Shape Memory Alloy Lens Drive With Intermediary Wire Fixing
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Solution Overview
Problem
Conventional lens driving devices using shape memory alloy wires are prone to issues such as abrasion and detachment of the intermediate portion due to sliding on hooks or strong impacts, leading to undesirable situations.
Innovation Solution
The lens driving device employs a configuration where the shape memory alloy wire is fixed at both ends to base-side metal members and an intermediate portion to a lens holding member, with intersecting wire arrangements to prevent sliding and detachment, using a combination of shape memory alloy wires and metal members to facilitate precise movement along optical axes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the shape memory alloy wire is fixed to hooks on the base member, then the lens holding member can be moved along the optical axis, but the intermediate portion is prone to abrasion and detachment due to sliding on the hooks
Solution Approach 1:
The patent introduces base-side metal members as intermediary components between the shape memory alloy wire and the base member. The wire is fixed to these metal members rather than directly to hooks on the base member, eliminating the sliding contact that causes abrasion and detachment while still enabling the lens holding member to move along the optical axis
2Ease of operation
If the shape memory alloy wire is fixed to hooks on the base member, then the lens holding member can be moved, but the intermediate portion is prone to detachment due to strong impacts
Solution Approach 1:
The base-side metal members serve as protective intermediaries that absorb and distribute impact forces. By fixing the wire to these robust metal members rather than directly to vulnerable hooks, the system maintains the ability to move the lens holding member while protecting against detachment caused by strong impacts
3Reliability
If the shape memory alloy wire is fixed to base-side metal members with intersecting arrangements, then sliding and detachment are prevented, but the device complexity increases
Solution Approach 1:
The patent combines multiple base-side metal members into an integrated structure that works together with the shape memory alloy wires. By merging these components into a coordinated system with intersecting arrangements, the design achieves reliable suppression of abrasion and detachment while managing the complexity through functional integration rather than separate independent elements
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 configuration effectively suppresses abrasion and detachment, ensuring reliable and precise movement of the lens holding member, enhancing the durability and functionality of the lens driving device.
Implementation Method 1
a driver configured to include a shape memory alloy wire configured to move the lens holding member along an optical axis direction with respect to the base member
Data Source
AI summary
A lens driving device includes a shape memory alloy wire including a first wire. The first wire has one end portion fixed to the first base-side metal member and the other end portion fixed to the second base-side metal member. An intermediate portion of the first wire positioned between the one end portion and the other end portion of the first wire is fixed to a first central fixing portion provided on the lens holding member. The first central fixing portion is arranged between the first base-side metal member and the second base-side metal member in a plan view along the optical axis direction, and the intermediate portion of the first wire is arranged at a position different from each of the one end portion and the other end portion of the first wire in the optical axis direction.