Module Driving Device Using Shape Memory Alloy Wires
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Solution Overview
Problem
Existing optical unit configurations require complex rotation support mechanisms and gimbal mechanisms, leading to a complicated structure.
Innovation Solution
A module driving device with a simpler structure, featuring a module holder, connection member, and driver that utilize shape memory alloy wires to achieve three degrees of freedom movement, including rotation about the optical axis, rocking motions, and translation, eliminating the need for complex support mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a rotation support mechanism and gimbal mechanism are used, then the optical module can achieve multi-degree-of-freedom movement, but the structure becomes complicated
Solution Approach 1:
The patent combines multiple functions (rotation support, gimbal mechanism, and driving functions) into a single integrated movable side member. This member includes a holder for the optical module, a connection member with rotating bodies, and driving members with shape memory alloys, eliminating the need for separate rotation support and gimbal mechanisms while achieving three degrees of freedom movement.
Solution Approach 2:
The patent replaces traditional mechanical driving mechanisms with shape memory alloy-based actuators. The shape memory alloys (first, second, and third shape memory alloys) are used as driving members to achieve rotation and positioning of the movable side member, substituting complex mechanical transmission systems with a more compact and simpler material-based actuation system.
2Manufacturing precision
If a complex rotation support mechanism and gimbal mechanism are used, then the optical module can be precisely positioned, but the device size and component quantity increase
Solution Approach 1:
The patent merges the holder, connection member with rotating bodies, and driving members into a single integrated movable side member. This integration reduces the number of separate components while maintaining the capability for precise three-degree-of-freedom positioning through the coordinated action of shape memory alloys.
Solution Approach 2:
The patent employs a nested structure where the first rotating bodies are disposed inside the movable side member, and the second rotating bodies are disposed inside the first rotating bodies. This nested arrangement allows multiple functional elements to be compactly integrated within a single movable side member, reducing overall component quantity while maintaining positioning precision.
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 provides a more straightforward and efficient mechanism for optical module movement, reducing complexity and enhancing the optical device's structural simplicity while maintaining necessary adjustment functions like autofocus and image stabilization.
Implementation Method 1
A module driving device with a simpler structure, featuring a module holder, connection member, and driver that utilize shape memory alloy wires to achieve three degrees of freedom movement
Data Source
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AI summary
A module driving device (100) includes a module holder (2); a connection member (3) connected to the module holder (2) such that the module holder (2) is rockable about a third rotation axis (RX3) that crosses a direction of an optical axis; a base member (8) connected to the connection member (3) such that the connection member (3) is rockable about a second rotation axis (RX2); and a driver (DM) configured to move the module holder (2) relative to the base member (8). The module holder (2) and the connection member (3) are connected via two first rotating bodies (Q1) that are disposed so as to face each other across the optical axis (OA). The module holder (2) and the connection member (3) connected via the first rotating bodies (Q1) are configured so as to be rotatable relative to each other about the optical axis (OA).