JP2002008306A - Optical disk drive - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To reduce power consumption due to operation of an unused circuit in an optical disk device capable of compatible reproduction of an optical disk with and without a pre-groove. When a wobble signal is not received and an ATIP signal is not generated in a wobble signal demodulation means, a circuit operation control means detects this and a reproduced optical disc having no pre-groove is reproduced. Is determined, the output of the output switching means 8 is switched to the control signal from the rotation control signal generation means 5, and the operations of the wobble signal demodulation means 6 and the rotation control signal generation means 7 are stopped.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk apparatus for recording and reproducing data on and from an optical disk, and more particularly to a compatible optical disk having a guide groove formed in a meandering form and a read-only optical disk having no guide groove. Optical disk device.

[0002]

2. Description of the Related Art In recent years, CD-R (CD-Record), which can be written only once, among CD (Compact Disk) type optical disks, which have become widespread as digital data recording media.
capable), and a CD-RW that can be written multiple times
(CD-Rewritable) has a guide groove called a pre-groove formed along a track on which data is recorded. In an optical disk device that performs recording and reproduction of CD-R and CD-RW by using the pre-groove, both edge components of the groove are detected from the laser light reflected on the optical disk surface.
Based on this detection signal, tracking control is performed so that the laser light irradiated on the optical disk becomes the center of both edges.

The pregroove is slightly meandering, and the meandering state is formed according to a so-called wobble signal. The wobble signal is a signal obtained by performing frequency modulation on a signal having a predetermined center frequency.
The modulation component of the wobble signal indicates the absolute time information of the optical disc, that is, the physical address, and the ATIP (Ab
solute Time In Pre-Groove). CD-
When recording and reproducing R and CD-RW, this ATI
P is demodulated from the wobble signal and used for managing and specifying the recording location.

In recording such CD-R and CD-RW data, a high-power laser beam is irradiated in accordance with a recording signal along a pre-groove on an optical disk formed at the time of manufacture, and the laser beam is recorded. This is because the optical characteristics of the irradiated portion change due to heat, and pits having low reflectivity are generated. Therefore, the CD-ROM (CD-ReadOn
pits are recorded in the same manner as data on a read-only optical disc in which pits are physically formed, such as ly Memory).
Therefore, in most cases, a CD-R or CD-RW recording / reproducing apparatus can reproduce a conventional read-only optical disc such as a CD-ROM.

[0005]

The physical address signal of a conventional read-only optical disk having no guide groove is usually included in recorded data. That is,
The laser light reflected from the optical disk surface is detected by a light receiving element, and the detection signal is converted into a voltage to generate an RF (radio).
o Frequency) signal, a physical address signal is extracted. The RF signal is used not only for specifying the reproduction position, but also for controlling the rotation of the optical disk when rotating at a constant linear velocity.

However, as described above, CD-R, CD-
An optical disc having a pre-groove such as RW can obtain a physical address signal (ATIP) from a wobble signal recorded by the pre-groove. When recording on such an optical disk, a wobble signal is extracted from the detection signal of the light receiving element as a difference signal (push-pull signal) of the edge component of the meandering pre-groove, and demodulated to obtain ATIP information and optical disk rotation information. To generate a rotation control signal for the optical disk. Also, although the physical address signal is included in the recording signal when recorded, the signal may not be recorded on the entire optical disc. The ATIP information and the optical disk rotation information are extracted to control the rotation of the optical disk.

For this reason, in a conventional CD-R / CD-RW recording / reproducing apparatus capable of compatible reproduction of a read-only optical disk, a circuit system for extracting a physical address signal from an RF signal and generating a rotation control signal for the optical disk. And a circuit system that obtains ATIP information and optical disk rotation information from a wobble signal and generates a rotation control signal is used by switching according to the type of optical disk to be recorded or reproduced.

By the way, in the above-mentioned optical disk apparatus capable of compatible playback of a conventional read-only optical disk and a recordable optical disk, when playing back a read-only optical disk,
Although a circuit system for extracting a wobble signal to obtain ATIP information and optical disk rotation information and generating a rotation control signal for the optical disk is not used, a function for stopping the operation of this portion has not been provided. For this reason, unnecessary power is consumed when reproducing the read-only optical disk, which causes an increase in power consumption and heat generation of the entire apparatus.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to provide an optical disk apparatus in which the operation of unused circuits is stopped to reduce power consumption.

[0010]

According to the present invention, in order to solve the above-mentioned problem, a recordable optical disk in which guide grooves of recording tracks are formed in a meandering manner is compatible with a read-only optical disk in which the guide grooves are not formed. In a reproducible optical disk device, a light receiving unit for receiving a laser beam reflected on a recording surface of an optical disk, a signal generating unit for converting a light receiving signal of the light receiving unit into a voltage value, and generating an RF signal and a wobble signal, RF signal demodulating means for demodulating the RF signal and detecting a physical address signal on the read-only optical disc; and a first rotation control signal for controlling the rotation of the read-only optical disc based on the demodulated RF signal. First rotation control signal generating means for generating, and ATI indicating the physical address on the recordable optical disc, demodulating the wobble signal. Wobble signal demodulation means for detecting a signal, second rotation control signal generation means for demodulating the ATIP signal and generating a second rotation control signal for controlling rotation of the recordable optical disc, and Output switching means for switching and outputting a rotation control signal and the second rotation control signal;
Circuit operation control for instructing the output switching means to output the first rotation control signal when the TIP signal is not detected, and stopping the operations of the wobble signal demodulation means and the second rotation control signal generation means Means are provided.

In such an optical disk apparatus, when reproducing a read-only optical disk, the operation of a circuit system for generating a rotation control signal of the optical disk by detecting a wobble signal is stopped, thereby reducing unnecessary power consumption. And
The calorific value of the device can be suppressed.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram schematically showing an optical disk device of the present invention. The optical disk device 1 has a C
Performs recording and reproduction on a recordable optical disk provided with meandering guide grooves (pre-grooves) such as DR and CD-RW, and reproduces reproduction-only optical disks without guide grooves such as CD-ROMs. I do.

When an optical disk is loaded into the optical disk device 1, the surface of the optical disk is irradiated with laser light, and the reflected light is received by a light receiving means 2 for performing photoelectric conversion. This light receiving signal is converted into a voltage value by the signal generating means 3, and an RF signal and a wobble signal are generated. The RF signal is information recorded on a recording track of the optical disk, and includes information reproduced and output to the outside and physical address information on the optical disk. The wobble signal is a CD-R or CD-RW
And the physical address information on the optical disk is detected from the meandering state of the pre-groove provided on the recordable optical disk.

The generated RF signal is binarized by the RF signal demodulating means 4 to generate reproduced data recorded on the optical disk and a clock signal thereof. Then, a physical address signal is extracted from the reproduced data. The rotation control signal generating means 5 is configured to perform the following based on the binarized RF signal.
Rotation control information for controlling the rotation of the optical disk is generated.

On the other hand, the wobble signal generated by the signal generator 3 is binarized by the wobble signal demodulator 6 to extract a physical address signal (ATIP). The rotation control signal generating means 7 generates a rotation control signal for controlling the rotation of the optical disc based on the binarized wobble signal.

The output switching means 8 switches and outputs the respective rotation control signals generated by the rotation control signal generating means 5 and 7. When the wobble signal demodulation means 6 does not generate the ATIP signal, the circuit operation control means 9 detects this, and causes the output switching means 8 to switch the output to the signal from the rotation control signal generation means 5. Simultaneously with the instruction, the operations of the wobble signal demodulating means 6 and the rotation control signal generating means 7 are stopped.

Next, FIG. 2 shows an example of the configuration of an optical disk device according to the present invention. The optical disc device 1 is a CD-R, a CD-R
It performs recording and reproduction on a recordable optical disk provided with meandering guide grooves (pre-grooves) such as W, and reproduces reproduction-only optical disks without guide grooves such as CD-ROMs.

The optical disk 11 has a spindle motor 20
The laser light emitted from the optical pickup 12 is reflected by the signal recording surface of the optical disk 11,
The reflected light is received by the light receiving element of the optical pickup 12. The optical pickup 12 is provided with a two-axis actuator for moving an objective lens so that a laser beam correctly forms a spot on a track of the optical disk 11 and is correctly irradiated without deviating from the track. Further, the optical pickup 12 is provided with a sled actuator configured to move the biaxial actuator from the inner peripheral portion to the outer peripheral portion in the radial direction of the optical disk, for example, a linear motor or the like. The drive control of the two-axis actuator and the sled actuator and the rotation control of the spindle motor 20 are performed by the servo processing unit 21.

When the optical disk 11 is loaded, first, the lead-in area on the inner circumference of the optical disk 11 is reproduced. The laser light received by the light receiving element of the optical pickup 12 is converted into a voltage value by the matrix amplifier 13 to generate a reproduction signal (RF signal), a focus error signal, a tracking error signal, and a wobble signal. The focus error signal and the tracking error signal are sent to the servo processing unit 21, and the servo processing unit 21 controls the driving of the two-axis actuator and the sled actuator of the optical pickup 12 based on these signals and the like.

The RF signal is binarized by an RF signal demodulator 14 to generate reproduction data recorded on the optical disk 11 and a clock signal thereof. Also, EFM (Eight Fourteen
Modulation) demodulation processing and error correction processing are performed. The reproduction data is converted into a predetermined data format such as an audio signal and a computer program in the reproduction signal processing unit 22. The input / output interface 23 converts the decoded reproduction data into, for example, SCSI (Smal
(l. Computer System Interface) format and the like, and transmit them to an external device such as the host computer 30. The input / output interface 23 receives a control command from the host computer 30 or the like, read file information, and the like, and supplies the control command to the control CPU 19.

On the other hand, a physical address signal indicating the absolute information of the reproduction position of the optical disk 11 is extracted from the reproduction data generated by the RF signal demodulation unit 14, and a rotation control signal generation unit 15 Generate a rotation control signal for controlling the rotation of.

The wobble signal generated by the matrix amplifier 13 is supplied to a wobble signal demodulator 16. The wobble signal demodulation unit 16 demodulates and generates a physical address signal (ATIP) of the optical disk 11 included in the modulation component of the wobble signal. The rotation control signal generator 17 generates a rotation control signal for controlling the rotation of the spindle motor 20 based on the demodulated wobble signal.

The output switching unit 18 switches the rotation control signals generated by the two systems of the rotation control signal generation units 15 and 17, and outputs the rotation control signals to the servo processing unit 21. The servo processing unit 21 controls the spindle motor 20 when the optical disc 11 is driven to rotate at a constant linear velocity.

The control CPU 19 receives a control signal from the host computer 30 or the like via the input / output interface 23 and controls the RF signal demodulator 14 and the servo processor 21. For example, monitoring of error correction processing in the RF signal demodulation unit 14 and control of starting and stopping rotation of the spindle motor 20 are performed.

When the control CPU 19 detects that the ATIP signal has been generated by the wobble signal demodulation unit 16, the control CPU 19 determines that the optical disk 11 is a recordable optical disk such as a CD-R or a CD-RW, and switches the output. An instruction to switch the output of the section 18 to a rotation control signal from the rotation control signal generation section 17 generated from the wobble signal is output. Thereafter, when an instruction to reproduce or record the optical disk 11 is issued from the host computer 30 or the like, the spindle motor 20 is rotated by the control of the servo processing unit 21 based on the rotation control signal generated from the wobble signal. .

When a read-only optical disk having no pre-groove is played back as the optical disk 11,
Since no wobble signal is recorded on the read-only optical disc, the wobble signal demodulation unit 16 does not receive the wobble signal and does not generate an ATIP signal. Control CPU1
9 shows that the wobble signal demodulation unit 16 performs ATIP when the optical disk 11 is loaded and the lead-in is reproduced.
When it is detected that no signal has been generated, it is determined that the loaded optical disk 11 is a read-only optical disk, and the output signal of the output switching unit 18 is output from the RF signal output from the rotation control signal generation unit 15. At the same time as issuing an instruction to switch to the generated rotation control signal of the circuit system, the clock input to the unused wobble signal demodulation unit 16 and rotation control signal generation unit 17 is stopped, and the power supply is cut off. Thus, by the control CPU 19,
At the time of loading the optical disk 11, the type of the loaded optical disk 11 is automatically determined, so that it is possible to save power consumed by a circuit system that is not used when reproducing a read-only optical disk such as a CD-ROM. In addition, heat generation of the apparatus due to power consumption can be suppressed. Further, by reducing wasteful power consumption, a necessary power supply capacity can be suppressed, and the power supply device can be downsized.

FIG. 3 shows a processing procedure after loading the optical disk. When the optical disk 11 is loaded into the disk drive (S301), the control CPU 19 sets the circuits of the wobble signal demodulation unit 16 and the rotation control signal generation unit 17 in operation (S302), and sets the spindle motor 2
The optical disk 11 is rotated by 0 (S303).
The optical pickup 12 is controlled by an instruction from the control CPU 19.
Is driven, the objective lens is moved so as to irradiate the lead-in on the optical disk 11 with the laser beam, and the focus servo and the tracking servo operate (S30).
4). At this time, the number of rotations of the spindle motor 20 is set in advance to the number of rotations most suitable for detecting the wobble signal by the wobble signal demodulation unit 16 during the lead-in reproduction of the optical disk 11.

When a light receiving signal is detected by the optical pickup 12, the wobble signal demodulator 16 detects a wobble signal from the signal generated by the matrix amplifier 13, and
The control CPU 19 determines the type of the loaded optical disk 11 depending on whether this is detected and an ATIP signal is generated (S305). When a wobble signal is input to the wobble signal demodulation unit 16 and an ATIP signal is generated, the control CPU 19 determines that the optical disk 11 is a recordable optical disk such as a CD-R, and a spindle motor 20 generated from the wobble demodulation signal. Output switching unit 18 so that the rotation control signal of
(S306).

Thereafter, when the host computer 30 or the like sends instructions to reproduce and record the optical disk 11 (S307), the servo processing unit 21 uses the spindle motor 20 based on the rotation control signal generated from the wobble signal. Is rotated, and reproduction and recording of the optical disk 11 are performed.

On the other hand, if no wobble signal is received by the wobble signal demodulation section 16 and no ATIP signal is generated, the control CPU 19 detects this, and the loaded optical disk 11 is read only from a CD-ROM or the like. It determines that the optical disc is an optical disc, and sends an instruction to switch the output of the output switching unit 18 to the rotation control signal from the rotation control signal generation unit 15 (S308). At this time, since a circuit system for generating a rotation control signal based on the wobble signal becomes unnecessary, the operations of the wobble signal demodulator 16 and the rotation control signal generator 17 are stopped by the processing of the control CPU 19 (S309).

Therefore, thereafter, the host computer 3
When an instruction to reproduce the optical disk 11 is sent from 0 or the like (S310), the servo processing unit 21 receives the rotation control signal generated from the reproduction data recorded on the optical disk 11, and controls the rotation of the spindle motor 20. The playback data decoded by the playback signal processor 22 is output to the host computer 30 and the like through the input / output interface 23.

[0032]

As described above, in the optical disk apparatus of the present invention, when reproducing a read-only optical disk, the operation of the circuit system for generating the rotation control signal of the optical disk by detecting the wobble signal is stopped. In addition, unnecessary power consumption can be reduced, and the amount of heat generated by the device can be suppressed. In addition, necessary power supply capacity can be suppressed by reducing wasteful power consumption, and the power supply device can be downsized.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing an optical disk device of the present invention.

FIG. 2 is a diagram showing a configuration example of an optical disk device of the present invention.

FIG. 3 is a flowchart showing a processing procedure after loading an optical disc;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk apparatus, 2 ... Light receiving means, 3 ... Signal generation means, 4 ... RF signal demodulation means, 5 ... Rotation control signal generation means, 6 ... Wobble signal demodulation means, 7 ... Rotation control signals Generating means 8, output switching means 9, circuit operation controlling means

Claims (5)

[Claims] 1. An optical disc device capable of compatible reproduction of a recordable optical disc having a guide track of a recording track meandering formed thereon and a read-only optical disc having no guide groove formed therein, the light reflected from the recording surface of the optical disc. Light receiving means for receiving a laser beam; signal generating means for converting a light receiving signal of the light receiving means into a voltage value to generate an RF signal and a wobble signal; demodulating the RF signal; RF signal demodulation means for detecting an address signal; first rotation control signal generation means for generating a first rotation control signal for controlling rotation of the read-only optical disc from the demodulated RF signal; Wobble signal demodulation means for demodulating the AT and detecting an ATIP signal indicating the physical address on the recordable optical disc; Second rotation control signal generating means for demodulating an IP signal and generating a second rotation control signal for controlling the rotation of the recordable optical disc; the first rotation control signal and the second rotation control signal Output switching means for switching and outputting the signal; and when the wobble signal demodulation means does not detect the ATIP signal, instructing the output switching means to output the first rotation control signal; And an operation control means for stopping the operation of the second rotation control signal generating means. 2. The circuit operation control means controls a clock input and a power supply to the wobble signal demodulation means and the second rotation control signal generation means when the ATIP signal is not detected by the wobble signal demodulation means. The optical disk device according to claim 1, wherein the optical disk device is cut. 3. The circuit operation control means according to claim 1, wherein said optical disk is loaded, said optical disk is rotated at a preset rotation speed suitable for wobble signal detection, and said lead-in of a recording track is reproduced. 2. The optical disk device according to claim 1, wherein it is determined whether or not the wobble signal is detected by the wobble signal demodulation means from a light receiving signal. 4. The optical disk device according to claim 1, wherein said recordable optical disk is a write once optical disk. 5. The optical disk device according to claim 1, wherein the recordable optical disk is a rewritable optical disk.