Shape Memory Alloy Driving Mechanism for Compact AF and OIS
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Solution Overview
Problem
The challenge of reducing the size and increasing the durability of driving mechanisms in modern electronic devices with image-capturing and video-recording functions, particularly in smartphones and digital cameras, while maintaining effective auto focus and optical image stabilization capabilities.
Innovation Solution
A driving mechanism comprising a fixed portion, movable portion, driving assembly, circuit assembly, and signal adjusting assembly, utilizing shape memory alloy for driving elements and multiple circuits for precise control and stabilization, with sensing assemblies for detecting movement and adjusting signals to achieve auto focus and optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the driving mechanism size is reduced to meet modern device requirements, then the device becomes more compact and lightweight, but the durability and reliability of the driving mechanism deteriorates
Solution Approach 1:
The patent combines the first and second driving elements into a single integrated driving assembly that shares common structural components, including the holder, frame, and resilient elements. This merging reduces the overall volume of the driving mechanism while maintaining the functional reliability through redundant driving capability and shared load-bearing structures.
Solution Approach 2:
The patent implements a nested configuration where the first and second driving elements are positioned within a shared accommodating space defined by the case and bottom. The resilient elements are nested between the base unit and the frame, allowing compact arrangement that reduces overall mechanism size while preserving durability through distributed stress paths.
2Measurement precision
If multiple driving elements are used to improve control precision, then the auto focus and image stabilization performance is enhanced, but the device complexity increases
Solution Approach 1:
The patent designs the driving assembly with multi-functional capability where the first and second driving elements can independently or simultaneously operate to achieve both auto focus and optical image stabilization functions. The shared resilient elements and frame structure serve multiple purposes: providing mechanical support, enabling movement, and absorbing stresses, thereby reducing overall system complexity despite multiple driving functions.
Solution Approach 2:
The patent segments the control functions by providing separate circuit paths (first circuit and second circuit) that can independently control the first and second driving elements. This segmentation allows precise control of each driving element for specific functions (AF or OIS) while the shared mechanical structure reduces the complexity that would otherwise result from completely separate systems.
3Length of moving object
If the driving mechanism is miniaturized, then the device becomes thinner and lighter, but the mechanical interference and signal interference increase
Solution Approach 1:
The patent employs asymmetric positioning of the first and second driving elements within the compact accommodating space, with each element oriented at different angles and positions relative to the optical axis. This asymmetric arrangement minimizes mechanical interference between the driving elements while maintaining effective driving forces, allowing miniaturization without proportionally increasing interference.
Solution Approach 2:
The patent introduces the resilient elements as intermediary components between the driving elements and the frame/base unit. These resilient elements act as mediators that decouple the mechanical interactions between adjacent driving elements, reducing direct mechanical interference while transmitting the necessary driving forces. The signal adjusting assembly similarly acts as an intermediary to reduce electrical signal interference in the miniaturized configuration.
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 enables miniaturization and enhances durability of the driving mechanism, providing accurate auto focus and optical image stabilization while reducing mechanical interference and improving overall device performance.
Implementation Method 1
The first driving element comprises shape memory alloy. The second driving element comprises shape memory alloy.
Data Source
AI summary
A driving mechanism is provided. The driving mechanism includes a fixed portion, a movable portion, a driving assembly, a circuit assembly, and a signal adjusting assembly. The movable portion is movable relative to the fixed portion. The driving assembly is used for driving the movable portion to move relative to the fixed portion. The driving assembly is used for receiving a first signal provided by a control assembly. The driving assembly is electrically connected to the control assembly by the circuit assembly. The signal adjusting assembly is electrically connected to the driving assembly. The signal adjusting assembly is used for adjusting the first signal.