnitude corresponding to the power magnitude of the preset value of normalization derivative by employing.When not carrying out curve fitting, also can realize using the advantage of normalization derivative.In the case, can by as calculate poor between the measured value, from read parameter and the comparison of inscribing quantity of power level data, determine this derivative.Yet this step of omission curve fitting will increase the noise in the derivative value, thereby make some medium the best power of inscribing is set with derivative.
Value g
0Can be stored in the device with h, thereby the parameter value that does not rely on medium is provided.Preferably, g
0Value is stored in the medium, and the value of making depends on medium.Fig. 4 shows the optical readable that has a track 30 and gets recording medium 1.This track can be spirality and is indent or embossing shape.The zone of medium is divided into the information recording area 31 that is used for inscribing user profile and is used to store and inscribe, read and wipe information-related on the medium and is not used for the control area 32 of recording user information usually.For the medium of some type, the information in the control area is mold pressing.Control area 32 is with dotted line track 32 marks in the drawings.Information recording area 31 belongs to the type that will change its optical detection attribute when being exposed to above certain specific inscription power magnitude.g
0Value can deposit the pattern of doing the control information in the medium control area 32.When the mold pressing control area, media manufacturer should write down this value.Perhaps, the user can be when the initialization medium with this value record in medium, thereby the value of record particular disk.Also can resemble g
0Such record value h.Fig. 5 shows track 33 parts that comprise mark 34 patterns after the abundant amplification.
(m, P) curve of match can be one or more polynomial expressions, is preferably orthogonal polynomial to utilize paired value.This curve can be write as:
The normalization derivative that provides with analytical form is
Here f ' is the derivative of function about parameter P (P).P
iValue can obtain from equation
(3) g(P
i)＝g
0
According to the curve that will select match, can the value of obtaining P
iThe analytic expression form or as the numerical value result of root approximation method such as the method for false position or Newton method one by one.Under possible situation, use the advantage of analytic expression to be that it provides correct root, and successive approximation may go to the root of not expecting.If can obtain the equation (3) of analytical form, just again not need to determine normalization derivative g, but preset value g
0Can directly insert equation (3) to determine relevant value P
i
Suitable orthogonal polynomial f
iCollection is Legendre (Legendre) polynomial expression.The Legendre polynomial expression of three lowest-order is:
(4)
f
0(P)＝1
f
1(P)＝P
Because these polynomial expressions are to define on the interval of-1＜P＜+1, the inscription performance number of match should do following conversion
Now must be with the inscription power magnitude P that converts
sBe used in the formula of equation (4).The value P that obtains from equation (3)
iThe scope that must convert back P
MinAnd P
Max
When using digital processing unit, must convert the input value of m and P to digital value from the analogue value with an analog to digital converter.The figure place of digital output value can be decided to be corresponding with the noise in the measured value.If for example the noise in the parameter value is the peaked 1% of parameter, converter should be at least 8, has so just introduced additional 1/2
8=1/256 quantizing noise.
If for the reason of cost, the processor 11 that carries out aforementioned calculation is compact processor, so preferably calculates with integer data format.Therefore be worth m and P should convert integer to from real number.Times multiplying constant of this conversion should be greatly to not introducing other noise and little of not requiring too many computing power.A kind of good way be select the noise (integer representation by value is definite) that exists among the value of making m and the P slightly greater than with integer representation in the value of least significant bit (LSB).Noise in this value comprises above-mentioned quantizing noise.If it is peaked 0.5% for example to be worth noise among the m and to be m, so reasonably multiplication factor is 1000 maximal values divided by this parameter.
Except adopting a series of polynomial expressions to come to adopt single function match value m and the P.This function preferably has asymptotic line when P is big numerical value, o'clock there is a null value non-definite value P＞0, and is that the functional derivative of zero place value P is a non-definite value at function.Suitable function is
The form that can resolve provides normalized derivative.Then, equation (4) is reduced to quadratic equation, makes that need not to carry out successive approximation can draw equation root.
Tangent that other suitable function is a circular arc and hyp tangent.
(7) f(P)＝a
0arctan(a
1P-a
2)
(8) f(P)＝a
0tanh(a
1P-a
2)
The tangent value and the hyp tangent value of circular arc can be stored in the key to accelerate calculating.
Claims (12)
1. inscribe on an optical recording media in the optical recording apparatus of information with light beam a kind of, a kind of the best that light beam is set is inscribed the method for power magnitude, comprising:
The first step is inscribed a series of test patterns on recording medium, each pattern is inscribed with different inscription power magnitude value,
Second step was read these patterns forming the corresponding signal that reads, and
The 3rd step read from each and draws the value that reads parameter signal,
The value that parameter is read in the match of four step line has obtained defining inscription power magnitude and has read the function that concerns between the parameter,
It is characterized in that this method comprises
The 5th step determined function derivative and made derivative normalization by the factor that it be multiply by the ratio that equals to inscribe performance number and readout power value, and
The 6th step was selected best inscription power magnitude according to the normalization derivative of function.
2. according to the process of claim 1 wherein that the described best power magnitude of inscribing selects according to the preset value of the normalization derivative of described function.
3. according to the method for claim 1 or 2, wherein this function defines with orthogonal polynomial.
4. according to the method for claim 3, wherein this polynomial expression is Legendre (Legendre) polynomial expression.
5. according to the method for claim 1 or 2, wherein reading parameter is to read the amplitude of signal.
6. from medium, read a parameter value and utilize this value to select to inscribe the value of power magnitude according to the process of claim 1 wherein that the 6th step comprised.
7. according to the method for claim 2, wherein said the 6th step comprises the described preset value of the normalization derivative that reads described function from medium and uses described preset value to select the value of inscription power magnitude to inscribe the value of power magnitude.
8. according to the process of claim 1 wherein that described function derivative is to determine with the method for resolving.
9. select a power magnitude and determine the best power magnitude by this quantity of power level being multiply by a constant subsequently according to the normalization derivative of described function according to the process of claim 1 wherein greater than 1.
10. according to the method for claim 2, wherein the 5th step comprised that also subsequently this quantity of power level being multiply by a constant greater than 1 determined the best power magnitude according to described function derivative selection power magnitude.
11. device that is used for the information of on optical recording media, inscribing, comprise the light source that sends light beam with controlled inscription power magnitude, one inscribes the control module of a series of test patterns, each pattern has different inscription power magnitude value, one reads described pattern and forms the reading unit that reads signal accordingly, one reads signal from each draws the first processor that reads parameter value, one curve fitting reads the value of parameter and inscribes the power magnitude and read second processor that concerns between the parameter to obtain having defined, it is characterized in that second processor is that computing links to each other, so that draw function derivative, come this derivative of normalization by it being multiply by the factor that equals to inscribe performance number and read the ratio of parameter value, and select to inscribe the value of power magnitude according to normalized derivative.
12. according to the device of claim 11, the wherein said parameter that reads is to read the amplitude of signal.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP96203397.3 | 1996-12-06 | ||
| EP96203397 | 1996-12-06 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1214790A CN1214790A (en) | 1999-04-21 |
| CN1138264C true CN1138264C (en) | 2004-02-11 |
Family
ID=8224647
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB971934614A Expired - Lifetime CN1138264C (en) | 1996-12-06 | 1997-12-01 | Method and apparatus for writing optical recording media |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0880778A1 (en) |
| JP (1) | JP3956153B2 (en) |
| KR (1) | KR100516813B1 (en) |
| CN (1) | CN1138264C (en) |
| ID (1) | ID23689A (en) |
| IL (1) | IL125635A (en) |
| MY (1) | MY125549A (en) |
| TW (1) | TW358935B (en) |
| ZA (1) | ZA9710932B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001307326A (en) | 2000-04-20 | 2001-11-02 | Teac Corp | Optical disk recorder |
| HU230704B1 (en) * | 2000-11-17 | 2017-10-30 | Koninklijke Philips Electronics N.V. | Methods, optical recording apparatus using such methods and optical recording medium for use by the methods and the apparatus |
| JP3801000B2 (en) * | 2001-08-27 | 2006-07-26 | ティアック株式会社 | Optical disk device |
| JPWO2005034109A1 (en) * | 2003-10-03 | 2006-12-14 | パイオニア株式会社 | Information recording medium, information recording apparatus and method, information recording / reproducing apparatus and method, and computer program |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3124720B2 (en) * | 1995-04-14 | 2001-01-15 | 株式会社リコー | Information recording / reproducing method, information recording / reproducing device, and information recording medium |
| US5268893A (en) * | 1991-10-18 | 1993-12-07 | International Business Machines Corporation | Write power calibration utilizing least squares fit of read-back signals for moving media memory |
-
1997
- 1997-02-24 TW TW086102195A patent/TW358935B/en not_active IP Right Cessation
- 1997-12-01 EP EP97912403A patent/EP0880778A1/en not_active Withdrawn
- 1997-12-01 CN CNB971934614A patent/CN1138264C/en not_active Expired - Lifetime
- 1997-12-01 KR KR10-1998-0706046A patent/KR100516813B1/en active IP Right Grant
- 1997-12-01 JP JP52540498A patent/JP3956153B2/en not_active Expired - Lifetime
- 1997-12-01 IL IL12563597A patent/IL125635A/en not_active IP Right Cessation
- 1997-12-01 ID IDW980059D patent/ID23689A/en unknown
- 1997-12-04 MY MYPI97005831A patent/MY125549A/en unknown
- 1997-12-04 ZA ZA9710932A patent/ZA9710932B/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IL125635A (en) | 2001-08-26 |
| ID23689A (en) | 2000-05-11 |
| JP3956153B2 (en) | 2007-08-08 |
| KR100516813B1 (en) | 2005-11-29 |
| CN1214790A (en) | 1999-04-21 |
| EP0880778A1 (en) | 1998-12-02 |
| ZA9710932B (en) | 1999-06-04 |
| JP2000504467A (en) | 2000-04-11 |
| MY125549A (en) | 2006-08-30 |
| TW358935B (en) | 1999-05-21 |
| IL125635A0 (en) | 1999-04-11 |
| KR19990082316A (en) | 1999-11-25 |
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