JPH07262709A - Optical disk device - Google Patents

Abstract

PURPOSE:To simply secure the reliability of data by simultaneously recording the same data on both sides of an optical disk recording medium. CONSTITUTION:At the time of recording data independently of both sides la and 1b of the optical disk recording medium 1, the recording data is received by a multiple-unit control part 23A, and is stored in memory buffers 6A and 6B. At the same time as that the data from the buffer 6A is recorded on the recording surface 1a, the data from the buffer 6B is recorded on the recording surface lb. At this time, the the data to be recorded on the surface 1b is managed to be the same as the data to be recorded on the surface 1a in terms of their address and contents. Then, when the data is not normally read out of the surface 1a due to dirt, etc., at the time of reading out the data, the data in an area of the surface 1b managed by the same address is read out, and hence the normal data can thus be obtained.

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,
In particular, the present invention relates to an optical disc device that can easily secure the reliability of data recorded / reproduced on / from an optical disc recording medium.

[0002]

2. Description of the Related Art Generally, when recording important data on an optical disk, it is desirable to perform a work such as backup or mirroring in order to ensure the reliability of the data.

Here, backup means another independent medium (another optical disk cartridge / magnetic disk, etc.).
The same data is recorded in the same format. Mirroring is a method that allows the same data to be written to two independent optical disk drives to check for loss of data and to restore normal data.

[0004]

However, in the case of the above-mentioned backup method, even if it is simply considered, it requires twice as much labor / time for the original recording on the optical disk and the backup recording.

Further, in the case of the mirroring system, two optical disk drives are required, and when writing to an optical disk cartridge, if one optical disk cartridge is lost, there is a drawback that data cannot be guaranteed.

Further, in either of the above methods, the host side (control side) needs to manage and instruct these operations. Therefore, the present invention has been made in view of the above points, and the same data is simultaneously recorded on both surfaces of the optical disk recording medium by using an optical disk medium capable of independently recording / reproducing data on both surfaces. Accordingly, it is an object of the present invention to provide an optical disc device that can easily secure the reliability of data.

[0007]

According to the present invention, first and second optical head means are provided opposite to each surface of an optical disk recording medium capable of recording / reproducing data on both surfaces, and the first optical head means.
And a data processing control means for performing data processing and control for simultaneously recording / reproducing the same recording data on a predetermined address on both sides of the optical disk recording medium for the second optical head means. The processing control means, when reading the data from one side of the optical disc recording medium having the recorded data recorded on both sides, when the data at a certain address cannot be read normally, the other side of the optical disc recording medium is read. There is provided an optical disk device characterized by performing data processing and control for reading data on a corresponding address in.

Further, according to the present invention, first and second optical head means are provided opposite to each surface of the optical disk recording medium capable of recording / reproducing data on both surfaces, and the first and second optical heads. Means for performing data processing and control for simultaneously recording / reproducing the same recording data on predetermined addresses on both sides of the optical disc recording medium, the data processing controlling means comprising: When reading data from one side of the optical disk recording medium having data recorded on both sides, when data on a certain address cannot be read normally, data on the corresponding address on the other side of the optical disk recording medium Data processing and control for reading the data, and the data processing control means stores the recording data in the optical disk recording medium. When the main recording on one side, the optical disk apparatus is provided which comprises carrying out the data processing and control for simultaneously backing up recorded on the other surface.

Further, according to the present invention, first and second optical head means are provided opposite to each surface of the optical disk recording medium capable of recording / reproducing data on both surfaces, and the first and second optical heads. Means for performing data processing and control for simultaneously recording / reproducing the same recording data on predetermined addresses on both sides of the optical disc recording medium, the data processing controlling means comprising: When reading data from one side of the optical disk recording medium having data recorded on both sides, when data on a certain address cannot be read normally, data on the corresponding address on the other side of the optical disk recording medium Data processing and control for reading the data, and the data processing control means stores the recording data in the optical disk recording medium. Optical disc apparatus, wherein the simultaneously recorded while managing to have the same content on the same address in both sides is provided.

Further, according to the present invention, the first and second optical head means and the first and second optical head means are provided to be opposed to each surface of the optical disk recording medium capable of recording data on both surfaces. On the other hand, there is provided an optical disk device comprising a data processing control means for performing data processing and control for simultaneously recording the same recording data on predetermined addresses on both sides of the optical disk recording medium. .

Further, according to the present invention, first and second optical head means arranged opposite to the first and second surfaces of the optical disk recording medium capable of recording / reproducing data on both sides, and the first And a data processing control means for performing data processing and control for simultaneously recording / reproducing the same recording data on a predetermined address on both sides of the optical disk recording medium for the second optical head means. Processing control means, means for receiving the recording data, means for transferring the received recording data to a first memory,
A means for transferring the received recording data to a second memory; and a means for supplying the recording data transferred to the first memory to the first optical head means for the first surface of the optical disc recording medium. Means for activating writing, means for supplying the recording data transferred to the second memory to the second optical head means to activate writing on the second surface of the optical disc recording medium, and the optical disc recording There is provided an optical disk device comprising means for judging the end of writing on the first surface of the medium, and means for judging the end of writing on the second surface of the optical disk recording medium.

Further, according to the present invention, first and second optical head means provided opposite to the first and second surfaces of the optical disk recording medium capable of recording / reproducing data on both sides, and the first And a data processing control means for performing data processing and control for simultaneously recording / reproducing the same recording data on a predetermined address on both sides of the optical disk recording medium for the second optical head means. Processing control means, means for receiving the recording data, means for transferring the received recording data to a first memory,
A means for transferring the received recording data to a second memory; and a means for supplying the recording data transferred to the first memory to the first optical head means for the first surface of the optical disc recording medium. Means for activating writing, means for supplying the recording data transferred to the second memory to the second optical head means to activate writing on the second surface of the optical disc recording medium, and the optical disc recording Means for determining the end of writing on the first side of the medium, means for determining the end of writing on the second side of the optical disc recording medium, and means for activating the reading on the first side of the optical disc recording medium. A means for determining whether or not the first surface of the optical disk recording medium has been normally read, and a first surface of the optical disk recording medium. When the loading was not successful against, an optical disk apparatus characterized by comprising a means for activating the reading for the second surface of the optical disc recording medium is provided.

[0013]

According to the above-mentioned solution means, by using the optical disk medium capable of independently recording / reproducing data on both sides,
By simultaneously recording the same data on both sides of the optical disc recording medium, the reliability of the data can be easily secured.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram of an optical disk drive device according to an embodiment of the present invention.

That is, in FIG. 1, an optical disk recording medium 1 capable of independently accessing and recording / reproducing on both sides (front and back surfaces or upper and lower surfaces) 1a and 1b is a motor 2.
It is rotatably mounted on a turntable 2a driven by.

The first and second optical heads 3A and 3B are movably supported in the directions of the arrows so as to face both sides 1a and 1b of the optical disk recording medium 1.

Various control signals are supplied (or derived) from the control units 4A and 4B to the optical heads 3A and 3B, respectively, and data is supplied from the data processing units 5A and 5B through the memory buffers 6A and 6B. (Or derived).

The motor 2 is controlled by a motor controller 18A. The control units 4A and 4B, the memory buffers 6A and 6B, and the motor control unit 18A are controlled by a central control unit 23A such as a CPU.

The central control unit 23A is connected to a host computer or other higher-level model (not shown) or a communication line via a data bus. FIG. 2 shows a specific example of a drive system, a control system and a data processing system for one side of the optical disc recording medium in the optical disc drive device, but FIG.
It is based on.

The optical disk drive records, reproduces, and erases information on the optical disk recording medium 1 by using convergent light. Grooves (recording tracks) are spirally formed on the surface of the disc 1.
Is rotated by the motor 2 at a constant speed, for example.

The motor 2 is controlled by a motor control circuit 18. Recording information on the disc 1,
The reproduction is performed by the optical head 3 provided below the disc 1.

The optical head 3 is fixed to a drive coil 13 which constitutes a drive portion of a linear motor 31, and the drive coil 13 is connected to a linear motor control circuit 17.

A linear motor position detector 26 is connected to the linear motor control circuit 17, and the linear motor position detector 26 outputs a position signal by selecting the optical scale 25 provided on the optical head 3. .

A permanent magnet (not shown) is provided on the fixed portion of the linear motor 31, and the drive coil 1
The magnetic head 3 is excited by the linear motor control circuit 17, so that the optical head 3 is moved in the radial direction of the disk 1.

An objective lens 6 is held on the optical head 3 by a wire or a leaf spring (not shown). The objective lens 6 is moved in the focusing direction (optical axis direction of the lens) by the drive coil 5 and is driven by the drive coil 4. It can be moved in the tracking direction (direction orthogonal to the optical axis of the lens).

Laser light generated by a laser diode 9 as a semiconductor laser oscillator driven by the laser control circuit 51 passes through the collimator lens 11a, the half prism 11b, and the objective lens 6 to the disc 1
Light reflected on the disc 1 and reflected on the disc 1 is guided to the photodetector 8 through the objective lens 6, the half prism 11b, the condenser lens 10a, and the cylindrical lens 10b.

In the vicinity of the laser diode 9, a monitor photodiode PD is provided as an issue amount detecting device for detecting the issue amount of the laser diode 9. A monitor current as a detection signal from the photodiode PD is supplied to the laser control circuit 51.

The photodetector 8 is composed of four-divided photodiodes 8a to 8d. The cathode sides of the photodiodes 8a to 8d of the optical head 3 are commonly connected to the video signal preamplifier circuit 52, and the anode sides thereof are connected to the focus / tracking processing circuit 40, respectively.

As a result, a current flows from the cathode to the anode in the photodiodes 8a to 8d according to the reflected light from the disk 1, and the video signal processing is performed using the sum current extracted from the cathode side. Focusing (keeping the distance between the disc 1 and the objective lens 6 constant) / tracking (according to the guide groove recorded on the disc 1 in advance) is performed using the respective currents taken out from the anode side.

The focus / tracking processing circuit 40 includes a focusing control circuit 15 and a tracking control circuit 1.
6, linear motor control circuit 17, adder 30a, differential amplifiers OP1 and OP2, and gain switchable amplifier 12
a to 12d.

These amplifiers 12a to 12d are current-voltage converters for converting the current outputs of the photodiodes 8a to 8d into voltage signals, and are circuits having the same configuration.

That is, the output signal of the photodiode 8a of the photodetector 8 is added to the adder 30 via the amplifier 12a.
The output signal of the photodiode 8b, which is supplied to one end of the a and 30c, is added to the adders 30b and 30d via the amplifier 12b.
Of the photodiode 8c is supplied to the other end of the adders 30b and 30c via the amplifier 12c, and the output signal of the photodiode 8d is supplied to the amplifier 1c.
It is supplied to the other ends of the adders 30a and 30d via 2d.

The output signal of the adder 30a is a differential amplifier OP.
1 is supplied to the inverting input terminal of the differential amplifier OP1, and the output signal of the adder 30b is supplied to the non-inverting input terminal of the differential amplifier OP1. As a result, the differential amplifier OP1 includes the adder 30a,
A signal corresponding to the difference voltage of 30b is supplied to the tracking control circuit 16.

The tracking control circuit 16 generates a track drive signal according to the track difference signal supplied from the differential amplifier OP1. The track drive signal output from the tracking control circuit 16 is supplied to the drive coil 4 in the tracking direction.

The track difference signal used in the tracking control circuit 16 is supplied to the linear motor control circuit 17. The output signal of the adder 30c is the differential amplifier O
The signal is supplied to the inverting input terminal of P2, and the output signal of the adder 30d is supplied to the non-inverting input terminal of the differential amplifier OP2.

As a result, the differential amplifier OP2 supplies the focusing control circuit 15 with a signal relating to the focus point in accordance with the difference between the adders 30c and 30d. The output signal of the focusing control circuit 15 is supplied to the focusing drive coil 5 and is controlled so that the laser light is always in perfect focus on the disk 1.

The photodiode 8a of the photodetector 8 in the state where focusing and tracking are performed as described above.
The sum current of the outputs of 8d reflects the unevenness of the pits (recording information) formed on the track.

This sum current is converted into a voltage value by the preamplifier circuit 52 for the video signal, and the video signal processing circuit 19 is converted.
Image data and address data (track number, sector number, etc.) are reproduced by the video signal processing circuit 19.

A recording signal generation circuit 34 as a modulation circuit for modulating recording data supplied from an optical disk control device 33 as an external device through the interface circuit 32 into a recording pulse is provided in the preceding stage of the laser control circuit 51. Has been.

Further, in this disk device, a focusing control circuit 15, a tracking control circuit 16,
A D / A converter 22 used when exchanging information between the linear motor control circuit 17 and the CPU 23 is provided.

Further, the tracking control circuit 16 uses the CP
The objective lens 6 is moved according to the track jump signal supplied from U23 via the D / A converter 22, and the laser beam is moved by one track.

Laser control circuit 51, focusing control circuit 15, tracking control circuit 16, linear motor control circuit 17, motor control circuit 18, signal processing circuit 19,
The recording signal generation circuit 34 and the like are connected to C via the bus line 20.
Controlled by the PU 23, the CPU 23 performs a predetermined operation according to a program stored in the memory 24.

Next, the operation of the optical disc device according to the embodiment of the present invention constructed as described above will be explained.
This optical disk device is a host for recording data using an optical disk drive as shown in FIG. 1 that is capable of independently accessing / writing / reading on both sides 1a, 1b of an optical disk recording medium 1 (for example, an optical disk cartridge). The data received from the side is simultaneously written in the areas managed by the same address on both sides 1a and 1b of the optical disc recording medium 1.

First, when the data to be recorded in the general control section 23A is received from the external host side via the data bus, the data is stored in the memory buffers 6A and 6B. Here, on both sides of the optical disc recording medium 1 (for convenience, one side is referred to as A side 1a and the other side is referred to as B side 1b).
As shown in (a) and (b), there is an area (block) that is managed by address numbers starting from 0 and increasing by 1 from the inner circumference to the outer circumference, and the A side 1a contains data from the memory buffer 6A. Is recorded, at the same time, side B 1b
The data in the memory buffer 6B is recorded in the
At this time, the data recorded on the B side 1b is managed so that the data and the address recorded on the A side 1b have the same address and content.

Thus, both sides 1a of the optical disk medium 1 are
The same data managed by the same address is recorded in 1b. FIGS. 4A and 4B show a flowchart in which the double-sided simultaneous recording as described above is performed in steps S1 to S7, and thereafter the reproduction is performed in steps S11 to S13.

That is, at the time of recording, after receiving the recording data, the received recording data is transferred to the first memory and the received recording data is transferred to the second memory.

Then, the recording data transferred to the first memory is supplied to the first optical head to start writing on the first surface of the optical disk recording medium, and transferred to the second memory. The written recording data is supplied to the second optical head to start writing on the second surface of the optical disc recording medium.

After that, the end of writing on the first surface of the optical disk recording medium is determined, and the end of writing on the second surface of the optical disk recording medium is determined.

During reproduction, after starting reading on the first side of the optical disk recording medium,
It is determined whether or not the reading on the first surface of the optical disc recording medium is normally performed.

Then, when the reading on the first side of the optical disc recording medium is not normally performed, the reading on the second side of the optical disc recording medium is started.

As described above, when the data is read out, the data recorded on the A side 1a is usually read out. However, on the A side 1a, there is a scratch or stain on the surface of the optical disc recording medium 1. When the data cannot be read normally, it is possible to read the normal data by reading the data in the area managed by the same address on the B side 1b.

As described above, according to the optical disk apparatus of the present invention in which the same data is simultaneously recorded on both sides 1a and 1b of the optical disk recording medium 1, since the simultaneous recording is performed, extra labor and time are required. There is an advantage that it does not take.

Further, since data is recorded on each side of one optical disk, there is an advantage that one data is not lost and recording media are not mixed. Host (control side)
Even from the viewpoint, it is possible to obtain the same effect as the backup / mirroring without being aware of the processing work and control.

[0054]

Therefore, as described in detail above, according to the present invention, the same data is simultaneously recorded on both sides of the optical disc recording medium by using the optical disc medium capable of independently recording / reproducing the data on both sides. By doing so, it is possible to provide an optical disk device in which the reliability of data can be easily ensured.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an optical disk drive showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a main part showing a specific example of FIG.

FIG. 3 is a diagram showing address relationships on both sides of an optical disk recording medium used in the present invention.

FIG. 4 is a flowchart showing double-sided simultaneous recording and reading according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Optical disk recording medium, 2 ... Motor, 2a ... Turntable, 3A, 3B ... Optical head, 4A, 4B ... Control part, 5A, 5B ... Data processing part, 6A, 6B ... Memory buffer, 18A ... Motor control part, 23A ... Overall control unit.

Claims (6)

[Claims] 1. A first optical head means and a second optical head means, which are provided to face each surface of an optical disk recording medium capable of recording / reproducing data on both sides, and are the same for the first and second optical head means. Data processing control means for performing data processing and control for simultaneously recording / reproducing the recording data of the recording data on both sides of the optical disc recording medium on a predetermined address, and the data processing control means records the recording data on both sides. Data for reading data on a corresponding address on the other surface of the optical disk recording medium when data on a certain address cannot be read normally when reading data from one surface of the optical disk recording medium An optical disk device characterized by performing processing and control. 2. An optical disk recording medium capable of recording / reproducing data on both sides, the first and second optical head means being provided opposite to each surface, and the same for the first and second optical head means. Data processing control means for performing data processing and control for simultaneously recording / reproducing the recording data of the recording data on both sides of the optical disc recording medium on a predetermined address, and the data processing control means records the recording data on both sides. Data for reading data on a corresponding address on the other surface of the optical disk recording medium when data on a certain address cannot be read normally when reading data from one surface of the optical disk recording medium While performing processing and control, the data processing control means mainly records the recording data on one surface of the optical disc recording medium. The optical disk device according to claim 1, wherein at the same time, data processing and control for backup recording on the other surface are simultaneously performed. 3. An optical disk recording medium capable of recording / reproducing data on both sides, the first optical head means and the second optical head means provided opposite to each surface, and the same optical head means for the first and second optical head means. Data processing control means for performing data processing and control for simultaneously recording / reproducing the recording data of the recording data on both sides of the optical disc recording medium on a predetermined address, and the data processing control means records the recording data on both sides. Data for reading data on a corresponding address on the other surface of the optical disk recording medium when data on a certain address cannot be read normally when reading data from one surface of the optical disk recording medium In addition to performing processing and control, the data processing control means stores the recording data in the same area on both sides of the optical disk recording medium. 3. The optical disk device according to claim 1, wherein the contents are simultaneously recorded while being managed so that the same contents are recorded on the dress. 4. A first and second optical head means provided opposite to each surface of an optical disk recording medium capable of recording data on both sides, and the same recording for the first and second optical head means. An optical disk device comprising: a data processing control means for performing data processing and control for simultaneously recording data on a predetermined address on both sides of the optical disk recording medium. 5. First and second optical head means provided opposite to the first and second surfaces of an optical disk recording medium capable of recording / reproducing data on both sides, and said first and second optical elements. The head means, and data processing control means for performing data processing and control for simultaneously recording / reproducing the same recording data on predetermined addresses on both sides of the optical disc recording medium, the data processing control means comprising: Means for receiving the print data, means for transferring the received print data to a first memory, means for transferring the received print data to a second memory, and transfer to the first memory Means for supplying the recorded data to the first optical head means to start writing on the first surface of the optical disk recording medium; and recording data transferred to the second memory. To the second optical head means to activate writing on the second surface of the optical disk recording medium, means for determining the end of writing on the first surface of the optical disk recording medium, and the optical disk. An optical disc device comprising: means for determining the end of writing on the second surface of the recording medium. 6. A first and a second optical head means provided opposite to each of a first and a second surface of an optical disk recording medium capable of recording / reproducing data on both sides, and said first and second optical elements. The head means, and data processing control means for performing data processing and control for simultaneously recording / reproducing the same recording data on predetermined addresses on both sides of the optical disc recording medium, the data processing control means comprising: Means for receiving the print data, means for transferring the received print data to a first memory, means for transferring the received print data to a second memory, and transfer to the first memory Means for supplying the recorded data to the first optical head means to start writing on the first surface of the optical disk recording medium; and recording data transferred to the second memory. To the second optical head means to activate writing on the second surface of the optical disk recording medium, means for determining the end of writing on the first surface of the optical disk recording medium, and the optical disk. Means for determining the end of writing on the second side of the recording medium, means for activating reading on the first side of the optical disc recording medium, and reading on the first side of the optical disc recording medium are normally performed. And a means for activating the reading on the second side of the optical disc recording medium when the reading on the first side of the optical disc recording medium is not normally performed. An optical disk device characterized by.