Lens Driving Module Layout for Compact Autofocus Cameras
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Solution Overview
Problem
The challenge is to reduce the size of lens driving modules in electronic devices with camera or video functions while maintaining autofocus functionality, as increased display sizes require a more compact lens driving mechanism.
Innovation Solution
The optical member driving mechanism includes a fixed portion with a main axis and a polygonal structure, a movable portion with a holder for the optical member, a driving assembly using a magnetic element and driving coil, and a sensing assembly to detect movement, with a circuit assembly embedded in the housing to facilitate miniaturization and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display size is increased to meet user requirements, then the user experience is improved, but the size of the lens driving module needs to be reduced
Solution Approach 1:
The circuit assembly is embedded within the housing structure, with circuit boards positioned in recesses and grooves of the housing. This nesting approach allows the circuit components to occupy space within the existing housing volume rather than adding to the external dimensions, effectively reducing the overall lens driving module size while maintaining all necessary autofocus functions
Solution Approach 2:
The patent utilizes three-dimensional space optimization by positioning components at different vertical levels (along the main axis) and arranging circuit boards in multiple layers. The housing includes grooves and recesses that accommodate circuit boards at different positions, transforming a two-dimensional layout problem into a three-dimensional space utilization solution that reduces the module's footprint
2Ease of manufacture
If the circuit assembly is embedded in the housing, then the manufacturing complexity is reduced, but the assembly precision requirements increase
Solution Approach 1:
The housing is pre-formed with integrated grooves, recesses, and positioning structures during the housing manufacturing process. These pre-formed features serve as built-in guides and mounting locations for the circuit boards, eliminating the need for separate assembly steps to create mounting structures and reducing the complexity of the overall assembly process
Solution Approach 2:
The housing structure itself provides the positioning and support functions for the circuit assembly through its integrated grooves and recesses. The housing acts as its own fixture and mounting structure, eliminating the need for additional complex assembly mechanisms and reducing precision requirements by using the housing's inherent geometry to guide component placement
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 allows for the miniaturization of the optical member driving mechanism, reducing the size of the lens driving module while maintaining autofocus functionality and simplifying the assembly process, thereby meeting market demands for smaller electronic devices.
Implementation Method 1
the driving assembly includes a magnetic element and a driving coil. Of the magnetic element and the driving coil, one is disposed on the fixed portion, and the other is disposed on the movable portion
Data Source
AI summary
An optical member driving mechanism is provided. The optical member driving mechanism includes a fixed portion, a movable portion, a driving assembly and a circuit assembly. The fixed portion has a main axis and a polygonal structure surrounding the main axis. The movable portion is configured to connect an optical member, and is movable relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion. The circuit assembly is electrically connected to the driving assembly.