SMA Actuation Combining Camera Module Tilt and Translation
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Solution Overview
Problem
Existing SMA actuation apparatuses face challenges in controlling the movement of camera modules due to resistance from stiff components, such as electrical connections, which complicates the control of movements required for optical image stabilization and autofocus functions.
Innovation Solution
An SMA actuation apparatus that combines tilting and translational movements to align the axis of rotation with the natural axis of rotation of stiff components, using a control circuit to generate drive signals that adjust the position of the axis of rotation, thereby reducing resistance and enabling easier control of the movable part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If stiff components (electrical connections) are used to connect the movable camera module to the stationary portion, then structural stability and electrical connectivity are improved, but resistance to movement increases and control difficulty worsens
Solution Approach 1:
The patent applies the dynamics principle by making the connection between the movable camera module and stationary portion adaptable through controlled movement. The SMA actuator enables the system to transition from a rigid connection state to a dynamically adjusted state, allowing the movable part to tilt and translate along controlled paths while maintaining electrical connectivity. This dynamic adjustment reduces resistance from stiff components by aligning movement axes with the natural rotation axes of the connection structure.
Solution Approach 2:
The patent applies parameter changes by modifying the position and orientation parameters of the movable camera module relative to the stationary portion. Through SMA actuation, the system changes positional parameters (translation along x-axis, tilt angles about y and z axes) to optimize the relationship between the movable and stationary components. This parameter adjustment allows the movement axis to be positioned closer to the natural axis of rotation of stiff components, reducing resistance while maintaining structural stability.
2Adaptability or versatility
If the axis of rotation is positioned away from the natural axis of rotation of stiff components, then movement freedom is improved, but resistance from stiff components increases
Solution Approach 1:
The system dynamically adjusts the axis of rotation position through SMA actuation, transitioning between different operational states. The movable part can tilt about first axes and translate, allowing the effective axis of rotation to be dynamically positioned. This dynamic capability enables the system to adapt to different operational requirements while maintaining optimal alignment with stiff component axes to minimize resistance.
Solution Approach 2:
The patent introduces additional dimensional freedom by allowing the movable part to perform both tilting movements about first axes and translational movements along x-axis. This combination of movements in multiple dimensions enables the axis of rotation to be effectively moved to positions closer to the natural axes of stiff components, reducing resistance while maintaining movement freedom through the added translational degree of freedom.
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 approach allows for more precise control of the camera module movements, enhancing optical image stabilization and autofocus capabilities while minimizing interference from stiff components.
Implementation Method 1
a plurality of shape-memory alloy (SMA) wires... on contraction, to (a) tilt the movable part relative to the support structure
Implementation Method 2
The control circuit is electrically connected to the SMA wires for supplying drive signals thereto
Data Source
AI summary
An SMA actuation apparatus (1) comprising: a plurality of SMA wires (71-78) arranged, on contraction, to (a) tilt a movable part (100) relative to a support structure (3) about a first axis (x) and (b) translationally move the movable part relative to the support structure perpendicular to a primary axis (P); and a control circuit electrically connected to the SMA wires for supplying drive signals thereto, and configured to generate drive signals that combine the tilting and the translational movement to cause the movable element to tilt about a second axis (y) that is perpendicular to the primary axis and spaced from the first axis.