KR20090085449A - Optical disc - Google Patents
Optical disc Download PDFInfo
- Publication number
- KR20090085449A KR20090085449A KR1020080011352A KR20080011352A KR20090085449A KR 20090085449 A KR20090085449 A KR 20090085449A KR 1020080011352 A KR1020080011352 A KR 1020080011352A KR 20080011352 A KR20080011352 A KR 20080011352A KR 20090085449 A KR20090085449 A KR 20090085449A
- Authority
- KR
- South Korea
- Prior art keywords
- layer
- thickness
- substrate
- burst cutting
- cover layer
- Prior art date
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Images
Classifications
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
- G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
- G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
- G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
- G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
- G11B20/0026—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored as a barcode
- G11B20/00268—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored as a barcode said barcode being recorded in a burst cutting area [BCA]
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/007—Arrangement of the information on the record carrier, e.g. form of tracks, actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
- G11B7/00736—Auxiliary data, e.g. lead-in, lead-out, Power Calibration Area [PCA], Burst Cutting Area [BCA], control information
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/2403—Layers; Shape, structure or physical properties thereof
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- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/24094—Indication parts or information parts for identification
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
- G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
- G11B7/241—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material
- G11B7/252—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of layers other than recording layers
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B2220/00—Record carriers by type
- G11B2220/20—Disc-shaped record carriers
- G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
- G11B2220/2537—Optical discs
- G11B2220/2541—Blu-ray discs; Blue laser DVR discs
Landscapes
- Engineering & Computer Science (AREA)
- Computer Security & Cryptography (AREA)
- Signal Processing (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
The present invention relates to a storage medium, and more particularly to an optical disc.
With the advent of the multimedia era, which covers video signals, audio signals, and computer data information including moving and still images, package media such as CDs, DVDs, BDs, and various types of discs are already widely used. Attempts have been made to apply to recording media of telephones, digital cameras, broadcasts and movies.
This trend is likely to stand out in the next generation of media. In the next generation media, the size of the recording mark is getting smaller as the laser wavelength is shorter and the numerical aperture becomes larger for higher transmission speed and higher storage capacity.
Optical discs are largely read-only-memory (ROM), recordable (R) capable of recording information only once, and rewritable (Rewritable, Re capable of repeatedly writing, reading, and erasing information). ) There is a disk.
In general, an optical disc inserts a code into a burst cutting area (BCA) by irradiating a laser to a reflective layer or a recording layer located under the cover layer. In the BCA code, unique disc information, copy protection code, and the like are recorded.
In general, when marking a BCA code, the wavelength used is generally 405, 650 or 850 nm, and an objective lens having a numerical aperture (NA) of 0.6 to 1.0 or less is used to concentrate energy and record at a high energy density. Recently, a light source using a wavelength of 410 to 257 nm is also used.
Referring to FIG. 1, it can be seen that the BCA code is not clearly marked (left side view) or the BCA code is unrecognizably deformed due to deterioration or contamination of layers in the optical disc after the BCA code is marked.
This is because the energy of the laser irradiated during marking of the BCA code is strong, and after the BCA code is inserted, the shape of the cover layer, the coating layer, and the reflective layer is deformed or altered, thereby changing the size or width of the BCA code. The optical pickup device may not recognize the information properly or may cause a defect in which the information cannot be read.
An object of the present invention is to adjust the thickness of the substrate and the cover layer to prevent the diffusion and release of heat, to clearly mark the BCA code, and to prevent the loss of data by preventing the alteration of each layer in the optical disk to an optical disk In providing.
Technical problems to be achieved by the present invention are not limited to the above-mentioned technical problems, and other technical problems not mentioned above will be clearly understood by those skilled in the art from the following description. Could be.
An optical disk according to an embodiment of the present invention includes a substrate including a burst cutting area (BCA) and a data area, a reflective layer on the substrate, and a cover layer on the reflective layer, wherein the thickness of the substrate of the data area is burst It may be larger than the thickness of the substrate of the cutting region.
In addition, a recording layer may be further included between the reflective layer and the cover layer.
In addition, the thickness of the substrate of the burst cutting region may be greater than 0.6 mm and less than 1.1 mm.
In addition, the thickness of the substrate of the burst cutting region may be 1.0 mm.
In addition, the thickness of the cover layer of the burst cutting region may be greater than the thickness of the cover layer of the data region.
In addition, the thickness of the cover layer of the burst cutting region may be greater than 0.1 mm and less than 0.6 mm.
In addition, the thickness of the cover layer of the burst cutting region may be 0.2 mm.
In addition, a dielectric layer may be further included between the reflective layer and the cover layer.
In addition, the dielectric layer may be made of either ZnS-SiO 2 (ZSSO) or TiO 2 .
In addition, the dielectric layer may be between 5 and 30 nm.
In addition, the dielectric layer may be between 5 and 10 nm.
Also, the optical disc may be a BD-ROM.
Also, the optical disc may be a BD-R.
The optical disk according to an embodiment of the present invention has the effect of preventing the deterioration and contamination of the optical disk and preserving data without loss.
Details of the embodiments described below are included in the detailed description and drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.
Hereinafter, an optical disc according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
2 is a plan view of an optical disk according to an embodiment of the present invention.
2, the
When proceeding from the clamping hole on the innermost inner circumferential surface of the
In addition, it will be understood that the term 'data area' described in the future may be a term including a lead-in area and a lead-out area.
When the
The
3 to 4 are cross-sectional views of an optical disk according to an embodiment of the present invention. 3 to 4 are cross-sectional views taken along line II ′ of FIG. 2.
Referring to FIG. 3, an
The
In this case, the
The
In the
The
The
The materials constituting the
The
In addition, the
Information may be recorded in the
The
The
The
In addition, the dielectric layer may be positioned between the
Note that the dielectric layer located between the
The
In the optical disk according to the exemplary embodiment, the thickness of the
The thickness H1 of the
The thickness H1 of the
In the optical disk according to the exemplary embodiment of the present invention, the burst cutting region is formed by making the thickness H1 of the
Therefore, in the conventional optical disk, the thickness of the
Usually, when marking the BCA code, the energy of the irradiated laser is strong, and after the BCA code is inserted, the shape of the
In the present invention, the thickness (H3) of the
Referring to FIG. 4, an optical disk according to an embodiment of the present invention may be a BD-ROM.
An optical disc according to an embodiment of the present invention may include a
The optical disc of FIG. 3 does not include the recording layer and the
In addition, the optical disk according to the present invention, so that the thickness (H3) of the
5 is a cross-sectional view of an optical disk according to another embodiment of the present invention.
Referring to FIG. 5, an optical disk according to another embodiment of the present invention may include a
An optical disc according to another embodiment of the present invention may be a BD-ROM, and only the burst cutting area A is illustrated.
Here, the burst cutting region A of the optical disk may further include a
The
In addition, the
The thickness of the
In particular, when the thickness of the
The optical window varies according to the thickness of the
According to another exemplary embodiment of the present invention, the thickness H3 of the
Although the embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains can understand that the present invention can be implemented in other specific forms without changing the technical spirit or essential features. will be. Therefore, the above-described embodiments are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the appended claims rather than the detailed description, and the meaning and scope of the claims and All changes or modifications derived from the equivalent concept should be interpreted as being included in the scope of the present invention.
1 is a diagram illustrating a conventional burst cutting area and a BCA code.
2 is a plan view of an optical disk according to an embodiment of the present invention.
3 to 4 are cross-sectional views of an optical disk according to an embodiment of the present invention.
5 is a cross-sectional view of an optical disk according to another embodiment of the present invention.
Claims (13)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020080011352A KR20090085449A (en) | 2008-02-04 | 2008-02-04 | Optical disc |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020080011352A KR20090085449A (en) | 2008-02-04 | 2008-02-04 | Optical disc |
Publications (1)
Publication Number | Publication Date |
---|---|
KR20090085449A true KR20090085449A (en) | 2009-08-07 |
Family
ID=41205469
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
KR1020080011352A KR20090085449A (en) | 2008-02-04 | 2008-02-04 | Optical disc |
Country Status (1)
Country | Link |
---|---|
KR (1) | KR20090085449A (en) |
-
2008
- 2008-02-04 KR KR1020080011352A patent/KR20090085449A/en not_active Application Discontinuation
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