GB2349694B - Method and apparatus to determine fly height of a recording head - Google Patents

Method and apparatus to determine fly height of a recording head

Info

Publication number
GB2349694B
GB2349694B GB0019398A GB0019398A GB2349694B GB 2349694 B GB2349694 B GB 2349694B GB 0019398 A GB0019398 A GB 0019398A GB 0019398 A GB0019398 A GB 0019398A GB 2349694 B GB2349694 B GB 2349694B
Authority
GB
United Kingdom
Prior art keywords
fly height
light
slider
source
disc
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.)
Expired - Fee Related
Application number
GB0019398A
Other versions
GB0019398D0 (en
GB2349694A (en
Inventor
James E Durnin
Edward C Gage
Gregory Stephen Mowry
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.)
Seagate Technology LLC
Original Assignee
Seagate Technology LLC
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 Seagate Technology LLC filed Critical Seagate Technology LLC
Publication of GB0019398D0 publication Critical patent/GB0019398D0/en
Publication of GB2349694A publication Critical patent/GB2349694A/en
Application granted granted Critical
Publication of GB2349694B publication Critical patent/GB2349694B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • 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
    • G11B5/48—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed
    • G11B5/58—Disposition or mounting of heads or head supports relative to record carriers ; arrangements of heads, e.g. for scanning the record carrier to increase the relative speed with provision for moving the head for the purpose of maintaining alignment of the head relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B5/60—Fluid-dynamic spacing of heads from record-carriers
    • G11B5/6005—Specially adapted for spacing from a rotating disc using a fluid cushion
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/122—Flying-type heads, e.g. analogous to Winchester type in magnetic recording
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1387—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector using the near-field effect
    • 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
    • G11B11/10576—Disposition or mounting of transducers relative to record carriers with provision for moving the transducers for maintaining alignment or spacing relative to 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

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)
  • Optical Head (AREA)
  • Instruments For Measurement Of Length By Optical Means (AREA)

Abstract

The invention features a fly height measurement system for measuring fly height of a slider (104) over a storage disc (112). The fly height measuring system includes a source of light (100), a slider (104), a detector module (106) and a processor (108). The source of light (100) produces light along a light path. The slider (104) includes an objective lens positioned such that light from said source hits the objective lens (124) and is directed toward a surface (110) of a disc (112). Light propagating from the disc (112) is directed to a detector (106). The processor (108) estimates the fly height of the slider (104) based on detector module output.
GB0019398A 1998-02-17 1998-09-29 Method and apparatus to determine fly height of a recording head Expired - Fee Related GB2349694B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US7496698P 1998-02-17 1998-02-17
PCT/US1998/020311 WO1999041566A1 (en) 1998-02-17 1998-09-29 Method and apparatus to determine fly height of a recording head

Publications (3)

Publication Number Publication Date
GB0019398D0 GB0019398D0 (en) 2000-09-27
GB2349694A GB2349694A (en) 2000-11-08
GB2349694B true GB2349694B (en) 2002-09-18

Family

ID=22122718

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0019398A Expired - Fee Related GB2349694B (en) 1998-02-17 1998-09-29 Method and apparatus to determine fly height of a recording head

Country Status (6)

Country Link
JP (1) JP2002503801A (en)
KR (1) KR20010041003A (en)
CN (1) CN1146718C (en)
DE (1) DE19882972T1 (en)
GB (1) GB2349694B (en)
WO (1) WO1999041566A1 (en)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100882306B1 (en) 2001-08-31 2009-02-10 소니 가부시끼 가이샤 Optical pickup device and recording/reproducing device
JP4228666B2 (en) 2002-11-25 2009-02-25 ソニー株式会社 Optical pickup device, recording / reproducing device, and gap detection method
US20050094258A1 (en) * 2003-10-31 2005-05-05 Hamamatsu Photonics K.K. Solid immersion lens moving device and microscope using the same
US7505143B2 (en) * 2005-05-17 2009-03-17 Kla-Tencor Corporation Dynamic reference plane compensation
JP5198393B2 (en) * 2009-09-03 2013-05-15 株式会社東芝 Height detection device
JP2016520216A (en) * 2013-05-23 2016-07-11 アプライド マテリアルズ イスラエル リミテッド Evaluation system and method for evaluating a substrate

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5486924A (en) * 1991-10-23 1996-01-23 Phase Metrics Method and apparatus for measurement of roughness and hardness of a surface
US5715060A (en) * 1996-03-11 1998-02-03 Carnegie Mellon University Apparatus and method for measuring linear nanometric distances using evanescent radiation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5486924A (en) * 1991-10-23 1996-01-23 Phase Metrics Method and apparatus for measurement of roughness and hardness of a surface
US5715060A (en) * 1996-03-11 1998-02-03 Carnegie Mellon University Apparatus and method for measuring linear nanometric distances using evanescent radiation

Also Published As

Publication number Publication date
GB0019398D0 (en) 2000-09-27
WO1999041566A1 (en) 1999-08-19
JP2002503801A (en) 2002-02-05
DE19882972T1 (en) 2001-02-01
KR20010041003A (en) 2001-05-15
CN1290339A (en) 2001-04-04
GB2349694A (en) 2000-11-08
CN1146718C (en) 2004-04-21

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20040929