Lens Drive Support Structure With Anisotropic Stiffness for AF Stability
Find Innovative SolutionsGenerate Solutions
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 includes a Flexible Printed Circuit Board (FPCB) and lateral support members for electrical connections and power supply.
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 different elastic moduli in different directions: the first support unit (along y-axis) has a lower elastic modulus to reduce oscillation in the direction perpendicular to the optical axis, while the second support unit (along x-axis) has a higher elastic modulus to maintain structural stability. This anisotropic elastic modulus distribution allows the support member to selectively dampen vibrations without requiring additional complex damping components.
2Length of stationary object
If spatial restrictions are considered in camera module design, then the device size is reduced, but the length of the elastic member becomes insufficient
Solution Approach 1:
The support member utilizes the diagonal direction (at 45 degrees to both x-axis and y-axis) as an additional dimensional space. By orienting the first support unit along the y-axis and the second support unit along the x-axis with different elastic moduli, the design effectively uses spatial dimensionality to achieve both sufficient elastic member length and compact camera module area, resolving the contradiction between length requirement and area constraint.
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 and OIS functions by optimizing the support member structure and electrical connections.
Implementation Method 1
a support member elastically connecting the bobbin and the housing
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.