US20060168796A1 - System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an HGA flexure cable - Google Patents

System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an HGA flexure cable Download PDF

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Publication number
US20060168796A1
US20060168796A1 US11/397,162 US39716206A US2006168796A1 US 20060168796 A1 US20060168796 A1 US 20060168796A1 US 39716206 A US39716206 A US 39716206A US 2006168796 A1 US2006168796 A1 US 2006168796A1
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United States
Prior art keywords
voice coil
bonding
flexible circuit
hga
coil carriage
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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.)
Abandoned
Application number
US11/397,162
Inventor
Liu Jun Zhang
Guo Hong Lu
Can Hua Chen
Yiu Sing Ho
Jeffery Wang
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Individual
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Priority to US11/397,162 priority Critical patent/US20060168796A1/en
Publication of US20060168796A1 publication Critical patent/US20060168796A1/en
Abandoned 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
    • G11B5/4806—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
    • 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
    • G11B5/4846—Constructional details of the electrical connection between arm and support
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49025—Making disc drive
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49027—Mounting preformed head/core onto other structure
    • Y10T29/4903—Mounting preformed head/core onto other structure with bonding
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/4902—Electromagnet, transformer or inductor
    • Y10T29/49021—Magnetic recording reproducing transducer [e.g., tape head, core, etc.]
    • Y10T29/49032—Fabricating head structure or component thereof
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/53—Means to assemble or disassemble
    • Y10T29/5313—Means to assemble electrical device
    • Y10T29/53165—Magnetic memory device

Abstract

A system and method are disclosed for improving the electrical connection of a hard drive relay flexible circuit assembly to a head-gimbal assembly (HGA) flexure cable. In one embodiment, a flexible circuit assembly is attached to a hard drive coil carriage via a U-shaped connector and is electrically coupled to the HGA flexure cable by a bonding agent, such as an Anisotropic Conductive Film (ACF).

Description

    BACKGROUND INFORMATION
  • The present invention relates to hard disk drives. More specifically, the invention relates to a system and method for improving the electrical connection of a hard drive relay flexible circuit assembly to a head-gimbal assembly (HGA) flexure cable.
  • FIG. 1 provides an illustration of a typical hard disk drive. Hard disk drive storage devices typically include a rotating disk 1 mounted for rotation by a spindle motor 2. A slider 3, supported by an actuator arm 5, ‘flies’ over the surface of the magnetic disk 1 at a high velocity reading data from and writing data to concentric data tracks on the disk 1. The slider 3 is positioned radially by a voice coil 7 embedded in a voice coil carriage 8.
  • In typical hard disk drives, electrical control signals are communicated to the voice coil 7 by a relay flexible circuit 9. Typically, the relay flexible circuit 9 also communicates read/write data to the slider/head(s) 3. A printed circuit board (PCB) 11 operates to control the position of the arm(s) 5 with head/slider(s) 3 (also known as the head stack assembly (HSA)).
  • FIG. 2 shows a more detailed view of a head stack assembly (HSA) typical in the art. The actuator arm 5 is mounted on the actuator assembly (not shown) and affixed to a pivot member 6. The actuator arms 5 each have a suspension flexure cable (HGA flexure cable) 20 running from the heads/sliders 3 to a plurality connecting pads 19. The connecting pads 19 are electrically coupled to the flexible circuit assembly 9 by bonding (e.g., by solder bump or gold ball bonding 15) the flexure cable connecting pads 19 to a plurality of flexible circuit bonding pads 16.
  • FIG. 3 provides a more detailed illustration of the voice coil actuator assembly as is typical in the art. A relay flexible circuit 9 is aligned upon the coil carriage 8 by an alignment pin 17 protruding from the coil carriage 8 (inserted in a hole in a circuit board 14 terminating the flexible circuit assembly 9). After positioning, the flexible circuit assembly 9 may be electrically coupled to the HGA (not shown), as illustrated in FIGS. 2 and 4.
  • FIG. 4 illustrates electrically coupling the HGA flexure cable connecting pads to flexible circuit bonding pads as is typical in the art. Typically, bonding methods 15, such as solder bump or gold ball bonding, are utilized to electrically couple the HGA flexure cable connecting pads 19 to the flexible circuit bonding pads 16. As stated above, an alignment pin 17 is utilized to position the circuit board 14 of the relay flexible circuit assembly (not shown). As stated above, the circuit board 14 bonding pads 16 are electrically coupled to the flexure cable connecting pads 19 by methods such as solder bump or gold ball bonding 15.
  • Because this design requires the electrical bonds 15 to be placed on the inside corners formed by the extended plates 18 of the HGA flexure cable (not shown) and the circuit board 14, it is difficult to create the bonds. It is a very limited space in which to operate. The alignment of the pads 16,18 and their electrical coupling is a great challenge. The quality and efficiency of the process is adversely affected by this challenge. The tooling and equipment costs can be great because of this. In addition, a problem with soldering the electrical connection 15 between the pads 16,18 is that the bonds must be cleaned immediately after soldering. Soldering flux, which is necessary for effective soldering, must be removed. Removing the flux can be difficult and costly. Solder, which consists primarily of tin, can cause component contamination. During soldering, tin may splash out, causing damage to surrounding electrical components and/or disk media.
  • It is therefore desirable to have a system and method for improving the electrical connection of a hard drive relay flexible circuit assembly to a head-gimbal assembly (HGA) flexure cable that avoids the above-mentioned problems, as well as having additional benefits.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 provides an illustration of a typical hard disk drive.
  • FIG. 2 shows a more detailed view of a head stack assembly (HSA) typical in the art.
  • FIG. 3 provides a more detailed illustration of the voice coil actuator assembly as is typical in the art.
  • FIG. 4 illustrates electrically coupling the head-gimbal assembly HGA flexure cable connecting pads to flexible circuit bonding pads as is typical in the art.
  • FIG. 5 illustrates a head-gimbal assembly (HGA) with a U-shaped relay flexible circuit-to-flexure cable connector according to an embodiment of the present invention.
  • FIG. 6 provides an illustration of the voice coil actuator assembly (without the flexure cables or arms attached) according to an embodiment of the present invention.
  • FIG. 7 illustrates the attachment of a U-shaped connector for a relay flexible cable to a coil carriage according to an embodiment of the present invention.
  • FIG. 8 illustrates a detailed illustration of the relay flexible circuit according to an embodiment of the present invention.
  • FIG. 9 provides an illustration of the attachment of a relay flexible circuit to a U-shaped connector and the attachment of the connector to a coil carriage according to an embodiment of the present invention.
  • FIG. 10 illustrates the electrical coupling of bonding pads on the relay flexible circuit to connector pads on the HGA flexure cable according to an embodiment of the present invention.
    • DETAILED DESCRIPTION
  • FIG. 5 illustrates a head-gimbal assembly (HGA) with a U-shaped relay flexible circuit-to-flexure cable connector according to an embodiment of the present invention. In one embodiment, a U-shaped connector 21 is seated to a portion of the coil carriage 8 (as explained below with respect to FIG. 6). The U-shaped connector 21 is assured correct positioning by one or more alignment pins 17. In this embodiment, pads (not shown) on each of the extended plates 18 of the flexure cables are bonded to pads (not shown) on the top/bottom of the connector 21 (described below).
  • FIG. 6 provides an illustration of the voice coil actuator assembly (without the flexure cables or arms attached) according to an embodiment of the present invention. In one embodiment, the U-shaped connector 21, which is attached to the relay flexible cable 9, is coupled to the coil carriage 8. In this embodiment, the connector 21 is placed over a portion of the coil carriage 8, where opposing tabs 25 on opposite sides of the connector 21 seat into grooves 23 located on the top and bottom of the coil carriage 8 (as described in FIG. 7).
  • FIG. 7 illustrates the attachment of a U-shaped connector for a relay flexible cable to a coil carriage according to an embodiment of the present invention. In one embodiment, as stated above, the connector 21 is placed over the coil carriage 8. In this embodiment, opposing tabs 25 on the connector 21 are shaped and located to seat in grooves 23 on the top and bottom of the coil carriage 8. In this embodiment, alignment pins 17 on the coil carriage 8 fit into alignment holes 30 on the connector 21 to assure proper positioning.
  • FIG. 8 illustrates a detailed illustration of the relay flexible circuit according to an embodiment of the present invention. In one embodiment, the relay flexible circuit 9 is attached to the connector 21 by epoxy 31 (further described below).
  • FIG. 9 provides an illustration of the attachment of a relay flexible circuit to a U-shaped connector and the attachment of the connector to a coil carriage according to an embodiment of the present invention. In one embodiment, as explained above, the relay flexible circuit 9 is attached to the U-shaped connector 21 by epoxy. In this embodiment, bonding pads 16 on the relay flexible circuit 9 are covered with an electrically conductive film 24, such as Anisotropic Conductive Film (ACF). The film 24, which in one embodiment is tacky, adheres to the pads 16.
  • FIG. 10 illustrates the electrical coupling of bonding pads on the relay flexible circuit to connector pads on the HGA flexure cable according to an embodiment of the present invention. In one embodiment, the conductive film 24, which is adhered to the bonding pads 16 is pressed against the connecting pads 19 of the flexure cable extended plates 18. In this embodiment, after positioning the flexure cable extended plates 18, the pads 16,18 are bonded. In this embodiment, a heated bonding tip 32 is pressed against the extended plate 18. The tip 32 heats and compresses the conductive film 24 to bring about the curing process.
  • Although several embodiments are specifically illustrated and described herein, it will be appreciated that modifications and variations of the present invention are covered by the above teachings and within the purview of the appended claims without departing from the spirit and intended scope of the invention.

Claims (15)

1-13. (canceled)
14. A method for manufacturing a hard disk drive arm comprising:
coupling, by a U-shaped connector, a relay flexible cable to a voice coil carriage assembly, said U-shaped connector including a plurality of generally parallel plates and said parallel plates including at least one bonding pad to electrically couple said relay flexible cable to a head gimbal assembly (HGA) flexure cable.
15. The method of claim 14, wherein said parallel plates include a plurality of opposing tabs.
16. The method of claim 15, wherein said voice coil carriage assembly has a plurality of grooves, said grooves being located on opposite sides of the voice coil carriage assembly.
17. The method of claim 16, wherein said grooves are shaped and located to accept said tabs.
18. The method of claim 14, wherein said U-shaped connector includes at least one alignment hole and said voice coil carriage assembly includes at least one alignment pin, said alignment hole shaped and located to accept said alignment pin.
19. The method of claim 14, wherein said bonding pad is to be coupled to at least one connecting pad on said HGA flexure cable by a conductive bonding agent.
20. The method of claim 19, wherein said bonding agent includes a plurality of electrically conductive particles.
21. The method of claim 20, wherein said bonding agent is to be compressed between said bonding pad and said connector pad, a number of said particles to form an electrical path between said bonding pad and said connector pad.
22. The method of claim 21, wherein said bonding agent is Anisotropic Conductive Film (ACF).
23. The method of claim 14, wherein said voice coil carriage assembly is molded polymer resin.
24. The method of claim 14, wherein said voice coil carriage assembly is stamped aluminum.
25. The method of claim 14, wherein said U-shaped connector has four bonding pads and said HGA flexure cable has four connecting pads.
26. The method of claim 25, wherein said bonding pads and said connecting pads are gold coated.
27-30. (canceled)
US11/397,162 2003-07-14 2006-04-04 System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an HGA flexure cable Abandoned US20060168796A1 (en)

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Application Number Priority Date Filing Date Title
US11/397,162 US20060168796A1 (en) 2003-07-14 2006-04-04 System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an HGA flexure cable

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WOPCT/CN03/00555 2003-07-14
PCT/CN2003/000555 WO2005006331A1 (en) 2003-07-14 2003-07-14 System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an hga flexure cable
US10/767,029 US7245458B2 (en) 2003-07-14 2004-01-28 System and method for improving the electrical connection of a hard drive relay flexible circuit assembly of an HGA flexure cable
US11/397,162 US20060168796A1 (en) 2003-07-14 2006-04-04 System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an HGA flexure cable

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US11/397,162 Abandoned US20060168796A1 (en) 2003-07-14 2006-04-04 System and method for improving the electrical connection of a hard drive relay flexible circuit assembly to an HGA flexure cable

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US20090080113A1 (en) * 2007-09-24 2009-03-26 Jen-Yuan Chang Vision guided system and method for micro-scale flex cable/integrated lead suspension solder pad positioning in HDD assembling process
CN103406870A (en) * 2013-08-30 2013-11-27 国家电网公司 Disassembly and migration tool for Winchester hard disc magnetic head and use method thereof
US9881640B2 (en) * 2013-12-10 2018-01-30 Western Digital Technologies, Inc. Disk drive head suspension tail with a noble metal layer disposed on a plurality of structural backing islands

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US8492673B2 (en) * 2008-12-23 2013-07-23 HGST Netherlands B.V. Reducing a generation of contaminants during a solder reflow process
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US8320084B1 (en) 2010-10-29 2012-11-27 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a flexure tail with features to facilitate bonding
US8477459B1 (en) 2010-10-29 2013-07-02 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a flexure tail with dual conductive layers and features to facilitate bonding
US8295013B1 (en) 2010-10-29 2012-10-23 Western Digital Technologies, Inc. Disk drive head stack assembly having a flexible printed circuit with heat transfer limiting features
US8325446B1 (en) 2010-10-29 2012-12-04 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a flexure tail with features to facilitate bonding
US8295014B1 (en) 2010-10-29 2012-10-23 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a flexure tail with transverse flying leads
US9633680B2 (en) 2010-10-29 2017-04-25 Western Digital Technologies, Inc. Head suspension having a flexure tail with a covered conductive layer and structural layer bond pads
US8467153B1 (en) 2010-10-29 2013-06-18 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a flexure tail with folded bond pads
CN104025553B (en) * 2011-07-14 2018-04-10 瑞典爱立信有限公司 Optimization engine and correlation technique in mobile cloud accelerator
US8665566B1 (en) 2011-12-20 2014-03-04 Western Digital Technologies, Inc. Suspension tail design for a head gimbal assembly of a hard disk drive
US8760812B1 (en) 2011-12-20 2014-06-24 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a jumper in a flexible printed circuit overlap region
US9335950B2 (en) 2013-03-15 2016-05-10 Western Digital Technologies, Inc. Multiple stream compression and formatting of data for data storage systems
US9448738B2 (en) 2013-03-15 2016-09-20 Western Digital Technologies, Inc. Compression and formatting of data for data storage systems
US9274978B2 (en) 2013-06-10 2016-03-01 Western Digital Technologies, Inc. Migration of encrypted data for data storage systems
US8934199B1 (en) 2014-03-31 2015-01-13 Western Digital Technologies, Inc. Disk drive head suspension tail with bond pad edge alignment features
US9524738B1 (en) 2015-06-25 2016-12-20 Western Digital Technologies, Inc. Disk drive head gimbal assembly having a flexure tail with a dielectric layer that has regions of lesser thickness
JP2019008861A (en) * 2017-06-26 2019-01-17 ウェスタン デジタル テクノロジーズ インコーポレーテッド Highly reliable structure of suspension/fpc connection

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US8869385B2 (en) 2007-09-24 2014-10-28 HGST Netherlands B.V. Apparatus for positioning components in HDD
CN103406870A (en) * 2013-08-30 2013-11-27 国家电网公司 Disassembly and migration tool for Winchester hard disc magnetic head and use method thereof
US9881640B2 (en) * 2013-12-10 2018-01-30 Western Digital Technologies, Inc. Disk drive head suspension tail with a noble metal layer disposed on a plurality of structural backing islands

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US20050011065A1 (en) 2005-01-20
WO2005006331A1 (en) 2005-01-20
CN1820320A (en) 2006-08-16
US7245458B2 (en) 2007-07-17

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