CN1485835A

CN1485835A - Determination method of optimum recording power for optical disk recording apparatus

Info

Publication number: CN1485835A
Application number: CNA031060749A
Authority: CN
Inventors: 崔N奎; 崔昇奎
Original assignee: Shanghai LG Electronics Co Ltd
Current assignee: Shanghai LG Electronics Co Ltd
Priority date: 2002-09-29
Filing date: 2003-02-21
Publication date: 2004-03-31
Anticipated expiration: 2023-02-21
Also published as: CN1229793C

Abstract

The invention relates to an optimum record power determination method of optical disc recording device which comprises, proceeding the testing recording from the initialized record, calculating the beta value of each recording power of the testing record, calculating the beta value changed value corresponding to the change of the recording power, initializing the minimum beta value corresponding to recording power into the target beta value, and initializing the optimum recording power corresponding to the target beta value, and beginning to record.

Description

The optimal recording power determining method of optical disc recording apparatus

(1) technical field

The present invention is about the video disc recording field, especially about before opening entry, when preestablishing optimal recording power, do not preestablish target beta and recording method, utilize the relation between β and the vibration, the β variable quantity of determining corresponding record power variation power hour, determine minimum power thus, although thereby for to have same code, the recording medium difference perhaps is the method that some optical disc recording apparatus such as new recording medium set optimal recording power.

(2) background technology

CD is a kind of along with CD popularizes and begins popular recording medium, and recently, along with the appearance of high capacity DVD, its expectation value is also increasing.。

Generally speaking, CD is according to can whether writing down, be divided into read-only optical disc (CD-Read only memory), DVD read-only optical disc etc. and play special-purpose CD and only the record CD (CD-Write once ReadMemory) once and the CD that can write down repeatedly of the CD (CD-Rewritable) of erasable record, DVD random access memory etc.

Optical recorder can change the big luminous energy light beam of the recording layer physical characteristics of canned data by the irradiation of drive laser diode, thereby recorded information on CD, simultaneously, utilize the little luminous energy light beam can not change canned data recording layer physical characteristics to come from the optical disk reading breath of winning the confidence.

Such optical recorder is, on CD-R during recorded information, and for the selected recording power that is suitable for CD, must be through best power control (OPC:Optimum Power Control) process.

For this reason, do not use the zone to be provided with the test zone---power calibration area (PCA:Power Calibration Area) of selected recording power in the outermost of CD-R.

As mentioned above, optical recorder was behind the power calibration area record test data of CD in the past, detect the play signal (being high-frequency signal) that is directly proportional with the light quantity of reflection, utilization is calculated the vibration amount corresponding to the variable (β value during CD-R) of the up-down symmetry of play signal waveform and is reached minimum β value, the recording power that is directly proportional with the β value, be chosen to be optimal recording power, the data based file structure writing down is recorded on the CD.

At this moment, recording power is the factors vary such as variation according to the record sensitivity, and the record sensitivity changes according to the variation of the record sensitivity of optical disc surface, temperature, optical maser wavelength.

At this moment, by the chosen recording power of best power control program before writing down, its shortcoming is: because of the difference of the medium characteristic such as inhomogeneous of the inhomogeneous or disk thickness of the deflection degree of CD, recording medium thickness causes the variation of record sensitivity, perhaps can not set suitable optimal recording power for some new recording mediums.

(3) summary of the invention

The present invention creates in order to improve above-mentioned problem, its purpose is to provide a kind of optimal recording power determining method of optical disc recording apparatus, on recording medium, when before opening entry, carrying out best power control, target setting β value not in advance, utilize the correlationship between vibration and the β, the β variable quantity of corresponding record power variation decides minimum power, but same time-code medium characteristic is different at having, when perhaps the recording medium that record format (Write Strategy) was not set at that time when exploitation writes down, can set optimal recording power.

For reaching above-mentioned purpose, the optimal recording power determining method of optical disc recording apparatus of the present invention is to be characterized in comprising following several stages:

Phase one is to finish test record by the recording power of having set;

Subordinate phase is to obtain each recording power according to described test record and calculate the β value;

Phase III is, calculates the variable quantity of the above-mentioned β value of corresponding described recording power variable quantity, the β value of the recording power of corresponding above-mentioned β value minimum change, sets target beta value for;

The quadravalence section is, sets the optimal recording power of corresponding described target beta value, and opening entry.

Below, the figure with reference to additional explains enforcement example of the present invention:

(4) description of drawings

Fig. 1 is the process flow diagram according to the optimal recording power determining method of optical disc recording apparatus of the present invention.

Fig. 2 is the best titime function determining method according to optical disc recording apparatus of the present invention, and different recording medium is to the association diagram of the β value variable quantity that variation showed of vibration and recording power.

(5) embodiment

Fig. 1 is the process flow diagram of the optimal recording power determining method of optical disc recording apparatus of the present invention;

With reference to the optimal recording power determining method of Fig. 1 explanation according to optical disc recording apparatus of the present invention, at first, in best power control (OPC) execution area, as far as possible a plurality of medium are write down test, master record form (stage 110) is set has respectively obtained good recording characteristic.

Above-mentioned master record form is for all CDs are carried out definite record, and in having defined at any time, the bit recording impulse from 3 to 11T and undue (OVER DRIVE) amplitude that drives.

Then, press the test result scope and the stepping (stage 111) of setting recording power respectively of a plurality of recording mediums.

Such as, 1 recording power scope is 2.0 ~ 9.0mw, stepping is 0.5mw, and the scope of 2 recording power is 3.0 ~ 10.0mw, and stepping is 0.5mw, 4 recording power scope is 6.0 ~ 13.0mw, stepping is 0.5mw, and 8 recording power scope is 15.0 ~ 22.0mw, and stepping is 0.5mw, the scope of 12 recording power is 17.0 ~ 32.0mw, and stepping is 1mw.

In addition, to the recording power scope that 15-ATIP (Absolute Time In Pregroove) sets according to a plurality of medium, power from small to large carries out test record (stage 112) respectively by stepping.

To each power that above-mentioned test record is finished, calculate the β value (stage 113) of the up-down symmetry of corresponding high-frequency signal waveform.

Then, calculate the β value variable quantity of corresponding record power variation, draw β value rate of change recording power (stage 114) hour, will be set at target beta (stage 115) corresponding to the β of this recording power.

Set the optimal recording power (stage 116) of corresponding above-mentioned target beta, drive laser and opening entry (stage 117).

Fig. 2 is in the optimal recording power determining method of optical disc recording apparatus of the present invention, according to the different recording medium, is related between the variable quantity of the β value of affirmation vibration and corresponding record power variation by experiment.

With reference to Fig. 2, at first, shown in the (a) and (b) of Fig. 2, (c), (d) is the vibration chart of the corresponding practical fl value of each recording medium, with the (a) and (b) of above-mentioned Fig. 2, (c), (d) shown in (e), (f), (g), (h) of corresponding Fig. 2 be separately, press the variable quantity of the β value of each recording medium corresponding record power variation, hence one can see that, between β value and vibration correlativity arranged.

Thereby, existing best power control method, not setting recording form and the experimental target beta that obtains but no matter which kind of recording medium all is provided with the optimal recording power that makes it to possess unified goal β value, the present invention then is the target beta value that is suitable for each medium characteristic according to the different set of recording medium.

Effect according to the optimal recording power determining method of the above optical disc recording apparatus of the present invention is: for determined best power before opening entry, target setting β value not in advance, utilize the correlationship of β and vibration, variable quantity to recording power, the variable quantity decision minimal power of β, although thereby have identical code but the medium characteristic is different for those, perhaps exploitation determined not at that time that the new record media of recording power was provided with best recording power.

Certainly, those of ordinary skill in the art will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.

Claims

1. the optimal recording power determining method of an optical disc recording apparatus is characterized in that comprising following several stages:

Phase one is to carry out test record by the recording power of having set;

Subordinate phase is according to resulting each recording power of described test record, to calculate the β value;

Phase III is, the variable quantity of corresponding described recording power calculates the variable quantity of described β value, draws the recording power of corresponding minimum β value rate of change, thereby will set target beta value for corresponding to the β of described recording power;