KR20050023799A - Method for detecting a writing power in optical disc driver - Google Patents

Abstract

PURPOSE: A method for detecting a recording power of an optical disk device is provided to detect optimum powers at both low speed and high speed by performing a low-speed OPC(Optimum Power Calibration) in a test area while performing a high-speed OPC in an additional test area, and to exactly detect a recording power at each recording speed, thereby improving a recording quality. CONSTITUTION: When an optical disk is inserted(S10), a microcomputer moves an optical pickup to a test area of a preset PCA(Power Calibration Area)(S11), and detects an optimum power at low speed(S12). The microcomputer moves the optical pickup to a test area of an additional PCA(S13), and detects an optimum power at high speed(S14). The microcomputer detects a recording power from the rest recording speeds(S15). The microcomputer stores the recording power at each recording speed with the optimum powers at both high speed and low speed(S16).

Description

Method for detecting a writing power in optical disc driver

The present invention provides an optical disk apparatus for detecting an optimum power at low and high speeds through an OPC operation, and also accurately recording power at other recording speeds so that an optimal recording operation is achieved by an optimal recording power. The present invention relates to a recording power detection method.

In a typical optical disc device, test data is recorded at a low speed (typically 16X) in a test area in a PCA (Power Calibration Area) (see FIG. 1) set at the innermost circumference of the optical disc for optimal power detection. It consists of the test area and the count area, the OPC (Optimum Power Calibration) operation to detect the optimum power is performed in the test area, the count area is recorded the number of OPC execution.

When the recording of the test data is completed, the optimum power at the OPC recording speed 16X is detected from the reproduction characteristics of the recorded test data, and a multiplying ratio or multiplying the detected optimum power to each recording speed ( 20X, 24X, 32X, 40X, 48X, 52X, etc.) recording power is detected. An example is as follows.

First of all, let's take a way of multiplying a certain percentage.

20X (pw) = 16X (pw) * 1.2

24X (pw) = 16X (pw) * 1.5

32X (pw) = 16X (pw) * 2

40X (pw) = 16X (pw) * 2.5

48X (pw) = 16X (pw) * 3

52X (pw) = 16X (pw) * 3.3

Next, using the method of adding a constant rate,

20X (pw) = 16X (pw) + 5mw

24X (pw) = 16X (pw) + 10mw

32X (pw) = 16X (pw) + 15mw

40X (pw) = 16X (pw) + 20mw

48X (pw) = 16X (pw) + 25mw

52X (pw) = 16X (pw) + 30mw

In this way, when the recording power at each recording speed is detected, the requested recording operation is performed using the detected recording power.

However, in spite of the difficulty of accurately predicting the recording power as the high speed increases, conventionally, as described above, since the prediction power of the high power is predicted from the optimum power of the low speed, the optical disc of the optical disc is severely affected by the high deviation of the high power. There was a problem that the recording quality may worsen toward the outer peripheral side.

In recent years, since the recording speed of the optical disk device has been gradually increased to 52 times or more, detecting the recording power of the high speed from the optimum power at the low speed as in the prior art is desirable in view of the improvement of the recording quality. Not.

Therefore, the present invention was created to solve the above problems, and performs a high speed OPC in the test area set on the outer peripheral side of the optical disk, and a low speed OPC in the test area set on the inner peripheral side of the optical disk. And a recording power detection method of the optical disc apparatus which detects the optimum power at high speed, and accurately detects and records the recording power at each recording speed, thereby improving the recording quality over the entire optical disc. Is there.

A recording power detection method of an optical disk apparatus according to the present invention for achieving the above object, the method for performing the low-speed and high-speed OPC operation respectively in the power measurement area set on the inner peripheral side and the outer peripheral side of the optical disk mounted; Stage 1; And a second step of detecting the recording power for each recording speed by using the optimum power at the low speed and the high speed detected from performing the OPC operation.

Hereinafter, a preferred embodiment of a recording power detection method of an optical disk apparatus according to the present invention will be described with reference to the accompanying drawings.

Fig. 2 shows the configuration of an embodiment of an optical disc apparatus for implementing a recording power detection method according to the present invention, and adds an error correction code (ECC) or the like to input digital data and converts it into a recording format. A processing unit 30a; A channel bit encoder (40) for reconverting the data converted into the recording format into a bitstream; An optical driver 41 for outputting a light quantity driving signal according to the input signal; An optical pickup (20) for recording a signal on the optical disc (10) in accordance with the light quantity driving signal and for detecting a recording signal from the recording surface; An R / F unit 50 for shaping the signal detected by the optical pickup 20 and outputting it as a binary signal; A drive unit 60 for driving the optical pickup 20 and the spindle motor 11; A servo unit 61 for controlling the driving of the drive unit 60 from the tracking error signal T.E and the focusing error signal F.E of the optical pickup 20 and the rotational speed of the optical disc 10; A digital reproduction signal processor (30b) for restoring the binary signal to original data with its own clock synchronized with the binary signal; EEPROM 71 in which power variable amounts p11 to p15 (multiplication) and p21 to p25 (addition) for each recording speed are preset and stored together with the reference power at each recording speed for each disc code (disk manufacturer). ; And low-speed and high-speed OPC, respectively, in the PCA set on the inner and outer circumferential sides of the optical disc 10 to detect optimum power at low and high speeds, and accurately detect the recording power at each recording speed. And a microcomputer 70 for optimum recording operation.

FIG. 3 is a flow chart illustrating a preferred embodiment of the recording power detection method of the optical disk device according to the present invention. Hereinafter, the recording power detection method of FIG. 3 according to the present invention will be described in detail with reference to FIG. Explain.

First, in the present invention, a part of the lead-out area located on the outer circumferential side of the optical disk 10 inserted and mounted as shown in FIG. 4 is additionally set to PCA, and in the additionally set PCA, the OPC is set at high speed while the preset PCA is set. In the PCA on the inner circumference side, OPC is performed at low speed to detect optimum power at high and low speeds, and with reference to the detected optimum power and the power variable amount for each recording speed set in the EEPROM 71, The recording power at the recording speed is detected, which will be described in detail below.

As the optical disc 10 is inserted and mounted (S10), the microcomputer 70 generates an OPC recording speed set to a code and a low speed of the optical disc 10, and a high speed (the highest speed supported by the device, for example, 52X). The reference power at is detected from the EEPROM 71, respectively.

In this state, the microcomputer 70 first moves the optical pickup 20 to the test area of the PCA preset on the inner circumferential side of the optical disc 10 (S11), and then detects the low speed 16X. Test data is recorded in the test area of the PCA while the reference power is changed by a predetermined size, and when the recording in the test area is completed, the microcomputer 70 generates a low-speed ( 16X), the optimum power is detected (S12).

The microcomputer 70 moves the optical pickup 20 to the test area of the PCA, which is additionally set on the outer circumferential side of the optical disk 10 (S13), and then the reference power at the detected maximum speed 52X is obtained. The test data is recorded in the test area of the PCA while changing by a predetermined size, and when the recording in the test area is completed, the microcomputer 70 obtains the optimum power at the maximum speed 52X from the reproduction characteristics of the test recorded data. Is detected (S14).

As described above, when optimum power at low and high speeds is detected through OPC operations at different positions, the microcomputer 70 powers each recording speed set in the EEPROM 71 at the detected optimum power. By multiplying or adding the variable amount, the recording power at the remaining recording speed except for the OPC recording speed is detected (S15). An example thereof is as follows.

First, taking the example of multiplying the preset power variable amounts p11 to p15,

20X (pw) = 16X (pw) * p11

24X (pw) = 16X (pw) * p12

32X (pw) = 52X (pw) * p13

40X (pw) = 52X (pw) * p14

48X (pw) = 52X (pw) * p15

As illustrated above, the microcomputer 70 may detect the recording power at each recording speed using the optimally detected power, and in general, the recording power is proportional to the recording speed to increase the power value from 16X to 52X. Gradually increasing, based on this, the variable amount of power is p11 < p12 and p13 < p14 < p15, where p13 to p15 are set to a value smaller than one.

Next, taking the example of the method of adding the preset variable power amounts p21 to p25,

20X (pw) = 16X (pw) + p21

24X (pw) = 16X (pw) + p22

32X (pw) = 52X (pw) + p23

40X (pw) = 52X (pw) + p24

48X (pw) = 52X (pw) + p25

As illustrated above, the microcomputer 70 may detect the recording power at each recording speed using the detected optimum power, and as described above, the recording power is proportional to the recording speed, The power variable amount is p21 < p22 and p23 < p24 < p25, where p23 to p25 are set to a value smaller than zero.

Then, the microcomputer 70 stores the recording power at each recording speed with the detected optimum power at the low and high speeds (S16) to be used in a later recording operation. The recording operation is as follows.

First, the digital recording signal processor 30a generates an error correction code (ECC Block) by adding encoding and error correction parity for reliability of recording / reproducing the input coded data. The bit encoder 40 converts the digital bitstream output from the digital recording signal processing unit 30a into a pulse width modulated signal for recording on the optical disc 10 and applies it to the optical driver 41. The microcomputer 70 controls the optical driver 41 so that a recording signal is output by an optical driving current corresponding to the recording power previously detected and stored at the current recording speed.

The optical driver 41 outputs a signal for recording data at an optical driving power corresponding to the applied pulse width modulated signal, so that the optical pickup 20 stores the data on the data area of the optical disc 10. Record it.

The above-described preferred embodiments of the present invention are disclosed for purposes of illustration, and those skilled in the art can improve, change, and substitute various other embodiments within the technical spirit and scope of the present invention disclosed in the appended claims below. Or addition may be possible.

In the recording power detection method of the optical disk device according to the present invention as described above, in the test area of the PCA set on the inner circumferential side and the outer circumferential side, the low power and the high speed OPC are respectively performed to detect the optimum power, and from each recording By accurately detecting and recording the recording power at double speed, it is a very useful invention to obtain the optimum recording quality over the entire optical disc.

Fig. 1 shows a general optical disc in which PCA is set on the inner circumference side.

Fig. 2 shows the structure of an optical disc apparatus for implementing the recording power detection method according to the present invention.

3 is a flowchart showing the operation of the recording power detection method of the optical disk apparatus according to the present invention;

Figure 4 shows an optical disc in which PCA is additionally set on the outer circumference side according to the present invention.

※ Explanation of code for main part of drawing

10: optical disc 11: spindle motor

20: optical pickup 30a: digital recording signal processing unit

30b: digital reproduction signal processor 40: channel bit encoder

41: optical drive 50: R / F section

60: drive portion 61: servo portion

70: Micom 71: EEPROM

Claims (7)

A first step of performing an OPC operation at a maximum speed in a preset power measurement area of an inserted optical disc; And And a second step of detecting the recording power for each recording speed using the optimum power detected from the OPC operation. The method of claim 1, The OPC operation of the first step is performed in a test area in a power measurement area additionally set on the outer circumferential side of the optical disc. The method of claim 1, The recording power detection method of the optical disc apparatus, characterized in that the detection of the recording power for each recording speed in the second step is based on the calculation of the power variable amount for each recording speed set in advance and the detected optimum power. A first step of performing low-speed and high-speed OPC operations in a power measurement area respectively set on an inner circumferential side and an outer circumferential side of the inserted optical disc; And And a second step of detecting the recording power for each recording speed by using the optimum power at the low speed and the high speed detected from the performance of the OPC operation. The method of claim 4, wherein The first step is a recording power detection method of an optical disk apparatus, characterized in that for performing the OPC operation at the highest speed that the apparatus can support in the test region in the power measurement region additionally set on the outer peripheral side of the optical disk. The method of claim 4, wherein The recording power of each recording speed in the second step is detected by the calculation of the power variable amount for each recording speed previously stored and the optimum power at the detected low and high speeds. Detection method. The method of claim 6, The recording power for each recording speed of the second step is detected for the low power except for the low speed, the optimum power at the detected low speed, the power variable amount, and the high speed except for the high speed. The recording power detection method of an optical disc apparatus, characterized by the calculation of the optimum power at high speed and the variable amount of power.