SMA Wire Attachment with Adhesive for Camera Lens Suspension
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Solution Overview
Problem
Existing suspension assemblies using shape-memory alloy (SMA) wires face challenges in coupling electrical signals effectively without damaging the SMA wires, particularly in camera lens suspension systems, where the structures are prone to damage during use.
Innovation Solution
The integration of adhesive and crimp structures on the support and moving members of the suspension assembly, which securely attach SMA wires while allowing for independent actuation and reducing the risk of damage by distributing stress and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SMA wires are attached using traditional crimp structures, then electrical signal coupling is achieved, but the SMA wires are prone to damage during use
Solution Approach 1:
The patent introduces adhesive as an intermediary material between the crimp structure and the SMA wire. This adhesive layer acts as a stress-distributing medium that prevents direct mechanical contact between the rigid crimp and the flexible SMA wire, thereby reducing the risk of wire damage while maintaining electrical coupling
Solution Approach 2:
The attachment structure combines multiple materials with different properties: the conductive crimp structure for electrical coupling, the adhesive material for stress distribution and protection, and the SMA wire for actuation. This composite approach allows each material to perform its optimal function while mitigating the weaknesses of individual materials
2Reliability
If adhesive is added to attach SMA wires, then the likelihood of damaging SMA wires is reduced, but the device complexity increases
Solution Approach 1:
The patent merges the adhesive attachment function with the existing crimp structure into a single integrated attachment mechanism. Rather than adding a completely separate attachment system, the adhesive works in conjunction with the crimp to create a unified structure that provides both mechanical securing and electrical coupling, thereby limiting the increase in complexity
3Reliability
If traditional wire attachment structures are used, then manufacturing is efficient, but the suspension assembly is susceptible to SMA wire damage
Solution Approach 1:
The adhesive is applied to the crimp structure before the SMA wire is inserted and crimped. This preliminary application of adhesive ensures that the protective layer is already in place during the assembly process, allowing for efficient manufacturing while ensuring wire protection from the outset
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 enhances the robustness and efficiency of the suspension assembly by securely attaching SMA wires, reducing the likelihood of damage and ensuring reliable electrical signal coupling, thereby improving the functionality and manufacturing efficiency of camera lens suspension systems.
Implementation Method 1
an adhesive disposed between portions of at least one of: the one or more first wire attach structures and the one or more second wire attach structures
Implementation Method 2
shape-memory alloy (SMA) wires... The suspension is actuated by applying electrical drive signals to the SMA wires
Data Source
AI summary
Embodiments of the disclosure include a suspension assembly having a support member, a moving member movably coupled to the support member, and shape metal alloy wires coupled between the support and moving members by attachment structures. According to various embodiments, the attachment structures include at least one of: an adhesive disposed proximate to a side of the attachment structures and between the attachment structures.