SMA Wire Lens Driving Mechanism for Compact Focus Adjustment
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Solution Overview
Problem
Miniaturization of electronic devices with lens adjustment mechanisms poses challenges due to increased mechanical design complexity and reduced reliability and driving force.
Innovation Solution
A driving mechanism utilizing Shape Memory Alloy (SMA) wires and connecting members to rotate and slide optical elements, enabling precise and efficient movement of lenses through a hinge and shaft system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If several coils and magnets are used for adjusting the focus of a lens, then the lens can be moved to adjust focus, but the device size increases and mechanical design complexity increases
Solution Approach 1:
The patent replaces the traditional mechanical coil and magnet system with a Shape Memory Alloy (SMA) wire-based actuation system. The SMA wires directly drive the lens movement through thermal expansion and contraction, eliminating the need for complex electromagnetic mechanisms and reducing overall device complexity while maintaining reliable focus adjustment.
Solution Approach 2:
The patent utilizes the temperature-dependent dimensional changes of Shape Memory Alloy wires to drive lens movement. By controlling the thermal state of the SMA wires (heating and cooling cycles), the system achieves precise lens positioning without complex mechanical components, thereby improving reliability while reducing design complexity.
2Reliability
If several coils and magnets are used for adjusting the focus of a lens, then the lens can be moved to adjust focus, but the driving force decreases
Solution Approach 1:
The patent replaces the electromagnetic driving system with a Shape Memory Alloy-based actuation system. The SMA wires generate sufficient driving force through their phase transformation and thermal expansion properties, providing reliable lens movement with enhanced force characteristics compared to traditional coil and magnet systems.
3Volume of moving object
If the electronic device is miniaturized, then the device becomes thinner and more convenient, but the mechanical design difficulty increases
Solution Approach 1:
The patent implements miniaturization by replacing bulky electromagnetic components with compact Shape Memory Alloy wire actuators. This substitution enables the device to achieve a thinner profile while simultaneously reducing mechanical design complexity, as the SMA-based system requires fewer and simpler mechanical parts.
Solution Approach 2:
The patent exploits the unique thermal-mechanical properties of Shape Memory Alloys to create a compact actuation system. By controlling temperature parameters, the SMA wires achieve effective lens movement within a minimized space, enabling device miniaturization without proportionally increasing design complexity.
4Volume of moving object
If the electronic device is miniaturized, then the device becomes thinner and more convenient, but the driving force for moving the lens decreases
Solution Approach 1:
The patent addresses the driving force challenge in miniaturized devices by utilizing the high energy density and significant dimensional changes of Shape Memory Alloys during phase transformation. The SMA wires generate sufficient actuation force within a compact volume, enabling effective lens movement even in thinned device configurations.
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
Facilitates miniaturization and enhances reliability by providing rapid and accurate positioning of optical elements, improving the mechanical design of electronic devices.
Implementation Method 1
The first wire has Shape Memory Alloy (SMA) material and connects the free end to the fixed part. When the first wire contracts in length, the first connecting member is forced to rotate relative to the fixed part around the hinge
Data Source
AI summary
A driving mechanism is provided, including a fixed part, a movable part connected to the fixed part, a first connecting member, and a first wire. The first connecting member is hinged to the fixed part and connected to the movable part. The first wire has SMA material and is connected between the fixed part and the first connecting member. When the first wire contracts in length, the first connecting member rotates relative to the fixed part, and the movable part is driven to move relative to the fixed part.