Camera Module Shape Memory Alloy Actuation
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Solution Overview
Problem
Camera modules in portable electronic devices face challenges in reducing size and complexity while integrating functions like autofocusing and optical image stabilization, leading to increased device size and power consumption.
Innovation Solution
A camera module design utilizing shape memory alloy driving wires and elastic wires to move internal components, allowing for efficient autofocusing and optical image stabilization with reduced size and power consumption, and incorporating support bars and ball members for precise movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If general OIS driving methods and diverse structures are used to implement autofocusing and optical image stabilization functions, then the functions can be achieved, but the structure of the camera module becomes complex and the size of the camera module increases
Solution Approach 1:
The patent combines multiple driving functions (autofocusing and optical image stabilization) into a single integrated driving member that uses shape memory alloy wires. This merging of functions into one component reduces structural complexity while maintaining full functionality, directly resolving the contradiction between function integration and structure complexity
Solution Approach 2:
The driving member is designed with universal capability to perform both autofocusing and optical image stabilization operations. The shape memory alloy wires can be controlled to achieve different movement patterns, allowing one component to fulfill multiple functions, thereby reducing the number of separate components needed
2Adaptability or versatility
If general OIS driving methods and diverse structures are used to implement autofocusing and optical image stabilization functions, then the functions can be achieved, but the size of the camera module increases
Solution Approach 1:
By merging multiple driving functions into a single integrated driving member with shape memory alloy wires, the patent reduces the overall volume required for housing these functions. The consolidated structure eliminates the need for separate mechanisms, directly addressing the size increase issue
Solution Approach 2:
The patent employs a nested arrangement where the second moving body is disposed within the first moving body, and driving members are integrated within the housing structure. This nesting approach allows compact packaging of multiple functional elements, reducing the overall camera module size while maintaining full functionality
3Measurement precision
If multiple driving wires are used to control moving bodies, then precise movement can be achieved, but the risk of damage from external impacts increases and control operations become complex
Solution Approach 1:
The patent extracts and eliminates unnecessary driving wires from the system, retaining only the essential shape memory alloy wires that provide both driving and supporting functions. This reduction in the number of wires decreases the risk of impact damage while maintaining precise movement control through the remaining optimized wire structure
Solution Approach 2:
The shape memory alloy wires are designed to serve multiple functions simultaneously: they provide driving force for precise movement and also act as supporting structures. This multi-functionality reduces the total number of components needed, thereby improving reliability by reducing potential failure points from external impacts
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 design achieves enhanced stroke distance and reduced power consumption by leveraging shape memory alloys and elastic wires, while minimizing the number of driving wires to prevent damage from external impacts and simplify control operations.
Implementation Method 1
a first driving member disposed in a space between the housing and the first moving body, and including a first driving wire formed of a shape memory alloy
Implementation Method 2
the first driving member may move the first moving body by the first curved elastic wire transformed by expansion and contraction of the first driving wire
Data Source
AI summary
A camera module includes a housing having an internal space; a first moving body disposed in the internal space of the housing; a second moving body disposed in an internal space of the first moving body; a first driving member disposed in a space between the housing and the first moving body, and including a first driving wire formed of a shape memory alloy and a first curved elastic wire connected to both ends of the first driving wire; and a second driving member disposed in a space between the first moving body and the second moving body, and including a second driving wire formed of a shape memory alloy and a second curved elastic wire connected to both ends of the driving wire for AF. The first curved elastic wire is in contact with the first moving body and the second curved elastic wire is in contact with the second moving body.