JP3682223B2 - Multi-beam optical disc apparatus and light beam irradiation position moving method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-beam optical disk apparatus that uses a plurality of light beams for at least one of reading and writing data on an optical disk, and more particularly to a multi-beam optical disk apparatus that can reduce the time required for jumping between tracks in accessing an optical disk. About.
[0002]
[Prior art]
For example, an optical disc apparatus such as a CD player that plays a CD (Compact Disc) can randomly access a required track during playback or recording. For this reason, an actuator including an optical pickup for reading / writing recorded information may be jumped between tracks (track jump).
In such a track jump, a jump when the number of tracks between the irradiation position before the light beam jump and the jump destination track is a predetermined number or more is a long jump, and a jump less than the predetermined number is a short jump. Called.
[0003]
In the case of a long jump, the amount of movement of the light beam in the track-to-track direction, that is, in the radial direction of the optical disk increases, so that normal tracking control is not sufficient. For this reason, sled drive control for a long jump exceeding a predetermined number of tracks is performed using a sled control system that moves an actuator including an optical pickup in the radial direction of the disk.
[0004]
Conventionally, a multi-beam optical disc apparatus capable of simultaneously reading and writing recorded data on a plurality of tracks using a plurality of light beams, converts the data read corresponding to the plurality of light beams when a track jump is performed. Based on this, it is determined whether or not the jump destination track has been reached.
In other words, when a conventional multi-beam optical disc apparatus performs a track jump such as a long jump or a short jump, data read corresponding to a plurality of light beams is stored in a memory, and stored in the memory at a predetermined timing with good separation. The combined data is combined to execute processing such as demodulation and error correction.
As a result, it is determined whether or not it has been possible to jump to the required track.
[0005]
For example, a multi-beam optical disk apparatus that reads data recorded on an optical disk using five light beams stores data for five tracks read corresponding to the five light beams in a memory. After that, the multi-beam optical disc apparatus reads data from the memory and combines them each time a predetermined timing arrives, and executes processing such as demodulation and error correction.
[0006]
[Problems to be solved by the invention]
In the conventional multi-beam optical disk device, when performing track jump, the timing and method for combining data stored in the memory are fixed, and therefore, a certain time is required for data demodulation and error correction. . That is, when a conventional multi-beam optical disc apparatus performs a track jump, whether or not the jump destination is reached using all data read corresponding to a plurality of light beams, as in normal data reading. Is determined.
[0007]
For this reason, when track jumps are frequently performed, the time required to read out the required data increases, and the power consumption increases as the processing amount increases.
[0008]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a multi-beam optical disc apparatus capable of quick track jumping and reducing power consumption.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a multi-beam optical disc apparatus according to the first aspect of the present invention provides:
A beam irradiating means for irradiating a plurality of light beams onto an optical disc to perform at least one of reading and writing of recorded data;
Demodulating means for performing demodulation and error correction of recording data based on a result of detecting return light of a plurality of light beams irradiated to the optical disk by the beam irradiating means;
Control means for controlling a track jump for moving the irradiation positions of the plurality of light beams emitted by the beam irradiation means in the radial direction of the optical disk based on the recording data demodulated by the demodulation means;
The control means includes
Determine whether the number of tracks between the current irradiation position of the light beam and the jump destination track is less than a predetermined number of tracks,
If it is determined that the number of tracks is less than a predetermined number of tracks, whether or not the demodulating unit is controlled to identify the irradiation position of the light beam using all the light beams emitted by the beam irradiating unit, and the target track is reached If it is determined that the target track has not been reached, the demodulating means is controlled to use a part of the plurality of light beams emitted by the beam irradiating means. Execute the short jump control to set the jump destination track so that it can be specified,
When it is determined that the number of tracks is equal to or greater than the predetermined number of tracks, the demodulating unit is controlled to identify the irradiation position of the light beam using all the light beams emitted by the beam irradiation unit, and the target track and the predetermined number of tracks are determined. It is determined whether or not a certain range of tracks including the error track has been reached, and when it is determined that a certain range of tracks has been reached, the demodulating unit is controlled to control the plurality of beams emitted by the beam irradiation unit. Execute long jump control to set the jump destination track so that it can be specified using a part of the light beam.
It is characterized by that.
[0010]
According to the present invention, when executing the track jump, the control means controls the demodulation means, and uses the partial light beams of the plurality of light beams emitted by the beam irradiation means to specify the jump destination. Identify the track.
As a result, the amount of processing required for the track jump can be reduced, and a quick track jump can be performed to reduce power consumption.
[0013]
A multi-beam optical disc apparatus according to a second aspect of the present invention is:
Irradiating the optical disk with a plurality of light beams to perform at least one of reading and writing of recorded data,
When performing a track jump that moves the position of the optical beam irradiating the optical disk in the radial direction of the optical disk, the number of light beams used to specify the jump destination track among a plurality of light beams can be switched. it can,
It is characterized by that.
[0014]
According to the present invention, when performing a track jump, the number of light beams used for specifying a jump destination track can be switched, and a part of a plurality of light beams can be used to specify a jump destination. Tracks can be specified.
As a result, the processing amount required for the track jump can be reduced, and a quick track jump can be performed, thereby reducing the power consumption.
[0015]
The light beam irradiation position moving method according to the third aspect of the present invention is:
A method for moving a position at which an optical disk is irradiated with a plurality of light beams in a radial direction of the optical disk,
A light detection step of detecting return light by irradiating the optical disk with a plurality of light beams;
Based on the result of detecting the return light in the light detection step, a demodulation step for performing demodulation and error correction of the recording data;
A control step for controlling a track jump for moving the irradiation positions of a plurality of light beams in the radial direction of the optical disk based on the recording data demodulated in the demodulation step;
The control step includes
Determine whether the number of tracks between the current irradiation position of the light beam and the jump destination track is less than a predetermined number of tracks,
When it is determined that the number of tracks is less than a predetermined number of tracks, all the light beams irradiated on the optical disc in the light detection step are used in the demodulation step to identify the irradiation position of the light beam, and the target track is reached. And when it is determined that the target track has not been reached, a part of the plurality of light beams applied to the optical disc in the light detection step is used in the demodulation step. Execute short jump control to set the jump destination track so that it can be specified,
When it is determined that the number of tracks is equal to or greater than the predetermined number of tracks, the light beam irradiation position is specified by using all the light beams irradiated to the optical disc in the light detection step in the demodulation step, and the target track and the predetermined number are detected. It is determined whether or not a certain range of tracks is reached, and when it is determined that a certain range of tracks is reached, among the plurality of beams irradiated to the optical disc in the light detection step Long jump control is performed in which a part of the light beam is used in the demodulation step so that a jump destination track can be specified;
It is characterized by that.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A multi-beam optical disc apparatus according to an embodiment of the present invention will be described in detail below with reference to the drawings.
[0017]
FIG. 1 is a diagram showing a configuration of a multi-beam optical disc apparatus 100 according to an embodiment of the present invention.
The multi-beam optical disc apparatus 100 can irradiate the optical disc 1 with a plurality of light beams to detect return light, and combine and reproduce data read corresponding to each of the plurality of light beams.
[0018]
As shown in FIG. 1, the multi-beam optical disc apparatus 100 includes, for example, an actuator 2, a spindle motor 3, an ASP (Analog Signal Processor) 4, a servo signal processing circuit 5, and a DSP (Digital Signal Processor) 6. , A CPU (Central Processing Unit) 7, a memory 8, a driver 9, and an ATAPI (AT Attachment Packet Interface) 10.
[0019]
The actuator 2 emits a light beam for reading and writing recorded data to the optical disc 1, drives the optical pickup for detecting return light, and drives the optical pickup for positioning and adjusting the beam intensity. A drive device is provided. The actuator 2 can emit a plurality of (for example, five) light beams and detect return light, generate a light amount change current corresponding to the intensity of the return light of each detected light beam as a reproduction signal, Send to ASP4.
[0020]
The spindle motor 3 is for rotating the optical disk 1 held by a turntable or a clamp mechanism at a predetermined rotational speed under the control of the servo signal processing circuit 5.
[0021]
The ASP 4 is an analog signal processing circuit including, for example, an RF (Radio Frequency) amplifier, a waveform equalizer, an error signal filter circuit, and the like. For example, the ASP 4 generates an RF signal obtained by converting the light amount change current received from the actuator 2 into a voltage, and equalizes the waveform of the signal.
[0022]
The servo signal processing circuit 5 is for driving the actuator 2 and the spindle motor 3 via the driver 9 in order to read data recorded on the optical disc 1 under the control of the CPU 7.
Further, the servo signal processing circuit 5 can receive error signals such as a tracking error signal and a focus error signal from the ASP 4 and control the operations of the actuator 2 and the spindle motor 3 to remove the error.
[0023]
The DSP 6 is a digital signal processing circuit for performing demodulation and error correction of the RF signal generated by the ASP 4.
[0024]
The CPU 7 is a microprocessor for controlling the operation of the entire multi-beam optical disc apparatus 100.
For example, when the actuator 2 moves in the radial direction of the optical disc 1, the CPU 7 specifies the amount of movement of the actuator 2 based on the number of tracks on the optical disc 1, and enables movement of required data to the recording position. . That is, for example, when the beam splitter is attached to the sled motor that moves the actuator 2 in the radial direction of the optical disc 1, the CPU 7 is obtained by detecting the reflected light of the light beam irradiated on the beam splitter. Count the number of split passes and replace with the number of tracks. For example, the CPU 7 specifies the period in which the irradiation position of the light beam emitted from the actuator 2 crosses the track of the optical disc 1 based on the tracking error signal detected by the servo signal processing circuit 5. The CPU 7 specifies the amount of movement of the actuator 2 by counting the number of traversed tracks.
[0025]
The memory 8 is composed of a semiconductor storage device such as a RAM (Random Access Memory), for example, and temporarily stores recording data read from the optical disc 1 when the DSP 6 demodulates digital data and corrects errors. The recording data read out corresponding to the light beam is to be combined for reproduction.
[0026]
The driver 9 is a drive circuit for driving the actuator 2 and the spindle motor 3 according to the control of the servo signal processing circuit 5.
[0027]
The ATAPI 10 is an interface for outputting digital data demodulated from an RF signal by the DSP 6 and subjected to error correction to an external device such as a personal computer. In addition, the ATAPI 10 enables writing to the optical disc 1 by supplying digital data input from an external device to the DSP 6.
[0028]
The operation of the multi-beam optical disc apparatus 100 according to the embodiment of the present invention will be described below.
The multi-beam optical disc apparatus 100 enables a quick track jump by using a plurality of light beams emitted from the actuator 2 when jumping between tracks (track jump) in order to search for required data. .
In the following, as an example, it is assumed that the multi-beam optical disc apparatus 100 can read and write recorded data on the optical disc 1 using five light beams.
[0029]
The multi-beam optical disc apparatus 100 performs a short jump process shown in the flowchart of FIG. 2 or a long jump process shown in the flowchart of FIG. 3 when a track jump command is given by a control signal or the like input from an external device through the ATAPI 10, for example. Execute.
[0030]
At this time, the CPU 7 determines the read position of the required data according to the type and amount of data instructed to be read or written by the control signal input from the external device, the data recording status on the optical disc 1, etc. Alternatively, the address indicating the writing position is specified, and the movement amount of the light beam from the current irradiation position is specified.
The CPU 7 determines whether the track jump is a short jump or a long jump based on the number of tracks corresponding to the specified movement amount.
[0031]
The short jump process shown in the flowchart of FIG. 2 is performed when the multi-beam optical disc apparatus 100 performs a short jump in which the number of tracks between the current irradiation position of the light beam and the jump destination track is less than a predetermined number. It is a process to be executed. Further, the long jump process shown in the flowchart of FIG. 3 is performed when the long jump in which the number of tracks between the current irradiation position of the light beam and the jump destination track is a predetermined number or more is performed. 100 is a process executed.
[0032]
The short jump process shown in the flowchart of FIG. 2 will be described below.
[0033]
When the short jump process is started, the CPU 7 controls the ASP 4 and the DSP 6 to set the jump destination track so that it can be specified using all the light beams emitted by the actuator 2 (step S1). That is, the CPU 7 uses the five light beams emitted from the actuator 2 to set the jump destination track so that it can be specified.
As a result, the DSP 6 stores the data for five tracks read corresponding to the five light beams emitted from the actuator 2 in the memory 8 and is stored in the memory 8 every time a predetermined timing arrives. Data is read and combined to enable demodulation and error correction.
[0034]
The CPU 7 executes a short jump by sending a track jump command to the servo signal processing circuit 5 (step S2).
The servo signal processing circuit 5 responds to the command received from the CPU 7 and executes a short jump by executing the tracking control of the actuator 2 by the driver 9 based on the tracking error signal received from the actuator 2 via the ASP 4. Execute.
[0035]
The CPU 7 determines whether or not the target jump destination track (target track) has been reached by confirming the requested address from the data obtained as a result of the signal processing by the ASP 4 and the DSP 6 (step) S3).
[0036]
If the CPU 7 determines that the target track has not been reached (NO in step S3), the CPU 7 controls the ASP 4 and DSP 6 to use a part of the five light beams emitted by the actuator 2. The jump destination track is set so as to be specified (step S4).
For example, the CPU 7 uses three light beams or one light beam among the light beams emitted from the actuator 2 so as to specify the jump destination track.
The DSP 6 demodulates and error-corrects only three of the light beams emitted from the actuator 2 or data corresponding to one light beam, and provides the data to the CPU 7.
[0037]
In this way, the processing amount required for the track jump is reduced by switching to the operation of specifying the jump destination track using a part of the plurality of light beams. That is, the DSP 6 demodulates the data read from the optical disc 1 and corrects the error and provides it to the CPU 7 without being restricted by a predetermined timing for reading and combining the data stored in the memory 8. be able to.
As a result, a quick track jump is possible, and power consumption can be reduced.
[0038]
After that, the CPU 7 returns the process to step S2 and sends a command to the servo signal processing circuit 5 to execute a short jump.
[0039]
If the CPU 7 determines that the target track has been reached in step S3 (YES in step S3), the CPU 7 sends a command to the ASP 4 and DSP 6 to read and write recorded data on the optical disc 1. Is started (step S5).
As a result, it is possible to write data input from an external device through the ATAPI 10 to the optical disc 1 and output data read from the optical disc 1 to the external device.
[0040]
Next, the long jump process shown in the flowchart of FIG. 3 will be described.
[0041]
When the long jump process is started, the CPU 7 controls the ASP 4 and the DSP 6 to use all the light beams emitted from the actuator 2 so that the jump destination track can be specified (step S10). That is, the CPU 7 uses the five light beams emitted from the actuator 2 to set the jump destination track so that it can be specified.
As a result, the DSP 6 stores the data for five tracks read corresponding to the five light beams emitted from the actuator 2 in the memory 8 and is stored in the memory 8 every time a predetermined timing arrives. Data is read and combined to enable demodulation and error correction.
[0042]
The CPU 7 executes a long jump by sending a track jump command to the servo signal processing circuit 5 (step S11).
The servo signal processing circuit 5 responds to a command received from the CPU 7 and drives, for example, a thread motor (not shown) that moves the actuator 2 in the radial direction of the optical disk 1 by the driver 9 according to the number of tracks to be jumped. A long jump is executed by supplying a pulse or the like.
[0043]
The CPU 7 determines whether or not the target jump destination track (target track) has been reached by confirming the requested address from the data obtained as a result of the signal processing by the ASP 4 and DSP 6 ( Step S12).
In this case, the target track that is a determination criterion is used to determine whether or not the light beam irradiation position is to be further jumped, and a predetermined number of errors that can be adjusted by a short jump to the correct target track. It is a range of tracks including tracks.
[0044]
If CPU 7 determines that it has not reached a certain range of tracks (NO in step S12), it returns the process to step S11 and continues the long jump.
[0045]
On the other hand, when determining that the track has reached a certain range (YES in step S12), the CPU 7 obtains the number of error tracks from the current irradiation position of the light beam to the accurate target track (step S13).
[0046]
After that, the CPU 7 controls the ASP 4 and the DSP 6 to set the jump destination track so as to be able to be specified using a part of the five light beams emitted from the actuator 2 (step S14).
For example, the CPU 7 uses three light beams or one light beam among the light beams emitted from the actuator 2 so as to specify the jump destination track.
The DSP 6 demodulates and error-corrects only three of the light beams emitted from the actuator 2 or data corresponding to one light beam, and provides the data to the CPU 7.
[0047]
The CPU 7 executes a short jump by sending a track jump command to the servo signal processing circuit 5 (step S15).
In response to the command received from the CPU 7, the servo signal processing circuit 5 performs tracking control of the actuator 2 by the driver 9 based on the tracking error signal received from the actuator 2 via the ASP 4, and so on. Execute.
As described above, only the data corresponding to a part of the plurality of light beams is demodulated and error-corrected and used for the short jump, so that the processing amount required for the track jump can be reduced.
As a result, a quick track jump is possible, and power consumption can be reduced.
[0048]
After that, the CPU 7 confirms the requested address from the data obtained as a result of the signal processing by the ASP 4 and the DSP 6 to determine whether or not the target jump destination track (target track) has been reached. It discriminate | determines (step S16).
[0049]
If the CPU 7 determines that the target track has not been reached (NO in step S16), the CPU 7 controls the ASP 4 and DSP 6 to use any one of the five light beams emitted by the actuator 2. Thus, the jump destination track can be specified (step S17).
In other words, the DSP 6 demodulates and corrects only data corresponding to any one of the light beams emitted from the actuator 2 and supplies the data to the CPU 7.
[0050]
Thereafter, the CPU 7 returns the process to step S15 and sends a command to the servo signal processing circuit 5 to execute a short jump.
[0051]
If the CPU 7 determines in step S16 that the target track has been reached (YES in step S16), the CPU 7 sends a command to the ASP 4 and DSP 6 to read and write the recording data on the optical disc 1. Is started (step S18).
As a result, it is possible to write data input from an external device through the ATAPI 10 to the optical disc 1 and output data read from the optical disc 1 to the external device.
[0052]
As described above, according to the present invention, when a track jump is performed, a jump destination track can be specified by using a part of a plurality of light beams emitted from the actuator 2. The amount of processing required can be reduced.
As a result, a quick track jump is possible, and power consumption can be reduced.
[0053]
In the above embodiment, as an example, it has been described that the recording data can be read and written on the optical disc 1 using five light beams. However, the present invention is not limited to this. The present invention can also be applied when using a beam (for example, seven light beams).
[0054]
In addition, as the optical disk 1 to be used for reading and writing recorded data, for example, a light beam such as CD (Compact Disc), MD (Mini Disc), LD (Laser Disc), DVD (Digital Versatile Disc) is used. Any disc-shaped recording medium that can perform track jumping can be used.
[0055]
【The invention's effect】
As described above, according to the present invention, when a track jump is performed, a jump destination track can be specified by using a part of a plurality of light beams, and the processing amount required for the track jump Can be reduced.
As a result, a quick track jump is possible, and power consumption can be reduced.
[Brief description of the drawings]
FIG. 1 is a diagram showing a configuration of a multi-beam optical disc apparatus according to an embodiment of the present invention.
FIG. 2 is a flowchart for explaining short jump processing;
FIG. 3 is a flowchart for explaining long jump processing;
[Explanation of symbols]
1 Optical disk 2 Actuator 3 Spindle motor 4 ASP
5 Servo signal processing circuit 6 DSP
7 CPU
8 Memory 9 Driver 10 ATAPI
100 Multi-beam optical disk device

Claims (3)

A multi-beam optical disk apparatus comprising beam irradiation means for irradiating an optical disk with a plurality of light beams to perform at least one of reading and writing of recorded data,
Demodulating means for performing demodulation and error correction of recording data based on a result of detecting return light of a plurality of light beams irradiated to the optical disc by the beam irradiating means;
Control means for controlling a track jump for moving the irradiation positions of the plurality of light beams emitted by the beam irradiation means in the radial direction of the optical disk based on the recording data demodulated by the demodulation means;
The control means includes
Determine whether the number of tracks between the current irradiation position of the light beam and the jump destination track is less than a predetermined number of tracks,
If it is determined that the number of tracks is less than the predetermined number of tracks, whether the light beam irradiation position is specified using all the light beams emitted from the beam irradiation unit by controlling the demodulating unit, and the target track is reached. If it is determined that the target track has not been reached, the demodulating means is controlled to use a part of the plurality of light beams emitted by the beam irradiating means. Execute short jump control to set the jump destination track so that it can be specified,
When it is determined that the number of tracks is equal to or greater than the predetermined number of tracks, the demodulating unit is controlled to identify the irradiation position of the light beam using all the light beams emitted by the beam irradiation unit, and the target track and the predetermined number of tracks are determined. It is determined whether or not a certain range of tracks including the error track has been reached, and when it is determined that a certain range of tracks has been reached, the demodulating unit is controlled to control the plurality of beams emitted by the beam irradiation unit. Execute long jump control to set the jump destination track so that it can be specified using a part of the light beam.
A multi-beam optical disc apparatus characterized by the above. A multi-beam optical disc apparatus that irradiates an optical disc with a plurality of light beams to perform at least one of reading and writing of recorded data,
When performing a track jump that moves the position of the optical beam irradiating the optical disk in the radial direction of the optical disk, the number of light beams used to specify the jump destination track among a plurality of light beams can be switched. it can,
A multi-beam optical disc apparatus characterized by the above. A light beam irradiation position moving method for moving a position at which an optical disk is irradiated with a plurality of light beams in a radial direction of the optical disk,
A light detecting step of irradiating the optical disk with a plurality of light beams to detect return light;
Based on the result of detecting the return light in the light detection step, a demodulation step for performing demodulation and error correction of the recording data;
A control step for controlling a track jump for moving the irradiation positions of a plurality of light beams in the radial direction of the optical disk based on the recording data demodulated in the demodulation step;
The control step includes
Determine whether the number of tracks between the current irradiation position of the light beam and the jump destination track is less than a predetermined number of tracks,
When it is determined that the number of tracks is less than the predetermined number of tracks, all the light beams irradiated on the optical disc in the light detection step are used in the demodulation step to identify the irradiation position of the light beam, and the target track is reached. And when it is determined that the target track has not been reached, a part of the plurality of light beams applied to the optical disc in the light detection step is used in the demodulation step. Execute short jump control to set the jump destination track so that it can be specified,
When it is determined that the number of tracks is equal to or greater than the predetermined number of tracks, the light beam irradiation position is specified by using all the light beams irradiated to the optical disc in the light detection step in the demodulation step, and the target track and the predetermined number are detected. It is determined whether or not a certain range of tracks is reached, and when it is determined that a certain range of tracks is reached, among the plurality of beams irradiated to the optical disc in the light detection step Long jump control is performed in which a part of the light beam is used in the demodulation step so that a jump destination track can be specified;
A method for moving a light beam irradiation position.

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