Mechanical Interlock Structures for Reworkable Chip Integration
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Solution Overview
Problem
Existing methods for mechanical attachment in microelectronics, such as solder joints and wiring, face challenges like thermal expansion mismatch and RF interference, and lack reworkable connections that provide strong physical and electrical bonds.
Innovation Solution
Mechanically interlocking structures with asymmetric designs, using compliant and rigid cantilevers, are fabricated through microfabrication processes, allowing for reworkable connections by snap engagement and disengagement with controlled force asymmetry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solder joints or wiring are used for mechanical attachment, then strong electrical connections are provided, but thermal expansion mismatch causes potential failure and RF interference occurs
Solution Approach 1:
The attachment structure is divided into separate rigid and compliant members that can independently respond to thermal and mechanical loads, segmenting the stress paths to prevent coupled thermal-electrical failures
Solution Approach 2:
The patent replaces traditional solder joints and wiring with a mechanical interlocking system using compliant members that can be deformed and engaged, eliminating the need for thermal bonding processes and reducing RF interference from conductive pathways
2Strength
If permanent attachment mechanisms like solder joints are used, then strong physical connections are achieved, but reworkability is lost
Solution Approach 1:
The attachment mechanism transitions from a static permanent bond to a dynamic reversible connection where compliant members can be deformed for engagement and deliberately deformed for controlled disengagement, enabling both strong physical connection and reworkability
Solution Approach 2:
The system utilizes changes in the deformation state of compliant members to transition between attached and detached states, allowing the same structure to provide permanent-like strength during operation and reversible detachment for repair
3Reliability
If traditional wiring methods are used, then electrical connections are established, but RF interference from pseudo-antenna effect occurs
Solution Approach 1:
The patent replaces traditional wiring with a mechanical interlocking system where electrical contact is established through the deformation and engagement of compliant members, eliminating the distributed conductive pathways that create pseudo-antenna effects
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
Provides strong, reworkable mechanical and electrical connections that reduce thermal stress and RF interference, enabling reusable chip integration and prototyping without damaging components.
Implementation Method 1
a compliant member extending from the second end of the second body, with the compliant member configured for deformation. The second structure is configured to form a connection with the first structure by deformation of at least a portion of the compliant member relative to the first structure
Data Source
AI summary
A system for mechanical attachment includes a first structure including a first body that is configured for a supporting surface and is connected to a member that extends from the first body. The system further includes a second structure including a second body that is also configured for a supporting surface with a compliant member that extends from the second body. The second structure is configured to form a connection with the first structure by deformation of at least a portion of the compliant member relative to the first structure.