Lens Module Fastening Structure to Prevent Barrel Loosening
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Solution Overview
Problem
Existing lens manufacturing processes face issues with lens loosening during assembly due to non-contact fastening, affecting yield and performance.
Innovation Solution
A lens module design featuring a lens holder with fastening portions, including upper and lower fastening protrusions and a fastening blade, where the lower protrusion has a stepped portion to prevent reverse rotation and the blade is constrained by these protrusions, ensuring secure fastening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a non-contact fastening manner is used to attach the lens barrel to the lens holder, then the manufacturing process is simplified and assembly efficiency is improved, but the lens may loosen during movement and between operations, affecting yield and performance
Solution Approach 1:
The fastening structure is divided into multiple functional components: a fastening blade with protrusion portion, upper fastening protrusion with locking protrusion, lower fastening protrusion with stepped portion, and support portion. Each segment performs a specific function in the fastening sequence, allowing the system to achieve both ease of assembly and reliable locking through modular design
Solution Approach 2:
The fastening blade is preliminarily positioned between the upper and lower fastening protrusions before final locking occurs. The support portion and stepped portion are pre-configured to guide and constrain the fastening blade, ensuring that when assembly occurs, the components automatically engage in the correct sequence to prevent loosening
2Device complexity
If a simple fastening structure is used to reduce device complexity, then manufacturing cost is reduced and assembly is simplified, but the lens barrel may rotate or loosen during operation
Solution Approach 1:
The fastening structure employs asymmetric design elements: the stepped portion has different heights on different sides, the locking protrusion and protrusion portion have complementary asymmetric shapes, and the support portion is positioned offset from the center. This asymmetry creates a unidirectional locking mechanism that prevents rotation in the loosening direction while maintaining simplicity
Solution Approach 2:
The fastening mechanism transitions from a single-plane engagement to a multi-dimensional constraint system. The fastening blade moves in both optical axis direction and circumferential direction, while the stepped portion and locking protrusion engage in different spatial planes, creating stable positioning through three-dimensional geometric constraints rather than simple single-plane fastening
Data Source
AI summary
A lens module includes a lens barrel in which a plurality of lenses are disposed, and a lens holder to which the lens barrel is coupled, wherein the lens holder includes a fastening portion fastening the lens barrel, the lens barrel includes a fastening blade coupled to the fastening portion of the lens holder, and the fastening portion includes a stepped portion preventing rotation in a direction, opposite to a direction in which the fastening blade rotates for fastening.