Lens Driving Module Elastic Support Structure for Tilt Control
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Solution Overview
Problem
Conventional camera modules with auto focus and Optical Image Stabilization (OIS) functions face issues such as static tilt due to leg bending, twisting of elastic members during assembly, and increased operation time due to complex coupling processes.
Innovation Solution
A lens driving device with a novel structure featuring a bobbin, housing, and elastic members with specific configurations to minimize twisting and static tilt, including a bottom elastic member with multiple outer and inner portions connected by elastic portions, and a guide portion to prevent rotation and short-circuiting, thereby simplifying assembly and reducing assembly time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional elastic members with multiple legs are used in camera modules, then the auto focus and OIS functions can be implemented, but static tilt occurs due to leg bending during manufacturing processes
Solution Approach 1:
The elastic member is divided into multiple legs (first leg, second leg, third leg, fourth leg) that are independently disposed. Each leg is separately coupled to the bobbin and housing, allowing individual control and compensation of bending forces. This segmentation enables the structure to maintain stability while accommodating manufacturing variations in each individual leg.
2Reliability
If multiple lateral support units are inserted into separate holes for OIS function, then optical image stabilization can be achieved, but assembly time increases due to complex coupling processes
Solution Approach 1:
The lateral support units are integrated into a single unified structure that is coupled to the bobbin and housing as one piece. This merging of multiple separate support units into a single integrated component maintains the OIS functionality while significantly reducing the number of assembly steps and coupling operations required.
3Stability of the object's composition
If elastic members are coupled to housing through fusing process, then structural stability is achieved, but twisting of elastic member occurs during coupling
Solution Approach 1:
The elastic member is designed with different structural characteristics at different locations. The legs have specific cross-sectional shapes and thicknesses optimized for their local functions, while the connection portions have enhanced rigidity and anti-twisting features. This local quality differentiation allows the structure to maintain stability through fusing while minimizing twisting during the coupling process.
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 static tilt and twisting of elastic members, reduces assembly time, and prevents short-circuiting, leading to improved manufacturing efficiency and camera module performance.
Implementation Method 1
an elastic member disposed at an upper side of the bobbin to be coupled to the bobbin and the housing
Data Source
AI summary
The present embodiment relates to a lens driving device comprising: a housing; a bobbin disposed inside the housing; and a lower elastic member provided on the lower side of the bobbin and coupled to the bobbin and to the housing, wherein the lower elastic member comprises a first outer portion, which is coupled to the housing, a second outer portion, which is coupled to the housing and is spaced from the first outer portion, a first inner portion, which is coupled to the bobbin, a second inner portion, which is coupled to the bobbin and is spaced from the first inner portion, a first elastic portion, which connects the first outer portion and the first inner portion, a second elastic portion, which connects the second outer portion and the second inner portion, and an inner connecting portion, which connects the first inner portion and the second inner portion.