Six-Lens Imaging Assembly for Wide-Angle Low F-Number Correction
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Solution Overview
Problem
Existing imaging lens assemblies for compact devices, such as portable phones and cameras, face challenges in achieving a wide angle and low F-number while minimizing aberrations due to improper design of lens shapes and axial distances, leading to suboptimal performance.
Innovation Solution
The proposed imaging lens assembly consists of six lenses with specific refractive powers and aspherical configurations, along with a glass plate, satisfying certain curvature and focal length conditions to correct aberrations and enable miniaturization, wide-angle capabilities, and low F-number performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is designed for miniaturization with compact structure, then the device size is reduced, but the visual angle becomes narrow and F-number increases
Solution Approach 1:
The lens assembly is divided into six separate lens elements with specific refractive powers arranged in sequence. Each lens contributes to correcting specific aberrations, allowing the system to achieve wide angle and low F-number while maintaining compact size through segmented optical correction rather than a single large lens
Solution Approach 2:
The patent specifies precise parameter ranges for the lens assembly including the ratio of axial distance d11 to focal length f (0.06≤d11/f≤0.15), curvature ratios of lenses (1.40≤(R3+R4)/(R3−R4)≤2.00), and refractive power distributions. These parameter optimizations enable the compact design to achieve wide angle (2ω≥74°) and low F-number (Fno≤2.0) while minimizing aberrations
2Device complexity
If the lens shapes and axial distances are not properly designed, then the structure is simpler, but aberration correction deteriorates
Solution Approach 1:
Each lens element is designed with specific local characteristics - the second and third lenses have negative refractive power with specific curvature ratios to correct chromatic aberration, while the fourth lens with positive or negative refractive power and optimized shape corrects off-axis aberrations. This localized optimization of each lens' properties achieves comprehensive aberration correction without excessive overall complexity
Solution Approach 2:
The patent employs aspherical surfaces for the lenses, particularly specifying the curvature ratios (R3+R4)/(R3−R4) and (R5+R6)/(R5−R6) within defined ranges. The aspherical shapes of the lenses, especially the second, third, and fourth lenses, enable effective correction of spherical aberration and other optical errors while maintaining a relatively simple six-lens structure
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 achieves a wide-angle, miniaturized imaging lens assembly with improved aberration correction, meeting the requirements of a full visual angle of 74° or more and F-number of 2.0 or less, demonstrating good optical performance.
Implementation Method 1
an imaging lens assembly which includes, from an object side to an image side, a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a negative refractive power, a fourth lens having a positive or a negative refractive power, a fifth lens having a positive refractive power, and a sixth lens having a negative refractive power
Data Source
AI summary
An imaging lens assembly includes, arranged in succession from an object side to an image side, a first lens L1 having a positive refractive power, a second lens L2 having a negative refractive power, a third lens L3 having a negative refractive power, a fourth lens L4 having a positive or a negative refractive power, a fifth lens L5 having a positive refractive power, and a sixth lens L6 having a negative refractive power.