Lens Drive Support Structure for AF Feedback Oscillation Control
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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 the performance of AF and OIS functions.
Innovation Solution
A lens driving device with a modified support member structure, 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 structure is used in camera modules with auto focus feedback, then the device can be compact, but oscillation occurs due to natural vibrations of the elastic member
Solution Approach 1:
The support member is designed with non-uniform thickness, where the first portion has a first thickness and the second portion has a second thickness different from the first. This local variation in geometric properties creates different elastic moduli in different regions, allowing the support member to have varying stiffness characteristics that minimize oscillation while maintaining structural support functionality.
2Length of moving object
If spatial restrictions are considered in camera module design, then the device can be compact, but sufficient length for the elastic member cannot be obtained
Solution Approach 1:
The support member extends in multiple directions from the bobbin, including radial and axial dimensions. This multi-dimensional configuration allows the elastic member to achieve sufficient effective length for AF and OIS functions without increasing the overall camera module volume, as the length is obtained through spatial arrangement in multiple dimensions rather than a single linear extension.
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
a support member elastically connecting the bobbin and the housing
Implementation Method 2
an oscillation phenomenon that may occur during the auto focus feedback control
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.