JP2000231722A - Optical disk, information recording method, and reproducing device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to reproduce phase pit data without deteriorating the playability even in the case of reproduction by an existing optical disk reproducing device by wobbling tracks in a lead-out area of an optical disk and recording additional information therein. SOLUTION: Among an lead-in area 101, a data area 102, and a lead-out area 103, prescribed information is superimposed and recorded on the lead-out area 103 in addition to information by a fixed data pattern presenting that this area is an lead-out area. Moreover, as for a form of a phase pit string in each area, a pit string 201 in the lead-in area and a pit string in the data area 202 have their pits arranged in the same direction as the tracks, while the lead-out area 203 has the pits arranged snaking with respect to the direction of the tracks. This snaking cycle should be such as its carrier frequency becomes constant in frequency conversion at the time of being reproduced at a prescribed linear velocity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disk having information on the position or length of a phase pit and a reproducing apparatus therefor. In particular, in order to prevent illegal copying from a reproduced disk to a recording disk, a phase pit train is formed. The present invention relates to an optical disk capable of recording additional information that cannot be physically copied by so-called wobbling, an information recording method, and a reproducing apparatus therefor.

[0002]

2. Description of the Related Art FIG. 2 shows a conventional reproduction type optical disk represented by a DVD. FIG. 2 (a) shows a sectional view of an area divided according to the content of recording information, and FIG. FIG. 4 is a diagram schematically showing a part of a phase pit row in a region.

As shown in FIG. 1A, an optical disc 1 is divided into a lead-in area 101, a data area 102, and a lead-out area 104. In the data area 102, user information is recorded. In the lead-out area 104, a fixed data pattern indicating that the area is a lead-out area is recorded. The shape of the phase pit row in each area is such that the pit row 201 in the lead-in area, the pit row 202 in the data area, and the pit row 204 in the lead-out area are the same in the track direction as shown in FIG. Pits are arranged in the direction.

FIG. 3 is a circuit block diagram of a conventional disk reproducing apparatus for reproducing the optical disk as shown in FIG. In the figure, 11 is an optical pickup comprising a light source, a photodetector, an objective lens and an actuator for displacing the position of the objective lens, 14 is a preamplifier, 15 is a demodulation circuit for performing binarization of a reproduction signal, clock reproduction and signal demodulation, 16 is a decoder for performing descrambling and error correction, 17 is a servo signal generation circuit for generating a focus error signal and a tracking error signal, 18 is a driver for driving an actuator in the optical pickup, and 23 is a microcomputer.

The light reflected from the optical disk 1 enters a split photodetector in the optical pickup 11 and is converted into an electric signal 401. The electric signal 401 is input to the preamplifier 14 and the addition reproduction RF signal 40
2 and a divided reproduction signal 405 for generating a servo signal. The addition reproduction RF signal 402 is input to the demodulation circuit 15 and binarized, and then a channel clock is reproduced by a PLL. For example, for reproduction of a DVD disk, 8-1
Demodulation of six modulations is performed. The demodulated data 403 is further input to the data decoder 16 and descrambled,
The error correction is performed, and the reproduction data 404 is obtained.

On the other hand, a divided reproduction signal 4 for generating a servo signal
05 is input to the servo signal generation circuit 17, and a focus error signal 406 and a tracking error signal 407 are generated. Regarding the servo signal generation method, the focus error signal is an astigmatism method generated by the difference of the diagonal sum of the four-division photodetector, and the tracking error signal is the diagonal sum of the four-division photodetector for reproducing a DVD disk, for example. Is well known. The focus error signal 406 and the tracking error signal 407 drive the actuator in the optical pickup 11 via the driver 18, whereby the light spot is traced to the center of the track with the optical spot focused on the optical disk pit surface.

The above-mentioned DVD disk and its reproducing apparatus are described in, for example, Journal of the Institute of Image Information and Television Engineers, Vol.
51, No. 7, pp. 941-974.

[0008]

In a DVD-ROM, strong copy protection is applied in terms of data in order to prevent illegal copying, but it is ineffective when a dead copy is made to a DVD-R. In order to prevent this, additional information that can be recorded only on the ROM disk and cannot be physically recorded on the DVD-R disk is required.

However, when the configuration of the optical disk is changed, compatibility with the optical disk reproducing device already shipped on the market must be ensured. That is, the optical disk with the additional information must be able to reproduce at least information other than the added information by the conventional optical disk reproducing apparatus.

SUMMARY OF THE INVENTION An object of the present invention is to provide an information recording method for an optical disc which adds information to the current optical disc and does not adversely affect the playability of a conventional optical disc reproducing apparatus. To provide a playback device for playing back the.

[0011]

In order to achieve the object of the present invention, in an optical disk according to the present invention, only a phase pit row in a lead-out area in a data area section is wobbled by a predetermined modulation method. The optical disk reproducing apparatus according to the present invention includes a circuit for reproducing a wobble signal from a tracking error signal, and an optical pickup feed control system for transferring the optical pickup to a lead-out area according to a command from a host.

Thus, even when the conventional optical disc reproducing apparatus reproduces the optical disc on which information is recorded according to the present invention, the read-out area is not reproduced by a general reproducing apparatus. The street can be reproduced. When an optical disk on which information has been recorded is reproduced by the optical disk reproducing apparatus according to the present invention, the optical pickup is positively transferred to the lead-out area in accordance with a command from the host, and wobble reproduction is performed, thereby recording the recorded additional information. Can be reproduced.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of a reproduction type optical disc according to the present invention. FIG. 1 (a) is a view showing a cross section of an area divided by the contents of recording information, and FIG. 1 (b) is a phase pit in each area. It is the figure which showed a part of column typically. 2, the same components as those in FIG. 2 are denoted by the same reference numerals, and the description thereof will be omitted.

As shown in FIG. 1A, the optical disk 1 is divided into a lead-in area 101, a data area 102, and a lead-out area 103. Of these, the lead-out area 103 has In addition to information with a fixed data pattern indicating that it is a lead-out area,
Additional information to be described later is superimposed and recorded.

The shape of the phase pit row in each area is the pit row 2 in the lead-in area as shown in FIG.
01 and the pit row 202 in the data area have pits arranged in the same direction as the track direction, while the pit row 203 in the lead-out area is arranged meandering in the track direction. The meandering cycle is converted into a frequency at the time of performing reproduction at a predetermined linear velocity, and the carrier frequency is made constant. Information is recorded in the meandering component by modulation such as frequency modulation. The frequency is set to be sufficiently lower than the phase pit repetition frequency and sufficiently higher than the tracking servo band.

In the pit row of the lead-out area, values such as the depth and width of the phase pits are different from the physical characteristics of the lead-in area and the data area except that the track center is meandering, that is, what is called wobbling. There is no difference.

FIG. 4 is a circuit block diagram showing an example of an optical disk reproducing apparatus according to the present invention, which is suitable for reproducing additional information from the above-mentioned optical disk. In the figure, the same reference numerals are given to the same functional portions as those shown in FIG. 2, and the description is omitted here.

In FIG. 1, reference numeral 12 denotes an optical pickup 11
A transport mechanism for mechanically coupling the motor and the optical pickup; 19, a BPF; 20, a demodulation circuit for performing clock reproduction and signal demodulation such as frequency modulation; A decoder 22 for performing descrambling and error correction is a transfer control circuit for controlling the position of the optical pickup 1.

Hereinafter, an operation different from the conventional example will be described. Of the signals generated by the servo signal generation circuit 17, the tracking error signal 407 is input not only to the driver 18 but also to the BPF 19. The frequency characteristic of the BPF is such that the wobble frequency when the optical disk is reproduced at a predetermined linear velocity is passed, and the frequency corresponding to the presence or absence of the phase pit (the band of the added reproduction RF signal 402) and the band of the tracking servo are sufficiently attenuated. Shall be allowed. After the output 409 of the BPF is input to the demodulation circuit 20 and binarized, the channel clock is reproduced by the PLL. For example, in the case of a frequency-modulated signal, demodulation of the frequency modulation is performed. The demodulated data 410 is further input to the data decoder 21 and subjected to descrambling and error correction to obtain reproduced data 411.

On the other hand, the microcomputer 23 acquires information on the lead-in area at the start of reproduction, for example, and stores the start position information of the lead-out area in this information. Decoder 1
When an additional information reproduction request signal 414 from the user 6 or an additional information reproduction request signal 415 from the user is input, a control signal 412 for positioning the optical pickup in the lead-out area is output to the transfer control circuit 22. I do.
In this way, by positioning the optical pickup in the lead-out area and performing the wobble reproduction, it is possible to reproduce the additional information. FIG. 5 shows an operation flowchart of the wobble reproduction described above.

By wobbling a track, additional information can be recorded, but a new problem arises in that the quality of the reproduced RF signal of the original phase pit information is degraded. However, since the optical disk according to the present invention is configured to wobble the lead-out area, there is no actual harm.

Next, the operation when the optical disk according to the present invention shown in FIG. 1 is reproduced by an optical disk reproducing apparatus which has already been shipped will be described.

A general optical disk reproducing apparatus reproduces information of a lead-in area of a disk at the time of starting reproduction after mounting the disk, and stores table of contents (TOC) information and the like. After reproducing necessary information from the lead-in area, data reproduction of the data area is performed. Also,
At the time of access, the access distance is calculated from the TOC information, and the access is performed. In data area playback,
When the data reproduction at the data area end position (indicated in the TOC information) is completed, the operation of terminating the reproduction of the disc is performed.

As described above, the operation of reproducing the lead-out area is not usually performed.

Therefore, the optical disk of the present invention can reproduce phase pit data without deteriorating its playability even when reproduced by a conventional optical disk reproducing apparatus. When played back by a playback device, besides the playback of phase pit data,
The additional information recorded by wobbling can be reproduced.

FIG. 6 is a diagram showing the configuration of an optical disk according to a second embodiment of the present invention, which is an example applied to a two-layer DVD. In the figure, the same components as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In FIG. 5A, reference numeral 105 denotes a first layer middle area, 106 denotes a second layer middle area, 107 denotes a data area, and 108 denotes a lead-out area.

In this embodiment, as shown in FIG. 2B, the pit row 20 in the middle layer of the first layer among the above-mentioned regions is used.
Wobbling only 5 This is because the middle area of a two-layer disc is not reproduced in a general optical disc reproducing apparatus as in the lead-out area of a one-layer disc, and thus there is no adverse effect due to wobbling of a phase pit row.

When the phase pit row of the lead-out area of the first embodiment or the middle layer of the first layer of the second embodiment is wobbled, the entire area may be wobbled. There is no difference in the effect of the present invention even if only a part of is wobbling.

FIG. 7 is a diagram showing the configuration of an optical disk according to a third embodiment of the present invention, and is a schematic diagram showing the center line of a wobbled track over several adjacent tracks. For comparison, FIG. 8 shows a similar track configuration diagram in the first and second embodiments of the present invention. In FIG.
The spatial phase between adjacent tracks does not match, and when viewed locally, the track pitch is Tp1 <Tp2 and is not constant. This is because the spatial repetition period of the wobbling is set so that the reproduction carrier frequency becomes constant when the disk is rotated at a constant linear velocity.

On the other hand, in the track center line of the present embodiment, the spatial phases match between adjacent tracks, and the track pitch is constant at Tp0 at any position. In order to match the phases in this manner, the spatial repetition period of wobbling is set so that the reproduction carrier frequency becomes constant when the disk is rotated at a constant angular velocity, and modulation such as frequency modulation is performed. The data modulated by the method is completed by one rotation of the disk, and can be achieved by repeatedly wobbling the track with the modulated data of one rotation.

In this embodiment, although the data amount of the additional information that can be recorded is small, there is no change in the track pitch, so that the deterioration of the playability of the disk reproduction can be minimized. For this reason, the track wobbling according to the present embodiment can be performed not only in the lead-out area but also in the lead-in area and the data area. As a result, there is an advantage such as immediate reproduction of additional information.

[0033]

As described above, the optical disk according to the present invention records additional information by wobbling tracks in the lead-out area. Further, the optical disk reproducing apparatus according to the present invention accesses the lead-out area and reproduces wobbling data based on the lead-out start position information described in the lead-in area.

Thus, the optical disk of the present invention can reproduce phase pit data without deteriorating its playability even when reproduced by a conventional optical disk reproducing apparatus. When the information is reproduced by the optical disk reproducing device, the additional information recorded by wobbling can be reproduced in addition to the reproduction of the phase pit data. Further, according to the present invention, it is possible to provide a read-only disc that cannot physically record all data on a recording disc.

[Brief description of the drawings]

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

FIG. 2 is a schematic diagram showing a conventional optical disc.

FIG. 3 is a circuit block diagram of a conventional optical disc reproducing apparatus.

FIG. 4 is a circuit block diagram showing a position embodiment of an optical disc reproducing apparatus according to the present invention.

FIG. 5 is an operation flowchart illustrating a part of the operation in FIG. 4;

FIG. 6 is a schematic view showing a second embodiment of the optical disc according to the present invention.

FIG. 7 is a track configuration diagram showing a third embodiment of the optical disc according to the present invention.

FIG. 8 is a track configuration diagram in a first embodiment of the optical disc according to the present invention.

[Explanation of symbols]

Reference numeral 1 denotes a reproduction type optical disk, 101 denotes a lead-in area, 1
02: Data area, 103, 104: Lead-out area, 105, 106: Middle area, 201 to 208: Phase pit train, 11: Optical pickup, 17: Servo signal generation circuit, 19: Band pass filter, 20 demodulation circuit, 21 decoder.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G11B 20/12 G11B 20/12 (72) Inventor Hiroshi Endo 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Co., Ltd. F-term in Hitachi Information & Video Media Division (Reference) 5D029 JB05 JB31 JB42 WA18 5D044 AB10 BC02 CC04 DE40 DE50 FG19 5D090 AA01 BB02 BB12 CC04 CC14 GG03 GG21 LL08

Claims (8)

[Claims] 1. An optical disc on which fixed information is recorded by a phase pit row, a phase pit row in a fixed area in which the fixed information is repeatedly recorded is arranged in a meandering manner in a track direction. An information recording method characterized by recording information. 2. The information recording method according to claim 1, wherein the fixed area is a lead-out area. 3. The information recording method according to claim 1, wherein the optical disc is a two-layer disc, and the fixed area is a middle area. 4. The information recording method according to claim 1, wherein the phase pit row is meandering in the track direction only in the fixed area. 5. The information recording method according to claim 1, wherein the second information is completed by one rotation of the disk, and the spatial phase relationship between adjacent meandering phase pit rows is always in phase. Information recording method. 6. An optical disk on which fixed information is recorded by a sequence of phase pits, wherein a phase pit sequence in a fixed area where the fixed information is repeatedly recorded is arranged in a meandering manner in a track direction. An optical disc on which information is recorded. 7. An optical disk according to claim 6, wherein the second information is completed by one rotation of the disk, and the spatial phase relationship between adjacent meandering phase pits is always in phase. . 8. A reproducing means for reproducing an optical disk comprising a lead-in area, a data area and a lead-out area, wherein the phase pit row in the lead-out area is arranged in a meandering manner in the track direction. And control means for controlling the reproducing means to reproduce the lead-out area based on the start position information of the lead-out area recorded in the lead-in area. An optical disc reproducing apparatus characterized by the following.