CN1602524A - Multilayer optical disc - Google Patents
Multilayer optical disc Download PDFInfo
- Publication number
- CN1602524A CN1602524A CNA028172965A CN02817296A CN1602524A CN 1602524 A CN1602524 A CN 1602524A CN A028172965 A CNA028172965 A CN A028172965A CN 02817296 A CN02817296 A CN 02817296A CN 1602524 A CN1602524 A CN 1602524A
- Authority
- CN
- China
- Prior art keywords
- layer
- pit
- reflecting material
- groove pattern
- making
- Prior art date
- Legal status (The legal status 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 status listed.)
- Pending
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Classifications
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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
- G11B7/24035—Recording layers
- G11B7/24038—Multiple laminated recording layers
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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
- G11B7/24062—Reflective layers
-
- 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
- G11B7/242—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers
- G11B7/243—Record carriers characterised by shape, structure or physical properties, or by the selection of the material characterised by the selection of the material of recording layers comprising inorganic materials only, e.g. ablative layers
-
- 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
- G11B7/26—Apparatus or processes specially adapted for the manufacture of record carriers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
Abstract
To reduce loss of the reading light, a multilayer optical disc (figure 1, disk), such as a disc in a CD or DVD format, has multiple layers (figure 1, layer) with pits or tracks and a reflective material only in the pits or tracks. The disc can be used as a ROM or WORM disc. A methods of making it are also disclosed.
Description
Background technology
Technical field
Multiplayer optical disk has been proposed: US patent on March 21st, 6039898,2000, B.Glushko and United States Patent (USP) (with reference to IBM multiplayer optical disk patent) in following patent.The factor of the number of plies of restriction in the multiplayer optical disk is when light beam passes multiplayer optical disk, and is that lens pick up or be incident on the loss that is read the data-signal on the layer.In this case, for example relevant except can being reduced to minimum described loss with light reflection from each layer of multiplayer optical disk, and outside the process loss that causes by its different reflectivity, also existence other loss relevant with method for reading data.For example, IBM Corporation's patent proposes the phase modulation in conjunction with the data-signal that receives from pit, uses partially reflecting layer.Be incident on the I on layer N
NSignal should equal I
N=(1-R)
N, R is the reflection coefficient on the individual layer here.For reduce when light beam in multiplayer optical disk by the time loss that produces, following record layout on we propose every layer: only form data cell in the road, be pit (ROM), or arbitrary middle reflecting material, the space between light does not penetrate with having any loss arranged of groove (WORM).In this case, in the CD form, the loss in every layer approximately reduces by 70%, and in the DVD form, every layer loss approximately reduces by 50%.This method also allows to increase the number of plies in the multiplayer optical disk.
Can use several method on laminar surface, to form the required system of reflection pit or groove:
Method 1. is utilized present CD method, forms the data relief pattern on card.Subsequently, with reflection coefficient be the reflecting material coating card of R.When being heated, metal that its transmission coefficient can change (ROM) or metal alloy or their oxide (WORM), for example ITO can be used as this reflecting material.Subsequently, remove metal from flat surface, keep the method for selective etching of the metal of recess simultaneously, only in pit or road, keep reflecting material by utilizing.Adoptable selective etch technology is angled surface ion etching.
Method 2. at first forms to comprise the mask of data with pit or groove (in fact, they are the cavitys that form) form in metal.Subsequently, utilize and lift, on laminar surface, form the matching system of respective dimple or groove from photoetching (lift-offphotolithography) technology.For this reason, the reflecting material of mentioning in the use example in front.
Method 3. is utilized when being heated, the metal alloy that its transmission coefficient can change or other oxide, for example ITO coat surface.Subsequently, by illuminate and pit between the reflection horizon, utilize the steady laser unit to form this layer.
The method of utilizing the author to propose previously can prepare multiplayer optical disk.
Claims (6)
1, a kind of multiplayer optical disk of preserving information, described CD comprises:
A plurality of hyaline layers;
In every layer in a plurality of hyaline layers, preserve the pit or the groove pattern of information; With
Only be arranged on the reflecting material in pit or the groove pattern.
2, according to the described CD of claim 1, wherein said CD is the ROM CD.
3, according to the described CD of claim 1, wherein said CD is the WORM CD.
4, a kind of method of making the CD of claim 1 comprises: for each layer in a plurality of hyaline layers, and deposition of reflective material on this layer, and this reflecting material of etching, thus reflecting material only is retained in pit or the groove pattern.
5, a kind of method of making the CD of claim 1 is wherein utilized to lift from photoetching technique to apply reflecting material.
6, a kind of method of making the CD of claim 1 comprises: each layer in a plurality of hyaline layers, apply the material that its transmission coefficient changes when being heated, and with the described material of LASER HEATING, to determine pit or groove pattern.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US30441601P | 2001-07-12 | 2001-07-12 | |
| US60/304,416 | 2001-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1602524A true CN1602524A (en) | 2005-03-30 |
Family
ID=23176422
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA028172965A Pending CN1602524A (en) | 2001-07-12 | 2002-07-12 | Multilayer optical disc |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP1419503A4 (en) |
| JP (1) | JP2004535646A (en) |
| KR (1) | KR20040054660A (en) |
| CN (1) | CN1602524A (en) |
| WO (1) | WO2003007297A1 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9275671B2 (en) | 2011-06-09 | 2016-03-01 | Case Western Reserve University | Optical information storage medium |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4219704A (en) * | 1974-10-21 | 1980-08-26 | Eli S. Jacobs | Record playback apparatus for optical data records |
| JP2506138B2 (en) * | 1987-12-25 | 1996-06-12 | シャープ株式会社 | Optical memory device |
| US5455818A (en) * | 1992-01-22 | 1995-10-03 | Brother Kogyo Kabushiki Kaisha | Optical recording medium |
| JP3151909B2 (en) * | 1992-02-18 | 2001-04-03 | ブラザー工業株式会社 | Optical recording medium and substrate for optical recording medium |
| JPH09326136A (en) * | 1996-06-05 | 1997-12-16 | Sony Corp | Optical recording medium and its production |
| US6039898A (en) * | 1997-05-08 | 2000-03-21 | O.M.D. Optical Memory Devices, Ltd. | Optical memory device and a method for manufacturing thereof |
| US6075764A (en) * | 1998-02-13 | 2000-06-13 | International Business Machines Corporation | Laser-writable information recording medium with reference track for laser-writing information thereto using edge following |
-
2002
- 2002-07-12 WO PCT/US2002/021825 patent/WO2003007297A1/en active Application Filing
- 2002-07-12 EP EP02756425A patent/EP1419503A4/en not_active Withdrawn
- 2002-07-12 CN CNA028172965A patent/CN1602524A/en active Pending
- 2002-07-12 JP JP2003512977A patent/JP2004535646A/en active Pending
- 2002-07-12 KR KR10-2004-7000448A patent/KR20040054660A/en not_active Application Discontinuation
Also Published As
| Publication number | Publication date |
|---|---|
| WO2003007297A1 (en) | 2003-01-23 |
| KR20040054660A (en) | 2004-06-25 |
| JP2004535646A (en) | 2004-11-25 |
| EP1419503A4 (en) | 2008-03-26 |
| EP1419503A1 (en) | 2004-05-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |