WO1998048409A3 - Electro-magnetic coil assembly - Google Patents

Electro-magnetic coil assembly Download PDF

Info

Publication number
WO1998048409A3
WO1998048409A3 PCT/US1998/007370 US9807370W WO9848409A3 WO 1998048409 A3 WO1998048409 A3 WO 1998048409A3 US 9807370 W US9807370 W US 9807370W WO 9848409 A3 WO9848409 A3 WO 9848409A3
Authority
WO
WIPO (PCT)
Prior art keywords
optical
coil
assembly
dielectric substrate
coil assembly
Prior art date
Application number
PCT/US1998/007370
Other languages
French (fr)
Other versions
WO1998048409A2 (en
WO1998048409B1 (en
Inventor
Peter G Bischoff
Chak Man Leung
Original Assignee
Read Rite Corp
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 Read Rite Corp filed Critical Read Rite Corp
Publication of WO1998048409A2 publication Critical patent/WO1998048409A2/en
Publication of WO1998048409A3 publication Critical patent/WO1998048409A3/en
Publication of WO1998048409B1 publication Critical patent/WO1998048409B1/en

Links

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
    • G11B11/10532—Heads
    • G11B11/10534—Heads for recording by magnetising, demagnetising or transfer of magnetisation, by radiation, e.g. for thermomagnetic recording
    • 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
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/10552—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base
    • G11B11/10554—Arrangements of transducers relative to each other, e.g. coupled heads, optical and magnetic head on the same base the transducers being disposed on the same side of the carrier
    • 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
    • G11B11/1055—Disposition or mounting of transducers relative to record carriers
    • G11B11/1058—Flying heads
    • 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
    • G11B5/1278—Structure or manufacture of heads, e.g. inductive specially adapted for magnetisations perpendicular to the surface of the record carrier
    • 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
    • G11B5/17—Construction or disposition of windings

Landscapes

  • Supporting Of Heads In Record-Carrier Devices (AREA)

Abstract

A coil assembly (44) for use in an optical or a magneto-optical data storage system having a slider (37) and an optical assembly (40), includes a dielectric substrate (52). The coil (50) is either bonded to, or formed on the dielectric substrate, and terminates in two bonding pads. In one embodiment the dielectric substrate is flexible and is made of alumina. The coil is surface mounted on the underside of an optical assembly and/or a slider by means of available techniques, such as an adhesive. The coil assembly includes two tooling, alignment and handling holes, and an optical passage (100) defined at the center of the coil for allowing an optical beam to pass through. The coil assembly has compact, low mass, and high vertical magnetic field characteristics, and allows direct overwrite at a low flying height, with precise control of the focal plane of the optical assembly.
PCT/US1998/007370 1997-04-18 1998-04-09 Electro-magnetic coil assembly WO1998048409A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US84400397A 1997-04-18 1997-04-18
US08/844,003 1997-04-18

Publications (3)

Publication Number Publication Date
WO1998048409A2 WO1998048409A2 (en) 1998-10-29
WO1998048409A3 true WO1998048409A3 (en) 1998-12-17
WO1998048409B1 WO1998048409B1 (en) 1999-01-21

Family

ID=25291526

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/007370 WO1998048409A2 (en) 1997-04-18 1998-04-09 Electro-magnetic coil assembly

Country Status (1)

Country Link
WO (1) WO1998048409A2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6922376B1 (en) 1997-10-17 2005-07-26 Sony Corportion Sil magneto-optic transducer having thin film magnetic coil and holded magnetic core
JP2001236670A (en) * 2000-02-18 2001-08-31 Sony Corp Slider for optical head, manufacturing method thereof, and recording/reproducing device
US7289421B2 (en) 2002-10-30 2007-10-30 Lg Electronics Inc. Optical pickup head of optical recording reproducing apparatus, fabrication method thereof, lubricant-coated optical pickup head of optical recording reproducing apparatus and lubricant coating method thereof

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890178A (en) * 1987-04-10 1989-12-26 Fujitsu Limited Magnetic bias coil for a magneto-optical recording apparatus
US5022018A (en) * 1989-02-16 1991-06-04 Minnesota Mining And Manufacturing Company System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium
US5072324A (en) * 1990-01-11 1991-12-10 Magnex Corporation Thin film transducer/transformer assembly
US5105408A (en) * 1988-05-12 1992-04-14 Digital Equipment Corporation Optical head with flying lens
US5124961A (en) * 1989-12-28 1992-06-23 Fuji Xerox Co., Ltd. Floating head for use with a recording apparatus of magneto-optical memory device
US5295122A (en) * 1991-07-09 1994-03-15 Fuji Xerox Co., Ltd. Flying head of a magneto-optical recording apparatus
US5544131A (en) * 1993-05-14 1996-08-06 Commissariat A L'energie Atomique Magnetic writing head for magneto-optical recording with thick protective coating
US5615183A (en) * 1993-04-14 1997-03-25 Canon Kabushiki Kaisha Magnetic head used in magnetooptical recording
US5617378A (en) * 1990-01-31 1997-04-01 Sony Corporation Magneto-optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03260936A (en) * 1990-03-09 1991-11-20 Fujitsu Ltd Magneto-optical disk device for magnetic field modulated overwrite
JPH0863824A (en) * 1994-06-14 1996-03-08 Canon Inc Magnetic head for magnetooptical recording, manufacture thereof, and magnetooptical recorder

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4890178A (en) * 1987-04-10 1989-12-26 Fujitsu Limited Magnetic bias coil for a magneto-optical recording apparatus
US5105408A (en) * 1988-05-12 1992-04-14 Digital Equipment Corporation Optical head with flying lens
US5022018A (en) * 1989-02-16 1991-06-04 Minnesota Mining And Manufacturing Company System for applying a perpendicular magnetic field to the illuminated side of a magneto-optic medium
US5124961A (en) * 1989-12-28 1992-06-23 Fuji Xerox Co., Ltd. Floating head for use with a recording apparatus of magneto-optical memory device
US5072324A (en) * 1990-01-11 1991-12-10 Magnex Corporation Thin film transducer/transformer assembly
US5617378A (en) * 1990-01-31 1997-04-01 Sony Corporation Magneto-optical disc system having an objective lens with a numerical aperture related to the thickness of the protective layer
US5295122A (en) * 1991-07-09 1994-03-15 Fuji Xerox Co., Ltd. Flying head of a magneto-optical recording apparatus
US5615183A (en) * 1993-04-14 1997-03-25 Canon Kabushiki Kaisha Magnetic head used in magnetooptical recording
US5544131A (en) * 1993-05-14 1996-08-06 Commissariat A L'energie Atomique Magnetic writing head for magneto-optical recording with thick protective coating

Also Published As

Publication number Publication date
WO1998048409A2 (en) 1998-10-29

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