Flexural Guide Plate Substrates with Restoring Probe Force
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Solution Overview
Problem
Conventional vertical probe arrays suffer from issues such as dropped probes due to floating probes, which complicate assembly, require lengthy gap adjustments, and affect contact reliability, making spring head swapping difficult.
Innovation Solution
Implementing vertically compliant guide plates with flexural elements that provide a restoring force to push probes back into contact and allow controlled flexibility, reducing the reliance on assembly tolerances and planarity discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If probes are made floating to compensate for assembly tolerances and planarity variations, then assembly ease is improved, but probe reliability deteriorates due to dropped probes
Solution Approach 1:
The guide plate is designed with flexural elements that change its mechanical properties from rigid to compliant, allowing it to flex vertically to accommodate assembly tolerances while maintaining probe contact through elastic recovery
Solution Approach 2:
The guide plate transitions from a static rigid structure to a dynamic compliant structure that can adapt its position to accommodate probe movement and maintain contact through elastic deformation and recovery
2Adaptability or versatility
If probes are allowed to float vertically, then adaptability to assembly variations is improved, but device complexity increases due to gap adjustment requirements
Solution Approach 1:
The flexural guide plate automatically compensates for assembly variations and maintains probe contact without requiring external adjustment mechanisms or complex gap adjustment procedures
Solution Approach 2:
The guide plate's mechanical compliance parameter is changed to allow automatic adaptation to assembly variations through elastic deformation, eliminating the need for complex adjustment procedures
3Manufacturing precision
If a rigid guide plate is used, then manufacturing precision is improved, but contact resistance increases due to insufficient contact force
Solution Approach 1:
The guide plate's mechanical properties are changed from rigid to compliant, allowing it to apply contact force to probes while maintaining positioning precision through controlled elastic deformation
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
This solution effectively eliminates dropped probes, simplifies assembly, reduces sensitivity to planarity, improves contact resistance, and enhances spring head interchangeability, while maintaining some residual float to accommodate curvature.
Implementation Method 1
a vertically compliant guide plate is used to provide a restoring force tending to push dropped probes back into contact with the space transformer
Data Source
AI summary
Guide plates for vertical probe heads include flexure elements that provide a defined flexibility for otherwise rigid guide plates. Such flexibility can be vertical or lateral. This concept allows several disadvantages of conventional probe heads to be alleviated. For example, a vertically flexible upper guide plate can be used to alleviate issues relating to dropped probes. A vertically flexible lower guide plate can be adjusted in operation to expose more probe length as probes wear in operation.