WO1999005673A1 - Cardan ameliore pour tete de lecteur de disque - Google Patents

Cardan ameliore pour tete de lecteur de disque Download PDF

Info

Publication number
WO1999005673A1
WO1999005673A1 PCT/US1998/008175 US9808175W WO9905673A1 WO 1999005673 A1 WO1999005673 A1 WO 1999005673A1 US 9808175 W US9808175 W US 9808175W WO 9905673 A1 WO9905673 A1 WO 9905673A1
Authority
WO
WIPO (PCT)
Prior art keywords
slider
flexure arms
mounting tab
gimbal spring
relative
Prior art date
Application number
PCT/US1998/008175
Other languages
English (en)
Inventor
Richard A. Budde
Original Assignee
Seagate Technology, Inc.
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, Inc. filed Critical Seagate Technology, Inc.
Publication of WO1999005673A1 publication Critical patent/WO1999005673A1/fr

Links

Classifications

    • 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
    • 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
    • G11B5/4806—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 specially adapted for disk drive assemblies, e.g. assembly prior to operation, hard or flexible disk drives
    • G11B5/4826—Mounting, aligning or attachment of the transducer head relative to the arm assembly, e.g. slider holding members, gimbals, adhesive
    • 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
    • G11B7/085—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam into, or out of, its operative position or across tracks, otherwise than during the transducing operation, e.g. for adjustment or preliminary positioning or track change or selection
    • G11B7/0857—Arrangements for mechanically moving the whole head
    • G11B7/08576—Swinging-arm positioners
    • 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
    • G11B7/0925—Electromechanical actuators for lens positioning
    • G11B7/0932—Details of sprung supports
    • 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
    • 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

Definitions

  • the present invention relates to a disc drive assembly.
  • the present invention relates to an improved suspension design for supporting a head relative
  • Disc drive systems which read data from a disc surface during
  • Such disc drive systems include conventional magnetic disc drives and optical disc drive systems.
  • Optical disc drive systems operate by focusing a laser beam onto a disc surface via an optical assembly which is used to read data from
  • Known optical assemblies include an objective lens and a solid immersion lens
  • the SIL which is positioned between the objective lens and the disc surface.
  • the SIL is
  • the beam is focused onto the SIL using an objective lens.
  • the SIL is preferably carried on a slider and the slider is positioned close to the disc surface. Use of an SIL increases storage density.
  • the slider is generally formed of a transparent material and includes an air
  • the slider includes a leading edge and a trailing edge. Rotation of discs creates a hydrodynamic lifting force under the
  • the slider preferably flies with a positive pitch angle in which the leading edge of the slider flies at a greater distance from the disc surface than the trailing edge via a suspension assembly which includes a load beam and gimbal
  • the slider is coupled to the load beam via the gimbal spring.
  • the load beam applies a load force to the slider via a load button.
  • the load button defines an axis about which the slider pitches and rolls via the gimbal spring.
  • the slider is preferably resilient in the pitch and roll direction to enable the slider to follow the topography of the disc.
  • the flexure of the gimbal spring permits the air bearing slider to pitch and roll
  • SIL and slider relative to the disc surface to maintain the proper focus of light onto the disc surface as is known for optical disc drive systems. It is important that the flexure system including the load beam and the gimbal spring be designed to stably and
  • M-O magneto optic
  • An actuator mechanism is coupled to the suspension assembly to locate the
  • the input motion or external vibration may be amplified substantially, causing unstable fly characteristics and misalignment of the slider
  • the slider and suspension assembly may cause torsional mode resonance, sway mode resonance, and bending mode resonance.
  • Torsional mode motion relates to rotation or twisting of the suspension assembly about an in-plane axis.
  • Bending mode resonance essentially relates to up-down motion of the suspension assembly relative to the disc surface.
  • Sway mode vibration relates to in-plane
  • the resonance frequency of the suspension assembly is related to the stiffness or elasticity and mass of the suspension system. Thus, it is desirable to design a
  • suspension system for a disc drive More specifically, it is an objective to provide an improved gimbal design which limits resonance which assures stable flying
  • a further object of this invention is to provide an improved gimbal which limits the resonance motion to assure stable flying characteristics for the gimbal. More
  • the objective of the invention is to limit the rotational or twisting motion of the suspension as well as the up-down motion of the suspension relative to the disc
  • the gimbal includes opposed space flexure arms which are formed of elongated members, each having a proximal end and a distal end which define
  • proximal ends of the flexure arms being operably coupled
  • a mounting tab is positioned between
  • Bridge sections are provided which connect the distal ends of the flexure arms to the mounting tab, the bridge sections
  • the bridges are curved to conform to the
  • curvature of an optical lens mounted on the slider to be used to read information from
  • Figure 1 is a schematic illustration of operation of an optical disc drive system.
  • Figure 2 is a side view of a slider supporting an SIL.
  • Figure 3 is a top view of a suspension assembly coupled to an actuator mechanism for supporting a slider relative to a disc surface (not shown).
  • Figure 4 is a cross-sectional view taken along line 4—4 of Figure 3.
  • Figure 1 is a simplified diagram illustrating an optical storage system using
  • Optical system 10 includes an optical disc 12 having a data
  • a slider 20 is movably supported relative to disc surface 12 via an actuator mechanism 22.
  • the slider 20 supports an SIL 24 for focusing a laser beam of an optical
  • the mechanism 22 preferably includes a voice coil motor 26.
  • the slider 20 is coupled to the
  • the optical system includes an optical head 30 which preferably is coupled to the actuator mechanism 22 and operated thereby.
  • the optical head 30 includes a laser beam which is focused onto the disc surface via the
  • Figure 2 illustrates the slider 20 and SIL 24 construction.
  • the slider is formed of a transparent material, such as a cubic zirconia.
  • the SIL 24 is bonded to the slider 20 or, alternatively, the slider 20 and SIL 24 may be formed of an integral material machined from a single piece of crystal.
  • the integrated SIL 24 and slider 20 can be formed by injection molding a single piece of transparent material such as a commercially available polycarbonate in a known manner.
  • the slider 20 includes
  • the slider 20 is supported by a suspension assembly 28 operably coupled to
  • the 28 includes a load beam 36, a mounting plate 38, and a gimbal spring 40.
  • the mounting plate 38 is coupled to the actuator mechanism 22 via stake 42 in a known manner.
  • the load beam 36 is formed of an elongated flexible material which includes
  • load tab 46 having load button 48 (on a lower surface of load tab 46)
  • the gimbal spring 40 is coupled to the load beam 36 and flexibly supports slider 20 relative to the load beam 36.
  • the load button 48 applies a load force to the
  • the lower air bearing surface 34 of the slider 20 (not shown) faces the disc
  • the gimbal spring 40 should be
  • the slider will not be able to follow the topography of the disc surface.
  • the actuator mechanism 22 moves the suspension assembly to position the slider 20 and SIL 24 relative to selected positions on the disc surface.
  • Rotation of the disc supplies a lifting force to the slider 20 at the ABS surface.
  • the suspension assembly and gimbal spring 40 may coincide with the resonance frequencies of the suspension system, causing the external
  • a slider 20 supports an SIL 24 above the disc surface via operation of the ABS surface and the load force of the load beam 36.
  • the weight of the SIL 24 may be unbalanced relative to the load position and during operation may excite the gimbal spring 40.
  • this vibration is amplified at the resonance frequency,
  • the gimbal spring 40 of the present invention is designed to provide desirable pitch and roll stiffness with desired resonance frequency as will be explained. As shown in Figure 3, the slider includes a leading edge 52 and a trailing edge
  • the SIL 24 is positioned toward the trailing edge 54 of the slider
  • the load tab 46 extends from the leading edge 52 along a forward
  • the load tab 46 is sized to extend along the forward portion 58
  • portion 59 of the slider 20 for flight stability of the slider 20 during operation.
  • the suspension assembly illustrated in Figure 3 illustrates an embodiment of
  • a gimbal spring 40 of the present invention for supporting slider 20 designed to optimize pitch and roll stiffness and gimbal resonance characteristics. As shown, the gimbal
  • spring 40 generally includes an elongated mounting portion or base 60, spaced flexure
  • the gimbal spring 40 is cantileveredly
  • Spaced flexure arms 62, 64 are supported by and extend from the mounting portion 60 in spaced cantilevered
  • Slider mounting tab 66 is operably coupled to the flexure arms 62, 64 and is
  • the flexure arms 62, 64 are spaced relative to the width of the slider 20 a certain distance from the centerline 68, and width 70 of each of the flexure arms 62, 64
  • Flexure arms 62, 64 include a proximal end 72 and a distal end
  • the proximal end 72 is coupled to mounting portion 60 and distal end 74 is coupled to mounting tab 66.
  • the proximal end 72 is fixed relative to the load beam 36 and the distal end 74 flexibly supports slider 20 relative to the pivot axis 50.
  • the distal end 74 is cantilevered beyond the pivot axis 50 of slider 20 to provide desired pitch stiffness relative to load button 48 at pivot axis 50. The extent or length of the
  • flexure arms 62, 64 tends to decrease the pitch stiffness based upon the width
  • a portion of the flexure arms extends beyond pivot axis 50 to provide sufficient pitch stiffness for desired fly characteristics.
  • the length of the flexure arms 62, 64 is designed so that when the
  • mounting tab 60 is secured to the load beam 36 and load beam 36 is positioned so that
  • the load button supplies a load force to the center portion 59 of the slider, the distal end 74 extends beyond the pivot axis 50 but does not extend along the entire rear portion 56 to the trailing edge of the slider 20.
  • the shortened length provides increased gimbal
  • the design also provides a reduced width and offset flexure arms 62, 64 having lower roll stiffness.
  • mounting tab 66 couples the distal end 74 of flexure arms 62, 64 to slider 20.
  • placement of mounting tab 66 is
  • the SIL 24 is supported in the rear portion 56, thus interferes with placement of mounting tab 66 in alignment with the distal end 74 of flexure arms 62, 64.
  • flexure arms 62, 64 are coupled to a proximally spaced mounting tab 66 via bridges 76, 78.
  • Bridges 76, 78 extend at a sloped
  • distal end 74 is very critical in providing a pitch stiffness low enough to allow proper flying characteristics.
  • the curved shape of the flexure mounting tabs or bridges 76, 78 is very critical in providing a pitch stiffness low enough to allow proper flying characteristics.
  • the gimbal spring 40 of the present invention is not limited to the shape of the particular mounting tab 66 shown; alternately designed mounting tabs
  • the load button 48 is formed by an etching process.
  • the load button or dimple 48 formed by the etching process requires less surface area to
  • the load button 48 formed by the etching process limits the contact to the slider 20 and provides sufficient surface area to mount the mounting tab 66 and wire termination pads relative to the upper surface 31 of the slider 20.
  • FIG 4 is a cross-sectional view taken along line 4—4 of Figure 3 and illustrates load button 48. As shown, the load button 48 is formed by an etching process
  • curved region 86 (shown in Figure 3) facilitates press forming recessed portion 84 to form and vertically locate extended load button 48.
  • the bridge design of the present invention illustrates the
  • gimbal arms would be on the leading edge side of the load point. It is highly desirable for pitch stiffness to have some length of the gimbal arms on both sides of the load point.
  • the unique feature is the circular shape or edge to the bond pad.
  • the circular shape follows the profile of the objective lens 24 and allows the gimbal arms 62, 64 to be extended past the load point towards the trailing edge of the slider. In Figure 3, if the straight lead

Landscapes

  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Supporting Of Heads In Record-Carrier Devices (AREA)

Abstract

Une partie de montage de base (60) raccorde le ressort de cardan (40) à un fléau de charge (36) et ainsi au dispositif d'actionnement (22) du lecteur de disque qui positionne le cardan (40) et le curseur (20) sur une piste voulue du disque. Le cardan (40) comprend des bras à flexion opposés (62, 64) constitués d'éléments allongés ayant chacun une extrémité proximale et une extrémité distale qui définissent une ouverture entre elles. Les extrémités distales des bras à flexion (62, 64) sont couplées activement à la base (60), et les extrémités distales sont en porte-à-faux. Une patte de fixation (66) est positionnée entre les extrémités des bras à flexion (62, 64) et supporte le curseur (20). Des sections de pont (76, 78) connectent les extrémités distales (74) des bras à flexion (62, 64) à la patte de fixation (66), les sections de pont (76, 78) s'étendant selon un certain angle par rapport aux bras à flexion (62, 64) et reviennent en angle vers la section de base (60) du cardan (40).
PCT/US1998/008175 1997-07-23 1998-04-22 Cardan ameliore pour tete de lecteur de disque WO1999005673A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US5348097P 1997-07-23 1997-07-23
US60/053,480 1997-07-23

Publications (1)

Publication Number Publication Date
WO1999005673A1 true WO1999005673A1 (fr) 1999-02-04

Family

ID=21984566

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1998/008175 WO1999005673A1 (fr) 1997-07-23 1998-04-22 Cardan ameliore pour tete de lecteur de disque

Country Status (1)

Country Link
WO (1) WO1999005673A1 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954919A (en) * 1988-07-25 1990-09-04 Nec Corporation Rotary seek magnetic head assembly having a looped load beam end to achieve high speed access
US5115363A (en) * 1990-02-16 1992-05-19 Digital Equipment Corporation Head/gimbal assembly having low stiffness cross band flexure
US5377064A (en) * 1992-09-07 1994-12-27 Hitachi, Ltd. Structure for supporting a slider with magnetic head for a linear magnetic disk unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954919A (en) * 1988-07-25 1990-09-04 Nec Corporation Rotary seek magnetic head assembly having a looped load beam end to achieve high speed access
US5115363A (en) * 1990-02-16 1992-05-19 Digital Equipment Corporation Head/gimbal assembly having low stiffness cross band flexure
US5377064A (en) * 1992-09-07 1994-12-27 Hitachi, Ltd. Structure for supporting a slider with magnetic head for a linear magnetic disk unit

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