Shape Memory Alloy Camera Module Actuator for Handshake Correction
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Solution Overview
Problem
Miniaturized camera modules in mobile devices face challenges in correcting hand shaking, as existing solutions like voice coil motors increase size and complexity, making it difficult to achieve effective image stabilization.
Innovation Solution
A camera module design incorporating a shape memory alloy wire part and elastic members to generate driving force in two directions perpendicular to the optical axis, allowing the lens holder and driving unit to move, thereby correcting hand shaking without increasing module size, using a combination of shape memory alloy wires and elastic members to apply preload and generate movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voice coil motor (VCM) is used as the lens actuator for hand shaking correction, then hand shaking correction function is achieved, but the size of the camera module is increased
Solution Approach 1:
The patent replaces the traditional voice coil motor (electromagnetic actuator) with a shape memory alloy wire-based actuator system. The shape memory alloy wires generate mechanical force through thermal activation, substituting the electromagnetic field-based VCM with a thermomechanical actuation mechanism that occupies less space
Solution Approach 2:
The patent utilizes temperature as a control parameter to activate the shape memory alloy wires. By changing the temperature (through applied voltage heating), the shape memory alloy wires transform their physical state and generate driving force, enabling compact actuation without the bulk of traditional motors
2Reliability
If additional driving actuators are added for hand shaking correction, then correction capability is improved, but the complexity of the device structure is increased
Solution Approach 1:
The patent combines multiple functions into the shape memory alloy wire system. The same wires that provide driving force also work in conjunction with elastic members to provide both actuation and preloading functions, reducing the need for separate components and simplifying the overall structure
Solution Approach 2:
The shape memory alloy wires serve multiple purposes: they provide the primary driving force for lens movement, work with elastic members to maintain preloading, and enable bidirectional movement when configured in pairs. This multi-functionality reduces the number of dedicated components needed
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 design effectively stabilizes images by accurately correcting hand shaking in both X and Y-axis directions, ensuring clear images while maintaining a compact module size and avoiding the limitations of traditional actuators.
Implementation Method 1
a shape memory alloy wire part connected to the driving unit to generate driving force in the vertical direction to the optical-axis direction
Implementation Method 2
an elastic member applying a preload to the shape memory alloy wire part to cause initial transformation
Data Source
AI summary
Disclosed herein is a camera module, including: a lens holder including a receiving unit receiving a lens module therein; a driving unit joined to the lens holder to be movable in a direction vertical to an optical-axis direction; a housing in which the driving unit is installed to be movable in the vertical direction to the optical-axis direction and having a protruding member that protrudes on one surface thereof; a shape memory alloy wire part connected to the driving unit to generate driving force in the vertical direction to the optical-axis direction; and an elastic member applying a preload to the shape memory alloy wire part to cause initial transformation.