Camera Module Lug Preventing Foreign Object Intrusion
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Solution Overview
Problem
Camera modules face challenges in preventing the intrusion of foreign objects, such as dust and inner foreign objects generated during the auto focusing function, which can compromise image quality due to their structural configuration.
Innovation Solution
The camera module design incorporates a holder member with magnets, a bobbin with a coil unit for electromagnetic interaction, and a lug protruding from the bobbin to prevent foreign objects from reaching the IR cut-off filter, along with a dust trap coated on the coil unit and lug, and strategically formed inner yokes and reception grooves to minimize interference and foreign object entry.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera module uses a conventional structure without additional preventing structures, then the device complexity is low, but foreign objects can easily intrude and degrade image quality
Solution Approach 1:
A preventing structure is introduced as an intermediary component between the lens assembly and the IR cut-off filter. This structure includes a preventing protrusion extending from the lens assembly and a corresponding preventing groove in the IR cut-off filter, creating a physical barrier that blocks foreign objects from reaching the filter while maintaining the optical path.
Solution Approach 2:
The preventing structure is segmented into distinct components: a preventing protrusion on the lens assembly side and a preventing groove on the IR cut-off filter side. This segmentation allows each component to be optimized independently for its specific function while working together to prevent foreign object intrusion.
2Object-affected harmful factors
If the camera module structure is simplified, then the manufacturing cost is reduced, but the path length for foreign objects remains short allowing easy intrusion
Solution Approach 1:
The preventing structure extends in a direction perpendicular to the optical axis, creating an additional dimensional barrier. The preventing protrusion and groove are configured to block foreign objects from moving laterally into the IR cut-off filter area, effectively increasing the intrusion path length without adding complexity to the optical path itself.
3Reliability
If the camera module is designed without dust trap structures, then the ease of manufacture is improved, but electromagnetic interference and foreign object generation during auto focusing cannot be prevented
Solution Approach 1:
The preventing structure is designed to be integrated into the assembly process itself, with the preventing protrusion and groove configured to work together from the beginning. This preliminary configuration ensures that foreign objects are blocked before they can cause damage during auto focusing operations, and the structure is designed to be manufactured as part of the standard assembly 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
This configuration enhances electromagnetic efficiency, minimizes foreign object intrusion, and prevents image degradation by increasing the path length for foreign objects, ensuring optimal performance during auto focusing and reducing interference from external shocks.
Implementation Method 1
a bobbin (40) movably mounted inside the holder member (30) to a direction of an optical axis and installed at a periphery with a coil unit (43) to enable an electromagnetic interaction with the magnets
Data Source
AI summary
A camera module includes a PCB (Printed Circuit Board) mounted with an image sensor, and a holder member arranged at an upper surface of the PCB and mounted with a plurality of magnets. The camera module also includes a bobbin movably mounted from an inner side of the holder member to a direction of an optical axis and installed at a periphery with a coil unit to enable an electromagnetic interaction with the magnets, and a lug protrusively formed from a floor surface of bobbin to a direction of external diameter of bobbin to overlap with the floor surface of the holder member for a predetermined section.