FR2355337B1 - - Google Patents
Info
- Publication number
- FR2355337B1 FR2355337B1 FR7618602A FR7618602A FR2355337B1 FR 2355337 B1 FR2355337 B1 FR 2355337B1 FR 7618602 A FR7618602 A FR 7618602A FR 7618602 A FR7618602 A FR 7618602A FR 2355337 B1 FR2355337 B1 FR 2355337B1
- Authority
- FR
- France
- 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
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
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Optical Record Carriers And Manufacture Thereof (AREA)
- Manufacturing Optical Record Carriers (AREA)
- Optical Recording Or Reproduction (AREA)
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 FR2355337A1 (en) | 1978-01-13 |
FR2355337B1 true 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) |
Families Citing this family (26)
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 |
FR2437668A1 (en) * | 1978-09-29 | 1980-04-25 | Thomson Csf | PROTECTED OPTICAL DISC |
CH636212A5 (en) * | 1978-10-17 | 1983-05-13 | Mca Disco Vision | Medium carrying recorded 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 |
JPS5766539A (en) * | 1980-10-09 | 1982-04-22 | Toshiba Corp | Optical disk |
EP0049821B1 (en) * | 1980-10-09 | 1987-04-15 | Kabushiki Kaisha Toshiba | Data recording medium |
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 |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3626386A (en) * | 1970-03-05 | 1971-12-07 | Energy Conversion Devices Inc | Information storage systems |
-
1976
- 1976-06-18 FR FR7618602A patent/FR2355337A1/en active Granted
-
1977
- 1977-06-15 NL NL7706584A patent/NL7706584A/en not_active Application Discontinuation
- 1977-06-16 DE DE19772727189 patent/DE2727189A1/en active Pending
- 1977-06-17 JP JP7118877A patent/JPS52156605A/en active Pending
Also Published As
Publication number | Publication date |
---|---|
NL7706584A (en) | 1977-12-20 |
FR2355337A1 (en) | 1978-01-13 |
JPS52156605A (en) | 1977-12-27 |
DE2727189A1 (en) | 1977-12-29 |
Similar Documents
Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |