DE3936690A1 - Magneto-optisches aufzeichnungsverfahren und aufzeichnungsmaterial - Google Patents
Magneto-optisches aufzeichnungsverfahren und aufzeichnungsmaterialInfo
- Publication number
- DE3936690A1 DE3936690A1 DE3936690A DE3936690A DE3936690A1 DE 3936690 A1 DE3936690 A1 DE 3936690A1 DE 3936690 A DE3936690 A DE 3936690A DE 3936690 A DE3936690 A DE 3936690A DE 3936690 A1 DE3936690 A1 DE 3936690A1
- Authority
- DE
- Germany
- Prior art keywords
- magnetic layer
- magneto
- layer
- recording material
- magnetic
- 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
Links
- 239000000463 material Substances 0.000 title claims description 195
- 238000000034 method Methods 0.000 title claims description 72
- 230000005291 magnetic effect Effects 0.000 claims description 253
- 230000005415 magnetization Effects 0.000 claims description 43
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 28
- 150000002910 rare earth metals Chemical class 0.000 claims description 27
- 229910052723 transition metal Inorganic materials 0.000 claims description 25
- 150000003624 transition metals Chemical class 0.000 claims description 24
- 229910045601 alloy Inorganic materials 0.000 claims description 16
- 239000000956 alloy Substances 0.000 claims description 16
- 239000000758 substrate Substances 0.000 claims description 14
- 229910000808 amorphous metal alloy Inorganic materials 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 claims description 9
- 238000012217 deletion Methods 0.000 claims description 7
- 230000037430 deletion Effects 0.000 claims description 7
- 230000008033 biological extinction Effects 0.000 claims description 2
- -1 rare earth transition metal Chemical class 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 297
- 239000011241 protective layer Substances 0.000 description 40
- 230000008569 process Effects 0.000 description 24
- 229910001004 magnetic alloy Inorganic materials 0.000 description 14
- 238000003860 storage Methods 0.000 description 13
- 239000000203 mixture Substances 0.000 description 10
- 230000008878 coupling Effects 0.000 description 9
- 238000010168 coupling process Methods 0.000 description 9
- 238000005859 coupling reaction Methods 0.000 description 9
- 238000004544 sputter deposition Methods 0.000 description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 6
- 238000002835 absorbance Methods 0.000 description 6
- 230000001419 dependent effect Effects 0.000 description 6
- 239000003989 dielectric material Substances 0.000 description 6
- 239000011521 glass Substances 0.000 description 6
- 229910052697 platinum Inorganic materials 0.000 description 6
- 229910052692 Dysprosium Inorganic materials 0.000 description 5
- 229910052688 Gadolinium Inorganic materials 0.000 description 5
- 229910052771 Terbium Inorganic materials 0.000 description 5
- 229910052804 chromium Inorganic materials 0.000 description 5
- 229910052759 nickel Inorganic materials 0.000 description 5
- 230000001681 protective effect Effects 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011347 resin Substances 0.000 description 5
- 229910052691 Erbium Inorganic materials 0.000 description 4
- 229910052689 Holmium Inorganic materials 0.000 description 4
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- QDOXWKRWXJOMAK-UHFFFAOYSA-N dichromium trioxide Chemical compound O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000007789 gas Substances 0.000 description 4
- 239000004417 polycarbonate Substances 0.000 description 4
- 229920000515 polycarbonate Polymers 0.000 description 4
- 238000002310 reflectometry Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 229910052726 zirconium Inorganic materials 0.000 description 4
- 229910052779 Neodymium Inorganic materials 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 229910052593 corundum Inorganic materials 0.000 description 3
- 239000003822 epoxy resin Substances 0.000 description 3
- 238000005188 flotation Methods 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 229920000647 polyepoxide Polymers 0.000 description 3
- 229910052719 titanium Inorganic materials 0.000 description 3
- 238000001771 vacuum deposition Methods 0.000 description 3
- 229910001845 yogo sapphire Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 229910006501 ZrSiO Inorganic materials 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 229910052738 indium Inorganic materials 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Chemical compound [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 2
- PBCFLUZVCVVTBY-UHFFFAOYSA-N tantalum pentoxide Inorganic materials O=[Ta](=O)O[Ta](=O)=O PBCFLUZVCVVTBY-UHFFFAOYSA-N 0.000 description 2
- 229910052714 tellurium Inorganic materials 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- 239000004925 Acrylic resin Substances 0.000 description 1
- 229920000178 Acrylic resin Polymers 0.000 description 1
- 229910017083 AlN Inorganic materials 0.000 description 1
- 229910017109 AlON Inorganic materials 0.000 description 1
- 102100032047 Alsin Human genes 0.000 description 1
- 101710187109 Alsin Proteins 0.000 description 1
- 229910019912 CrN Inorganic materials 0.000 description 1
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 description 1
- 229910052777 Praseodymium Inorganic materials 0.000 description 1
- 229910052772 Samarium Inorganic materials 0.000 description 1
- 229910052770 Uranium Inorganic materials 0.000 description 1
- 229910008322 ZrN Inorganic materials 0.000 description 1
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052787 antimony Inorganic materials 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000000313 electron-beam-induced deposition Methods 0.000 description 1
- 230000005293 ferrimagnetic effect Effects 0.000 description 1
- 229920002313 fluoropolymer Polymers 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- LNEPOXFFQSENCJ-UHFFFAOYSA-N haloperidol Chemical compound C1CC(O)(C=2C=CC(Cl)=CC=2)CCN1CCCC(=O)C1=CC=C(F)C=C1 LNEPOXFFQSENCJ-UHFFFAOYSA-N 0.000 description 1
- 230000002209 hydrophobic effect Effects 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- PJXISJQVUVHSOJ-UHFFFAOYSA-N indium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[In+3].[In+3] PJXISJQVUVHSOJ-UHFFFAOYSA-N 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000007733 ion plating Methods 0.000 description 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N magnesium oxide Inorganic materials [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 229910052758 niobium Inorganic materials 0.000 description 1
- 239000012044 organic layer Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920001568 phenolic resin Polymers 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920002120 photoresistant polymer Polymers 0.000 description 1
- 229920003229 poly(methyl methacrylate) Polymers 0.000 description 1
- 239000005297 pyrex Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229910052703 rhodium Inorganic materials 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000005368 silicate glass Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000005361 soda-lime glass Substances 0.000 description 1
- 229910052950 sphalerite Inorganic materials 0.000 description 1
- 238000004528 spin coating Methods 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052715 tantalum Inorganic materials 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
- 229910052727 yttrium Inorganic materials 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
- XLOMVQKBTHCTTD-UHFFFAOYSA-N zinc oxide Inorganic materials [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 description 1
- 229910052984 zinc sulfide Inorganic materials 0.000 description 1
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10582—Record carriers characterised by the selection of the material or by the structure or form
- G11B11/10586—Record carriers characterised by the selection of the material or by the structure or form characterised by the selection of the material
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B11/00—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor
- G11B11/10—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field
- G11B11/105—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing
- G11B11/10502—Recording on or reproducing from the same record carrier wherein for these two operations the methods are covered by different main groups of groups G11B3/00 - G11B7/00 or by different subgroups of group G11B9/00; Record carriers therefor using recording by magnetic means or other means for magnetisation or demagnetisation of a record carrier, e.g. light induced spin magnetisation; Demagnetisation by thermal or stress means in the presence or not of an orienting magnetic field using a beam of light or a magnetic field for recording by change of magnetisation and a beam of light for reproducing, i.e. magneto-optical, e.g. light-induced thermomagnetic recording, spin magnetisation recording, Kerr or Faraday effect reproducing characterised by the transducing operation to be executed
- G11B11/10517—Overwriting or erasing
- G11B11/10519—Direct overwriting, i.e. performing erasing and recording using the same transducing means
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP28005888A JP2753583B2 (ja) | 1988-11-04 | 1988-11-04 | 光磁気記録媒体 |
| JP32294488 | 1988-12-21 | ||
| JP19624989 | 1989-07-28 | ||
| JP26376589A JP2899898B2 (ja) | 1988-12-21 | 1989-10-09 | 光磁気記録方法 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| DE3936690A1 true DE3936690A1 (de) | 1990-05-10 |
| DE3936690C2 DE3936690C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1993-07-29 |
Family
ID=27475800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| DE3936690A Granted DE3936690A1 (de) | 1988-11-04 | 1989-11-03 | Magneto-optisches aufzeichnungsverfahren und aufzeichnungsmaterial |
Country Status (3)
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0406023A3 (en) * | 1989-06-30 | 1992-03-04 | Sharp Kabushiki Kaisha | Opto-magnetic recording medium |
| EP0452155A3 (en) * | 1990-04-12 | 1992-03-18 | Nikon Corporation | Over-write capable magnetooptical recording medium having plastic substrate |
| EP0454858A4 (en) * | 1989-11-10 | 1993-02-24 | Mitsubishi Kasei Corporation | Magnetooptical recording medium |
| EP0540847A1 (en) * | 1991-09-11 | 1993-05-12 | Shin-Etsu Chemical Co., Ltd. | Improvement in magneto-optical recording medium |
| EP0612066A1 (en) * | 1993-02-16 | 1994-08-24 | Nikon Corporation | A magneto-optical disk and a playback method thereof |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5233575A (en) * | 1989-11-10 | 1993-08-03 | Mitsubishi Kasei Corporation | Magneto-optical recording medium |
| US5719829A (en) * | 1993-03-04 | 1998-02-17 | Canon Kabushiki Kaisha | Magnetooptical recording medium allowing super-resolution, and information reproduction method using the medium |
| DE69430099T2 (de) * | 1993-11-24 | 2002-10-31 | Mitsubishi Chemical Corp., Tokio/Tokyo | Magnetooptisches Aufzeichnungsmedium und Verfahren zum Auslesen desselben |
| US5414678A (en) * | 1994-09-02 | 1995-05-09 | Minnesota Mining And Manufacturing Company | Magneto-optic recording medium having two recording layers, and drive for same |
| JPH08297880A (ja) * | 1995-02-27 | 1996-11-12 | Sharp Corp | 磁界変調記録方法および磁界変調記録装置 |
| JPH09198734A (ja) * | 1996-01-19 | 1997-07-31 | Matsushita Electric Ind Co Ltd | 光磁気ディスク装置 |
| JP2002092888A (ja) * | 2000-09-08 | 2002-03-29 | Sony Corp | 光ディスク及び光磁気ディスク並びにこれらのディスク装置及びデータ記録方法 |
| US7251089B2 (en) * | 2005-01-07 | 2007-07-31 | Seagate Technology Llc | Storage medium with overcoat layer for enhanced heating |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56153546A (en) * | 1980-04-28 | 1981-11-27 | Ricoh Co Ltd | Magnetic recording medium |
| JPS5778692A (en) * | 1980-11-04 | 1982-05-17 | Hitachi Ltd | Memory access system of electronic computer |
| JPS60177455A (ja) * | 1984-02-22 | 1985-09-11 | Nippon Kogaku Kk <Nikon> | 光磁気記録媒体 |
| JPS62175948A (ja) * | 1985-06-11 | 1987-08-01 | Nippon Kogaku Kk <Nikon> | オーバーライト可能な光磁気記録方法、それに使用される光磁気記録装置及び光磁気記録媒体、並びに変調方法、変調装置及び光磁気記録媒体 |
| JPS63153752A (ja) * | 1986-07-08 | 1988-06-27 | Canon Inc | 光磁気記録媒体及びその記録方法 |
| EP0361970A2 (en) * | 1988-09-30 | 1990-04-04 | Kabushiki Kaisha Toshiba | Method of magneto-optically recording/erasing information and magneto-optical information storage medium |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57113402A (en) * | 1981-01-05 | 1982-07-14 | Ricoh Co Ltd | Method and device for vertical thermomagnetic recording |
| JPH07105082B2 (ja) * | 1985-11-28 | 1995-11-13 | ソニー株式会社 | 光磁気記録媒体 |
| US4882718A (en) * | 1986-03-07 | 1989-11-21 | Movid Information Technology, Inc. | Single-head, direct overwrite magneto-optic system and method |
| DE3752222T2 (de) * | 1986-07-08 | 1999-03-25 | Canon K.K., Tokio/Tokyo | Magnetoptisches Aufzeichnungsmedium mit der Möglichkeit des Überschreibens mit zwei oder mehr Magnetschichten und dieses Medium verwendende Aufzeichnungsmethode |
| CA1322408C (en) * | 1986-08-20 | 1993-09-21 | Tomiji Tanaka | Thermomagnetic recording method applying power modulated laser on a magnetically coupled double layer structure of perpendicular anisotropy film |
| JP2570270B2 (ja) * | 1986-10-08 | 1997-01-08 | 株式会社ニコン | ツービームによる光磁気記録方法及び装置 |
| AU600576B2 (en) * | 1987-04-24 | 1990-08-16 | Sony Corporation | Thermomagnetic recording method applying power modulated laser on a magnetically coupled multi-layer structure of perpendicular anisotropy magnetic film |
| JP2754537B2 (ja) * | 1987-05-18 | 1998-05-20 | 株式会社ニコン | 光磁気記録媒体並びにそれを使用したビット形成方法 |
| EP0316188A3 (en) * | 1987-11-12 | 1990-10-31 | MOVID Information Technology, Inc. | Method and apparatus for direct overwriting of digital data recorded on magneto-optical recording media including a direct overwrite magneto-optic system for strip erasing and recording elongated domains and a single-head, direct overwrite magneto-optic system |
-
1989
- 1989-11-02 GB GB8924671A patent/GB2234623B/en not_active Expired - Lifetime
- 1989-11-03 DE DE3936690A patent/DE3936690A1/de active Granted
-
1992
- 1992-09-21 US US07/948,452 patent/US5420836A/en not_active Expired - Lifetime
-
1993
- 1993-12-27 US US08/173,913 patent/US5461595A/en not_active Expired - Lifetime
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56153546A (en) * | 1980-04-28 | 1981-11-27 | Ricoh Co Ltd | Magnetic recording medium |
| JPS5778692A (en) * | 1980-11-04 | 1982-05-17 | Hitachi Ltd | Memory access system of electronic computer |
| JPS60177455A (ja) * | 1984-02-22 | 1985-09-11 | Nippon Kogaku Kk <Nikon> | 光磁気記録媒体 |
| JPS62175948A (ja) * | 1985-06-11 | 1987-08-01 | Nippon Kogaku Kk <Nikon> | オーバーライト可能な光磁気記録方法、それに使用される光磁気記録装置及び光磁気記録媒体、並びに変調方法、変調装置及び光磁気記録媒体 |
| JPS63153752A (ja) * | 1986-07-08 | 1988-06-27 | Canon Inc | 光磁気記録媒体及びその記録方法 |
| EP0361970A2 (en) * | 1988-09-30 | 1990-04-04 | Kabushiki Kaisha Toshiba | Method of magneto-optically recording/erasing information and magneto-optical information storage medium |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0406023A3 (en) * | 1989-06-30 | 1992-03-04 | Sharp Kabushiki Kaisha | Opto-magnetic recording medium |
| EP0454858A4 (en) * | 1989-11-10 | 1993-02-24 | Mitsubishi Kasei Corporation | Magnetooptical recording medium |
| EP0452155A3 (en) * | 1990-04-12 | 1992-03-18 | Nikon Corporation | Over-write capable magnetooptical recording medium having plastic substrate |
| EP0540847A1 (en) * | 1991-09-11 | 1993-05-12 | Shin-Etsu Chemical Co., Ltd. | Improvement in magneto-optical recording medium |
| EP0612066A1 (en) * | 1993-02-16 | 1994-08-24 | Nikon Corporation | A magneto-optical disk and a playback method thereof |
| US5430695A (en) * | 1993-02-16 | 1995-07-04 | Nikon Corporation | Magneto-optical disk having a magnetic film with two layers and a playback method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2234623B (en) | 1993-04-14 |
| US5420836A (en) | 1995-05-30 |
| GB2234623A (en) | 1991-02-06 |
| GB8924671D0 (en) | 1989-12-20 |
| US5461595A (en) | 1995-10-24 |
| DE3936690C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) | 1993-07-29 |
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