Seven-Lens Optical Imaging Assembly Miniaturization
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Solution Overview
Problem
The challenge in designing optical imaging lens assemblies for portable electronic products is to achieve high imaging quality and miniaturization while maintaining design flexibility, as reducing the number of lenses limits design freedom and increases sensitivity to manufacturing errors.
Innovation Solution
An optical imaging lens assembly comprising seven lenses, with specific refractive powers and surface types, and carefully optimized focal lengths, center thicknesses, and radii of curvature, is designed to achieve miniaturization, reduce sensitivity, and correct various aberrations, thereby improving imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of lenses is reduced to achieve miniaturization, then the size of the lens assembly is reduced, but the design freedom and imaging quality deteriorate
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with different refractive powers and characteristics. By segmenting the optical system into multiple functional components (first lens with positive refractive power, second lens with negative refractive power, third lens with positive refractive power, fourth lens with negative refractive power, fifth lens with positive refractive power, sixth lens with negative refractive power, and seventh lens with positive refractive power), the patent achieves both miniaturization and design freedom through optimized segmentation of optical functions.
Solution Approach 2:
The patent employs specific parameter relationships between lens focal lengths to optimize the balance between size and performance. The effective focal lengths are constrained by: f2/|f1|≤0.3, f3/|f2|≥-0.5, f4/|f3|≥-0.5, f5/|f4|≥0.5, f6/|f5|≥0.5, and f7/|f6|≥0.5. These parameter changes enable miniaturization while maintaining design freedom and imaging quality.
2Volume of moving object
If the number of lenses is reduced to achieve miniaturization, then the size of the lens assembly is reduced, but the sensitivity to manufacturing errors increases
Solution Approach 1:
By segmenting the optical system into seven lenses with alternating positive and negative refractive powers, the patent creates a balanced structure that compensates for manufacturing errors. The alternating sign pattern and specific focal length relationships provide error compensation capability, reducing sensitivity to manufacturing variations while maintaining compact size.
Solution Approach 2:
The lens design incorporates error compensation mechanisms built into the optical structure itself. The specific arrangement of positive and negative lenses with constrained focal length ratios creates a system that is inherently more tolerant to manufacturing errors, cushioning against the impact of dimensional variations and surface figure errors before they can degrade image quality.
3Manufacturing precision
If more lenses are added to improve imaging quality, then the imaging performance is improved, but the size and complexity of the lens assembly increase
Solution Approach 1:
The patent optimizes the focal length parameters of the seven lenses to achieve high imaging quality within a compact form factor. The specific constraints on focal length ratios (f2/|f1|≤0.3, f3/|f2|≥-0.5, f4/|f3|≥-0.5, f5/|f4|≥0.5, f6/|f5|≥0.5, f7/|f6|≥0.5) enable the system to deliver superior imaging performance without requiring a large physical size, effectively resolving the contradiction between image quality and compactness.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively shortens the total track length, achieves ultra-thin characteristics, reduces system sensitivity, and corrects aberrations, leading to enhanced imaging quality and stability.
Implementation Method 1
Each of the first lens, the fourth lens, and the fifth lens has a positive refractive power or a negative refractive power. The second lens may have a positive refractive power, and the third lens may have a negative refractive power.
Data Source
AI summary
The present disclosure discloses an optical imaging lens assembly. The optical imaging lens assembly sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens from an object side to an image side along an optical axis. Each of the first lens, the fourth lens, and the fifth lens has a positive refractive power or a negative refractive power. The second lens has a positive refractive power, and the third lens has a negative refractive power. At least one of the sixth lens and the seventh lens has a negative refractive power. An effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy: f2/|f1|<0.5.