Thermocentric Alignment via Flexible Flexure Constraints
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Solution Overview
Problem
Products with multiple aligned parts face challenges in maintaining alignment during thermal expansion or contraction, as existing technologies fail to effectively couple adjacent parts to ensure consistent alignment across temperature ranges.
Innovation Solution
The use of an apparatus with alignment features and constraints that allow for predetermined relative motion expansion or contraction, featuring flexible constraints with flexures to accommodate oversized or misaligned alignment features, ensuring alignment of elements across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If rigid constraints are used to maintain alignment, then alignment precision is improved, but the ability to accommodate thermal expansion and contraction is reduced
Solution Approach 1:
The constraint structure incorporates flexible elements that can dynamically adjust their position and shape in response to thermal expansion and contraction of the substrate, allowing the alignment features to maintain contact and alignment while accommodating dimensional changes
Solution Approach 2:
The flexible elements change their mechanical properties and dimensions in response to temperature variations, allowing the constraint to adapt to thermal expansion and contraction while maintaining alignment precision through elastic deformation
2Ease of operation
If alignment features are made oversized to accommodate misalignment, then ease of assembly is improved, but the precision of alignment is reduced
Solution Approach 1:
The flexible elements can elastically deform to accommodate variations in alignment feature dimensions, allowing oversized features to be received while still achieving precise alignment through the flexibility-induced adjustment
Solution Approach 2:
The flexible elements provide built-in tolerance compensation that anticipates and absorbs misalignment errors before they affect the final alignment, cushioning against the impact of oversized or slightly misaligned features
3Manufacturing precision
If multiple constraints are used to ensure alignment, then alignment precision is improved, but device complexity is increased
Solution Approach 1:
The flexible elements serve multiple functions simultaneously: they provide constraint to limit movement, flexibility to accommodate thermal expansion, and alignment guidance to maintain precision, reducing the need for separate specialized components
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 ensures precise alignment of parts despite thermal changes, reducing positional errors and maintaining alignment over a temperature range by using flexible constraints that can flex to receive oversized or misaligned features, thereby enhancing the stability and reliability of the assembly.
Implementation Method 1
The flexures can allow the sidewalls to flex and thereby receive an alignment feature that has a dimension that is larger than the opening
Implementation Method 2
corresponding elements on the adjacent parts of the product remain aligned even as one or both of the adjacent parts undergo thermal expansion or contraction over the temperature range
Data Source
AI summary
A first device and a second device can include at least one alignment feature and at least one corresponding constraint. The alignment feature and the constraint can be configured to align the first device and the second device when the alignment feature is inserted into the constraint. The alignment feature and the constraint can be further configured to direct relative movement between the first device and the second device due to relative thermal expansion or contraction between the first device and the second device. The directed relative movement can keep the first device and the second device aligned over a predetermined temperature range.