TWI412030B - System and method for compensating record power - Google Patents

Abstract

The invention is to provide a system and method for compensating record power, which is controlled by a control unit to implement an optimum power control. From testing powers and corresponding asymmetries via linear fitting, a testing power function is formed by a calculating unit to calculate an asymmetry detected by a detect unit and corresponding power compensation. A compensation unit adjusts the power of a laser beam by the corresponding power compensation to raise the record quality.

Description

Burning power compensation system and method

The present invention relates to a burn-in power compensation system and method, and more particularly to a system and method for compensating power to maintain burn quality in an optical drive operating at an optimum power test.

The recordable optical disc generally forms a mark of 0 and 1 by reading a laser beam emitted from the hair, irradiating the optical disc to form a concave hole or a phase deformation mark, and using a difference between the amount of light reflected between the mark and the unmarked mark. Signal, to achieve the purpose of recording data. The power of the laser beam should be such that the amount of reflected light on the disc is maintained at a certain level. If the power is too large or too small, the shape of the mark will be affected, and the amount of light reflected by the mark will be changed, resulting in a difference in the amount of reflected light between the mark and the mark. It is difficult to identify, so that it cannot be read and the burning fails.

As shown in FIG. 1, it is a prior art optical disc data structure. The optical disc 10 is divided into an inner ring to an outer ring, and is sequentially divided into a power calibration area 11, a lead-in area 12, a user data area 13 and a lead-out area (Lead-out). Area) 14 etc. Among them, the test area 11 provides an area for actually testing the power of the laser beam when burning. Since the optical discs of various brands have different sensing sensitivities to the laser beam due to differences in process, technology, coating and material composition, the optical disc manufacturer records the specified laser beam power Pi and indicates the burning in the lead-in area 12. Asymmetry of quality βi. The user profile area 13 is the area where the data is actually burned, and the lead-out area 14 provides the mark of the end of the disc.

Since each of the optical disk drive and the optical disk has different characteristics, the optical disk machine first reads the laser beam power Pi and the asymmetric parameter βi specified by the manufacturer of the lead-in area 12 before burning. The difference between the specified power Pi and the specified power Pi is up and down by 7 differences to form 15 equal test powers. Then, in the test area 11, the data is actually burned at 15 test powers, then each test power burn mark is read out, and its asymmetric parameter β is detected. The power closest to the manufacturer-specified asymmetric parameter βi is selected as the burn-in power of the optical disc to complete the Optimum Power Control (OPC).

However, the optimal power test control system selects the test power closest to the manufacturer's specified asymmetric parameter βi from the 15 test powers of the isochronous phase, and there is still a gap between the asymmetric parameter βi of the optimal burn quality and There is no guarantee that the burn marks will be of the best quality. In addition, the optimal power test control is completed in the inner circle. When the programming is performed, the asymmetry parameter β of the burning mark cannot be maintained due to the difference in the moving speed of the inner and outer rings of the optical disk, the conversion of the reading speed in the multiple range, or the change in the programming temperature, which affects the quality of the burning mark.

In order to adjust the power of the laser beam and maintain a certain asymmetry parameter β, the national patent No. I276083 "Method for Burning Optical Discs and Related Systems" patent case, in advance for different types of optical discs, CD players, rotating speed and burning Recording speed, etc., to form a database of different asymmetric parameter β difference and its corresponding power compensation amount, stored in the optical disk machine, so that when the asymmetric parameter β changes, the laser power compensation is performed corresponding to the corresponding power compensation amount. . However, the database needs to test all existing CD players and CDs, and the work done is too complicated. New brands and new types of optical discs or optical discs have been constantly appearing, and old models and optical discs cannot be applied immediately. In addition, even the same brand, type of CD player or disc, due to process, assembly, material or uniformity errors, will also cause variations in the characteristics of the individual CD players or discs, can not be used for pre-stored data, let burn The quality of the recording number cannot be maintained, or even cannot be read, resulting in failure of burning. Therefore, there is still a problem in the conventional system and method for compiling the power compensation of the optical disc player.

The object of the present invention is to provide a burning power compensation system, wherein the detecting unit monitors the asymmetric parameter β of the burning mark, and uses the linear test power function approximated by the calculating unit to obtain the power compensation amount, and the control power compensation unit adjusts the burning. The power, the asymmetric parameter β of the burnt mark is controlled within an acceptable range.

Another object of the present invention is to provide a method for compensating for burning power, which is obtained by approximating the data of the optimal power test to a linear test power function, and using the specified asymmetric parameters to obtain accurate burning power to improve programming. quality.

Still another object of the present invention is to provide a method for compensating for a burning power, which utilizes an approximate linear test power function to quickly calculate a compensating power compensation amount in response to a change in an asymmetrical parameter in the burning to maintain the burning quality.

In order to achieve the object of the foregoing invention, in the burning power compensation system of the present invention, the control unit controls the spindle motor to rotate the recordable optical disc, and controls the read head to project the laser beam to the optical disc, and reads or burns the optical disc. The mark. The data of the read or burned mark is temporarily stored in the memory unit. The calculation unit approximates the test power of the optimal power test control and the corresponding asymmetric parameter to a linear test power function, and calculates an asymmetric parameter difference detected by the detecting unit and a corresponding power compensation amount. The power of the laser beam is adjusted by the power compensation unit to control the quality of the burnt mark within an acceptable range.

The burning power compensation method of the present invention first reads the specified laser beam power for optimal power test; approximates the test value of the optimal power test to a linear test power function; reads the specified asymmetric parameter and substitutes the The test power function calculates the optimal burning power as the current burning power; performs burning data; checks the burning quality, detects the asymmetric parameters of the burned marks; calculates the asymmetric parameters of the detection and the target non- The difference of the symmetrical parameters; the power compensation amount corresponding to the asymmetric parameter difference is calculated by using the test power function; and the current laser beam power is compensated by the power compensation amount.

The test power function of the present invention is

y=a*x+b

Where a, b are coefficients

y is the laser power power of the laser

x is an asymmetrical parameter.

Using the current burning power Pn, detecting the asymmetric parameter βn and the target asymmetric parameter βt, the target burning power Pt=a*(βt-βn)+Pn is obtained to obtain the power compensation amount=Pt-Pn. After calculating the difference between the asymmetric parameter and the target asymmetric parameter, it is further checked whether the non-difference is greater than a predetermined value. If the difference is not greater than the predetermined value, the current power is maintained, and if the difference is greater than the predetermined value, the power compensation amount is performed.

The technical means and the efficacies of the present invention for achieving the above objects are as follows, and the preferred embodiments are described below with reference to the drawings.

Please refer to FIG. 2 , which is a functional block diagram of the burning power compensation system of the present invention. 2 shows that the burn-in power compensation system 20 of the present invention includes a control unit 21, a spindle motor 22, a read head 23, a memory unit 24, a detecting unit 25, a calculating unit 26, a power compensation unit 27, and the like. The control unit 21 is a microprocessor for controlling the spindle motor 22 to rotate an optical disk 30. The optical disc 30 is a recordable optical disc including a test area 31, a lead-in area 32, a user data area 33 and a lead-out area 34 from the inner ring to the outer ring. The control unit 21 further controls the reading head 23 to project the laser beam to the optical disk 30, and moves along the radial direction of the optical disk 30 to read or burn the mark of the optical disk 30. The memory unit 24 is configured to temporarily store the recorded or burned symbol data.

In addition, the detecting unit 25 is controlled by the control unit 21 to detect the asymmetric parameter β of the reading symbol. The control unit 21 controls the calculation unit 26 to calculate a linear test power function in a linear Fitting manner for the 15 test powers of the optimal power test control and the corresponding asymmetric parameters β. The calculating unit 26 can detect the difference parameter β of the burned mark according to the detecting unit 25, calculate the difference between the asymmetric parameter β and the preset target asymmetric parameter βt and the corresponding power compensation amount, and the power compensation unit 27. Compensating for the power of the laser beam projected by the read head 23 to control the quality of the burnt mark within an acceptable range.

Please refer to FIG. 2, FIG. 3 and FIG. 4 at the same time. FIG. 3 is a flow chart of optimal power test control according to the present invention, and FIG. 4 is a distribution diagram of optimal power test control test values according to the present invention. When the programming power compensation system 20 of the present invention starts to burn, as shown in FIG. 3, first, in step R1, the control unit 21 controls the read head 23 to the lead-in area 32, and reads the laser light Pi and the asymmetric specified by the manufacturer. Parameter βi. Using the laser light power Pi specified by the manufacturer, the optimal power test control is started in the test area 31 of the inner ring, and the test value is read and recorded to the memory unit 24. 15 laser light powers and their corresponding asymmetric parameters β The test values are distributed as shown in Figure 4 for the asymmetric parameter β-power coordinate plot. Proceeding to step R2, the control unit 21 takes the test value recorded by the memory unit 24 and transmits it to the calculation unit 26, and the control calculation unit 26 calculates the linear test power function in a linear Fitting manner.

y=a*x+b

Where a, b are coefficients

y is power

x is an asymmetric parameter β

A specific test power function suitable for the optical disk drive and the optical disk can be obtained.

Next at step R3, the test power function y is stored by the control unit 21 in the memory unit 24. Going again to step R4, the specified asymmetry parameter βi is read. Proceeding to step R5, the control unit 21 controls the calculation unit 26 to calculate the optimum burning power Pm by substituting the specified asymmetric power parameter βi by the test power function y=a*x+b stored in the memory unit 24. Then, proceeding to step R6, the optimal burning power Pm is passed through the power compensation unit 27, and the power of the laser beam emitted from the reading head 23 is adjusted to the optimum burning power Pm to complete the optimal power test control.

The burning power compensation method of the present invention can be approximated to a linear test power function by data of the optimal power test. A more accurate optimal burning power Pm is obtained by using the specified asymmetric parameters. The asymmetry parameter β generated by the actual burning power Pm actually burns the mark, and the power is selected from the 15 test powers of the isochronous phase, which is closer to the specified asymmetric parameter βi, and the burning quality is improved. the goal of.

Please refer to FIG. 2, FIG. 4 and FIG. 5 at the same time. FIG. 5 is a flow chart of the method for compensating the burning power of the present invention. As shown in Fig. 5, the present invention starts burning data in step S1. In step S2, the foregoing optimal power test control flow of the present invention is completed, and an approximate linear test power function is obtained and adjusted to an optimum power. Then, the process proceeds to step S3 to actually burn the data to the user data area 33. Proceeding to step S4, during the burning process, the programming unit 21 may be controlled by the control unit 21 when the memory unit 24 has insufficient burn data, the optical disc changes the rotational speed or the burning speed, or the temperature change is paused. The detecting unit 25 detects the asymmetric parameter β of the burning mark when the reading head 23 reads the burning mark. In step S5, it is checked whether the difference Δβ between the asymmetry parameter β and the preset target asymmetry parameter βt is greater than a predetermined value. If the difference Δβ is not greater than the predetermined value, indicating that the quality of the burnt mark is within an acceptable range, proceed directly to step S8 to check whether the burned material has been burned. If the burnout is not completed, return to step S3 to continue burning the data. If the burn has been completed, proceed to step S9 to end the burn-in operation. If the difference Δβ is greater than the predetermined value, indicating that the quality of the burn mark has been reduced, the process proceeds to step S6 and the test power function y=a*x+b stored in the memory unit 24 is substituted, and the control unit 21 controls the calculation unit 26, Quickly calculate the target burning power and power compensation amount. Then, proceeding to step S7, the power compensation amount is transmitted to the power compensation unit 27 to timely adjust the current laser beam power to complete the phase power compensation operation. Then proceed to step S8 to check whether the burned data has been burned? If the burnout is not completed, return to step S3 to continue burning the data. If the burn has been completed, proceed to step S9 to end the burn-in operation.

In step S6, the calculation unit 26 calculates the power compensation amount. For example, as shown in FIG. 4, when the current programming power Pn is used for burning, the corresponding asymmetric parameter βn detected by the burning symbol is read. If the βn parameter exceeds the preset target asymmetry parameter βt by a predetermined range, the burning quality has been lowered, so the asymmetric parameter βn needs to be adjusted to the preset βt parameter. Wherein the target asymmetry parameter βt can be the same as the specified asymmetry parameter βi. Assuming that the unknown power corresponding to the target asymmetric parameter βt is the target burning power Pt, the current (βn, Pn) and the adjustment target (βt, Pt) are substituted into the test power function y=a*x+b to obtain

Pt=a*(βt-βn)+Pn

Therefore, from the current burning power Pn, the asymmetric parameter βn and the preset target asymmetry parameter βt, the asymmetric parameter difference can be obtained by the test power function and the proportional relationship between the power compensation amount and the power compensation amount. The value Δβ=(βt-βn) quickly calculates the target burning power Pt and its corresponding power compensation amount ΔP=(Pt-Pn), and compensates the current laser beam power to adjust the asymmetric parameter β.

Therefore, the burning power compensation system and method of the present invention can monitor the asymmetric parameter β of the burning mark by the detecting unit, and use the linear test power function approximated by the calculating unit, in response to the change of the asymmetric parameter in the burning, The power compensation amount is quickly calculated, and the power compensation unit is controlled to adjust the burning power, and the asymmetric parameter β of the burning mark is controlled within an acceptable range to maintain the burning quality.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention, and the scope of the present invention is not limited to the preferred embodiments. All of them are within the scope of the patent application of the present invention.

20. . . Burning power compensation system

twenty one. . . control unit

twenty two. . . Spindle motor

twenty three. . . Read head

twenty four. . . Memory unit

25. . . Detection unit

26. . . Computing unit

27. . . Power compensation unit

30. . . CD

31. . . Test area

32. . . Lead-in area

33. . . User data area

34. . . Export area

1 is a structural diagram of a prior art optical disc data.

2 is a functional block diagram of a burning power compensation system of the present invention.

Figure 3 is a flow chart of the optimal power test control of the present invention.

Figure 4 is a distribution diagram of the optimum power test control test values of the present invention.

FIG. 5 is a flow chart of a method for compensating the burning power of the present invention.

20. . . Burning power compensation system

twenty one. . . control unit

twenty two. . . Spindle motor

twenty three. . . Read head

twenty four. . . Memory unit

25. . . Detection unit

26. . . Computing unit

27. . . Power compensation unit

30. . . CD

31. . . Test area

32. . . Lead-in area

33. . . User data area

34. . . Export area

Claims (9)

A burning power compensation system comprises: a control unit, which controls the spindle motor to rotate the recordable optical disc, and further controls the reading head to project the laser beam to the optical disc, and reads or burns the mark of the optical disc; Controlled by the control unit, temporarily storing the data of the read or burn mark; a detecting unit, the control unit controls the asymmetric parameter of the detecting mark; and a calculating unit controlled by the control unit to control the optimal power test The test power and its corresponding asymmetry parameter are approximated as a linear test power function. The test power function is y=a*x+b, where a and b are coefficients, y is the laser power, and x is an asymmetric parameter. The linear test power function is used to calculate the difference between the asymmetric parameter detected by the detecting unit and the preset target asymmetric parameter and the power compensation amount corresponding to the difference, that is, the current burning power Pn and the detecting asymmetric parameter β n And the target asymmetric parameter β t, obtain the target burning power Pt=a*(β t-β n)+Pn to obtain the power compensation amount=Pt-Pn; and a power compensation unit, the power compensation of the receiving calculation unit Quantity, adjust the read head Laser beam power. The burning power compensation system of claim 1, wherein the optical disk comprises a lead-in area recording designated asymmetric parameter, and the preset target asymmetric parameter is equal to the specified asymmetric parameter. The burning power compensation system according to claim 2, wherein the calculating unit substitutes the specified asymmetric parameter into the linear test power function to calculate the optimal burning power of the optimal power test control. The burning power compensation system of claim 1, wherein the memory unit stores the test power function. A burning power compensation method, the steps comprising: (1) reading a specified laser beam power for optimal power testing; (2) approximating the test value of the optimal power test to a linear test power function, the test power function is y=a*x+b, where a, b are coefficients, y is laser light power, and x is asymmetric Parameters; (3) reading the specified asymmetric parameters, substituting the test power function to calculate the optimal burning power, as the current burning power; (4) burning the data; (5) checking the burning quality, detecting The asymmetry parameter of the burned mark; (6) calculating the difference between the detected asymmetric parameter and the target asymmetric parameter; (7) calculating the power compensation amount corresponding to the asymmetric parameter difference by using the test power function, ie From the current burning power Pn, detecting the asymmetric parameter β n and the target asymmetric parameter β t , the target burning power Pt=a*(β t-β n)+Pn is obtained to obtain the power compensation amount=Pt- Pn; (8) compensates the current laser beam power with a power compensation amount; and (9) completes the power compensation operation. The method for compensating the burning power according to claim 5, wherein the test value of the optimal power test is 15 laser light powers and corresponding asymmetric parameters. The method according to claim 5, wherein the target asymmetric parameter is a preset value. The method for compensating a burning power according to claim 5, wherein the target asymmetric parameter is equal to the specified asymmetric parameter. The method for compensating the burning power according to claim 5, wherein the step (6) further comprises the following steps: (6-1) checking whether the difference of the asymmetric parameter is greater than a predetermined value? If the difference is not greater than the predetermined value, proceed to step (9). If the difference is greater than the predetermined value, proceed to step (7); wherein the step (9) completes the power compensation operation, further comprising the step of: (9-1) checking Has the burning data been completed? If the burnout is not completed, go back to step (4) to continue burning the data. If the burn has been completed, enter Enter the end of the burning job.