Light Blocking Sheet Asymmetry for Lens Module Assembly Precision
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Solution Overview
Problem
Conventional lens modules face challenges in precision assembly and manufacturing due to the miniaturization of lens elements and optical components, leading to increased complexity and the risk of misassembly, which affects the quality and efficiency of imaging lenses.
Innovation Solution
A light blocking sheet with a unique design featuring alternating notches and arc surfaces on its outer annular surface, which helps in determining the correct assembly direction and prevents misassembly by providing distinct features for alignment, thereby enhancing the precision of the assembling process and reducing light leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the sizes of lens elements and optical elements are reduced to achieve miniaturization, then the portability and compactness of imaging devices are improved, but the precision of manufacturing and assembling processes deteriorates
Solution Approach 1:
The outer annular surface of the light blocking sheet is designed with asymmetric features including notches and arc surfaces with different arc lengths. These asymmetric structures create unique alignment cues that guide the correct positioning of the light blocking sheet relative to lens elements during assembly, thereby maintaining high assembly precision despite the miniaturization of the overall lens module
Solution Approach 2:
The notches and arc surfaces are pre-formed on the light blocking sheet during manufacturing. These pre-formed features serve as built-in alignment guides that automatically indicate the correct assembly direction and position, eliminating the need for complex alignment procedures during the assembly process and ensuring precise positioning even in miniaturized configurations
2Ease of manufacture
If conventional light blocking sheets without specific alignment features are used, then the manufacturing process is simple, but misassembly occurs during the assembling process
Solution Approach 1:
The asymmetric arrangement of notches and arc surfaces with different arc lengths on the outer annular surface creates unmistakable alignment cues. These features make it visually and physically obvious how the light blocking sheet should be positioned, effectively preventing misassembly while adding minimal complexity to the manufacturing process
Solution Approach 2:
The varying arc lengths of the arc surfaces create distinct geometric patterns that serve as visual indicators for correct orientation. These geometric 'color' variations (in terms of shape and size) provide clear feedback to assemblers about the correct positioning, reducing the risk of misassembly
Data Source
AI summary
A light blocking sheet includes a first surface, a second surface, an inner annular surface and an outer annular surface. The second surface is corresponding to the first surface. The inner annular surface connects the first surface and the second surface, and forms an inner opening. The outer annular surface connects an edge of the first surface and an edge of the second surface, and includes at least three notches disposed on the outer annular surface and at least three arc surfaces located on the outer annular surface, wherein the at least three notches and the at least three arc surfaces are alternately arranged on the outer annular surface, and the at least three arc surfaces are coaxial and have different arc lengths.