JPH11296868A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time of performing recording data verification by making the increasing of the speed of random accessing and the simultaneous recording/reproducing on tracks away from each other on one optical disk possible. SOLUTION: This device is provided with a spindle motor 30, first and second optical pickups P1 and P2, thread motors 11 and 21 for moving the optical pickups independently, thread screw shafts 15 and 25, drivers 12 and 22 for driving the optical pickups independently, DSP 14 and 24 for processing the recording or reproducing data of the respective optical pickups, and a system controller 32 for controlling the entire device.

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 or reproducing data on an optical disk.

[0002]

2. Description of the Related Art Conventionally, an optical disk apparatus has an optical pickup (optical head) as the most basic configuration. This optical pickup includes at least an optical system such as a laser oscillator and an objective lens, a light receiving element, A two-axis actuator and the like are provided. The pickup can be moved in the radial direction of the optical disk by a so-called thread rail or a screw shaft and a thread motor.

In recent years, a plurality of types of optical disks have appeared, and these optical disks have various recording characteristics, reflection characteristics, layer structures, track widths, and the like. It is becoming impossible for only one laser beam to support these various optical disks.

[0004] Therefore, in order to be able to handle a plurality of types of optical disks in one optical disk device,
Various types of optical disk devices have been proposed which include two or more optical pickups or can emit two or more laser beams from one optical pickup.

[0005]

As described above, in the optical disk apparatus, the optical pickup is movable in the radial direction of the optical disk by a thread rail or a screw shaft and a thread motor as described above. For example, when the disk is moved from the innermost circumference to the outermost circumference or from the outermost circumference to the innermost circumference of the disc, a time in seconds is required as the moving time. Therefore, in the conventional optical disk device, for example, when recording or reproduction on the innermost circumference of the optical disk and recording or reproduction on the outermost circumference are continuously performed, a long time is required.

In a conventional optical disk device, for example, for two tracks on a single optical disk that are separated from each other, recording is performed on one track and reading is performed on the other track. There is no such optical disk device capable of simultaneous recording and reproduction. An optical disk device that generates two laser beams from one optical pickup and irradiates the two laser beams onto adjacent tracks to perform simultaneous recording and reproduction has already been proposed. There is no one capable of simultaneously recording and reproducing two tracks separated from each other, such as a track near the inner circumference and a track near the outermost circumference.

Further, in the conventional optical disk device,
For example, when verifying whether or not the recorded data is correctly recorded, the recorded data is reproduced, and the data at the time of recording is compared with the reproduced data. Usually, recording on one track is completed. After that, since the one track is reproduced and the data is collated, the verification of the recorded data requires a long time (twice as long as the case of only recording or reproduction).

Accordingly, the present invention has been made in view of such a situation, and for example, when the optical pickup is moved from the innermost circumference to the outermost circumference or from the outermost circumference to the innermost circumference of the disk, for example, Even in the case where recording or reproduction at the innermost circumference of the disc and recording or reproduction at the outermost circumference are continuously performed, short-time and smooth recording or reproduction can be performed. For two trucks that are far apart,
Simultaneous recording and reproduction, such as recording on one track and reading from the other track, is possible,
It is a further object of the present invention to provide an optical disk device that enables verification of recorded data in a short time.

[0009]

SUMMARY OF THE INVENTION An optical disk apparatus according to the present invention comprises: a rotation driving means for driving an optical disk to rotate; a plurality of optical heads; a moving means for independently moving each optical head in a radial direction of the optical disk; The above-described problem is solved by having a driving unit for operating each optical head independently, a signal processing unit for each optical head, and a control unit for controlling each of these units.

Here, the control means arranges the heads at equal intervals in the radial direction of the optical disk during standby before data recording or reproduction, and controls the light beam having the highest linear velocity when performing simultaneous recording or reproduction. The optical disk is driven to rotate in accordance with the head. Further, the control means selects an optical head to be used according to a recording or reproducing position on the optical disk. Further, the control means verifies the recorded data by reproducing the track immediately after recording with one optical head by another optical head.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a schematic configuration of an optical disk device according to an embodiment of the present invention.

In FIG. 1, an optical disk D is detachably mounted on a spindle motor 30 via a rotating shaft, and this spindle motor 30 is controlled by a driver 31 under a predetermined rotation speed under the control of a system controller 32. It is driven to rotate so that

The first optical pickup (optical head) P1 and the second optical pickup (optical head) P2 are optical pickups having the same configuration. Although not shown, a laser diode, a photodetector, an objective lens,
It is provided with basic components such as a shaft actuator. Further, the first optical pickup P1 and the second optical pickup P2 are optical pickups capable of not only reproducing data on the optical disc D but also recording data. There are various types of data recording / reproducing methods such as a magneto-optical type, a phase change type, and pit formation by heat, and the present invention can be applied to any of these types. Therefore, the optical disc device of the present embodiment includes:
Although a configuration (for example, a magnetic head or the like in the case of a magneto-optical type) corresponding to these various systems is provided, they are not shown in FIG.

The first optical pickup P1 is movable in the radial direction of the optical disk D by the rotation of a first sled screw shaft 15 which is driven to rotate by a first sled motor 11. Similarly, the second optical pickup P2 has a second thread screw shaft 25 that is rotationally driven by a second thread motor 21.
With the rotation of the optical disk D, the optical disk D can be moved in the radial direction.

The first sled motor 11 has a first
Is driven by the first driver 12 under the control of a DSP (Digital Signal Processor) 14
Is driven by the second driver 22 under the control of the second DSP 24.

As described above, in the optical disk device according to the present embodiment, the first optical pickup P1 includes the first thread motor 11 and the first thread screw shaft 1.
5, driven by the first driver 12 and the first DSP 14, and the second optical pickup P2 is driven by the second thread motor 21 and the second thread screw shaft 2.
5, the first and second optical pickups P driven by the second driver 22 and the second DSP 24.
1 and P2 are individually movable in the radial direction of the optical disc D.

FIG. 1 shows an example in which the first optical pickup P1 and the second optical pickup P2 are arranged 180 degrees with respect to the rotation center of the optical disk D. The present invention is not limited to this example, and the optical pickup may be arranged at any position as long as it does not hinder the operation and movement of each optical pickup and does not hinder the recording and reproduction of data by these optical pickups.

Further, the first driver 12 has a first D
Under the control of SP14, the laser diode and the biaxial actuator of the first pickup P1 are driven during data recording or reproduction, and the second driver 22 is also driven.
Drives the laser diode and the two-axis actuator of the second pickup P2 during data recording or reproduction under the control of the second DSP 24.

Reproduction RF from the first optical pickup P1
The signal is sent to the first DSP 1 via the first RF amplifier 13.
4 and reproduced RF from the second optical pickup P2
The signal is supplied to the second DSP 2 via the second RF amplifier 23.
4

The first DSP 14 generates a recording signal at the time of recording and controls the driving of the first driver 12 under control of the system controller 32, performs signal processing of a reproduction signal at the time of reproduction, and the first signal at the time of recording and reproduction. Performs tracking and focusing servo control of the optical pickup P1, and the second DSP 24 generates a recording signal at the time of recording, controls driving of the second driver 22, and reproduces the signal under the control of the system controller 32. , The tracking of the second optical pickup at the time of recording and reproduction, the servo control of focusing, and the like.

As described above, in the optical disk device of the present embodiment, the first driver 12 and the first RF amplifier 1 are used as a recording / reproducing structure in the first optical pickup P1.
3. A second optical pickup P including the first DSP 14
2 as a recording / reproducing configuration in the second driver 2
2, the provision of the second RF amplifier 23 and the second DSP 24 makes it possible to record or reproduce data separately in each optical pickup.

Under the control of the system controller 32, the cache memory 33 stores the first DSP 14 and the second
It temporarily stores the recording data supplied to the SP 14, and stores the first DSP 14 and the second DSP 24
This temporarily stores the reproduction data supplied from.

The switch 34 is connected to the system controller 3
Under the control of 2, the input data (recording data) supplied to the data input terminal 35 is sent to the cache memory 33,
Data switching selection is performed such that output data (reproduction data) supplied from the cache memory 33 is sent to the data output terminal 36.

As shown in FIG. 1 described above, the optical disk device according to the present embodiment includes first and second two optical pickups P.
1 and P2, these two optical pickups can be individually moved, and can be individually recorded and reproduced.

Here, the system controller 32 of the optical disk device of the present embodiment controls the movement and the recording / reproducing operation of the optical pickups P1 and P2 as follows, for example, to perform data recording and data reproduction. Efficient operations can be realized during standby before performing, during simultaneous recording and reproduction for tracks at different positions on the optical disc D, during recording or reproduction of permutation data, and during verification of recorded data. The description will be made in the following order. In the following description, MI is the innermost circumference of the optical disc D, MO is the outermost circumference, DC is the center of rotation of the disk, and B is the distance from the innermost circumference MI to the outermost circumference MO.

First, the operation during standby before data recording or data reproduction is performed will be described.

During standby before data recording or data reproduction, the system controller 32 controls the arrangement of the first optical pickup P1 and the second optical pickup P2 with respect to the optical disc D so as to be at a predetermined standby position. I do.

That is, the system controller 32
By controlling the first and second drivers 12 and 22 via the first and second DSPs 14 and 24 to drive the first and second thread motors 11 and 21, the first and second optical pickups P1 and P21 are driven. The arrangement of the second optical pickup P2 with respect to the optical disk D is controlled so as to be at the standby position shown in FIG.

More specifically, during standby before data recording or data reproduction is performed, for example, the first optical pickup P1 is moved from the innermost circumference MI of the optical disc D by a distance of B / 4 as shown in FIG. And the second optical pickup P2 is arranged at a distance of 3B / 4 from the innermost circumference MI of the optical disc D. In other words, the distance from the innermost circumference MI of the optical disc D to the position at which the first optical pickup P1 is arranged;
The distance from the arrangement position of the first optical pickup P1 to the arrangement position of the second optical pickup P2 is １ ／, and the distance from the arrangement position of the second optical pickup P2 to the outermost periphery MO of the optical disk D is respectively The first and second optical pickups P1 and P2 are arranged so as to be the same.

If the first optical pickup P1 and the second optical pickup P2 are arranged as shown in FIG. 2 during standby before data recording or data reproduction is performed, the position from the standby state will be determined later. First and second optical pickups P
When moving P1 and P2, these first and second
Of the optical pickups P1 and P2 can be minimized.

FIG. 3 is a flowchart showing the operation of the system controller 32 during the standby state.

In FIG. 3, when a standby command is issued in step S1, in step S2, the first optical pickup P1 is moved from the innermost circumference MI of the optical disc D by 1 / (the distance B).
4, and the second optical pickup P2 is placed at a position 3/4 of the distance B from the innermost circumference MI of the optical disk D, and the standby state is established.

Next, the operation at the time of simultaneous recording and reproduction on tracks at different positions on the optical disk D will be described.

At the time of simultaneous recording and reproduction on tracks at different positions on the optical disk D, the system controller 32 determines the rotational speed of the spindle motor 30 (corresponding to the positions of the first and second optical pickups P1 and P2). Disk rotation speed).

That is, at the time of simultaneous recording / reproducing on tracks at different positions, the disk rotation speed is adjusted in accordance with the linear speed of the one of the first and second optical pickups P1 and P2 that is farther from the disk rotation center DC. Control. For example, when performing simultaneous recording and reproduction after the standby state as shown in FIG. 2, the second optical pickup P2 is farther from the disk rotation center DC than the first optical pickup P1. The disk rotation speed is controlled in accordance with the linear speed of the second optical pickup P2.

FIG. 4 shows an operation flowchart of the system controller 32 at the time of simultaneous recording and reproduction on tracks at different positions on the optical disk D.

In FIG. 4, when a simultaneous recording / reproducing command is issued in step S11, in step S12, the system controller 32 synchronizes with the linear velocity for the optical pickup having the maximum linear velocity during the simultaneous recording / reproducing. Then, the disk rotation speed of the optical disk D is controlled.

In the next step S13, data is recorded or reproduced on a certain track by the first optical pickup P1, and data is recorded or reproduced on another track by the second optical pickup P2.

Thereafter, in step S14, it is determined whether or not recording or reproduction has been completed. If not completed, the process returns to step S13, while if completed, the process ends. The determination in step S14 can be made for each of the first optical pickup P1 and the second optical pickup P2. That is, for example, when only the recording or reproduction of one optical pickup is completed, the recording or reproduction operation of the one optical pickup is terminated, but for the optical pickup of which the other recording or reproduction is not completed, step S1 is performed.
An operation to return to the process of step 3 is performed.

Next, the operation of sequentially recording or reproducing data, that is, the operation of sequentially recording or reproducing data by the first and second optical pickups P1 and P2 will be described.

At the time of recording or reproducing the permuted data, the system controller 32 controls so as to record or reproduce data by using the optical pickup closest to the track on which recording or reproduction is to be performed. Alternatively, when the optical pickup performing reproduction is to perform recording or reproduction beyond a predetermined position on the optical disk D, the optical pickup with the smallest moving amount is selected from these two optical pickups. Control to use.

That is, taking the pickup arrangement of FIG. 5 as an example, when a track to be recorded or reproduced on the optical disc D is at a distance A from the innermost circumference MI, the track at the position of the distance A is the most The recording or reproduction is started by selecting the near first optical pickup P1, and thereafter,
The first optical pickup P1 is positioned at a predetermined position on the optical disk D (for example, a position B / 2, which is a half of the innermost circumference to the outermost circumference).
When recording or reproduction is to be performed beyond the range, recording or reproduction is performed by the second optical pickup P2.

An operation flowchart of the system controller 32 at the time of recording or reproducing the permutation data is shown in FIG.
The flowchart of FIG. 6 will be described with reference to FIG.

In FIG. 6, when an instruction to sequentially record or reproduce data is made in step S21, step S2 is executed.
In 2, the system controller 32 selects the optical pickup closest to the track to be recorded or reproduced and starts recording or reproduction. In the example of FIG. 5, this step S22
, The first optical pickup P1 is selected. After step S22, the process proceeds to step S23. If the second optical pickup P2 is closest to the track to be recorded or reproduced, step S22
In step S2, the second optical pickup P2 is selected.
The process will proceed to step 26.

In step S23 when the first optical pickup P1 is selected in step S22, the first optical pickup P1 is selected.
The recording or reproduction of the track is performed by the optical pickup P1. On the other hand, the second optical pickup P2 waits at a position of 2 (BA) / 3 from the innermost circumference MI of the optical disc D.

In the next step S23, it is determined whether or not data recording or reproduction by the first optical pickup P1 has been completed.
If not completed, the process proceeds to step S25.

In step S25, the current position (the distance A 'from the innermost circumference) of the first optical pickup P1 is half (B) the distance B from the innermost circumference MI to the outermost circumference MO of the optical disc D.
/ 2) It is determined whether or not (A '> B / 2). In this determination, if it is determined that the first optical pickup P1 has not reached the distance B / 2 or more, the process returns to step S23, while the first optical pickup P1 has not reached the distance B / 2 or more. If it is determined that it has come, the process proceeds to step S26.

In this step S26, the above-mentioned track is recorded or reproduced by the second optical pickup P2. On the other hand, the first optical pickup P1 is shifted from the innermost circumference MI of the optical disk D to (BA). Wait at the position of / 3.

In the next step S27, it is determined whether or not data recording or reproduction by the second optical pickup P2 has been completed.
If not, the process proceeds to step S28.

In step S28, the current position (the distance A 'from the innermost circumference) of the second optical pickup P2 is a half (B) of the distance B from the innermost circumference MI to the outermost circumference MO of the optical disk D.
/ A) (A '<B / 2). In this determination, when it is determined that the second optical pickup P2 is not within the distance B / 2, the process returns to the step S26, while the second optical pickup P2 is within the distance B / 2. If it is determined that it has come, the process returns to step S23.

By performing the control as shown in FIGS. 5 and 6 described above, in the optical disk device of the present embodiment, it is possible to minimize the amount of movement of the first and second optical pickups P1 and P2. It becomes possible.

Next, the operation at the time of verifying the recording data will be described.

At the time of verifying the recording data, the system controller 32 controls the optical pickup so that the recording is performed by one optical pickup and the data reproduction of the track immediately after the recording is performed by the other optical pickup. Verify whether the data was recorded normally.

That is, as shown in FIG. 7, for example, when recording is performed by the first optical pickup P1, the system controller 32 controls the second optical pickup P1 immediately after the recording by the first optical pickup P1. On the track (distance C from the innermost circumference MI of the disk), read the data recorded on the track by the second optical pickup P2, and compare the recorded data with the reproduced data. Verify that the recording was performed correctly.

FIG. 8 shows an operation flowchart of the system controller 32 when verifying the recording data.

In FIG. 8, when a command to verify the recording data is issued in step S31, in step S32,
The system controller 32 arranges both the first and second optical pickups P1 and P2 on a track on which recording is performed.

In the next step S33, data is recorded by, for example, the first optical pickup P1, and data recorded by the first optical pickup P1 is reproduced by the second optical pickup P2.

Thereafter, in step S34, the data recorded by the first optical pickup P1 is collated with the data reproduced by the second optical pickup P2, and as a result of the collation, the data is correctly recorded. Is determined. If it is determined that the data has not been correctly recorded by this collation, the process returns to step S33 to record the data again. On the other hand, if it is determined that the data has been correctly recorded by the comparison in step S34, the process proceeds to step S35.

In step S35, it is determined whether or not data recording on the track has been completed. If completed, the process ends.
Proceed to 36.

In step S36, the system controller 32 causes both the first and second optical pickups P1 and P2 to jump to the track on which recording is to be performed next. Thereafter, the process returns to step S33, and the process returns to step S33. The processing after S33 is performed.

As described above, in the optical disk device of the present embodiment, the first and second optical pickups P1,
As shown in P2, two optical pickups are provided, the arrangement position of each optical pickup is optimized, and the movement amount of each optical pickup in the track direction is reduced to 1/3 or less. It is possible to increase the speed of random access. That is, in particular, the optical pickup does not jump from the innermost circumference MI to the outermost circumference MO on the optical disk D, and the speed of random access can be increased.

In the optical disk device of this embodiment, the first and second optical pickups P1 and P2 are individually movable and operable, so that different tracks on one optical disk D can be used. This allows simultaneous recording and playback.

Further, in the optical disk device of the present embodiment, the first and second optical pickups P1 and P2 are individually movable and operable, and the data immediately after recording by one optical pickup is transferred to the other. Since the data can be reproduced by the optical pickup, it is possible to verify the recorded data in a short time.

In the above embodiment, two optical pickups are provided, and these two optical pickups are made movable and operable. However, the number of optical pickups is not limited to two. Further, it is also possible to provide a plurality of optical pickups so that the plurality of optical pickups can be moved and operated.

[0066]

As apparent from the above description, the present invention has a plurality of optical heads, means for independently moving and driving each of the optical heads, and control means for them. For example, the optical pickup does not move from the innermost circumference to the outermost circumference or from the outermost circumference to the innermost circumference, enabling short-time and smooth recording or reproduction. Simultaneous recording and reproduction can be performed such that recording is performed on one track and reading is performed on the other track with respect to two tracks that are distant from each other. Can be done.

[Brief description of the drawings]

FIG. 1 is a block circuit diagram showing a schematic configuration of an optical disk device according to an embodiment of the present invention.

FIG. 2 is a diagram used to describe an arrangement state of first and second optical pickups in a standby state before performing data recording and data reproduction.

FIG. 3 is a flowchart used to describe a control operation of a system controller in a standby state before performing data recording or data reproduction.

FIG. 4 is a flowchart used to explain a control operation of a system controller at the time of simultaneous recording and reproduction on tracks at different positions on an optical disc.

FIG. 5 is a diagram used to describe an arrangement state of first and second optical pickups when recording or reproducing permutation data.

FIG. 6 is a flowchart used to explain a control operation of a system controller when recording or reproducing permutation data.

FIG. 7 is a diagram used to explain a moving state of first and second optical pickups at the time of verifying recording data.

FIG. 8 is a flowchart used to explain a control operation of a system controller when verifying print data.

[Explanation of symbols]

11 1st thread motor, 12 1st driver, 13 1st RF amplifier, 14 1st DS
P, 15 1st thread screw shaft, 21
A second thread motor, 22 a second driver,
23 2nd RF amplifier, 24 2nd DSP, 2
5 second thread screw shaft, 30 spindle motor, 31 driver, 32 system controller, 33 cache memory, 34 switch, 35 data input terminal, 36 data output terminal,
D optical disk, P1 first optical pickup, P
2 Second optical pickup

Claims (5)

[Claims] 1. A rotation driving means for rotating and driving an optical disk; a plurality of optical heads; a moving means for independently moving the plurality of optical heads in a radial direction of the optical disk; Driving means for operating; signal processing means for the plurality of optical heads; and control means for controlling the plurality of optical heads, the moving means, the driving means, the signal processing means, and the rotation driving means. An optical disc device characterized by the above-mentioned. 2. The control means controls the moving means in a standby state before recording or reproducing data.
2. The optical disk device according to claim 1, wherein the plurality of heads are arranged at equal intervals in a radial direction of the optical disk. 3. The control unit controls the rotation driving unit to rotate the optical disc in accordance with an optical head having the highest linear velocity when performing simultaneous recording or reproduction with the plurality of optical heads. The optical disk device according to claim 1, wherein the optical disk device is controlled. 4. An optical head which performs control to record or reproduce data by using an optical head closest to a track on which recording or reproduction is to be performed, and performs current recording or reproduction. However, when recording or reproduction is performed beyond a predetermined position on the optical disc, control is performed such that an optical head with the smallest moving amount is selected and used among other optical heads. Claim 1
An optical disk device as described in the above. 5. The apparatus according to claim 1, wherein said control means reproduces a track immediately after recording by one optical head by another optical head to verify recorded data. Optical disk device.