WO1997001165A1 - Method for writing of data in an optical memory and apparatus for performing the method - Google Patents
Method for writing of data in an optical memory and apparatus for performing the method Download PDFInfo
- Publication number
- WO1997001165A1 WO1997001165A1 PCT/NO1996/000154 NO9600154W WO9701165A1 WO 1997001165 A1 WO1997001165 A1 WO 1997001165A1 NO 9600154 W NO9600154 W NO 9600154W WO 9701165 A1 WO9701165 A1 WO 9701165A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- writing
- optical memory
- write
- data
- tape
- 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
- G11B7/28—Re-recording, i.e. transcribing information from one optical record carrier on to one or more similar or dissimilar 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/003—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with webs, filaments or wires, e.g. belts, spooled tapes or films of quasi-infinite extent
-
- 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
- G11B7/002—Recording, reproducing or erasing systems characterised by the shape or form of the carrier
- G11B7/0033—Recording, reproducing or erasing systems characterised by the shape or form of the carrier with cards or other card-like flat carriers, e.g. flat sheets of optical film
-
- 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
- G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
- G11B7/14—Heads, e.g. forming of the optical beam spot or modulation of the optical beam specially adapted to record on, or to reproduce from, more than one track simultaneously
-
- 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
Definitions
- the invention concerns a method for writing of data in an optical memory by means of a write unit which emits light pulses which cause localized changes in one or more light-sensitive layers in the optical memory, and wherein the optical memory is transported past the write unit in linear movement along a path.
- the invention also concerns an apparatus for writing of data in an optical memory by means of a write unit which contains one or more pulsating light sources which illuminate localized areas in one or more light-sensitive layers in the optical memory, and wherein the optical memory is transported past the write unit in linear movement along a path.
- Optical storage media for digital data in the form of discs or cards combine substantial storage capacity with portability, i.e. the medium can easily be removed from the write/read device for storage or for transfer to another write/read device.
- Spool tape can also be used for optical data storage and has a number of features in common with discs and cards, but can in addition store considerably more data.
- the present invention concerns the storage of information on optical storage media with special emphasis on the possibility of producing a large number of copies from a master file which contains software, catalogues, music sources, video sources and the like.
- the method according to the present invention concerns the writing of data in optical media which may be in the form of a tape during a part of a production process where data are recorded in the medium.
- data storage media in the form of cards e.g., have been manufactured in the form of a wide, thick tape on a spool and run through a number of processing stages which correspond to those which are employed on a continuous tape for optical data storage. After the final stage in the process, the tape is divided into separate cards.
- the tape format entails a restriction which appears to exclude disc media, it is natural to refer to the latter, and this is done to some extent in the following. In principle all physical formats for a data storage medium can carry memory layers with very different properties.
- ROM read-only memories
- CD compact disc
- WORM read many times
- Optical data storage media can offer a substantial storage capacity and also be easy to take out, transport and store for later use.
- mass distribution of music recordings, video recordings or similar types of information there is also a requirement that there should be the possibility of transferring large volumes of data from a master source to individual relevant optical media, for example a disc, tape or card, and in a cost-effective manner.
- Two fundamentally different methods are known for prerecording data. Firstly, data can be entered into the medium as an inherent part of the actual manufacturing process for the medium. Examples of this are punching or injection moulding of the pit pattern during the manufacture of so-called CD ROM's, and photographic exposure and subsequent chemical development of photo-sensitive emulsions, e.g. optical cards which are produced by Drexler Technology Co,, Palo Alto, California, USA.
- the first method is well-established and has long been commercially exploited.
- the second method we can refer to the fact that unwritten media offer the user great flexibility and eliminate the need for batchwise production of different versions of stored material, but represent a daunting challenge for the data transfer, since large volumes of data have to be written on each initially unwritten medium at a rate and a cost which for important applications must be able to approach the cheap, high-yield methods which are employed at present in the manufacture of CD ROM's.
- a production line for compact discs delivers one disc approximately every ten seconds. With a storage capacity on the disc of, e.g., 600 Mbyte data, this means an average transfer rate of 60 Mbyte/s.
- the tape can be wound on and off by driven transport spools, while data are recorded on the tape by a laser-based write/read device.
- a system with cards mounted on a drum is known from US patent No. 4 912 312 (Haddock), where the forward and backward movement is avoided.
- Haddock placing cards on a drum and retrieval thereof after the writing appears impractical with regard to production at high speed and high volume. Haddock also appears to only involve the use of a single laser write beam.
- the data transfer rate is given as 3 Mbyte/s and can be upgraded to 12 Mbyte/s.
- the object of the present invention is therefore to avoid the above-mentioned drawbacks when transferring data at high speed for copying or production of a large number of data-carrying media from an individual master medium, while at the same time avoiding the disadvantages of the above-mentioned prior art.
- the object is especially to be able to transfer data to storage media which are physically formatted as cards or tapes.
- the cards should be joined to form a continuous tape, but could be divided into indivi ⁇ dual cards after the writing sequence has ceased.
- the object of the present invention is to specify a method for writing of data at high speed on tape or card-like storage media as well as to provide an apparatus for performing the method.
- fig. la illustrates schematically a device for parallel writing on a tape consisting of connected cards and viewed from the side
- fig. 2 illustrates how the optical data storage medium is organized with memory areas on a card and each card connected to form a continuous tape with sequentially and successively provided write units.
- Fig. 1 illustrates schematically an apparatus for writing of data in an optical memory and according to the present invention.
- the actual data storage medium is in the form of a tape 1 which is wound off a storage spool 2 and transported past a number of regularly spaced write units 5, illustrated here as 4 units S,, S 2 , S 3 , S 4 .
- the distance between each write unit S can correspond to the length of an individual card.
- the tape is cut up into cards C, if this is the preferred, final data storage medium.
- the use of the tape format as illustrated in figs, la and lb opens up new possibilities for parallelism in writing of data by laser.
- the number of laser units which can work simultaneously on a single disc or a single card is in fact extremely limited due to the space requirements.
- a medium in the form of a tape permits the number of write units to be increased arbitrarily, provided that the tape is long enough. This is illustrated more clearly in fig. 2 which shows the tape 1 viewed from above and divided into preferred equally large cards C which when assembled form the tape.
- the optical memory area on each card is divided into N fields F, illustrated here as 4 fields F,, F 2 , F 3 , F 4 which extend in the tape's direction of travel.
- Each write unit S occupies a length L, including the required distance between each write unit and the next along the tape's direction of travel, i.e. that the total write operation occupies a length NL.
- the length L is assumed to be between 3 and 20 cm depending on technical factors and costs.
- a length of 5 m for a given write operation is not excessive and the total distance between the beginning and the end of a multi-operation production line can very well be 20 m or more. If the tape is composed of cards of, e.g., 10 cm, 200 cards will constitute a distance of 20 m between the storage spool and a recording spool or the cutting point. The capacity of the storage spool 2 is expected to be many thousands of cards.
- Each write unit S covers a field F with limited width on the tape 1. Moreover, when writing by laser, each field F must be able to be written without overlapping of other fields. The positioning of each field F with regard to adjacent fields can be a difficult task and an increase in the number of fields F in the write units S increases the system's total complexity. The effect on the optimum choice of number of memory fields F cannot be described in general terms, but must consider explicit tasks concerning each individual embodiment.
- Each write unit S includes a detector which guides the write beam, as is well known in the art. Depending on the medium employed it can be practical to write each field F in direct continuation of its neighbouring field, i.e. without any intervening break.
- Known data storage media with predetermined data positions can, e.g., be especially relevant in this context.
- the present invention is expected to be able to provide write speeds which are at least as good as or much better than write speeds with the use of known media.
- the use of a single laser beam for writing on a rotating disc medium gives up to 1 Mbyte/s in currently available commercial desktop equipment.
- lasers and control systems can be used which can substantially increase the writing speeds.
- high beam deflection rates can be achieved acoustically, and there are indications that 3 Mbyte/s can be achieved with the "Laser-tape" system which employs a single beam.
- addressable laser groups (VCSEL) and positionable lasers offer the possibility of parallel writing on a large scale.
- SLM spatial light modulators
- n the effective number of data point positions under each microlens at the effective scanning rate for the laser system which reads or writes on the medium
- d the diameter of the sphere
- the effective scanning rate v should be maximized in order to achieve high speed. Two different methods will now be described.
- the object of the first is to move the optical write head physically in a forward and backward movement. This is a slow operation, since commercial optical card readers normally work at a speed of 0.5-1 m/s. With microlens- based storage media the laser system will not need to scan at a constant speed.
- a second possibility is to move the beam by means of an optical element. This can achieve a high speed by acoustooptical means, but the strong convergence of the beam makes this difficult.
- the short length of stroke for example a few mm for high values of N, simplifies the situation and displacement of the beam by means of movable optical elements can thereby be implemented.
- an apparatus which also divides the writing process between a number of cooperating, but independent write units S based on the assumption that each individual write unit can write at a speed which is not much less than that of a single, large write unit.
- the effective write speed can be increased N times by employing N smaller units instead of one large write unit, thus obtaining a maximum acceleration which is scaled in relation to N.
- a corresponding increase in speed with a single large unit will lead to a maximum acceleration which is scaled by the square of N.
- bit point in the medium
- the light beam is not stopped at each write point in the medium, but the duration of the write pulse is so short that the scanning movement is virtually effectively "frozen” during the writing of each bit point.
- the bit points become smaller in order to achieve higher storage density and the scanning rate is increased in order to give higher transfer rates, a point is reached where the movement is no longer "frozen” to a sufficient extent.
Abstract
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/981,710 US6088319A (en) | 1995-06-23 | 1996-06-24 | Method for writing of data in an optical memory, apparatus for performing the method and optical memory formed thereby |
EP96922293A EP0888611A1 (en) | 1995-06-23 | 1996-06-24 | Method for writing of data in an optical memory and apparatus for performing the method |
JP9503757A JPH10511206A (en) | 1995-06-23 | 1996-06-24 | Method for writing data to optical memory and apparatus for implementing the method |
AU63211/96A AU698561B2 (en) | 1995-06-23 | 1996-06-24 | Method for writing of data in an optical memory and apparatus for performing the method |
NO975845A NO307724B1 (en) | 1995-06-23 | 1997-12-12 | Method for writing data into an optical memory and apparatus for performing the method |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO952545A NO952545D0 (en) | 1995-06-23 | 1995-06-23 | Procedure for writing data in an optical memory |
NO952545 | 1995-06-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997001165A1 true WO1997001165A1 (en) | 1997-01-09 |
Family
ID=19898346
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/NO1996/000154 WO1997001165A1 (en) | 1995-06-23 | 1996-06-24 | Method for writing of data in an optical memory and apparatus for performing the method |
Country Status (9)
Country | Link |
---|---|
US (1) | US6088319A (en) |
EP (1) | EP0888611A1 (en) |
JP (1) | JPH10511206A (en) |
KR (1) | KR19990028335A (en) |
CN (1) | CN1193405A (en) |
AU (1) | AU698561B2 (en) |
CA (1) | CA2224783A1 (en) |
NO (1) | NO952545D0 (en) |
WO (1) | WO1997001165A1 (en) |
Families Citing this family (25)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6597397B1 (en) * | 1998-07-22 | 2003-07-22 | Eastman Kodak Company | Digital still camera with optical tape |
EP1196814A1 (en) | 1999-07-21 | 2002-04-17 | E Ink Corporation | Use of a storage capacitor to enhance the performance of an active matrix driven electronic display |
US7893435B2 (en) | 2000-04-18 | 2011-02-22 | E Ink Corporation | Flexible electronic circuits and displays including a backplane comprising a patterned metal foil having a plurality of apertures extending therethrough |
CN1237623C (en) | 2000-04-18 | 2006-01-18 | 伊英克公司 | Process for fabricating thin transistor |
US6690636B1 (en) * | 2000-09-27 | 2004-02-10 | Eastman Kodak Company | Preformatting optical recording medium |
WO2002077986A2 (en) * | 2001-03-23 | 2002-10-03 | International Business Machines Corporation | Apparatus and method for storing and reading high data capacities |
WO2002091495A2 (en) * | 2001-05-07 | 2002-11-14 | Coatue Corporation | Molecular memory device |
AU2002340795A1 (en) | 2001-05-07 | 2002-11-18 | Advanced Micro Devices, Inc. | Reversible field-programmable electric interconnects |
DE60220912T2 (en) * | 2001-05-07 | 2008-02-28 | Advanced Micro Devices, Inc., Sunnyvale | MEMORY DEVICE WITH A SELF-INSTALLING POLYMER AND METHOD FOR THE PRODUCTION THEREOF |
WO2002091494A1 (en) * | 2001-05-07 | 2002-11-14 | Advanced Micro Devices, Inc. | Switch element having memeory effect |
EP1390984B1 (en) | 2001-05-07 | 2009-08-26 | Advanced Micro Devices, Inc. | Floating gate memory device using composite molecular material |
WO2002091385A1 (en) * | 2001-05-07 | 2002-11-14 | Advanced Micro Devices, Inc. | Molecular memory cell |
US6756620B2 (en) * | 2001-06-29 | 2004-06-29 | Intel Corporation | Low-voltage and interface damage-free polymer memory device |
US6624457B2 (en) | 2001-07-20 | 2003-09-23 | Intel Corporation | Stepped structure for a multi-rank, stacked polymer memory device and method of making same |
US6768157B2 (en) | 2001-08-13 | 2004-07-27 | Advanced Micro Devices, Inc. | Memory device |
US6806526B2 (en) | 2001-08-13 | 2004-10-19 | Advanced Micro Devices, Inc. | Memory device |
EP1434232B1 (en) | 2001-08-13 | 2007-09-19 | Advanced Micro Devices, Inc. | Memory cell |
US6858481B2 (en) | 2001-08-13 | 2005-02-22 | Advanced Micro Devices, Inc. | Memory device with active and passive layers |
US6838720B2 (en) * | 2001-08-13 | 2005-01-04 | Advanced Micro Devices, Inc. | Memory device with active passive layers |
KR100433407B1 (en) * | 2002-02-06 | 2004-05-31 | 삼성광주전자 주식회사 | Upright-type vacuum cleaner |
US7012276B2 (en) * | 2002-09-17 | 2006-03-14 | Advanced Micro Devices, Inc. | Organic thin film Zener diodes |
US7185814B2 (en) * | 2002-10-16 | 2007-03-06 | Dcard, Inc. | Layer structure and method of manufacture for optical memory strip (OMS) |
US7049153B2 (en) * | 2003-04-23 | 2006-05-23 | Micron Technology, Inc. | Polymer-based ferroelectric memory |
JP2013065387A (en) * | 2011-08-31 | 2013-04-11 | Panasonic Corp | Record reproduction apparatus |
US8493823B1 (en) * | 2012-10-31 | 2013-07-23 | Oracle International Corporation | Variable data transfer rate optical tape drive system and method |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2189926A (en) * | 1986-04-23 | 1987-11-04 | Drexler Tech | Optical recording medium |
DE2717000C2 (en) * | 1976-04-21 | 1991-09-26 | Optical Recording Corp., Toronto, Ontario, Ca |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4818852A (en) * | 1986-01-24 | 1989-04-04 | Drexler Technology Corporation | Method for forming data cards with registered images |
US4957580A (en) * | 1986-04-23 | 1990-09-18 | Drexler Technology Corp. | Method for making an optical data card |
JPS6396746A (en) * | 1986-10-11 | 1988-04-27 | Sony Corp | Optical recording system |
US4820913A (en) * | 1986-12-02 | 1989-04-11 | Drexler Technology Corporation | Multiple card recording system |
-
1995
- 1995-06-23 NO NO952545A patent/NO952545D0/en unknown
-
1996
- 1996-06-24 EP EP96922293A patent/EP0888611A1/en not_active Withdrawn
- 1996-06-24 JP JP9503757A patent/JPH10511206A/en active Pending
- 1996-06-24 CN CN96196355A patent/CN1193405A/en active Pending
- 1996-06-24 WO PCT/NO1996/000154 patent/WO1997001165A1/en not_active Application Discontinuation
- 1996-06-24 US US08/981,710 patent/US6088319A/en not_active Expired - Fee Related
- 1996-06-24 AU AU63211/96A patent/AU698561B2/en not_active Ceased
- 1996-06-24 KR KR1019970709650A patent/KR19990028335A/en not_active Application Discontinuation
- 1996-06-24 CA CA002224783A patent/CA2224783A1/en not_active Abandoned
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2717000C2 (en) * | 1976-04-21 | 1991-09-26 | Optical Recording Corp., Toronto, Ontario, Ca | |
GB2189926A (en) * | 1986-04-23 | 1987-11-04 | Drexler Tech | Optical recording medium |
Non-Patent Citations (1)
Title |
---|
PATENT ABSTRACTS OF JAPAN, Vol. 12, No. 334, P-756; & JP,A,63 096 746 (SONY CORP), 27 April 1988. * |
Also Published As
Publication number | Publication date |
---|---|
CN1193405A (en) | 1998-09-16 |
EP0888611A1 (en) | 1999-01-07 |
KR19990028335A (en) | 1999-04-15 |
AU6321196A (en) | 1997-01-22 |
CA2224783A1 (en) | 1997-01-09 |
NO952545D0 (en) | 1995-06-23 |
AU698561B2 (en) | 1998-10-29 |
JPH10511206A (en) | 1998-10-27 |
US6088319A (en) | 2000-07-11 |
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