Optical Element Drive Mechanism Using Flat Wire Coils for Compact AF/OIS
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Solution Overview
Problem
Existing camera module driving mechanisms struggle to achieve miniaturization while maintaining autofocus and optical image stabilization functions, as they occupy significant space and have inefficiencies in driving efficiency.
Innovation Solution
The use of flat wire coils in the optical element driving mechanism reduces the size of the lens holder and enhances driving efficiency compared to conventional round wire coils, allowing for more compact designs and improved performance in auto-focusing and optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional round wire coils are used in the driving mechanism, then the structure is simple and easy to manufacture, but the area occupied is large and driving efficiency is low
Solution Approach 1:
The patent changes the geometric parameters of the wire coil from round cross-section to flat cross-section. This parameter change reduces the area occupied by the coil while maintaining the same number of turns and electromagnetic performance, directly resolving the contradiction between ease of manufacture and area occupation.
Solution Approach 2:
The invention transitions from a round wire coil occupying circular area to a flat wire coil occupying rectangular area with smaller footprint. This dimensional reconfiguration allows the coil to fit more efficiently within the lens holder, reducing the overall area occupied while maintaining manufacturing simplicity.
2Device complexity
If conventional round wire coils are used in the driving mechanism, then the structure is simple, but driving efficiency is low
Solution Approach 1:
The patent modifies the cross-sectional shape parameter of the wire from circular to rectangular, which increases the surface area for magnetic field interaction. This parameter change improves electromagnetic coupling efficiency and driving efficiency while keeping the overall structure relatively simple and easy to manufacture.
3Volume of moving object
If the lens holder size is reduced for miniaturization, then the camera module achieves compact design, but the driving mechanism performance may deteriorate
Solution Approach 1:
The flat wire coil design allows for increased turn density within a smaller area, maintaining the electromagnetic force required for autofocus and optical image stabilization functions. This parameter change enables lens holder miniaturization while preserving driving mechanism performance through more efficient space utilization.
Solution Approach 2:
The patent employs flat wire construction that combines electrical conductivity with optimized magnetic coupling properties. This composite approach to wire design enables the driving mechanism to maintain reliability and performance in a miniaturized lens holder configuration.
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 implementation of flat wire coils enables a more compact camera module design with improved driving efficiency, effectively addressing the challenges of miniaturization and functional performance in camera modules.
Implementation Method 1
a flat wire coil achieves better driving efficiency than a round wire coil with the same number of turns
Data Source
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AI summary
An optical element driving mechanism is provided and includes a fixed assembly, a movable assembly, and a driving assembly. The movable assembly is configured to be connected to an optical element. The movable assembly is movable relative to the fixed assembly. The optical element has an optical axis. The driving assembly is configured to drive the movable member to move relative to the fixed assembly.