KR20090085449A - Optical disc - Google Patents

Optical disc Download PDF

Info

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
Application number
KR1020080011352A
Other languages
Korean (ko)
Inventor
장승엽
정인호
Original Assignee
엘지전자 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to KR1020080011352A priority Critical patent/KR20090085449A/en
Publication of KR20090085449A publication Critical patent/KR20090085449A/en

Links

Images

Classifications

    • 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]
    • 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
    • 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
    • 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

Abstract

An optical disc is provided to prevent damage to the stored data resulting from the degeneration of the layers. An optical disc comprises a substrate(110), a reflective layer(120), a recording layer, and a cover layer(150). The substrate comprises a burst cutting area and a data area, where the thickness of the data area is greater than that of the burst cutting area. The reflective layer, the recording layer, and the cover layer are successively laminated on the substrate.

Description

Optical Disc

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 optical disc 100 may be a recordable Blu-ray disc or a playback-only Blu-ray disc, but is not limited thereto. That is, an optical disc such as a DVD may also fall within the scope of the present invention.

When proceeding from the clamping hole on the innermost inner circumferential surface of the optical disc 100 to the outer circumferential surface, the respective regions are examined: a clamping area 10, a burst cutting area BCA. 20 There may be a read-in zone 30, a data area 40, and a read-out zone 50. At this time, although there is a transition area between the clamping area 10 and the burst cutting area 20, it is noted that not shown.

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 burst cutting area 20 is seated in the optical disc reproducing apparatus, the optical disc device is first accessed. The burst cutting area 20 may be a variety of information such as a disc serial number or encryption information for disc copy protection through the BCA code 25. Disc key information can be recorded.

The burst cutting area 20 may be located between 21.3 (+0.0, -0.3) and 22.0 (+0.2, -0.0) mm starting from the inner circumferential surface of the optical disk. In addition, the data areas 30, 40, and 50 may be located between 22.0 (+0.2, −0.0) and 60 mm.

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 optical disc 100 according to an embodiment of the present invention may include a substrate 110, a reflective layer 120, a recording layer 130, and a dielectric layer 140. The cover layer 150 may be formed of a coating layer 160 and a coating layer 160.

 The optical disc 100 according to FIG. 3 may be a BD-R (Blu-ray disc-Recordable).

In this case, the dielectric layer 140 may be formed or removed depending on the function of the optical disk 100 and the characteristics of the material between the other components.

The substrate 110 may be made of polycarbonate, but is not limited thereto. One surface of the substrate 110 may include a protrusion and a groove that are regularly patterned.

In the optical disk 100 according to the exemplary embodiment, the thickness of the substrate 110 may vary according to the burst cutting area A and the data area B. FIG. This will be explained in detail later.

The reflective layer 120 may be positioned on the substrate 110. The reflective layer 120 may control the balance of absorption and reflection of the laser, absorption of heat, transmission, and emission by adjusting multiple reflection conditions in the recording layer 130.

The recording layer 130 may be positioned on the reflective layer 120. The recording layer 130 may be formed of a single layer or may be formed of more than two layers. Here, the case of forming a single layer is shown.

The materials constituting the recording layer 130 are mainly materials that absorb light, and the absorbed light energy is converted into thermal energy to generate heat, and also reacts to express optical contrast.

The recording layer 130 includes a first recording layer 130 including at least one selected from the group consisting of silicon (Si), germanium (Ge), and antimony (sb), silver (Ag), and antimony (Sb). , Bismuth (Bi), tellurium (Te), or titanium (Ti) may be made of a second recording layer 130 including any one or more selected from the group consisting of.

In addition, the recording layer 130 may be made of an organic material such as a dye.

Information may be recorded in the recording layer 130 through laser light having a wavelength of 405 nm and a numerical aperture of 0.8 to 1.0.

The dielectric layer 140 may be positioned on the recording layer 130. The dielectric layer 140 generally uses a material having a large optical refractive index. The desired contrast can be obtained by easily adjusting the multi-reflection conditions through the thickness adjustment of the dielectric layer 140.

 The dielectric layer 140 may be disposed between the recording layer 130 and the cover layer 150 to prevent damage to the plastic due to high temperature.

The dielectric layer 140 may also be made of ZnS-SiO 2 (ZSSO) or TiO 2, but is not limited thereto.

In addition, the dielectric layer may be positioned between the recording layer 130 and the reflective layer 120 to adjust the speed at which heat is emitted from the recording film to the reflective layer 120 to adjust the recording power and the shape of the recorded mark.

Note that the dielectric layer located between the recording layer 130 and the reflective layer 120 is not shown.

The cover layer 150 and the coating layer 160 may be positioned on the dielectric layer 140. The cover layer 150 may be attached using a transparent plastic sheet using a transparent adhesive (ultraviolet curable resin) or PSA (pressure sensitive adhesive), or may be formed using only an ultraviolet curable resin as a layer.

In the optical disk according to the exemplary embodiment, the thickness of the substrate 110 of the burst cutting area A and the data area B may be different.

The thickness H1 of the substrate 110 of the burst cutting area A may be smaller than the thickness H2 of the substrate 110 of the data area B. FIG.

The thickness H1 of the substrate 110 of the burst cutting region A may be greater than 0.6 mm and less than 1.1 mm, preferably 1.0 mm.

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 substrate 110 of the burst cutting region A smaller than the thickness H2 of the substrate 110 of the data region B. The thickness H3 of the cover layer 150 of (A) can be made larger than the thickness H4 of the cover layer 150 of the data area B. FIG.

Therefore, in the conventional optical disk, the thickness of the cover layer 150 is generally about 0.1 mm, but in the optical disk according to an embodiment of the present invention, the thickness H3 of the cover layer 150 of the burst cutting area A is It may be greater than 0.1 mm, less than 0.6 mm, preferably 0.2 mm.

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 cover layer 150, the coating layer 160, and the reflective layer 120 is deformed or altered, so that the size or width of the BCA code is changed. This may cause the optical pickup device not to properly recognize the BCA code or may cause a defect in which the information cannot be read.

In the present invention, the thickness (H3) of the cover layer 150 located in the burst cutting area (A) as thick as the above numerical range to prevent the heat generated in the reflective layer 120 to eject to the surface, preventing heat diffusion As a result, the shape of the cover layer 150 or the coating layer 160 may be prevented from being deformed. In addition, this prevents the problem that the BCA code is not properly recognized by the optical pickup device and thus the information cannot be read.

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 substrate 110, a reflective layer 120, a cover layer 150, and a coating layer 160. Here, the information to be reproduced may already be stored on the substrate 110.

The optical disc of FIG. 3 does not include the recording layer and the dielectric layer 125 in comparison with the optical disc described with reference to FIG. 3, and the description and description thereof will be omitted since the features and materials of the components are similar to those of the optical disc of FIG. 3. .

In addition, the optical disk according to the present invention, so that the thickness (H3) of the cover layer 150 located in the burst cutting area (A) as thick as the numerical range so as not to eject the heat generated in the reflective layer 120 to the surface, By preventing heat diffusion, the shape of the cover layer 150 or the coating layer 160 may be prevented from being deformed. In addition, this prevents the problem that the BCA code is not properly recognized by the optical pickup device and thus the information cannot be read.

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 substrate 110, a reflective layer 120, a dielectric layer 125, a cover layer 150, and a coating layer 160.

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 dielectric layer 125, and the dielectric layer 125 may be formed of any one of ZnS—SiO 2 (ZSSO) or TiO 2 .

The dielectric layer 125 is formed in the burst cutting region A to prevent the rate of thermal diffusion, thereby marking a uniform and clear BCA code.

In addition, the dielectric layer 125 may be disposed between the reflective layer 120 and the cover layer 150 to prevent a physical or chemical reaction between the reflective layer 120 and the cover layer 150. In particular, by separating the reflective layer 120 and the cover layer 150 in a high temperature and high humidity environment, the reflective layer 120 or the cover layer 150 may be prevented from being deformed by the reaction to recognize the data and the BCA code normally. To help.

The thickness of the dielectric layer 125 may be 5-30 nm.

In particular, when the thickness of the reflective layer 120 is 30 nm or less, the thickness of the dielectric layer 125 may be 5 to 10 nm.

The optical window varies according to the thickness of the reflective layer 120. When the thickness of the reflective layer 120 is 30 nm or less, the thickness of the dielectric layer 125 is most preferably 5 to 10 nm. The optical window refers to a region through which light passes through each layer such as the substrate 110, the reflective layer 120, and the cover layer 150 with little loss.

According to another exemplary embodiment of the present invention, the thickness H3 of the cover layer 150 positioned in the burst cutting area A is thickened as the numerical range, thereby emitting heat generated from the reflective layer 120 to the surface. It is possible to prevent the heat diffusion and prevent the shape of the cover layer 150 or the coating layer 160 from being deformed. In addition, this prevents the problem that the BCA code is not properly recognized by the optical pickup device and thus the information cannot be read.

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)

A substrate including a burst cutting region BCA and a data region; A reflective layer on the substrate; A cover layer positioned on the reflective layer; And a thickness of the substrate of the data region is greater than a thickness of the substrate of the burst cutting region. The method of claim 1, And a recording layer between the reflective layer and the cover layer. The method according to claim 1 or 2, And the thickness of the substrate in the burst cutting region is greater than 0.6 mm and less than 1.1 mm. The method of claim 3, wherein And the thickness of the substrate of the burst cutting region is 1.0 mm. The method according to claim 1 or 2, The thickness of the cover layer of the burst cutting area is larger than the thickness of the cover layer of the data area The method of claim 5, wherein The thickness of the cover layer of the burst cutting region is greater than 0.1mm, less than 0.6mm. The method of claim 6, And the thickness of the cover layer of the burst cutting region is 0.2 mm. The method of claim 1, And a dielectric layer between the reflective layer and the cover layer. The method of claim 8, The dielectric layer is made of any one of ZnS-SiO 2 (ZSSO) or TiO 2 . According to claim 8, And the dielectric layer is 5 to 30 nm. The method of claim 10, And the dielectric layer is 5 to 10 nm. The method of claim 1, And the optical disc is a BD-ROM. The method of claim 2, And the optical disc is a BD-R.
KR1020080011352A 2008-02-04 2008-02-04 Optical disc KR20090085449A (en)

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)

Similar Documents

Publication Publication Date Title
JP2000036130A (en) Optical information recording medium, its recording and reproduction method, its production and optical information recording and reproducing device
WO2008053999A1 (en) Optical information recording medium, method for manufacturing optical information recording medium, and bca (burst cutting area) marking method
JP7014152B2 (en) Optical recording medium and its manufacturing method
US20090290476A1 (en) Optical information recording medium, optical information recording/reproducing apparatus, and method of manufacturing optical information recording medium
KR100994944B1 (en) System comprising an optical information medium and an apparatus for reading/recording
US7813258B2 (en) Optical information recording medium and optical information reproducing method
US20070031631A1 (en) Ultra-violet protection of data storage media
JP2007012146A (en) Optical information recording medium and optical information processing apparatus
KR101083199B1 (en) Method of recording information, information recording medium and manufacturing method of information recording medium
JP2007149210A (en) Multilayer optical recording medium and information recording method of multilayer optical recording medium
JP2006236509A (en) Optical recording medium and its manufacturing method
JP4308117B2 (en) Information recording method and apparatus, and information recording medium
KR20090085449A (en) Optical disc
JP2008097794A (en) Single-side double-layer optical recording medium
WO2007037070A1 (en) Optical information recording medium and optical information recording medium reproducing device
JP2010514075A (en) Optical recording medium and respective device for recording and / or reading data
JP4598021B2 (en) Optical information recording medium
JP2007133970A (en) Optical recording medium and manufacturing method of the same
KR20090096049A (en) Optical disc
JP5009328B2 (en) Optical information recording medium
KR20100043761A (en) Optical recording medium
EP1695839A1 (en) Optical recoding medium and its manufacturing method, sputtering target, usage of optical recording medium, and optical recording/reproducing apparatus
WO2008032548A1 (en) Optical recording medium
JP2001273674A (en) Optical information recording medium, method for recording and reproducing the same, method for manufacturing that medium, and optical information recording and reproducing device
KR20090096047A (en) Optical disc

Legal Events

Date Code Title Description
WITN Withdrawal due to no request for examination