Camera Module Lens Barrel Fixing Structure for Shock Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Camera modules in small-sized electronic devices, such as smartphones, face issues with lens barrel separation or tilting during shock tests, leading to reduced image resolution and quality due to inadequate coupling between the lens barrel and bobbin, and shear forces applied to adhered portions causing damage and assembly errors.
Innovation Solution
Incorporating a fixing part with protrusions or recesses between the lens barrel and bobbin, and using a stepped adhesive area to enhance coupling strength and prevent excessive movement, thereby maintaining the lens barrel's position and reducing adhesive leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the lens barrel is coupled to the bobbin by adhesion only, then the assembly process is simple, but the coupling strength is insufficient causing separation during shock tests
Solution Approach 1:
The patent combines adhesion coupling with mechanical coupling (protrusion-recess structure) to create a hybrid coupling system. The protrusion of the lens barrel fits into the recess of the bobbin, providing mechanical interlocking, while adhesive is applied to the contact surfaces for additional bonding strength. This merged approach resolves the contradiction by maintaining assembly simplicity through a single integrated structure while achieving reliable coupling that prevents separation during shock tests.
Solution Approach 2:
The coupling mechanism uses composite coupling methods combining mechanical (protrusion-recess) and chemical (adhesive) bonding. The protrusion-recess structure provides geometric interlocking, while the adhesive layer adds chemical bonding. This composite approach ensures sufficient coupling strength to withstand shock tests while keeping the manufacturing process relatively simple.
2Reliability
If the lens barrel and bobbin are tightly coupled, then separation is prevented, but shear forces cause damage to adhered portions
Solution Approach 1:
The coupling interface is segmented into multiple functional zones: the protrusion-recess mechanical interlocking zone that handles primary load bearing, and the adhesive bonding zone that provides secondary reinforcement. This segmentation allows each zone to handle specific stress types, reducing the concentration of shear forces on any single point and preventing damage to adhered portions.
Solution Approach 2:
The protrusion-recess mechanical coupling structure acts as a cushioning element that absorbs and distributes shock loads before they reach the adhesive bonding areas. This beforehand cushioning prevents excessive shear forces from damaging the adhered portions during shock tests while maintaining coupling stability.
3Reliability
If adhesive is applied extensively to ensure bonding, then coupling strength increases, but adhesive leakage occurs causing assembly errors
Solution Approach 1:
The adhesive is applied locally only to specific contact surfaces between the lens barrel protrusion and bobbin recess, rather than extensively across all surfaces. This localized adhesive application provides sufficient bonding strength at the critical coupling interface while preventing adhesive leakage that would cause assembly errors. The protrusion-recess structure confines the adhesive to the necessary areas.
Data Source
AI summary
One embodiment of a camera module comprises: a lens barrel including at least one lens; a bobbin for accommodating the lens barrel; and a fixing part disposed between the lens barrel and the bobbin so as to inhibit the lens barrel from being separated from the bobbin, wherein one surface, which makes surface contact with the fixing part, of the bobbin can include a bobbin provided so as to protrude toward the lens barrel.