Six-Element Aspheric Optical Lens Aberration Control
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Solution Overview
Problem
In the development of compact optical lenses, there is a challenge in minimizing optical aberrations such as color aberration, field curvature, and distortion while maintaining a compact size and low optical aberration, especially as image sensor sizes decrease and pixel sizes become smaller.
Innovation Solution
The optical lens design incorporates a specific arrangement of symmetrical lens elements with aspheric surfaces and an optical filter, adhering to specific formulas to control aberrations, including the use of aspheric surfaces shaped by a particular mathematical formula and optimized refractive indices and Abbe numbers to reduce color aberration and balance power distribution among lens elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the image sensor size is reduced to make the optical system more compact, then the overall system size is reduced, but the pixel size becomes smaller and color aberration increases
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens element with negative power, second lens element with positive power, third lens element with positive power, fourth lens element with negative power) instead of using a single lens. Each lens element is designed with specific refractive indices and Abbe numbers to independently control different aspects of optical aberration, allowing the system to maintain compact size while correcting color aberration through the combined effect of multiple segmented elements
Solution Approach 2:
The patent employs lens elements made from different materials with specific refractive indices (N1, N2, N3, N4) and Abbe numbers (V1, V2, V3, V4) to form a composite optical system. The fourth lens element uses material with refractive index N4 and Abbe number V4, where the ratio N4/N5 and V4/V5 is controlled to correct color aberration. This composite material approach allows simultaneous achievement of compact form factor and low color aberration by combining materials with complementary optical properties
2Manufacturing precision
If more lens elements are added to reduce optical aberration, then the optical performance is improved, but the device complexity increases
Solution Approach 1:
The patent controls optical aberration by precisely managing parameters such as the ratio of refractive indices (N4/N5, N2/N3) and Abbe numbers (V4/V5, V2/V3) between adjacent lens elements, rather than simply adding more elements. Specific parameter ranges are defined (e.g., 0.85 < N4/N5 < 1.15, 0.30 < V4/V5 < 0.70) to achieve aberration correction with a manageable number of lens elements, thus improving optical performance without excessive complexity
Solution Approach 2:
Each lens element is assigned specific local optical properties (refractive index, Abbe number, power) tailored to its position in the optical system. The first lens element has negative power with specific N1 and V1, the second has positive power with N2 and V2, and so on. This localized optimization of quality parameters allows effective aberration control through coordinated design of individual elements rather than uniform complexity throughout the system
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 controls longitudinal spherical aberration, lateral color aberration, field curvature, and distortion within acceptable ranges, ensuring a compact optical system with improved tolerance sensitivity and reduced aberrations, as demonstrated in the provided graphs and tables.
Implementation Method 1
an optical lens includes, in order from an object side to an image side, a first lens element with negative power having a first aspheric surface and a second aspheric surface, a second lens element with positive power having a third aspheric surface and a fourth aspheric surface
Implementation Method 2
The fourth lens element has a negative power, and the fifth lens element has a positive power
Data Source
AI summary
An optical lens of the present disclosure assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, an optical filter and a sensor. The optical lens also has an axis. The first lens element, the fourth lens element and the sixth lens element have negative power, the second lens element, the third lens element and the fifth lens element have positive power.