JP2002507309A - 磁気記録媒体 - Google Patents
磁気記録媒体Info
- Publication number
- JP2002507309A JP2002507309A JP50536599A JP50536599A JP2002507309A JP 2002507309 A JP2002507309 A JP 2002507309A JP 50536599 A JP50536599 A JP 50536599A JP 50536599 A JP50536599 A JP 50536599A JP 2002507309 A JP2002507309 A JP 2002507309A
- Authority
- JP
- Japan
- Prior art keywords
- particles
- coercive force
- recording medium
- layer
- magnetic recording
- 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
Classifications
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/62—Record carriers characterised by the selection of the material
- G11B5/68—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent
- G11B5/70—Record carriers characterised by the selection of the material comprising one or more layers of magnetisable material homogeneously mixed with a bonding agent on a base layer
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/06187—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code with magnetically detectable marking
- G06K19/06196—Constructional details
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/84—Processes or apparatus specially adapted for manufacturing record carriers
- G11B5/852—Orientation in a magnetic field
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Magnetic Record Carriers (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
- Paints Or Removers (AREA)
Abstract
Description
Claims (1)
- 【特許請求の範囲】 1.第1の保磁力を有する永久的に整列した針状磁性粒子を含む材料の層を含 み、前記層が前記第1の保磁力より大きい第2の保磁力を有する磁性粒子も含む 磁気記録媒体において、データを、針状粒子により永久的に、かつ前記第2の保 磁力を有する前記粒子により消去可能に記録することを特徴とする磁気記録媒体 。 2.上記第2の保磁力を有する前記磁性粒子が板状物である、請求項1に記載 の磁気記録媒体。 3.上記第1の保磁力を有する粒子の体積割合の、上記第2の保磁力を有する 粒子の体積割合に対する比が、34:66から55:45の間である、請求項1又は2に記 載の磁気記録媒体。 4.上記第2の保磁力を有する前記粒子が、バリウムフェライト、ストロンチ ウムフェライト、白金−コバルト及びシルマノールを含む材料の群の1又は複数 の種類を含む、請求項1から3のいずれか1項に記載の磁気記録媒体。 5.前記層が柔軟な基板に担持されている、請求項1から4のいずれか1項に 記載の磁気記録媒体。 6.請求項1から5のいずれか1項に記載の磁気記録媒体を担持する有価文書 。 7.以下の工程、 a)第1の保磁力を有する針状磁性粒子、及び前記第1の保磁力より大きい第2 の保磁力を有する非針状磁性粒子を含むスラリーを準備する工程、 b)柔軟な基板上を前記スラリーで被覆し、層を形成する工程、 c)上記層の間隔をあけた領域において前記針状磁性粒子を整列する工程、及び d)上記層を固化する工程 を含む、磁気記録媒体の製造方法。 8.以下の工程、 a)第1の保磁力を有する針状磁性粒子を含むスラリーを準備する工程、 b)前記第1の保磁力より大きい第2の保磁力を有する非針状磁性粒子を前記ス ラリーに添加する工程、 c)柔軟な基板上を前記スラリーで被覆し、層を形成する工程、 d)上記層の間隔をあけた領域において前記針状磁性粒子を整列する工程、及び e)上記層を固化する工程 を含む、磁気記録媒体の製造方法。 9.前記スラリーにおける、上記第1の保磁力を有する粒子の体積割合と、上 記第2の保磁力を有する粒子の体積割合が、34:66から55:45の間の比である、請 求項7又は8に記載の磁気記録媒体の製造方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GBGB9713592.5A GB9713592D0 (en) | 1997-06-28 | 1997-06-28 | A magnetic recording medium |
GB9713592.5 | 1997-06-28 | ||
PCT/GB1998/001829 WO1999000766A1 (en) | 1997-06-28 | 1998-06-22 | A magnetic recording medium |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2002507309A true JP2002507309A (ja) | 2002-03-05 |
JP4047393B2 JP4047393B2 (ja) | 2008-02-13 |
Family
ID=10815008
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP50536599A Expired - Fee Related JP4047393B2 (ja) | 1997-06-28 | 1998-06-22 | 磁気記録媒体、 磁気記録媒体を担持する有価文書および磁気記録媒体の製造方法 |
Country Status (11)
Country | Link |
---|---|
EP (1) | EP0992019B1 (ja) |
JP (1) | JP4047393B2 (ja) |
KR (1) | KR20010014276A (ja) |
CN (1) | CN1183518C (ja) |
AU (1) | AU8120098A (ja) |
DE (1) | DE69836481T2 (ja) |
GB (1) | GB9713592D0 (ja) |
HK (1) | HK1028663A1 (ja) |
MY (1) | MY123167A (ja) |
TW (1) | TW405114B (ja) |
WO (1) | WO1999000766A1 (ja) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DK1745940T3 (en) * | 2005-07-20 | 2014-03-03 | Jds Uniphase Corp | Two-step FOR COATING OF AN OBJECT OF SAFETY PRESSURE |
CN110246521A (zh) * | 2019-06-05 | 2019-09-17 | 陈佳 | 一种录音磁带的磁化层 |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4281043A (en) * | 1973-10-31 | 1981-07-28 | Graham Magnetics, Inc. | Polymodal magnetic recording media and compositions useful therein |
US4197989A (en) * | 1974-10-16 | 1980-04-15 | Emi Limited | Magnetic recording |
US3986205A (en) * | 1975-01-27 | 1976-10-12 | Minnesota Mining And Manufacturing Company | Dual particle population magnetic recording medium |
-
1997
- 1997-06-28 GB GBGB9713592.5A patent/GB9713592D0/en not_active Ceased
-
1998
- 1998-06-22 WO PCT/GB1998/001829 patent/WO1999000766A1/en active IP Right Grant
- 1998-06-22 JP JP50536599A patent/JP4047393B2/ja not_active Expired - Fee Related
- 1998-06-22 CN CNB988071649A patent/CN1183518C/zh not_active Expired - Fee Related
- 1998-06-22 DE DE69836481T patent/DE69836481T2/de not_active Expired - Lifetime
- 1998-06-22 EP EP98930923A patent/EP0992019B1/en not_active Expired - Lifetime
- 1998-06-22 AU AU81200/98A patent/AU8120098A/en not_active Abandoned
- 1998-06-22 KR KR1019997012398A patent/KR20010014276A/ko not_active Application Discontinuation
- 1998-06-24 MY MYPI98002869A patent/MY123167A/en unknown
- 1998-06-29 TW TW087110455A patent/TW405114B/zh not_active IP Right Cessation
-
2000
- 2000-12-15 HK HK00108115A patent/HK1028663A1/xx unknown
Also Published As
Publication number | Publication date |
---|---|
DE69836481D1 (de) | 2007-01-04 |
CN1263622A (zh) | 2000-08-16 |
WO1999000766A1 (en) | 1999-01-07 |
HK1028663A1 (en) | 2001-02-23 |
EP0992019B1 (en) | 2006-11-22 |
TW405114B (en) | 2000-09-11 |
EP0992019A1 (en) | 2000-04-12 |
CN1183518C (zh) | 2005-01-05 |
JP4047393B2 (ja) | 2008-02-13 |
KR20010014276A (ko) | 2001-02-26 |
GB9713592D0 (en) | 1997-09-03 |
MY123167A (en) | 2006-05-31 |
DE69836481T2 (de) | 2007-09-20 |
AU8120098A (en) | 1999-01-19 |
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