Lens Assembly with Shape Memory Alloy Wires for OIS
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Solution Overview
Problem
Existing camera lens modules face challenges with magnetic field interference, complex structure, high cost, large weight, and high power consumption due to their reliance on optical image stabilization using a hall sensor and a magnet-based system.
Innovation Solution
A lens assembly utilizing memory alloy wires that are energized to deform and drive the lens for optical image stabilization, eliminating the need for a magnet and hall sensor, resulting in a simpler, lighter, and more cost-effective structure with reduced power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a hall sensor and magnet-based system is used for optical image stabilization, then the lens module can achieve image stabilization function, but the structure becomes complicated, weight increases, and magnetic field interference occurs
Solution Approach 1:
The patent removes the hall sensor and magnet components from the optical image stabilization system, extracting only the essential function of position detection and correction. This is achieved by using a simplified structure where the lens barrel directly detects its own position deviations without requiring external magnetic field sensors, thereby eliminating magnetic field interference and reducing structural complexity while maintaining the image stabilization function
Solution Approach 2:
The lens barrel structure is designed to serve multiple functions: it acts as both the housing for optical components and the actuator for image stabilization. The integrated design allows the lens barrel to detect its own position deviations and perform correction movements without requiring separate dedicated components, thereby reducing overall device complexity and weight while maintaining stabilization reliability
2Reliability
If a hall sensor and magnet-based system is used for optical image stabilization, then the lens module can achieve image stabilization function, but the weight increases due to additional components
Solution Approach 1:
The patent eliminates the heavy magnet and hall sensor components from the stabilization system, extracting only the essential position detection and correction functions. This component reduction directly decreases the weight of the moving lens assembly while maintaining the image stabilization capability through a lighter, integrated lens barrel structure that detects and corrects its own position deviations
Solution Approach 2:
The patent merges the functions of the lens barrel housing, position detection sensor, and stabilization actuator into a single integrated component. This consolidation eliminates the need for separate magnet and hall sensor assemblies, significantly reducing the overall weight of the moving object while maintaining the reliability of the image stabilization function through the integrated structure
3Force
If a large current is applied to the OIS coil to form a large electromagnetic force, then the magnet can be driven to prevent deviation, but the power consumption increases
Solution Approach 1:
The patent replaces the electromagnetic force generation system (OIS coil and magnet) with a mechanical detection and correction system. The lens barrel directly detects position deviations mechanically and performs correction movements without requiring large electromagnetic forces, thereby dramatically reducing power consumption while maintaining the necessary correction capability for image stabilization
4Difficulty of detecting and measuring
If an additional hall element is required for detecting shaking of a lens barrel, then the detection function is achieved, but the reliability decreases under special circumstances
Solution Approach 1:
The lens barrel is designed to detect its own position deviations autonomously without requiring external hall sensors. This self-detection capability allows the lens barrel to sense its own shaking and position changes directly, eliminating the need for additional detection elements that may fail under special circumstances, thereby improving reliability while maintaining the detection function
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 memory alloy wire-based system provides high stability with reduced magnetic interference, lower weight and cost, and lower power consumption, while maintaining effective optical image stabilization and auto focusing capabilities.
Implementation Method 1
A lens assembly utilizing memory alloy wires that are energized to deform and drive the lens for optical image stabilization
Data Source
AI summary
Provided is a lens assembly, including: a first base including a first bottom plate, and first and second side plates; a lens; and first and second memory alloy wires. The first memory alloy wire includes ends connected to the first side plate and the lens. The second memory alloy wire includes ends to the second side plate and the lens. Both the first and second memory alloy wires are perpendicular to an optical axis of the lens. According to the present invention, the first and second memory alloy wires are energized to deform, to drive the lens to reciprocate between the first and second side plates to achieve optical image stabilization. Therefore, there is no problem of magnetic field interference, and stability thereof is high. Such driving leads to a simple structure and convenient assembling without an additional Hall element, and has high usage reliability in a special environment.