JP4091523B2 - Optical disc apparatus and optical disc recording method - Google Patents

Description

  The present invention relates to an optical disc apparatus for recording information on an optical disc and a recording method for the optical disc.

  Conventionally, for example, a CAV (CAV: Constant Angular Velocity) system, a PCAV (PCAV: Partial Constant Angular Velocity) system, and a Z-CLV (Z-CLV: Zone Constant Linear Velocity) system (for example, Patent Document 1) are used. In the case of recording information by a method in which the recording speed is increased from the inner periphery to the outer periphery of the optical disk as in the case of the optical recording apparatus, the optical recording device has recording modes such as 52 ×, 48 ×, 32 ×, and 24 ×. It is held. Here, the PCAV format is a format in which a CAV (CAV: Constant Angular Velocity) format and a CLV (CLV: Constant Liner Velocity) format are mixed in the recording area of a CD-R disc.

  For example, as shown in FIG. 4, the PCAV recording profile changes linearly from the inner periphery to the outer periphery of the CD-R disc, and reaches the maximum recording speed unique to the optical disc to be used. Thereafter, the linear velocity is constant.

  Specifically, when a recordable / reproducible CD-R disc is inserted into the apparatus, the optical disc apparatus reads disc information pre-recorded in the CD-R disc, and the optimum recording maximum for this CD-R disc is read. Set the speed. The maximum recording speed is recorded in the ROM area of the CPU in the optical disc apparatus depending on the type of the optical disc. Further, as shown in FIG. 3, for example, a recording power table from 16 × speed to a maximum of 52 × speed is registered for each n × speed in the optical disc recording apparatus, and a standard corresponding to each recording speed is recorded. The ideal recording power is registered.

  Considering the recording operation when the maximum recording speed of the optical disc is 52 ×, conventionally, in order to determine the optimum recording power for the optical disc to be recorded before shifting to the actual recording operation, first, the optical disc So-called trial writing is performed in an OPC (OPC: Optimum Power Control) area provided in advance on the inner circumference of the disk to determine the optimum recording power corresponding to the execution recording speed in the OPC area.

Next, assuming that the effective recording speed in the OPC area is, for example, 16 × speed, the ratio between the recording power at 16 × speed recorded in the recording power table described above and the optimum recording power obtained by OPC is calculated. Based on this result, the recording power in the recording power table is changed. At this time, referring to the recording power corresponding to the maximum recording speed of 52 × speed, the recording power at the time of 52 × recording approximated from the changed recording power is the variation in the characteristics of the optical disc and the components in the optical disc recording apparatus. It is determined whether or not an upper limit value of recording power determined by variation, environmental temperature change during recording operation, or the like is exceeded. As a result of the determination, if the recording power at the time of 52 × recording approximated from the changed recording power exceeds the upper limit value of the recording power, the maximum recording speed of the optical disk is lowered to protect the laser diode in the optical pickup. I was letting.
JP 2003-123255 A (page 2-7)

  However, in order to protect the laser diode from destruction, etc., it is important to reduce the maximum recording speed of the optical disc in order to maintain the quality of the entire apparatus. Furthermore, since the maximum recording speed could only be changed within a preset recording mode (for example, 52 ×, 48 ×, 40 ×, 32 ×, 24 ×, etc.), the recording mode should be lowered by one step. Therefore, there is a problem that the time required for the recording operation becomes long. Incidentally, when information of 74 minutes is recorded at 52 times speed and 48 times speed on the same optical disc, there is data that the time difference required for the recording operation is about 7 seconds.

  Accordingly, the present invention has been made in view of the above-described problems, and an optical disc apparatus that records information at a maximum allowable recording speed and a recording method in which the recording speed increases from the inner periphery to the outer periphery of the optical disc, and An object of the present invention is to provide an optical disk recording method.

The present invention proposes the following means in order to solve the above-described problems.
The invention according to claim 1 is an optical disc apparatus for recording information on an optical disc, the data table storing the recording speed and the recording power in association with each other, and the recording speed reading for reading the maximum recording speed recorded in advance on the optical disc. A recording power detecting means for recording information at the recording speed in the test writing area and detecting an optimum recording power; and a recording power corresponding to the recording speed read by the recording speed reading means is selected from the data table. And a recording speed calculating means for calculating an optimum maximum recording speed for the optical disc based on the recording power selected by the recording power selecting means and the recording power detected by the recording power detecting means. Has been proposed.

  According to a fourth aspect of the present invention, there is provided a step of reading a maximum recording speed recorded in advance on an optical disc, a step of recording information at the recording speed in a test writing area and detecting an optimum recording power, and the read recording speed. And selecting the recording power corresponding to the recording speed from the data table for storing the recording power and the recording power in association with each other, and based on the selected recording power and the detected recording power, the highest recording optimum for the optical disc And an optical disc method having a step of calculating a speed.

  According to these inventions, by operating the recording power detection means, information is recorded at a predetermined recording speed in the test writing area, the optimum recording power is detected, and the recording corresponding to the maximum recording speed of the optical disc to be recorded Based on the power and the recording power detected by the recording power detection means, the optimum maximum recording speed for the optical disk to be recorded is calculated, so that the performance relating to the optimum recording speed corresponding to each optical disk can be provided.

According to a second aspect of the present invention, there is proposed an optical disc apparatus characterized in that the recording speed calculated by the recording speed calculating means is a variable double speed.
The invention according to claim 5 proposes an optical disk recording method characterized in that the calculated recording speed is variable double speed in the optical disk recording method according to claim 4.

  According to these inventions, since the calculated recording speed is not a standardized double speed but a variable double speed, it is possible to provide performance related to an optimum recording speed corresponding to each optical disc.

According to a third aspect of the present invention, there is proposed an optical disc apparatus characterized in that the resolution of the variable double speed is not more than a single speed in the optical disk apparatus of the second aspect.
According to a sixth aspect of the present invention, there is proposed an optical disc recording method according to the fifth aspect, wherein the resolution of the variable double speed is equal to or less than a single speed.

  According to these inventions, since the resolution of the variable double speed is equal to or less than the single speed, it is possible to provide performance relating to the optimum recording speed corresponding to each optical disc.

  According to the present invention, when recording information on the optical disc at the maximum recording speed due to variations in characteristics of the optical disc to be recorded, variations in characteristics of components in the optical disc recording apparatus, environmental temperature changes during recording operation, etc. Even when the value becomes equal to or greater than a predetermined upper limit value, it is possible to provide a recording speed closer to the maximum recording speed that is normally set, so that the performance can be improved with respect to the recording speed.

  Hereinafter, an optical disk recording apparatus according to an embodiment of the present invention will be described in detail with reference to FIGS.

  As shown in FIG. 1, an optical disc apparatus according to an embodiment of the present invention includes an optical disc 1, a spindle motor 2, an optical pickup 3, a feed motor 4, a signal processing IC 5, and a CPU (CPU: Central Processing Unit). 6, a driver IC 7, an endic IC 8, and a storage unit 9.

The optical disc 1 is a recording medium on which information can be recorded, reproduced, and erased by a semiconductor laser, and examples thereof include a CD-R, a CD-RW, a DVD-R, and a DVD-RW.
The spindle motor 2 is a driving device for rotating the optical disk 1 at a constant linear velocity or a constant rotation speed, and is controlled by the output of the driver IC 7.
The optical pickup 3 includes a laser light source of the laser diode 4, an objective lens driven by a collimator lens, a focus actuator, or a tracking actuator, an optical component such as a polarization beam splitter, a cylindrical lens, and A, B, C, and the like described later. A four-divided or two-divided photodetector (PD) that converts light into electrical signals, a front-light photodiode that monitors laser output during recording and reproduction, and the like are provided.

The feed motor 4 is a mechanism for sending the pickup from the inner periphery to the outer periphery of the optical disc. During recording and reproduction of the optical disc, the feed motor 4 is activated when the offset value in the track direction of the objective lens in the pickup exceeds a predetermined value. In addition, in the track search operation, a DC voltage is supplied for high-speed search.
The signal processing IC 5 generates an RF signal indicating the total amount of reflected light to each area of the four-divided photo detector, and astigmatizes a focus error signal (FE) that is a signal that detects the defocus of the irradiation laser of the optical pickup 3. A tracking error signal (TE), which is generated by the aberration method, and is a signal obtained by detecting the track deviation of the irradiation laser of the pickup 3 is generated by the push-pull method. Further, based on the generated FE and TE, a focus drive signal (FODRV) and a tracking drive signal (TRDRV) are generated. Further, the jitter value is measured based on the generated RF signal, or the β value indicating the asymmetry of the RF signal with respect to the reference voltage is measured.

  The CPU 6 controls the entire apparatus based on a control program stored in a ROM (ROM: Read Only Memory) or the like. In the present invention, the optimum recording power obtained by the OPC operation is compared with the recording power in the data table that defines the relationship between the recording speed and the recording power stored in the storage unit 10, and the highest recording of the optical disc to be recorded is performed. The speed is calculated, and the frequency division ratio or multiplication ratio corresponding to the maximum recording speed is set in a predetermined register. Further, the recording quality is judged by comparing the jitter value or β value output from the signal processing IC 5 with a threshold value.

  The driver IC 7 receives the focus drive signal (FODRV), the tracking drive signal (TRDRV), or the spindle control signal generated in the signal processing IC 5 and amplifies them to a desired size. Alternatively, it is supplied to a spindle motor or the like. Further, the feed motor drive signal generated from the tracking drive signal (TRDRV) is amplified to a desired magnitude and then supplied to the feed motor.

For example, the endic IC 8 modulates information to be recorded on an optical disk input from a PC (PC: Personal Computer) and supplies the modulated information to a recording waveform generation unit (not shown), and demodulates information read from the optical disk and outputs it to the PC. To do. Also, the spindle control signal is generated by comparing the speed / phase information extracted from the RF signal with the reference clock signal. Further, a reference clock signal corresponding to the recording speed is generated based on a control signal from the CPU 6. Further, in this embodiment, the maximum recording speed corresponding to each optical disc is set by operating the frequency divider and multiplier based on the control signal from the CPU 6.
The storage unit 9 is configured by a rewritable storage device such as an EEPROM, and stores a data table that defines the relationship between the recording speed and the recording power.

  The spindle control signal generator in the endic IC 8 generates a clock signal used when recording information at a standardized double speed, and a clock used when recording information at the maximum recording speed at a variable double speed. 2 includes a part for generating a signal and a part for generating a spindle control signal based on these clock signals and a clock signal extracted from the reproduction signal of the optical disc. As shown in FIG. PLL (PLL: Phase Locked Loop) 11, Xtal (crystal) 12, frequency divider 13, frequency divider setting register 14, switch switching register 15, multiplier 16, and multiplier setting register 17 A switch 18 and an adder 19.

The speed / phase information generation unit 10 extracts a synchronization signal from an RF signal obtained by reproducing the optical disk 1 and generates speed / phase information related to the rotation of the optical disk 1 based on the extracted signal. The generated speed / phase information is input to the PLL 11.
The Xtal (crystal) 12 supplies a reference signal for controlling the rotation of the optical disc 1. This reference signal is also used as a reference signal for circuit operation in the optical disk recording apparatus.

The frequency divider 13 divides the reference signal supplied from the Xtal (crystal) 12 based on the value in the frequency divider setting register 14.
The frequency divider setting register 14 stores a predetermined frequency division value output from the CPU 6 corresponding to the recording speed stored in the data table stored in the storage unit 9.
The switch switching register 15 is a signal for switching between a reference signal output from the frequency divider 13 corresponding to a preset recording speed and a reference signal output from the multiplier 16 corresponding to the maximum recording power. Is stored.

  The multiplier 16 multiplies the output from the frequency divider 13 and generates a reference signal corresponding to the maximum value of the recording power. The multiplier setting register 17 stores a multiplied value for generating a reference signal corresponding to the maximum value of the recording power. The switch 18 switches between the output reference signal from the multiplier 16 and the output reference signal from the frequency divider 13. The adder 19 calculates a difference between the signal from the PLL 11 and the signal from the switch 18 to generate a spindle control signal.

Next, a method for calculating the optimum maximum recording speed for each optical disc will be described with reference to FIG. However, in the description, it is assumed that the maximum recording speed of the optical disc 1 used for information recording is 52 times speed and the upper limit value of recording power is 75 mW.
When the recording operation is started, the CPU 6 performs a setup operation and searches for the optical pickup 3 in the inner peripheral OPC area of the optical disc 1 to perform the OPC operation (step 101). In the OPC operation, trial writing is performed in the OPC area at a predetermined recording speed (for example, 16 × speed) and recording power. The test-written information is reproduced, the recording quality is evaluated based on the jitter value, β value, etc., and the optimum recording power is calculated based on this evaluation (step 102).

  Next, the optimum recording power corresponding to the recording speed in the OPC area is compared with the value in the data table that defines the relationship between the recording speed and the recording power stored in the storage unit 9, and the ratio is obtained. The obtained ratio is multiplied by the recording power corresponding to the highest recording speed in the data table, and the recording power corresponding to the highest recording speed of the optical disk to be used is obtained (step 103).

  Specifically, for example, if the optimum recording power during the OPC operation is 25.2 mW, the recording power at 52 × speed is 69.6 mW from the data table of FIG. Since this value is lower than the upper limit (75 mW) of the recording power, in this case, there is no problem even if the 52 × speed is set as the maximum recording speed. However, when the optimum recording power during the OPC operation is 27.16 mW or more, the recording power at the 52 × speed exceeds the upper limit (75 mW) of the recording power, so the 52 × recording is not permitted.

  That is, when the optimum recording power in OPC is 27.6 mW, the recording power at 52 times speed obtained from the ratio of the recording power of 16 times speed (25.2 mW) in the data table of FIG. 6 is 76.23 mW. . Therefore, conventionally, a specified multiple speed value not exceeding the upper limit (75 mW) of the recording power is applied, so the maximum recording speed of this optical disc is 48 times speed.

  However, in the present invention, the optimum recording power corresponding to the recording speed in the OPC area is compared with the value in the data table that defines the relationship between the recording speed and the recording power stored in the storage unit 9, and the ratio is calculated. By calculating, a double speed equal to or lower than the upper limit value of the maximum recording power is calculated (step 104). That is, when the optimum recording power in OPC becomes 27.6 mW, the ratio of the recording power of 16 times speed (25.2 mW) and the maximum recording power (75 mW) of the data table in FIG. The maximum recording speed is 51.375 times.

  The calculated maximum recording speed is stored in the data table, and the corresponding multiplication ratio is stored in the multiplier setting register 17 (step 105). Therefore, in the actual recording operation, the data table and the multiplier setting register 17 are referred to, and the recording operation is executed at the maximum recording speed of 51.375 times. The speed profile at this time is as shown in FIG.

  For these reasons, in this embodiment, the maximum recording speed of each optical disc 1 is set for each standardized 52 ×, 48 ×, 40 × speed, etc., according to the optimum recording power during the OPC operation. Instead, any variable speed can be set as the maximum recording speed to realize the recording operation.

  As described above, the embodiments of the present invention have been described in detail with reference to the drawings, but the specific configuration is not limited to these embodiments, and includes design changes and the like within a scope not departing from the gist of the present invention. It is. For example, in the present embodiment, CD-R, DVD-R, CD-RW, and DVD-RW are exemplified as the optical disk, but the present invention is not limited to this, and other forms of optical disks may be used.

  In addition, the present embodiment has been described particularly with respect to the recording method of the PCAV system, but it can also be applied to the CAV system and the Z-CLV system.

It is a block diagram of the optical disk recording device based on this invention. It is a block diagram of the spindle control signal production | generation part in an endic IC. 3 is a recording speed profile of the present invention. It is an operation | movement flowchart of this invention. It is a conventional recording speed profile. It is the figure which showed an example of the data table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Optical disk, 2 ... Spindle motor, 3 ... Optical pick-up, 4 ... Feed motor, 5 ... Signal processing IC, 6 ... CPU, 7 ... Driver IC, 8 * .. Endic IC, 9 ... storage unit, 10 ... speed / phase information generation unit, 11 ... PLL, 12 ... Xtal, 13 ... frequency divider, 14 ... frequency division Device setting register, 15 ... switch switching register, 16 ... multiplier, 17 ... multiplier setting register, 18 ... switch, 19 ... adder,

Claims (6)

An optical disk device for recording information on an optical disk,
A data table for storing recording speed and recording power in association with each other;
A recording speed reading means for reading a maximum recording speed recorded in advance on the optical disc;
Recording power detection means for recording information at a predetermined recording speed in the test writing area and detecting optimum recording power;
Recording power selection means for selecting a recording power corresponding to the maximum recording speed read by the recording speed reading means from the data table;
Recording speed calculation for calculating the optimum maximum recording speed for the optical disc based on the recording power corresponding to the highest recording speed selected by the recording power selection means and the optimum recording power detected by the recording power detection means An optical disc apparatus having means.   2. The optical disc apparatus according to claim 1, wherein the recording speed calculated by the recording speed calculation means is a variable double speed.   3. The optical disc apparatus according to claim 2, wherein the resolution of the variable double speed is equal to or less than a single speed. Reading the highest recording speed pre-recorded on the optical disc;
Recording information at a predetermined recording speed in the test writing area, and detecting an optimum recording power;
Selecting a recording power corresponding to the read maximum recording speed from a data table for storing the recording speed and the recording power in association with each other;
An optical disc method comprising: calculating an optimum maximum recording speed for the optical disc based on a recording power corresponding to the selected maximum recording speed and the detected optimum recording power.   5. The optical disk recording method according to claim 4, wherein the calculated recording speed is a variable double speed.   6. The optical disk recording method according to claim 5, wherein the resolution of the variable double speed is equal to or less than a single speed.

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