Optical Driving Assembly Using Shape Memory Alloy Wires
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Solution Overview
Problem
Existing optical image stabilization solutions for smart electronic devices, such as those using voice coil motors, face issues like high power consumption, limited stabilization effect, large product volume, and high unit prices.
Innovation Solution
An optical driving assembly that employs shape memory alloy wires to drive an optical sensor in two perpendicular directions, utilizing a fixation member, moving member, and supporting member to achieve independent linear movement and stabilize images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voice coil motor is used to drive the lens for optical image stabilization, then the stabilization function is achieved, but power consumption increases and product volume increases
Solution Approach 1:
The patent replaces the voice coil motor (electromagnetic system) with shape memory alloy wires (thermo-mechanical system) to drive the optical sensor. The shape memory alloy wires utilize thermal expansion and phase transformation properties to generate mechanical force, eliminating the need for complex electromagnetic components and reducing power consumption while maintaining stabilization functionality.
Solution Approach 2:
The patent utilizes the temperature-dependent phase transformation characteristics of shape memory alloy wires. By applying localized heating (changing temperature parameter), the alloy wires transform from martensite to austenite phase, generating mechanical force to drive the optical sensor. This parameter-based actuation method simplifies the system structure and reduces overall power consumption compared to continuous electromagnetic driving.
2Reliability
If voice coil motor is used to drive the lens for optical image stabilization, then the stabilization function is achieved, but product volume increases
Solution Approach 1:
The patent replaces the voice coil motor with shape memory alloy wires, which have significantly smaller dimensions. The wire-based actuation system eliminates the need for bulky electromagnetic coils, magnets, and associated control electronics, thereby dramatically reducing the volume of the optical image stabilization module while maintaining its stabilization function.
Solution Approach 2:
The patent employs a nested structure where the optical sensor is positioned within the optical element, and the shape memory alloy wires are integrated within the sensor assembly. This nested arrangement maximizes space utilization and minimizes the overall volume of the stabilization system by eliminating empty spaces and overlapping components.
3Reliability
If voice coil motor is used to drive the lens, then angle correction is achieved, but the stabilization effect is limited
Solution Approach 1:
The patent divides the actuation system into multiple independent shape memory alloy wire groups, with each group responsible for driving the optical sensor along a specific axis. This segmented approach enables independent control of movement in different directions, allowing the system to correct both horizontal and vertical image deviations separately, thereby enhancing the overall stabilization effect and adaptability compared to single-axis voice coil motor control.
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 solution reduces power consumption, enhances optical image stabilization, and decreases product size while maintaining a lower unit price by using shape memory alloy wires to control the optical sensor's movement, allowing for effective image stabilization without interference between movement directions.
Implementation Method 1
The first driving assembly includes first shape memory alloy wires, each of which is connected the fixation member and the moving member. The second driving assembly includes second shape memory alloy wires, each of which is connected to the moving member and the supporting member.
Data Source
AI summary
An optical driving assembly includes an optical element having an optical axis, an optical sensor, and a driving module driving optical sensor to translate along a direction perpendicular to the optical axis. The driving module includes a fixation member provided with a moving cavity, a moving member provided in the first moving cavity and movably connected to the fixation member along a first direction and provided with a second moving cavity, a supporting member provided in the second moving cavity and movably connected to the moving member along a second direction and supporting the optical sensor, and first and second driving assemblies. The first and second driving assemblies include first and second shape memory alloy wires. The optical sensor can linearly move in two directions perpendicular to the optical axis, achieving optical image stabilization and independent movements in two directions that are not affected by each other.