JP2000090551A - Optical disk device and data reproduction thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To attain the high speed seeking by controlling the length of data region shared to each optical pickup to the length eliminating the simultaneous jump seeking of the plural optical pickups, while preventing the data regions shared to each optical pickup from overlapping. SOLUTION: When the read of data is requested by a host computer 14, the seeking is made by the 1st optical pickup 3-1 to the leading position of the data region where the read is requested, and the read of the data is started after the seeking is completed. By the 2nd optical pickup 3-2, the seeking is made to the backward position by the amount of the size of the requested read from the read position of the 1st pickup 3-1. In the time during the data are being read out by the subsequent 2nd optical pickup 3-2, the read of the data is completed by the 1st optical pickup 3-1. When the capacity of a buffer memory 17 is confirmed and it is not filled up yet, the seeking is made to the back of the 2nd optical pickup 3-2, and the read of the data is continued.

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 which is connected to a computer or the like and records / reproduces data using light, and a data reproducing method therefor.

[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. Further, as a next-generation optical disk device, a DVD-ROM drive device has been developed in which the storage capacity is greatly improved compared to a CD-ROM.

On the other hand, the arithmetic processing speed of a computer that controls an optical disk device is increasing year by year. With the increase in capacity and speed of optical disks, there is a demand for an optical disk device that can read stored information in a short time.

FIG. 12 is a device block diagram of a conventional optical disk device having two optical pickups. In FIG. 12, reference numeral 1 denotes an optical disk on which an information signal is recorded;
Is a spindle motor for loading and rotating an optical disc, 3
Reference numerals -1 and 3-2 denote optical pickups that detect information recorded on the optical disk by light and convert the information into electric signals. The optical pickups 3-1 and 3-2 are an objective lens for condensing a laser beam on the recording surface of the optical disk, a focus actuator for moving the objective lens in a direction perpendicular to the surface of the optical disk (hereinafter, referred to as a focus direction), A track actuator for moving the optical disk in a radial direction (hereinafter, referred to as a tracking direction), various prisms including a semiconductor laser, a signal detection detector, and the like are integrally formed.

4-1 and 4-2 are optical pickups 3-1;
An RF signal detector 5-1 and 5-2 for generating an analog RF signal or a servo signal from the output of 3-2 is an R signal generator for generating a digital RF signal (data signal) from the analog RF signal.
F signal slicer 6-1 and 6-2 are RF signal slicers 5
PLL for synchronizing the output of -1, 5-2
(Phase Locked Loop) circuit, 7-
Decoders 1 and 7-2 decode the data output from the RF slicers 5-1 and 5-2 using the outputs of the PLL circuits 6-1 and 6-2, and 8-1 and 8-2 detect RF signals. Vessels 4-1 and 4-
2. Servo controllers (for example, formed in digital form) that perform servo control based on the servo signals detected in step 2, and 9-1 and 9-2 are servo controllers 8-1 and 8-2.
Actuators 10-1 and 10-2 for driving the focus actuators and track actuators of the optical pickups 3-1 and 3-2 based on the outputs of the servo controllers 8-1 and 8-2. A thread driver for driving a thread motor; 11 is a servo controller;
1, a spindle motor drive signal generator for generating a signal of a predetermined level based on the output of the spindle motor drive signal generator 12 for driving the spindle motor 2 based on the output of the spindle motor drive signal generator 11; Reference numeral 13 denotes an interface circuit for collectively sending data of the decoders 7-1 and 7-2 to the host computer 14, and reference numeral 15 interprets a control command from the host computer (via the interface circuit 13) and performs servo control. Part 8
CPU that issues instructions to -1, 8-2, 16 is the CPU 1
5, a program memory for storing programs running on the
Reference numeral 7 denotes a buffer memory for temporarily storing data from the decoders 7-1 and 7-2.

[0006] A description will be given of a reproducing method of the conventional optical disk device configured as described above. FIG. 13 is a data read sequence chart of a conventional optical disk device having two optical pickups.

In FIG. 13, the horizontal axis represents time, and one cell on the horizontal axis is the time required to read data for one reproduction unit from the disk. The vertical axis indicates the optical disk 1
One cell on the vertical axis indicates a data location area on the optical disc 1 for one reproduction unit. Here, for example, 2
An optical disc device having two optical pickups 3-1 and 3-2 will be described. Here, the ratio of the speed at which data is read from the optical disk 1 to the speed at which data is transferred from the optical disk device to the host computer 14 is 1: 4. This is because, when performing a data read operation using the two optical pickups 3-1 and 3-2 at the same time, the data transfer is performed after each optical pickup 3-1 and 3-2 read data for one reproduction unit. Is a speed ratio that satisfies the condition that the data transfer is completed with a margin before the data read for the next one reproduction unit is completed.

FIG. 14 is a control flowchart of a conventional optical disk device having two optical pickups. First, in response to a data read request from the host computer 14, the first optical pickup 3-1 seeks to the data position where the read request was made (S91), and after the seek is completed (S93), starts reading the data (S93). S94, 70
1). At this time, the second optical pickup 23 seeks to a position behind the read position of the first optical pickup 3-1 by the size requested to be read (S92), and after completion of the seek (S93), Start reading (S9
4, 702). First and second optical pickups 3-
1 and 3-2 read the data amount requested to be read to the first optical pickup 3-1 (S95).
Since the first and second optical pickups 3-1 and 3-2 finish reading data almost simultaneously, the buffer memory 17 is confirmed to be full (S96).
If 7 is not full, the first optical pickup 3-1 jump-seeks to a position after the data that has been read by the second optical pickup 3-2 (S97), and after the jump seek is completed (S93). ) Data reading is started (S94, 703). Second optical pickup 3-2
Is the lead position of the first optical pickup 3-1 (70
Jump seek is performed to a position behind by the size requested by the read request from 3) (S97), and after jump seek is completed (S93), data reading is started (S94, 70).
4).

[0009] Here, the jump seek means a data area (a discontinuous data area) other than a data area continuously recorded on the optical disc 1 (a data area recorded as a series of data on the same track or an adjacent track). Data area) and generally involves a seek in the tracking direction that seeks across one or more tracks (however, even if the data area is discontinuous, it is recorded on the same track). In the case of a data area that has been moved, seek in the tracking direction is not involved.)

In this manner, the operations of S53 to S57 are repeated to read data. At this time, the read data is stored in the buffer memory 17 and transferred in response to a data read request from the host computer 14. The data transfer to the host computer 14 is started after all the data requested to be read are collected. Therefore, the first data read by the optical pickup 3-1 is collected 70
Starting from point 5, data transfer is performed sequentially as shown in the lower part of FIG. Thus, by performing the data read by the reproducing method of the conventional technique, for example, the time required to execute the data read for 26 reproduction units is:
This is 25.5 playback units.

Next, a reproducing method of a conventional optical disk device having three optical pickups will be described. FIG. 15 is a read sequence chart of a conventional optical disk device having three optical pickups.
FIG. 16 is a control flowchart of a conventional optical disk device having three optical pickups. It should be noted that the device block diagram in the conventional technique is the optical pickup and the circuit elements (RF signal detector,
An RF signal slicer, a PLL circuit, a decoder, a servo controller, an actuator driver, and a sled driver) are further arranged.

First, in response to a data read request from the host computer 14, the first optical pickup 3-1
Seeks to the data position requested to be read (S10
1) After the seek is completed (S104), data reading is started (801, S105). At this time, the second optical pickup 3-2 seeks to a position behind the read position of the first optical pickup 3-1 by the size requested by the read (S102), and after the seek is completed (S104). ) Data reading is started (802, S105).

A third optical pickup 3-3 (not shown) seeks to a position behind the read position of the first optical pickup 3-1 by twice the size requested to be read. (S103), after seeking is completed (S104)
Data reading is started (803, S105). First, second, and third optical pickups 3-1, 3-2,
3-3 reads the data amount requested to be read to the first optical pickup 3-1 (S106). First, second, and third optical pickups 3-1, 3-2,
In step 3-3, data reading is completed almost at the same time. Therefore, it is confirmed that the buffer memory 17 is full (S107). If the buffer memory 17 is not full, the first optical pickup 3-1 performs the third optical pickup 3-1. The optical pickup 3-3 performs a jump seek to a position after the data that has been read (S1).
08), after jump seek is completed (S104), data reading is started (S105, 804).

The second optical pickup 3-2 confirms that the buffer memory 17 is full (S107). If the buffer memory 17 is not full, the read position (804) of the first optical pickup 3-1 is determined. ), A jump seek is performed to the position after the read request size (S10).
8) After the completion of the jump seek (S104), data reading is started (S105, 805).

The third optical pickup 3-3 confirms that the buffer memory 17 is full (S107). If the buffer memory 17 is not full, the read position (804) of the first optical pickup 3-1 is determined. ), A jump seek is performed to a position behind by twice the size requested to be read (S
108), after completion of the jump seek (S104), data reading is started (S104, 806). Thus S6
4 to S68 are repeated to read data.
At this time, the read data is stored in the buffer memory 17 and transferred in response to a data read request from the host computer 14.

By performing the data read by the conventional reproducing method, the time required to execute the data read for 26 reproduction units is 17.75 reproduction units, for example.

[0017]

However, the above-mentioned conventional optical disk device has the following problems.

(1) A plurality of optical pickups complete reading of specified data almost simultaneously. Therefore, jump seek is performed almost simultaneously to the next designated data read start position. At that time, it is necessary to simultaneously drive a plurality of actuator drivers and sled drivers, which causes a problem of causing an instantaneous increase in current consumption. This tendency becomes more remarkable as the number of optical pickups increases.

(2) A plurality of optical pickups perform a jump seek at the same time, thereby increasing a seek sound.

(3) By simultaneously driving the actuators,
Vibration increases, retry due to seek error increases, and data transfer speed decreases.

In addition, the above-mentioned conventional data reproducing method for an optical disk device has the following problems.

(1) After the data read is completed, jump seek is performed almost simultaneously to the next designated data read start position. Therefore, it is necessary to drive a plurality of actuator drivers and thread drivers at the same time. An instantaneous increase in current consumption occurs.

(2) A plurality of optical pickups perform a jump seek at the same time, thereby increasing a seek sound.

(3) By simultaneously driving the actuators,
Vibration increases, retry due to seek error increases, and data transfer speed decreases.

The optical disk apparatus of the present invention solves the above-mentioned conventional problems, and can suppress an instantaneous increase in current consumption and prevent a decrease in data transfer speed.
It is an object of the present invention to provide an optical disk device that has low seek sound and does not vibrate due to simultaneous jump seek.

Further, the data reproducing method of the optical disk apparatus of the present invention solves the above-mentioned conventional problems, and does not cause an instantaneous increase in current consumption and can prevent a decrease in data transfer speed. It is an object of the present invention to provide a data reproducing method for an optical disk device which has a low seek sound and does not vibrate due to simultaneous jump seek.

[0027]

In order to achieve the above object, an optical disk apparatus according to the present invention comprises a plurality of optical pickups capable of independently controlling a seek and a read, and a series of data areas is provided by a plurality of optical pickups. An optical disk device that reads the data area of a predetermined length allocated to the optical pickup and finishes reading the data area of the predetermined length allocated to the optical pickup. At that time, control means is provided for controlling to perform jump seek to the data area immediately after the last data area among the data areas shared by all the other optical pickups, and the control means includes: Multiple optical pickups simultaneously jump the length of the data area shared by each optical pickup by the control unit without overlapping the shared data areas. It is characterized in performing control to be free length to perform over click.

With this configuration, it is possible to provide an optical disk device capable of suppressing an instantaneous increase in current consumption and preventing a decrease in data transfer speed.

Further, the data reproducing method of the optical disk device of the present invention is a data reproducing method of an optical disk device in which a series of data areas are read by sharing a plurality of optical pickups. A read step of reading a data area of a predetermined length shared by the optical pickup, and when the optical pickup finishes reading the data area of the predetermined length shared by the read step, all other data are read at that time. And a jump seek step of performing a jump seek to the data area immediately after the last data area among the data areas shared by the optical pickups, wherein the data areas shared by the optical pickups in the read process overlap. The length of the data area shared by each optical pickup in the read process is Up it is characterized in that to control so as not to perform the jump seek time.

According to this configuration, it is possible to provide a data reproducing method for an optical disk device capable of suppressing an instantaneous increase in current consumption and preventing a decrease in data transfer speed.

[0031]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An optical disk device according to a first aspect of the present invention includes a plurality of optical pickups capable of independently controlling a seek and a read, and a series of data areas are shared by the plurality of optical pickups. An optical disc device that reads data areas of a predetermined length shared by the optical pickups and ends reading data areas of a predetermined length shared by the optical pickups. Control means for controlling to perform a jump seek to a data area immediately after the last data area among data areas shared by all other optical pickups, wherein the control means controls data shared by each optical pickup. Multiple optical pickups perform jump seek simultaneously on the length of the data area shared by each optical pickup by the control unit without overlapping the areas. Performing control to no length is obtained by it said.

With the above configuration, data can be read at high speed by always reproducing data from any of the optical pickups with respect to the reproduction request capacity from the host computer, and the data to be transferred is always secured. Can be. An increase in current consumption due to the movement control of the optical pickup can be kept low. Since a plurality of optical pickups do not perform jump seek at the same time, seek sound can be suppressed and vibration can be suppressed. Further, by suppressing the vibration, it is possible to improve the read quality and thereby reduce the number of retry reproductions, so that it is possible to prevent an interruption of data transfer (a decrease in data transfer speed).

According to a second aspect of the present invention, there is provided the optical disk device according to the first aspect, wherein the control means determines that the length of the data area shared by each optical pickup after the jump seek is constant. This is to control the tightening.

With the above arrangement, in addition to the operation described in the first aspect, by changing the length of the data area allocated to each optical pickup first, a plurality of optical pickups can perform jump seek simultaneously. The effect of being prevented is obtained.

According to a third aspect of the present invention, in the optical disk device according to the first aspect, the control means determines that a length of a data area shared by the optical pickup after performing the jump seek is different for each optical pickup. The value obtained by adding the length of the data area initially shared by the optical pickup to a multiple of the length of the data area shared by a certain optical pickup after performing a jump seek is equal to that of another optical pickup. Performing control so that the value does not coincide with a value obtained by adding the length of the data area initially shared by the other optical pickup to a multiple of the length of the data area shared after performing the jump seek. It was done.

According to the above configuration, in addition to the function of the first aspect, by changing the length of the data area allocated to each optical pickup first, a plurality of optical pickups can perform jump seek simultaneously. The effect of being prevented is obtained.

According to a fourth aspect of the present invention, there is provided the optical disk device according to the first aspect, wherein the control means determines the length of the data area shared by the optical pickup after performing the jump seek for each jump seek. Same or different, the length of the data area shared by the optical pickup that performed the n-th jump seek after the certain optical pickup performed the n-th jump seek is other than the optical pickup that performed the n-th jump seek From the length of the data area allocated after the m-th jump seek performed by the optical pickup before the n-th jump seek, the m-th jump from the m-th jump seek to the n-th jump seek A system that ensures that the optical pickup that performed the seek does not match the value obtained by subtracting the length of the read data area In which it was decided to carry out.

With the above arrangement, in addition to the operation described in the first aspect, by changing the length of the data area allocated to each optical pickup first, a plurality of optical pickups can simultaneously perform jump seek. The effect of being prevented is obtained.

The invention according to claim 5 is the invention according to claims 1 to 4
In the optical disk device according to any one of the above, the control means makes the length of the data area initially allocated to each optical pickup different for each optical pickup, and the control means sets the k (≧ 2) -th The control means controls the data area allocated first to the optical pickup to be a data area starting from a position immediately after the last position of the data area initially allocated to the (k-1) th optical pickup. It was done.

According to the above configuration, in addition to the function described in any one of claims 1 to 4, overlapping of data areas shared by the optical pickups is prevented, and a plurality of optical pickups simultaneously perform jump seek. The effect that the execution is also prevented is obtained.

According to a sixth aspect of the present invention, there is provided a data reproducing method for an optical disk apparatus in which a series of data areas are shared by a plurality of optical pickups and read. ,
A read step of reading a data area of a predetermined length shared by the optical pickup, and when the optical pickup finishes reading the data area of the predetermined length shared by the read step, all other data are read at that time. And a jump seek step of performing a jump seek to the data area immediately after the last data area among the data areas shared by the optical pickups, wherein the data areas shared by the optical pickups in the read process overlap. Instead, the length of the data area shared by each optical pickup in the reading process is controlled so that a plurality of optical pickups do not perform jump seek at the same time.

With the above configuration, data can be read at high speed by always reproducing data from any one of the optical pickups with respect to the required reproduction capacity from the host computer, and data to be transferred is always secured. Can be. An increase in current consumption due to the movement control of the optical pickup can be kept low. Since a plurality of optical pickups do not perform jump seek at the same time, seek sound can be suppressed and vibration can be suppressed. Further, by suppressing the vibration, it is possible to improve the read quality and thereby reduce the number of retry reproductions, so that it is possible to prevent an interruption of data transfer (a decrease in data transfer speed). According to a seventh aspect of the present invention, there is provided the data reproducing method of the optical disk device according to the sixth aspect, wherein the length of the data area shared by each optical pickup after performing the jump seek in the jump seek process is fixed. It is to be controlled in a certain way.

With the above arrangement, in addition to the function described in claim 6, by changing the length of the data area allocated to each optical pickup first, a plurality of optical pickups can perform jump seek simultaneously. The effect of being prevented is obtained.

According to an eighth aspect of the present invention, there is provided the data reproducing method of the optical disk device according to the sixth aspect, wherein the length of the data area shared by the optical pickup after performing the jump seek in the jump seek process. Each optical pickup is fixed, and a value obtained by adding the length of the data area initially shared by the optical pickup to a multiple of the length of the data area shared by a certain optical pickup after performing a jump seek is equal to that of another optical pickup. The control is performed so that the value does not coincide with a value obtained by adding the length of the data area initially shared by the other optical pickup to a multiple of the length of the data area shared by the pickup after performing the jump seek. Things.

With the above arrangement, in addition to the function described in claim 6, by changing the length of the data area allocated to each optical pickup first, a plurality of optical pickups can perform jump seek simultaneously. The effect of being prevented is obtained.

According to a ninth aspect of the present invention, there is provided the data reproducing method of the optical disk device according to the sixth aspect, wherein the length of the data area shared by the optical pickup after performing the jump seek in the jump seek process. The length of the data area shared by the optical pickup that performs the n-th jump seek after the certain optical pickup performs the n-th jump seek is the same or different length for each jump seek. Is performed after the m-th jump seek from the length of the data area shared after the m-th jump seek performed by the optical pickup other than the optical pickup that performed the n-th jump seek. Subtract the length of the data area read by the optical pickup that performed the m-th jump seek before Is obtained by the controlling so as not to match the value.

According to the above configuration, in addition to the operation described in claim 6, by changing the length of the data area allocated to each optical pickup first, a plurality of optical pickups can perform jump seek simultaneously. The effect of being prevented is obtained.

According to a tenth aspect of the present invention, there is provided the data reproducing method for an optical disk device according to any one of the sixth to ninth aspects, wherein the length of the data area initially allocated to each optical pickup is determined. The length is different for each optical pickup, and the data area initially allocated to the k (≧ 2) th optical pickup is immediately after the last position of the data area initially allocated to the (k−1) th optical pickup. The control is performed so that the data area starts from the position.

According to the above configuration, in addition to the operation described in any one of the sixth to ninth aspects, overlapping of the data areas shared by the optical pickups is prevented, and a plurality of optical pickups simultaneously perform jump seek. The effect that the execution is also prevented is obtained.

An embodiment of the present invention will be described below with reference to the drawings. (Embodiment 1) FIG. 1 is an apparatus block diagram of an optical disk apparatus according to Embodiment 1 of the present invention. 1 is an optical disk, 2 is a spindle motor, 3-1 and 3-2 are optical pickups, 4-1 and 4-2 are RF signal detectors, 5-1 and 5
-2 is an RF signal slicer, 6-1 and 6-2 are PLL circuits, 7-1 and 7-2 are decoders, 8-1 and 8-2 are servo controllers, and 9-1 and 9-2 are actuators. Driver, 10
-1, 10-2 are thread drives, 11 is a spindle motor drive signal generator, 12 is a spindle motor drive,
13 is an interface circuit, 17 is a buffer memory,
Reference numeral 15 denotes a CPU, which is the same as that shown in FIG. Reference numeral 18 denotes a program memory for storing a program of the CPU 15 for reproducing data according to the data reproducing method of the optical disk device of the present embodiment.

In the optical disk device of the present embodiment configured as described above, a data reproducing method will be described below. FIG. 2 is a sequence chart of a reproducing process of the optical disc device of the first embodiment, and FIG. 3 is a control flowchart of the optical disc device of the first embodiment.

First, when there is a data read request from the host computer 14, the first optical pickup 3-
1 seeks to the head position of the data area requested to be read (S01), and after completion of the seek (S02), starts reading data (201, S03). At this time, the second optical pickup 3-2 seeks to a position behind the read position of the first optical pickup 3-1 by the size requested to be read (S11), and after the seek is completed (S12). ) Data reading is started (202, S13).

At this time, the second optical pickup 3-2 reads a data amount twice as large as the size requested to be read to the first optical pickup 3-1 (S
14).

Here, the size requested to be read is
This is a size corresponding to a unit playback step (control) for sharing and playing back a storage area of the optical disk for each predetermined playback unit corresponding to a predetermined playback data amount. That is, it depends on the processing capability of the host computer 14 and the OS, and is not independently determined from the optical disk device side. For example, when the host computer 14 issues a reproduction request command of 16 kB, 16 kB, and 8 kB while the total reproduction request capacity is 40 kilobytes (kB), the unit reproduction step (control) is a reproduction operation of 16 kB. Point.

As will be described later, in order to shorten the data access time, in view of the fact that a request for reproducing the subsequent data is generally made when a certain data read request is made, the second and subsequent data are read. The optical pickup performs a read-ahead cache operation in which the data area following the data area requested to be read is continuously reproduced in advance and accumulated in the buffer memory 17.

In this manner, the subsequent second optical pickup 3
While -2 is reading data, the first optical pickup 3-1 finishes reading data (S04). Further, it is confirmed that the buffer memory 17 is full (S1).
5) If the buffer memory 17 is not full, the second optical pickup 3-2 continues to jump seek to a position after the data area to be read at the present time (S1).
6) After the completion of the jump seek (S12), data reading is started (203).

In this way, the operations from S12 to S16 are repeated to read data. At this time, the read data is stored in the buffer memory 17 and transferred in response to a data read request from the host computer 14. When the buffer memory 17 becomes full in S15 or when a required amount of data is reproduced, a standby state is set (S17).

As described above, the time required to execute, for example, 26 times of data reading by the data reproducing method of the optical disk according to the present embodiment is the same as that of the conventional technique.
A reduction of about 24% can be achieved for 19.5 times compared to 5.5 times. In addition, since jump seeks of the optical pickups 3-1 and 3-2 do not occur at the same time, the plurality of actuator drivers 9-1 and 9-2 and the thread drivers 10
-1, 10-2 need not be driven at the same time, and an instantaneous increase in current consumption can be prevented. In addition, since the two optical pickups 3-1 and 3-2 do not perform jump seek at the same time, the seek sound can be suppressed and the vibration can be suppressed. Further, by suppressing the vibration, it is possible to improve the read quality, thereby reducing retry reproduction, thereby preventing interruption of data transfer (reduction in data transfer speed).

(Embodiment 2) In Embodiment 2, a case where three optical pickups are used will be described. In FIG. 1, the block components (RF signal detector, RF signal slicer,
Hereinafter, the PLL circuit, the decoder, the servo controller, the actuator driver, and the sled driver) are collectively referred to as a pickup module. The configuration of the optical disk device of the present embodiment has a configuration including three pickup modules in FIG.

The data reproducing method of the optical disk device of the present embodiment having the above configuration will be described below. FIG. 4 is a sequence chart of a reproducing process of the optical disk device according to the second embodiment, and FIG.
10 is a control flowchart of the optical disk device of FIG.

First, when there is a data read request from the host computer 14, the first optical pickup 3-
1 seeks to the head position of the data area for which a read request has been made (S21), and after the seek is completed (S22), starts reading data (401, S23). At this time, the first optical pickup 3-1 reads a data amount twice as large as the size requested to be read (S24). that time,
The second optical pickup 3-2 seeks to a position twice as large as the size requested to be read from the read position of the first optical pickup 3-1 (S31), and after the seek is completed (S32). ) Start reading data (402,
S33).

When the third optical pickup 3-3 (not shown) completes the movement of the other optical pickups 3-1 and 3-2 and starts reading data (S41),
A seek is performed to a position three times the size requested by the read from the read position of the second optical pickup 3-1 (S42), and after the seek is completed (S43), data reading is started (S44). At this time, the third optical pickup 3
-3 reads a data amount twice as large as the size requested to be read to the first optical pickup 3-1 (S45).

While the first and third optical pickups are reading data, the second optical pickup 3-2 finishes reading data (S34). Further, it is confirmed that the buffer memory 17 is full (S35). If the buffer memory 17 is not full, the second optical pickup 3-2 continues to read the third optical pickup 3-3 at the present time. Jump seek to the position after the data area (S36), and after the completion of the jump seek (S43), data reading is started (S44). At that time, the second optical pickup 3-2 reads a data amount twice as large as the size requested to be read to the first optical pickup 3-1 (S45).

After the end of data reading, the first optical pickup 3-1 confirms that the buffer memory 17 is full (S
25) If the buffer memory 17 is not full, the second optical pickup 3-2 jump-seeks to a position after the data area to be read at the present time (S26), and after the jump seek is completed (S43). Is started (S44). At that time, the first optical pickup 3-1
Reads a data amount twice as large as the size requested to be read (S45).

Further, the third optical pickup 3-3 includes:
After the data read is completed, it is confirmed that the buffer memory 17 is full (S46). If the buffer memory 17 is not full, the first optical pickup 3-1 is moved to a position behind the data area to be read at the present time. Jump seek (S
47) After the completion of the jump seek (S43), data reading is started (S44).

In this way, the three pickup modules repeat the operations of S43 to S47 and read data. At this time, the read data is stored in the buffer memory 17 and transferred in response to a data read request from the host computer 14. S25 and S35,
In S45, whether the buffer memory 17 is full or not
When the required amount of data has been reproduced, a standby state is set (S4).
8).

As described above, the time required to execute, for example, 26 times of data reading by the data reproducing method of the optical disk according to the present embodiment is one of the prior art.
This is a reduction of about 24%, ie, 13.5 times compared to 7.75 times. Also, the optical pickups 3-1 and 3-
Since the jump seek of 2, 3-3 does not occur simultaneously, a plurality of actuator drivers 9-1, 9-2, 9-
3 and the plurality of thread drivers 10-1, 10-2, and 10-3 need not be simultaneously driven, and an instantaneous increase in current consumption can be prevented. Also, three optical pickups 3-
By not performing jump seek at the same time among a plurality of 1, 3, 2 and 3-3, a seek sound can be suppressed and a vibration can be suppressed. Further, by suppressing the vibration, it is possible to improve the read quality, thereby reducing retry reproduction, thereby preventing interruption of data transfer (reduction in data transfer speed).

(Embodiment 3) In Embodiment 3, a case where N optical pickups are used (N = 2, 3, 4,...) Will be described. That is, the configuration of the optical disk device according to the present embodiment includes N pickup modules (3-1, 4-1..., 10-1) to (3--1) in FIG.
N, 4-N..., 10-N).

In the optical disk device of the present embodiment having the above-described configuration, a data reproducing method will be described below. FIG. 6 is a control flowchart of the optical disk device of the third embodiment, FIG. 7 is a control flowchart showing a unit step read / seek operation of each optical pickup of the third embodiment, and FIG. 8 is a flowchart of the third embodiment. 5 is a sequence chart illustrating an example of a reproducing process of the optical disc device.

In FIGS. 6 to 8, N is the number of optical pickup modules of the optical disk device, J (k) is a jump seek flag of the optical pickup k (k = 1, 2,..., N), and R (k) ) Indicates an optical pickup k (k = 1, 2,...)
.., N) read scheduled reproduction unit remaining amount counter, P
(K) is an optical pickup k (k = 1, 2,..., N)
, Pmax is the maximum read area number of all the optical pickups at the present time (the maximum value of the data area number when each optical pickup has finished reading all the expected data areas), and L is each optical pickup. Represents the maximum number of reproduction units of the data area to be continuously read. J
When (k) is true, jump seek is performed,
When J (k) is False, jump seek is not performed. In addition, L is an integer value equal to or greater than N-1, and is assumed to be constant during the reproduction process. These variables are
Stored in the program memory 18 as data,
Reference and rewriting are possible by the CPU 15.

In FIG. 6, first, in response to a data read request from the host computer 14, the CPU 15
The read area number P (k) of each optical pickup 3-k (k = 1, 2,..., N), the read scheduled reproduction unit remaining amount counter R (k) of each optical pickup, and the maximum read scheduled area number Pmax Then, an initial value is set to the jump seek flag J (k) of each optical pickup (S51). Where R
As the initial value of (k), R (i) ≠ R (j) (i ≠
j, i = 1, 2,..., N, j = 1, 2,.
A value of 0 or more that satisfies the condition of N) is set. P (k)
Are initial values of P (1) = 1, P (i) = P (i−
1) + R (i-1) (i = 2, 3,..., N) is set. As an initial value of J (k) (k = 1, 2,..., N), true (True) when R (k) = 0,
Otherwise, false is set. Further, as an initial value of Pmax, Pmax = P (N) + R
(N) is set.

Next, the CPU 15 determines each of the optical pickups 3-k (k = 1, 2,..., Based on the above set values).
N) is a unit step read / read of an optical pickup described later.
A seek operation is performed, and each optical pickup 3-k receives P
The data area specified by (k) is read, or jump seek is performed to the head position of the data area specified by P (k) (S52-1 to S52-N). Since each optical pickup 3-k (k = 1, 2,..., N) finishes reading data almost at the same time, the CPU 15 confirms that the buffer memory 17 is full (S53). If not full, S52-1 to S52-N
Return to

In this way, the above S52-1 to S52-N,
S53 (and S54) is repeated to read data. At this time, the read data is stored in the buffer memory 17.
And performs transfer in response to a data read request from the host computer 14. In addition, S52-1 to S52-
In N, when the buffer memory 17 is full, the apparatus enters a standby state (S54), and waits for the buffer memory 17 to become empty before returning to S52-1 to S52-N. In addition, S52-
In 1 to S52-N, when the required amount of data has been reproduced, the above-described series of operations is terminated, and the apparatus enters a standby state.

Next, a read / seek operation in a unit step of the optical pickup will be described with reference to FIG. In FIG. 7, first, the CPU 15 determines J (k) for the optical pickup k (k = 1, 2,..., N).
Is checked (S60).

If J (k) is true, C
The PU 15 connects the optical pickup 3-k to the read area P.
Jump seek to the head position of (k) (S61), J
The value of (k) is set to false (False) (S62), and the process ends.

When J (k) is false (False),
The CPU 15 seeks to the head position of the area P (k) (S
63), the data area P (k) is read (S64), and the read scheduled reproduction unit remaining amount counter R (k) is decremented (decreased by 1) (S65). Next, CPU1
5 checks the value of R (k) (S66), and R (k)
If ≠ 0, the value of P (k) is increased by 1 and the process ends (S67). When R (k) = 0, the value of P (k) is set to Pmax + 1 (S68a), and the value of Pmax is updated to a value Pmax + L obtained by adding L to the original value of Pmax (S68).
b), the read scheduled reproduction unit remaining amount counter R (k) is set to L (S68c), J (k) is set to True (S68d), and the process ends. Accordingly, when R (k) = 0 in S66, the optical pickup k sets the data area Pmax + 1 (where Pmax is equal to S68b) in the next step.
(The value before update in step (1)), and the data area for the L reproduction unit is successively read from the data area to which the jump seek has been performed in the next step.

Next, a specific example of the data reproducing process of the optical disk device according to the above method will be described with reference to FIG. In FIG. 8, the vertical direction represents a reproduction unit step, and each column represents each optical pickup 3-k in each step.
(K = 1, 2,..., N) represents the number of the data area to be read. A downward arrow (↓) indicates that a jump seek is performed.

In FIG. 8A, N = 2, L = 2, and P (1) = 1, P (2) = 2, R (1) =
1, R (2) = 2, Pmax = 3, J (1) = J (2) =
This is an example in the case of False. In this case, the result is the same as the data reproduction process of the first embodiment. FIG. 8B shows N = 2, L = 3, and P (1) as an initial value.
= 1, P (2) = 3, R (1) = 2, R (2) = 3, P
This is an example when max = 5, J (1) = J (2) = False. In FIG. 8C, N = 3, L = 2, and P (1) = 1, P (2) = 3, P (3) =
4, R (1) = 2, R (2) = 1, R (3) = 0, Pma
x = 3, J (1) = J (2) = False, J (3) =
This is an example in the case of True. In this case, the result is the same as the data reproduction process of the second embodiment. FIG. 8D shows N = 4, L = 3, and P (1) as an initial value.
= 1, P (2) = 5, P (3) = 8, P (4) = 10,
R (1) = 4, R (2) = 3, R (3) = 2, R (4)
= 1, Pmax = 10, J (1) = J (2) = J (3) =
This is an example when J (4) = False.

As described above, according to the data reproducing method of the present embodiment, a plurality of jump seeks of the optical pickups 3-1 to 3-N are prevented from occurring at the same time. It is not necessary to drive simultaneously, and it is possible to prevent an instantaneous increase in power consumption. Also, N optical pickups 3-1 to 3-N
By not performing the jump seek at the same time, the seek sound can be suppressed to be small and the vibration can be suppressed to be small. Further, by suppressing the vibration, it is possible to improve the read quality, thereby reducing retry reproduction, thereby preventing interruption of data transfer (reduction in data transfer speed).

(Embodiment 4) In Embodiment 4, when the number of optical pickups is N (N = 2, 3, 4,...), The maximum reproduction unit of the data area to be continuously read by each optical pickup. The case where the numbers are not the same will be described. The configuration of the optical disk device of the present embodiment is such that the number of pickup modules (3-1, 4-1) in FIG.
..., 10-1) to (3-N, 4-N ..., 10-)
N).

The data reproducing method of the optical disk device of the present embodiment having the above-described configuration will be described below. In the present embodiment, the processing is performed according to the flowcharts of FIGS. 6 and 7 described in the third embodiment. However, the third embodiment differs from the third embodiment in that the maximum data area of the data area to be continuously read in S68b and S68c (see FIG. 7) is different. The number L of reproduction units is different for each optical pickup.
= 1, 2,..., N). Therefore, the program memory 18 has L (1), L (2),.
.., L (N) are stored as data.

In S51 (see FIG. 6), R
As the initial value of (k), R (i) ≠ R (j) (i ≠
j, i = 1, 2,..., N, j = 1, 2,.
N) that satisfies the condition of (N) is set to 0 or more. As initial values of P (k), P (1) = 1 and P (i) = P (i−
1) + R (i-1) (i = 2, 3,..., N) are set, and the initial value of J (k) (k = 1, 2,..., N) is R ( If k) = 0, true is set; otherwise, false is set, and Pmax
Is set as Pmax = P (N) + R (N), where L (k) is R (k) + nL (k) with respect to the initial value of R (k). = R (i) + mL (i)
It is assumed that integers m and n satisfying (i ≠ k, i, k = 1, 2,..., N) are set to values that do not exist.

The other operations are the same as those in the third embodiment, and the description is omitted. FIG. 9 shows a fourth embodiment.
6 is a sequence chart showing an example of a reproducing process of the optical disk device of FIG. In FIG. 9, N = 3, L (1) = 3,
L (2) = 1, L (3) = 3, and P (1) = 1, P (2) = 3, P (3) = 4, R (1) as initial values.
= 2, R (2) = 1, R (3) = 0, Pmax = 3, J
(1) = J (2) = False, J (3) = True.

As described above, according to the data reproducing method of the present embodiment, a plurality of jump seeks of the optical pickups 3-1 to 3-N are prevented from occurring at the same time, and a plurality of actuator drivers and thread drivers are used. It is not necessary to drive simultaneously, and it is possible to prevent an instantaneous increase in power consumption. In addition, since a plurality of the N optical pickups 3-1 to 3-N do not simultaneously perform the jump seek, the seek sound can be suppressed and the vibration can be suppressed. Further, by suppressing the vibration, it is possible to improve the read quality, thereby reducing retry reproduction, thereby preventing interruption of data transfer (reduction in data transfer speed).

(Fifth Embodiment) In the fifth embodiment, when the number of optical pickups is N (N = 2, 3, 4,...), Data to be continuously read after each jump seek of each optical pickup. A case where the maximum number of reproduction units of the areas is not the same will be described. In FIG. 1, the configuration of the optical disk device according to the present embodiment includes N pickup modules (3-1, 4-1..., 10-1) to (3-N, 4).
-N ..., 10-N).

The data reproducing method of the optical disk device of the present embodiment having the above-described configuration will be described below. The data reproducing method according to the present embodiment is performed according to the flowchart of FIG. 6 described in the third embodiment, but is different from the third embodiment in S51 and S52-1 to S52-1.
52-N. Further, in the present embodiment, since the maximum number L of reproduction units of the data area to be continuously read after each jump seek of each optical pickup has a different value for each jump seek, a series of numerical sequences for each jump seek L (i)｝ = {L (1), L (2), L
(3),... The sequence {L (i)} is an infinitely long sequence, but as a practical matter, the sequence {L (i)}
(I) Since the storage capacity of the program memory 18 for storing｝ is finite, a finite cyclic sequence such that L (i + M) = L (i) (M ≧ 1) is used.

First, in S51, the initial value of R (k) is R (i) ≠ R (j) (i ≠ j, i = 1,
2,..., N, j = 1, 2,..., N) are set to values equal to or greater than 0, and the initial values of P (k) are P (1) = 1, P (k) (I) = P (i-1) + R (i-
1) (i = 2, 3,..., N) is set, and J (k)
The initial value of (k = 1, 2,..., N) is R
If (k) = 0, true is set, otherwise, false is set, and Pmax = P (N) + R (N) is set as the initial value of Pmax. But,
At this time, {L (i)} is set to a sequence satisfying the following conditions with respect to the initial value of R (k).

L (i) ≠ L (j)-[S (i) -S
(J)] (i = j + 1, j + 2,..., J = 1, 2, 3,...
In the above equation, S (p) represents the number of steps when the p-th jump seek is performed, and R (k)
Depends on the initial value of. Further, a counter q indicating the number of times the jump seek has been performed is stored in the program memory 18, and 0 is set as an initial value.

FIG. 10 is a control flowchart showing a unit step read / seek operation of each optical pickup according to the fifth embodiment. In FIG. 10, first, the CPU 15
Checks J (k) for the optical pickup k (k = 1, 2,..., N) (S80).

If J (k) is true, C
The PU 15 connects the optical pickup 3-k to the read area P.
Jump seek to the head position of (k) (S81), J
The value of (k) is set to false (S82), and the process ends.

When J (k) is false,
The CPU 15 seeks to the head position of the area P (k) (S
83), the data area P (k) is read (S84), and the read scheduled reproduction unit remaining amount counter R (k) is decremented (S85). Next, the CPU 15 checks the value of R (k) (S86).
The value of (k) is increased by 1 and the process ends (S87). R
If (k) = 0, the value of P (k) is set to Pmax + 1 (S88a), the value of Pmax is updated to the value Pmax + L obtained by adding L to the original value of Pmax (S88b), and the read is scheduled The reproduction unit remaining amount counter R (k) is set to L (S88).
c), J (k) is set to true (S88)
d), the counter q indicating the number of times that the jump seek has been performed is increased by 1 (S89), and the processing ends. Thereby, S
86, when R (k) = 0, the optical pickup k
Is the data area Pmax + 1 (however, Pm
ax is the jump seek to the value before the update in S88b), and the data area for the L reproduction unit is successively read from the next step to the data area jump-seeked.

FIG. 11 is a sequence chart showing an example of a reproducing process of the optical disk device according to the fifth embodiment. FIG.
1, N = 3, {L (i)} = {6,3,3,
5, 3, 4, 7, 5, 3,...}, And P (1) = 1, P (2) = 3, P (3) = 4, R
(1) = 2, R (2) = 1, R (3) = 3, Pmax =
6, J (1) = J (2) = J (3) = False.

As described above, according to the data reproducing method of the present embodiment, a plurality of jump seeks of the optical pickups 3-1 to 3-N are prevented from occurring at the same time. It is not necessary to drive simultaneously, and it is possible to prevent an instantaneous increase in power consumption. Also, N optical pickups 3-1 to 3-N
By not performing the jump seek at the same time, the seek sound can be suppressed to be small and the vibration can be suppressed to be small. Further, by suppressing the vibration, it is possible to improve the read quality, thereby reducing retry reproduction, thereby preventing interruption of data transfer (reduction in data transfer speed).

[0094]

As described above, according to the optical disk apparatus of the first aspect of the present invention, a plurality of optical pickups capable of independently controlling the seek and the read are provided, and a series of data areas is provided by a plurality of optical pickups. An optical disc device that is shared and read by a pickup, wherein each optical pickup reads a data area of a predetermined length shared by the optical pickup and finishes reading the data area of a shared length. And control means for controlling to perform a jump seek to a data area immediately after the last data area among data areas shared by all other optical pickups at that time, wherein the control means comprises: The control means does not overlap the data area shared by the optical pickups, and the plurality of optical pickups simultaneously jump jump the length of the data area shared by each optical pickup. By controlling the length of the optical pickup so as not to perform the reading, it is possible to provide an optical disc device that can read data at high speed and can reduce the instantaneous current consumption at the time of seeking of the optical pickup. .

An optical disk device capable of returning read data at high speed in response to a data read request from a host computer can be provided.

Since a plurality of optical pickups do not perform jump seek at the same time, it is possible to provide an optical disk apparatus capable of suppressing seek noise and vibration.

Furthermore, an optical disk device capable of improving read quality by suppressing vibration and thereby reducing retry reproduction, thereby preventing interruption of data transfer (reduction in data transfer speed). Can be provided. The advantageous effect described above can be obtained.

According to the second aspect of the present invention,
2. The optical disk device according to claim 1, wherein the control unit performs control to make the length of a data area shared by each optical pickup constant after performing the jump seek. In addition, by first changing the length of the data area shared by each optical pickup, it is possible to provide an optical disk device capable of preventing a plurality of optical pickups from performing jump seek at the same time. An advantageous effect is obtained.

According to the third aspect of the present invention,
2. The optical disk device according to claim 1, wherein the control means makes the length of the data area shared by the optical pickups after performing the jump seek constant for each optical pickup, and a certain optical pickup performs the jump seek. 2. The method according to claim 1, wherein control is performed so that the value does not coincide with a value obtained by adding the length of the data area first shared by the other optical pickup to a multiple of the length of the data area shared by the other optical pickup. To provide an optical disc device capable of preventing a plurality of optical pickups from simultaneously performing a jump seek by changing the length of a data area shared by each optical pickup first, in addition to the effects described above. This has the advantageous effect of being able to perform.

According to the invention described in claim 4 of the present invention,
2. The optical disk device according to claim 1, wherein the control unit sets the length of the data area shared by the optical pickup after performing the jump seek to be the same or different for each jump seek. Is performed, the length of the data area shared by the optical pickup that performed the n-th jump seek is the length of the data area that the optical pickup other than the optical pickup that performed the n-th jump seek performed before the n-th jump seek. The length of the data area read by the optical pickup that performed the m-th jump seek after the m-th jump seek until the n-th jump seek is performed from the length of the data area shared after the first jump seek The control according to claim 1 is performed so as not to match the value obtained by subtracting In addition, by changing the length of the data area shared by each optical pickup first, it is possible to provide an optical disc device capable of preventing a plurality of optical pickups from performing jump seek at the same time. The advantageous effect described above can be obtained.

According to the fifth aspect of the present invention,
5. The optical disk device according to claim 1, wherein the control unit changes the length of a data area initially allocated to each optical pickup for each optical pickup, and the control unit sets k (≧ 2). ) The first data area shared by the optical pickup is controlled by the control means so that the data area starts from a position immediately after the last position of the data area initially shared by the (k-1) th optical pickup. By doing so, in addition to the effect according to any one of claims 1 to 4, overlapping of data areas shared by the optical pickups is prevented, and simultaneous jump seeking by a plurality of optical pickups is also prevented. An advantageous effect of being able to provide an optical disk device capable of performing such operations is obtained.

According to the data reproducing method of an optical disk device of the present invention, a data reproducing method of an optical disk device in which a series of data areas are read by sharing a plurality of optical pickups with each other, The data reproducing step is a read step of reading a data area of a predetermined length shared by the optical pickup, and when the optical pickup finishes reading the data area of the shared length in the reading step. A jump seek step of performing a jump seek to the data area immediately after the last data area among the data areas shared by all of the other optical pickups at that time. The read data area does not overlap and the length of the data area shared by each optical pickup in the read process. Optical disc that can read data at high speed and reduce the instantaneous current consumption during seek of the optical pickup by controlling multiple optical pickups not to perform jump seek at the same time. It is possible to provide a data reproducing method of the device.

It is possible to provide a data reproducing method of an optical disk device capable of returning read data at high speed in response to a data read request from a host computer.

Since a plurality of optical pickups do not perform jump seek at the same time, it is possible to provide a data reproducing method of an optical disk apparatus capable of suppressing seek noise and vibration.

Furthermore, by suppressing the vibration, it is possible to improve the read quality, thereby reducing the retry reproduction, and thereby preventing the data transfer from being interrupted (decrease in the data transfer speed). An advantageous effect that a data reproducing method can be provided is obtained.

According to the seventh aspect of the present invention,
The optical disk device according to claim 6, wherein the length of the data area allocated to each optical pickup is controlled to be constant after the jump seek is performed in the jump seek process, so that the effect according to claim 6 is achieved. In addition, the present invention provides a data reproducing method for an optical disk device that can prevent a plurality of optical pickups from performing a jump seek at the same time by first changing the length of a data area shared by each optical pickup. This has the advantageous effect of being able to do so.

According to the invention described in claim 8 of the present invention,
7. The optical disk device according to claim 6, wherein the length of the data area shared by the optical pickups after performing the jump seek in the jump seek process is constant for each optical pickup, and after the certain optical pickup performs the jump seek. The value obtained by adding the length of the data area initially shared by the optical pickup to the multiple of the length of the shared data area is a multiple of the length of the data area shared by the other optical pickups after performing the jump seek. The other optical pickups are controlled so that they do not coincide with the value obtained by adding the length of the data area initially allocated to the other optical pickups. By changing the length of the data area, it is possible to prevent multiple optical pickups from performing jump seek at the same time. Advantageous effect that it is possible to provide a data reproducing method of the optical disk device can be obtained.

According to the ninth aspect of the present invention,
7. The optical disk device according to claim 6, wherein the length of the data area shared by the optical pickup after performing the jump seek in the jump seek process is the same or different for each jump seek, and a certain optical pickup performs the n-th optical seek. The length of the data area shared by the optical pickup that performed the n-th jump seek after the jump seek was performed by an optical pickup other than the optical pickup that performed the n-th jump seek before the n-th jump seek N from the length of the data area shared after the m-th jump seek
7. The optical pickup according to claim 6, wherein control is performed so that the value does not coincide with a value obtained by subtracting the length of the read data area from the optical pickup that has performed the m-th jump seek before the second jump seek is performed. In addition to the effect, a data reproducing method for an optical disc apparatus is provided which can prevent a plurality of optical pickups from simultaneously performing a jump seek by changing the length of a data area shared by each optical pickup first. This has the advantageous effect that it can be performed.

According to the tenth aspect of the present invention, in the optical disk device according to any one of the sixth to ninth aspects, the length of the data area initially allocated to each optical pickup is equal to each length. The length is different for each optical pickup, and the data area allocated first to the k (≧ 2) th optical pickup is a position immediately after the last position of the data area allocated first to the (k−1) th optical pickup. By controlling so as to be a data area starting from, in addition to the effect according to any one of claims 6 to 9, overlapping of data areas shared by each optical pickup is prevented,
An advantageous effect of being able to provide a data reproducing method for an optical disk device that can also prevent a plurality of optical pickups from performing a jump seek at the same time is obtained.

[Brief description of the drawings]

FIG. 1 is a device block diagram of an optical disc device according to a first embodiment of the present invention.

FIG. 2 is a sequence chart of a reproducing process of the optical disc device according to the first embodiment;

FIG. 3 is a control flowchart of the optical disc device according to the first embodiment;

FIG. 4 is a sequence chart of a reproducing process of the optical disc device according to the second embodiment.

FIG. 5 is a control flowchart of the optical disc device according to the second embodiment.

FIG. 6 is a control flowchart of the optical disc device according to the third embodiment.

FIG. 7 is a control flowchart showing a read / seek operation in a unit step of each optical pickup according to the third embodiment;

FIG. 8 is a sequence chart showing an example of a reproducing process of the optical disc device according to the third embodiment;

FIG. 9 is a sequence chart showing an example of a reproducing process of the optical disc device according to the fourth embodiment.

FIG. 10 is a control flowchart showing a unit step read / seek operation of each optical pickup according to the fifth embodiment;

FIG. 11 is a sequence chart showing an example of a reproducing process of the optical disc device of the fifth embodiment.

FIG. 12 is a device block diagram of a conventional optical disk device having two optical pickups.

FIG. 13 is a data read sequence chart of a conventional optical disk device having two optical pickups.

FIG. 14 is a control flowchart of a conventional optical disk device having two optical pickups.

FIG. 15 is a read sequence chart of a conventional optical disk device having three optical pickups.

FIG. 16 is a control flowchart of a conventional optical disk device having three optical pickups.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Spindle motor 3-1 and 3-2 Optical pickup 4-1 and 4-2 RF signal detector 5-1 and 5-2 RF signal slicer 6-1 and 6-2 PLL circuit 7-1 and 7- 2 Demodulator 8-1, 8-2 Servo controller 9-1, 9-2 Actuator driver 10-1, 10-2 Thread driver 11 Spindle motor drive signal generator 12 Spindle motor driver 13 Interface circuit 14 Host Computer 15 CPU 16, 18 Program memory 17 Buffer memory

Claims (10)

[Claims] 1. An optical disk device comprising a plurality of optical pickups capable of independently controlling a seek and a read, and reading a series of data areas by sharing the plurality of optical pickups, wherein each of the optical pickups is When the data area of a predetermined length assigned to the optical pickup is read, and the data area of the assigned length is read, the data area is assigned to all the other optical pickups at that time. Control means for controlling a jump seek to a data area immediately after the last data area in the data area, wherein the control means does not overlap the data areas shared by the optical pickups, Is the length of the data area shared by the optical pickups so that the plurality of optical pickups do not perform the jump seek at the same time. Optical disc apparatus and performs the control to. 2. The optical disk apparatus according to claim 1, wherein said control means performs control to make the length of a data area shared by each of said optical pickups constant after performing said jump seek. 3. The control means makes the length of a data area shared by the optical pickups after performing the jump seek constant for each of the optical pickups, and a certain optical pickup performs the jump seek. The value obtained by adding the length of the data area initially shared by the optical pickup to a multiple of the length of the data area to be shared later is the length of the data area shared by the other optical pickups after performing the jump seek. 2. The optical disc apparatus according to claim 1, wherein control is performed so that the value does not coincide with a value obtained by adding a length of a data area initially shared by the other optical pickup to a multiple. 4. The control means sets the length of a data area shared by the optical pickup after performing the jump seek to be the same or different for each of the jump seeks.
The length of the data area shared by the optical pickup performing the n-th jump seek after the optical pickup performs the n-th jump seek is the optical pickup performing the n-th jump seek The n-th jump seek is performed after the m-th jump seek from the length of the data area shared after the m-th jump seek performed by the optical pickup other than the n-th jump seek before the n-th jump seek By m
2. The optical disc device according to claim 1, wherein control is performed so that the value does not coincide with a value obtained by subtracting a length of a data area read by the optical pickup that has performed the jump seek for the first time. 5. The control means varies the length of a data area initially assigned to each optical pickup for each optical pickup, and the control means first assigns a data area to a k (≧ 2) th optical pickup. The control section performs control so that the data area to be started is a data area starting from a position immediately after the last position of the data area initially assigned to the (k-1) th optical pickup. 1
The optical disk device according to any one of claims 1 to 4. 6. A data reproducing method for an optical disk device in which a series of data areas are read by sharing a plurality of optical pickups by a plurality of optical pickups. And when the optical pickup finishes reading the allocated data area of a predetermined length during the reading step, the optical pickup is allocated to all the other optical pickups at that time. A jump seek step of performing a jump seek to the data area immediately after the last data area in the data area, wherein the data areas shared by the optical pickups in the read step do not overlap, and in the read step, The plurality of optical pickups simultaneously determine the length of the data area shared by each optical pickup. Data reproducing method of an optical disk apparatus and controls so as not to perform Pushiku. 7. The optical disk according to claim 6, wherein a length of a data area allocated to each of the optical pickups is controlled to be constant after the jump seek is performed in the jump seek process. Device data reproduction method. 8. A data area shared by the optical pickups after performing the jump seek in the jump seek process is fixed for each of the optical pickups, and after a certain optical pickup performs the jump seek. The value obtained by adding the length of the data area initially shared by the optical pickup to a multiple of the length of the shared data area is:
Control is performed so that the value does not coincide with a value obtained by adding the length of the data area initially shared by the other optical pickup to a multiple of the length of the data area shared by the other optical pickup after performing the jump seek. 7. The data reproducing method for an optical disk device according to claim 6, wherein 9. A data area allocated to the optical pickup after performing the jump seek in the jump seek process may have the same length or a different length for each of the jump seeks. The length of the data area shared by the optical pickup that performed the n-th jump seek after the jump seek was performed by the optical pickups other than the optical pickup that performed the n-th jump seek. The m-th jump seek after the m-th jump seek until the n-th jump seek is performed based on the length of the data area allocated after the m-th jump seek performed before the jump seek Is equal to the value obtained by subtracting the length of the data area read by the optical pickup. Data reproducing method for an optical disc drive according to claim 6, wherein the controller controls so as not to. 10. The data area initially allocated to each optical pickup has a different length for each optical pickup, and the data area initially allocated to the k (≧ 2) th optical pickup is k−k. 10. The data area according to claim 6, wherein the data area is controlled so as to start from a position immediately after the last position of the data area initially allocated to the first optical pickup. 3. A data reproducing method for an optical disk device according to claim 1.