Five-Lens Optical System Reducing Chromatic Aberration Without Fluorite
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Solution Overview
Problem
Current optical imaging systems, particularly indoor surveillance and vehicle-mounted front imaging systems, face challenges in achieving high resolution, minimal distortion, and large aperture while being cost-effective and environmentally friendly, as they often rely on complex and expensive fluorite lenses that are fragile and difficult to manufacture.
Innovation Solution
A five-piece optical lens design using regular materials like glass or plastic, featuring a combination of lenses with specific refractive indices and aspherical surfaces, which reduces aberrations and maintains imaging quality across a wide temperature range without the need for precise components or complex structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If fluorite lenses are used to achieve good imaging effect, then imaging quality is improved, but manufacturing cost increases and environmental pollution occurs
Solution Approach 1:
The patent replaces expensive fluorite lenses with ordinary optical glass lenses that can be manufactured at lower cost. The invention uses a multi-lens configuration (first lens, second lens, third lens, fourth lens, and fifth lens) where each lens is made of conventional materials, eliminating the need for costly fluorite while maintaining imaging quality through optimized optical design
Solution Approach 2:
The patent employs composite optical design by combining multiple lenses made of different ordinary optical glass materials with varying refractive indices and Abbe numbers. This composite approach allows correction of chromatic aberration and other optical defects without requiring fluorite, achieving good imaging quality through material diversity rather than relying on expensive single-material lenses
2Manufacturing precision
If fluorite lenses are used to achieve good imaging effect, then imaging quality is improved, but the lens becomes fragile and unsuitable for harsh environments
Solution Approach 1:
The patent substitutes fragile fluorite lenses with durable ordinary optical glass lenses that can withstand harsh environmental conditions including extreme temperatures (-40°C to +85°C). The conventional glass materials used in the five-lens configuration are mechanically stronger and more resistant to thermal shock and physical damage compared to fluorite
Solution Approach 2:
The patent extracts and eliminates the fluorite material from the optical system entirely, replacing it with a multi-lens configuration using only ordinary optical glass. This removal of the fragile fluorite component while maintaining the optical function through alternative design achieves both imaging quality and environmental durability
3Object-generated harmful factors
If single achromatic lens is used to reduce chromatic aberration, then chromatic aberration is reduced, but other aberrations cannot be reduced and imaging effect deteriorates
Solution Approach 1:
The patent divides the optical system into five separate lenses instead of using a single achromatic lens. Each lens (first lens L1, second lens L2, third lens L3, fourth lens L4, and fifth lens L5) is designed with specific optical properties and can be made of different glass materials, allowing independent optimization of each lens to correct various types of aberrations including spherical aberration, coma, and distortion in addition to chromatic aberration
Solution Approach 2:
The patent uses composite optical design by combining multiple lenses made of different ordinary optical glass materials with varying refractive indices and Abbe numbers. This composite approach allows correction of chromatic aberration and other optical defects through the combined effect of multiple materials rather than relying on a single achromatic lens
4Manufacturing precision
If complex structures and precise components are used to achieve high pixel and large aperture imaging, then imaging performance is improved, but manufacturing cost increases
Solution Approach 1:
The patent achieves high-pixel and large-aperture imaging using conventional optical glass lenses that are much cheaper to manufacture than fluorite or other exotic materials. The five-lens configuration can be produced using standard optical manufacturing processes, eliminating the need for expensive precise components while maintaining high imaging performance
Solution Approach 2:
The patent incorporates aspherical surfaces on certain lenses (particularly the fifth lens L5 which has at least one aspherical surface) to correct optical aberrations more effectively. This use of aspherical curvature allows achieving high imaging quality with conventional materials and simpler manufacturing processes compared to using multiple precise spherical lenses
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 design achieves low-cost, miniaturized, high-pixel, and low-distortion imaging with a large aperture, suitable for both day and night use in varying lighting conditions, while being environmentally friendly and stable within the temperature range of -40°C to 85°C.
Implementation Method 1
light emitted from an object point is refracted by the optical lens of the refractive imaging system to form an image of the object point
Data Source
AI summary
An optical lens includes a first lens having negative power, a second lens having positive power, a third lens, a fourth lens, and a fifth lens having positive power. The third lens and the fourth lens form an achromatic lens group. The fifth lens has two surfaces and at least one of the two surfaces is an aspherical surface.