Lens Driving Support Structure for AF Feedback Resonance Suppression
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Solution Overview
Problem
Conventional camera modules with auto focus feedback functions suffer from oscillation due to natural vibrations and have spatial restrictions that limit the length of elastic members, affecting their performance in AF and OIS functions.
Innovation Solution
A lens driving device with a modified support member design, including a bobbin, housing, and sensors, where the support member has varying elastic moduli and orientations to minimize oscillation, and a camera module with a long and wide elastic member to secure AF or OIS function performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional support member is used in a camera module with auto focus feedback, then the structure is simple, but oscillation occurs due to natural vibrations
Solution Approach 1:
The support member is designed with different elastic moduli in different directions: the first support unit (along y-axis) has a lower elastic modulus to reduce oscillation impact on the sensor, while the second support unit (along x-axis) has a higher elastic modulus to maintain structural stability. This anisotropic design allows the same component to simultaneously achieve vibration reduction and structural integrity.
Solution Approach 2:
The support member采用非对称设计，第一支撑单元和第二支撑单元不仅弹性系数不同，而且与光轴的夹角也不同（第一夹角α1小于第二夹角α2）。这种不对称结构使得支撑成员能够在不同方向上提供差异化的支撑特性，有效抑制振荡的同时保持整体稳定性。
2Volume of moving object
If spatial restriction is considered in camera module design, then the overall size is reduced, but the length of elastic member becomes insufficient
Solution Approach 1:
The elastic member is designed with a three-dimensional configuration that includes both horizontal and vertical components. By utilizing the vertical dimension (height direction) in addition to the horizontal plane, the effective length of the elastic member is increased without proportionally increasing the footprint area of the camera module. This allows sufficient elastic member length for AF and OIS functions while maintaining compact overall dimensions.
Solution Approach 2:
The support member with varying elastic moduli is integrated within the compact housing structure, nesting the vibration reduction function within the existing spatial constraints. The first and second support units are arranged at different orientations and positions, allowing them to work together in a nested configuration that maximizes the use of available space.
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 effectively minimizes oscillation during auto focus feedback control and ensures stable performance of AF or OIS functions by adjusting the elastic modulus and orientation of support members, inhibiting oscillation at resonance points.
Implementation Method 1
the support member may include a first support unit, and a second support unit disposed not parallel to the first support unit... an elastic modulus of the first support unit may be lower than an elastic modulus of the second support unit
Implementation Method 2
the conventional camera module having the auto focus feedback function suffers from disadvantages in that an elastic member oscillates when an external force corresponding to a natural vibration frequency of the elastic member is applied
Data Source
AI summary
A lens driving device is provided, the lens driving device includes: a housing; a bobbin disposed inside of the housing; a support member coupled to the bobbin and the housing; and a sensor sensing a position of at least one of the bobbin and the housing, wherein the support member may include a first support unit, and a second support unit disposed not parallel to the first support unit, wherein the sensor may be disposed more adjacent to the first support unit than to the second support unit, and wherein an elastic modulus of the first support unit may be lower than an elastic modulus of the second support unit.