EP0108074A4 - Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung. - Google Patents

Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung.

Info

Publication number
EP0108074A4
EP0108074A4 EP19830901054 EP83901054A EP0108074A4 EP 0108074 A4 EP0108074 A4 EP 0108074A4 EP 19830901054 EP19830901054 EP 19830901054 EP 83901054 A EP83901054 A EP 83901054A EP 0108074 A4 EP0108074 A4 EP 0108074A4
Authority
EP
European Patent Office
Prior art keywords
gap
sendust
ferrite
magnetic
pole
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.)
Withdrawn
Application number
EP19830901054
Other languages
English (en)
French (fr)
Other versions
EP0108074A1 (de
Inventor
Richard J Mcclure
John F Bagby
Frederick J Jeffers
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
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Publication of EP0108074A1 publication Critical patent/EP0108074A1/de
Publication of EP0108074A4 publication Critical patent/EP0108074A4/de
Withdrawn legal-status Critical Current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
    • G11B5/127—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
    • 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
    • G11B5/1875—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers
    • G11B5/1877—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film
    • G11B5/1878—"Composite" pole pieces, i.e. poles composed in some parts of magnetic particles and in some other parts of magnetic metal layers including at least one magnetic thin film disposed immediately adjacent to the transducing gap, e.g. "Metal-In-Gap" structure
    • 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
    • G11B5/232—Manufacture of gap

Definitions

  • Fig. 7 is a diagram useful in describing the invention.
  • a high energy recording medium which the assignee hereof has employed has a typical coercivity of 850 oersteds, a saturation magnetization of 1600 gauss, a permeability of about two, a nominal 90 percent of saturation remanence that occurs for an applied field H of about 1375 oersteds, and a nominal 10 percent of saturation remanence that occurs for an applied field of about 500 oersteds.
  • FIG. 2 shows a magnetic head comprised of a « 5 ferrite core 10 having a non-magnetic transducer gap 12 defined by Sendust pole pieces 14 bonded at 16 to the ferrite core 10.
  • a magnetic head constitutes a compromise at best: relatively high permeability and eddy-current limiting is provided by the ferrite core 10; and high satura ⁇ tion magnetization is provided by the Sendust pole pieces 14 at relatively little sacrifice in overall permeability.
  • the general concept of the invention is to coat at least the trailing pole face of a pair of ferrite pole faces, which define a transducer gap, with high-saturation material such as Sendust.
  • Fig. 3 which is similar to Fig. 1 but shows the existence of (sputtered) coatings 18 of Sendust on both ferrite pole parts 20.
  • the coatings are between about 0.25 and 2.0 microns thick, the showing of Fig. 3 being clearly not to scale. Notwithstanding this intentional mis-showing (for ease of comparison with Fig.
  • Beilby layer is removed, for example, by ion milling away several microns of the ferrite pole face part prior to the sputtering procedure.
  • a non-magnetic gap spacer material 36 e.g. SiO
  • Sendust-coated chamfered half-bar 37 is brought into face-to-face relationship with the first half-bar (39).

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Magnetic Heads (AREA)
EP19830901054 1982-05-04 1983-02-25 Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung. Withdrawn EP0108074A4 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US37466582A 1982-05-04 1982-05-04
US374665 1982-05-04

Publications (2)

Publication Number Publication Date
EP0108074A1 EP0108074A1 (de) 1984-05-16
EP0108074A4 true EP0108074A4 (de) 1984-10-29

Family

ID=23477719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19830901054 Withdrawn EP0108074A4 (de) 1982-05-04 1983-02-25 Magnetkopf mit hoch sättigungsfähiger spaltenverkleidung.

Country Status (2)

Country Link
EP (1) EP0108074A4 (de)
WO (1) WO1983003918A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL8400140A (nl) * 1984-01-17 1985-08-16 Philips Nv Magneetkop.
NL8401116A (nl) * 1984-04-09 1985-11-01 Philips Nv Magnetische leeskop met een meervoudige spleet.
JPH0770020B2 (ja) * 1985-06-14 1995-07-31 株式会社日立製作所 磁気ヘツド
DE3769301D1 (de) * 1986-12-03 1991-05-16 Philips Nv Magnetkopf mit einem elektro-chemisch inerten spalt aus hartem material.
US5195004A (en) * 1987-07-14 1993-03-16 Sanyo Electric Co., Ltd. Method of manufacturing a magnetic core half
JP2781849B2 (ja) * 1987-07-14 1998-07-30 三洋電機株式会社 磁気ヘッド及びその製造方法
US5278716A (en) * 1987-07-14 1994-01-11 Sanyo Electric Co. Magnetic head with suppressed generation of pseudogap

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH332872A (de) * 1954-02-27 1958-09-30 Luxor Industri Ab Magnetkopf mit einem Kern aus Ferrit
DE2634156A1 (de) * 1975-07-29 1977-02-03 Olympus Optical Co Verfahren zum herstellen von magnetkoepfen
US4241367A (en) * 1978-03-03 1980-12-23 Matsushita Electric Industrial Co., Ltd. Thin film magnetic head

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5347811A (en) * 1976-10-12 1978-04-28 Matsushita Electric Ind Co Ltd Magnetic head
JPS543517A (en) * 1977-06-09 1979-01-11 Sony Corp Erasing head
JPS5558824A (en) * 1978-10-24 1980-05-01 Sanyo Electric Co Ltd Magnetic head
US4302790B1 (en) * 1979-04-11 1999-06-08 Eastman Kodak Co Magnetic recording head with effective magnetic gap length less than about 15mu inches
JPS55157121A (en) * 1979-05-19 1980-12-06 Nippon Telegr & Teleph Corp <Ntt> Magnetic head core
JPS563424A (en) * 1979-06-19 1981-01-14 Hitachi Ltd Magnetic head
JPS5764324A (en) * 1980-10-06 1982-04-19 Hitachi Ltd Magnetic head and its manufacture

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH332872A (de) * 1954-02-27 1958-09-30 Luxor Industri Ab Magnetkopf mit einem Kern aus Ferrit
DE2634156A1 (de) * 1975-07-29 1977-02-03 Olympus Optical Co Verfahren zum herstellen von magnetkoepfen
US4241367A (en) * 1978-03-03 1980-12-23 Matsushita Electric Industrial Co., Ltd. Thin film magnetic head

Non-Patent Citations (15)

* Cited by examiner, † Cited by third party
Title
1978 DIGESTS OF THE INTERMAG CONFERENCE, 9th-12th May 1978, Florence, page 7-4, IEEE, New York, US; F. KOBAYASHI et al.: "A high sensitivity video head developed for VHS player" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 12, no. 12, May 1970, page 2321, New York, US; W. NYSTROM: "Hybrid ferrite head for high-density recording" *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 18, no. 5, October 1975, page 1311, New York, US; M.A. GRIMM: "Ferrite treatment" *
PATENT ABSTRACTS OF JAPAN, vol. 2, no. 84, 8th July 1978, page 3545 E 78; & JP-A-53 047 811 (MATSUSHITA DENKI SANGYO K.K.) 28-04-1978 *
PATENT ABSTRACTS OF JAPAN, vol. 4, no. 100 (P-19)[582], 8th July 1980, page 78 P 19; & JP-A-55 058 824 (SANYO DENKI K.K.) 01-05-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 36 (P-51)[708], 7th March 1981; & JP-A-55 157 121 (NIPPON DENSHIN DENWA KOSHA) 06-12-1980 *
PATENT ABSTRACTS OF JAPAN, vol. 5, no. 48 (P-55)[720], 7th April 1981; & JP-A-56 003 424 (HITACHI SEISAKUSHO K.K.) 14-01-1981 *
PATENT ABSTRACTS OF JAPAN, vol. 6, no. 145 (P-132)[1023], 4th August 1982; & JP-A-57 064 324 (HITACHI SEISAKUSHO K.K.) 19-04-1982 (Cat. A) *
PATENTS ABSTRACTS OF JAPAN, vol. 2, no. 84, 8th July 1978, page 3545 E 78; & JP - A - 53 47 811 (MATSUSHITA DENKI SANGYO K.K.) 28-04-1978 *
PATENTS ABSTRACTS OF JAPAN, vol. 4, no. 100 (P-19)[582], 8th July 1980, page 78 P 19; & JP - A - 55 58 824 (SANYO DENKI K.K.) 01-05-1980 *
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 36 (P-51)[708], 7th March 1981; & JP - A - 55 157 121 (NIPPON DENSHIN DENWA KOSHA) 06-12-1980 *
PATENTS ABSTRACTS OF JAPAN, vol. 5, no. 48 (P-55)[720], 7th April 1981; & JP - A - 56 3424 (HITACHI SEISAKUSHO K.K.) 14-01-1981 *
PATENTS ABSTRACTS OF JAPAN, vol. 6, no. 145 (P-132)[1023], 4th August 1982; & JP - A - 57 64 324 (HITACHI SEISAKUSHO K.K.) 19-04-1982 (Cat. A) *
RESEARCH DISCLOSURE, no. 225, January 1983, page 17, disclosure no. 22511, Havant, Hampshire, GB; "Magnetic head having highly saturable gap liner" *
See also references of WO8303918A1 *

Also Published As

Publication number Publication date
WO1983003918A1 (en) 1983-11-10
EP0108074A1 (de) 1984-05-16

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): DE FR GB NL

17P Request for examination filed

Effective date: 19840421

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19850422

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BAGBY, JOHN F.

Inventor name: MCCLURE, RICHARD J.

Inventor name: JEFFERS, FREDERICK J.