JPH11126436A - Recording data to be reproduced and reproducing device, and therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable reproduction of desired data to be reproduced, even in the case where control information has not been normally written by providing in a user control area an additional information area indicating the failure of normal writing of the control information. SOLUTION: The information recording medium 101 is provided with UTOC area, which is a user control area following PTOC area, in the read-in area in the innermost circumference, and user control information necessary for reproduction is written in when data to be reproduced is recorded. In the case where the user control information is not correctly written in UTOC area, the failure is detected, with a flag forming circuit 301 forming an error flag. A special area is provided for the error flag in UTOC area, or a special memory 304 is provided in the cartridge 303 of the information recording medium 101, with the error flag written in there. If the error flag is detected at the time of reproduction, the head of the data to be reproduced is accessed to start the reproduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reproduced data recording / reproducing apparatus and a medium for recording or reproducing reproduced data such as video data or audio data.

[0002]

2. Description of the Related Art As a conventional example of the present invention, a mini disk system will be described as an example. FIG. 10 is a block diagram of a conventional mini-disc system. First, the recording process will be described. The input data is analog digital (A /
D) The analog data is converted into digital data by the converter 615, and ATRAC (Adaptive TRansform Ac)
oustic Coding) input to the encoder / decoder 614. The ATRAC encoder / decoder 614 performs a code compression process by extracting only components that are essential for hearing using the minimum audibility characteristic and the masking effect that are human auditory characteristics, and the compressed data is subjected to shock proofing. Input to the memory controller 613. In the shock proof memory controller 613,
Buffer control is performed via the memory 612 so that data is transmitted without interruption even when there is mechanical vibration of the device, and EFM (Eight to Fourteen Modulatio
n) ・ ACIRC (Advanced Cross Interleave Reed Solo
mon Code) Input to the encoder / decoder 610.
In the EFM ACIRC encoder / decoder 610,
Based on an error correction method called ACIRC, an error correction code is added, data interleaving and EFM modulation are performed, and input to the head control circuit 606. Thereafter, a head drive signal is generated by the head control circuit 606 based on the modulated data, and is applied to the recording head 602, whereby the data is recorded on the disk 601.

Next, the reproduction process will be described. The recording data read from the disk 601 by the optical pickup 604 is input to the RF amplifier 608 and amplified, and then input as an RF signal to the address decoder 607, the servo control circuit 609, and the EFM / ACIRC encoder / decoder 610. The address decoder 607 demodulates the physical address on the disk 601 based on the RF signal, extracts the CLV servo signal,
Input to the EFM / ACIRC encoder / decoder 610. After that, PLL control, EFM demodulation processing, and error correction processing are performed by the EFM / ACIRC encoder / decoder 610, and the result is input to the shockproof memory controller 613. In the shock-proof memory controller 613, buffer control is performed via the memory 612, and the ATRAC encoder / decoder 61
4 is input. Thereafter, the ATRAC encoder / decoder 614 decodes the compressed data,
After being converted from digital data to analog data by the D / A converter 616, reproduced data is output as output data.

The MPU 611 has a servo control circuit 6
09, EFM ACIRC encoder / decoder 610
And has a role of sending a control signal to the shockproof memory controller 613. Servo control circuit 6
09 is the RF signal from the RF amplifier 608 and the MPU
Based on the control signal from 611, the spindle motor 60
3. A circuit for performing spindle servo control, tracking servo control, and focusing servo control for the feed motor 605 and the optical pickup 604, respectively.

FIG. 11 is a diagram showing the configuration of recorded data on a conventional mini-disc. As shown in FIG. 11, a PTO which is a read-only management area is
The C (Premastered Table Of Contents) area is further outside the UTOC (User's Table
Of Contents) area. In the UTOC area, management information such as address information is managed. At the time of recording, management information necessary for reproducing data to be reproduced such as audio data is written in the UTOC area in advance, and at the time of reproduction, the management information of the UTOC area is first read, and then the audio data is written based on the management information. To play. Editing (deletion, music exchange, etc.) of recording data is also possible by rewriting this UTOC area.

However, if for some reason, UTO
If the management information cannot be written in the C area, a problem occurs that the data to be reproduced cannot be reproduced even though the data to be reproduced such as audio data is recorded on the disc.

[0007]

As described above, in the above-mentioned conventional data recording / reproducing apparatus for reproducing data, management information such as address information is stored in a user management area at the time of recording as information necessary for reproducing data to be reproduced. Is written in advance, and at the time of reproduction, first, the management information recorded in the user management area is read, and then the data to be reproduced is reproduced based on the management information. Therefore, if the management information cannot be written in the user management area for some reason, the recorded data cannot be reproduced even though the data to be reproduced is recorded on the disc. there were.

The present invention is intended to solve such a problem. Even when the management information cannot be written in the user management area, it is determined that the management information could not be written in the user management area, and thus the reproduced information can be reproduced. It is an object of the present invention to provide a reproduced data recording / reproducing apparatus and a medium capable of normally reproducing data.

[0009]

In order to achieve the above object, the present invention has a user management area as a user use area for writing management information indicating the use state when the user uses the area. A special storage area for writing additional information indicating whether the management information has been normally written in the user management area is further provided to obtain a packaged recording medium.

In order to achieve the above object, the present invention provides a recording means for recording data to be reproduced on a recording medium, and reproduces the data to be reproduced when recording the data to be reproduced on the recording medium. Writing means for writing management information such as address information to the user management area as necessary information for reading, reading means for reading the management information from the user management area to reproduce the data to be reproduced from the recording medium, A reproducing unit for reproducing the data to be reproduced based on the management information read from the management area; and a management information error flag indicating that the management information could not be written when the management information could not be written to the user management area. And storage means for storing

In order to achieve the above object, the present invention reads a management information error flag at the time of reproduction, and if the management information error flag is set, the management information is not written in the user management area. And reproducing means for accessing and reproducing the head of the data to be reproduced upon judging that the data has been reproduced.

In the present invention, the storage means is provided as a storage means for storing a management information error flag indicating that the management information could not be written in a predetermined area of a disk lead-in area.

In the present invention, the storage means is provided as a storage means for storing a management information error flag indicating that the management information could not be written in a nonvolatile memory incorporated in the apparatus.

Further, in the present invention, the storage means is provided as a storage means for storing a management information error flag indicating that the management information could not be written in a non-volatile memory incorporated in the disk cartridge. .

In the present invention, the storage means is provided as a storage means for mechanically storing a management information error flag indicating that the management information could not be written in the disk cartridge.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram of recording / reproducing data to be reproduced according to the embodiment of the present invention. The internal structure of the information recording / reproducing unit (physical block) in the information recording / reproducing apparatus will be described with reference to FIG.

A. Functional description of information recording / reproducing unit A1. Basic function of information recording / reproducing unit The information recording / reproducing unit mainly performs the following processing. Recording or rewriting of new information (including erasing of information) is performed using a focused spot at a predetermined position on the information storage medium (optical disk) 101. Further, processing such as reproduction of already recorded information from a predetermined position on the information storage medium (optical disk) 101 using a focused spot. A2. Means for Achieving Basic Function of Information Recording / Reproducing Unit As means for achieving the above basic function, the information recording / reproducing unit uses a track (not shown) on the information storage medium 101.
The light spot is traced (followed) along. Further, the recording / reproducing / erasing of information is switched by changing the amount of light of the converging spot irradiated on the information storage medium 101. Further, there is provided means for converting an externally applied recording signal d into an optimal signal for recording at a high density and a low error rate. B. Structure of mechanism part and operation of detection part B1. Basic Structure of Optical Head 102 and Signal Detection Circuit Although not shown, the optical head 102 basically includes a semiconductor laser element as a light source, a photodetector, and an objective lens. The laser light emitted from the semiconductor laser element is transmitted to an information storage medium (optical disk) 1 by an objective lens.
The light is converged on 01. Information storage medium (optical disk) 10
The laser light reflected by the light reflecting film or the light reflective recording film is photoelectrically converted by a photodetector.

The detection current obtained by the photodetector is
3 is subjected to current-voltage conversion to become a detection signal. This detection signal is processed by the focus / track error detection circuit 117 or the binarization circuit 112. 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 1
At 17, the calculation of the sum / difference is performed to detect the focus shift and the track shift. Information storage medium (optical disk) 10
A signal on the information storage medium 101 is reproduced by detecting a change in the amount of reflected light from the light reflecting film or the light reflective recording film.

A method of detecting a focus shift will be described. An astigmatism method is known as a method for optically detecting the amount of defocus. In the astigmatism method, an optical element (not shown) that generates astigmatism is arranged on a detection optical path of laser light reflected by a light reflection film or a light reflection recording film of an information storage medium (optical disk) 101, This is a method of detecting a change in the shape of the laser light irradiated on the photodetector. The light detection area is divided into four diagonally. The focus error detection signal is obtained by taking the difference between the diagonal sums in the focus / track error detection circuit 117 for the detection signal obtained from each detection area.

Alternatively, there is a knife edge method as a method for optically detecting a focus shift amount. The knife edge method is a method of disposing a knife edge that asymmetrically shields a part of the laser light reflected by the information storage medium 101. 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.

Either of the above is often used to detect the amount of focus shift. A method for detecting a track shift will be described. The information storage medium (optical disk) 101 has a spiral or concentric track, and information is recorded on the track. Information 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 a track deviation, generally a DP is used.
There is a D (Differential Phase Detection) method. This DP
Method D is a method of detecting a change in intensity distribution of a laser beam reflected by a light reflecting film or a light reflecting recording film of an information storage medium (optical disk) 101 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 is calculated in a focus / track error detection circuit 117 to obtain a track error detection signal.

Alternatively, there is a Push-Pull (push-pull) method. The push-pull method uses the information storage medium 101
Detecting a change in intensity distribution of the laser light reflected by the light detector on the 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.

There is a Twin-Spot method. In this method, a diffraction element or the like is arranged in a light transmission system between the semiconductor laser element and the information storage medium 101 to split light into a plurality of wavefronts,
This is a method for detecting a change in the reflected light amount of the ± 1st-order diffracted light applied to the information storage medium 101. 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, and a difference between the respective detection signals is detected to detect a track error. Get the signal.

The structure of the objective lens actuator will be described. An objective lens (not shown) that focuses the laser light emitted from the semiconductor laser element on the information storage medium 101 has a structure that can move in two axial directions according to the output current of the objective lens actuator drive circuit 118. ing. The moving direction of the objective lens is perpendicular to the information storage medium 101 for correcting a focus shift, and the moving direction of the objective lens is
1 in the radial direction.

Although not shown, the mechanism for moving the objective lens is called an objective lens actuator. As an objective lens actuator structure, there is a shaft sliding method. In this method, a blade integrated with an objective lens moves along a central axis (shaft). The blade moves in a direction along the central axis to perform focus shift correction, and the blade moves with respect to the central axis. This is a method of performing track deviation correction by rotational movement.

Alternatively, there is a four-wire system. In this method, a blade integrated with an objective lens is connected to a fixed system by four wires, and the blade is moved in two axial directions by using elastic deformation of the wires.

Although the above-mentioned methods are often used, each method has a structure in which a permanent magnet and a coil are provided, and the blade is moved by applying a current to a coil connected to the blade.

The rotation control system of the information storage medium 101 will be described. An information storage medium (optical disk) 101 is mounted on a rotary table 121 which is rotated by a driving force of a spindle motor 104. The number of rotations of the information storage medium 101 is detected by a reproduction signal obtained from the information storage medium 101. That is, the detection signal (analog signal) output from the amplifier 113 is converted into a digital signal by the binarization circuit 112, and a PLL circuit 111 generates a fixed period signal (reference clock signal) from the signal. The information storage medium rotation speed detection circuit 114 detects the number of rotations of the information storage medium 101 using this signal and outputs the value.

A correspondence table of the number of rotations of the information storage medium corresponding to the radial position to be reproduced or recorded / erased on the information storage medium 101 is recorded in the semiconductor memory 119 in advance. When the reproduction position or the recording / erasing position is determined, the control unit 120 sets the target rotation speed of the information storage medium 101 with reference to the information in the semiconductor memory 119, and notifies the spindle motor drive circuit 115 of the value.

In the spindle motor drive circuit 115,
The target rotation speed and the information storage medium rotation speed detection circuit 114
, And a drive current corresponding to the result is supplied to the spindle motor 104 so that the rotation speed of the spindle motor 104 is controlled to be constant. The output signal of the information storage medium rotation speed detection circuit 114 is a pulse signal having a frequency corresponding to the rotation speed of the information storage medium 101,
At 5, control is performed on both the frequency and pulse phase of this signal.

The optical head moving mechanism will be described. Optical head moving mechanism (feed motor) 103 for moving optical head 102 in the radial direction of information storage medium 101
have. In many cases, a rod-shaped guide shaft is used as a guide mechanism for moving the optical head 102,
The optical head 102 uses friction between the guide shaft and a bush attached to a part of the optical head 102.
Moves. 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 102 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 mounted on the optical head 102. And converts the rotational motion of the rotary motor into a linear motion of the optical head 102. As another driving force transmission method, there is a case in which a permanent magnet is disposed in a fixed system, and a current is supplied to a coil disposed in the optical head 102 to move the linear motor in a linear direction.

In both the rotary motor and the linear motor, basically, a current is supplied to the feed motor to generate a driving force for moving the optical head 102. This drive current is supplied from the feed motor drive circuit 116.

C. Function of each control circuit C1. Focusing Spot Trace Control In order to perform focus shift correction or track shift correction, a drive current is supplied to an objective lens actuator (not shown) in the optical head 102 according to an output signal (detection signal) of the focus / track error detection circuit 117. Is the objective lens actuator drive circuit 1
Eighteen. 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 to a high frequency range.

Objective lens actuator drive circuit 11
In step 8, on / off processing of a focus / track deviation correction operation (focus / track loop) is performed according to a command from the control unit 120. Further, a process of moving the objective lens at low speed in the vertical direction (focus direction) of the information storage medium 101 (executed when the focus / track loop is off) is performed.

Further, a process of slightly moving the information storage medium 101 in a radial direction (a direction crossing a track) by using a kick pulse to move the focused spot to an adjacent track can be executed.

C2. Laser Light Amount Control Processing for switching between reproduction and recording / erasing will be described. Switching between reproduction and recording / erasing is performed by changing the amount of light of a converging spot irradiated on the information storage medium 101. For an information storage medium using the phase change method, a relationship of “light amount at the time of recording”> “light amount at the time of erasing”> “light amount at the time of reproduction” is generally established, and the information storage medium using the magneto-optical method is generally used. In general, “light quantity at the time of recording” = approximately “light quantity at the time of erasing”>
There is a relationship of “light quantity at the time of reproduction”. 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 information storage medium 101 during recording / erasing. At the time of reproducing information, a constant light amount is continuously irradiated on the information storage medium 101. When recording new information, the 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 information storage medium 101 locally causes an optical change or a shape change,
A recording mark is formed. Similarly, when overwriting an already recorded area, the semiconductor laser element emits a pulse.

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

The laser emission control will be described. Although not shown, the optical head 102 has a built-in photodetector for detecting the light emission amount of the semiconductor laser element. The semiconductor laser drive circuit 105 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 / reproduction / erase control waveform generation circuit 106, and based on the result, calculates the semiconductor laser The drive current to the is fed back.

D. Various operations related to the control system of the mechanism part D1. Start Control The information storage medium (optical disk) 101 is
1 and start control, processing is performed according to the following procedure.

1) The target rotation speed is transmitted from the control unit 120 to the spindle motor drive circuit 115, and a drive current is supplied from the spindle motor drive circuit 115 to the spindle motor 104, so that the spindle motor 104 starts rotating.

2) At the same time, a command (execution command) is issued from the control unit 120 to the feed motor drive circuit 116, and a drive current is supplied from the feed motor drive circuit 116 to the optical head drive mechanism (feed motor) 103 so that the optical The head 102 moves to the innermost position of the information storage medium 101. It is confirmed that the optical head 102 is located further inward than the area of the information storage medium 101 where the information is recorded.

3) When the spindle motor 104 reaches the target rotation speed, its status (status report) is sent to the control unit 120. 4) A current is supplied from the semiconductor laser driving circuit 105 to the semiconductor laser element in the optical head 102 according to the reproduced light amount signal sent from the control unit 120 to the recording / reproducing / erasing control waveform generation circuit 106, and laser emission is started. I do.

* Since the optimum irradiation light amount at the time of reproduction differs depending on the type of the information storage medium (optical disk) 101, the value of the irradiation light amount is set to the lowest value at the time of startup. 5) The optical head 1 according to a command from the control unit 120
02 to the information storage medium 1 (not shown).
The objective lens actuator drive circuit 118 controls the objective lens actuator drive circuit 118 so that the objective lens is slowly moved closer to the information storage medium 101 by shifting the objective lens to the position furthest away from the information storage medium 101.

6) At the same time, the focus / track error detection circuit 117 monitors the amount of focus shift, and outputs a status when the objective lens comes near a focused position to notify the control unit 120 of the status.

7) Upon receiving the notification, the control unit 120 issues a command to the objective lens actuator drive circuit 118 to turn on the focus loop. 8) The control unit 120 issues a command to the feed motor drive circuit 116 while keeping the focus loop on to move the optical head 102 slowly toward the outer peripheral portion of the information storage medium 101.

9) At the same time, the reproduction signal from the optical head 102 is monitored, and the optical head 102
When the optical head 102 reaches the recording area on the first position, the movement of the optical head 102 is stopped, and a command to turn on the track loop is issued to the objective lens actuator driving circuit 118.

10) Information storage medium (optical disk) 101
The "optimum light quantity at the time of reproduction" and the "optimum light quantity at the time of recording / erasing" recorded on the inner peripheral portion of the disc are reproduced.
The data is recorded in the semiconductor memory 119 via the memory 20.

11) Further, the control unit 120 sends a signal corresponding to the “optimum light amount at the time of reproduction” to the recording / reproduction / erase control waveform generation circuit 106 to reset the light emission amount of the semiconductor laser element at the time of reproduction.

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 information storage medium 101. D2. Access Control Reproduction of access destination information on the information storage medium 101 will be described.

The information on what kind of information is recorded in which location on the information storage medium 101 differs depending on the type of the information storage medium 101, and generally, directory management in the information storage medium 101. Area, or
Recorded in the navigation pack.

Directory management area: information storage medium 1
01 is an area that is collectively recorded in the inner peripheral area or the outer peripheral area. Navigation Pack: MPEG2 PS
VOBS based on (Program Stream) data structure
Control data included in (Video Object Set)
Information on where the next video is recorded is recorded.

When it is desired to reproduce or record / delete specific information, the information in the above-mentioned area is reproduced first, and the access destination is determined from the obtained information. First, coarse access control will be described.

The control unit 120 calculates the radius position of the access destination by calculation and calculates the distance from the current position of the optical head 102. The speed curve information that can be reached in the shortest time with respect to the moving distance of the optical head 102 is stored in advance in the semiconductor memory 1
19. The control unit 120 reads the information and controls the movement of the optical head 102 in the following manner according to the speed curve.

After issuing a command from the control unit 120 to the objective lens actuator drive circuit 118 to turn off the track loop, the feed motor drive circuit 116 is controlled to start the movement of the optical head 102.

When the focused spot crosses a track on the information storage medium 101, a track error detection signal is generated in the focus / track error detection circuit 117. Using this track error detection signal, the relative speed of the focused spot with respect to the information storage medium 101 can be detected.

The feed motor drive circuit 116 calculates the difference between the relative speed of the condensed spot obtained from the focus / track error detection circuit 117 and the target speed information sent one by one from the control unit 120, and compares the result with the optical head. The optical head 102 is moved while applying feedback to a drive current to a drive mechanism (feed motor) 103.

As described in the above item "optical head moving mechanism", frictional force always acts between the guide shaft and the bush or bearing. When the optical head 102 is moving at high speed, kinetic friction acts. However, at the start of movement and immediately before the stop, the moving speed of the optical head 102 is low, and static friction acts. 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 driving mechanism (feed motor) 103 in response to a command from the control unit 120 is increased. Like that.

Next, the fine access control will be described.
When the optical head 102 reaches the target position, the control unit 120
Sends a command to the objective lens actuator drive circuit 118 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 information storage medium 101. The current focused spot position is calculated from the address or track number there, and the number of error tracks from the target position is determined by the control unit 120.
And notifies the objective lens actuator drive circuit 118 of the number of tracks required for moving the focused spot.

Objective lens actuator drive circuit 11
When one set of kick pulses is emitted within 8, the objective lens slightly moves in the radial direction of the information storage medium 101, and the focused spot moves to the next track.

Objective lens actuator drive circuit 11
8, the track loop is temporarily turned off, and the control unit 1
After the number of kick pulses generated according to the information from 20 is generated, the track loop is turned on again.

After completion of the fine access, the control unit 120 reproduces information (address or track number) of the position traced by the focused spot and confirms that the target track is being accessed.

D3. Continuous Recording / Reproduction / Erase Control As shown in FIG. 1, the track error detection signal output from the focus / track error detection circuit 117 is input to the feed motor drive circuit 116. The control unit 120 controls the feed motor drive circuit 116 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 accessing, a part of the track error detection signal is transmitted to the optical head driving mechanism (feed motor) by the command from the control unit 120 via the motor driving circuit 116. ) 103 as a drive current. This control is continued during the period in which the reproduction or the recording / erasing process is continuously performed.

The center position of the information storage medium 101 is mounted with an eccentricity slightly shifted from the center position of the turntable 121. When a part of the track error detection signal is supplied as a drive current, the optical head 102
The whole moves slightly.

When the reproduction or the recording / erasing process is continuously performed for a long time, the focused spot position 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) 103, the optical head 102 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. D4. 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 section 120 issues a command to the objective lens actuator drive circuit 118 to turn off the track loop. 2) The control unit 120 issues a command to the objective lens actuator drive circuit 118 to turn off the focus loop.

3) The control unit 120 issues a command to the recording / reproducing / erasing control waveform generating circuit 106 to stop the light emission of the semiconductor laser element. 4) Notify the spindle motor drive circuit 115 of 0 as the reference rotation speed.

E. Flow of recording signal / reproduction signal to information storage medium E1. Format of Signal Recorded on Information Storage Medium 101 For a signal recorded on the information storage medium 101, it is possible to correct a recorded information error caused by a defect on the information storage medium 101. Further, the DC component of the reproduction signal is set to 0 to simplify the reproduction processing circuit. Further, the information storage medium 10
Information is recorded at the highest possible density for one. As shown in FIG. 1, the information recording / reproducing unit (physical block) performs "addition of an error correction function" and "signal conversion (modulation / demodulation of a signal) on recorded information" in order to satisfy such requirements.

E2. Signal flow during recording ECC (Error Correction Code) addition processing is performed.
That is, information to be recorded in the information storage medium 101 is input to the data input / output interface unit 122 as a recording signal d in the form of a raw signal. The recording signal d is recorded in the semiconductor memory 19 as it is, and then the ECC encoding circuit 108 performs the following process of adding an ECC.

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 11
In 9, one line is sequentially arranged for every 172 bytes, and one set of ECC blocks is formed in 192 lines. This “row: 172 × column:
For a raw signal (recording signal d) in a set of ECC blocks composed of 192 bytes ", an inner code PI of 10 bytes is calculated for each row of 172 bytes to obtain a semiconductor memory 119.
Additional record within. In addition, 16By for each column of Bytes unit
The outer code PO of tes is calculated and additionally recorded in the semiconductor memory 119.

As an embodiment of recording on the information storage medium 101, a total of 2366 bytes (2366 = (12 + 1) × (172 + 10)) of 12 lines including the inner code PI and one line for the outer code PO is used as a unit. Record within one sector.

When the addition of the inner code PI and the outer code PO is completed, the ECC encoding circuit 108 reads a signal of 2366 Bytes for one section from the semiconductor memory 119 and transfers it to the modulation circuit 107.

The signal modulation is performed as follows. In order to make the DC component (DSV: Digital Sum Value) of the reproduced signal close to 0 and record information at a high density in the information storage medium 101, the modulation circuit 10 converts the signal format as a signal format conversion.
Perform within 7.

A conversion table indicating the relationship between the original signal and the modulated signal is provided in the modulation circuit 107 and the demodulation circuit 110. The signal transferred from the ECC encoding circuit 108 is divided into a plurality of bits according to the modulation scheme, and converted into another signal (code) while referring to a conversion table.

For example, as a modulation method, 8/16 modulation (RL
When L (2, 10) code is used, there are two types of conversion tables, and a DC component (DSV: Disita
l Reference value conversion table is switched one by one so that (l Sum Value) approaches zero.

The generation of a recording waveform will be described. When recording marks are recorded on the information storage medium (optical disc) 101, generally, a recording method is a mark length recording method: a recording method in which "1" comes to the front end position and the rear terminal position of the recording mark. Recording method between marks: The center position of the recording mark is "1"
Method that matches the position of. 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 information storage medium 101. 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.

Next, in the recording / reproducing / erasing control waveform generating circuit 106, the above-described recording waveform is created in accordance with the recording signal sent from the modulation circuit 107 and transmitted to the semiconductor laser driving circuit 105. ing.

E3. Signal Flow During Reproducing Explanation of Binarization / PLL Circuit As described in "Signal Detection by Optical Head 102", reflection from the light reflecting film or light reflecting recording film of the information storage medium (optical disk) 101 A signal on the information storage medium 101 is reproduced by detecting a change in the amount of light. The signal obtained by the amplifier 113 has an analog waveform. Binarization circuit 1
At 12, the signal is converted into a binary digital signal consisting of "1" and "0" using a comparator.

A reference signal at the time of reproducing information is extracted by the PLL circuit 111 from the obtained reproduction signal. PL
The L circuit 111 has a built-in variable frequency oscillator. The frequency and phase between the pulse signal (reference clock) output from the oscillator and the output signal of the binarization circuit 112 are compared, and the result is fed back to the oscillator output.

The demodulation of a signal will be described. The demodulation circuit 110 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 111. The returned (demodulated) signal is recorded in the semiconductor memory 119.

The error correction processing will be described. The error correction circuit 109 detects an error portion of the signal stored in the semiconductor memory 119 using the inner code PI and the outer code PO, and sets a pointer flag of the error portion. Thereafter, while reading the signal from the semiconductor memory 119, 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 122.

The signal sent from the ECC encoding circuit 108 is transmitted to the data input / output
2 as a reproduction signal c. Although FIG. 1 shows that the control unit 120 is connected only to the spindle motor drive circuit 115, the control unit 120 is actually connected so that data can be exchanged with the blocks of each unit.

Next, an example of the main part of the present invention will be described. That is, in this device, when the user management information is not successfully written in the user management area of the information recording medium 101, the control unit 120 determines this and the flag is generated in the flag generation circuit 301. This flag is modulated by, for example, the modulator 302 and written into the memory 304 provided in the cartridge 303 of the information recording medium 101.

As the write destination, there are various embodiments, which will be described later. FIG. 2 is a flowchart illustrating the operation of control unit 120. Regarding the recording operation, first, the data to be reproduced is recorded in the data to be reproduced area (step a1). At this time, management information necessary for reproducing the data to be reproduced is written in the user management area (step a2). Here, it is determined whether the management information has been successfully written (step a3). If the management information has been successfully written, the management information error impossible flag is not set (step a4), but if the management information could not be written for some reason, the management information error flag is set (step a5).

Here, in step a3, to determine whether the user management information has been successfully written in the user management area, a flowchart as shown in FIG. 3 is executed.

In FIG. 3, the management information is read from the memory and the management information is written on the recording medium (step b1,
b2). Next, the management information written on the medium is reproduced and viewed (step b3). Then, the reproduced management information is compared with the management information before recording remaining in the memory (step b4). Here, if they match, it means that writing has been performed normally, and if they do not match, it means that writing has not been successfully performed for some reason.

In the case of a mismatch, as explained in FIG.
The management information error flag is stored in a special area provided in, for example, a lead-in area of a disk font, or in a nonvolatile memory provided in a disk cartridge, or in a memory of a control unit, or in a nonvolatile memory provided specially in the apparatus. Is written. Alternatively, the originally written information is deleted or changed.

FIG. 4 is a flowchart showing the operation at the time of reproduction. At the time of reproduction, after the reproduced data reproduction instruction, it is first determined whether or not the disc is a virgin disc (steps c1 and c2). If it is a virgin disc, it is determined that no data has been recorded, and the process ends. If the disk is not a virgin disk, the management information error flag is read (step c3). If the management information error flag is not set, it is determined that the management information was successfully written at the time of recording,
Read the management information written in the user management area,
The data to be reproduced is reproduced based on the management information (steps c4 and c5). However, if the management information error flag is set, it is determined that the user management information could not be written for some reason during recording, and control is performed so that the data to be reproduced is reproduced from the beginning (step c6).

That is, if the management information cannot be written for some reason at the time of recording, a management information error flag is set. At the time of reproduction, it can be determined that the management information could not be written by the flag, and if the flag is set. Then, the data is reproduced from the beginning of the data to be reproduced. By doing so, it is possible to solve the problem that the data to be reproduced cannot be reproduced despite the fact that the data to be reproduced has been recorded on the disk due to the inability to write the management information as in the related art.

Various cases when writing the management information error flag will be described. FIG. 5A shows an embodiment in which the management information error flag is written on the disk itself. In the user management area, a management information error flag area is provided separately from the area where the management information is written.

At the time of recording, if the management information can be written without any problem, the management information error flag is not set, but if the management information cannot be written for any reason, the management information error flag is set in the management information error flag area. . Then, at the time of reproduction, the management information error flag area is read, and if the management information error flag is not set, it is determined that the management information has been successfully written at the time of recording,
Read the management information written in the user management area,
The data to be reproduced is reproduced based on the management information. However, if the flag is set, it is determined that the management information could not be written for some reason during recording, and the data is reproduced from the beginning of the data to be reproduced.

The specific processing is realized by the data processing function of the control unit 120. That is, the control unit 120 has a user management information construction function as shown in FIG.
When data is rewritten or written by a user operation, a management information construction function for managing a write address, data size, and the like is provided. When the writing of the data to be reproduced is completed, a recording process of the constructed management information is executed. The management information to be recorded is performed through a recording system of the device. When the recording process is completed, the control unit 12
0 switches the device to the playback state. Then, reading of the user management information is realized. Reading is performed using the reproduction system of the apparatus. The read information is transmitted to the control unit 12
By the comparison processing function of 0, the information is compared with the management information before recording. That is, the processing described in FIGS. 2 and 3 is executed.

As a result, if the management information has been successfully written, the process ends. If the management information has not been written properly, a management information error flag is generated, and an error flag is written to the management information error flag area through the recording system. Write. At the time of reproduction, the management information error flag information is read and the reproduction as described in FIG. 4 is executed.

FIG. 6 shows an embodiment in which a nonvolatile memory 402 is provided in a cartridge 401 of a disk, and a management information error flag is written in the memory 402.
At the time of recording, if the management information can be written without any problem, the management information error flag is not set, but if the management information cannot be written for any reason, the nonvolatile memory 4
02, a management information error flag is set. Then, at the time of reproduction, the nonvolatile memory 402 is read, and if the management information error flag is not set, it is determined that the management information has been successfully written at the time of recording, and the management information written in the user management area is read. The data to be reproduced is reproduced based on the management information. However, if the flag is set, it is determined that the management information could not be written for some reason during recording, and the data is reproduced from the beginning of the data to be reproduced.

FIG. 10B shows a signal path for writing a management information error flag in the nonvolatile memory 402 and a signal path for reading the management information error flag from the nonvolatile memory 402. The write signal path is a path of the error flag generation circuit 301, the modulator 302, and the contact 403. The read signal path is a path of the contact 403, the demodulator 404, and the control unit 120.

FIG. 7A shows still another embodiment of the present invention. In this embodiment, a dedicated in-device nonvolatile memory 10 for a management information error flag is provided in the device 1000.
01 is provided.

As shown in FIG. 7B, the control unit 120 can determine whether or not the user management information has been normally written as in the previous embodiment. If not, a management information error flag is generated, and the data can be written to the non-volatile memory 1001 in the device.

Here, the control unit 120 also recognizes the identification number of the relevant disk, and
It is configured to write a management information error flag to the address corresponding to 01 (FIG. 7C).

That is, in order to perform recognition by providing the memory 1001 in the apparatus, if a different disc is reproduced, erroneous recognition occurs. Therefore, the number corresponding to the disc (for example, a manufacturing number) is recorded in the nonvolatile memory 1001 at the time of recording. To memorize. By doing so, at the time of reproduction, the number corresponding to the disc and the management information error flag are read from the non-volatile memory 1001 in the apparatus, and it can be determined whether the management information has been written to the disc. In this case, it is effective to place the apparatus in an apparatus equipped with an autochanger function for handling a plurality of disks.

FIG. 8 shows still another embodiment of the present invention. A management information error flag marking switch 502 that operates mechanically is provided in a disk cartridge 501 for storing a disk. At the time of recording, if the management information can be written without any problem, the management information error flag is not set (the management information error flag marking switch 502 is off), but if the management information cannot be written for any reason, the management information error flag is set. The management information error flag marking switch 5
Turn on 02. At the time of reproduction, the management information error flag marking switch 502 is determined. If the management information error flag is not set, it is determined that the management information can be written without any problem at the time of recording, and the management information written in the user management area is read. The data to be reproduced is reproduced based on the management information. However, if the flag is set, it is determined that the management information could not be written for some reason during recording, and the data is reproduced from the beginning of the data to be reproduced.

FIGS. 9A to 9C show examples of the structure of a mechanical switch. For example, a hole 511 is provided in a part of the jacket 501. And this hole 511
A rotatable body 512 that can be opened or closed depending on the rotation position is rotatably mounted. On the other hand, at a predetermined insertion position of the jacket 501, a driving rotating body 521 is provided at a position close to the rotating body 512. Then, the drive rotator 521 is moved from the state shown in FIG. 9A to the state shown in FIG.
When rotated like this, the rotated body 512 is driven,
It is designed to close the hole 511.

When the control unit 120 outputs the management information error flag and the driving rotator 521 is rotated by one rotation, if an error flag occurs, the hole 51
1 will be closed. This hole 511 in the playback device
Whether the disk is in an open state or a closed state is detected by, for example, a switch having a light-emitting element and a light-receiving element, so that a disk in which management information has not been normally written can be determined.

[0108]

As described above, according to the present invention, even when management information necessary for reproducing the data to be reproduced cannot be written in the user management area when recording the data to be reproduced, the management can be performed. By providing a means for determining that information could not be written in the user management area, it is possible to provide a reproduced data recording / reproducing apparatus and a recording medium that can normally reproduce the reproduced data.

[Brief description of the drawings]

FIG. 1 is a block diagram of a reproduced data recording / reproducing apparatus according to the present invention.

FIG. 2 is a flowchart for explaining the operation of the apparatus of the present invention.

FIG. 3 is a flowchart for explaining the operation of the apparatus of the present invention.

FIG. 4 is a flowchart for explaining the operation of the apparatus of the present invention.

FIG. 5 is a diagram for explaining the first embodiment of the present invention.

FIG. 6 is a diagram for explaining a second embodiment of the present invention.

FIG. 7 is a diagram for explaining a third embodiment of the present invention.

FIG. 8 is a diagram for explaining a fourth embodiment of the present invention.

FIG. 9 is a diagram illustrating a part of the embodiment in FIG. 8;

FIG. 10 is a block diagram of a conventional mini disk system.

FIG. 11 is a configuration diagram of recording data of a conventional mini-disc.

[Explanation of symbols]

101: information storage medium (optical disk), 102: optical head, 103: optical head moving mechanism (feed motor),
104: spindle motor; 105: semiconductor laser drive circuit; 106: recording / reproduction / erase control waveform generation circuit; 107: modulation circuit; 108: ECC encoding circuit; 109: error correction circuit;
111: PLL circuit, 112: Binarization circuit, 113: Amplifier, 114: Information storage medium rotation speed detection circuit, 115
... Spindle motor drive circuit, 116 ... Motor drive circuit, 117 ... Focus / track error detection circuit,
118 ... Object lens actuator drive circuit, 119
... Semiconductor memory, 120 ... Control unit, 121 ... Rotating table, 122 ... Data input / output interface unit, 4
01: disk cartridge, 402: nonvolatile memory, 501: disk cartridge, 502: UTOC
Writable flag marking SW, 601: disk, 602: recording head, 603: spindle motor,
604: Optical pickup, 605: Feed motor, 606
... head control circuit, 607 ... address decoder, 608
... RF amplifier, 609 ... servo control circuit, 610 ... EF
M · ACIR encoder / decoder, 611 ... MPU,
612: memory, 613: shock-proof memory controller, 614: ATRAC encoder / decoder,
615 ... A / D converter, 616 ... D / A converter.

Claims (9)

[Claims] 1. A user use area, which has a user management area for writing management information indicating a state of use when a user uses the memory, and whether the management information has been normally written in the user management area. A recording medium, further comprising a special area for writing additional information indicating whether the information is packaged. 2. The recording medium according to claim 1, wherein when the management information is not written normally, a flag is written in the special area. 3. The non-recorded data is written in the special area in advance, and if the management information is not normally written, the unrecorded data is deleted or changed. 2. The recording medium according to claim 1, wherein the recording medium is used. 4. Recording means for recording data to be reproduced on a recording medium, and management of address information and the like as information necessary for reproducing the data to be reproduced when recording the data to be reproduced on the recording medium. Writing means for writing information to a user management area; reading means for reading the management information from the user management area to reproduce the data to be played back from the recording medium; and reading the management information from the user management area based on the management information. Reproduction means for reproducing the data to be reproduced, and storage means for storing a management information error flag indicating that the management information could not be written when the management information could not be written in the user management area. Data to be played back, characterized by
Playback device. 5. The reproduction means reads a management information error flag during reproduction, and if the management information error flag is set, judges that the management information has not been written in the user management area. 3. The apparatus for recording / reproducing data to be reproduced according to claim 2, wherein the reproducing means accesses and reproduces the head of the data to be reproduced. 6. The storage unit according to claim 4, wherein the storage unit stores the management information error flag indicating that the management information could not be written in a predetermined area of a disk lead-in area. A recording / reproducing apparatus for data to be reproduced according to the above. 7. The storage unit according to claim 1, wherein the storage unit stores the management information error flag indicating that the management information could not be written in a nonvolatile memory incorporated in the apparatus. 5. A device for recording / reproducing data to be reproduced according to 4. 8. The storage unit according to claim 1, wherein the storage unit stores the management information error flag indicating that the management information could not be written in a non-volatile memory incorporated in a disk cartridge. Claim 4
A recording / reproducing apparatus for data to be reproduced according to the above. 9. The storage device according to claim 4, wherein said storage means is a storage means for mechanically storing the management information error flag indicating that the management information could not be written in a disk cartridge. Playback data recording and playback device.