JPH11167719A - Optical recording medium and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical recording medium having a structure being hardly modified. SOLUTION: The optical recording medium 1 is composed, in the radial direction, of a first area 2 composed of a read-in 21, a data area 22, a read-out 23, a transition area 3 and a second area 4 composed of a read-in 41, a data area 42, a read-out 43 and the related information relating the first area 2 to the second area 4 is recorded in the read-in 21 of the first area 2 and the read-in 41 of the second area 4.

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 having a plurality of areas, in particular, an area recorded at a recording density of a CD format and a recording density substantially twice as high as the recording density of a CD format. The present invention relates to an optical recording medium having a recorded area and related information recorded in each area.

[0002]

2. Description of the Related Art An optical disk having a thickness of about 1.2 mm, such as a CD-ROM, from which information is read using a semiconductor laser is provided. In this type of optical disk, focus servo and tracking servo are performed on a pickup objective lens to irradiate a pit row on a signal recording surface with a laser beam to reproduce a signal. Recently, the recording density for recording a long moving image has been increasing.

[0003] For example, the same 12 cm diameter as a CD-ROM
DVDs that record 4.7 Gbytes of information on one side of an optical disc are sold. The thickness of a DVD disk is about 0.6 mm, and by bonding both sides to each other, information of 9.4 Gbytes can be recorded by one sheet. Also, next-generation DVDs having a higher recording density than the DVD format are being developed. Further, there is also a double-density CD having the same diameter and the same substrate thickness as the CD, and having a recording density twice that of the CD.

[0004] Among these various types of optical disks, CDs
Double density CD having twice the recording density of
Since the diameter and the substrate thickness are the same as those of the CD, the disk attracts attention as a disk that satisfies both the requirement of high density and the requirement of the player side, and is particularly used as a karaoke disk. In recent years, the development of discs for game machines has been progressing.

[0005]

In a double-density CD for a game machine, specific information is recorded in a lead-out, and the game software cannot be reproduced unless the specific information is detected. However, I purchased a regular double-density CD, left the lead-out that recorded this specific information as it was, and recorded my own software on the inner side from that,
Modified optical disks are now available.

Therefore, the present invention solves such a problem,
An object of the present invention is to provide an optical recording medium having a structure that cannot be easily modified.

[0007]

Means for Solving the Problems and Effects of the Invention The invention according to claim 1 is an optical recording medium having a plurality of areas in which related information is recorded. According to the invention described in claim 1, since the related information is recorded in a plurality of areas, even if the optical recording medium is modified while leaving only one area, the related information is recorded in other areas. It is easily understood that the optical recording medium has been modified since it has not been modified.

According to a second aspect of the present invention, there is provided the optical recording medium according to the first aspect, wherein a plurality of regions exist in a radial direction of the optical recording medium. According to the second aspect of the present invention, since the plurality of regions exist in the radial direction of the optical recording medium, it is easy to manufacture the optical recording medium having the plurality of regions. The invention according to claim 3 is:
The optical recording medium according to claim 1, wherein the plurality of regions are present in a direction in which the laser beam travels.

According to the third aspect of the present invention, since a plurality of regions are present in the traveling direction of the laser beam, it is possible to provide an optical recording medium which is difficult to be modified even in a high-density optical recording medium. According to a fourth aspect of the present invention, in the configuration of the optical recording medium according to the second or third aspect,
The optical recording medium has a plurality of regions including a first region and a second region.

According to the fourth aspect of the present invention, it is possible to provide an optical recording medium having two areas which is hardly modified. According to a fifth aspect of the present invention, there is provided the optical recording medium according to the fourth aspect, wherein the related information is information for associating the first area with the second area.

[0011] According to the invention described in claim 5, the first aspect is as follows.
Since information for associating the area with the second area is recorded, even if the optical recording medium is modified while leaving only one of the areas, the related information is not recorded in the other area. It can be easily understood that the optical recording medium is an optical recording medium. According to a sixth aspect of the present invention, in the optical recording medium according to the fifth aspect, the related information is recorded in the lead-in of the first area and the lead-in of the second area. Medium.

According to a seventh aspect of the present invention, in the configuration of the optical recording medium according to the fifth aspect, the related information is the first information.
Is an optical recording medium recorded in a lead-in area and a lead-out area. According to an eighth aspect of the present invention, in the optical recording medium according to the fifth aspect, the related information is recorded in a lead-out area of the first area and a lead-in area of the second area. Medium.

According to a ninth aspect of the present invention, in the configuration of the optical recording medium according to the fifth aspect, the related information is the first information.
Is an optical recording medium recorded in the lead-out of the area No. and the lead-out of the second area. According to the invention as set forth in claims 6 to 9, the related information is recorded in one of the lead-in and lead-out of the first area and one of the lead-in and lead-out of the second area. Therefore, it is possible to provide an optical recording medium that is not easily modified without reducing the signal amount recorded in each area.

According to a tenth aspect of the present invention, there is provided the sixth aspect of the present invention.
10. The optical recording medium according to claim 1, wherein the first area is recorded at a first recording density, and the second area is higher in density than the first recording density. An optical recording medium recorded at a recording density. According to the tenth aspect of the present invention, even if the optical disk is mounted on a reproducing apparatus for an optical recording medium recorded at the first recording density or an optical recording medium recorded at the second recording density, the reproduction is performed. It is possible to provide an optical recording medium which is not easily modified.

The invention according to claim 11 is the first invention.
0, wherein the first recording density is a recording density according to the CD format and the second recording density is substantially twice as high as the recording density according to the CD format. It is. According to the eleventh aspect of the present invention, it is possible to provide an optical recording medium that can be reproduced and hardly remodeled even when the optical recording medium is mounted on a reproducing apparatus for a CD or a double-density CD.

The invention according to claim 12 is the invention according to claim 6.
The optical recording medium according to any one of claims 1 to 9, wherein the first area and the second area are recorded at one recording density. According to the twelfth aspect of the present invention, since the first area and the second area are recorded at one recording density, an optical recording medium that is difficult to remodel can be easily manufactured.

The invention according to claim 13 is the first invention.
2 is an optical recording medium in which one recording density is a recording density in a CD format. According to the invention described in claim 13, the first
The second area and the second area are recorded at a recording density according to the CD format, so that it is possible to provide a CD that is difficult to remodel.

The invention according to claim 14 is the first invention.
2. In the configuration of the optical recording medium described in No. 2, one recording density is substantially 2
An optical recording medium that is twice as dense. According to the fourteenth aspect, the first area and the second area are recorded at a recording density that is substantially twice as high as the recording density according to the CD format, so that the first area and the second area are difficult to be modified. Dense C
D can be provided.

The invention according to claim 15 is the invention according to claim 4.
15. A reproducing apparatus for reproducing an optical recording medium according to any one of claims 1 to 14, wherein the optical pickup apparatus irradiates the optical recording medium with a laser beam and detects light reflected from the optical recording medium; And a control circuit that controls the optical pickup device to perform a normal reproduction operation after reproducing the first area and the second area of the medium and detecting related information.

According to the fifteenth aspect of the present invention, the reproducing apparatus performs a normal reproducing operation only after detecting the related information recorded in the first area and the second area of the optical recording medium. Therefore, it is easy to determine whether the loaded optical recording medium is a proper optical recording medium.

[0021]

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of an optical recording medium according to the present invention and a radial layout of each region. Optical recording medium 1
Comprises a first area 2, a transition area 3, and a second area 4. The first area 2 includes a lead-in 21, a data area 2
2, and a lead-out 23, the second region 4
It has a lead-in 41, a data area 42, and a lead-out 43. That is, the optical recording medium 1
, The data area 22 of the first area 2, the lead-out 23 of the first area 2, the transition area 3,
The lead-in 41 of the second area 4, the data area 22 of the second area 4, and the lead-out 23 of the second area 4 are arranged in this order. A transition region 3 is formed between the first region 2 and the second region 4, but the transition region 3 is not always necessary.

In the optical recording medium 1, related information is recorded in the lead-in 21 of the first area 2 and the lead-in 41 of the second area 4. The related information is information for linking the first area 2 and the second area 4, and includes the lead-in 21 of the first area 2 and the lead-in 41 of the second area 4.
For the first time, the loaded optical recording medium is a legitimate optical recording medium. Therefore, the first
Even if the related information is reproduced from only one of the lead-in 21 of the area 2 and the lead-in 41 of the second area 4, the mounted optical recording medium is not recognized as a proper optical recording medium. According to the optical recording medium 1 having such a configuration, for example, the other area is modified while leaving only the lead-in 21 of the first area 2 so that the first area 2 and the second area 4 are formally formed. Even if an existing optical recording medium is produced, the related information is not recorded in the second area 4, so that the optical recording medium is not recognized as a legitimate optical recording medium, and remodeling can be prevented. As a method of recording the related information, a method of recording the same specific information in the lead-in 21 of the first area 2 and the lead-in 41 of the second area 4 and a method of recording the same information in the lead-in 21 of the first area 2. There is a method in which a part of specific information is recorded in the lead-in 41 of the second area 4 and the information recorded in the two lead-ins 21 and 41 is reproduced to become meaningful information only after reproduction.

FIG. 2 is a diagram showing a data structure of the lead-in of the CD. In the present invention, the related information is recorded in the R channel 6 that is not normally used among the subcodes 5. The R channel 6 has 96 bits (= 12 bytes), and information specific to this area, for example, “53”
41 4E 594 F 20 53 41 4E 5
Record 9 4F 20 ". Therefore, this specific information is recorded in the R channel of the lead-in 21 in the first area 2 and the R channel of the lead-in 41 in the second area 4. Normally, by recording the specific information on the unused R channel, the specific information can be recorded without reducing the recording density of the optical recording medium 1.

In the above description, the specific information is recorded in the lead-in 21 of the first area 2 and the lead-in 41 of the second area 4. However, the present invention is not limited to this. In 21 and lead-out 43 of the second area 4
The specific information may be recorded in the lead-out 23 of the first area 2 and the lead-in 41 of the second area 4.
Specific information may be recorded in the readout 43 of the second area 4. Also, the specific information may be recorded in the data area 22 of the first area 2 and the data area 42 of the second area 4.

The first area 2 and the second area 4 of the optical recording medium 1 may exist in the direction in which the laser beam travels. That is, referring to FIG. 3, in the optical recording medium 10, the first
Region 2 is located at a distance L1 from the laser beam incident surface 30, and the second region 4 is located at a distance L2 from the laser beam incident surface 30. The first area 2 and the second area 4 have a lead-in 2
1, 41, data areas 22, 42, lead-out 23,
43 are provided. The optical recording medium 10 is a so-called multilayer disc in which a plurality of signal recording surfaces exist in the traveling direction of the laser beam. As shown in FIG. 3, the first area 2 and the second area 4 The first region 2 and the second region 4 are not limited to those that are largely apart from each other such as the distances L1 and L2, and are located at a certain distance from the laser beam incident surface 30. The optical recording medium may have a structure in which the distance from the second region 4 is about 10 μm.

The first area 2 and the second area 2 of the optical recording media 1 and 10
The recording density of the area 4 will be described with reference to FIG. FIG. 4 shows the standard values and reproduction conditions of a CD and the standard values and reproduction conditions of a double-density CD which is substantially twice as high as the recording density in the CD format. CD substrate thickness is 1.2 (tolerance ± 0.1) mm, shortest pit length is 0.90 (tolerance ± 0.1) μm, track pitch is 1.6 (tolerance ± 0.1) μm The reflectivity of the laser beam having a wavelength of 780 nm is 60 to 70% or more, and the spot diameter of the laser beam during reproduction is 1.5 (allowable error ±
0.1) μm, the numerical aperture of the objective lens is 0.45 (allowable error ± 0.05), and the reproduction laser beam wavelength is 780 (allowable error ± 15) nm. Further, the substrate thickness of a double-density CD is 1.2 (allowable error ± 0.1) mm, and the shortest pit length is 0.6.
4 (allowable range 0.58 to 0.69) μm, track pitch 1.14 (allowable error ± 0.09) μm, wavelength 780 n
m is greater than or equal to 60 to 70% (in the case of a single signal recording surface) or 18 to 40% (in the case of two signal recording surfaces), and the laser beam has a spot diameter of 1 during reproduction. 0.3 (tolerance ± 0.1) μm, the numerical aperture of the objective lens is 0.50 (tolerance ± 0.05), and the reproduction laser beam wavelength is 780 (tolerance ± 15) nm. In the present invention, the first area 2 and the second area 4 may be recorded at a recording density in a CD format,
Further, the first area 2 and the second area 4 may be recorded at a recording density according to a double-density CD format which is substantially twice as high as the recording density according to the CD format. Area 2 may be recorded at a recording density according to the CD format, and the second area 4 may be recorded at a recording density according to the double-density CD format. Still further, the first region 2
Is the recording density in the double-density CD format,
May be recorded at the recording density in the CD format. In an optical recording medium in which the first area 2 is recorded at a recording density according to the CD format and the second area 4 is recorded at a recording density according to the double-density CD format, the "mounted" The optical recording medium is a CD having a double density. ", So that the optical recording medium can be reproduced even when it is mounted on a reproducing apparatus dedicated to the CD, and is hardly modified. Media can be provided.

The recording density of the first area 2 and the second area 4 is the recording density by the CD format and the double density CD.
The recording density is not limited to the recording density according to the format.
It may be a recording density according to a format, a recording density according to a CD format, a recording density according to a double-density CD format, a recording density according to a DVD format,
Two recording densities arbitrarily selected from recording densities according to the high-density DVD format may be used.

In the above description, an optical recording medium having a first area and a second area has been described. However, the number of areas need not be limited to two, and is generally divided into a plurality of areas. Just do it. That is, referring to FIG.
Are the first region 51 and the second region 5 in the radial direction from the inner peripheral side.
, N-th region 5n, and each region 51, 5
2,..., 5n are a lead-in, a data area,
Have a lead-out. In the optical recording medium 50 having a plurality of areas, the specific information only needs to be recorded in at least two areas. Further, the recording location may be any of the lead-in, data area, and lead-out locations of each area. Further, the recording method of the specific information is the same as the method described above.

The optical recording medium having a plurality of areas 51, 52,..., 5n is not limited to the one shown in FIG.
Optical recording media 60 and 70 shown in FIG. In the optical recording medium 60, there are a first region 51, a second region 52,..., An n-th region 5n from the laser beam incident surface 61 side, and the respective regions 51, 52,. 5n is provided on the entire surface of the optical recording medium 60. In addition, each area 5
Each of 1, 52,..., 5n has a lead-in, a data area, and a lead-out. Further, each area 51, 5
The recording densities of 2,..., 5n are the recording density of the CD format, the recording density of the double-density CD format, the recording density of the DVD format,
One recording density arbitrarily selected from the recording densities according to the formats may be used. The recording density according to the CD format, the recording density according to the double-density CD format, the recording density according to the DVD format, and the high density DV
Two or more recording densities arbitrarily selected from recording densities in the D format may be used.

In the optical recording medium 70, the first area 51, the second area 52,..., The n-th area 5n
Are present at different positions from the laser beam incident surface 71 and are divided in the radial direction of the optical recording medium. Also in the optical recording medium 70, each area 51, 52,.
.., 5n each have a lead-in, a data area, and a lead-out, and the recording densities are a recording density by a CD format, a recording density by a double-density CD format, a recording density by a DVD format, and a high-density DVD.
One recording density arbitrarily selected from the recording densities according to the formats may be used. The recording density according to the CD format, the recording density according to the double-density CD format, the recording density according to the DVD format, and the high density DV
Two or more recording densities arbitrarily selected from recording densities in the D format may be used.

With reference to FIG. 8, a reproducing apparatus for the optical recording medium 1 and its reproducing operation will be described. Playback device 8
Reference numeral 0 includes an optical pickup 81, a reproduction signal amplification circuit 82, a control circuit 83, a servo circuit 84, a servo mechanism 85, and a spindle motor 86. The optical pickup 81 irradiates the optical recording medium 1 with a laser beam, detects reflected light from the optical recording medium 1, and a reproduction signal amplifying circuit 82 generates a reproduction signal based on the reflected light detected by the optical pickup 81.
Signals such as a tracking error signal and a erroneous error signal are detected, and the signals are amplified. A reproduction signal is sent to the control circuit 83 and an error signal is sent to the servo circuit 84. The servo circuit 84 controls the servo mechanism 85 based on an error signal and the like sent from the reproduction signal amplification circuit 82, and the servo mechanism 85 controls the spindle motor 86 based on the error signal and the like from the servo circuit 84 at a predetermined rotation speed. To perform focus servo and tracking servo of the objective lens in the optical pickup 81.

When the optical recording medium 1 is mounted on the reproducing apparatus 80, the spindle motor 86 rotates the optical recording medium 1 at a predetermined number of revolutions, and the optical pickup 81 moves to the first area 2 of the optical recording medium 1. The lead-in 21 is irradiated with a laser beam to detect the related information described above. Optical pickup 8
The related information detected by 1 is sent to the reproduction signal amplification circuit 82, amplified to a predetermined value, and then sent to the control circuit 83. After recognizing that the related information has been sent from the reproduction signal amplifying circuit 82, the control circuit 83
In order to move 1 to the lead-in 41 of the second area 4,
A command is issued to the servo circuit 84. The servo circuit 84 controls the servo mechanism 85 based on a command from the control circuit 83, and moves the optical pickup 81 to the lead-in 41 in the second area 4. Thereafter, the optical pickup 81 detects relevant information from the lead-in 41,
The related information detected in the same manner as described above is sent to the control circuit 83 via the reproduction signal amplification circuit 82. After receiving the relevant information reproduced from the lead-in 41 of the second area 4, the control circuit 83 reads the lead-in 2 of the first area 2.
1 and the related information reproduced from the lead-in 41 of the second area 4 are determined to be coincident with each other. Optical recording medium, and subsequently the optical pickup 81
Is moved to the data area 22 of the first area 2 or the data area 42 of the second area 4, and a normal reproduction operation is performed.

The reproducing device 80 is not limited to the optical recording medium 1,
When the optical recording media 10, 50, 60, and 70 are mounted, the same operation as that described with reference to FIG. 8 is performed. Playback device 80
Thus, whether the loaded optical recording medium is a proper optical recording medium can be easily identified.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical recording medium according to the present invention and a radial layout of each region.

FIG. 2 is a diagram illustrating an area for recording a lead-in data configuration and related information.

FIG. 3 is a sectional view of another optical recording medium according to the present invention.

FIG. 4 is a table showing standard values and reproduction conditions of a CD and a double density CD. .

FIG. 5 is a plan view of another optical recording medium according to the present invention.

FIG. 6 is a sectional view of another optical recording medium according to the present invention.

FIG. 7 is a sectional view of still another optical recording medium according to the present invention.

FIG. 8 is a block diagram of a reproducing apparatus for reproducing an optical recording medium according to the present invention.

[Explanation of symbols]

 1, 10, 50, 60, 70 ... optical recording medium 2 ... first area 3 ... transition area 4 ... second area 21, 41 ... lead-in 22, 42 ... Data area 23, 43 Readout 5 Subcode 6 R channel 30, 61, 71 Input surface 80 Reproduction device 81 Optical pickup 82 Reproduction Signal amplification circuit 83 ・ ・ ・ Control circuit 84 ・ ・ ・ Servo circuit 85 ・ ・ ・ Servo mechanism 86 ・ ・ ・ Spindle motor

Claims (15)

[Claims] 1. An optical recording medium having a plurality of areas in which related information is recorded. 2. The optical recording medium according to claim 1, wherein the plurality of regions exist in a radial direction of the optical recording medium. 3. The optical recording medium according to claim 1, wherein the plurality of regions exist in a direction in which a laser beam travels. 4. The optical recording medium according to claim 2, wherein the plurality of areas include a first area and a second area. 5. The optical recording medium according to claim 4, wherein the related information is information for associating the first area with the second area. 6. The optical recording medium according to claim 5, wherein the related information is recorded in a lead-in of the first area and a lead-in of the second area. 7. The optical recording medium according to claim 5, wherein the related information is recorded in a lead-in area of the first area and a lead-out area of the second area. 8. The optical recording medium according to claim 5, wherein the related information is recorded in a lead-out of the first area and a lead-in of the second area. 9. The optical recording medium according to claim 5, wherein the related information is recorded in a lead-out of the first area and a lead-out of the second area. 10. The recording medium according to claim 1, wherein the first area is recorded at a first recording density, and the second area is recorded at a second recording density higher than the first recording density. Item 6
The optical recording medium according to claim 1. 11. The light according to claim 10, wherein the first recording density is a recording density according to a CD format, and the second recording density is substantially twice as high as the recording density according to a CD format. recoding media. 12. The optical recording medium according to claim 6, wherein the first area and the second area are recorded at one recording density. 13. The optical recording medium according to claim 12, wherein the one recording density is a recording density in a CD format. 14. The optical recording medium according to claim 12, wherein the one recording density is substantially twice as high as the recording density in the CD format. 15. A reproducing apparatus for reproducing an optical recording medium according to claim 4, wherein the optical recording medium is irradiated with a laser beam, and reflected light from the optical recording medium is reflected from the optical recording medium. And a control for reproducing the first area and the second area of the optical recording medium and controlling the optical pickup apparatus to perform a normal reproducing operation after detecting the related information. A playback device including a circuit.