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GB1486271A - Binary information storage - Google Patents

Binary information storage

Info

Publication number
GB1486271A
GB1486271A GB12735/74A GB1273574A GB1486271A GB 1486271 A GB1486271 A GB 1486271A GB 12735/74 A GB12735/74 A GB 12735/74A GB 1273574 A GB1273574 A GB 1273574A GB 1486271 A GB1486271 A GB 1486271A
Authority
GB
United Kingdom
Prior art keywords
data
storage material
erase
laser
stress
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.)
Expired
Application number
GB12735/74A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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 International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB1486271A publication Critical patent/GB1486271A/en
Expired legal-status Critical Current

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
    • G11B7/24—Record carriers characterised by shape, structure or physical properties, or by the selection of the material
    • G11B7/2407—Tracks or pits; Shape, structure or physical properties thereof
    • G11B7/24085—Pits
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/005—Programmed access to indexed parts of tracks of operating discs, by guiding the disc
    • 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
    • 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
    • G11C—STATIC STORES
    • G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00
    • G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam
    • G11C13/048—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using other optical storage elements
    • 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
    • G11B2007/24302—Metals or metalloids
    • G11B2007/24316—Metals or metalloids group 16 elements (i.e. chalcogenides, Se, Te)
    • 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
    • G11B2007/24318—Non-metallic elements
    • G11B2007/24324—Sulfur
    • 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
    • G11B7/2433—Metals or elements of Groups 13, 14, 15 or 16 of the Periodic Table, e.g. B, Si, Ge, As, Sb, Bi, Se or Te

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Optical Recording Or Reproduction (AREA)

Abstract

1486271 Data store INTERNATIONAL BUSINESS MACHINES CORP 21 March 1974 [30 March 1973] 12735/74 Heading G4C Binary data is stored, retrieved, and erased using a storage material which, at least at its surface exists in semiconductor and metal phases, the data being stored by inducing a metal to semiconductor phase transition by reducing the internal stress in the material at the desired location below a first threshold value, the data being retrieved by optically distinguishing between the two phases, and the data being erased either in bulk or at selected locations by inducing a semiconductor to metal phase transition by subjecting the material to an internal stress above a second threshold value greater than the first threshold value. The storage material may be samarium sulphide and reading, writing, and erasing is performed using a laser. Figs. 1-6 (not shown) illustrate schematic embodiments in which, e.g. the storage material is bent so as mechanically to stress the material to a point intermediate the two thresholds. Data is then written, read, and erased by the selective use of two lasers, one of high power and one of low power, the high power laser being used to stress the storage material above the second threshold to erase data and the low power laser being used to read data and to reduce the stress below the first, low, threshold to write data. Alternatively erasure may be performed by polishing or bending the material. Two practical embodiments are described. In the first, Fig. 7, a stationary disc 23 of storage material is used in conjunction with a beam deflector 25 to selectively access desired locations on the disc using beams from a read/write laser 31 and an erase laser 33. In the second Fig. 9 (not shown) a rotating disc is used together with a radially movable head incorporating the lasers. In the latter case each data track on the disc includes two adjacent tracks, one for the stored data and the other on which the erase beam is directed to erase data from the adjacent data track. It is also stated that ultrasonic vibrations may be used to erase selected locations in the storage material.
GB12735/74A 1973-03-30 1974-03-21 Binary information storage Expired GB1486271A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH459073A CH554582A (en) 1973-03-30 1973-03-30 PROCESS AND DEVICE FOR OPTICAL STORAGE AND READOUT OF BINARY INFORMATION.

Publications (1)

Publication Number Publication Date
GB1486271A true GB1486271A (en) 1977-09-21

Family

ID=4278925

Family Applications (1)

Application Number Title Priority Date Filing Date
GB12735/74A Expired GB1486271A (en) 1973-03-30 1974-03-21 Binary information storage

Country Status (5)

Country Link
JP (1) JPS49131041A (en)
CH (1) CH554582A (en)
DE (1) DE2408010A1 (en)
FR (1) FR2223785B1 (en)
GB (1) GB1486271A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637008A (en) * 1984-04-12 1987-01-13 Ltv Aerospace And Defense Optical erasable disk memory system utilizing duration modulated laser switching
US4774702A (en) * 1986-04-03 1988-09-27 Ltv Aerospace And Defense Company Erasable optical memory employing a marmen alloy to effect phase-change erasing in a chalcogenide film
US4817053A (en) * 1986-07-11 1989-03-28 Hitachi, Ltd. Apparatus for storing and retrieving information using an electron beam
US4922462A (en) * 1984-12-28 1990-05-01 Kabushiki Kaisha Toshiba Reversible memory structure for optical reading and writing and which is capable of erasure

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3118058A1 (en) * 1980-05-14 1982-03-11 RCA Corp., 10020 New York, N.Y. RECORD CARRIER AND METHOD FOR WRITING AN INFORMATION TRACK AND DELETING AN INFORMATION STORED IN THE CARRIER
JPS5911551A (en) * 1982-07-12 1984-01-21 Toshiba Corp Optical information storage medium
JPS61110351A (en) * 1984-11-05 1986-05-28 Fuji Photo Film Co Ltd Information recording method

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4637008A (en) * 1984-04-12 1987-01-13 Ltv Aerospace And Defense Optical erasable disk memory system utilizing duration modulated laser switching
US4922462A (en) * 1984-12-28 1990-05-01 Kabushiki Kaisha Toshiba Reversible memory structure for optical reading and writing and which is capable of erasure
US4774702A (en) * 1986-04-03 1988-09-27 Ltv Aerospace And Defense Company Erasable optical memory employing a marmen alloy to effect phase-change erasing in a chalcogenide film
US4817053A (en) * 1986-07-11 1989-03-28 Hitachi, Ltd. Apparatus for storing and retrieving information using an electron beam

Also Published As

Publication number Publication date
FR2223785A1 (en) 1974-10-25
FR2223785B1 (en) 1976-04-30
CH554582A (en) 1974-09-30
DE2408010A1 (en) 1974-10-24
JPS49131041A (en) 1974-12-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee