DE3072173D1 - Verfahren und apparat zur magnetischen aufzeichnung. - Google Patents

Verfahren und apparat zur magnetischen aufzeichnung.

Info

Publication number
DE3072173D1
DE3072173D1 DE8080400464T DE3072173T DE3072173D1 DE 3072173 D1 DE3072173 D1 DE 3072173D1 DE 8080400464 T DE8080400464 T DE 8080400464T DE 3072173 T DE3072173 T DE 3072173T DE 3072173 D1 DE3072173 D1 DE 3072173D1
Authority
DE
Germany
Prior art keywords
magnetic recording
recording
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.)
Revoked
Application number
DE8080400464T
Other languages
English (en)
Inventor
James Underwood Lemke
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.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=21847184&utm_source=***_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=DE3072173(D1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of DE3072173D1 publication Critical patent/DE3072173D1/de
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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
    • G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
    • 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
    • G11B5/127—Structure or manufacture of heads, e.g. inductive
    • G11B5/187—Structure or manufacture of the surface of the head in physical contact with, or immediately adjacent to the recording medium; Pole pieces; Gap features
    • G11B5/23—Gap features

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Paints Or Removers (AREA)
  • Magnetic Record Carriers (AREA)
DE8080400464T 1979-04-11 1980-04-09 Verfahren und apparat zur magnetischen aufzeichnung. Revoked DE3072173D1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06029095 US4302790B1 (en) 1979-04-11 1979-04-11 Magnetic recording head with effective magnetic gap length less than about 15mu inches

Publications (1)

Publication Number Publication Date
DE3072173D1 true DE3072173D1 (de) 1990-04-19

Family

ID=21847184

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8080400464T Revoked DE3072173D1 (de) 1979-04-11 1980-04-09 Verfahren und apparat zur magnetischen aufzeichnung.

Country Status (5)

Country Link
US (1) US4302790B1 (de)
EP (1) EP0018267B1 (de)
JP (5) JPS55146610A (de)
CA (1) CA1149939A (de)
DE (1) DE3072173D1 (de)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0043882A1 (de) * 1980-07-16 1982-01-20 Kodak-Pathe Magnetisches Aufzeichnungselement, Verfahren zu seiner Herstellung und seine Verwendung beim Aufzeichnen
JPS57501053A (de) * 1980-07-16 1982-06-10
WO1983003918A1 (en) * 1982-05-04 1983-11-10 Eastman Kodak Company Magnetic head having highly saturable gap liner
JP2669456B2 (ja) * 1984-09-19 1997-10-27 日立マクセル株式会社 磁気記録再生装置
US4642718A (en) * 1984-11-28 1987-02-10 Eastman Kodak Company Optimum control of overwrite by record gap length selection
US4805043A (en) * 1987-12-28 1989-02-14 Eastman Kodak Company Microgap recording using ferrimagnetic medium for magneto-optic playback
JPH0482006A (ja) * 1990-07-23 1992-03-16 Mitsubishi Electric Corp 磁気記録再生用磁気ヘッドの駆動装置
US5609948A (en) * 1992-08-21 1997-03-11 Minnesota Mining And Manufacturing Company Laminate containing diamond-like carbon and thin-film magnetic head assembly formed thereon
US5331493A (en) * 1992-08-21 1994-07-19 Minnesota Mining And Manufacturing Company Bidirectional thin-film magnetoresistive tape head assembly
US5700594A (en) * 1995-02-09 1997-12-23 Eastman Kodak Company Magnetic medium capable of supporting both longitudinal and perpendicular recording, and method of making same
WO1997020308A1 (en) * 1995-11-27 1997-06-05 Philips Electronics N.V. Combination of a magnetic record carrier and an apparatus for recording a digital information signal in a track on said record carrier
US20030002115A1 (en) * 2001-07-02 2003-01-02 Koninklijke Philips Electronics N.V. Dynamic NPR boost

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB665461A (en) * 1947-07-21 1952-01-23 Brush Dev Co Magnetic recording and reproducing
US3079468A (en) * 1958-12-24 1963-02-26 Rca Corp Magnetic recording and reproducing
US3106617A (en) * 1958-12-24 1963-10-08 Rca Corp Magnetic recording and reproducing head
US3686468A (en) * 1969-09-15 1972-08-22 Robert C Garnier Jr Magnetic transducer having two core members of distinctly different magnetic field carrying characteristics
US3862115A (en) * 1973-07-09 1975-01-21 Martin E Gerry Distortionless magnetic components such as record and reproduce heads
JPS5838843B2 (ja) * 1973-11-20 1983-08-25 ティーディーケイ株式会社 磁気記録再生方式
FR2353110A1 (fr) * 1976-03-12 1977-12-23 Kodak Pathe Nouveau produit d'enregistrement magnetique et procede pour sa preparation
JPS52130616A (en) * 1976-04-27 1977-11-02 Fuji Photo Film Co Ltd Magnetic recording method

Also Published As

Publication number Publication date
JPS55146610A (en) 1980-11-15
EP0018267A1 (de) 1980-10-29
US4302790B1 (en) 1999-06-08
JPH08297801A (ja) 1996-11-12
JPS6316808B2 (de) 1988-04-11
JPH03295002A (ja) 1991-12-26
JPH07129901A (ja) 1995-05-19
US4302790A (en) 1981-11-24
CA1149939A (en) 1983-07-12
JPH03295003A (ja) 1991-12-26
EP0018267B1 (de) 1990-03-14

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Legal Events

Date Code Title Description
8363 Opposition against the patent
8331 Complete revocation