Six-Lens Optical Imaging System with Inflection Points
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Solution Overview
Problem
Small camera modules with optical imaging systems using four or less lenses face challenges in achieving high performance due to high f-numbers, making it difficult to integrate them into thin mobile devices while maintaining image quality.
Innovation Solution
An optical imaging system comprising six lenses sequentially arranged from the object side, where at least two lenses have inflection points, and the second lens has a higher refractive index than the other lenses, allowing for a lower f-number and improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If four or less lenses are used in the optical imaging system, then the camera module can be made thinner, but the f-number becomes high and image quality deteriorates
Solution Approach 1:
The optical imaging system is divided into six distinct lens elements with specific refractive powers and Abbe numbers. Each lens element (L1-L6) has optimized curvature radii and thicknesses to collectively achieve low f-number while maintaining compact form factor. The segmentation allows distribution of optical correction functions across multiple elements.
Solution Approach 2:
The patent employs precise parameter optimization including refractive indices (e.g., L2 has n>1.6, L4 has 1.5<n<1.7), Abbe numbers (e.g., 30<V4<60, V5-V4=20-40), curvature radii ratios (e.g., -0.5<r1/r2<0.2), and thickness ratios (e.g., 0.1<d1/d2<0.5) to achieve both low f-number and thin profile simultaneously.
2Device complexity
If four or less lenses are used in the optical imaging system, then the device complexity is reduced, but the manufacturing precision requirements increase to maintain performance
Solution Approach 1:
The system uses six lens elements with clearly defined optical functions. Each element has specific refractive power signs and Abbe number ranges that distribute the optical correction burden, reducing individual manufacturing precision requirements while achieving overall high performance.
Solution Approach 2:
The patent specifies parameter ranges (e.g., refractive index ranges, Abbe number ranges, curvature ratios) that provide manufacturing tolerance windows. These parameter specifications enable mass production with controlled precision requirements while maintaining optical performance.
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 optical imaging system achieves a low f-number of less than 2, enabling high-performance imaging in small camera modules while maintaining a thin form factor.
Implementation Method 1
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object side
Data Source
AI summary
An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens sequentially arranged from an object side. At least two of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens include at least one inflection point. An object-side surface of the sixth lens is concave.