JPH1166752A - Optical disk device and memory rearranging circuit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a processing time and reduce an memory capacity by reloading the defective data of the memory address unit with the register storing contents based on a memory storing defective data in order of address containing number data in no particular order, plural registers selectively storing defective data of an arbitrary address, and a comparison result of the storage contents in the registers. SOLUTION: Registers 41, 42 store one unit of defective data read from a defective data table 21a. A register comparison judgement part 43 compares the stored data in the registers 41, 42 and judges which sector number is younger, and outputs the result to a read/write control part 44. The read/write control part 44, based on a rearrangement start signal from a control part and the judgment from the register comparison judgement part 43, starts rearranging the data stored in the defective data table 21a, outputs a control signal to an address generation part 33, and outputs control signals A, B to the registers 41, 42.

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 for recording data on an optical disk and reproducing data recorded on the optical disk, and a memory data rearranging circuit used in the optical disk device.

[0002]

2. Description of the Related Art Conventionally, there has been known an optical disk apparatus that records data on an optical disk having a recording track or reproduces data recorded on the optical disk by using a laser beam output from a semiconductor laser oscillator mounted on an optical head. Has been put to practical use.

In such an optical disk apparatus, defective data or the like corresponding to a defective sector recorded on the optical disk is reproduced and stored in a memory, and the defective sector is used based on the defective data stored in the memory. The data is recorded without any data. The defect data stored in the memory is subjected to a rearrangement process of organizing and storing the defect data in ascending order of the sector numbers so that the CPU of the optical disk device can easily handle the data.

In such a conventional technique, defect data and the like recorded on the optical disk are arranged in ascending order of the sector number. Data was read and stored in another memory for sorting.

In this method, the processing time and the memory capacity for rearranging are increased, and the processing is not efficient. For this reason, reduction in memory capacity, including reduction in processing time, has become an issue.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to reduce the processing time and the memory capacity for rearranging defective data reproduced from an optical disk. It is an object of the present invention to provide an optical disk device and a memory data rearranging circuit capable of shortening the processing time for rearranging and reducing the memory capacity.

[0007]

SUMMARY OF THE INVENTION An optical disk apparatus according to the present invention comprises: a reading means for reading defective data including random number data recorded in a predetermined area of an optical disk; and addressing the defective data read by the reading means to an address. A memory for sequentially storing, a plurality of registers for selectively storing defective data at arbitrary addresses in the memory, a comparing means for comparing the storage contents of the plurality of registers, and a comparison result of the comparing means. Rewriting means for rewriting the defective data in the address unit of the memory with the contents stored in the register.

[0008] The memory data rearranging circuit of the present invention comprises:
A memory for storing defective data including random number data in order of addresses, a plurality of registers for selectively storing defective data at arbitrary addresses in the memory, a comparing means for comparing the stored contents of the plurality of registers, And rewriting means for rewriting defective data in address units of the memory with the contents stored in the register based on the comparison result of the comparing means.

An optical disc apparatus according to the present invention comprises: a reading means for reading defect data including random number data recorded in a predetermined area of an optical disc; a memory for storing defect data read by the reading means in address order;
First and second registers respectively storing defect data including unit number data, number data of defect data stored in the first register, and number data of defect data stored in the second register And determining whether the number data is the same or one of them is larger by storing the defective data read out by the reading means in the memory, and then storing the defective data in an arbitrary address of the memory. Storage means for selectively storing the defect data in the first and second registers; and, after storing the defect data by the storage means, the first or second register is stored in the first or second register based on the determination result by the determination means. Rewriting means for rewriting the defective data in the memory in address units with the stored contents.

[0010] The memory data rearranging circuit of the present invention comprises:
First and second registers each storing defect data including one unit of number data, memory storing defect data at each of a plurality of addresses, number data of defect data stored in the first register Comparing the number data of the defect data stored in the second register with the number data of the defect data stored in the second register to determine whether the number data is the same or one of them is larger. A first storage unit for sequentially storing defect data in random order in the address of the memory, and after the storage of the defect data by the first storage unit, the defect data at an arbitrary address in the memory is selectively stored in the first memory. The second storage means for storing the data in the second register, and after storing the defect data by the second storage means, based on the determination result by the determination means, Serial first, or consists of rewriting means for a storage content of the second register rewrite the defect data of the address unit of the memory.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an optical disk device showing an embodiment of the present invention will be described with reference to the drawings. FIG.
1 shows an optical disk device 10. The optical disk device 10 is an optical disk (DVD-RA) as a recording medium.
M) Recording of data using a focused light for 1;
Alternatively, the recorded data is reproduced.

The optical disk 1 is formed by coating a metal film layer in a donut shape on the surface of a substrate formed in a circle of, for example, glass or plastics.
Data recording or reproduction of recorded data is performed using both concentric or spiral grooves and lands, and in a phase change form where address data is recorded at predetermined intervals by recording marks in a mastering process. This is a rewritable disk.

The optical disk 1 has a lead-in area 2, a data area 3, and a lead-out area 4, as shown in FIGS. Lead-in area 2
Consists of an emboss data zone 5 composed of a plurality of tracks and a rewritable data zone 6 composed of a plurality of tracks. In the emboss data zone 5, reference signals and control data are recorded at the time of manufacturing. The rewritable data zone 6 includes a guard track zone, a disk test zone, a drive test zone, a disk identification data zone, and a defect management zone 6a as a defect management area.

In the defect management zone 6a, 4-byte defect data including the sector number of a defective sector caused by an initial defect or a secondary defect is recorded. In the defect data, a sector number of an alternative sector corresponding to the sector number of the defective sector may be added. The order in which defect data is recorded in the defect management zone 6a is not always in the order of sector numbers.

The initial defect is determined by recording the dummy data at the time of manufacture or at the start of use of the optical disk, and is determined by the number of errors and the number of error lines at the time of reproduction. And the number of error lines.

The data area 3 is composed of a plurality of, for example, 24 zones 3a,. The lead-out area 4 is composed of a plurality of tracks, and is a rewritable data zone, like the rewritable data zone 6, so that the same recorded contents as the data zone 6 can be recorded.

As shown in FIG. 3, the optical disc 1
Data zone 6 and data area 3 which are rewritable with emboss data zone 5 of lead-in area 2 in order from the inside
, 3x, and the data zone of the lead-out area 4, and the clock signal for each zone is the same.
And the number of sectors for each track is different.

In the zones 3a,..., 3x of the data area 3, the number of revolutions (speed) decreases and the number of sectors per track increases from the inner circumference to the outer circumference of the optical disc 1. I have.

The relationship between the speed data as the number of revolutions and the number of sectors per track for each of the zones 3a,... 3x, 4, 5, and 6 is recorded in a correspondence table of the semiconductor memory 21 described later.

.. 3x of the data area 3
As shown in FIGS. 2 and 3, data is recorded in advance in each track in units of ECC (error correction code) block data (for example, 38688 bytes) as a unit of data recording.

Each of the zones 3a,... 3x is composed of a user area and a spare area composed of a substitute sector for a defective sector. The spare area is provided on the outer peripheral side of the corresponding user area.

The ECC block is composed of 16 sectors in which 2K bytes of data are recorded. As shown in FIG. 4, each sector has a 4-byte (32-bit) sector ID (identification data) as address data. ) 1-I
D16 is a 2-byte error detection code (IED: I
D error detection code) along with a horizontal ECC (error correction code) 1 and a vertical ECC 2 as an error correction code for reproducing data recorded in an ECC block. It is to be recorded. This ECC
Numerals 1 and 2 are error correction codes added to data as redundant words in order to prevent data from being unable to be reproduced due to a defect of the optical disk 1.

Each sector is composed of 12 rows of data of 172 bytes, and a horizontal ECC 1 of 10 bytes is provided for each row, and a vertical ECC 2 of one row of 182 bytes is provided for each row. Have been. As a result, the error correction circuit 32, which will be described later,
The error correction process for each line is performed using C1, and the error correction process is performed for each column using ECC2 in the vertical direction.

When the ECC block is recorded on the optical disk 1, as shown in FIG. 5, data is written for each predetermined data amount (each predetermined data length interval, for example, 91 bytes: 1456 channel bits) in each sector. Synchronization code (2 bytes: 3
2 channel bits).

As shown in FIG. 6, each sector is composed of 26 frames from the 0th frame to the 25th frame, and the synchronization code (frame synchronization signal) assigned to each frame indicates the frame number. Specific code for specifying (1 byte: 16 channel bits) and common code common to each frame (1 byte: 16 channel bits)
It is composed of

That is, as shown in FIG. 6, the zeroth frame is SY0, the second, tenth, and eighteenth frames are SY1,
The fourth, twelfth and twentieth frames are SY2, sixth and first frames.
The 4th and 22nd frames are SY3, the 8th, 16th and 24th frames are SY4, the 1st, 3rd, 5th, 7th and 9th frames are SY5, the 11th, 13th, 15th and 17th frames Is SY6, and the 19th, 21st, 23rd, and 25th frames are SY7.

.. 3x of the data area 3
As shown in FIG. 2, each track has
A header section 11 in which addresses and the like are recorded, respectively.
Are pre-formatted in advance.

The format for each sector is shown in FIG.
Is shown in In FIG. 7, one sector is 2697
It is composed of 128 bytes of header area (corresponding to the header part 11), 2 bytes of mirror area 7, and 2567 bytes of recording area 8.

The channel bits recorded in the sector have a format in which 8-bit data is modulated into 16-bit channel bits by 8-16 code. The header area 11 is an area where predetermined data is recorded when the optical disc 1 is manufactured. This header area 11
It is composed of four header 1 areas, two header areas, three header areas, and four header areas.

The header 1 area to the header 4 area are composed of 46 bytes or 18 bytes, and a 36-byte or 8-byte synchronization code part VFO (Variable Frequency O).
scillator), 3-byte address mark AM (Addres
s Mark), 4-byte address part PID (Position Ide)
ntifier), 2-byte error detection code IED (ID Err
or Detection Code) 1 byte postamble PA
(Postambles).

Further, an optical disk device 10 will be described with reference to FIG.
Will be described. Basic Functions of Optical Disc Apparatus 10 In the optical disc apparatus 10, new data is recorded or rewritten (including data erasure) using a converging spot at a predetermined position on the optical disc 1.

Further, the optical disk device 10 reproduces the already recorded data from a predetermined position on the optical disk 1 by using a converging spot. Means for Achieving Basic Functions of Optical Disk Apparatus 10 As means for achieving the above basic functions, the optical disk apparatus 1
At 0, there are the following three points.

The focused spot is traced (followed) along a track (not shown) on the optical disc 1.
The recording / reproducing / erasing of data is switched by changing the light amount of the converging spot irradiated on the optical disc 1.

The recording signal d supplied from the outside is converted into an optimum signal for recording at a high density and a low error rate. Signal Detection by Optical Head 12 The optical head 12 basically includes a semiconductor laser element as a light source, a photodetector, and an objective lens, not shown.

The laser light emitted from the semiconductor laser device is focused on the optical disk 1 by the objective lens. The laser light reflected by the light reflection film or the light reflection recording film of the optical disc 1 is photoelectrically converted by a photodetector.

The detection current obtained by the photodetector is
The current-to-voltage conversion results in a detection signal. This detection signal is processed by the focus / track error detection circuit 14 or the binarization circuit 15. Generally, a photodetector is divided into a plurality of photodetection areas, and individually detects a change in the amount of light applied to each photodetection area. The focus / track error detection circuit 14 calculates the sum / difference of the individual detection signals to detect a focus shift and a track shift. A signal on the optical disk 1 is reproduced by detecting a change in the amount of light reflected from the light reflecting film or the light reflective recording film of the optical disk 1.

Defocus Detection Method As a method of optically detecting the amount of defocus, there is an astigmatism method or a knife edge method.

In the astigmatism method, an optical element (not shown) for generating astigmatism is arranged in a detection optical path of laser light reflected by a light reflection film or a light reflection recording film of the optical disk 1, and light detection is performed. A method for detecting a change in the shape of laser light applied to a vessel. The light detection area is divided into four diagonally.
Focusing on the detection signal obtained from each detection area
The difference between the diagonal sums is obtained in the track error detection circuit 14 to obtain a focus error detection signal.

The knife edge method is a method of disposing a knife edge that asymmetrically shields a part of a laser beam reflected by the optical disk 1. The light detection area is divided into two parts, and a difference between detection signals obtained from each detection area is obtained to obtain a focus error detection signal.

Track deviation detection method The optical disc 1 has spiral or concentric tracks, and data is recorded on the tracks. Data is reproduced or recorded / erased by tracing the focused spot along the track. In order to stably trace the focused spot along the track, it is necessary to optically detect the relative displacement between the track and the focused spot.

As a method of detecting track deviation, generally, D
There are a PD (Differential Phase Detection) method, a push-pull method, and a twin-spot method.
The DPD method detects a change in intensity distribution of a laser beam reflected by a light reflection film or a light reflection recording film of the optical disc 1 on a photodetector. The light detection area is divided into four diagonally. The difference between the diagonal sums of the detection signals obtained from the respective detection areas in the focus / track error detection circuit 14 is obtained to obtain a track error detection signal.

The push-pull method detects a change in intensity distribution of a laser beam reflected by the optical disk 1 on a photodetector. The light detection area is divided into two parts, and a track error detection signal is obtained by taking the difference between the detection signals obtained from each detection area.

In the twin-spot method, a diffractive element or the like is arranged in a light transmission system between the semiconductor laser element and the optical disk 1 to divide the light into a plurality of wavefronts, and a change in the amount of reflected ± 1st-order diffracted light applied to the optical disk 1 Is detected. A light detection area for individually detecting the reflected light amount of the + 1st-order diffracted light and the reflected light amount of the -1st-order diffracted light is arranged separately from the light detection area for detecting the reproduction signal. Get.

Objective Lens Actuator Structure An objective lens (not shown) for focusing the laser light emitted from the semiconductor laser element on the optical disk 1 moves in two axial directions according to the output current of the objective lens actuator drive circuit 16. It has a possible structure. The moving direction of the objective lens is determined by the optical disc 1
, And in the radial direction of the optical disc 1 for track deviation correction. Although not shown, the moving mechanism of the objective lens is called an objective lens actuator.

As the objective lens actuator structure,
A shaft sliding method or a four-wire method is often used. Both types have a structure in which a permanent magnet and a coil are provided, and the blade is moved by passing a current through a coil connected to the blade.

The axis sliding method is a method in which a blade integrated with the objective lens moves along a central axis (shaft). The blade moves in a direction along the central axis to perform defocus correction, and moves the central axis. This is a method in which track deviation is corrected by the rotation of the blade as a reference.

In the four-wire system, a blade integrated with an objective lens is connected to a fixed system by four wires.
This is a method of moving a blade in two axial directions by utilizing elastic deformation of wires.

Rotation control system of optical disk 1 The optical disk 1 is mounted on a rotating table 18 which is rotated by the driving force of a spindle motor 17.

The rotation speed of the optical disk 1 is detected based on a reproduction signal obtained from the optical disk 1. That is, the amplifier 1
The three-output detection signal (analog signal) is converted into a digital signal by the binarization circuit 15, and this signal is converted into a PLL circuit 19
Generates a constant period signal (reference clock signal). The rotation speed detection circuit 20 detects the number of rotations of the optical disc 1 using this signal and outputs the value.

A correspondence table of the number of rotations corresponding to the radial position to be reproduced or recorded / erased on the optical disk 1 is recorded in the semiconductor memory 21 in advance. When the reproducing position or the recording / erasing position is determined, the control unit 22 sets the target rotation speed of the optical disc 1 with reference to the data in the semiconductor memory 21 and notifies the spindle motor driving circuit 23 of the value.

The spindle motor drive circuit 23 calculates the difference between the target rotation speed and the output signal of the rotation speed detection circuit 20 (current rotation speed), and supplies a drive current according to the result to the spindle motor 17. Control is performed so that the rotation speed of the spindle motor 17 is constant. The output signal of the rotation speed detection circuit 20 is a pulse signal having a frequency corresponding to the rotation speed of the optical disc 1,
In 3, control is performed on both the frequency and the pulse phase of this signal.

Optical Head Moving Mechanism An optical head moving mechanism (feed motor) 24 for moving the optical head 12 in the radial direction of the optical disk 1 is provided.

In many cases, a rod-shaped guide shaft is used as a guide mechanism for moving the optical head 12, and the optical head 12 is moved by utilizing friction between the guide shaft and a bush attached to a part of the optical head 12. I do. In addition, there is a method of using a bearing in which a frictional force is reduced by using a rotary motion.

Although a driving force transmitting method for moving the optical head 12 is not shown, a rotating motor having a pinion (rotating gear) is arranged in a fixed system, and a rack, which is a linear gear meshing with the pinion, is attached to the optical head 12. And converts the rotary motion of the rotary motor into a linear motion of the optical head 12. As another driving force transmission method, a linear motor system in which a permanent magnet is arranged in a fixed system and current flows in a coil arranged in the optical head 12 to move the coil in a linear direction may be used.

In both the rotary motor and the linear motor, basically, a current is supplied to the feed motor to
A driving force for movement is generated. This drive current is supplied from the feed motor drive circuit 25.

Focused Spot Trace Control In order to perform focus shift correction or track shift correction, an objective lens actuator (not shown) in the optical head 12 according to an output signal (detection signal) of the focus / track error detection circuit 14. The objective lens actuator drive circuit 16 supplies a drive current to the actuator.
A phase compensating circuit for improving characteristics in accordance with the frequency characteristics of the objective lens actuator is provided inside in order to make the movement of the objective lens respond quickly at a high frequency range.

The objective lens actuator drive circuit 16 turns on / off the focus / track deviation correction operation (focus / track loop) in accordance with a command from the control unit 22, and moves the objective lens in the vertical direction (focus direction) of the optical disk 1. A process of moving at a low speed (executed when the focus / track loop is off) and a process of moving the focused spot to an adjacent track by slightly moving the optical disc 1 in a radial direction (a direction crossing the track) using a kick pulse. .

Switching of laser light quantity for reproduction and recording / erasing Switching between reproduction and recording / erasing is performed by changing the light quantity of a condensed spot irradiated onto the optical disc 1.

For the optical disk 1 using the phase change method, generally, the relationship of [light amount at the time of recording]> [light amount at the time of erasing]> [light amount at the time of reproduction] holds, and the optical disk using the magneto-optical method In general, there is a relationship of [light quantity at the time of recording] [light quantity at the time of erasing]> [light quantity at the time of reproduction] for 1. In the case of the magneto-optical method, the recording and erasing processes are controlled by changing the polarity of an external magnetic field (not shown) applied to the optical disk 1 during recording / erasing.

At the time of data reproduction, the optical disk 1 is continuously irradiated with a constant light amount. When recording new data, a pulsed intermittent light amount is added to the light amount at the time of reproduction. When the semiconductor laser element emits a pulse with a large amount of light, the light-reflective recording film of the optical disk 1 locally undergoes an optical change or shape change, and a recording mark is formed. Similarly, when overwriting an area already recorded, the semiconductor laser element is caused to emit pulse light.

When erasing already recorded data, a constant light amount larger than that at the time of reproduction is continuously irradiated.
In the case where data is continuously erased, the irradiation light amount is returned at the time of reproduction in a specific cycle such as a sector unit, and data is intermittently reproduced in parallel with the erasing process. The track number and address of the track to be intermittently erased are reproduced, and the erasing process is performed while confirming that there is no error in the erased track.

Laser Light Emission Control Although not shown, the optical head 12 has a built-in photodetector for detecting the light emission amount of the semiconductor laser element. The semiconductor laser driving circuit 26 calculates the difference between the photodetector output (detection signal of the light emission amount of the semiconductor laser element) and the light emission reference signal given from the recording / reproducing / erasing control waveform generation circuit 27, and based on the result, The drive current to the laser is fed back.

Activation Control When the optical disk 1 is mounted on the turntable 18 and activation control is started, processing is performed according to the following procedure. 1) The target rotation speed is transmitted from the control unit 22 to the spindle motor drive circuit 23, and a drive current is supplied from the spindle motor drive circuit 23 to the spindle motor 17, so that the spindle motor 17 starts rotating. 2) At the same time, a command (execution command) is issued from the control unit 22 to the feed motor drive circuit 25, and a drive current is supplied from the feed motor drive circuit 25 to the optical head drive mechanism (feed motor) 24 so that the optical head 12 The optical disk 1 moves to the innermost position. It is confirmed that the optical head 12 is located further inward of the optical disk 1 than the area where the data is recorded. 3) When the spindle motor 17 reaches the target rotation speed,
The status (status report) is sent to the control unit 22. 4) A current is supplied from the semiconductor laser driving circuit 26 to the semiconductor laser element in the optical head 12 according to the reproduced light amount signal sent from the control unit 22 to the recording / reproducing / erasing control waveform generation circuit 27, and laser emission is started. I do.

The optimum irradiation light amount at the time of reproduction differs depending on the type of the optical disk 1. At the time of startup, it is set to the value with the lowest irradiation light amount. 5) The optical head 12 according to a command from the control unit 22
The objective lens (not shown) is shifted to the position farthest from the optical disc 1 and the objective lens actuator drive circuit 16 controls the objective lens to approach the optical disc 1 slowly. 6) At the same time, the focus / track error detection circuit 14 monitors the amount of defocus, and outputs a status to the control unit 22 when the objective lens comes near the focused position. 7) Upon receiving the notification, the control unit 22 issues a command to the objective lens actuator drive circuit 16 to turn on the focus loop. 8) The control unit 22 issues a command to the feed motor drive circuit 25 while keeping the focus loop on, and
2 is slowly moved toward the outer peripheral portion of the optical disc 1. 9) At the same time, monitor the reproduction signal from the optical head 12,
When the optical head 12 reaches the recording area on the optical disc 1, the movement of the optical head 12 is stopped, and a command to turn on the track loop is issued to the objective lens actuator drive circuit 16. 10) Reproduce the “optimum light quantity at the time of reproduction” and “optimum light quantity at the time of recording / erasing” recorded on the inner peripheral portion of the optical disc 1,
The data is recorded in the semiconductor memory 21 via the control unit 22. 11) Further, the control unit 22 sets the "optimum light amount during reproduction".
Recording / reproducing / erasing control waveform generation circuit 2
7, the light emission amount of the semiconductor laser element at the time of reproduction is reset. 12) The light emission amount of the semiconductor laser element at the time of recording / erasing is set according to the “optimum light amount at the time of recording / erasing” recorded on the optical disc 1.

Reproduction of Access Destination Data on Optical Disk 1 Data on what kind of data is recorded at which location on optical disk 1 differs depending on the type of optical disk 1. Recorded in the directory management area or the navigation pack.

The directory management area is recorded collectively in the inner circumference area or the outer circumference area of the optical disc 1.
The navigation pack is included in a VOBS (Video Object Set) conforming to the data structure of the PS (Program Stream) of MPEG2, and records data on where the next video is recorded.

When it is desired to reproduce or record / delete specific data, the data in the above-mentioned area is reproduced first, and the access destination is determined from the obtained data. Rough access control The control unit 22 calculates the radius position of the access destination by calculation, and calculates the distance from the current position of the optical head 12.

The speed curve data which can be reached in the shortest time with respect to the moving distance of the optical head 12 is recorded in the semiconductor memory 21 in advance. The control unit 22 reads the data and controls the movement of the optical head 12 according to the speed curve in the following manner.

After the control unit 22 issues a command to the objective lens actuator drive circuit 16 to turn off the track loop, the feed motor drive circuit 25 is controlled to start the movement of the optical head 12.

When the focused spot crosses a track on the optical disc 1, the focus / track error detection circuit 14
A track error detection signal is generated within the frame. Using this track error detection signal, the relative speed of the focused spot with respect to the optical disc 1 can be detected.

The feed motor drive circuit 25 calculates the difference between the relative speed of the condensed spot obtained from the focus / track error detection circuit 14 and the target speed data sent one by one from the control unit 22, and uses the result as an optical head. The optical head 12 is moved while applying feedback to the drive current to the drive mechanism (feed motor) 24.

As described in the above "optical head moving mechanism", frictional force always acts between the guide shaft and the bush or bearing. When the optical head 12 is moving at high speed, kinetic friction acts. However, at the start of movement and immediately before the stop, static friction acts because the moving speed of the optical head 12 is slow. At this time, since the relative frictional force has increased (particularly immediately before the stop), the amplification factor (gain) of the current supplied to the optical head drive mechanism (feed motor) 24 in response to a command from the control unit 22 is increased. .

Fine Access Control When the optical head 12 reaches the target position, the control unit 22 issues a command to the objective lens actuator drive circuit 16 to turn on the track loop.

The focused spot reproduces the address or track number of that portion while tracing along the track on the optical disc 1. The current focused spot position is calculated from the address or the track number, the number of error tracks from the target position is calculated in the control unit 22, and the number of tracks required for moving the focused spot is determined by the objective lens actuator drive circuit 16. Notify.

When one set of kick pulses is generated in the objective lens actuator drive circuit 16, the objective lens slightly moves in the radial direction of the optical disk 1, and the focused spot moves to an adjacent track.

The track loop is temporarily turned off in the objective lens actuator drive circuit 16, a kick pulse is generated a number of times corresponding to the data from the control unit 22, and then the track loop is turned on again.

After the end of the fine access, the control unit 22 reproduces the data (address or track number) at the position traced by the focused spot and confirms that the target track is being accessed.

Continuous Recording / Reproduction / Erase Control A track error detection signal output from the focus / track error detection circuit 14 is input to a feed motor drive circuit 25. The control unit 22 controls the feed motor drive circuit 25 so as not to use the track error detection signal during the “start control” and the “access control” described above.

After confirming that the focused spot has reached the target track by the access, a part of the track error detection signal is transmitted by the command from the control unit 22 via the feed motor drive circuit 25 to the optical head drive mechanism (feed Motor 24). This control is continued during the period in which the reproduction or the recording / erasing process is continuously performed.

The center position of the optical disk 1 is
8 is mounted with an eccentricity slightly shifted from the center position. When a part of the track error detection signal is supplied as a drive current, the entire optical head 12 slightly moves in accordance with the eccentricity.

When the reproduction or recording / erasing process is performed continuously for a long time, the position of the focused spot gradually moves in the outer circumferential direction or the inner circumferential direction. When a part of the track error detection signal is supplied as a drive current to the optical head moving mechanism (feed motor) 24, the optical head 12 gradually moves in the outer circumferential direction or the inner circumferential direction accordingly.

In this way, the burden of correcting the track shift of the objective lens actuator can be reduced, and the track loop can be stabilized. Termination Control When a series of processing is completed and the operation is terminated, the processing is performed according to the following procedure. 1) The control unit 22 issues a command to the objective lens actuator drive circuit 16 to turn off the track loop. 2) The control unit 22 issues a command to the objective lens actuator drive circuit 16 to turn off the focus loop. 3) The control unit 22 issues a command to the recording / reproduction / erase control waveform generation circuit 27 to stop light emission of the semiconductor laser device. 4) Notify the spindle motor drive circuit 23 of 0 as the reference rotation speed.

Signal Format Recorded on Optical Disk 1 For a signal recorded on optical disk 1, (1) correction of a recording data error caused by a defect on optical disk 1 is enabled (2) DC component of reproduced signal (3) In order to satisfy the requirement of recording data on the optical disc 1 as high density as possible, the optical disc apparatus 10 needs to add “error correction function”, “record data”. Signal conversion (modulation / demodulation of a signal).

ECC (Error Correction Code) Addition Processing Data to be recorded on the optical disc 1 is input to the data input / output interface unit 30 as a recording signal d in the form of a raw signal. This recording signal d is recorded in the semiconductor memory 21 as it is, and then the ECC encoding circuit 29 performs the following ECC addition processing.

An embodiment of an ECC adding method using a product code will be described below. The recording signal d is stored in the semiconductor memory 21
One line at a time every 172 bytes in the
A set of ECC blocks. This "row: 172 x column: 1
For each raw signal (recording signal d) in a set of ECC blocks consisting of
The inner code PI of 0 bytes is calculated and additionally recorded in the semiconductor memory 21. Further, a 16-byte outer code PO is calculated for each column in byte units and additionally recorded in the semiconductor memory 21.

As an embodiment for recording on the optical disc 1, a total of 23 lines including 12 lines including the inner code PI and 1 line for the outer code PO
It is recorded in one sector of the optical disc 1 in units of 66 bytes (2366 = (12 + 1) × (172 + 10)).

When the addition of the inner code PI and the outer code PO is completed in the ECC encoding circuit 29, the one-sector sector 2366 reads a byte-by-byte signal from the semiconductor memory 21 and transfers it to the modulation circuit 28.

Signal modulation DC component of reproduction signal (DSV: Digital Sum Value)
Is approached 0, and signal modulation, which is a conversion of the signal format, is performed in the modulation circuit 28 in order to record data on the optical disc 1 at high density.

A conversion table indicating the relationship between the original signal and the modulated signal is provided in the modulation circuit 28 and the demodulation circuit 31. The signal transferred from the ECC encoding circuit 29 is divided into a plurality of bits according to the modulation method, and converted into another signal (code) while referring to a conversion table.

For example, 8/16 modulation (R
When the LL (2, 10) code is used, there are two types of conversion tables, and the DC component (DSV: Dis
The reference conversion table is switched one by one so that italSum Value) approaches zero.

Recording Waveform Generation When recording a recording mark on the optical disk 1, a recording method is generally as follows: mark length recording method: "1" comes at the front end position and the rear terminal position of the recording mark. And ○ mark recording method: the center position of the recording mark matches the position of “1”. There are two types.

When mark length recording is performed, it is necessary to form a long recording mark. In this case, if the recording light amount is continuously irradiated for a certain period, a "raindrop" recording mark having a wide width only at the rear portion is formed due to the heat storage effect of the light reflective recording film of the optical disk 1. In order to eliminate this adverse effect, when forming a long recording mark, the recording mark is divided into a plurality of recording pulses or the recording waveform is changed stepwise.

In the recording / reproducing / erasing control waveform generating circuit 27, the above-mentioned recording waveform is created in accordance with the recording signal sent from the modulation circuit 28, and the semiconductor laser driving circuit 2
6.

Binarization / PLL Circuit As described in "Signal Detection by Optical Head", a signal on the optical disk 1 is reproduced by detecting a change in the amount of light reflected from the light reflecting film or the light reflective recording film of the optical disk 1. . The signal obtained by the amplifier 13 has an analog waveform. 2
The value conversion circuit 15 converts the signal into a binary digital signal consisting of "1" and "0" using a comparator.

A reference signal at the time of data reproduction is extracted by the PLL circuit 19 from the obtained reproduction signal. PL
The L circuit 19 has a built-in variable frequency oscillator. The pulse signal (reference clock) output from the oscillator and 2
Compare the frequency and phase between the output signals of the digitizing circuit 15,
The result is fed back to the oscillator output.

Demodulation of Signal The demodulation circuit 31 has a conversion table indicating the relationship between the modulated signal and the demodulated signal. The signal is returned to the original signal while referring to the conversion table in accordance with the reference clock obtained by the PLL circuit 19. The returned (demodulated) signal is recorded in the semiconductor memory 21.

Error Correction Processing The signal stored in the semiconductor memory 21 is subjected to an inner code PI
The error correction circuit 32 detects the error location using the outer code PO and sets an error location pointer flag.

Thereafter, while reading the signal from the semiconductor memory 21, the signal at the error location is sequentially corrected in accordance with the error pointer flag, and the inner code PI and the outer code PO are removed and transferred to the data input / output interface unit 30.

The signal sent from the ECC encoding circuit 29 is output from the data input / output interface unit 30 as a reproduction signal c. The semiconductor memory 21 is provided with a defect data table 21a for storing defect data recorded in the defect management zone 6a of the optical disc 1. In this defect data table 21a,
When the optical disk 1 is loaded into the optical disk device 10, the defect data recorded in the defect management zone 6a of the optical disk 1 is reproduced and stored.

The defect data reproduced from the defect management zone 6a is temporarily stored as it is based on the addresses sequentially generated from the address generation unit 33, and thereafter, the addresses sequentially generated from the address generation unit 33 and the rearrangement processing unit Based on the control of 34, a rearrangement process for rearranging the sectors in ascending order of the sector numbers is performed.

When the optical disc 1 is loaded, the control section 22 controls the above sections to reproduce the defect data recorded in the defect management zone 6a of the optical disc 1 and reproduces the defect data demodulated by the demodulation circuit 3 into the defect data. The data is supplied to the semiconductor memory 21 in a format to be written in the table 21a. At this time, the control unit 22 sends a signal to the address generation unit 33 to start address generation. Further, when the control unit 22 finishes writing the defect data recorded in the defect management zone 6a of the optical disc 1 to the defect data table 21a, the control unit 22 sends a rearrangement start signal to a read / write control described later. The power is supplied to the section 44.

The address generation unit 33 specifies the writing position of the defect data table 21a of the semiconductor memory 21 by counting up each time one unit of reproduced defect data (4 bytes) is supplied to the semiconductor memory 21. Address to be generated.

When performing the reordering process of the defect data, the address generating unit 33 reads the defect data table 21a of the semiconductor memory 21 in accordance with a control signal from a read / write control unit 44 described later, or An address for designating a write position is generated. That is, N = N + 1 and M = M in FIG.
The processing operation corresponding to +1 is performed.

As shown in FIG. 8, the rearrangement processing section 34 includes a register 41, a register 42, a register comparison / determination section 43, and a read / write control section 44.

Each of the registers 41 and 42 is a 4-byte register. One unit of defect data read from the defect data table 21a of the semiconductor memory 21 based on a control signal from the read / write control unit 44. Is stored in the defect data table 21 of the semiconductor memory 21.
a, which is output to the register comparison / determination unit 43.

The register comparison / judgment section 43 includes a register 41
Is compared with the defective data in the register 42 to determine which sector number is younger. A determination signal as a result of this determination is output to the read / write controller 44. It has become.

The read / write control unit 44 controls the semiconductor memory 2 based on the rearrangement start signal from the control unit 22 and the determination result from the register comparison determination unit 43.
1 starts the operation of rearranging the data stored in the defective data table 21a, outputs a read / write signal to the defective data table 21a of the semiconductor memory 21, outputs a control signal to the address generator 33, and , 42 also have control signals A, B, respectively.
Is output.

The control signal A in the configuration of FIG. 8 corresponds to (1) and (4) of the operation defect data table 2 in FIGS.
Control of reading from the register 1a to the register 41 and writing from the register 41 of (3) operation to the defect data table 21a are performed. The control signal B is shown in FIGS.
It controls (2) reading from the operation defect data table 21a to the register 42, and (5) writing from the operation register 42 to the defect data table 21a.

Next, in the above configuration, the defect data table 21 is created by using the two registers 41 and 42.
The rearrangement of the defect data stored in “a” will be described with reference to a defect data rearrangement processing routine (register read / write procedure) shown in FIGS. 9 and 10 and a flowchart shown in FIG.

In this case, the data rearrangement will be described on the assumption that the memory Nos. R1 to R13 of the defect data table 21a contain the defect data reproduced from the defect management area of the optical disk 1.

Originally, the data processing is started from the memory No. R2. However, the operation shown in FIGS. 9 and 10 for explanation is such that the defective data in the memory No.
This is the processing operation when it is assumed that the data value becomes the third data value.

In the processing procedure, after the defective data of the memory No. and R12 are stored in the register 41, the defective data of the memory No. and R1 are stored in the register 42 and compared with the defective data of the register 41. As a result of the comparison, if the register 41 is larger than the register 42, the defective data in the memory No. R2 is replaced with the register 42 and the data is compared with the register 41 again. The defective data of the memory No. R3 is stored in the register 42.
When the data is compared with the register 41,
<By becoming the register 42, the defective data of the register 41 is overwritten on the memory No. R3. After the overwriting, the memory numbers R4 and R4 are replaced in the register 41, and the defective data in the memory No. R4 and the defective data in the memory numbers R5 after the overwriting are stored in the register 42. Next, after the defective data of the register 41 is overwritten on the memory No. R5, the data of the memory No. R6 is put into the register 41. This time, the memory No., R6, N
The overwriting and reading of o and 7 are performed, and the register 41 and the register 42 are alternately overwritten and read to the defect data table 21a, and the defect data of the defect data table 21a is moved to the next higher address. Perform data shift processing.

After the end of the data shift processing, the next memory N
o, the defective data of R13 is stored in the register 41, and the defective data of the memory No. R1 is stored in the register 42 as in the above-described processing. , 13 are searched, and data shift processing in the defect data table 21a is performed.

If the address (memory No., R12) of the defect data table 21a first entered in the register 41,
If the result of the data comparison becomes register 41> register 42, the address is not overwritten by the data in the register 41, and the defective data at the next updated address is replaced by the register 41. Data comparison processing from No and R1 is performed. After such defective data rearrangement processing is performed up to the last data of the defective data, the data rearrangement processing ends.

The last data of the defective data is preset as the maximum memory No. by checking the last position beforehand (by a counter or the like) before rearrangement. In the flowchart shown in FIG. 11, the maximum memory No = NE; the last memory number of the defect data table.

The main part of the flow chart shown in FIG. 11 will be described. That is, when the rearrangement start signal is input, the read / write control unit 44 starts the operation of rearranging the defect data stored in the defect data table 21a.

First, a read signal is output to the defect data table 21a, data is input to the register 41 / register 42 for the defect in the defect data table 21a, and the corresponding operation of the judgment portion in FIG. The read / write control unit 44 determines from the register 41 in FIG.
(N), register 41 ← memory No, R (N), register 42 → memory No, R (N), register 42 ← read / write to control operations corresponding to memory No, R (N) By issuing a signal, the data of the register 41 and the register 42 are written into the defect data table 21a, and the data is taken into the register 41 or the register 42 from the defect data table 21a.

In the above description of operation, register 41 and register 4
In the data comparison of No. 2, the address of the defective data from the defective data table 21a stored in the register 41 (memory N
(o, R12) The location corresponding to the case where the result of the data comparison becomes register 41> register 42 is register 41 = register 42 upon detection of data comparison. This is because the address of the defective data (memory No., R12) from the defective data table 21a stored in the register 41 is stored in the register 42.
This is because the result is obtained by reaching the search data to be entered.

In the above-described embodiment, in order to detect the position of the last No. in the memory area containing the defective data, the last position is checked before sorting and preset as the maximum memory No. However, the present invention is not limited to this, and a value (all 1) that does not exist as pre-specified defect data is written to the next data after the defect data, and the data rearrangement process is terminated by detecting the data. To

In this case, the portion of EN = M in the flowchart is the data NDD = register 42 or NDD = register 41 that does not exist as the defect data. (FIG. 12
In the above embodiment, the register 41 and the register 4
2 is compared with all the data of 4 bytes.
The comparison of the data except for a part of the data put in 2 may be performed.

In this case, as shown in FIG.
The bytes are compared, and the registers 41 and 42 have a 3-byte configuration. As described above, the optical disk 1 has the register 41 / register 42 composed of a plurality of bytes (4 bytes).
Is stored in a defect data table 21a (semiconductor memory 21) in order to sort defect data and the like recorded in the defect data area 6a in the
The defect data in a is entered in the register 41 as defect data to be sequentially entered in the defect data table 21a from a pre-designated address (address value next to the minimum value in the designated area: No, R2), The register 42 fetches data in order from the beginning of the defect data table 21a and searches for the position where the defect data is to be inserted into the defect data table 21a, and compares the data with the defect data of the register 41 every time data is once entered into the register 41. To go. As a result of the comparison, when the sector value of the defective data of the register 41 becomes smaller than the sector value of the defective data of the register 42 (register 41 <register 42), the address of the defective data in the defective data table 21a taken into the register 42 After overwriting the defect data in the register 41, the next defect data to be inserted into the defect data table 21a is input into the register 41, and the next defect data is compared with the register 42 and overwritten on the defect data table 21a. The defect data at the maximum address in the defect data table 21a area where the defect data is stored is stored in the register 41 and data comparison is performed until the overwriting is performed. The data is arranged from the smallest address in the designated block in ascending order of the data value. It is characterized by performing replacement.

As a result, since the rearrangement process is performed on the defect data table of the semiconductor memory in which the defect data has been stored, it is not necessary to have another memory for rearrangement, and furthermore, it is necessary to generate an address for another memory operation. Since the processing is eliminated and the data is moved in the data processing by one-step shift operation, the operation becomes easy and the time required for the rearrangement processing can be reduced.

[0123]

As described above in detail, according to the present invention, an optical disk apparatus and a memory data rearranging circuit capable of shortening the processing time for rearranging defective data reproduced from an optical disk and reducing the memory capacity are provided. It is intended to be.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing a schematic configuration of an optical disc.

FIG. 3 is a diagram showing a schematic configuration of an optical disc.

FIG. 4 is a diagram for explaining a configuration of an ECC block of the optical disc.

FIG. 5 is a diagram for explaining a configuration of an ECC block of the optical disc.

FIG. 6 is a diagram for explaining a configuration of each sector of an ECC block.

FIG. 7 is a diagram showing a sector format of an ECC block.

FIG. 8 is a block diagram for explaining a rearrangement processing unit and its peripheral circuits.

FIG. 9 is a view for explaining a defect data rearrangement processing routine;

FIG. 10 is a view for explaining a defect data rearrangement processing routine;

FIG. 11 is a flowchart illustrating a defect data rearranging process.

FIG. 12 is a flowchart illustrating a defect data rearranging process.

FIG. 13 is a view for explaining a defect data rearrangement processing routine;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk 10 ... Optical disk apparatus 21 ... Semiconductor memory 21a ... Defect data table 22 ... Control part 33 ... Address generation part 34 ... Rearrangement processing part 41, 42 ... Register 43 ... Register comparison determination part 44 ... Defect data table

Claims (4)

[Claims] 1. A reading means for reading defect data including random number data recorded in a predetermined area of an optical disk, a memory for storing defect data read by the reading means in address order, and an optional memory of the memory. A plurality of registers each of which selectively stores defect data of the address; a comparing means for comparing the stored contents of the plurality of registers; and Rewriting means for rewriting defect data in address units. 2. A memory for storing defective data including random number data in order of addresses, a plurality of registers for selectively storing defective data at an arbitrary address of the memory, and storing the plurality of registers. A sequence of memory data, comprising: comparing means for comparing contents; and rewriting means for rewriting defective data in address units of the memory with the contents stored in the register based on a comparison result of the comparing means. Replacement circuit. 3. A reading means for reading defect data including random number data recorded in a predetermined area of an optical disk, a memory for storing defect data read by the reading means in address order, a unit number First and second registers respectively storing defect data including data; number data of defect data stored in the first register; and number data of defect data stored in the second register. Comparing means for judging that the number data is the same or one of them is larger; and storing the defective data read by the reading means in the memory, and then determining whether the defect data at an arbitrary address in the memory is sufficient. A storage unit for selectively storing data in the first and second registers; and a storage unit for storing the defect data by the storage unit. That determination based on the result of the optical disk apparatus characterized by comprising a rewriting means for rewriting the defect data of the address unit of the memory in the storage contents of said first or second register. 4. A first and a second register for storing defect data including one unit of number data, a memory for storing defect data at each of a plurality of addresses, and a storage for the first register. Comparing the number data of the defect data with the number data of the defect data stored in the second register to determine whether the number data is the same or any one of them is larger; Storage means for sequentially storing defect data in the order of the number data supplied from the memory in the order of addresses of the memory; after the storage of the defect data by the first storage means, a defect at an arbitrary address of the memory A second storage unit for selectively storing data in the first and second registers; and a storage unit for storing the defect data by the second storage unit. That the judgment result of the first on the basis of, or the second register rearrangement circuit of the memory data, characterized by comprising a rewriting means for rewriting the defect data of the address unit of the memory in the storage content, a.