Camera Module Coupling Structure to Keep Debris Off Image Sensors
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Solution Overview
Problem
Conventional camera modules face issues with foreign substances falling onto the image sensor due to thread structures on the lens holder and front body, leading to assembly defects and poor waterproofing.
Innovation Solution
A camera module design that alters the screw thread coupling structure by positioning the coupling parts away from the image sensor and uses epoxy to fix the lens holder to the front body, eliminating the O-ring application and enhancing waterproofing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thread structures are formed on the outer circumferential surface of the lens holder and inner circumferential surface of the front body for coupling, then the lens holder can be securely fixed to the front body, but foreign substances are generated during assembly or by vibration, leading to black pixel defects on the image sensor
Solution Approach 1:
The patent extracts the harmful thread structure from the coupling interface between the lens holder and front body. Instead of using threads on the lens holder outer surface and front body inner surface, the invention uses a projection structure on the lens holder that fits into a corresponding groove on the front body, eliminating the source of foreign substance generation while maintaining secure fixation
Solution Approach 2:
The coupling structure is segmented into distinct functional elements: a projection structure with first and second coupling surfaces on the lens holder, and a corresponding groove with matching surfaces on the front body. This segmentation allows each surface to be optimized for its specific function (fixing or sealing) without the complications of threaded structures
2Strength
If thread structures are used for coupling the lens holder and front body, then mechanical fixation is achieved, but assembly becomes complex and waterproofing deteriorates due to foreign substances introduced into the O-ring
Solution Approach 1:
The patent removes the complex threaded coupling mechanism and replaces it with a simpler projection-groove fit structure. The first coupling surface and second coupling surface provide mechanical fixation without requiring threads, significantly simplifying the assembly process while maintaining strong mechanical connection
Solution Approach 2:
The invention merges the mechanical fixation function and waterproof sealing function into a single integrated coupling structure. The projection-groove interface simultaneously provides both mechanical strength and a pathway for the waterproof O-ring, eliminating the need for separate threaded fasteners and simplifying the overall assembly
3Strength
If thread structures are formed on coupling surfaces, then the lens holder can be fixed to the front body, but foreign substances are generated that are introduced into the waterproof O-ring, causing poor waterproofing
Solution Approach 1:
The patent extracts the harmful thread structure from the waterproof coupling interface and replaces it with a smooth projection-groove fit. This eliminates the source of foreign substances that would otherwise contaminate the waterproof O-ring and compromise sealing reliability
Solution Approach 2:
The invention applies different surface qualities to different regions of the coupling structure: the first and second coupling surfaces are designed for mechanical fixation with appropriate roughness or treatment, while the third and fourth coupling surfaces that contact the waterproof O-ring are designed with smooth finishes to prevent foreign substance generation and ensure reliable waterproofing
Data Source
AI summary
A camera module includes a first body, a lens holder coupled to the first body, and a second body coupled to the first body. The lens holder includes a first coupling part protruded from an outer peripheral surface of the lens holder. The first body includes a second coupling part coupled to the first coupling part, a first protruded portion protruded from an upper surface of the first body, and a first groove formed between the second coupling part and the first protruded portion. A fixing member is disposed in the first groove of the first body. The fixing member includes a body disposed in the first groove of the first body and an extension portion extended from at least a portion of the body. The extension portion of the fixing member is disposed between an inner peripheral surface of the first coupling part and an outer peripheral surface of the second coupling part.