Imaging Lens Module Wiring Sheet for Stable AF and OIS Motion
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Solution Overview
Problem
The challenge in the field of imaging lens driving modules for portable electronic devices is to enhance structural strength while maintaining functionality, particularly in auto-focusing and optical image stabilization processes.
Innovation Solution
The imaging lens driving module incorporates a resilience wiring sheet with meandering branches and a driving unit comprising coils and magnetic elements, allowing the lens carrier to move relative to the frame element, while the resilience wiring sheet absorbs dragging forces, enhancing mechanical strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a rigid wiring sheet is used to connect the lens carrier and wiring substrate, then structural strength is improved, but the ability to absorb dragging forces during lens movement is reduced
Solution Approach 1:
The wiring sheet is designed with flexible characteristics to absorb dragging forces during lens carrier movement. The wiring sheet includes an elastic portion with meandering branches that can deform elastically, allowing the system to maintain both structural integrity and flexibility for force absorption.
Solution Approach 2:
The wiring sheet's physical parameters are optimized by controlling the ratio of elastic portion length to total length (0.2-0.8), and by designing the meandering branch structure. This allows the wiring sheet to achieve optimal balance between strength and flexibility for absorbing dragging forces during operation.
2Reliability
If the elastic portion is made longer to absorb more dragging force, then stability is improved, but the space occupied increases
Solution Approach 1:
The elastic portion utilizes meandering branches that extend in directions other than the primary optical axis direction. This allows the elastic portion to absorb dragging forces effectively while occupying minimal space along the critical optical path, as the meandering structure absorbs force in lateral dimensions.
Solution Approach 2:
The ratio of elastic portion length to total wiring sheet length is controlled within 0.2-0.8 to optimize the balance between stability and space occupation. The meandering branch configuration further optimizes space utilization while maintaining adequate elastic deformation capacity.
3Volume of moving object
If the meandering branches are made thinner to reduce space, then compactness is improved, but the mechanical strength is reduced
Solution Approach 1:
The wiring sheet is constructed as a composite structure with a substrate and an elastic portion formed thereon. This composite design allows the thin meandering branches to maintain adequate mechanical strength through the combination of substrate support and elastic material properties, achieving both compactness and strength.
Solution Approach 2:
The elastic portion with meandering branches is designed as a thin flexible structure that can maintain sufficient mechanical strength through its geometric configuration and material properties. The meandering shape provides structural reinforcement while maintaining thin profile for compactness.
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 improves the mechanical strength and stability of the imaging lens driving module, enabling effective auto-focusing and optical image stabilization by effectively absorbing dragging forces during movement.
Implementation Method 1
The ball set is disposed between the lens carrier and the frame element, wherein the ball set is physically contacted with the lens carrier and the frame element
Implementation Method 2
the elastic portion includes at least two meandering branches and a node. The at least two meandering branches extend in a direction towards the fixed end, the at least two meandering branches overlap each other in a specific direction in view, and the at least two meandering branches extend in the direction towards the fixed end and converge at the node
Implementation Method 3
the driving unit is configured to drive the lens carrier to move relative to the wiring substrate in a direction parallel to the optical axis or in a direction perpendicular to the optical axis, and the driving unit includes a first coil, a second coil and a first magnetic element
Data Source
AI summary
An imaging lens driving module includes an imaging lens assembly, a lens carrier, a frame element, a ball set, a wiring substrate, a resilience wiring sheet and a driving unit. The lens carrier is configured to install the imaging lens assembly, the frame element is disposed corresponding to the lens carrier, the ball set is disposed between the lens carrier and the frame element, the wiring substrate is disposed on an image side of the imaging lens assembly, and the resilience wiring sheet is configured to connect the lens carrier and the wiring substrate. The resilience wiring sheet includes a movable end, a fixed end, a connecting portion, an elastic portion and a principal constraint component. The elastic portion includes at least two meandering branches and a node. The driving unit includes a first coil, a second coil and a first magnetic element.