JP3534628B2 - Optical disk drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device, and more particularly to an optical disk device characterized by a structure for properly setting recording power. 2. Description of the Related Art Write-once optical disk drives, especially CD-ROMs
Assurance of the recording quality of data recorded in an R (CD-Recordable) drive can be achieved by appropriately setting the recording power at the time of recording. An optical disk recording laser power setting device proposed in Japanese Patent Application Laid-Open No. 6-349066 discloses an optical disk in which a prepit sequence for setting the recording power of a recording laser is previously formed on an optical disk, and a reproduction signal of the prepit sequence is formed. And PCA (PowerCar
It is an object of the present invention to set an optimum recording power for the optical disk based on a comparison result with a reproduction signal of a pit string recorded in a recording area for test writing called an ibration area. [0003] Orange Book Part II is a standard document that specifies the specifications of CD-Rs.
R has 100 partitions, ie, 10 partitions, where the recording area used in one recording session is one partition.
There are 0 PCAs. One partition can be divided into 15 frames by a unit called a smaller frame. The CD-R includes an ATIP (Ab
solute Time In Pregroove)
A recommended recording power is recorded as a recording power capable of obtaining a sufficient recording quality. [0004] Data recorded on a CD-R is required to be readable in a CD-R drive as well as in a CD (Compact Disk) drive or a CD-ROM drive. Demands on the setting accuracy of the recording power for determining the recording quality are severe.
Prior to data recording, the CD-R drive performs test writing of a test pit row by allocating a total of 15 levels of recording power to each frame of one partition, seven levels above and below, based on the recommended recording power. Then, the recorded test pit row is reproduced, and data is recorded with the recording power at which the upper and lower peaks of the reproduced RF signal are balanced. A series of processes related to the setting of the recording power is called power calibration. [0005] In addition, a recordable CD-R is a CD or a CD.
In the finalizing process for completing the ROM, the recording power is set using one partition of the PCA when recording index information called TOC (Table Of Contents). Therefore, it is possible to use 99 partitions excluding one partition for finalization processing for test writing for data recording. For example, when recording one song at a time in one recording session, a maximum of 99 test songs can be written. Also, the number of songs that can be recorded on the CD-R follows this. However, if it is not possible to set the recording power that ensures sufficient recording quality in one test writing, it is necessary to perform the test writing again. Therefore, in such a case, there is a problem that the number of pieces of music that can be actually recorded is less than 99 pieces. A method of using a power calibration area of a write-once optical disc and a method of power calibration proposed in Japanese Patent Application Laid-Open No. 7-287847 are disclosed in Japanese Patent Application Laid-Open No. H07-287847. 15 frames), one partition is divided into a plurality of areas, and one test writing is performed in one of the divided areas, so that a plurality of test writings can be performed in the range of one partition. It is an object of the present invention to make it possible to create a CD according to the standard. FIG. 4 is an explanatory diagram for explaining the concept of the use of the power calibration area of the write-once optical disc and the concept of the power calibration method, and illustrates a partitioning mode of the PCA.
As shown in the figure, the method of using the power calibration area of the write-once optical disc and the method of power calibration use one partition of the PCA divided into five areas ERa to ERe. Specifically, the first
Area ERa is 5 frames, the second area ERb is 2 frames, the third area ERc is 3 frames, and the fourth area ER
d is composed of two frames, and the fifth area ERe is composed of three frames. For each of the first to fifth frames in the first area ERa, one of five types of recording powers divided into five levels within the setting range of the recording power is set to write a test pit row. Do. The written test pit string is reproduced, and the β value in each frame is obtained. The β value is a value obtained by the following equation (1) based on the maximum value A and the minimum value B of the reproduced RF signal. Β = (A + B) / (AB) (1) The recording power at which the β value becomes the best is calculated by interpolating between the obtained five β values. Next, the second region ER
A test pit row is written to the first and second frames b with the obtained recording power, and a correction value for minimizing the jitter is obtained based on the time width of the pit read during the reproduction. The time width of the recording signal is corrected based on the recording signal. Next, for the first to third frames of the third area ERc, one of the above-mentioned recording power and two kinds of recording power slightly higher than the above-mentioned recording power is set, each of a total of three kinds of recording power. To write a test pit row,
The written test pit string is reproduced, and the β value in each frame is obtained. Interpolating between the three β values found,
The recording power at which the β value becomes the best is calculated. In addition, the fourth
In the first and second frames of the area ERd, a test pit row is written with the obtained recording power, and a correction value for minimizing the jitter is obtained based on the time width of the pit read during the reproduction. Based on this, the time width of the recording signal is corrected. The first to third regions are located in the fifth region ERe.
For a frame, the recording power, ie, the third area E
The test pit row is written by setting one of the three types of recording power, that is, the recording power obtained from the Rc reproduction RF signal and the two types of recording power slightly higher than this, and the written test pit is written. The row is reproduced, the β value in each frame is obtained, and the recording power at which the β value is the best is calculated by interpolating between these three β values. [0013] Incidentally, there are Track At Once and Packet Writing as recording methods for additionally recording on a CD-R. Track At Once is a recording method in which a recording signal is newly provided and recorded each time a recording session is performed, and packet writing is performed by the Track At Once.
This is a recording method in which the restriction on the recording unit is relaxed and additional recording is performed in data units called packets lower than the track. Normally, when recording is performed by Track At Once, the number of recording sessions rarely exceeds 99. However, when comparing the case where the same amount of data is recorded by Track At Once or packet writing, the number of recording sessions is generally larger in packet writing. That is, when data is recorded by packet writing, there is a high possibility that the number of recording sessions will exceed 99. Exceeding 99 attempts will not be accepted because trial writing to record the excess is not possible. That is, in the conventional CD-R drive, even if an unrecorded area remains on the CD-R, there is a problem that the area may not be used. The present invention has been made in view of such circumstances, and has a recording area for test writing used for one recording session smaller than one partition, and a remaining recording area for the next and subsequent recording sessions. It is an object of the present invention to provide an optical disk device that can be used for trial writing so that more than 100 recording sessions can be performed on a CD-R. The optical disk device according to the present invention has a pit train.
Test area and use of test area
PCA ( Power
Calibration Area ), and the test area is determined in advance.
Is divided into multiple partitions
Each partition has a plurality of predefined frames.
When data is recorded on an optical disk that is further divided into frames, a test pit sequence is written in the test area of the optical disk, and then the recorded pit sequence is read and evaluated, and used for recording based on the evaluation. In the optical disk device that sets the recording power of the light beam to be recorded and records data, the recommended recording power prerecorded on the optical disk is set as a reference step, and the recording power of a plurality of steps is set at a wide step interval above and below the recommended recording power The set recording power is made to correspond to each of a predetermined number of consecutive unused frames from the top of a plurality of frames in one partition, one by one, and the pit train is set at each recording power by each recording power. , And then read and evaluate the pit sequence recorded in each frame,
Evaluation is selected as the reference record power the best recording power, based step the reference recording power set in a narrow step spacing the recording power of the multi-step above and below, before
Some of the frames will be part of the next calibration
1 as part of the frame used for test writing
Each of the above configured to remain in the partition
The recording power is set to a predetermined number of frames following the predetermined number of frames.
Each of the following unused frames is made to correspond to one by one, and a pit train is written in each frame with each recording power,
Thereafter, the pit train recorded in each frame is read out and evaluated, the recording power having the best evaluation is selected as the proper recording power, and the data is recorded by setting the proper recording power. And This optical disk device secures a recording area for test writing for an excess of more than 99 times by making the recording area used for test writing of one recording session smaller than one partition. FIG. 3 is an explanatory diagram for explaining an example of partitioning a PCA partition. As shown in the figure, PCA
Can be divided into two parts, a count area on the inner circumference side and a test area on the outer circumference side. The test area is a recording area for trial writing a test pit row, and the count area is a recording area for recording the use status of the test area. The test area includes P1 to P
Can be divided into 100 partitions up to 100. Also,
One partition can be divided into fifteen frames from F1 to F15, and a predetermined number of frames, for example, five frames, are used from the beginning by one trial writing. Hereinafter, a procedure of power calibration using the partition by the optical disk device will be described. First, an ATIP signal is obtained, and the recommended recording power value (P _REF ) included in the ATIP signal is used as a reference step.
A test pit row is trial-written by associating a total of five types of recording power (P1 <P2 <P3 = _PREF <P4 <P5) with each of the five frames from F5 to F5. When the test writing is completed, the test pit row of each frame is read out to calculate the β value, and the recording power (P4) having the best value is selected as the reference recording power ( _PSMP ). Next, using the reference recording power as a reference step, the recording power is distributed at relatively small step intervals, for example, at 0.1 mW intervals, two steps each above and below the reference recording power, and each of the five frames from F6 to F10. 5 in total
Types of recording power (P6 <P7 <P8 = P _SMP <P9 <
P10) is written one by one as a test pit row. When the test writing is completed, the test pit row of each frame is read out to calculate the β value, and the recording power (P7) having the best value is selected as the appropriate recording power (P _WRI ). Then, data is recorded with the selected appropriate recording power. As described above, while 15 frames are used in the conventional power calibration, 10 frames are satisfied in the present invention, and the remaining frames are used for the next power calibration. Allows more than 99 recording sessions. FIG. 1 is a block diagram showing the configuration of an optical disk device according to the present invention. Referring to FIG. 1, reference numeral 1 denotes an optical disk. A spiral groove called a pre-groove is formed on the recording surface of the optical disk 1 in advance, and the pre-groove is FM-modulated by slightly vibrating in the radial direction of the optical disk 1. ATIP signal is recorded. Reference numeral 2 denotes an optical pickup that irradiates a recording surface of the optical disc 1 with a light beam and converts reflected light from the recording surface into an electric signal, thereby reproducing a pit row formed on the optical disc 1. The optical pickup 2 converts a reproduced RF signal obtained by reproducing the pit train into a low-pass filter (LPF).
Give to 3. In addition, a reproduction tracking error (TE) signal due to minute vibration in the radial direction of the pre-groove is converted to an ATIP signal.
It is given to the decoder 4 and the servo controller 5. Furthermore, the optical pickup 2 gives a focus error signal to the servo controller 5. The LPF 3 converts the applied reproduction RF signal to DC, and supplies the DC voltage level to the A / D converter 6, and the A / D converter 6 converts the supplied DC voltage level to a digital value. To the system controller 7. This DC voltage level value is used for calculating the β value. ATI
The P decoder 4 FM-demodulates the given reproduction TE signal to obtain an ATIP signal, extracts address information and a recommended recording power value from the ATIP signal, and supplies the ATIP signal to the system controller 7. The servo controller 5 supplies a control signal to the servo mechanism 8 based on the supplied reproduction TE signal and focus error signal to control the position of the optical pickup 2 and the focus of the objective lens. The system controller 7 sets the output power of the light beam and gives the value to the D / A converter 9.
The D / A converter 9 converts the given value into an analog signal and provides the analog signal to the laser driver 10. The laser driver 10 sets the output power of the light beam emitted from the optical pickup 2 based on the given analog signal. Further, the system controller 7 supplies a timing control signal to the EFM encoder 11 to control the output timing. EF
The M encoder 11 converts the data to be recorded into an EFM signal and outputs the EFM signal based on a given timing control signal.
An FM signal is output to the laser driver 10. The laser driver 10 controls the light beam emitted from the optical pickup 2 by turning ON / OFF the voltage applied to the optical pickup 2 based on the applied EFM signal. FIG. 2 is a flowchart showing a procedure of a recording operation in the optical disk device according to the present invention. Upon receiving the recording command, the pre-groove formed on the recording surface of the optical disc 1 is reproduced, and A
An ATIP signal is acquired by the TIP decoder 4, and a recommended recording power value is extracted (S1). Using the recommended recording power as a reference step, the recording power is distributed at a relatively wide step interval by two steps above and below the recommended recording power, and test writing is performed on five consecutive unused frames in the PCA test area using a total of five types of recording power. Perform (S2). When the test writing is completed, the test pit row recorded in each frame is read out (S3), the β value is calculated, and the recording power having the best value is selected as the reference recording power (S4). Next, using the reference recording power as a reference step, the recording power is divided by two steps above and below the reference recording power at relatively small step intervals, respectively. Trial writing is performed (S5). After the trial writing, the test pit string recorded in each frame is read out (S6), and the β value is calculated,
The recording power having the best value is selected as an appropriate recording power (S7). Then, the appropriate recording power is set in the laser driver 10 via the D / A converter 9, and data is recorded (S
8). In the embodiment described in detail above, five frames are used for the first and second test writings, respectively, for a total of 10 frames.
Although the frame is used, a configuration may be used in which the reference recording power is used as a reference step in the second trial writing, and one step is used above and below the reference recording power, that is, only three frames are used, for a total of eight frames. Also, by increasing the number of trial writings by one and instead reducing the number of frames used to three to three, a total of nine frames are used in three trial writings, so that the recording power becomes more appropriate. Can be set to Furthermore, by setting the set recording power in a predetermined area of the optical disk and reading it out so as to be used as a reference step in the first trial writing, an improvement in setting accuracy can be expected. According to the optical disk apparatus of the present invention as described above, the recording area for test writing used in one recording session is made smaller than one partition, so that the optical disk is specified in the standard. Since the recording session can be performed more times than the set number of times, there is an excellent effect that the recording capacity of the optical disc can be effectively used. According to the optical disk device of the present invention, β
This eliminates the need for calculation processing such as the β value interpolation processing that has been conventionally performed for setting the recording power based on the correlation between the value and the recording power, so that the time required for power calibration can be reduced. There is.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing a configuration of an optical disk device according to the present invention. FIG. 2 is a flowchart showing a procedure of a recording operation in the optical disc device according to the present invention. FIG. 3 is an explanatory diagram for explaining an example of partitioning a PCA partition; FIG. 4 is an explanatory diagram for explaining the concept of how to use a power calibration area of a conventional write-once optical disc. [Description of Signs] 4 ATIP decoder 7 System controller 9 D / A converter 10 Laser driver 11 EFM encoder

Claims (1)

(57) [Claims] (1) A test area for trial writing a pit row and a test area
Count area to record the usage status of the test area
PCA ( Power Calibration Area )
Multiple partitions with predetermined test areas
And each partition is determined in advance.
In recording data on an optical disc further divided into a plurality of frames, a pit row is trial-written in a test area of the optical disc, and then the recorded pit row is read out. An evaluation is performed, a recording power of a light beam used for recording is set based on the evaluation, and in an optical disc apparatus for recording data, a recommended recording power pre-recorded on the optical disc is set as a reference step, and a plurality of steps above and below the recommended recording power. Is set at a wide step interval, and the set recording power is set to 1 for each of a predetermined number of consecutive unused frames from the top of a plurality of frames in one partition.
In each frame, test writing a pit row in each frame with the recording power of each frame, then read out the pit row recorded in each frame and evaluate it, and evaluate the best recording power with the reference recording power. the selected, based step the reference recording power set in a narrow step spacing the recording power of the multi-step above and below, the plurality of frame
Part of the program is trial written at the next calibration
In one partition as part of the frame used for
So that each set recording power is
A pit row is trial-written at each recording power in each frame in correspondence with each of a predetermined number of consecutive unused frames following the predetermined number of frames, and thereafter, a pit row recorded in each frame is written. An optical disc apparatus characterized by reading out and evaluating, selecting a recording power having the best evaluation as a proper recording power, and setting the proper recording power to record data.