TWI389110B - Method and apparatus for optimizing write-pulse-width parameters - Google Patents

Description

Method and device for adjusting burn pulse width parameter

The invention relates to a laser burning technology, in particular to a method and a device for adjusting a burning pulse width parameter.

The way in which the burner burns the data is to convert the common data into binary data, and then modulate it according to the 8-14 modulation (EFM, Eight to Fourteen Modulation) method, and then burn the binary data into the shore on the optical disc. (Land) and pit (Pit). EFM modulation is the conversion of the original 8-bit (1-byte) data to 14-bit according to the definition of the DVD specification. By lengthening the length of the data, the data is easier to use for laser burning and reading. The data after EFM modulation can be expressed as 3T to 11T and 14T, where T represents the length of time required to burn 1-bit data, and the shortest pit/shore length needs to be 3T and the longest is 14T. Taking a DVD at 1x speed as an example, 1T is 38.23 ns, for example, reading a DVD at 4x speed, and 1T is 9.56 ns.

Figure 1 shows a set of EFM data and a schematic representation of the tracks formed by burning them onto a disc. When the laser head reads the optical disc data, its reflection coefficient does not change on the pit or the shore, and it is read as “0”. The length of the pit and the bank determines the number of “0”. At the junction of the pit and the shore, the reflection coefficient changes, that is, the front and rear edges of the pit are read as "1".

In terms of burnable discs, it can be divided into single burning and multiple overwriting. Single-burning discs, such as CD-R and DVD-R, use laser heating to destroy the physical structure of the dye on the disc track to create pits, while the undestroyed parts are shores; multiple overwritten discs, such as DVDs -RW, DVD-RAM, which uses laser to control the temperature on the track of the optical disc to cause phase change, which in turn produces Virtual pits and shores. Due to the different burning principles, overwritten optical discs use Multi-Pulse waveforms to burn data, while single-burning optical discs are mostly burned with non-multiple pulse (Non-Multi Pulse) waveforms. .

When burning, accurate control of the length of the shore and pit has a direct impact on the correctness of the data. The main parameters include laser power, pulse width and pulse waveform control. The specification defines it as the burning parameter. Figure 2 is a schematic diagram of the correspondence between the EFM data and the burn-in pulse waveform in the non-multiple pulse mode. The programming pulse includes a front pulse (Ttop, Top Pulse), a back pulse (Tlast, Last Pulse), and a bottom pulse (Tp). When the data is burned by the pre-pulse and the post-pulse, the burning power is higher, and the burning power when the bottom pulse is used to burn the data is lower. Thus, when burning a pit, higher laser power is used at both ends of the pit, and the middle portion can be burned at a lower power because of heat transfer. In Figure 2, TOPRnP and TLASTnP are the burn-in parameters. TOPRnP is used to control the Front Edge position of the prepulse of the burn pulse of the pit of length nT, and TLASTnP is used to control the position of the Fall Edge of the post pulse of the burn pulse of the pit of length nT. 3 n 14.

Since the dye formulations of the various optical disc factories are not the same, the burn pulse adjustment parameters of various optical discs cannot be shared. At present, before the mass production of the burner, the manufacturer of the burner will manually prepare the operation of the recording pulse parameter adjustment for the optical disc on the market, and store the parameters of the recording pulse adjustment of various optical discs in the firmware of the burning machine. When the user puts in the disc, the burner can find the corresponding programming pulse adjustment parameter in the firmware by using the identification code on the disc, and then successfully burn the disc. The disadvantage of the above method is that it must A lot of manpower and time cost is wasted to adjust the programming pulse adjustment parameters, and when it is necessary to replace different optical reading heads or control wafers, all the programming pulse adjustment parameters must be re-adjusted. In addition, if the quality of the discs produced by the disc factory is inconsistent, or when a new disc is not built with the built-in pulse adjustment parameters, the quality of the burned disc will be poor, and the disc will not be successfully burned.

In view of this, it is necessary to provide a method for adjusting the programming pulse width parameter.

In addition, it is also necessary to provide an adjustment device for programming the pulse width parameter.

The method for adjusting a programming pulse width parameter comprises: a pre-pulse, a post-pulse and a bottom pulse between the pre-pulse and the post-pulse; the initial value of the first pulse width parameter, the test data and the first are stored in the optical disc drive Standard length; the method for adjusting the programming pulse width parameter comprises the steps of: converting the initial value of the first pulse width parameter into a plurality of different first pulse width parameter adjustment values, and respectively using the plurality of different first pulses The width parameter adjustment value is used to burn the test data to the optical disc; respectively, the difference between the average length of the plurality of shores in each group of test data burned on the optical disc and the first standard length is detected and calculated, and multiple differences are obtained. a linear fitting of the plurality of differences to the plurality of different first pulse width parameter adjustment values according to the formula Y=aX+b, to obtain a linear fitting parameter a And b; define Y as the difference, X is the first pulse width parameter adjustment value; calculate the optimal value of the first pulse width parameter -b/a; store the optimal value of the first pulse width parameter -b /a to use it to burn the disc.

An apparatus for adjusting a pulse width parameter, wherein the programming pulse comprises a pre-pulse, a post-pulse, and a bottom pulse between the pre-pulse and the post-pulse; and the adjusting device of the programming pulse width parameter comprises: a storage unit for storing the pulse a width parameter, a standard length, and test data information; a control unit for controlling the burning operation of the optical pickup according to the obtained pulse width parameter information; and a detecting unit for detecting the pit and the shore of the test data on the optical disk Length information; an initial parameter conversion unit for converting an initial value of a pulse width parameter stored in the storage unit into a plurality of different pulse width parameter adjustment values; and a difference calculation unit for receiving the plurality of detection units The length information of the shore, calculating the difference between the average length of the plurality of shores and the length of the standard; a linear fitting unit for adjusting the received values and the plurality of different pulse width parameter adjustment values according to the formula Y=aX+b performs a linear fitting to obtain linear fitting parameters a, b; defining Y as the difference, and X is the pulse width parameter adjustment value; The optimal parameter calculation unit is used to calculate the optimal value of the pulse width parameter -b/a.

The method and device for adjusting the burning pulse width parameter can automatically adjust the optimal burning pulse width parameter according to the characteristics of the inserted optical disc itself, so that the burning quality of the disc can be improved, and the optical disc can be damaged. The chances are greatly reduced.

Before introducing the adjustment method of the burn pulse width parameter, first explain the relevant parameter name. For convenience of explanation, T is directly used to indicate the distance that the laser moves on the optical disk in the T time.

1. Jitter: Jitter is used to quantify the concentration of burned pits or shore lengths, which is defined as the standard deviation of the number of pits or shores of all lengths between 2.5T and 3.5T. The smaller the Jitter value, the better the burning quality. Due to the physical characteristics of the disc dye and the stability of the read head to control the laser pulse, the length of the land and the pit (Pit) burned onto the disc may not be all standard, and the actual condition will exhibit a normal distribution. The situation. As shown in FIG. 3A and FIG. 3B, wherein the horizontal axis is the measured length of the land and the pit, the unit is T, and the vertical axis is the logarithm of the number of occurrences r of the length. As shown in Fig. 3, point A indicates that the total number of 3T shores is 10 ^4.2 , and point B indicates that the total number of 5T pits is 10 ^3.7 . It can be seen that the number of 3T pits and shores is the largest.

2. Eye Pattern: Due to the change in laser power burned onto the disc and the response of the disc dye to the laser temperature, the amplitude of the laser head reading each data is also The difference is that if you read all the pits and shores of different lengths, the waveforms generated will be connected. Together, a pattern of eye holes will be formed. It can be seen from the physical meaning of the eye pattern that when the burned pit/shore length is very standard, as shown in Fig. 4A, the curve will be very clear, indicating that the Jitter value is also very small; otherwise, when the burned pit/ When the shore is messy and the burning quality is also poor, as shown in FIG. 4B, the more blurred the curve, the higher the Jitter value.

3. Pulse width parameter of the burn pulse: it includes the front pulse leading edge parameter TOPRnP and the post pulse trailing edge parameter TLASTnP, 3 n 14. Each of the programming pulses includes a front pulse (Ttop, Top Pulse), a back pulse (Tlast, Last Pulse), and a bottom pulse (Tp). The pre-pulse leading edge parameter TOPRnP is used to adjust the rising edge position of the pre-pulse of the burn pulse of the pit of length nT. The post-pulse trailing edge parameter TLASTnP is used to adjust the falling edge position of the post-pulse of the burn pulse of the pit of length nT.

The pulse width parameter, the standard length, and at least one set of test data information of the burn pulse are pre-stored in the disc drive. The value of this pulse width parameter can vary depending on the hardware architecture of the different optical disc drives.

Referring to FIG. 5, a method for adjusting a burn pulse width parameter includes the following steps: Step S101, converting an initial value X _{10 of} a pulse width parameter into c different pulse width parameter adjustment values X ₁₁ , X ₁₂ ,. . . X _1c , c is a natural number greater than 1. Wherein the initial value X of the pulse width parameter ₁₀ into a plurality of different conversion method of adjusting the pulse width parameter value is an initial value X ₁₀ is increased or decreased conversion. For example, the pulse width parameter initial value X ₁₀ =0.1T is converted into five adjustment values by increasing or decreasing: -0.2T, -0.1T, 0T, 0.2T and 0.3T.

The programming pulse width parameter may be a pre-pulse leading edge parameter TOPRnP or a post-pulse trailing edge parameter TLASTnP.

Step S103, obtaining test data from the optical disc drive, and respectively using the c different pulse width parameter adjustment values X ₁₁ , X ₁₂ , . . . X _1c burns the test data to the disc.

Step S105, respectively detecting and calculating a difference between an average length of the plurality of banks in the test data burned onto the optical disc and a preset standard length, to obtain c difference values.

Wherein, when detecting the lengths of the plurality of banks in the group c test data burned on the optical disc, only the length of the shore having a certain length is detected, and the preset standard length is a standard length corresponding to the length range. For example, when the preset standard length adopts the standard length of 3T, only the length of the shore in the range of 0.5T to 3.5T is detected, and when the preset standard length adopts the standard length of 4T, only the detection length is in the range of 3.5T to 4.5T. The length of the shore, and so on.

Since the number of pits and banks having a length of 3T is the largest in actual burning, in the preferred embodiment, the preset standard length adopts a standard length of 3T, and only the detection length is in the range of 0.5T to 3.5T. The length of the shore.

Step S107, the c difference values obtained in step S105 are different from the c different pulse width parameter adjustment values X ₁₁ , X ₁₂ , . . . X _1c performs a linear fitting to obtain linear fitting parameters a ₁ and b ₁ and finds the value of the pulse width parameter -b ₁ /a ₁ when the difference is 0. -b ₁ /a ₁ represents the optimum value for this pulse width parameter.

Wherein, the above linear fitting is performed according to the formula U=a ₁ V+b ₁ , U is defined as the difference, and V is the pulse width parameter adjustment value.

In step S109, the optimum value of the pulse width parameter -b ₁ /a _{1 is} stored to be used to burn the optical disk.

The adjustment method is explained below by taking the width of the programming pulse of the 5T pit (ie, n=5) as an example, and the flowchart is as shown in FIG. 6. The tuning method of the remaining 3T, 4T and 6T to 14T pits is exactly the same as that of the 5T pit. In a preferred embodiment, it is considered that the burning pulse of the pit above 7T is particularly affected by the temperature. Therefore, in order to reduce the adjusted parameters, only the pulse width parameter of the 3T~7T pit can be adjusted, and the pulse of the pit above 7T can be adjusted. The width parameter is only required to be the same as 7T.

Set the programming frequency to 2, and the initial value of the pulse width parameter as shown in Table 1 is pre-set in the disc drive.

In the preferred embodiment, the method for adjusting the burn pulse width parameter includes the following steps: Step S202, selecting the initial value X ₃ =0T of the parameter TLAST5P in Table 1, and increasing and decreasing 5 each time the adjustment range is 0.1T. TLAST5P adjustment values: -0.1T, 0.1T, 0.2T, 0.3T, 0.4T.

Step S204, using TLAST5P=-0.1T to test a set of random EFM test data on the optical disc.

The length L of the test data burned onto the optical disc was tested to meet the following three conditions: 0.5TL 3.5T, 0.5TT _{j, P} 3.5T, (n-0.5) TT _{k, P} (n+0.5)T. Here, T _{j is} defined _{, P} is the length of the pit after the shore of length L, and T _{k is} defined _{, and P} is the length of the pit before the shore of length L. Since the preferred embodiment is described by taking the width of the programming pulse of the 5T pit (i.e., n = 5) as an example, the third condition above is 4.5 TT _{k, P} 5.5T.

Calculate the difference between the average length of all eligible shores and the standard length of 3T.

Then, the remaining four TLAST5P adjustment values (0.1T, 0.2T, 0.3T and 0.4T) were used to test the random EFM test data on the optical disc, and the average length of the qualified shore was calculated according to the above method and 3T. The difference in the standard length gives four differences. Figure 7 is a diagram showing the variation of the burn pulse using TLAST5P = 0.4T.

Step S206, according to the above steps, a combination of five sets of TLAST5P adjustment values and corresponding difference values can be obtained, and a linear fitting is performed according to the above combination and the formula W=a ₂ Z+b ₂ to obtain linear fitting parameters a ₂ and b ₂ . And when W is 0, the value of Z is -b ₂ /a ₂ , as shown in FIG. Define W as the difference obtained, Z is the adjusted value of TLAST5P, then the value -b ₂ /a ₂ represents the optimal value of TLAST5P.

In step S208, the test data is burned on the optical disc by using the optimal value -b ₂ /a ₂ of the parameter TLAST5P obtained at step S206, and it is checked whether the burning quality of the burned data meets the requirements. If yes, step S210 is performed, otherwise, the process goes to step S202, and the adjustment values of the plurality of TLAST5P are increased or decreased by different adjustment ranges to re-determine the optimal value of the trailing edge parameter of the post-pulse.

Whether the test burn quality meets the requirements can be determined by detecting the Jitter value of the burned data and the parity PI/PO (Parity Inner/Parity Outer), and the Jitter and PI/PO detection are the detections specified in the DVD specification. The project will not be repeated.

In step S210, the initial value X ₅ =0T of the TOPR 5P in Table 1 is selected, and five adjustment values are added and subtracted with each adjustment range of 0.1T: -0.1T, 0.1T, 0.2T, 0.3T, 0.4T.

Step S212, using the above five adjustment values to test random EFM test data on the optical disc.

Similarly to step S204, the difference between the average length of the bank and the standard length of 3T in the test data burned onto the optical disc is respectively detected and calculated, and five differences are obtained: 0.5TL 3.5T, 0.5TT _{J, P} 3.5T, (n-0.5) TT _{K, P} (n + 0.5) T. Where T _{J is} defined as the length of the pit before the shore of length L, and T _{K is} defined _{, and P} is the length of the pit after the shore of length L.

Figure 9 is a diagram showing the variation of the burn pulse using TOPR5P = 0.4T.

Step S214, according to step S212, a combination of five sets of TOPR5P values and corresponding differences can be obtained, and a linear fitting is performed according to the above combination and the formula w=a ₃ z+b ₃ to obtain linear fitting parameters a ₃ and b ₃ , and Find the value of z - b ₃ /a ₃ when w = 0. Define w as the difference obtained, z is the adjusted value of TOPR5P, then the value -b ₃ /a ₃ represents the optimal value of TOPR5P.

In step S216, the test data is burned on the optical disc by using the optimal value -b ₃ /a ₃ of the TOPR5P obtained in step S214 to check whether the burned quality of the burned data meets the requirements. If yes, step S218 is performed; otherwise, the process goes to step S210 to increase or decrease the plurality of TOPR5P adjustment values with different adjustment ranges to re-determine the optimal value of the pre-pulse leading edge parameter.

In step S218, the optimal value of the obtained post-pulse trailing edge parameter TLAST5P and the optimal value of the pre-pulse leading edge parameter TOPR5P are stored to be used for burning the optical disc.

The process ends.

In step S204 and step S212 of the preferred embodiment, the reason for detecting only the shore meeting the above conditions is because the width of the burning pulse corresponding to the nT pit directly affects the length of the bank before and after the pit, if If the shore before/after the nT pit can reach the standard length, its length will inevitably be standard, and since the EFM encoding, the number of pits and shores with a length of 3T is the highest in the data burned onto the disc (about For the length of 1.2T or more, please refer to FIG. 3A and FIG. 3B). Therefore, if the length of the shore before and after the nT pit is 3T can be adjusted to the standard length, the front/rear length is 4T, 5T, etc. The shore will also follow the standard length.

After step S208, the optimal value of the parameter TLAST5P may also be saved first, and the optimal value of the parameter TOPR5P may be saved again in step S218.

In other embodiments, all of the burn pulses of the pits of 3T to 14T may be adjusted, or only the pulse width parameters of the partial burn pulses may be adjusted according to specific conditions.

In another embodiment, the front pulse leading edge parameter TOPRnP may be adjusted first, and then the back pulse trailing edge parameter TLASTnT may be adjusted. The method is similar to the above, and will not be described again.

The method for adjusting the programming pulse width parameter can automatically adjust the optimal value of the programming pulse width parameter, thereby obtaining the optimal programming pulse width, which can not only improve the burning quality of the disc, but also make the burning The probability of a disc is greatly reduced.

As shown in FIG. 11, the apparatus for adjusting the pulse width parameter includes a storage unit 302, a control unit 304, a detection unit 306 and an initial parameter conversion unit 308, a difference calculation unit 310, a linear fitting unit 312, and an optimal parameter calculation. Unit 314.

The storage unit 302 stores pulse width parameters, test data information, and standard length information. The storage unit 302 includes an initial parameter storage module 322, an optimal parameter storage module 324, a test data storage module 326, and a standard length storage module 328.

The initial parameter storage module 322 stores an initial value of the pulse width parameter, and includes at least one of an initial value of the post-pulse trailing edge parameter TLASTnP and an initial value of the pre-pulse leading edge parameter TOPRnP. The optimal parameter storage module 324 is used to store the optimal value of the pulse width parameter measured from the current optical disc 100. The test data storage module 326 stores test data used in the test. The length of the standard 3T or 4T or 5T is stored in the standard length storage module 328. In other embodiments, the storage unit 302 may include only the initial parameter storage module 322 and the test data storage module 326. The parameter storage module 322 initially stores the initial value of the pulse width parameter, and determines the pulse width. The optimum value of the parameter is then replaced with the optimum of the pulse width parameter for the initial value of the pulse width parameter when the new disc is next burned.

The control unit 304 is configured to control the programming operation of the optical pickup 200 according to the pulse width parameter it receives.

The detecting unit 306 is configured to detect information of pits and shores of the test data burned on the optical disc.

The initial parameter conversion unit 308 is configured to convert the pulse width parameter initial value stored in the initial parameter storage module 322 into a plurality of different pulse width parameter adjustment values.

The difference calculating unit 310 is configured to receive length information of the plurality of shores from the detecting unit 306, calculate a difference between the average length of the plurality of shores and a standard length (for example, a standard length of 3T), and output the difference to the linear fitting unit 312. .

The linear fitting unit 312 is configured to perform linear fitting on the received plurality of difference values and the plurality of pulse width parameter adjustment values according to the formula y=a ₄ x+b ₄ to obtain linear fitting parameters a ₄ and b ₄ . The definition y is the above difference, and x is the above pulse width parameter adjustment value.

The optimum parameter calculation unit 314 is for calculating an optimum value of the pulse width parameter, which is equal to -b ₄ /a ₄ .

The above-mentioned burning pulse width parameter adjusting device 300 can automatically adjust the optimal burning pulse width parameter, so that not only the burning quality of the optical disc 100 but also the probability of smashing the optical disc 100 can be greatly reduced.

100‧‧‧DVD

200‧‧‧ optical read head

300‧‧‧Programming device for burning pulse width parameters

302‧‧‧storage unit

304‧‧‧Control unit

306‧‧‧Detection unit

308‧‧‧Initial parameter conversion unit

310‧‧‧ difference calculation unit

312‧‧‧Linear fitting unit

314‧‧‧Best parameter calculation unit

322‧‧‧Initial parameter storage module

324‧‧‧Best Parameter Storage Module

326‧‧‧Test data storage module

328‧‧‧Standard length storage module

Step S101 to S109‧‧‧ Flow of the method for adjusting the pulse width parameter

Step S202 to S218‧‧‧ Flow of the method for adjusting the pulse width parameter

Figure 1 is a schematic diagram of the programming clock and EFM data.

Figure 2 is a schematic diagram of the correspondence between the EFM data and the burn pulse waveform in the non-multiple pulse mode.

Figure 3A is a schematic diagram of the Jitter of the shore measured by the experimental measurement.

Figure 3B is a schematic diagram of the Jitter of the pit measured by the experimental measurement.

Fig. 4A is a schematic view of an eye hole pattern measured by one experiment.

Fig. 4B is a schematic view showing the eye hole pattern measured by another experiment.

FIG. 5 is a flow chart of a method for adjusting a burn pulse width parameter.

6 is a flow chart of a method for adjusting a burn pulse width parameter in a preferred embodiment.

FIG. 7 is a schematic diagram showing changes in the waveform of the burn pulse when TLASTnP is adjusted in a preferred embodiment.

Figure 8 is a graph showing the relationship between the difference W and TLASTnP in a preferred embodiment.

FIG. 9 is a schematic diagram showing changes in the waveform of the burn pulse when the TOPRnP is adjusted in a preferred embodiment.

Figure 10 is a graph showing the relationship between the difference w and the TOPRnP in a more preferred embodiment.

FIG. 11 is a structural diagram of an apparatus for adjusting a burn pulse width parameter in a preferred embodiment.

Step S101 to S109‧‧‧ Flow of the method for adjusting the pulse width parameter

Claims (10)

The method for adjusting a programming pulse width parameter comprises: a pre-pulse, a post-pulse and a bottom pulse between the pre-pulse and the post-pulse; the initial value of the first pulse width parameter, the test data and the first are stored in the optical disc drive Standard length; the improvement method is that the method for adjusting the programming pulse width parameter comprises the steps of: converting the initial value of the first pulse width parameter into a plurality of different first pulse width parameter adjustment values, and respectively using the plurality of different The first pulse width parameter adjustment value is used to burn the test data onto the optical disc; respectively, the difference between the average length of the plurality of shores in each group of test data burned onto the optical disc and the first standard length is detected and calculated, Obtaining a plurality of differences; linearly fitting the plurality of differences with the plurality of different first pulse width parameter adjustment values according to the formula Y=aX+b to obtain linear fitting parameters a and b; defining Y as The difference, X is the first pulse width parameter adjustment value; calculating an optimum value of the first pulse width parameter -b/a; storing the optimal value of the first pulse width parameter -b/a, to utilize The discs were burning. The method for adjusting a programming pulse width parameter according to the first aspect of the patent application, wherein the first pulse width parameter is a post-pulse trailing edge parameter or a pre-pulse leading edge parameter; the post-pulse trailing edge parameter is used for adjusting a length The falling edge position of the pulse after the burning pulse of the nT pit; the front pulse leading edge parameter is used to adjust the rising edge position of the pulse before the burning pulse of the pit of length nT; 3 n 14, T is a burning one bit The length of time required for the data. The adjustment of the burning pulse width parameter as described in item 2 of the patent application scope The method, wherein the first pulse width parameter is a post-pulse trailing edge parameter; wherein the detecting is performed on a length of the plurality of shores in the test data on the optical disc, the length of the plurality of shores is greater than or equal to 0.5T and less than Or equal to 3.5T; and the length of the pit after the plurality of shores is greater than or equal to 0.5T and less than or equal to 3.5T, and the length of the pits before the plurality of shores is greater than or equal to (n-0.5)T and less than or Equal to (n + 0.5) T; the first standard length is a standard length of 3T. The method for adjusting a burn pulse width parameter according to the second aspect of the patent application, wherein the first pulse width parameter is a front pulse leading edge parameter; and the detecting burns the length of the plurality of shores in the test data on the optical disc. In the step, the length of the plurality of shores is greater than or equal to 0.5T and less than or equal to 3.5T; and the length of the pits before the plurality of shores is greater than or equal to 0.5T and less than or equal to 3.5T, after the plurality of shores The length of the pit is greater than or equal to (n-0.5)T and less than or equal to (n+0.5)T; the first standard length is a standard length of 3T. The method for adjusting a burn pulse width parameter according to the first aspect of the patent application, wherein the conversion method of converting the initial value of the first pulse width parameter into a plurality of different first pulse width parameter adjustment values is The initial value of the first pulse width parameter is increased or decreased based on the initial value. The method for adjusting a burning pulse width parameter according to the first aspect of the patent application, further comprising the steps of: burning the test data onto the optical disk using the optimal value of the first pulse width parameter -b/a; detecting the burning Whether the burning quality of the test data recorded on the optical disc meets the requirements, and if so, storing the optimum value of the first pulse width parameter -b/a, to use the same to burn the optical disc, otherwise re-determining the first One pulse width The best value for the degree parameter. The method for adjusting a burning pulse width parameter according to the first aspect of the patent application, wherein in detecting the length of the plurality of shores in the test data recorded on the optical disc, the plurality of banks meet one of the following two conditions: (1), the length of the plurality of shores is greater than or equal to 0.5T, and less than or equal to 3.5T; (2), the length of the plurality of shores is greater than or equal to (m-0.5)T, and less than or equal to (m) +0.5)T; and when the condition (1) is met, the first standard length is a standard length of 3T; when the condition (2) is met, the first standard length is a standard length of m T , m is greater than 3, T The length of time required to burn a single meta-data. An apparatus for adjusting a pulse width parameter, wherein the programming pulse comprises a pre-pulse, a post-pulse, and a bottom pulse between the pre-pulse and the post-pulse; and the improvement is that the device for adjusting the burn pulse width parameter comprises: a storage unit, The utility model is characterized in that the pulse width parameter, the standard length and the test data information are stored; the control unit is configured to control the burning operation of the optical pickup according to the obtained pulse width parameter information; and the detecting unit is configured to detect the test data which is inspected on the optical disc. Length information of the pit and the shore; an initial parameter conversion unit for converting the initial value of the pulse width parameter stored in the storage unit into a plurality of different pulse width parameter adjustment values; and a difference calculation unit for receiving the Detecting a plurality of shore length information of the unit, calculating a difference between the average length of the plurality of shores and the standard length; and a linear fitting unit configured to receive the plurality of differences and the plurality of different pulse width parameters The adjustment value is linearly fitted according to the formula Y=aX+b Obtain linear fitting parameters a, b; define Y as the difference, X is the pulse width parameter adjustment value; and the optimal parameter calculation unit is used to calculate the optimal value of the pulse width parameter -b/a. The apparatus for adjusting a burn pulse width parameter according to the eighth aspect of the patent application, wherein the pulse width parameter is a post-pulse trailing edge parameter or a pre-pulse leading edge parameter; the post-pulse trailing edge parameter is used for adjusting a length of nT The falling edge position of the pulse after the burn pulse of the pit; the front pulse leading edge parameter is used to adjust the rising edge position of the pulse before the burning pulse of the pit of length nT; 3 n 14, T is the burning one bit data The length of time required. The apparatus for adjusting a burn pulse width parameter according to claim 8 , wherein the calculation unit converts the initial value of the pulse width parameter into a plurality of different pulse width parameter adjustment values by increasing or decreasing.