US3668668A - Transducing head mount apparatus - Google Patents

Transducing head mount apparatus Download PDF

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Publication number
US3668668A
US3668668A US95778A US3668668DA US3668668A US 3668668 A US3668668 A US 3668668A US 95778 A US95778 A US 95778A US 3668668D A US3668668D A US 3668668DA US 3668668 A US3668668 A US 3668668A
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US
United States
Prior art keywords
open frame
transducer
members
portions
planar
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 - Lifetime
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US95778A
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English (en)
Inventor
George Conrad Robitschek
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RCA Corp
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RCA Corp
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Publication date
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Application granted granted Critical
Publication of US3668668A publication Critical patent/US3668668A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • ABSTRACT An arrangement is disclosed for supporting a transducer head on an air bearing.
  • the system includes a planar three point resilient suspension system.
  • the suspension system when acted upon by the air bearing deflects to form a parallelogram support for the transducer which provides desired mobility of the transducer.
  • SHEET 2 or 3 Jm/ew for: 650/765 61 flaw/waif AYfarliay TRANSDUCING HEAD MOUNT APPARATUS This invention relates to apparatus for supporting a signal transducer with respect to a recording medium, and is especially useful where there is relative motion between the transducer and the recording medium.
  • the apparatus to which this invention relates is particularly, although not exclusively, adapted for use in combination with tape, drum or disc magnetic recorder-reproducer systems used as memory storage devices in computing machines and the like.
  • transducers supports have been devised using gimbals or multiple springs arranged in separate planes.
  • the gimbal apparatus may be of a conventional pivotal type or a planar spring having orthogonally arranged portions. This permits movement of the transducer about axes both parallel and perpendicular to the direction of relative motion of the transducer and record medium. While it is desirable to allow motion of the transducer with respect to the recording surface to permit the transducer to conform to the air bearing, this motion should be selective. That is, rotation of the transducer should be permitted about an axis which is in the direction of relative motion with the recording surface.
  • a three point planar spring suspension is provided to mount the transducer such that it remains parallel to its initial position. That is, the flat spring elements which mount the head are three parallel arms that form a true parallelogram suspension, in which the arms remain parallel to one another as the head rides along the bearing. While the head can tilt or rotate about an axis through the transducer which is in the direction of relative motion of the transducer and recording surface, this axis remains parallel to the recording surface or tangent thereof and aligned with the recorded information track.
  • FIG. la and b are a plan view and side elevation view respectively of a portion of the transducer suspension arrangement of the invention.
  • FIG. 2 is a comprehensive perspective view of the support system for a transducer according to the invention.
  • FIG. 3 is a side elevation view of the support arrangement of FIG. 2 showing the transducer and suspension system in operative relation with a fluid bearing formed by the movement of an adjacent recording medium.
  • FIGS. 1a and b there is shown a three point suspension assembly 2.
  • the suspension assembly 2 has a plurality of interconnected portions which lie in a common plane in the absence of a stressing force at an angle to the common plane.
  • the assembly 2 comprises an open frame member 4 surrounding a slotted portion 6 through which a transducer, not shown, may be mounted.
  • the slotted portion 6 is coupled at one end 7, to opposite portions 8 and 10 of the open frame member 4, by elongated web members 12 and 14.
  • the members 12 and 14 are resilient generally Z-shaped elongated webs each having a relatively long central portion 16 and relatively shorter end portions 18 disposed generally transverse to the central portion 16.
  • a third resilient elongated web member 22 extending away from the portion 6 in a direction generally parallel to the central portion of the members 12 and 14, and secured to a further portion 24 of the open frame member 4.
  • the assembly 2 has a planar portion 26, which is disposed substantially normal to the open frame member 4 and is preferably an extension thereof.
  • the portion 26 is utilized in mounting the suspension assembly 2 to further portions of a comprehensive support structure as hereinafter shown and described.
  • the axes indicated as 28 and 30 indicate a preferred orientation of the assembly 2 with respect to a relatively moving record medium.
  • the axis 28 is in the direction of relative movement of a recording medium and the suspension assembly 2, with the axis 30 transverse to such direction.
  • the assembly 2 is preferably fabricated from a single piece of resilient non-magnetic material such as beryllium-copper or plastic.
  • the assembly 2 may be fabricated by etching, stamping or otherwise machining a piece of the described material into the form shown in FIGS. la and 1b.
  • An overall length L of 0.337 inches, width W of 0.175 inches and thickness T of 0.002 inches for the assembly 2 of FIG. 1 has been found suitable in practicing the invention.
  • the elongated web members l2, l4 and 22 preferably are of the same longitudinal dimension A. For the overall dimensions L, W and T given, a typical dimension A of 0.110 inches is suitable.
  • the width B of the members l2, 14 is typically half or 0.010 inches the width C of the member 22, while the dimension D of the open frame member 4 is typically 0.030 inches.
  • the slotted portion 6 may be approximately 0.160 inches long and 0.050 inches wide with a slot 0.l 15 inches by 0.010 inches.
  • FIG. 2 there is shown a perspective view of a preferred complete transducer support arrangement.
  • the member 32 and 34 form a shroud or enclosure for the transducer head core 36.
  • Each of the members 32 and 34 are affixed at one end to a housing or main support member 38, with their free ends being spaced apart by approximately the width of the suspension assembly 2.
  • the housing 38 is mounted in fixed relative relation with a recording medium by suitable means not shown.
  • the suspension assembly 2 includes an open frame member 4 surrounding a slotted portion 6 which is intercoupled with the frame 4 by the members l2, l4 and 22. As shown in FIG.
  • the external periphery of the frame 4 and angle portion 26 of the assembly 2 are secured to the members 32 and 34. This is accomplished by bonding or means such as a groove, not shown, in the free edges of the members 32 and 34.
  • the end portion of the head core 36 which contains the transducing gap 40 is mounted through the slotted portion 6 of the suspension assembly 2.
  • the gapped end of the head core 36 is captively held in a slot 42 of a pad member 44 and is preferably flush with the end or working surface 46 thereof.
  • the pad 44 which for example may be a non-magnetic ceramic, has its end 47 fixedly secured by known means to the slotted portion 6 of the suspension assembly 2, thereby rendering the portion 6 itself substantially rigid.
  • the axis 28 indicates the preferred direction of movement of a record medium, not shown, past the surface 46 containing the transducer gap 40 of the head core 36, with the axis 30 transverse to that direction.
  • Leads 48 are shown extending to and about the head core 36 for transducing suitable signals.
  • FIG. 3 in which like reference elements correspond with those shown and described with reference to FIGS.1a and b and 2, shows the transducer head 36 and suspension system 2 in operative relation with a fluid bearing indicated generally by the arrows 50.
  • the fluid bearing 50 most commonly an air bearing, is produced by the movement of the recording medium adjacent the pad 44.
  • the recording medium, or tangent thereto if it is a drum 52 is diagrammatically represented by the line with reference character 54.
  • the air bearing exerts a force on the suspension assembly 2.
  • the force which is in the general direction of air bearing arrows 50, is transmitted to the slotted portion 6 through the pad 44 and core 36 which are secured to the slotted portion 6.
  • the slotted portion 6 which is prevented from bending by the attached rigid pad 44, is deflected or translated out of the rest or common plane of the assembly 2 with the portion 6 and working surface 46 remaining substantially parallel to the axis 28.
  • the members 12, 14 and 22 remain secured between the members 4'and 6. However the relatively shorter portions 18 of member 12 and 14 are rotated or twisted in torsion and the extremities of the member 22 are rotated or flexed by the acting force of the air bearing 50.
  • the assembly 2, while being resilient to facilitate the formation of the parallelogram, is chosen andproportioned in length, width and thickness such as that indicated, to prevent buckling or lineal elongation in this stressed condition.
  • the transducer head 36 mounted to this parallelogram type suspension is thereby rendered free to move up and down in the direction of the air bearing 50 and has restrained rotation about the axis 28.
  • transducer head 36 is however prevented from rotating about a transverse axis such as 30, shown for example in end view in FIG. 3. This is due to the fact that, while as indicated the members 12, 14 and 22 form a parallelogram in which the sides are deflectable at their ends, the intermediate portions of the members 12, 14 and 22 do not buckle or change their lineal dimensions.
  • Apparatus for supporting a transducing head comprising:
  • first and second generally Z-shaped elongated resilient web members each having a relatively long central portion and relatively shorter end portions
  • each of said Z-shaped members being coupled to a first end of said first member, the other ends of said Z-shaped members being attached to opposite portions of said open frame, and
  • a third elongated resilient web member extending away from said first member in a direction parallel to the central portions of said first and second members, said third member coupling the other end of said first member to a further portion of said open frame.
  • first member, said open frame and said first, second and third elongated resilient members are relatively thin planar members which form with said open frame a suspension system for a transducer, said suspension system in a first condition thereof having said first member and said elongated members disposed substantially in a common plane with said open frame member, said suspension system assuming a further condition in response to a force applied to said first member, in which said first member is disposed in a further plane parallel to said common plane with the central portion of said elongated resilient members being deflected to form substantially parallel arms intercoupling said first member with the open frame member in said common plane.
  • Apparatus for positioning a transducer with respect to a record medium in response to a fluid bearing formed by the relative movement of the record medium with respect to said transducer in said fluid comprising:
  • said means including first and second generally Z-shaped resilient planar members, each having a relatively long central portion and relatively shorter end portions, one end of each of said Z-shaped members being coupled to a first end of said second member, the other ends of said Z- shaped members being coupled to opposite portions of said open frame, and a third resilient planar member extending away from said second member in a direction parallel to the central portions of said first and second Z- shaped members, said third member coupling the opposite end of said second member to a further portion of said open frame; and

Landscapes

  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
US95778A 1970-12-07 1970-12-07 Transducing head mount apparatus Expired - Lifetime US3668668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US9577870A 1970-12-07 1970-12-07

Publications (1)

Publication Number Publication Date
US3668668A true US3668668A (en) 1972-06-06

Family

ID=22253546

Family Applications (1)

Application Number Title Priority Date Filing Date
US95778A Expired - Lifetime US3668668A (en) 1970-12-07 1970-12-07 Transducing head mount apparatus

Country Status (8)

Country Link
US (1) US3668668A (xx)
JP (1) JPS5128218B1 (xx)
AU (1) AU466548B2 (xx)
CA (1) CA941064A (xx)
FR (1) FR2117509A5 (xx)
GB (1) GB1360075A (xx)
IT (1) IT940467B (xx)
NL (1) NL7116725A (xx)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3931641A (en) * 1974-08-22 1976-01-06 International Business Machines Corporation Transducer suspension mount apparatus
US3994483A (en) * 1974-03-29 1976-11-30 Ebauches S.A. Spring for maintaining in place an electric component and for ensuring its electric contact
US4058843A (en) * 1975-07-03 1977-11-15 Burroughs Corporation Head and gimbal assembly
US4167765A (en) * 1978-07-27 1979-09-11 International Business Machines Corporation Transducer suspension mount apparatus
FR2479480A1 (fr) * 1980-03-31 1981-10-02 Geosource Inc Ressort de geophone ameliore
WO1982004112A1 (en) * 1981-05-19 1982-11-25 Systems Inc Setra Linear motion linkage
EP0093712A1 (en) * 1981-11-16 1983-11-16 Dma Systems Corporation Gimbal assembly for flying magnetic transducer heads
EP0155746A1 (en) * 1984-01-26 1985-09-25 Memorex Corporation Arch flexure for winchester sliders
US4875121A (en) * 1986-05-12 1989-10-17 Hitachi Maxell, Ltd. Magnetic head supporting device
US5079659A (en) * 1990-07-06 1992-01-07 Seagate Technology, Inc. Gimbal for supporting a hydrodynamic air bearing slider
US5115363A (en) * 1990-02-16 1992-05-19 Digital Equipment Corporation Head/gimbal assembly having low stiffness cross band flexure
US5126901A (en) * 1989-06-08 1992-06-30 Tdk Corporation Thin film magnetic head having a narrow upper surface
US5134531A (en) * 1989-06-08 1992-07-28 Tdk Corporation Magnetic head having a slider with a particular surface arrangement
US5446611A (en) * 1990-09-14 1995-08-29 Hutchinson Technology, Inc. Head suspension assembly which includes a load beam element having relief channels
US5461525A (en) * 1990-09-14 1995-10-24 Hutchinson Technology Incorporated Load beam having areas of varying thickness in the spring region formed by varying numbers of lamina
US5530606A (en) * 1993-08-19 1996-06-25 International Business Machines Corporation Low profile head suspension assembly
US6480356B1 (en) * 2000-05-15 2002-11-12 Semtek Innovative Solutions, Inc. Magnetic head transducer spring assembly and method of making same
US9370865B1 (en) * 2012-05-23 2016-06-21 Western Digital Technologies, Inc. Flexure based compliance device for use with an assembly device

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126407A (en) * 1982-08-31 1984-03-21 Rca Corp Holder for a disc record signal pickup stylus
JPS60119606A (ja) * 1983-12-02 1985-06-27 Alps Electric Co Ltd 磁気ヘツド
US5148340A (en) * 1990-04-18 1992-09-15 International Business Machines Corporation Bifurcated air bearing actuator assembly for a disk drive system
JPH08100319A (ja) * 1994-09-29 1996-04-16 Sasaki Hosohaba Orimono Kk 帽子の汗取りテープ

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3055987A (en) * 1959-11-25 1962-09-25 Litton Ind Of California Transducer assembly
US3069667A (en) * 1958-11-26 1962-12-18 Ibm Transducer apparatus
US3593326A (en) * 1968-07-09 1971-07-13 Int Computers Ltd Magnetic head mounting with plural gimbals

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3069667A (en) * 1958-11-26 1962-12-18 Ibm Transducer apparatus
US3055987A (en) * 1959-11-25 1962-09-25 Litton Ind Of California Transducer assembly
US3593326A (en) * 1968-07-09 1971-07-13 Int Computers Ltd Magnetic head mounting with plural gimbals

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3994483A (en) * 1974-03-29 1976-11-30 Ebauches S.A. Spring for maintaining in place an electric component and for ensuring its electric contact
US3931641A (en) * 1974-08-22 1976-01-06 International Business Machines Corporation Transducer suspension mount apparatus
US4058843A (en) * 1975-07-03 1977-11-15 Burroughs Corporation Head and gimbal assembly
US4167765A (en) * 1978-07-27 1979-09-11 International Business Machines Corporation Transducer suspension mount apparatus
FR2479480A1 (fr) * 1980-03-31 1981-10-02 Geosource Inc Ressort de geophone ameliore
WO1982004112A1 (en) * 1981-05-19 1982-11-25 Systems Inc Setra Linear motion linkage
EP0093712A1 (en) * 1981-11-16 1983-11-16 Dma Systems Corporation Gimbal assembly for flying magnetic transducer heads
EP0093712A4 (en) * 1981-11-16 1984-04-06 Dma Systems Corp BALANCING ASSEMBLY FOR FLYING MAGNETIC TRANSDUCTIVE HEADS.
EP0155746A1 (en) * 1984-01-26 1985-09-25 Memorex Corporation Arch flexure for winchester sliders
US4875121A (en) * 1986-05-12 1989-10-17 Hitachi Maxell, Ltd. Magnetic head supporting device
US5126901A (en) * 1989-06-08 1992-06-30 Tdk Corporation Thin film magnetic head having a narrow upper surface
US5134531A (en) * 1989-06-08 1992-07-28 Tdk Corporation Magnetic head having a slider with a particular surface arrangement
US5115363A (en) * 1990-02-16 1992-05-19 Digital Equipment Corporation Head/gimbal assembly having low stiffness cross band flexure
US5079659A (en) * 1990-07-06 1992-01-07 Seagate Technology, Inc. Gimbal for supporting a hydrodynamic air bearing slider
US5446611A (en) * 1990-09-14 1995-08-29 Hutchinson Technology, Inc. Head suspension assembly which includes a load beam element having relief channels
US5461525A (en) * 1990-09-14 1995-10-24 Hutchinson Technology Incorporated Load beam having areas of varying thickness in the spring region formed by varying numbers of lamina
US5530606A (en) * 1993-08-19 1996-06-25 International Business Machines Corporation Low profile head suspension assembly
US6480356B1 (en) * 2000-05-15 2002-11-12 Semtek Innovative Solutions, Inc. Magnetic head transducer spring assembly and method of making same
US9370865B1 (en) * 2012-05-23 2016-06-21 Western Digital Technologies, Inc. Flexure based compliance device for use with an assembly device

Also Published As

Publication number Publication date
AU3604171A (en) 1973-05-31
AU466548B2 (en) 1973-05-31
CA941064A (en) 1974-01-29
DE2159388A1 (de) 1972-06-15
IT940467B (it) 1973-02-10
DE2159388B2 (de) 1975-05-22
JPS5128218B1 (xx) 1976-08-18
FR2117509A5 (xx) 1972-07-21
GB1360075A (en) 1974-07-17
NL7116725A (xx) 1972-06-09

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