JPH11328688A - Optical disk device and data reproduction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical disk device and a data reproduction method for reducing time up to the start of data read after moving an optical pickup to a target position. SOLUTION: In the movement of a plurality of optical pickups and the control of data read, the data read is started from a position where address information is firstly obtained even when the optical pickups other than that for moving to the start position of data where there is a read request deviate from the target movement position of each optical pickup, and at the same time the read end address of the optical pickup for taking the charge of a data region immediately before corresponding to an actual read start address is adjusted, thus preventing the lack and duplication of data, reducing time required for rotation standby and removement of the optical pickup, and reducing time up to the start of data read.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk device which is connected to a computer or the like and records / reproduces data using light, and a data reproducing method in the device.

[0002]

2. Description of the Related Art In recent years, an optical disk device has played an important role as a basic product of multimedia, and especially a CD.
-ROM drive devices have become indispensable as personal computer related peripheral devices. Furthermore, as a next-generation optical disk device, a D-ROM that reproduces data using a DVD-ROM having a significantly increased storage capacity compared to a CD-ROM is used.
VD-ROM drive devices have been developed.

[0003] An example of such a conventional optical disk device is as follows.
This will be described with reference to FIG. FIG. 1 is a configuration diagram of the present invention and a conventional optical disk device. Here, a system having two optical pickups will be described.

[0004] In FIG. 1, an optical disk apparatus includes a spindle motor 102 which rotates by mounting a disk 101 on which information signals are recorded, and two optical pickups 10.
3, 123. This optical pickup 103, 2
Reference numeral 03 denotes an objective lens for condensing a laser beam on the recording surface of the disk, a focus actuator for moving the laser beam in a direction perpendicular to the surface of the disk (hereinafter referred to as a focus direction), and a radial direction of the disk (hereinafter referred to as a tracking direction). ), And various prisms including a semiconductor laser, detectors for signal detection, and the like are integrally formed. Optical pickup 1
RF signal detectors 104 and 124 for generating analog RF signals and servo signals from the respective outputs of signals 03 and 123; RF signal slicers 105 and 125 for generating digital RF signals (data signals) from analog RF signals; PLL (Phase Locked Loop) circuits 106 and 126 for synchronizing the respective outputs of the 105 and 125 and demodulate the data of the respective outputs of the RF signal slicers 105 and 125 using the respective outputs of the PLL circuits 106 and 126 Demodulators 107 and 127 for performing servo control based on the detected servo signals, and servo controllers 108 and 128 configured in, for example, a digital format.
Actuator drivers 109 and 129 that drive a focus actuator and a track actuator based on the outputs of the servo controllers 108 and 128, tracking of a movable range that cannot be handled by the optical pickups 103 and 123, and large movement between tracks ( Thread motors 110 and 130 used for the access operation),
Sled motor drivers 111 and 131 for driving the sled motors 110 and 130 based on the outputs of the servo controllers 108 and 128, and servo controller outputs (108 and 12).
8), and a spindle motor driving signal generator 112 for generating a signal of a predetermined level based on the output of the spindle motor driving signal generator 112.
13, an interface circuit 114 for collectively sending data from the demodulators 107 and 127 to the host computer 115, a buffer memory 116 for temporarily storing data from the demodulators 107 and 127, and a host computer 115. The CPU 117 which interprets the control command from the CPU (via the interface circuit 114) and issues an instruction to the servo control units 108 and 128;
And a program 118 running on the PU 117.

Control means (hereinafter referred to as CPU) for controlling the optical pickups 103 and 123 when a host computer 115 issues a data read command to the optical disk device.
Moves one optical pickup 103 to the position where the requested data is located, reads out data for a predetermined reproduction unit corresponding to a predetermined data amount, and moves the other optical pickup 123 to a predetermined position. The data is moved to the position where the data exists at the rear by an integral multiple of the reproduction unit, and the data is read from this position. This is called read-ahead cache control, and is conventionally used as a technique for responding at high speed to a continuous data read request.

When the optical pickup is moved to a target data position using such a prefetch cache control,
FIG. 5 shows a sequence in a conventional optical disk device.
This will be described with reference to FIG.

FIG. 4 is a view showing the movement position of the optical pickup of the present invention and the conventional optical disk drive, FIG. 5 is a flowchart of the reproducing operation of the conventional optical disk drive, and FIG. 6 is a seek operation diagram of the optical pickup of FIG.

In FIG. 5, the optical pickup 123 is C
A data read start address and a read end address of the movement target are given from the PU 117 (step 501).
The movement by the seek operation is performed toward the movement target position. After the movement, the optical pickup 123 performs tracking servo to read data (step 502). The synchronization signal included in the read data is captured, and a break in each data unit (called a sector) is recognized (step 503). Then, the address information (m) stored at the head of each sector is read (step 504) and compared with the data read start address (n1) of the movement target (step 505), and the following processing is performed.

(1) When m = n1 (FIG. 6, Example 1): Since the position of the optical pickup 123 has reached the data reading start address of the movement target, data reading is started (step 506).

(2) In the case of m ≦ n1−α (FIGS. 4 and 6, example 2): (α is a positive integer and is slightly larger than the number of sectors per round of a spiral-structured disk) Since it is not far from the address of the movement target as it is moved again, it stands by (step 50).
7) The above-mentioned processing is performed again (steps 504 to 50).
5).

(3) When m <n1-α (FIGS. 4, 6 and Example 3): Moving the optical pickup 123 again is more effective than moving the optical pickup 123 in a standby state as in the case of Example 2 described above. Since the address can be reached earlier, the optical pickup 12
3 is moved (step 508), and the same processing is performed (steps 503 to 505).

(4) When m> n1 (FIGS. 4, 6 and Example 4): Since the optical pickup 123 has passed the position of the movement target, the optical pickup 123 is moved again (step 508), and the same processing is performed. (Step 50)
3-505).

After the above-described comparison judgment processing, when data reading is started (step 506), the data reading is performed and the address extraction is continuously performed (step 50).
9), the position (m) of the optical pickup 123 is
7, the data read end address (n
It is determined whether or not 2) has been reached (step 510). After confirming that the data read end address has been reached, the read is terminated (step 511), and the read end is notified to the CPU 117 (step 512). Of the information (step 513), and the above sequence (steps 501 to 513) is repeated.

[0014]

However, the above-mentioned conventional configuration has the following problems. As described above, in Example 1, data can be read immediately after the movement of the optical pickup. However, in a conventional system having two optical pickups 103 and 123, the read area allocation of each optical pickup 103 and 123 is predetermined. The first optical pickup 10
In the other optical pickup 123, which reads out data that is an integral multiple of a predetermined reproduction unit of the data to be read out, the standby time (rotational waiting time) up to the moving target address as in Example 2 Occurs, and Example 3,
As shown in FIG. 4, time is required for re-moving the optical pickup and re-establishing synchronization (see FIG. 6).
3. It takes a long time from when synchronization is first established to when data reading actually starts, and a high-speed response to a continuous data reading request is performed despite prefetch cache control. Had become difficult.

[0015] The time from moving the optical pickup to a target position for data reading until the start of data reading is reduced without causing data loss or duplication, and the number of times the optical pickup is moved is reduced. Accordingly, it is an object of the present invention to provide an optical disk device and a data reproducing method that achieve low current consumption.

[0016]

In order to achieve the above object, an optical disk apparatus and a data reproducing method according to the present invention are provided.
An optical disc device having a plurality of optical pickups capable of independently controlling the position and controlling the reproduction operation, and control means for controlling the movement of the optical pickup and controlling the operation of the entire apparatus, wherein the control means is a predetermined one. The optical pickup moves the mutual reproduction area of each optical pickup so that the optical pickup shares the storage area of the optical disc for each predetermined reproduction unit corresponding to the reproduced data amount, and the reproduction start position corresponding to one optical pickup corresponds to the reproduction request. To reproduce the data, and correct the reproduction end position of the other optical pickup from the position of the predetermined reproduction unit to the reproduction start position of one optical pickup, and reproduce the data. The reproduction start position of one optical pickup is controlled so as to constitute a series of reproduction data including a reproduction required capacity. Than it is.

As described above, it is possible to shorten the time until the start of data reading after the movement of the optical pickup without causing loss or duplication of data, to respond to a data request from the host computer at a high speed, and to realize the optical pickup. By reducing the number of times of movement, an excellent effect of reducing current consumption can be obtained.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The inventions according to claims 1 and 3 of the present invention provide a plurality of optical pickups capable of independently controlling a position and controlling a reproducing operation, a movement control of the optical pickup, and an operation of the whole apparatus. An optical pickup device having control means for controlling each of the optical pickups such that the optical pickups share the storage area of the optical disc for each predetermined reproduction unit corresponding to a predetermined reproduction data amount. The mutual reproduction area is moved, one optical pickup is moved to a reproduction start position corresponding to a reproduction request to reproduce data, and the reproduction end position of the other optical pickup is shifted by one light from a predetermined reproduction unit position. The playback is corrected to the playback start position of the pickup, and the playback end position of the other optical pickup and the playback start position of one optical pickup include the required playback capacity. An optical disk apparatus and a data reproducing method being characterized in that controlled so as to form a series of reproduced data.

As described above, it is possible to shorten the time from the movement of the optical pickup to the start of data reading without causing data loss or duplication, to respond to a data request from the host computer at a high speed, and to realize the optical pickup. By reducing the number of times of movement, an excellent effect of reducing current consumption can be obtained.

The second and fourth aspects of the present invention include a plurality of optical pickups capable of independently controlling the position and the reproducing operation, and control means for controlling the movement of the optical pickup and controlling the operation of the entire apparatus. An optical disk device, wherein the control means moves a mutual reproduction area of each optical pickup so that the optical pickup shares a storage area of the optical disk for each predetermined reproduction unit corresponding to a predetermined reproduction data amount, When data is reproduced by moving one optical pickup to a reproduction start position corresponding to the reproduction request, the reproduction start position is separated from the reproduction request position beyond a predetermined position determined by the capacity of the buffer memory of the device itself. In this case, one optical pickup is moved to the reproduction start position again to reproduce the data, and the reproduction end position of the other optical pickup is determined. From the position of the reproduction unit to the reproduction start position of one optical pickup and reproduce the data.The reproduction end position of the other optical pickup and the reproduction start position of the one optical pickup form a series of reproduction data including the required reproduction capacity. An optical disc device and a data reproducing method characterized by being controlled to configure.

As described above, in addition to the effects of the first and third aspects, the reproduction start position is allowed to fluctuate to an allowable range determined by the capacity of the memory of the apparatus itself. The time until the start of data reading after the movement of the optical pickup can be shortened without causing duplication.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. (Embodiment) FIG. 1 is a configuration diagram of the present invention and a conventional optical disk device. The optical disc device according to the present embodiment includes a disc 101, a spindle motor 102,
Optical pickups 103 and 123 and RF signal detector 10
4, 124; RF signal slicers 105, 125;
LL circuits 106 and 126, demodulators 107 and 127,
Servo controllers 108 and 128, actuator drivers 109 and 129, thread motors 110 and 130,
The configuration includes thread motor drivers 111 and 131, a spindle motor drive signal generator 112, a spindle motor driver 113, an interface circuit 114, a buffer memory 116, a CPU 117, and a program 118. The above circuit block configuration is the same as that of the conventional optical disk device, and the same reference numerals are given to omit redundant description. Hereinafter, the data reproduction process stored in the program 118, which is a feature of the present invention, which is a difference from the related art, will be described.

FIG. 2 is a flowchart of a reproducing operation of the optical disk device according to the embodiment of the present invention, FIG. 3 is a seek operation diagram of the optical pickup of FIG. 2, and FIG. 4 is a moving position of the optical pickup of the present invention and the conventional optical disk device. FIG. The optical pickup 123 is a CPU 11 serving as a control unit.
7, the data read start address and the read end address of the movement target are given (step 201), and the movement by the seek operation is performed to the movement target position. Optical pickup 1
After the movement, the tracking servo is performed to read data (step 202). The synchronization signal included in the read data is captured, and a break of each data unit (sector) is recognized (step 203). Further, the address information (m) stored at the head of each sector is read (step 204) and compared with the data read start address (n1) of the movement target (step 20).
5) The following processing is performed.

(1) When n1−β ≦ m ≦ n1 + β (β
Is a positive integer, and the value depends on the capacity of the buffer memory and the file size read in one read request. ): The position of the optical pickup is located near the data read start address of the movement target. At this time, data reading is started as it is, even if it is not the data reading start address of the movement target (step 206).

However, as it is, there is a mismatch with the read area of the optical pickup 103 which is in charge of the area immediately before the currently controlled optical pickup 123. That is, when reading is started from an address before the address of the movement target (see FIG. 3, Example 2), duplication of read data occurs, and when reading is started from an address after the address of the movement target (FIG. 3). , See Example 4), data will be lost.

Therefore, when data reading is started, the address at which reading has actually started is notified to the CPU 117 (step 207). By changing the position information of the read end address and notifying the servo controller 108 that performs the servo control of the optical pickup 103 (step 211), it is possible to prevent the read data from being duplicated or missing.

(2) When m <n1−β, m> n1 + β (FIG. 3, Example 3): Since the address is far from the target address, moving the optical pickup again makes data more efficient. Is read, the optical pickup is moved again (step 208), and the same processing is performed (steps 203 to 205).

After the comparison and judgment processing, when data reading is started (step 206), data reading is performed and address extraction is continued at the same time (step 20).
9) The position (m) of the optical pickup 103 is
7, the data read end address (n
It is determined whether or not 2) has been reached (step 210). After confirming that the end position has been reached, the reading is terminated (step 212), the CPU 117 is notified of the end of reading (step 213), and the next reading is performed. Is received (step 214), and the above sequence (steps 201 to 214) is repeated.

Here, the value of β depends on the capacity of the buffer memory and the file size as described above. further,
As described in the present embodiment, when the number of optical pickups is more than two and three or more, the effects of the above-mentioned buffer memory capacity and file size are different. Also,
As shown in FIG. 4, the tracks are arranged in a spiral, so that reading can be performed faster by jumping one track than by providing a buffer memory corresponding to one rotation of the disk and waiting for the rotation. Therefore, the value of β is determined in consideration of the above conditions.

As described above, the optical disk device according to the present embodiment, when the position where the address information after the seek operation of the optical pickup 123 is first obtained is within a predetermined deviation range from the address of the movement target, The data reading of the optical pickup 123 is started directly from the position where the address information is first obtained, and the read end address of the optical pickup 103 in charge of the immediately preceding data area is adjusted in accordance with the actual read start address. The optical pickup 12 based on the look-ahead cache control eliminates the rotation waiting time and the time required for re-moving the optical pickup 123 without causing data loss or duplication.
3, the time until the start of data reading can be greatly reduced, and a high-speed response to a continuous data reading request can be ensured.

In the above description, the case where the number of the optical pickups is two is described.
3 has been mainly described. However, the optical pickup 1 arranged ahead of the position of the read start address described above.
It is obvious that the expression at the center of the position 03 is the expression of the position of the read end address. Therefore, the explanation will not be repeated by exchanging the expression.

Similarly, when there are three or more optical pickups, the position of the read start address and the position of the read end address are combined especially for the optical head that shares the central reproduction area. This is also self-explanatory, and redundant explanations are omitted to avoid complicating expressions unnecessarily.

[0033]

Conventionally, when a plurality of optical pickups are provided, their mutual intervals are kept constant at a predetermined interval reproduction unit.

As described above, according to the present invention, in a disk device having a plurality of optical pickups, even if the optical pickup to be moved to the head position of the data requested to be read is slightly deviated from the movement target position, the address information is transferred. Data reading is started from the first obtained position, and the reading end address of another optical pickup that is in charge of the immediately preceding data area is adjusted in accordance with the actual reading start address. As a result, it is possible to shorten the time until the start of data reading after the movement of the optical pickup without causing loss or duplication of data, to respond quickly to a data request from the host computer, and to perform the number of movements of the optical pickup. Can be reduced, and an advantageous effect of reducing current consumption can be obtained.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of the present invention and a conventional optical disk device.

FIG. 2 is a flowchart of a reproducing operation of the optical disc device according to the embodiment of the present invention;

FIG. 3 is a seek operation diagram of the optical pickup of FIG. 2;

FIG. 4 is a view showing a moving position of an optical pickup of the present invention and a conventional optical disk device.

FIG. 5 is a flowchart of a reproducing operation of a conventional optical disk device.

FIG. 6 is a diagram illustrating a seek operation of the optical pickup of FIG. 5;

[Explanation of symbols]

 101 Disk 102 Spindle motor 103, 123 Optical pickup 104, 124 RF signal detector 105, 125 RF signal slicer 106, 126 PLL circuit 107, 127 Demodulator 108, 128 Servo controller 109, 129 Actuator driver 110, 130 Thread motor 111, 131 Thread motor driver 112 Spindle motor drive signal generator 113 Spindle motor driver 114 Interface circuit 115 Buffer memory 116 Host computer 117 CPU 118 Program

Claims (4)

[Claims] 1. An optical disc apparatus comprising: a plurality of optical pickups capable of independently controlling a position and a reproducing operation; and control means for controlling movement of the optical pickup and controlling the operation of the entire apparatus. Means for moving the mutual reproduction areas of the optical pickups so that the optical pickups share the storage area of the optical disc for each predetermined reproduction unit corresponding to a predetermined reproduction data amount; Is moved to the reproduction start position corresponding to the reproduction request to reproduce the data, and the reproduction end position of the other optical pickup is corrected from the position of the predetermined reproduction unit to the reproduction start position of the one optical pickup. The reproduction is performed, and the reproduction end position of the other optical pickup and the reproduction start position of the one optical pickup include a required reproduction capacity. An optical disc device controlled to form a series of reproduction data. 2. An optical disk device comprising: a plurality of optical pickups capable of independently controlling a position and a reproducing operation; and control means for controlling movement of the optical pickup and controlling operation of the entire apparatus. Means for moving the mutual reproduction areas of the optical pickups so that the optical pickups share the storage area of the optical disc for each predetermined reproduction unit corresponding to a predetermined reproduction data amount; Is moved to the reproduction start position corresponding to the reproduction request, and when the data is reproduced, if the reproduction start position exceeds a predetermined position determined from the capacity of the buffer memory of the apparatus itself and is separated from the reproduction request position, Moving the one optical pickup to the reproduction start position to reproduce the data, and ending the reproduction of the other optical pickup. The position is corrected from the position of the predetermined reproduction unit to the reproduction start position of the one optical pickup and reproduced, and the reproduction end position of the other optical pickup and the reproduction start position of the one optical pickup are An optical disc device characterized in that it is controlled so as to form a series of reproduction data including a required reproduction capacity. 3. A data reproducing method for an optical disk device having a plurality of optical pickups capable of independently controlling a position and controlling a reproducing operation, wherein the method comprises the steps of: A sharing movement step in which the optical pickups move a mutual reproduction area of the optical pickups so as to share a storage area of an optical disc; and moving one of the optical pickups to a reproduction start position corresponding to a reproduction request to transfer data. A reproduction start step of reproducing, and an end position correction step of correcting the reproduction end position of the other optical pickup from the position of the predetermined reproduction unit to the reproduction start position of the one optical pickup and reproducing. The reproduction result of the other optical pickup in the end position correction step and the one optical pickup in the reproduction start step A data reproduction method for an optical disk device, characterized in that the reproduction result of a backup is controlled so as to form a series of reproduction data including a required reproduction capacity. 4. A data reproducing method for an optical disk device having a plurality of optical pickups capable of independently controlling a position and controlling a reproducing operation, wherein the method comprises the steps of: A sharing movement step in which the optical pickups move a mutual reproduction area of the optical pickups so as to share a storage area of an optical disc; and moving one of the optical pickups to a reproduction start position corresponding to a reproduction request to transfer data. A reproduction start step for reproducing; and if the reproduction start position is separated from the reproduction request position beyond a predetermined position determined by the capacity of the buffer memory of the device itself, the one optical pickup is moved to the reproduction start position again. A seek step of moving; and a reproduction end position of another optical pickup from the position of the predetermined reproduction unit. An end position correcting step of correcting the optical pickup to the reproduction start position and reproducing the optical pickup. The reproduction result of the other optical pickup by the end position correcting step and the reproduction of the one optical pickup by the reproduction start step A data reproducing method for an optical disk device, wherein the result is controlled so as to form a series of reproduction data including a required reproduction capacity.