JP3209126B2 - Optical recording medium, optical disk reproducing apparatus, and optical disk reproducing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical recording medium, an optical disk reproducing apparatus, and an optical disk reproducing method. About.

[0002]

2. Description of the Related Art Many conventional CDs, CD-ROMs and the like do not have physical restrictions, apart from legal restrictions, especially for reading and re-recording of recorded data.
Once the optical recording medium is obtained, all data can be repeatedly reproduced or re-recorded on another recording medium. In addition, in a game optical disk, a special wobbling bit is formed at the innermost portion of an optical recording portion, so that the special code can be reproduced only by a dedicated reproducing device to protect copyright.

[0003]

By the way, as the recording density of the optical recording medium increases and the data compression technology advances, an extremely large amount of data can be recorded. For example, a DVD (Digital Video Disk: digital In a versatile disc, etc., about 4.7 GB of data can be recorded on one disc. In addition, audio, still images,
Various types of information such as moving images, game programs, and computer programs are recorded on optical recording media and provided.

[0004] However, no measures have been taken so far to protect the copyright of the data recorded on the optical recording medium and selectively allow reproduction and re-recording of the recorded data. The method of restricting reproduction to a dedicated player like a game disk is inconvenient in terms of use of an optical recording medium, and cannot be said to be suitable for DVD, DVD-ROM, and the like. Therefore, the recording data on the optical recording medium is reproduced and re-recorded without limitation, and there is a possibility that the recording of information or data having a protection value on the optical recording medium is hesitant.

Accordingly, the present invention is known as a bar code recording portion provided for recording auxiliary information on an inner peripheral portion of an optical disk, in addition to main information recorded as optical information on an optical recording medium. It is an object of the present invention to provide an optical recording medium and an optical disk reproducing apparatus having an additional function such as protection of copyright and permission of selective reproduction of recorded information using a so-called burst cutting area (BCA).

[0006]

In order to achieve the above object, according to the present invention, control information for reproducing main information is recorded in advance in a BCA as an auxiliary information recording portion of an optical recording medium, and the control information from the BCA is recorded. The main information is reproduced based on the reproduction information. At this time, an address recording area of at least one sector is left on the track provided with the BCA, and this address can be reproduced at the time of reproduction. In one aspect of the present invention, a BCA provided in advance by superposing a bar code on an optical recording portion at the stage of manufacturing an optical recording medium, and a user obtaining the optical recording medium and then superimposing it on another optical recording portion by a predetermined organization. Since the BCA has a write-once BCA in which a bar code can be provided, the information of the BCA can be provided in two stages, which is convenient for license use on condition that payment of a fee is made.

That is, according to the present invention, there is provided an optical recording medium in which main information is optically recorded along a concentric or spiral track, and the auxiliary information includes a plurality of auxiliary information near the innermost circumference of the concentric or spiral track. in those recorded as a bar code superimposed on the divided optical recording portion in the sector, the bar code is arranged in the inside first annular portion over a viewed 360 degrees from the rotation center of the optical recording medium, and the first among the plurality of sectors of the annular portion, arranged in the portion excluding the at least one sector, further wherein
A new barco is added inside or outside the first annular portion in the radial direction.
Have at least one sector for appending code
An optical recording medium having a second annular portion is provided.

Further, according to the present invention, there is provided an optical recording medium in which main information is optically recorded along a concentric or spiral track, wherein the auxiliary information is recorded on a plurality of concentric or spiral tracks near the innermost circumference. In the case where the barcode is recorded as a barcode superimposed on an optical recording portion divided into sectors, the barcode is arranged in an annular portion extending 360 degrees from the center of rotation of the optical recording medium, and among the plurality of sectors, be arranged in a portion excluding the at least one sector, said bar code
User-specified information, rental information, area-specified information
Information, language designation information, usage designation information, and usable period designation information
Information, available number of times specification information, available player specification information
Information, resolution specification information, and layer specification information
Is provided.

Further, according to the present invention, there is provided an optical recording medium in which main information is optically recorded along a concentric or spiral track, and the auxiliary information includes a plurality of auxiliary information near an innermost circumference of the concentric or spiral track. in those recorded as a bar code superimposed on the divided optical recording portion in the sector, the bar code is arranged in the inside ring-shaped portion when viewed from the center of rotation that cotton 360 degrees of the optical recording medium, and pre-Symbol among the plurality of sectors of the ring <br/> shaped portion, be arranged in a portion excluding the at least one sector, said bar code
As copyright owner information, copyright number information, date of manufacture,
Manufacturer information, sale date information, dealer information, seller information,
User information, use number information, use set number information
An optical recording medium on which at least one is recorded is provided.

According to the present invention, the main information is concentric circles or
Optically recorded along the spiral track, the first auxiliary
The information is the innermost circumference of the concentric or spiral track
Optical recording divided into multiple sectors on multiple nearby tracks
Recorded at the time of manufacture as the first barcode over the part
And the first bar code is rotated by the optical recording medium.
Arranged in an annular part extending 360 degrees from the center,
And among the plurality of sectors in the annular portion,
Are arranged in a portion excluding one sector, and the second auxiliary information
Report is near the innermost circumference of the concentric or spiral track
The same track as the plurality of tracks or a plurality of different tracks
Over the optical recording portion divided into multiple sectors of the track
It is additionally recorded after manufacture as a second barcode,
Whether the second barcode is the rotation center of the optical recording medium
Same or different from the annular part over 360 degrees
The plurality of cells arranged in a portion and within the annular portion.
Of the sector except for at least one sector.
From the optical recording medium arrayed, an optical beam is
Irradiates the light and detects the reflected or transmitted light.
Disc playback method, comprising reading an address from the sector.
Issuing the first auxiliary information using the address.
Reading both information and said second auxiliary information;
Using both the first auxiliary information and the second auxiliary information
Determining the current state of the optical disc;
The main information is selectively executed in accordance with the current
And a reproducing method for the optical disk .

According to the present invention, the main information is optically recorded along a concentric or spiral track, and the first auxiliary information is recorded on a plurality of sectors of a plurality of tracks near the innermost circumference of the concentric or spiral track. The first barcode is recorded at the time of manufacture as a first barcode over the divided optical recording portion, and the first barcode is arranged in an annular portion extending 360 degrees from the center of rotation of the optical recording medium,
And a second auxiliary information is arranged in a portion excluding at least one sector among the plurality of sectors in the annular portion.
Report is near the innermost circumference of the concentric or spiral track
The same track as the plurality of tracks or a plurality of different tracks
Over the optical recording portion divided into multiple sectors of the track
It is additionally recorded after manufacture as a second barcode,
Whether the second barcode is the rotation center of the optical recording medium
Same or different from the annular part over 360 degrees
A light beam is applied to the optical recording medium from an optical recording medium arranged in a portion excluding at least one of the plurality of sectors in the annular portion. An optical disk reproducing method for detecting reflected light or transmitted light, comprising: reading an address from the sector; and using the address to read the first auxiliary information.
Reading both information and said second auxiliary information;
Comparing the first auxiliary information with the second auxiliary information,
Are inconsistent with each other,
By using the second auxiliary information preferentially, the current
Determining the state of the optical disc and according to the current state of the optical disc.
Selectively reproducing the main information,
The optical disc reproducing method having is provided.

[0012]

[0013]

Embodiments of the present invention will be described below with reference to the drawings, together with preferred embodiments. FIG. 1 is a schematic plan view of an optical recording medium according to the present invention.
FIG. 2 shows the BC provided on the optical recording medium according to the present invention.
It is a figure which shows the head part and end part of A9. The BCA 9 is provided on the innermost peripheral portion 1S of the optical recording portion 1R of the optical disc 1 as an optical recording medium. 8A, 8B, 8C,
Reference numerals 8D and 8E denote five spiral or concentric tracks provided on the innermost peripheral portion 1S of the optical disk 1. Each bar of the BCA 9 is provided so as to be perpendicular to these five tracks, that is, in the radial direction of the optical disc 1 and so as to cross these five tracks. Actually, B over 5 or more tracks, for example, several tens of tracks
CA9 can be provided. Note that the BCA 9 is an optical recording part 1 that is stamped when the optical disc 1 is manufactured.
After the R track is formed, the innermost track 1
The reflective film of the disk is selectively burned off by a high-power laser such as a YAG laser over a plurality of tracks of S, and a bar code is formed in the circumferential direction of the optical disk. PCA
(Post-cutting area). BCA9
Is one of the discs manufactured by mass stamping
It differs from a normal optical recording track in that unique information can be recorded for each sheet. The data amount is about 180 bytes in one round.

In FIG. 2, a portion 72- shown in black
.., 72-2, 72-3,... Are portions of the optical disk from which the reflective film has been removed, and portions 74-1, 7 between them are shown.
4-2, 74-3... Are portions where the reflection film is not removed. Portions 72-1 and 72 from which the reflective film has been removed
.. Are referred to as black bar portions, and portions 74-1, 74-2, 74-3,.
Is called a white bar. The pitch between adjacent black bars along the circumferential direction of the track (the horizontal direction indicated by the arrow in FIG. 2) is 1T, 2T, or 3T. 1T is the circumferential length of one sector, and in one round near the innermost peripheral portion 1S of the optical recording portion 1R of the optical disk 1, the portion 75 where no black bar is provided has a length of one sector or more. Exist across. This is because at least one sector 76 is completely left in each of the plurality of tracks provided with the barcode, and the address and the synchronization signal can be reproduced therefrom. The area where the black bar is not provided is at least one sector. However, in order to decode the address accurately, one area constituting one ECC block is used.
Desirably, there are six sectors.

FIG. 3 shows one embodiment of the optical recording medium of the present invention in which BCAs are provided in two regions, respectively. One of the BCAs is provided with a barcode at the time of manufacturing the optical disc 1, and the other is provided by the user when the optical disc 1 is manufactured.
Is for recording the barcode after purchase. That is, the first barcode 77 is arranged in the first annular portion 78 extending 360 degrees from the center of rotation of the optical disc 1, and at least one sector 76 </ b> A among a plurality of sectors in the first annular portion 78. It is arranged in the excluded part,
Further, radially inward or outward of the first annular portion 78,
There is a second annular portion 80 having at least one sector 76B for additionally writing a second barcode 79.

The BCA in the first annular portion 78 is provided when the optical disc 1 is manufactured, and is a premastered (preformatted) area. On the other hand, the area of the second annular portion 80 where the barcode is recorded is an additional recording area. FIG.
In the additional recording area of the second annular portion 80,
9 is recorded, but since the bar code 79 is not recorded at the time of manufacture, the second annular portion 80 is recorded.
The black bar is not at this time. When viewed in the signal reproduction direction of the optical disk indicated by the arrow in FIG.
It is a preferred embodiment that the annular portion 78 is arranged immediately after at least one sector 76A.

FIG. 4 shows another embodiment of the optical recording medium of the present invention in which two BCAs as a premastered area and a write-once area are respectively provided in two areas. That is, the first barcode 81 is formed by a limited portion 82 of an annular portion extending 360 degrees from the rotation center of the optical disc.
And the first barcode 81 is provided in at least two sectors 76 among a plurality of sectors in the annular portion.
C, 76D, and are arranged between the two sectors 76C, 76D when viewed in the circumferential direction. Further, in the annular portion, the first barcode 81 and at least two sectors 76C are arranged. , 76D are additionally provided with an additional recording portion 84 for additionally recording the second barcode 83. When viewed in the signal reproducing direction of the optical disk indicated by the arrow in FIG.
It is a preferred embodiment that they are arranged immediately after one of 6C and 76D.

Various information can be recorded in the BCA of the embodiment of FIG. 2 or the two BCAs of the embodiment of FIG. 3 or FIG. That is, as bar codes, user designation information, rental information, region designation information, language designation information, use designation information, usable period designation information, usable count designation information, usable player designation information, resolution designation information, layer designation information One or more can be recorded. Further, these BCAs include barcodes of copyright holder information, copyright number information, date of manufacture, manufacturer information, date of sale, store information, seller information, product user information, use number information, 1 of used set number information
More than one can be recorded.

As shown in FIG. 2, only a recorded BCA, that is, a pre-mastered area is provided, and if there is no additional recording area, control in the optical disc reproducing apparatus is performed based on the information recorded at the time of manufacture. On the other hand, in the case of an optical recording medium having a write-once area in addition to a pre-mastered area, it can be used as follows. Now, suppose that the optical disk is a DVD and 100 computer game software are recorded in advance. Of these, only 10 software can be used unconditionally by the purchaser of this DVD, and the remaining 90 software can be used only after paying a predetermined fee.
In order to authorize use on condition that this fee is paid, DV
After purchasing the DVD, the D purchaser goes to a store such as a convenience store having a predetermined barcode writing device, pays a fee for software to be used, and then has the predetermined barcode recorded in the additional recording area. .

By recording the predetermined barcode in this additional recording area, the right to use the software for which the fee has been paid is given, and when the user plays the DVD on his / her DVD player, he / she enjoys the content before paying the fee. You will be able to enjoy software that you could not. That is,
The barcode recorded in the write-once area at the store where the fee is paid is read by the optical disk reproducing device, and the reproduction permission is given. In the above description, the use of the software is permitted simply by paying a fee. Additions and selections can be made.

Next, an optical disk reproducing apparatus of the present invention for reproducing the optical recording medium of the present invention will be described. FIG. 5 is a block diagram showing one embodiment of the optical disk reproducing apparatus according to the present invention. This optical disk reproducing apparatus reproduces information from a read-only type CD and DVD, and the DVD includes a read-only two-layer type, a write-once type, and a recording / reproducing type. FIG. 6 is a circuit diagram showing an optical pickup (PU) in FIG. 5 and an arithmetic unit (part of the preamplifier in FIG. 5) which responds to an output signal of the optical pickup (PU). 5 shows an example of a circuit for selecting one of the error signals.

In FIG. 5, a motor driver / tracking / focus control circuit 4 controls the disk 1 to be rotated at a CLV (constant linear velocity) during normal reproduction by a spindle (SP) motor 3. A signal read from the disk 1 by the optical pickup (optical head) 2 is supplied to a preamplifier 5, and an output signal thereof is supplied to a digital servo control circuit 6. The system controller 7 exchanges signals with the preamplifier unit 5 and the digital servo control circuit 6 to control the entire optical disc reproducing apparatus. The output signal of the digital servo control circuit (DSV) 6 is supplied to a motor driver / tracking / focus control circuit 4, and controls the rotation of the spindle motor 3, the tracking servo control of the optical pickup, and the focus servo control. The DSV 6 includes a variable speed controller / memory controller / EFM demodulation circuit / error correction circuit and the like in addition to the servo control circuit, and also has a function of transmitting a reproduction signal using a memory (not shown). The optical pickup 2 can be moved in the radial direction of the disk 1 by a traverse motor (not shown), and the objective lens is moved in the focus direction, that is, the direction along the optical path and the disk by a focus servo control mechanism and a tracking servo control mechanism (not shown). Can be moved in the radial direction.

The optical pickup 2 also has a laser diode for irradiating the disk 1 with a laser beam, and outputs a signal obtained by reproducing optical information recorded on the disk 1 based on the reflected light. As shown, signals AD for detecting a focus error signal FE by the astigmatism method and signals A to D for detecting a tracking error signal by the phase difference method, and two types of signals E and F for detecting a tracking error signal of a three-beam method. Is output. These signals are supplied to a preamplifier 5 where necessary calculations are performed.

FIG. 6 shows the four-divided photosensor portions A, B, C, and D.
FIG. 1 schematically shows an optical pickup 1 having optical sensors E and F used for a three-beam method, and an arithmetic unit which responds to output signals from those optical sensors.
Symbols A to F indicate both these optical sensor portions and their output signals. The adder 10 adds and outputs the output signals of the photosensor portions A and C on the diagonal line,
The adder 12 adds the output signals of the photosensor portions B and D on the other diagonal lines to each other and outputs the result. The adder 14 adds the output signals of the adders 10 and 12, and the subtractors 16 and 20 both subtract the output signal of the adder 12 from the output signal of the adder 10. Further, the subtracter 18 subtracts the output signal of the optical sensor portion F from the output signal of the optical sensor portion E. Adder 14
A falling pulse generating circuit 32 and a rising pulse generating circuit 34 are provided in response to the output signals of the above. Gate circuits 36 and 40 controlled by these output signals respectively gate the output signal of the subtracter 16 and hold the signals. Circuits 38 and 42 are provided. Hold circuit 38, 4
The output signals of 2 are supplied to the + and-input terminals of the subtractor 44, respectively, and the output signal of the subtractor 44 is supplied to one terminal of the switch 30. The output signal of the adder 14 is output as a sum signal (SA), an EFM signal or an EFM plus signal via the LPF 28 and the equalizer (EQ) 46, respectively. The output signal of the subtractor 18 is given to the 0 terminal of the switch 30. The output terminal of the switch 30 outputs the selected tracking error signal TE.

Control signal CON given to switch 30
T controls the switch 30 to select one of the two input signals, and is generated by the microcomputer of the system controller 7 as described later. The output signal of the subtracter 20 is given to a well-known focus servo control system to be used as a focus error signal FE. LPF28
Is a main signal for reading the recorded information of the disk and a signal to be measured for disc type discrimination described later. In addition, LPF28
Is used to remove high-frequency components that may be included in the sum signal SA. Focus error signal FE
Are used for well-known focus servo control.

The system controller 7 determines the type of disk by an operation of a microcomputer (not shown), which will be described later. The two types of tracking error signals are switched according to the result of the disc type discrimination according to the present invention, so that the three-beam method and the phase difference method can be selectively used for a CD having a low recording density and a disc having a high recording density. The microcomputer in the controller 7 generates a control signal CONT according to the type of the disk 1.
That is, if it is determined that the CD has a low recording density,
In order to select the tracking error signal of the three-beam method, the switch 30 in FIG. 6 is connected to the 0 side, and the output signal of the subtracter 18 is output. On the other hand, if it is determined that the disc has a high recording density, the switch 30 is connected to the 1 side to output the output signal of the LPF 28 in order to select a tracking error signal of the phase difference method.

Next, a bifocal type optical pickup 2, that is, an objective lens having two converging points as shown in JP-A-7-65407 and JP-A-7-98431, is provided with two converging points. A method for discriminating the type of a disc using a disc that can be used for different discs will be described. The optical pickup 2 has NA = 0.38 mm
And a spot of NA = 0.6 mm, two types of discs, ie, a CD having a plate thickness of t1 = 1.2 mm and t2 = 0.
It is assumed that information is read from a 6 mm DVD. The distance between the two focal points is 0.3 mm. If an image is formed simultaneously on the disk surface and the signal surface, the disk surface is affected by low-frequency modulation and offset, so that the distance between the two focal points cannot be set in the same manner as the disk thickness.

FIG. 7 is a diagram showing a state of focusing a laser beam on the disk 1 in such a bifocal optical pickup. 1-a is a disk with t1 = 1.2 mm, 1-b is t2 =
0.6-mm disc, 1-c indicates the focusing state on a dual-layer disc (interlayer distance t3 = 40 μm) with one layer being 0.6 mm, the leading upper beam is for 1.2 mm, and the trailing lower beam is The side beam is for 0.6 mm. In FIG. 7, α, β, γ, δ
Indicates the respective states in which the objective lens of the optical pickup 2 has moved in the focus direction. FIG. 8 shows various signal waveforms obtained from output signals when the focus search is performed by the optical pickup 2 corresponding to FIG. That is, the vertical axis in FIG. 4 is voltage, the horizontal axis is time, and p
Indicates a peak. The bifocal optical pickup is composed of a hologram lens.
Although signals are detected in addition to the two spots having two focal points as in Japanese Patent Publication No. 1, signals other than the two-focus detection signal are omitted here.

8-a to 8-d in FIG. 8 correspond to the disk 1-a in FIG. 7, 8-e to 8-h correspond to the disk 1-b in FIG.
8-l correspond to the disk 1-c in FIG. Also, the sum signal SA in FIG. 6 corresponds to the 8-a, 8-e, 8-i in FIG.
And the focus error signal FE is 8-b, 8-f,
8j, and the signal obtained as a result of comparing the sum signal SA with the threshold indicated by the dotted line is 8-c, 8-g, 8-k in FIG.
The signal obtained as a result of comparing the focus error signal FE with the threshold indicated by the dotted line is shown in FIG.
-d, 8-h, 8-l.

The focus search is performed by increasing or decreasing a voltage applied to a focus coil of the optical pickup 2 to move an objective lens which is a part of the optical system of the optical pickup 2 along an optical path. In the waveform 8-a in FIG. 8, the left peak in the figure is obtained in the state of α of the disk 1-a in FIG. 7, and the right peak is obtained in the state of β in the same manner. Thus, the peaks in FIG. 4 correspond to α and β in FIG.
The four peaks at -i to 8-l correspond to α, β, γ, and δ of the disk 1-c in FIG. In FIG. 8, the portion where the thin lines are dense shows the high frequency component HF.

The parameters such as the laser power of the optical head, the gain, offset, and balance of the circuit for generating the focus error signal and the tracking error signal in the preamplifier 5 are determined according to the disc type determined as described later. Switching of the characteristics of the equalizer 46 in the preamplifier 5 or the DSV 6, that is, necessary parameters are set in items such as a delay amount of a unit delay element of a transversal filter constituting the equalizer 46 and a tap gain setting.

The transversal filter constituting the equalizer 46 has a structure as shown in FIG. The delay time T and tap gains G0 to G4 of the unit delay element constituting the transversal filter can be controlled using data stored in advance in a program ROM of a controller (not shown) according to the type of the disk. As an example of T, for a 1.2 mm CD, T = 440 ns;
In the case of a 0.6 mm DVD, T = 80 ns can be switched. 1.2m as an example of G0-G4
For a CD of m, G2 = 1, G1 = G3 = 0.12, G0
= G4 = 0, and for a 0.6 mm DVD, G0 = 0.
02, G1 = 0.2, G2 = 1, G3 = 0.2, G4 =
0.02, and at the time of focus search, G2 = 1 to remove frequency characteristics, and the other values are set to 0.

FIG. 9 is a waveform diagram showing a focus search in a two-layer disc, in which servo control is turned on in the second layer of a 0.6 mm disc. FIG.
In the equation, 9-a is the focus coil applied voltage,
-b is the sum signal SA, 9-c is the focus error signal, 9-d
Is a signal obtained by comparing the sum signal SA with a threshold, 9-e is a signal obtained by comparing the focus error signal 9-C with a predetermined threshold, and 9-f is a reference value of the EFM signal by the comparator 50. Signal obtained by comparing with Ref, 9-g
Is HFDET (output signal of D-FF56) in FIG. The timing SC in the waveform 9-e indicates the time when the focus servo control is turned on.

FIG. 11 is a block diagram showing an example of a circuit for detecting a high frequency component HF using the sum signal SA and the EFM signal in the output signal of the circuit of FIG. The EFM signal is provided to the comparator 50, and is compared with the reference signal Ref. The sum signal SA is given to the D input of a D-FF (flip-flop) 52, its Q output is given to the D input of the next D-FF 54, and its Q output is the D input of the next D-FF 56. And its Q output is output as a detection signal HFDET. The output signal of the comparator 50 is output from each of the D-FFs 52 to
Provided as 56 clocks. Reset is D-
This is a reset signal for the FFs 52 to 56.

The output signal of the comparator 50 in the circuit of FIG.
That is, the signal after the comparison of the EFM signal is shown as 9-f in FIG. The D-FFs 52 to 56 count the pulses of the output signal of the comparator 50 only when the signal 9-d formed by shaping the waveform of the sum signal SA is H (high level).
In this example, when the count is 3, the output signal H of the D-FF 56 is obtained.
FDET 9-g becomes H. If three counts cannot be performed within this interval, the counter including the D-FFs 52 to 56 is reset by the sum signal SA or the like. In this example, three counts are used, but this count can be set to a predetermined number as appropriate.

The operation of the configuration combining FIG. 6 and FIG. 11 will be described. After turning on the power of the reproducing apparatus, the spindle (SP) motor 3 is started to start the focus search. That is, the voltage applied to the focus coil is increased little by little as shown in FIG.
A / D converted and taken into the microcomputer, the sum signal SA (9-b in FIG. 9) is read, and at the same time, the output signal HF in FIG.
Monitor DET (9-g in FIG. 9).

When sum signal SA exceeds a predetermined value and signal HF
DET becomes H, and the focus error signal (9-c in FIG. 9)
) Is compared with a predetermined value, and the signal 9-e is monitored. When the signal 9-e changes from H to L (low level), focus servo control is performed at the time t (corresponding to almost the zero cross point of the so-called S curve in the focus search). Is turned on. Also, various parameters of the reproducing apparatus due to the difference in the reflectance of each disc,
For example, laser power of an optical head, a focus error signal, a gain of a circuit for generating a tracking error signal,
An offset, a balance, a delay time of a unit delay element, a tap gain, and the like are set, and a reproduction process is executed.

The operation of the embodiment of the optical disk reproducing apparatus will be described with reference to the flowcharts shown in FIGS. When the power of the playback device is turned on,
This flow starts when a disc is replaced or when data reproduction of another layer is requested in a multi-layer disc, and firstly, predetermined contents of a memory and a buffer (not shown) connected to the microcomputer are cleared. In step S1, the spindle motor is started, and the optical pickup (P
U) to the innermost circumference of the disk. Thereafter, the optical pickup is moved slightly (predetermined amount) to the outer peripheral side. In the next step S3, the laser diode (LD) is turned on, a focus search is started, and the voltage of the actuator coil is increased. Next, in step S4, the voltage of the sum signal SA is changed to A.
The digital values obtained by the / D conversion are sequentially read and sequentially stored in a predetermined A / D conversion register.

In step S5, the voltage of the sum signal SA is compared with a predetermined value Q to determine whether the sum signal SA is larger than the predetermined value Q. If YES, it is determined in step S6 whether an edge of the sum signal SA has been detected. NO in step S6
If so, the process returns to step S4. In step S6, the sum signal SA
Is detected, the count C of the counter is incremented by one in step S7, and the process returns to step S4. On the other hand, if no edge of the sum signal SA is detected in step S6, the HF of the circuit of FIG.
It is determined whether or not DET is H. If the determination is NO, the process returns to step S4. If the determination is YES, it is determined in step S9 whether an edge of the focus error signal FE is detected. When the focus error signal FE changes from H to L
This is the time point of SC shown in the waveform 9-e in FIG.

When an edge of the focus error signal FE is detected, it is determined in step S10 whether or not the count C is 1, and if it is 1, it is determined that the loaded disk is a CD, and the disk is suitable for the CD. The parameters are set in step S11, and then the focus servo control is turned on in step S16. If C = 1 is not satisfied, it is determined in step S12 whether C = 2. If C = 2, it is determined that the disk is a single-layer DVD, and parameters suitable for that are set in step S13. Turns on the focus servo control. If not C = 2, it is determined whether or not C = 3 in step S14. If C = 3, it is determined that the disk is the first layer of a two-layer DVD, and parameters suitable for it are set in step S15. Then, in step S16, the focus servo control is turned on. The timing for turning on the focus servo control is shown in waveform 9-e in Fig. 9.
At the point of time SC shown in FIG. The disc type can be determined based on the number of counts C, as shown in FIG. 8, because the relationship between the number of peaks of the sum signal SA obtained during the focus search and the timing at which the high frequency component in the EFM signal is detected. This is due to a certain relationship depending on the type of disc.

In each of the above configurations, by preparing a plurality of thresholds of a comparator for binarizing the sum signal SA, a write-once type or a recording / reproducing type in which the level of the sum signal SA differs due to a difference in reflectance. Can be detected. The above description of operation is based on a read-only CD and a single-layer DVD.
It is a case when applied to.

After step S16, the tracking servo control is turned on in step S17, and then in step S1.
In step 8, the tracking balance is adjusted. Next, in step S19, the sector address is read, and in step S20, the light spot of the optical pickup is moved to the lead-in area. In step S21, the lead-in data and B
It is determined whether the CA data has been reproduced. If there is no such data, the process goes to step S25 to start the reproducing operation.

On the other hand, if step S21 is YES, the light spot is changed to BC while reading the address in step S22.
Move to A. At this time, as described with reference to FIG.
The CA barcode is provided over a plurality of tracks, but the barcode is read in the circumferential direction along the radially inner or outer end of each black bar extending in the radial direction of the disk. Attempting to read the bar code data may not be possible due to the eccentricity of the disk. Therefore, the barcode is read out along a track near the center in the radial direction of the plurality of tracks. In step S22, the light spot is read from a portion 75 of the sector 76 at least one in one circumference shown in FIG. 2 so as to read the bar code along a track near the center of the plurality of tracks on which the bar code is recorded. Read address and jump to track near center (kick)
And then perform tracking servo control.

Next, the address is read in step S23, and the BCA bar code (BC
(Referred to as A code or BCA signal) and read at least one round of a track on the disk. Here, if there is an additionally written barcode, the additionally written barcode is read together with a certain barcode from the beginning of manufacture. This is because the current state of the disc can be accurately determined by reading all the contents of both the bar code from the beginning and the added bar code.

In the next step S24, the reproduction data reproduced from the BCA code is determined. That is, user-designated information, rental information, area-designated information, language-designated information, use-designated information, usable-period-designated information, usable-times-designated information, available-player-designated information, resolution-designated information, If there is designated information, copyright holder information, copyright number information, manufacturing date information, manufacturer information, sales date information, dealer information, seller information, product user information, use number information, use set number information, etc. , And decodes them and sends them to the microcomputer of the system controller 7.
The microcomputer determines a reproduction mode such as permission of selective reproduction in a plurality of programs based on the information read from the BCA, and in step S25, based on an instruction from the user within an allowable range. The reproducing operation is started to execute the reproducing operation. The reading of the BCA code is performed for both the pre-mastered area and the additional recording area, and when there is a conflict between the two information, the information of the additional recording area recorded later in time is prioritized.

In the above embodiment, it is determined whether the sum signal SA is larger than the predetermined value Q, and then the HFDE of the circuit shown in FIG.
It is determined whether or not T is H, and then it is determined whether or not the edge of the focus error signal FE has been detected, and the focus servo control is turned on. When the focus search is started, that is, after the applied voltage of the focus coil starts to increase, HFDET of the circuit of FIG. 11 is monitored, HFDET becomes H, and then the edge of the focus error signal FE is detected. Alternatively, the focus servo control may be turned on at the point of time SC shown by the waveform 9-e in FIG.

FIG. 12 shows an output signal of the circuit of FIG.
FIG. 11 is a block diagram illustrating another example of a circuit that detects a high-frequency component HF using a signal. The EFM signal is provided to the comparator 60 via the HPF 58, and is compared with the reference signal Ref. The output of the comparator 60 is provided as a clock for the D-FF 62, and its Q output is output as a detection signal HFDET. A predetermined value is always given to the D input of the D-FF 62. Reset is a reset signal for the D-FF 62. The circuit shown in FIG. 12 extracts a high frequency component HF of the EFM signal, and latches a signal obtained by comparing the extracted high frequency component HF with a reference signal Ref. It should be noted that other configurations than those shown in FIGS. 11 and 12 may be used as long as they detect high-frequency components. For example, an HPF may be provided at the input section of the counter section shown in FIG. Can also.

The operation in the case where the circuit of FIG. 12 is used in place of the circuit of FIG. 11 and the circuit of FIG. 6 is described.
When the focus search is started, that is, after the applied voltage of the focus coil starts to increase, the binary signal 9-d of FIG. 9 obtained by comparing the sum signal SA with a predetermined value is monitored. And the HFD of the circuit of FIG.
ET is monitored, HFDET becomes H, and then the edge of the focus error signal FE is detected in FIG.
The focus servo control is turned on at the time of SC shown in 9-e.

[0049]

As described above, according to the present invention, in addition to main information recorded as optical information on an optical recording medium, a bar code provided for recording auxiliary information on an inner peripheral portion of an optical disk is used. An optical recording medium and an optical disk reproducing apparatus having an additional function such as protection of copyright using a so-called BCA (burst cutting area) known as a recording portion and permission of selective reproduction of recorded information are provided. Rights can be effectively protected, so that recording on optical recording media such as computer software and high-value movie software can be promoted.

[Brief description of the drawings]

FIG. 1 is a schematic plan view of an optical recording medium according to the present invention.

FIG. 2 is a schematic diagram showing a configuration of a BCA of an optical recording medium according to the present invention.

FIG. 3 is a schematic diagram showing another configuration of the BCA of the optical recording medium according to the present invention.

FIG. 4 is a schematic diagram showing still another configuration of the BCA of the optical recording medium according to the present invention.

FIG. 5 is a waveform diagram showing a focus search in a two-layer disc.

FIG. 6 is a block diagram showing one embodiment of the optical disk reproducing apparatus of the present invention.

FIG. 7 is a diagram showing a state in which a laser beam is focused on various types of discs in a bifocal optical pickup.

8 is a waveform diagram showing output signals of an optical pickup obtained when a focus search is performed on the various disks shown in FIG. 7 and various signals obtained therefrom.

FIG. 9 is a waveform diagram showing a timing when a disc type is determined by a focus search and the focus servo control is turned on using the result of the determination.

10 is a block diagram illustrating a configuration of a transversal filter included in the preamplifier or the DSV of FIG. 5,
7 is a block diagram illustrating a configuration of a transversal filter as a circuit example of the equalizer in FIG. 6.

11 shows sum signals SA and EF among output signals of the circuit of FIG. 6;
FIG. 3 is a block diagram illustrating an example of a circuit that detects a high-frequency component HF using an M signal.

12 is a block diagram illustrating an example of a circuit that detects a high-frequency component HF using an EFM signal in an output signal of the circuit of FIG. 6;

13 is a first half of a flowchart showing an operation of a microcomputer (microcomputer) used in the system controller in FIG. 5;

FIG. 14 is a second half of a flowchart showing the operation of the microcomputer (microcomputer) used in the system controller in FIG. 5;

[Explanation of symbols]

Reference Signs List 1 optical disk 1R optical recording portion 1S innermost peripheral portion 2 optical pickup (optical head) 3 spindle motor 4 motor driver / tracking / focus control circuit (servo control means together with DSV6) 5 preamplifier (means for obtaining a reproduction signal together with DSV6) 6) Digital servo (DSV) control circuit (constitutes servo-on means with the system controller) 7 System controller (constitutes address detection means, discrimination means, BCA signal reading means, control means with other circuits) 8A, 8B, 8C, 8D, 8E Innermost track 9 BCA 10, 12, 14, 22 Adder 16, 18, 20, 44 Subtractor 24 Delay circuit 26 Multiplier 28 LPF (low-pass filter) 30 Switch 32, 34 Pulse generation circuit 36, 40 Gate circuit 38, 42 Hold circuit 46 Equalizer 50, 60 Comparator 52, 54, 56, 62 D-FF 58 HPF (High-pass filter) 72-1, 72-2, 72-3 Black bar 74-1, 74- 2, 74-3 White bar 75 Additional portion 76, 76A, 76B Sector 78 First annular portion 80 Second annular portion (additional portion) A, B, C, D Quadrant optical sensor portion E, F used for phase difference method Two sensor parts used for three beam method

Continuation of the front page (51) Int.Cl. ⁷ identification code FI G11B 7/24 571 G11B 7/24 571A 23/30 23/30 Z (58) Investigated field (Int.Cl. ⁷ , DB name) G11B 7 / 00-7/013 G11B 7/24 G11B 23/30 G11B 7/09-7/095 G06K 7/00

Claims (7)

(57) [Claims] 1. An optical recording medium in which main information is optically recorded along a concentric or spiral track, wherein auxiliary information is divided into a plurality of sectors near the innermost circumference of the concentric or spiral track. When the barcode is recorded as a barcode superimposed on an optical recording portion, the barcode is viewed from the rotation center of the optical recording medium.
At least one of the plurality of sectors arranged in the first annular portion over 60 degrees and in the first annular portion;
A second annular portion arranged in a portion excluding one sector and further having at least one sector for additionally writing a barcode inside or outside in the radial direction of the first annular portion. Optical recording medium. 2. The bar code according to claim 1, wherein the bar codes are arranged immediately after the at least one sector of the first annular portion when viewed in a signal reproducing direction of the optical recording medium. Optical recording medium. 3. A tiger whose main information is concentric or spiral.
Optical recording medium optically recorded along the
Report is near the innermost circumference of the concentric or spiral track
Over the optical recording area divided into multiple sectors
The bar code is recorded on the optical recording medium when viewed from the center of rotation of the optical recording medium.
Being arranged in an annular part extending over 60 degrees and said annular part
At least one of the sectors in the
The bar codes include user-specified information, rental information, area-specified information, language-specified information, use-specified information, usable period-specified information, usable count-specified information, and usable players. designation information, resolution designation information, the optical recording medium that have been recorded with one or more of the layer specifying information. 4. A tiger whose main information is concentric or spiral.
Optical recording medium optically recorded along the
Report is near the innermost circumference of the concentric or spiral track
Over the optical recording area divided into multiple sectors
The bar code is recorded on the optical recording medium when viewed from the center of rotation of the optical recording medium.
It is arranged in the annular part minute over 60 degrees, and the annular portion
At least one of the sectors in the
The bar code includes copyright owner information, copyright number information, manufacturing date information, manufacturer information, sales date information, dealer information, seller information, and product user information. , use number information, the one or more optical recording medium that have been recorded among the uses set number information. 5. An optical disk in which main information is optically recorded along a concentric or spiral track, and the first auxiliary information is divided into a plurality of sectors of a plurality of tracks near the innermost circumference of the concentric or spiral track. The first barcode is recorded at the time of manufacture as a first barcode over a recording portion, and the first barcode is arranged in an annular portion extending 360 degrees from the center of rotation of the optical recording medium, and The second auxiliary information is arranged in a portion excluding at least one sector among the plurality of sectors, and the second auxiliary information is the same track as the plurality of tracks near the innermost circumference of the concentric circle or spiral track or a plurality of different tracks. The second barcode is additionally recorded as a second barcode over the optical recording portion divided into a plurality of sectors after manufacturing, and the second barcode is the optical recording medium. Optical recording arranged in the same or different part as the annular portion extending 360 degrees from the rotation center of the optical recording medium and arranged in a portion excluding at least one sector among the plurality of sectors in the annular portion. An optical disc reproducing method for irradiating a light beam from the medium to the optical recording medium and detecting the reflected light or the transmitted light thereof, comprising: reading an address from the sector; and using the address to read the first auxiliary information. Reading both of the first auxiliary information and the second auxiliary information; determining the current state of the optical disk using both the first auxiliary information and the second auxiliary information; Selectively executing the reproduction of the optical disk. 6. The bar code information includes a use restriction,
At least one of the number of uses and language information is the content of the recorded information
When that has been recorded in advance in accordance with, before Symbol barcode
And reproduces the barcode information based on the reproduced barcode information.
And one or more restrictions on the mode of reproduction of the main information
Or selectively executing the main information.
The optical disk reproducing method according to the above. 7. A tiger whose main information is concentric or spiral.
Optically recorded along the loop, and the first auxiliary information is
Indicates multiple tracks near the innermost circumference of the spiral track
Overlaid on the optical recording portion divided into a plurality of sectors
Recorded at the time of manufacture as a barcode, and
-The code is 360 degrees from the center of rotation of the optical recording medium
Are arranged in an annular portion that spans
Excluding at least one sector from the plurality of sectors
And the second auxiliary information is the concentric circle or the circle.
The plurality of tracks near the innermost circumference of the spiral track
Multiple tracks on the same track or different tracks
A second barcode over the optical recording portion divided into
And after the manufacture, and the second bar code
Is 360 degrees from the center of rotation of the optical recording medium.
Are arranged in the same or different part as said cyclic part,
At least one of the plurality of sectors in the annular portion.
Also, the optical recording medium arranged in a portion excluding one sector
The body irradiates the optical recording medium with a light beam,
An optical disk reproducing method for detecting emitted light or transmitted light.
Te, a step of reading the address from said sector, said second auxiliary and said first auxiliary information using the address
Reading both of the information, comparing the first auxiliary information with the second auxiliary information,
If they conflict with each other, the second bar code added
Of the optical disc by using the second auxiliary information
Judging the current state, and selecting the reproduction of the main information according to the current state of the optical disc.
Selectively performing the steps .