EP0624305A1 - Ensemble d'interconnexion de tete a bande porteuse - Google Patents

Ensemble d'interconnexion de tete a bande porteuse

Info

Publication number
EP0624305A1
EP0624305A1 EP93900955A EP93900955A EP0624305A1 EP 0624305 A1 EP0624305 A1 EP 0624305A1 EP 93900955 A EP93900955 A EP 93900955A EP 93900955 A EP93900955 A EP 93900955A EP 0624305 A1 EP0624305 A1 EP 0624305A1
Authority
EP
European Patent Office
Prior art keywords
suspension
carrier strip
electrically conductive
interconnect
conductor
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Withdrawn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
EP93900955A
Other languages
German (de)
English (en)
Other versions
EP0624305A4 (en
Inventor
Jeffry S. Bennin
Kevin Bjork
Todd W. Boucher
James H. Dettman
Michael T. Hofflander
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.)
Hutchinson Technology Inc
Original Assignee
Hutchinson 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 Hutchinson Technology Inc filed Critical Hutchinson Technology Inc
Publication of EP0624305A1 publication Critical patent/EP0624305A1/fr
Publication of EP0624305A4 publication Critical patent/EP0624305A4/en
Withdrawn legal-status Critical Current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
    • G11B5/48—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
    • G11B5/486—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 with provision for mounting or arranging electrical conducting means or circuits on or along the arm assembly
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/11—Printed elements for providing electric connections to or between printed circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K3/00—Apparatus or processes for manufacturing printed circuits
    • H05K3/10—Apparatus or processes for manufacturing printed circuits in which conductive material is applied to the insulating support in such a manner as to form the desired conductive pattern

Definitions

  • a slider (or head) is flown above a spinning storage disk. Attached to the slider is a read/write transducer which transforms electrical pulses to small magnetic fields which are stored on the disk. The order of the magnetic fields and their subsequent orientation, aligned along the circumference of the disk in north-south configuration, defines a bit code capable of detection as the slider flies over the disk.
  • the sliders are held in place above the disk by a metal spring structure known in the industry as a suspension.
  • This suspension attaches to a rigid arm manipulated by a linear or rotary motion actuator designed to locate the slider at any radial position above the disk.
  • the spinning disk coupled with the actuator movement serves to gain access to multiple tracks across the disk surface, each capable of containing stored data for later retrieval.
  • This invention pertains to the interconnecting device spanning the suspension, from the slider transducer to the printed flexible circuit mating with or containing the signal processing devices.
  • limitations of the current interconnecting devices increases the potential for read/write errors and imposes ceilings on data storage density.
  • Prior art portrays heavy reliance upon the use of small insulated copper wires (44 A G or smaller diameter) threaded into PTFE tubing (0.25 mm - 0.38 mm. in diameter) . Enclosing the insulated copper wires within the tubing provides protection from potentially damaging vibrational contact with the suspension member.
  • the PTFE tube typically extends from the suspension tip along the side or central rails, top or bottom surface of the suspension, to the base plate region and beyond. To avoid reducing the dynamic performance and flight characteristics of the slider, only the fine wires are routed past the suspension out to the slider bond sites.
  • references to the use of the tube and wire interconnect include U.S. Patents Nos. 5,012,368, 4,853,811, 4,991,045.
  • a third representation of prior art involves the utilization of plastic compounds either complementing the function of (such as a thin film overlay) or comprising an integral element of the suspension structure.
  • the conductive wires of the interconnect can either be heat staked or molded into plastic structure providing advantages of low profile, favorable dynamic response, and protective attachment to the suspension.
  • U.S. patent 4,991,045 details such a composite suspension design, while U.S. patents 5,006,946 and 5,001,583 detail conductors contained within or upon polymeric resinous (plastic) materials.
  • the invention of interest defines a head interconnect assembly comprised of conductive elements such as parallel or twisted wire(s) of 44 A G fixedly attached to prepatterned film carrier.
  • the conductors are routed down the carrier strip matching a predetermined orientation and placement. Conductor routing matches the pattern required to mate with the suspension member without manual manipulation during assembly.
  • the conductors are fixedly spaced with the option of having the insulative coating stripped, to match multiple bonding pad placement and orientation.
  • the carrier strip shall contain patterned features defining open regions of accommodation for the suspension and appendages of support for the mating conductors as well as provision for mechanized tooling and assembly.
  • the appendages extending outward into the open regions of the carrier strip shall define the bonding sites of the conductors to the carrier.
  • the conductor support appendages are separated from the main body of the strip leaving only those elements essential to the protection, support, and attachment of the interconnect to the suspension.
  • the interconnect shall be attached to the suspension via adhesive, mechanical fastening, or thermoplastic reflow bond.
  • FIG. 1 is a perspective view of a conventional magnetic head suspension assembly
  • FIG. 2 is a perspective view of the preferred embodiment showing a head suspension assembly with carrier strip interconnect attached prior to final assembly step;
  • FIG. 3 is an exploded view of the preferred embodiment 3 showing the conductive interconnect, carrier strip, and suspension;
  • FIG. 4 is a detail of the slider mount end of the suspension showing the spaced leads of the conductive interconnect as defined within the carrier strip;
  • FIG. 5 is a cross-sectional view of FIG. 2 showing a bond interface of the conductive interconnect with the suspension.
  • FIG. 1 shows a conventional magnetic suspension assembly.
  • the assembly includes a slider, or a transducer head 12 which is electrically connected by fine insulated wires 14 routed through a pol tetrafluoroethylene (PTFE) tube 16 held to suspension 18 by wire captures 20 and center tang 22.
  • PTFE pol tetrafluoroethylene
  • FIG. 1 shows a conventional magnetic suspension assembly.
  • the assembly includes a slider, or a transducer head 12 which is electrically connected by fine insulated wires 14 routed through a pol tetrafluoroethylene (PTFE) tube 16 held to suspension 18 by wire captures 20 and center tang 22.
  • PTFE pol tetrafluoroethylene
  • FIG. 2 through 6 portrays a prepatterned film carrier strip 50 with conductor elements 52 and magnetic head suspension assembly 54 attached.
  • the preferred embodiment of the invention aims to improve upon all of these problems through the predictable and orientated attachment of conductive wire elements 52 to a supporting film carrier strip 50.
  • the orientation of the conductive wire elements as attached to the film carrier strip matches that required for routing upon the magnetic head suspension 54, thus alleviating manual positioning and routing.
  • the service loop (bias reducing loop of unrestrained conductors near the head) of the embodied invention improves upon prior art through the controlled length and geometry of the conductive elements within the loop region.
  • the wire capturing features upon the suspension can be eliminated resulting in a lower profile head suspension assembly upon excision or complete removal of the film carrier strip.
  • the bulk of the film carrier strip itself with suspension assembly and electrical interconnect attached can provide handling and structural support during assembly operations which also provides protection from damage.
  • the prepatterned film carrier strip 50 can be comprised of a metal or plastic material such as PET polyester like MylarSTM of E.I. DuPont de
  • the conductor elements 52 can be insulated wire, twisted or parallel such as 44 AWG diameter (or smaller) oxygen free, high conductivity copper wire with 1.7 micrometers gold plating, insulated with 5 micrometers polyurethane such as that produced by Molecu Wire of Farmingdale, New Jersey.
  • FIG. 3 portrays the patterned film carrier strip 50 including central void region 56 accommodating the attachment of the head suspension assembly 54, a fixturing tab 58, for accommodating electrical hook-up and test fixturing and 60. for positioning the conductor elements 52 during the head bonding operation.
  • tooling reference features 62 within film carrier strip serve to reference conductor elements 52 and suspension assembly 54 to film carrier strip 50 and, in turn, one another.
  • Patterned appendages 64 extending from the bulk of the carrier strip 50 within the central void region 56 serve as bonding sites for the conductor elements and the suspension assembly.
  • the conductive interconnect 52 could be attached to either left or right side, down the center, and upon the top or bottom surface of the suspension assembly 54.
  • the embodiment shown in FIG. 5 shows the film carrier strip appendage 64 in intermediate relationship between the conductive elements 52 and the suspension assembly 54 affixed in a location along the side, top surface.
  • Another embodiment of the invention could portray the conductive elements bonded directly to the suspension assembly. The bond between the suspension assembly 54, film carrier strip appendage 64, and conductor elements 52 portrayed in FIG.
  • thermoplastic material such as the conductor element insulative coating 72 or the thermoplastic film carrier strip appendage 64.
  • the conductors could be attached to the film via an adhesive such as an acrylic, epoxy or cyanoacrylate.
  • the film carrier strip could be bonded to the suspension assembly via adhesive bond with a polyester based adhesive film product such as GTS300 UltraflexSTM by GTS America of Warwick, Rhode Island, or liquid dispensed epoxy or cyanoacrylate adhesives and in another embodiment, the conductors could be attached directly to the head suspension assembly using the previously mentioned adhesives.
  • Removal of the film carrier strip from the head suspension assembly could take place via excision at the appendages 64 leaving a small segment of the appendage material and the conductive elements attached to the suspension assembly or via complete removal of the film carrier strip leaving only the conductive elements attached to the suspension.
  • Appendages near the slider bond site 68 and the electronics bond site 70 also function to secure the conductive elements 52 in fixedly spaced relationship.
  • An embodiment shown in FIG. 4 portrays an appendage 68 near the slider bond site utilizing the material thickness of the film carrier strip 50 as the element defining the conductive element spacing. Additional methods of fixedly spacing the conductive elements could also be employed such as patterned features within the film carrier strip, cured adhesive globules, pins or spacers attached to the film carrier strip, or insulation thicknesses and wire coatings.
  • Crease or cut features 66 portray locations of structural stiffness reduction of the film carrier strip 50 for the expressed purpose of accommodating the bend of an unloaded head suspension assembly 54 and placement of the conductive elements 52 in close proximity to the slider bond sites 78.
  • the invention though portrayed with two conductive elements 52, could accommodate multiple conductors such as required to satisfy the multi- wire (3 to 6 or more) needs of magneto-resistive heads.
  • Usage as portrayed with more than one suspension assembly, can be utilized with assorted Winchester flexure and Whitney suspension mechanism designs, and consistent location of patterned tooling features 62 from one head suspension assembly to another allows consistent handling equipment between head suspension assembly types.
  • the presently disclosed carrier strip head interconnect is particularly useful in the following areas.
  • the conductive wire leads provide means of electrical signal transfer between read/write transducer (head) and amplifier electronics.
  • Using adhesive/thermoplastic for bonding the interconnect to the suspension secures the interconnect to the suspension, while avoiding internal stresses to the suspension during wire crimping and providing variable bond surface area, count and location.
  • the conductor design elements provide multiple twists per linear inch, various conductor insulating coatings, various conductor metallurgies and platings, multiple conductors per interconnect and allow twisted or parallel conductor format.
  • the spaced conductor design provides options for multiple spacing widths of fixed leads, strip lengths and locations of fixed leads, parallel and angular conductor routing at the head relative to one another.
  • the spaced conductors at the bond sites provide means of matching conductive pad spacings on the head and on the electronics, attachment to the head with limited or no manual positioning of the conductors, attachment to the electronics without manual positioning of the conductors, accommodating su -assembly electrical test probe access, accommodating variable conductor count per interconnect, and positioning of multiple leads in a single operation or locating step.
  • the fixed length service loop allows reduced variation in static bias, and allows positioning a service loop on the "left" or "right” side as well as straight out over the nose of the suspension.
  • the conductive leads secured to the plastic carrier strip provide novelty in the following features. Consistent interconnect routing is provided along the X and Y (horizontal) and Z (vertical) axes of the suspension assembly.
  • the interconnect support during shipping and handling avoids damaging contact with the conductors (bends) and allows damage-free multi-axis rotation of the conductors.
  • the plastic film carrier strip defines alignment between the interconnect and the suspension during assembly.
  • the carrier strip can aid in avoiding conductor contact with sharp metal edges of the suspension by functioning as an intermediate substrate.
  • the carrier strip permits securing variable conductor lengths at the electronics end, and facilitates conductor positioning and electrical test by providing a placement tab at the electronics end. Particulate entrapment within pocketed cavities (such as the tube) is avoided. Particulate generation is avoided by eliminating the wire crimping operation. Improved consistency in static bias is achieved through repeatable interconnect routing along the suspension. Installation bias is reduced by elimination of manual interconnect routing and fixing to the suspension.
  • Static bias to the suspension is reduced by reducing the interconnect structure (i.e., tube elimination) in the radius bend area of the suspension and preforming the interconnect and the carrier strip to match pre ⁇ loaded position prior to application to the suspension.
  • the outrigger carrier strip format reduces the chance of thermal mismatch between the suspension and the carrier by reducing contact area attached to the suspension.
  • the interconnect/suspension and the HGA assembly are automatable due to tooling and reference features on the carrier strip.
  • the strip format is conducive to line processing. The "left" and "right", and the top and bottom attachment of the interconnect to the suspension is facilitated. Manipulation of the carrier strip holding the suspension facilitates handling, holding and manipulating the suspension without actually holding the suspension itself, reducing potential for handling damage and/or contamination.
  • the presently disclosed carrier strip head interconnect improves upon the prior art in the following ways.
  • the carrier strip allows the elimination of manual lead positioning during bonding at slide and electronic bond sites. Manual routing of the interconnect along the suspension is also avoided.
  • the wire crimping operation is eliminated, which in turn, eliminates induced stress to the suspension, lowers the require_! profile of the suspension and reduces labor required for the assembly. Eliminating the need for the containment tube lowers the required profile of the suspension and reduces the mass of the interconnect assembly.

Landscapes

  • Supporting Of Heads In Record-Carrier Devices (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)

Abstract

Un ensemble d'interconnexion de tête électrique est conçu pour être installé sur l'élément de suspension supportant une tête magnétique de lecture/enregistrement au-dessus d'un disque d'enregistrement rotatif d'un entraînement de disque magnétique. Une interconnexion se compose d'une bande porte-film (50) sur laquelle des éléments conducteurs (52) sont positionnés et liés. Les éléments conducteurs (52) sont acheminés le long d'une bande porteuse préconfigurée définissant le positionnement des coordonnées X, Y et Z nécessaire pour se solidariser à l'élément de suspension (54) sans roulage ou manipulation manuels. Les éléments conducteurs sont espacés de manière fixe avec une isolation en bande aux deux points terminaux de l'interconnexion (électronique et tête) permettant une liaison prépositionnée, automatique aux plots de connexion. Un élément de suspension (54) positionné et lié à l'intérieur de la bande au niveau de sites annexes termine l'installation des éléments conducteurs (52) sur la suspension. Le support sert ensuite à fixer les conducteurs et la suspension dans le cadre protecteur de la bande et produit des références d'outillage (62) configurées jusqu'à ce qu'on le sectionne après avoir terminé l'assemblage de la suspension.
EP93900955A 1992-01-28 1992-12-08 Carrier strip head interconnect assembly. Withdrawn EP0624305A4 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US80840692A 1992-01-28 1992-01-28
PCT/US1992/010607 WO1993015593A1 (fr) 1992-01-28 1992-12-08 Ensemble d'interconnexion de tete a bande porteuse
US808406 2001-03-14

Publications (2)

Publication Number Publication Date
EP0624305A1 true EP0624305A1 (fr) 1994-11-17
EP0624305A4 EP0624305A4 (en) 1995-12-13

Family

ID=25198671

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93900955A Withdrawn EP0624305A4 (en) 1992-01-28 1992-12-08 Carrier strip head interconnect assembly.

Country Status (3)

Country Link
EP (1) EP0624305A4 (fr)
JP (1) JP2592773B2 (fr)
WO (1) WO1993015593A1 (fr)

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1995013609A1 (fr) * 1993-11-12 1995-05-18 Conner Peripherals, Inc. Support de fil metallique pour unite de disque
JP2955829B2 (ja) 1994-04-15 1999-10-04 ハッチンソン テクノロジー インコーポレイテッド ヘッドサスペンション
US5491597A (en) * 1994-04-15 1996-02-13 Hutchinson Technology Incorporated Gimbal flexure and electrical interconnect assembly
US5598307A (en) * 1994-04-15 1997-01-28 Hutchinson Technology Inc. Integrated gimbal suspension assembly
US5835306A (en) * 1995-06-07 1998-11-10 Hutchinson Technology Incorporated Integrated gimbal suspension assembly with assymetric bond pad
EP0767450A3 (fr) * 1995-10-06 1998-01-07 W.L. GORE & ASSOCIATES, INC. Interconnecteur tête/pré-amplifier en forme de ruban pour appareil à mémoire de données
US5883759A (en) * 1996-02-22 1999-03-16 Seagate Technology, Inc. Flex circuit head interconnect for improved electrical performance and ease of assembly
US5810094A (en) * 1996-05-09 1998-09-22 W. L. Gore & Associates, Inc. Head/pre-amp ribbon interconnect for data storage devices
US6147839A (en) * 1996-12-23 2000-11-14 Hutchinson Technology, Inc. Head suspension with outriggers extending across a spring region
JP2001143409A (ja) 1999-11-17 2001-05-25 Tdk Corp 磁気ヘッドアセンブリ、その製造方法および磁気ヘッドアセンブリにおける配線方法

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520555A (en) * 1982-09-27 1985-06-04 Magnetic Information Technology, Inc. Apparatus and method for aligning and assembly of a gimbal, magnetic slider head, and flexure arm
US4616279A (en) * 1983-05-19 1986-10-07 Hewlett Packard Company Electrical connections for thin film transducer heads
US4823217A (en) * 1984-07-05 1989-04-18 Canon Denshi Kabushiki Kaisha Circuiting device

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US3195079A (en) * 1963-10-07 1965-07-13 Burton Silverplating Built up nonmetallic wave guide having metallic coating extending into corner joint and method of making same
US4645280A (en) * 1985-08-08 1987-02-24 Rogers Corporation Solderless connection technique between data/servo flex circuits and magnetic disc heads
US4819094A (en) * 1986-08-12 1989-04-04 Oberg Gary R Damped magnetic head suspension assembly
US4853811A (en) * 1987-08-03 1989-08-01 International Business Machines Corporation Magnetic disk drive with low profile head-suspension system
US4991045A (en) * 1987-12-21 1991-02-05 Hutchinson Technology, Inc. Suspension assembly
EP0344366B1 (fr) * 1988-04-29 1992-04-15 International Business Machines Corporation Support de tête magnétique et mécanisme d'accès pour unité de disques
US5001589A (en) * 1989-05-31 1991-03-19 Seagate Technology, Inc. Tungsten and tantalum diffusion barriers for Metal-In-Gap magnetic heads
US5121273A (en) * 1990-04-12 1992-06-09 Micropolis Corporation Computer disk head interconnect assembly
US5060956A (en) * 1990-05-17 1991-10-29 Glass Philip E Lawn game

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4520555A (en) * 1982-09-27 1985-06-04 Magnetic Information Technology, Inc. Apparatus and method for aligning and assembly of a gimbal, magnetic slider head, and flexure arm
US4616279A (en) * 1983-05-19 1986-10-07 Hewlett Packard Company Electrical connections for thin film transducer heads
US4823217A (en) * 1984-07-05 1989-04-18 Canon Denshi Kabushiki Kaisha Circuiting device

Non-Patent Citations (3)

* Cited by examiner, † Cited by third party
Title
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 26, no. 12, May 1984 NEW YORK US, pages 6255-6256, K.C. JONES 'FLEXIBLE CABLE/COIL ASSEMBLY FOR A FLOPPY DISK DRIVE HEAD ACCESS ARM' *
IBM TECHNICAL DISCLOSURE BULLETIN, vol. 33, no. 3A, August 1990 NEW YORK US, pages 252-257, XP 000123926 'ASSEMBLY FIXTURE FOR MAGNETIC READ/WRITE HEAD SUSPENSION ASSEMBLIES' *
See also references of WO9315593A1 *

Also Published As

Publication number Publication date
EP0624305A4 (en) 1995-12-13
JP2592773B2 (ja) 1997-03-19
WO1993015593A1 (fr) 1993-08-05
JPH07502855A (ja) 1995-03-23

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