Lens Module Shape Memory Alloy Actuation Circuit Integration
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Solution Overview
Problem
Existing optical image stabilization systems face challenges in miniaturization and complex assembly due to the use of shape memory alloy (SMA) wire-based actuating devices, which complicate circuit arrangement and overall design miniaturization, especially in image pickup optical systems.
Innovation Solution
A lens module design featuring a frame with oppositely arranged side walls, a driving device using shape memory alloy wires with ends connected to the frame and electrically fixed through wire clips on a circuit board, and an autofocusing mechanism with a second circuit board and conductive wires, allowing for miniaturization and simplified assembly by symmetrically arranging SMA wires around the lens base and using hook parts and suspending wires for support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shape memory alloy wires are used for optical image stabilization, then image stabilization function is achieved, but circuit arrangement difficulty increases and miniaturization becomes difficult
Solution Approach 1:
The patent combines the support function and electrical connection function into a single wire clip component. The wire clips are arranged on the frame, clamped between the frame and first circuit board, and simultaneously fix the ends of shape memory alloy wires while providing electrical connection through the wire clips to the first circuit board. This merging reduces the number of separate components and simplifies circuit arrangement.
Solution Approach 2:
The wire clips serve multiple functions: mechanical support for the shape memory alloy wires, electrical connection to the circuit board, and structural integration with the frame. This multi-functionality reduces overall device complexity while maintaining the image stabilization function.
2Reliability
If shape memory alloy wires are fixed between movable device and support device through various crimp elements, then reliable connection is achieved, but assembly difficulty increases
Solution Approach 1:
The wire clips integrate the crimping/fixing function with the electrical connection function into a single component. The wire clips are clamped between the frame and first circuit board to fix the ends of shape memory alloy wires, eliminating the need for separate crimp elements and reducing assembly steps.
Solution Approach 2:
The wire clips are designed to be self-fixing through the clamping structure between the frame and circuit board. The crimping action and electrical connection are achieved simultaneously through the same component without requiring additional assembly operations.
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 design achieves miniaturization and simplifies assembly by facilitating circuit routing and power supply, enabling efficient image stabilization and autofocusing functions while maintaining structural reliability and optical axis alignment.
Implementation Method 1
The driving device includes shape memory alloy wires each being provided with two ends connected to the frame, and a driving end positioned between the two ends
Data Source
AI summary
The invention says a lens module including a frame, a first circuit board arranged on the frame, a lens base for mounting a lens, a support device for supporting the lens base on the first circuit board, and a driving device connected between the first circuit board and the lens base. The frame includes oppositely arranged first side walls and oppositely arranged second side walls connected between the first side walls. The driving device includes shape memory alloy wires each being provided with two ends connected to the frame, and a driving end positioned between the two ends. The driving ends are supported on the lens base. The lens module said by the invention can further achieve miniaturization on the basis of reducing the difficulty in product assembly.