WO2002049021A1 - Improved optical compact disc, or cd - Google Patents
Improved optical compact disc, or cd Download PDFInfo
- Publication number
- WO2002049021A1 WO2002049021A1 PCT/IT2000/000519 IT0000519W WO0249021A1 WO 2002049021 A1 WO2002049021 A1 WO 2002049021A1 IT 0000519 W IT0000519 W IT 0000519W WO 0249021 A1 WO0249021 A1 WO 0249021A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- track
- compact disc
- improved optical
- optical compact
- disc
- Prior art date
Links
Classifications
-
- 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
Definitions
- the present invention relates to an improved optical compact disc, or CD. More particularly, the invention relates to a CD, suitable to be read and/or written by suitable electronic apparatuses, for the memorisation of data, allowing a higher memory capacity and increasing the difficulties of copying the memory contents on other writable or rewritable CD, by unauthorised users. It is well known how the use of optical supports for the memorisation of data is extremely diffused.
- audio digital or only readable (CD-ROM) or only once writable (CD-R OR CD-WORM) or re-writable (CD-RW) Compact Discs (CD) are really very much used by the industries for musical, video and photos productions, as well as in the software field.
- DA digital
- CD-ROM only readable
- CD-WORM only once writable
- CD-RW re-writable Compact Discs
- CD having a circular shape with an axial hole
- CD rotation mechanism interacting with said axial hole
- laser optical devices The housings of said apparatuses within which CD are introduced, have a circular shape and dimensions corresponding to those of the CD to be housed.
- a plurality of concentric seats can be provided, corresponding to the standard dimensions of the various kind of CD.
- the data with a binary digital format, are physically memorised on the CD as pits and lands, on the surface of the disc along a spiral- shaped track running all along the surface of the same disc.
- Reading optical apparatuses generate a laser beam, that is focused on the track, and reveal by a photo-detector the amount of light reflected by the surface of the disc, that is different whether it comes from a pit or a land.
- the physical features of the present CD are standard, according to international rules defined on 1982, and that is substantially the same. Particularly, said standard has been defined in function of specific writing and reading modes of the optical apparatuses interacting with the CD.
- the spiral-shaped track of the memorised data on a CDROM is scanned by the optical reading apparatus with a constant linear scanning velocity (CLV), the value of which is defined by the standard as included in the range between 1.2 and 1.4 m/s.
- CLV constant linear scanning velocity
- the international standard also defines the distance between two contiguous involutions of the spiral-shaped track, also known as "track pitch", that must be of 1.6 ⁇ m.
- the international standard sets that all the CD provide the presence of nine sections of the track, each of them containing specific information, identified as nine areas having a circular crown on the optically active surface of the disc.
- the following table lists said nine sections, with the relevant name and the radial distance from the centre of the disc to the beginning of the section:
- Said organisation of the disc track maintains the initially planned division for the audio digital CD.
- outer sections of the track starting from the First Lead Out are not used by CD-ROM, thus obtaining a further reduction of the real memory capacity with respect to the potential one.
- CD-R or CD-WORM once writable CD
- CD- RW re-writable CD
- the object of the present invention is that of providing in a simple and reliable way, a CD having a higher memory capacity and that cannot be copied on the present once writable CD (CD-R or CD- WORM or re-writable CD (CD-RW).
- an improved optical compact disc, or CD on which the data, with a binary digital format, are physically memorised as pits and lands of the disc surface along a spiral-shaped track running all along the surface of the disc, said track being scanned, during the data reading phase by a reading optical apparatus, by the reading optical apparatus with a constant linear velocity (CLV), the CD being characterised in that it provides at least a first portion of the track that is scanned, during the data reading phase, with a CLV included between 0.1 m/s and 1.2 m/s, preferably included between 0,9 m/s and 1.2 m/s, and/or at least a second portion of the track wherein the consecutive involutions of the spiral are separated by a constant track pitch included between 1.3 and 1.6 ⁇ m, preferably of 1.4 ⁇ m.
- CLV constant linear velocity
- said first portion of the track can be the whole the track.
- said second portion of the track can be the whole track.
- said at least first portion of the track and said at least one second portion of the track can be at least partially overlapped.
- the spiral-shaped track can comprise at least five sections, preferably five sections, the beginning of the first five sections having a radial distance from the centre of the disc of 18000 ⁇ m, 18700 ⁇ m, 21700 ⁇ m, 22500 ⁇ m and 23400 ⁇ m.
- the optical compact disc, or CD is an only readable CD, or CD-ROM.
- the reading optical apparatuses detect by a photo-detector the amount of light reflected by the disc surface, that is different according to if it comes from a pit or from a land.
- CD according to the invention provides that the reading mode is not modified, but that the track is scanned, at least in a portion of the same, by a constant linear velocity, or CLV, having a value lower than the standard value, and that pits/lands have a consequently reduced length. In this way, the amount of light reflected detected by the photo-detector for each pit/land is not modified and the amount of information memorised on the disc is higher than for a CD according to the international standard.
- the preferred embodiment of the CD according to the invention provides that in the track portions with a lower reading velocity, CLV is included between o.9 and 1.2 m/s and that pits/lands have a length consequently reduced with respect to the international standard.
- the CD according to the invention further provides that the involutions of the spiral-shaped track are, at least in a portion of the same, closer each other with respect to what provided by the international standard. Particularly, the invention provides that the track pitch in the portion with closer involutions is included between 1.3 and 1.6 ⁇ m.
- the preferred embodiment provides that the track pitch is of 1.4 ⁇ m.
- Writable or re-writable CD have physical limitations as to the minimum length of pits/lands and the minimum track pitch obtainable on their surface. Therefore, their memory capacity cannot be higher than a maximum value that is lower than the value of the CD according to the invention that therefore cannot be copied.
- CD according to the invention can also provide that the radial distance of the fourth section of the track, called Lead In, is of 22500 ⁇ m, and that the radial distance of the fifth section of the track, called Program Area, is of 23400 ⁇ m, with a consequent increase of 1 mm of the Program Area, wherein the significative data are memorised. Further embodiments, in particular for the CD-ROM, provide only the presence of the first five sections, (Continuos Track Inside, Master
- the modification of the length of pits/lands, of the track pitch distance and of the number of section along the track occurs on the mould used during the mass-production of the CD according to the invention, without any modification of the apparatuses and of the existing manufacturing modes.
- the CD according to the invention is readable by the existing optical reading apparatuses, but, as already said, cannot be integrally copied on the present writable or re-writable CD.
Landscapes
- Optical Recording Or Reproduction (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2001223952A AU2001223952A1 (en) | 2000-12-15 | 2000-12-15 | Improved optical compact disc, or cd |
PCT/IT2000/000519 WO2002049021A1 (en) | 2000-12-15 | 2000-12-15 | Improved optical compact disc, or cd |
CN 00820075 CN1461473A (en) | 2000-12-15 | 2000-12-15 | Improved small optical compact disc, or CD |
EP00987613A EP1342234A1 (en) | 2000-12-15 | 2000-12-15 | Improved optical compact disc, or cd |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/IT2000/000519 WO2002049021A1 (en) | 2000-12-15 | 2000-12-15 | Improved optical compact disc, or cd |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2002049021A1 true WO2002049021A1 (en) | 2002-06-20 |
Family
ID=11133600
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IT2000/000519 WO2002049021A1 (en) | 2000-12-15 | 2000-12-15 | Improved optical compact disc, or cd |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP1342234A1 (en) |
CN (1) | CN1461473A (en) |
AU (1) | AU2001223952A1 (en) |
WO (1) | WO2002049021A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0426872A1 (en) * | 1989-05-15 | 1991-05-15 | Sony Corporation | Optical disc recording device |
EP0527602A2 (en) * | 1991-08-09 | 1993-02-17 | Sharp Kabushiki Kaisha | Optical memory |
EP0978830A1 (en) * | 1997-04-25 | 2000-02-09 | Sanyo Electric Co., Ltd. | Recording medium and optical pickup device |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10302266A (en) * | 1997-04-24 | 1998-11-13 | Sanyo Electric Co Ltd | Optical disk |
TWI239002B (en) * | 2000-03-10 | 2005-09-01 | Sony Corp | Optical recording/reproducing apparatus, optical head apparatus, optical disc drive apparatus, tracking control method for use therein, and optical disc |
-
2000
- 2000-12-15 WO PCT/IT2000/000519 patent/WO2002049021A1/en not_active Application Discontinuation
- 2000-12-15 AU AU2001223952A patent/AU2001223952A1/en not_active Abandoned
- 2000-12-15 EP EP00987613A patent/EP1342234A1/en not_active Withdrawn
- 2000-12-15 CN CN 00820075 patent/CN1461473A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP0426872A1 (en) * | 1989-05-15 | 1991-05-15 | Sony Corporation | Optical disc recording device |
EP0527602A2 (en) * | 1991-08-09 | 1993-02-17 | Sharp Kabushiki Kaisha | Optical memory |
EP0978830A1 (en) * | 1997-04-25 | 2000-02-09 | Sanyo Electric Co., Ltd. | Recording medium and optical pickup device |
Non-Patent Citations (1)
Title |
---|
See also references of EP1342234A1 * |
Also Published As
Publication number | Publication date |
---|---|
CN1461473A (en) | 2003-12-10 |
EP1342234A1 (en) | 2003-09-10 |
AU2001223952A1 (en) | 2002-06-24 |
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