Flexure including a heat sink and a dielectric layer under trace termination pads

a dielectric layer and trace termination technology, applied in the field of flexures of head gimbal assemblies, can solve the problems of flexure to distort or fail solder bonds, unacceptably high residual pitch torque, and adversely affect the height at which the head flies above the disk

Active Publication Date: 2009-07-28
WESTERN DIGITAL TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One problem that arises during HGA assembly, when solder is used to connect bonding pads of the transducer to the termination pads on the flexure, is that the solder shrinks as it cools and solidifies.
This force can cause the flexure to distort or solder bonds to fail, or both.
A sufficiently distorted flexure may create a large enough pitch static angle (PSA) change in the orientation of the head that, when straightened during assembly, an unacceptably high residual pitch torque adversely affects the height at which the head flies above the disk.

Method used

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Examples

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Embodiment Construction

[0015]FIG. 1 shows a top view of an exemplary head gimbal assembly (HGA) suspension 100 according to an embodiment of the present invention. The HGA suspension 100 comprises three layers, shown side-by-side in FIG. 2. Specifically, the HGA suspension 100 comprises a metal base layer 110, a trace layer 120 disposed over the base layer 110, and a dielectric layer 130 disposed between the trace layer 120 and the base layer 110. A cross-section along the line 3-3 in FIG. 1 is shown in FIG. 3. FIG. 4 shows a HGA 400, according to an exemplary embodiment of the present invention, comprising a HGA suspension 410 and a head 420. The base layer 110, trace layer 120, and dielectric layer 130 can be formed by conventional processes known in the art.

[0016]Referring to FIG. 2, the base layer 110 comprises a metal such as stainless steel. In some embodiments, a thickness of the base layer 110 is in the range of about 10 μm to 25 μm, for example, 20 μm. The base layer 110 includes two outrigger be...

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Abstract

A flexure is provided for a HGA suspension. The flexure includes a metal base layer, a trace layer, and a dielectric layer disposed between the trace and base layers. The metal base layer includes a heat sink portion. The trace layer includes a plurality of conductive traces, each conductive trace having a curved section that terminates in a trace termination pad. The dielectric layer includes a portion that underlies the trace termination pads and overlies the heat sink portion. The base layer and the dielectric layer each also include a window. The curved section of each conductive trace extends over the window of the base layer. The curved section of each conductive trace may at least partially extend over the window of the dielectric layer.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates generally to the field of disk drives and more particularly to flexures of head gimbal assemblies thereof.[0003]2. Description of the Prior Art[0004]Disk drives store and retrieve data for digital electronic apparatuses such as computers. A typical magnetic disk drive comprises a head, including a slider and a transducer, in very close proximity to a surface of a rotatable magnetic disk. The transducer, in turn, includes a write element and / or a read element. As the magnetic disk rotates beneath the head, a very thin air bearing is formed between the surface of the magnetic disk and an air bearing surface of the slider. The write element and the read element can be alternately employed to write and read data while an actuator assembly positions the heads along desired magnetic “tracks” on the magnetic disk.[0005]In order to keep the head properly oriented and at the correct height above the...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): G11B5/48
CPCG11B5/4853
Inventor ZHANG, YIDUOLAWSON, DREW B.PAN, TZONG-SHIIPALMER, DARRELL D.CHEN, YIH-JEN
Owner WESTERN DIGITAL TECH INC
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