JPH05210849A - Rewritable type optical disk and method for recording and reproducing the same - Google Patents

Abstract

PURPOSE:To reproduce disk a CD player and a CD-WO disk device by forming the surface of an optical disk with material generating phase change according to temperature and whose optical reflectance differs at a different phase and ticking an absolute time with the modulation of a pregroove signal. CONSTITUTION:The surface of the disk is formed by the material generating the phase change according to temperature and whose optical reflectance differs at a different phase. Then a laser power correction area, a program memory area, a read-in area ticking an absolute time as the pregroove signal, a program area and a read-out area are provided on the same position as the CD-WO disk. When TOC is not written on the read-in area, the recording content of the program memory area is read by the CD-WO disk device, and the program area is regenerated based on the data. When the TOC of an equal format with the CD disk is written on the CD-WO disk, the CD-WO disk is reproduced by the present CD player.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc rewritable by a one-beam optical pickup and a recording / reproducing method thereof, and more particularly to a recording / reproducing method capable of reproducing by a current CD player or CD-WO disc device. Regarding

[0002]

2. Description of the Related Art Conventionally, C has been used as an optical disk recording / reproducing apparatus.
D-WO disk devices are known. The CD-WO disc device performs tracking servo and focus servo by pregrooves engraved on a CD-WO (write-once) disc, and pits the disc by modulating the laser power of the optical pickup with a recording EFM signal. Recording is performed in rows.

The recording area of a CD-WO disc is divided into a laser power calibration area (PCA), a program memory area, a lead-in area, a program area and a lead-out area, which are the absolute time when the wobble signal is FM-modulated. The position is defined by (ATIP).

The PCA is an area for calibrating the laser power of the optical pickup and is arranged in the innermost circumference. The program memory area is an area for recording the recorded movement number and the absolute time indicating the recording position, and is arranged outside the PCA. The program area is an area for recording arbitrary data, and a lead-in area and a lead-out area are arranged on the inner and outer circumference sides thereof, respectively.

The lead-in area is an area in which a TOC (Table of Contents) is written after the recording of the CD-WO disk is completed, and is adjacent to the outer peripheral side of the program memory area. In the lead-out area, data AA indicating that there is no effective recording on the outer peripheral side is recorded. FIG. 12 shows an arrangement of each area of the CD-WO disc and a recording example.

Similar to a CD, a CD-WO disc is reproduced by utilizing the fact that the reflectance of laser light differs depending on the presence or absence of pits on the signal surface. When TOC is not written,
The recorded contents of the program memory area are read by the CD-WO disk device, and the program area is reproduced based on the data.

When the TOC having the same format as that of the CD disc is written on the CD-WO disc, the TOC can be played back by the present CD player.

Although a CD-WO disc with a TOC written on it has the advantage that it can be played back by a current CD player, it is recorded by thermal deformation, so it is possible to erase or overwrite the record once written. There was a drawback that I could not.

A magneto-optical disk (M is used as a disk capable of erasing or overwriting a record once written.
O disk). Since a magneto-optical disk is expensive for a disk and a recording / reproducing apparatus, and the reproduction is performed by an effect of rotating a polarization plane of reflected light (Kerr effect), a CD player or a CD player that reproduces by a difference in light reflectance. CD-WO
The principle of reproduction is different from that of the disk device, and there is a drawback that these devices cannot reproduce.

Conventionally, as a disk which can be erased and overwritten by reproducing by the difference in light reflectance,
T _e, S _e, there is a phase-change disk G _e -T _e -S _b recording film using chalcogenide is a substance containing an element of S.

In a phase change disk, it is amorphous (recorded state)
Recording and erasing are performed by utilizing the reversible phase change between the two states of crystal and crystal (erased state), and information is reproduced by utilizing the difference in optical characteristics (reflectance).

[0012] FIG. 10 shows the crystalline state and the reflectance of the amorphous state of G _e -T _e -S _b recording film. Around 770 to 830 nm, which is the semiconductor laser wavelength of the CD player, a large reflectance contrast ratio is obtained as shown in the figure, and a reproduction signal is obtained based on the contrast ratio.

In general, an amorphous material is formed by suddenly extinguishing a molten state. On the other hand, crystals are formed by maintaining the temperature above the crystallization temperature for a certain time (solid phase crystallization).

Recording is performed, for example, by modulating the semiconductor laser power with a digital signal waveform varying between about 6 mW and 12 mW as shown in FIG. The figure shows an example of modulation with a digital signal 100010101.

The semiconductor laser power thus modulated gives a temperature change on the disk as shown in FIG. 11 (b). Usually, old information is already recorded on the disc, so that the portion through which the light spot passes may be amorphous or crystalline. Regardless of the state before irradiation, when the light of an amorphization level is irradiated, the portion is melted and suddenly changed to an amorphous state by the movement of the light spot.

On the other hand, when irradiated with light of a crystallization level,
After the temperature is raised to the crystallization temperature range below the melting point, it is cooled by the movement of the light spot to be in a crystalline state. Overwriting is performed in this way. FIG. 11C shows a state in which overwriting is performed.

Since the pre-guove for guiding the light spot of the above-mentioned phase change disk is merely spiral and no signal is recorded, a signal indicating the linear velocity of the light spot cannot be obtained, and the disk has a CAV (rotation). Recording and reproduction are performed by being rotated by a constant number) control.

Therefore, the conventional phase change disk is CLV.
Current CD players and CD-WOs (with constant linear velocity)
There was a drawback that it could not be played by the disk device.

[0019]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and an object thereof is rewriting that can be reproduced by a current CD player or a CD-WO disc device. Type optical disc and its recording / reproducing method.

[0020]

In the rewritable optical disk of the present invention, a surface is formed of a material having a different phase and a light reflectance different from each other due to a temperature change, and a signal representing an absolute time by modulating a pregroove signal. Is carved in advance.

In the rewritable optical disc recording method of the present invention, a laser power calibration area, a program memory area, a lead-in area, a program area and a lead-out area are provided at the same position as the CD-WO disk, and the lead-in area is In the recording method of the rewritable optical disc in which the identification code of the rewritable optical disc is engraved as the pre-groove signal in addition to the absolute time, the recorded information of each movement recorded in the program area when the TOC of the lead-in area is recorded. In addition, the identification code of the rewritable optical disc read from the pre-groove signal is recorded.

Further, according to the rewritable optical disc recording method of the present invention, in the rewritable optical disc recording method in which the TOC is not recorded in the lead-in area, an arbitrary number of movements are recorded from the start position of the program area. Then, record the lead-out information for a few seconds after the last recorded movement,
After recording the record information of the arbitrary number of movements in the program memory area, the start time and the end time of the lead-out information are recorded, and when the rewritable optical disc recorded in this way is additionally recorded or rewritten, A program that is recorded or overwritten from the start position or after any movement recorded as described above, and then the lead-out information is recorded for a few seconds after the last recorded movement, thus added or overwritten. The necessary part of the program memory area is rewritten or added to match the recording of the area.

Further, in the reproducing method of the rewritable optical disk of the present invention, in the reproducing method of the rewritable optical disk recorded by the above method, it is confirmed that the TOC is not recorded in the lead-in area, and the lead-in area is also recorded. Read the identification code of the rewritable optical disc engraved in the pre-groove, and then reproduce from the beginning of the program memory area to the position where the recording of the lead-out information first appears,
Based on the information, program reproduction or random reproduction of the program area is performed.

Further, the rewritable optical disc recording method of the present invention is the rewritable optical disc recording method in which TOC is recorded based on the recorded contents of the program memory area of the rewritable optical disc recorded by the above method. It is recorded or overwritten from the start position of the program area or from any movement already recorded, the lead-out information is recorded for a few seconds after the last recorded movement, and it is added or overwritten in this way. When rewriting or adding the necessary part of the program memory area to match the recording of the program area and then ejecting the disc from the device, record several minutes of lead-out information after recording the first lead-out information of the program area. Add or overwrite, and finally match the recording of the program memory area recorded like this. To those changing writing the TOC of the lead-in area.

Further, the recording method of the rewritable optical disk of the present invention is to restore the TOC-less partial recording disk by erasing the TOC portion of the rewritable optical disk in which the TOC is recorded in the lead-in area.

Further, in the recording method of the rewritable optical disc of the present invention, the movement number of the program area and the movement number of the program memory area of the rewritable optical disc are recorded as the same, and each movement number of the program memory area is recorded. The start time and the end time are recorded at a position of a predetermined absolute time.

[0027]

In the rewritable optical disk of the present invention, the signal representing the absolute time is previously engraved by the modulation of the pre-groove signal. Therefore, the rewritable optical disk based on the wobble signal obtained from the pre-groove is similar to the conventional CD-WO disk device. It can be recorded by CLV control.

Recording is performed as a phase change on the disk surface by optical modulation of laser power, and a signal is generated due to a change in light reflectance during reproduction. Therefore, the light used in a CD player or a CD-WO disk device is used. The signal can be read by the pickup.

Further, a rewritable optical disc recorded by the recording method for a rewritable optical disc of the present invention and having no TOC recorded in the lead-in area is a partially recorded CD-
Since the record information of the program area is recorded in the program memory area like the WO disc, the current CD-W
It can be played back by an O disk device.

At the time of reproduction, it is detected from the wobble signal of the pre-groove that the optical disk is a rewritable type optical disk, and the recording in the program memory area is reproduced until the recording of the lead-out information appears. Program playback and random playback are possible.

Further, the rewritable optical disc recorded by the recording method of the rewritable optical disc of the present invention and having the TOC recorded in the lead-in area is a CD (compact disc).
Similarly to the above, TOC, recording of each movement, and recording of lead-out information are arranged in order from the inner peripheral side, so that they can be reproduced by a general CD player.

[0032]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a rewritable optical disk device for carrying out the present invention. In the figure, reference numeral 1 denotes a rewritable optical disc, which uses a chalcogenide G
_e -T _e -S _b recording film is provided on the surface. Also,
The pre-groove that guides the light spot is formed in a waveform, and a signal indicating the absolute time or a signal indicating the disc type is preliminarily carved by the modulation of the pre-groove signal.

The rewritable optical disk 1 has a spindle motor 2
It is clamped to a turntable fixed to the rotating shaft of. The spindle motor 2 rotates the rewritable optical disk 1, and the focus error signal (FE) and the tracking error signal (TE) are input to the servo circuit 4 from the light receiving element of the optical pickup 3. The servo circuit 4 generates a tracking coil supply current from the tracking error signal and also extracts a wobble signal (WB).

Further, the servo circuit 4 generates a focusing coil supply current from the focus error signal. The laser spot traces the pre-groove of the waveform when the current is passed through the tracking coil of the actuator of the optical pickup 3, and the focus of the laser spot is adjusted to the signal surface of the rewritable optical disc by the current passed through the focusing coil. Be done.

A wobble signal (WB) having the same period as the pre-groove signal is input to the ATIP decoder 6 and AT
The IP (absolute time) signal is demodulated and output to the microcomputer 12. With this ATIP, the microcomputer 12 recognizes the position of the laser spot on the rewritable optical disk.

The optical pickup 3 is sent in the radial direction of the rewritable optical disk by a linear motor (not shown). The linear motor is supplied from the servo circuit 4 with a current generated from the DC component of the tracking error signal during normal recording or reproduction. Further, the laser spot of the optical pickup 3 can be moved to an arbitrary position on the rewritable optical disc instructed by the microcomputer 12 by the actuator and the linear motor.

The wobble signal (WB) also indicates the linear velocity of the rewritable optical disk, and the CLV circuit 5 controls the current of the spindle motor 2 based on this signal and C
LV (constant linear velocity) control is performed.

The laser diode of the optical pickup 3 is supplied with a current by the laser diode driver 7, and the current is modulated by the output of the EFM encoder 11, and the laser light emitted from the laser diode is converted into an EFM signal on the rewritable optical disk. A corresponding pit row is formed.

The EFM encoder 11 has an optical input terminal 8
Either the digital signal obtained by converting the optical signal input from the optical converter 9 by the photoelectric converter 9 or the digital input obtained by converting the analog input by the AD converter 10 is selected and input to the EF.
Modulated into M signal. At that time, the signal input from the microcomputer 12 is incorporated into the subcode of the EFM signal. The EFM signal modulates the output current of the laser diode driver 7 as described above.

The microcomputer 12 has a built-in ROM and RAM and controls the entire apparatus. In addition, a signal is input from the keyboard 13 and the display 14
A signal is output to display the operating status of the device.

The recording operation of the rewritable optical disk has been described above. When the signal recorded on the rewritable optical disk is reproduced, the same operation as the CD player is performed. At that time, the laser diode driver 7 outputs a constant current, and the light receiving element of the optical pickup 3 obtains an RF signal, a tracking error signal (TE) and a focus error signal (FE) from the reflected light from the pit train.

At this time, the signal obtained by the light receiving element of the optical pickup 3 is amplified and shaped by the RF amplifier 15 and input to the EFM decoder 16, where the audio digital signal and the sub code are demodulated. The audio digital signal is converted into an analog signal by the DA converter 17 and output as an analog audio signal. Further, the audio digital signal output of the EFM decoder 16 is converted into a digital optical signal by the electro-optical converter 18 and output from the optical output terminal 19. Further, the demodulated subcode is input to the microcomputer 12.

Next, the recording and reproducing operations of the apparatus will be described with reference to FIGS. First, using a blank rewritable optical disc, as shown in FIG. 2, each movement (TNO. 1, TNO. 2, TNO.
TNO. 3) is recorded, and then the start time and end time of each movement recorded in the program area are recorded in the first block to the third block of the program memory area. Incidentally, the absolute time of the disc at the recording position is shown in the lower part of the figure as a numerical value of minutes: seconds: frames.

When the key for ejecting the disc from the device is pressed in this state, the lead-out information (AA) is recorded for 10 seconds after the last recorded movement, and the recorded lead-out position information is stored in the program memory area. The disc is taken out after being recorded in the fourth block ().

Table 1 of FIG. 6 shows a format of the above recording in the program memory area. Recording is performed by the subcode Q as in the CD. Column A of the table is ADR similar to CD, and column B is POINT (movement number).

Columns C, D and E are minutes, seconds and frames of each movement end time, and columns F, G and H are minutes, seconds and frame of each movement start time.

Overwriting (rewriting) or additional writing can be performed from the beginning of the program memory area of the disc thus recorded or from the beginning of any recorded movement.
In that case, when the disc is taken out, the lead-out information is recorded for 10 seconds next to the last overwritten or additionally recorded movement, and the program memory area of the program memory area matches the information of each movement up to the lead-out information. The record is rewritten.

The disc thus recorded can be reproduced based on the record information in the program memory area not only by the above-mentioned device but also by the existing CD-WO disc device.

Next, the operation of writing TOC information on the disc recorded as shown in FIG. 2 will be described. When the disk is inserted into the device and the TOC write key is pressed, as shown in FIG.
The lead-out information for 2 seconds is additionally recorded, and then the TOC in the format shown in Table 2 of FIG. 7 is recorded by transcribing from the record information of the program memory area in the lead-in area.

In the record shown in Table 2, A = 05 and B
= D0 indicates a rewritable optical disc, C in this line is a recording power code, D is a disc use code, E is always 00, and F, G, and H are lead-in recording start times (minutes, seconds, Frame). The contents of this line are transcribed from the ATIP special code of the pre-groove in the lead-in. In this state, a general CD player can reproduce the TOC information. When this disc is loaded into the above device, it is recognized as a rewritable optical disc, and rewriting or the like can be performed.

Next, the TOC recorded as shown in FIG.
The case of rewriting the second and subsequent movements while leaving only the first movement of the attached disc will be described. Rewrite the second movement,
If the third movement is not recorded thereafter, the lead-out information is recorded for 10 seconds next to the second movement in the program area, and the block of Table 1 is rewritten as the block of Table 3 in FIG. 8 in the program memory area.

Finally, when the user presses the key for ejecting the disc from the apparatus, the lead-out information for 1 minute and 50 seconds is rewritten and recorded next to the above-mentioned lead-out information for 10 seconds, and thereafter,
The TOC is shown in FIG.
As shown in Table 4 above, the data is rewritten and recorded, and the disc is ejected from the apparatus. In this state, it can be reproduced by a general CD player.

When erasing the TOC of the rewritable optical disc with TOC recorded as shown in FIG. 4, when the disc is put in the apparatus and the TOC erasing key is pressed, the light modulation output becomes the crystallization level and the TOC portion is removed. Crystal state (becomes bright)
Thus, as shown in FIG. 5, the state is the same as that of the partial recording disk without TOC. If the TOC is erased in this way, the TOC rewriting is omitted at the time of rewriting and the rewriting time is shortened.

[0054]

According to the rewritable optical disc and the recording / reproducing method of the present invention, reproducible recording can be performed by a CD-WO disc device or a CD player by only partially changing the format of the CD-WO disc. The rewriting becomes possible.

That is, the recording disc with TOC is the device shown in the embodiment, the CD-WO disc device or the CD.
It can be played on the player. The TOC-less recording disc can be rewritten, additionally recorded, and reproduced by the device shown in the embodiment, and can be reproduced by the CD-WO disc device. In this case, the TOC cannot be played on the CD player.
Since it is not necessary to record the lead-out, it is convenient for applications with many rewrites.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of a rewritable optical disk device used in an embodiment of the present invention.

FIG. 2 is a diagram showing an example of a recording state of a rewritable optical disc in the same example.

FIG. 3 is a diagram showing an example of a recording state of a rewritable optical disc in the same example.

FIG. 4 is a diagram showing an example of a recording state of a rewritable optical disc in the same example.

FIG. 5 is a diagram showing an example of a recording state of a rewritable optical disc in the same example.

FIG. 6 is a diagram showing an example (Table 1) of a recording format of a rewritable optical disc in the same example.

FIG. 7 is a diagram showing an example (Table 2) of a recording format of a rewritable optical disc in the same example.

FIG. 8 is a diagram showing an example (Table 3) of a recording format of a rewritable optical disc in the example.

FIG. 9 is a diagram showing an example (Table 4) of a recording format of a rewritable optical disc in the same example.

FIG. 10 is a graph showing the reflectance of a Ge—Te—Sb phase change optical recording film.

FIG. 11 is a diagram showing a recording state of an optical disc using a Ge—Te—Sb system phase change optical recording film.

FIG. 12 is a diagram showing an example of a recorded state of a conventional CD-WO disc.

[Explanation of symbols]

 1 Rewritable Optical Disk 2 Spindle Motor 3 Optical Pickup 4 Servo Circuit 5 CLV Circuit 6 ATIP Decoder 7 Laser Diode Driver 8 Optical Input Terminal 9 Photoelectric Converter 10 AD Converter 11 EFM Encoder 12 Microcomputer 13 Keyboard 14 Display 15 RF Amplifier 16 EFM decoder 17 DA converter 18 Electro-optical converter 19 Optical output terminal

Claims (7)

[Claims] 1. A rewritable optical disc in which a surface is formed of a material having a different phase and a different light reflectivity due to a temperature change, and a signal representing an absolute time is previously marked by modulation of a pregroove signal. 2. A laser power calibration area, a program memory area, a lead-in area, a program area and a lead-out area are provided at the same position as the CD-WO disc, and the pre-groove signal of the lead-in area is written in addition to the absolute time. The rewritable optical disc recording method according to claim 1, wherein the identification code of the rewritable optical disc is engraved.
A recording method for a rewritable optical disc, characterized in that an identification code of the rewritable optical disc read from the pregroove signal is recorded in addition to the recording information of each movement recorded in the program area when C is recorded. 3. The rewritable optical disc recording method according to claim 1, wherein no TOC is recorded in the lead-in area.
After recording an arbitrary number of movements from the start position of the program area, recording the lead-out information for a few seconds after the last recorded movement, and after recording the recording information of the arbitrary number of movements in the program memory area When the start time and end time of the lead-out information is recorded and the rewritable optical disc recorded in this way is additionally recorded or rewritten, it is recorded from the start position of the program area or after the arbitrary movement recorded as described above. Or, overwrite and record the lead-out information for a few seconds after the last recorded movement, and rewrite the necessary part of the program memory area to match the recording of the added or overwritten program area in this way or A rewritable optical disc recording method characterized by additionally writing. 4. A method of reproducing a rewritable optical disc recorded by the method of claim 3, wherein the TO is provided in the lead-in area.
Confirm that C is not recorded, read the identification code of the rewritable optical disc engraved in the pregroove of the lead-in area, and then read from the beginning of the program memory area to the position where the recording of lead-out information first appears. A reproducing method of a rewritable optical disk which reproduces and performs program reproduction or random reproduction of a program area based on the information. 5. A recording method for a rewritable optical disc in which a TOC is recorded based on the recorded contents of the program memory area of the rewritable optical disc recorded by the method of claim 3, wherein the start position of the program area or already recorded Is recorded or overwritten from the next movement, and the lead-out information is recorded for a few seconds after the last recorded movement.
When rewriting or adding the necessary part of the program memory area to match the recording of the program area overwritten or overwritten in this way, and then ejecting the disc from the device, the first lead-out information of the program area should be recorded. Continuously add or overwrite the lead-out information for several minutes, and finally add the TO of the lead-in area to match the recording of the program memory area recorded in this way.
A rewritable optical disk recording method, characterized in that C is rewritten. 6. A recording method for a rewritable optical disc, wherein the TOC portion of the rewritable optical disc according to claim 1 in which the TOC is recorded in the lead-in area is erased to restore the TOC-less partial recording disc. 7. The rewritable optical disc of claim 1, wherein the movement number of the program area and the movement number of the program memory area are recorded as the same, and each movement number of the program memory area and its start time and end time are determined in advance. A recording method for a rewritable optical disk, which is characterized by recording at a position of a specified absolute time.