FR2355337A1 - Optical read-write system for disc memories - has disc sandwiched between covers to prevent errors due to dust particles or surface scratches (NL 20.12.77) - Google Patents

Optical read-write system for disc memories - has disc sandwiched between covers to prevent errors due to dust particles or surface scratches (NL 20.12.77)

Info

Publication number
FR2355337A1
FR2355337A1 FR7618602A FR7618602A FR2355337A1 FR 2355337 A1 FR2355337 A1 FR 2355337A1 FR 7618602 A FR7618602 A FR 7618602A FR 7618602 A FR7618602 A FR 7618602A FR 2355337 A1 FR2355337 A1 FR 2355337A1
Authority
FR
France
Prior art keywords
disc
dust particles
errors due
covers
sandwiched
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.)
Granted
Application number
FR7618602A
Other languages
French (fr)
Other versions
FR2355337B1 (en
Inventor
Claude Puech
Francois Le Carvennec
Henriette Magna
Michel Thirouar
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.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Priority to FR7618602A priority Critical patent/FR2355337A1/en
Priority to NL7706584A priority patent/NL7706584A/en
Priority to DE19772727189 priority patent/DE2727189A1/en
Priority to JP7118877A priority patent/JPS52156605A/en
Publication of FR2355337A1 publication Critical patent/FR2355337A1/en
Application granted granted Critical
Publication of FR2355337B1 publication Critical patent/FR2355337B1/fr
Granted 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
    • G11B7/24015—Air-sandwiched discs
    • 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

Abstract

A disc memory system based upon micron sized elements is constructed to avoid errors due to dust particles or scratches. The recording disc (2) is sandwiched between a transparent glass top plate (1) and a bottom plate (3). The bottom plate is located against sealing rings (4) that provides an enclosed volume that may be filled with an inert gas when the recording disc is metallic. This prevents corrosion. The reading system consists of a laser source (8), modulator (9) and focussing lens (10).
FR7618602A 1976-06-18 1976-06-18 Optical read-write system for disc memories - has disc sandwiched between covers to prevent errors due to dust particles or surface scratches (NL 20.12.77) Granted FR2355337A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
FR7618602A FR2355337A1 (en) 1976-06-18 1976-06-18 Optical read-write system for disc memories - has disc sandwiched between covers to prevent errors due to dust particles or surface scratches (NL 20.12.77)
NL7706584A NL7706584A (en) 1976-06-18 1977-06-15 PROCEDURE FOR MANUFACTURING A REGISTRIBLE AND OPTICALLY READABLE INFORMATION CARRIER AND INFORMATION CARRIER THEREFORE OBTAINED.
DE19772727189 DE2727189A1 (en) 1976-06-18 1977-06-16 OPTICALLY WRITABLE AND READABLE INFORMATION RECORDING MEDIA AND METHOD FOR ITS MANUFACTURING
JP7118877A JPS52156605A (en) 1976-06-18 1977-06-17 Data carrier and method of producing same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7618602A FR2355337A1 (en) 1976-06-18 1976-06-18 Optical read-write system for disc memories - has disc sandwiched between covers to prevent errors due to dust particles or surface scratches (NL 20.12.77)

Publications (2)

Publication Number Publication Date
FR2355337A1 true FR2355337A1 (en) 1978-01-13
FR2355337B1 FR2355337B1 (en) 1979-03-23

Family

ID=9174600

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7618602A Granted FR2355337A1 (en) 1976-06-18 1976-06-18 Optical read-write system for disc memories - has disc sandwiched between covers to prevent errors due to dust particles or surface scratches (NL 20.12.77)

Country Status (4)

Country Link
JP (1) JPS52156605A (en)
DE (1) DE2727189A1 (en)
FR (1) FR2355337A1 (en)
NL (1) NL7706584A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010017A1 (en) * 1978-09-29 1980-04-16 Thomson-Csf Protected optical disk
FR2464608A1 (en) * 1978-10-17 1981-03-06 Mca Disco Vision INFORMATION RECORDING MEDIUM

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4183094A (en) * 1978-03-20 1980-01-08 Xerox Corporation Optical storage medium using the frequency domain
JPS6037700Y2 (en) * 1978-06-07 1985-11-11 三洋電機株式会社 Structure of disk record
JPS5545166A (en) * 1978-09-25 1980-03-29 Matsushita Electric Ind Co Ltd Recording and reproducing method for optical information
FR2490858B1 (en) * 1980-09-25 1986-04-04 Rca Corp OPTICAL RECORDING MEDIUM WITH VARIABLE SENSITIVITY AND DISC CONTAINING INFORMATION, MADE BY USING SUCH MEDIUM
JPS5762831A (en) * 1980-10-02 1982-04-16 Nissan Motor Co Ltd Forging die for part having reverse gradient
JPS5766538A (en) * 1980-10-08 1982-04-22 Toshiba Corp Information storage medium
DE3176118D1 (en) * 1980-10-09 1987-05-21 Toshiba Kk Data recording medium
JPS5766539A (en) * 1980-10-09 1982-04-22 Toshiba Corp Optical disk
JPS5771247U (en) * 1980-10-17 1982-04-30
JPS5786173A (en) * 1980-11-17 1982-05-29 Toshiba Corp Recorder and reproducer
JPS5788537A (en) * 1980-11-19 1982-06-02 Toshiba Corp Optical disc
JPS5788538A (en) * 1980-11-19 1982-06-02 Toshiba Corp Optical disc
JPS5817631U (en) * 1981-07-23 1983-02-03 富士写真フイルム株式会社 optical information recording medium
JPH0680541B2 (en) * 1982-02-22 1994-10-12 株式会社日立製作所 Information recording medium
DE3416607C2 (en) * 1983-05-04 1995-03-16 Matsushita Electric Ind Co Ltd Optical disk and method of making the same
US4538159A (en) * 1984-04-16 1985-08-27 Eastman Kodak Company Ceramic overcoated optical recording element
US4527173A (en) * 1984-04-16 1985-07-02 Eastman Kodak Company Erasable, reusable optical recording element and method
JPS61111040U (en) * 1985-10-25 1986-07-14
JPS62141661A (en) * 1985-12-16 1987-06-25 Ricoh Co Ltd Optical information recording medium
DE3701801A1 (en) * 1986-01-22 1987-07-23 Ricoh Kk OPTICAL INFORMATION RECORDING MATERIAL
JPH0433553Y2 (en) * 1986-05-30 1992-08-11
JPS6323236A (en) * 1987-05-21 1988-01-30 Sanyo Electric Co Ltd Structure of disk record
JPS63841A (en) * 1987-06-26 1988-01-05 Sharp Corp Magneto-optical memory element
JPH0652589B2 (en) * 1990-11-27 1994-07-06 株式会社東芝 Method for manufacturing optical information storage carrier

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2081706A1 (en) * 1970-03-05 1971-12-10 Energy Conversion Devices Inc

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2081706A1 (en) * 1970-03-05 1971-12-10 Energy Conversion Devices Inc

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0010017A1 (en) * 1978-09-29 1980-04-16 Thomson-Csf Protected optical disk
FR2464608A1 (en) * 1978-10-17 1981-03-06 Mca Disco Vision INFORMATION RECORDING MEDIUM

Also Published As

Publication number Publication date
DE2727189A1 (en) 1977-12-29
FR2355337B1 (en) 1979-03-23
NL7706584A (en) 1977-12-20
JPS52156605A (en) 1977-12-27

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Legal Events

Date Code Title Description
ST Notification of lapse