Imaging Lens Assembly Plastic Barrel Annular Surface Compression
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Solution Overview
Problem
Conventional imaging lens assemblies for portable electronic devices face issues with damage to lens and optical elements due to compression forces during assembly, leading to decreased manufacturing efficiency and imaging quality.
Innovation Solution
The imaging lens assembly features a plastic barrel with a first annular surface surrounding an object-side aperture and a plastic lens element with a second annular surface, both parallel and perpendicular to the optical axis, which moderates compression forces and reduces flexural deformation, along with specific distance and thickness conditions to enhance structural integrity and assembly accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If compression force is applied to the fixing ring during assembly, then the optical elements are positioned and fixed, but the lens elements and optical elements suffer damage and cannot recover
Solution Approach 1:
The patent introduces a cushioning structure (elastic element) between the fixing ring and optical elements that absorbs compression force during assembly, preventing direct transmission of damaging forces to the lens elements and optical elements while still achieving proper positioning
Solution Approach 2:
The patent employs an intermediary component (elastic element) that mediates between the fixing ring and optical elements, transferring the positioning function while filtering out harmful compression forces through its elastic properties
2Strength
If the spacer material is made harder to resist deformation, then the structural strength increases, but the manufacturing cost increases and the spacer becomes difficult to form during injection molding
Solution Approach 1:
The patent changes the geometric parameters of the spacer, specifically designing arch-shaped structures and optimized thickness distributions that enable soft PC material to achieve sufficient structural strength without requiring harder materials that would be difficult to mold
Solution Approach 2:
The patent employs curved arch-shaped structures in the spacer design that utilize geometric curvature to enhance structural strength and resistance to flexural deformation, allowing the use of easily moldable soft materials
3Length of stationary object
If additional optical elements are inserted between the first annular surface and the second annular surface, then the optical path is extended, but the assembly complexity increases and the risk of damage to optical elements increases
Solution Approach 1:
The patent extends the optical path length by utilizing the radial dimension through the plastic lens element's thickness rather than adding more elements in the axial direction, thereby achieving extended optical path without increasing assembly complexity
Data Source
AI summary
An imaging lens assembly includes a plastic barrel and an imaging lens set. The plastic barrel includes an object-side aperture and a first annular surface. The imaging lens set includes a plurality of optical elements, wherein at least one of the optical elements is a plastic lens element, and the plastic lens element includes an effective optical portion, a peripheral portion, a second annular surface, and an object-side connecting surface. The peripheral portion is formed around the effective optical portion. The second annular surface is formed on an object-side surface of the plastic lens element and surrounds the effective optical portion. The object-side connecting surface is formed on the object-side surface of the plastic lens element and surrounds the effective optical portion, and the object-side connecting surface is connected with one of the optical elements disposed on an object side of the plastic lens element.