Lens Driving Module Structure for Adhesive Overflow and OIS Shock
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Solution Overview
Problem
Conventional camera modules face challenges in miniaturization and high pixelation, and issues such as adhesive overflow causing short-circuits and characteristic changes in sensing magnets due to UV beams, as well as shocks from collisions in OIS movers.
Innovation Solution
The lens driving device incorporates a bobbin with a recessed design to prevent adhesive overflow, a staircase portion to manage adhesive flow, and a cushioning stopper to absorb shocks, while maintaining the integrity of sensing magnets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If adhesive member is discharged to fix the support member to the circuit substrate, then the support member is securely fixed, but the adhesive member overflows over the hole of the circuit substrate causing short-circuit
Solution Approach 1:
The base is segmented into multiple functional regions: a discharge recess for controlled adhesive discharge, a first recess to collect overflow adhesive, and a staircase portion to guide adhesive flow. This segmentation prevents adhesive from reaching the hole and causing short-circuit while ensuring secure fixing of the support member.
2Volume of moving object
If the camera module is miniaturized to reduce size, then portability is improved, but adhesive overflow and short-circuit risks increase
Solution Approach 1:
The solution introduces vertical dimensionality through multi-level recess structures (discharge recess, first recess, staircase portion) on the base. These vertically stacked features control adhesive flow paths in the Z-direction, preventing lateral overflow onto the circuit substrate hole while maintaining a compact overall footprint.
3Strength
If UV beams are irradiated to cure adhesives, then bonding strength is improved, but characteristic changes in sensing magnet occur
Solution Approach 1:
The design extracts the sensing magnet from the direct path of UV beam irradiation by positioning it away from the adhesive discharge and curing zone. The base structure with its recesses creates a spatial separation that allows UV curing of adhesives without exposing the sensing magnet to harmful UV exposure, thus maintaining magnet characteristics while achieving strong bonding.
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
Prevents short-circuits and adhesive overflow, maintains magnet characteristics, and reduces shock impact on OIS movers, enhancing the reliability and performance of miniaturized camera modules.
Implementation Method 1
characteristic changes in a sensing magnet for autofocus feedback have been generated in the conventional camera devices by heat caused by UV beams irradiated in the course of curing adhesives
Implementation Method 2
a cushioning stopper coupled to an outer lateral surface of the housing corresponding to the lateral plate of the cover member, wherein the cushioning stopper may be interposed between the lateral surface of the housing and the lateral plate of the cover member
Data Source
AI summary
A camera device including a housing, a bobbin disposed in the housing, a first coil and a first magnet configured to perform an auto focus driving by moving the bobbin in an optical axis direction, a second coil configured to perform an optical image stabilization driving, an upper elastic member connecting the housing and the bobbin, a second magnet disposed on the bobbin, and a sensor configured to sense the second magnet. In addition, the bobbin includes a recess disposed with the second magnet, and the upper elastic member includes an inner portion coupled with the bobbin, an outer portion coupled with the housing, and a connection portion connecting the inner portion and the outer portion. Furthermore, the inner portion of the upper elastic member includes a first region overlapped with the second magnet in the optical axis direction.