DE3173458D1 - Data recording medium and manufacturing method therefor - Google Patents
Data recording medium and manufacturing method thereforInfo
- Publication number
- DE3173458D1 DE3173458D1 DE8181107747T DE3173458T DE3173458D1 DE 3173458 D1 DE3173458 D1 DE 3173458D1 DE 8181107747 T DE8181107747 T DE 8181107747T DE 3173458 T DE3173458 T DE 3173458T DE 3173458 D1 DE3173458 D1 DE 3173458D1
- Authority
- DE
- Germany
- Prior art keywords
- manufacturing
- recording medium
- data recording
- method therefor
- therefor
- 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
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
- G11B7/24018—Laminated discs
- G11B7/24021—Laminated discs provided with a special shape or structure for centering or eccentricity prevention, e.g. alignment
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP55141720A JPS5766540A (en) | 1980-10-09 | 1980-10-09 | Optical information storage carrier and its manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
DE3173458D1 true DE3173458D1 (en) | 1986-02-20 |
Family
ID=15298626
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE8181107747T Expired DE3173458D1 (en) | 1980-10-09 | 1981-09-29 | Data recording medium and manufacturing method therefor |
Country Status (4)
Country | Link |
---|---|
US (1) | US4432002A (de) |
EP (1) | EP0049813B1 (de) |
JP (1) | JPS5766540A (de) |
DE (1) | DE3173458D1 (de) |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4423137A (en) * | 1980-10-28 | 1983-12-27 | Quixote Corporation | Contact printing and etching method of making high density recording medium |
JPS57169938A (en) * | 1981-04-10 | 1982-10-19 | Sony Corp | Optical type recording medium |
US5305301A (en) * | 1981-04-10 | 1994-04-19 | Sony Corporation | Optically readable record carriers |
NL8402193A (nl) * | 1984-07-11 | 1986-02-03 | Philips Nv | Optisch registratie element. |
US5273598A (en) * | 1985-02-18 | 1993-12-28 | Hitachi Maxell, Ltd. | Optical disc manufacturing method |
EP0192244B1 (de) * | 1985-02-18 | 1990-06-13 | Hitachi Maxell Ltd. | Optische Platte |
JPH07107750B2 (ja) * | 1986-02-21 | 1995-11-15 | コニカ株式会社 | 情報記録媒体 |
JPS63167442A (ja) * | 1986-12-29 | 1988-07-11 | Mitsubishi Kasei Corp | 光デイスク |
JPS63188838A (ja) * | 1987-01-31 | 1988-08-04 | Toshiba Corp | 情報記録媒体 |
US5392263A (en) | 1990-01-31 | 1995-02-21 | Sony Corporation | Magneto-optical disk system with specified thickness for protective layer on the disk relative to the numerical aperture of the objective lens |
JPH03256240A (ja) * | 1990-03-06 | 1991-11-14 | Ricoh Co Ltd | 光情報記録媒体 |
JP2616596B2 (ja) * | 1990-04-20 | 1997-06-04 | 松下電器産業株式会社 | 光ディスク |
USRE37185E1 (en) | 1990-04-20 | 2001-05-22 | Matsushita Electric Industrial Co., Ltd. | Optical head |
US5146438A (en) * | 1990-05-30 | 1992-09-08 | E. I. Du Pont De Nemours & Co. | Method of making double-sided magneto-optical disks having reduced birefringence |
TW247960B (de) * | 1992-11-16 | 1995-05-21 | Canon Kk |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3665483A (en) * | 1969-06-06 | 1972-05-23 | Chase Manhattan Capital Corp | Laser recording medium |
US4179532A (en) * | 1976-04-09 | 1979-12-18 | Polygram Gmbh | Process for producing a disc-shaped information carrier which has information in the form of a beam-reflecting structure |
DE2653831C2 (de) * | 1976-11-26 | 1982-09-09 | Polygram Gmbh, 2000 Hamburg | Plattenförmiger Informationsträger |
DE2744533A1 (de) * | 1977-10-04 | 1979-04-12 | Polygram Gmbh | Plattenfoermiger traeger zur optischen aufzeichnung und wiedergabe von signalen |
JPS5496002A (en) * | 1978-01-13 | 1979-07-30 | Hitachi Ltd | Information recording plate |
US4264911A (en) * | 1979-08-20 | 1981-04-28 | Mca Discovision, Inc. | Optical recording disc and related method of manufacture |
-
1980
- 1980-10-09 JP JP55141720A patent/JPS5766540A/ja active Granted
-
1981
- 1981-09-29 EP EP81107747A patent/EP0049813B1/de not_active Expired
- 1981-09-29 DE DE8181107747T patent/DE3173458D1/de not_active Expired
- 1981-10-06 US US06/309,102 patent/US4432002A/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
EP0049813B1 (de) | 1986-01-08 |
US4432002A (en) | 1984-02-14 |
JPS5766540A (en) | 1982-04-22 |
JPH026138B2 (de) | 1990-02-07 |
EP0049813A1 (de) | 1982-04-21 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
8364 | No opposition during term of opposition | ||
8320 | Willingness to grant licences declared (paragraph 23) |