HGA Flex Connector Assembly Using Anisotropic Conductive Film
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Solution Overview
Problem
Establishing strong, reliable, and signal-noise resistant electrical connections between the flex connector and the head-gimbal assembly (HGA) connector in hard disk drives is challenging due to micro-scale sizes and space constraints, requiring innovative solutions to ensure effective signal communication.
Innovation Solution
A connector assembly comprising a head-gimbal assembly tail connector with a pad support, HGA pad, and HGA trace, coupled with a flex connector having a substrate, flex pad, and via, and an adhesive, such as an anisotropic conductive film, to establish electrical contact and mechanical coupling between the HGA and flex connectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If micro-scale components are used to reduce size, then space constraints are improved, but connection reliability deteriorates
Solution Approach 1:
The patent combines mechanical attachment and electrical connection functions into a single integrated connector assembly. The HGA connector and flex connector are mechanically attached while simultaneously establishing electrical connections through aligned pads and traces, eliminating the need for separate connection mechanisms and improving reliability despite micro-scale dimensions.
Solution Approach 2:
The connector components are pre-aligned and pre-positioned during assembly before final bonding. The pads and traces are precisely positioned in advance to ensure proper alignment, and the adhesive is applied beforehand to secure the connection, preventing misalignment issues that could compromise reliability in micro-scale connectors.
2Strength
If adhesive is used to bond connectors, then mechanical coupling is improved, but signal noise resistance deteriorates
Solution Approach 1:
The adhesive is applied in localized areas rather than covering the entire connector surface. By confining the adhesive to specific bonding zones, the design maintains strong mechanical coupling where needed while leaving signal transmission areas free from adhesive contamination, thus preserving signal noise resistance.
Solution Approach 2:
The connector design incorporates intermediate structures such as pad supports and trace configurations that act as mediators between the adhesive bonding area and the signal transmission path. These intermediaries isolate the signal paths from direct contact with the adhesive, allowing strong mechanical bonding without compromising signal integrity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides robust, reliable, and signal-noise resistant electrical connections, enhancing the operational control of head-gimbal assemblies in hard disk drives by ensuring consistent and efficient signal transmission.
Implementation Method 1
The adhesive comprises an anisotropic conductive film. The anisotropic conductive film comprises electrically-conductive particles embedded within an electrically non-conductive material. The electrically-conductive particles of the anisotropic conductive film between the HGA pad and the flex pad establish electrical contact between the HGA pad and the flex pad.
Data Source
AI summary
Described herein is a connector assembly that comprises a head-gimbal assembly (HGA) tail connector, a flex connector, and an adhesive. The HGA tail connector comprises a pad support, an HGA pad coupled to the pad support, and an HGA trace coupled to the pad support and electrically coupled to the HGA pad. The flex connector comprises a substrate, comprising a first side and a second side, where the first side is opposite the second side. The flex connector also comprises a flex pad coupled to the first side of the substrate, a flex trace coupled to the second side of the substrate, and a via extending through the substrate from the first side to the second side. The via electrically couples the flex pad and the flex trace. Also, the adhesive adheres the HGA pad of the HGA connector in electrical contact with the flex pad of the flex connector.