Five-Lens Optical Assembly with Aspheric Surfaces for Wide Field of View
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Solution Overview
Problem
Current lens assemblies fail to simultaneously achieve a large field of view, miniaturization, and high resolution while maintaining good optical performance.
Innovation Solution
A lens assembly comprising a specific arrangement of five lenses with varying refractive powers and surface curvatures, including aspheric surfaces, optimized by conditions such as focal lengths and radius of curvature ratios to enhance field of view, resolution, and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the lens assembly uses conventional structure, then the manufacturing and design are simpler, but the field of view is limited and resolution is insufficient
Solution Approach 1:
The lens assembly is divided into five distinct lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) with different refractive powers and surface curvatures. Each lens element is optimized independently with specific aspheric surface coefficients, allowing the system to achieve a wide field of view (90 degrees) and high resolution while managing complexity through modular design
Solution Approach 2:
The patent introduces aspheric surfaces with complex mathematical formulations (including higher-order terms like h^4, h^6, h^8) to describe lens surface geometry. This dimensional complexity in surface shaping enables light rays from wide angles to be properly focused, achieving both large field of view and high resolution that conventional spherical surfaces cannot provide
2Measurement precision
If the lens assembly is designed for high resolution and large field of view, then the optical performance improves, but the total lens length increases
Solution Approach 1:
The patent optimizes specific parameter relationships between lens elements to achieve compact design. Key parameters include the focal lengths (f1, f2, f3, f4, f5) and their ratios, the radii of curvature (R11, R12, R21, R22, etc.) of aspheric surfaces, and the thicknesses (d1, d2, d3, d4, d5) of each lens element. By carefully controlling these parameters and their relationships, the system achieves high resolution and wide field of view within a shortened total length
Solution Approach 2:
The five lens elements are arranged in a compact nested configuration along the optical axis, with each subsequent lens positioned to optimize the overall optical path. The aspheric surfaces of adjacent lenses are designed to work together, with their curvature radii and thicknesses coordinated to minimize the total axial length while maintaining high resolution performance across the wide field of view
3Reliability
If the lens assembly uses more lens elements with optimized surfaces, then the optical performance and resolution improve, but the manufacturing difficulty increases
Solution Approach 1:
The patent employs aspheric surfaces on all lens elements, replacing conventional spherical surfaces. Each aspheric surface is defined by mathematical equations including conic constants and higher-order coefficients (A4, A6, A8, A10, A12). This curvature optimization enables superior optical performance and correction of aberrations, though it increases manufacturing complexity compared to spherical surfaces
Solution Approach 2:
The manufacturing difficulty is managed by optimizing specific parameter relationships that balance performance and manufacturability. The patent specifies focal length ratios (e.g., f3/f1, f4/f1), curvature radius ratios (e.g., R11/R12, R21/R22), and thickness ratios (e.g., d3/d1, d4/d1) that achieve high optical performance while providing guidance for manufacturing processes
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 lens assembly achieves a larger field of view, shortened total lens length, higher resolution, and improved optical performance by satisfying specific conditions related to focal lengths and surface curvatures, effectively addressing the limitations of existing designs.
Implementation Method 1
The first lens is with positive refractive power and includes a concave surface facing the image side. The second lens is with positive refractive power and includes a concave surface facing the object side. The third lens is with negative refractive power. The fourth lens is with positive refractive power. The fifth lens is with negative refractive power.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are arranged in order from an object side to an image side along an optical axis. The first lens is with positive refractive power and includes a concave surface facing the image side. The second lens is with positive refractive power and includes a concave surface facing the object side. The third lens is with negative refractive power. The fourth lens is with positive refractive power. The fifth lens is with negative refractive power. The lens assembly satisfies: f3+f4>0 mm, wherein f3 is an effective focal length of the third lens and f4 is an effective focal length of the fourth lens.