Six-Lens Imaging Lens for Wide-Angle Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging lenses for in-vehicle and surveillance cameras face challenges in achieving a balance of small size, low cost, wide angle of view, and high optical performance, with previous solutions either limiting the angle of view or increasing costs due to the use of cemented lenses and special materials.
Innovation Solution
A six-lens imaging lens system comprising a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens, and a positive sixth lens, with specific surface shapes and materials (glass and plastic) that optimize refractive power distribution and material selection to reduce size and cost while enhancing optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cemented lenses are used to correct chromatic aberrations, then optical performance is improved, but manufacturing cost increases due to special cementing material and processing
Solution Approach 1:
The patent divides the lens system into six separate plastic lens elements instead of using cemented lenses. Each lens element is independently molded, eliminating the need for cementing materials and complex assembly processes while maintaining optical performance through precise surface design
Solution Approach 2:
The patent uses inexpensive plastic materials for all lens elements instead of expensive glass and cementing materials. Plastic lenses can be mass-produced through injection molding, significantly reducing manufacturing cost while achieving sufficient optical performance for the application
2Adaptability or versatility
If the lens system is designed for wide angle of view, then field coverage is improved, but optical performance deteriorates due to increased aberrations
Solution Approach 1:
The patent applies aspherical surfaces to specific lens elements (first, second, third, and sixth lenses) where they are most needed for correcting wide-angle aberrations. The aspherical surfaces locally modify the refractive power distribution to correct distortion and coma while maintaining spherical surfaces elsewhere for simplicity
Solution Approach 2:
The patent uses a combination of resin materials with different Abbe numbers (vd1 > vd2, vd3 < vd4) to correct chromatic aberrations. This composite material approach allows dispersion compensation without requiring cemented lens structures, achieving wide-angle performance with reduced aberrations
3Volume of moving object
If the lens system is reduced in size, then compactness is improved, but manufacturing precision becomes more difficult to maintain
Solution Approach 1:
The patent uses plastic materials that can be precision-molded in small sizes through injection molding. This manufacturing method inherently maintains precision for small components while keeping costs low, as the molding process can achieve tight tolerances without complex post-processing
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements to correct aberrations that become more pronounced in compact designs. The aspherical profiles are directly formed during injection molding, maintaining precision while enabling the compact form factor needed for modern imaging applications
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 compact, cost-effective imaging lens with a wide angle of view and excellent optical performance, effectively correcting various aberrations and maintaining high image quality even in peripheral areas.
Implementation Method 1
an imaging lens according to a first aspect of the present invention is an imaging lens substantially consisting of six lenses of a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens and a positive sixth lens in this order from an object side
Data Source
AI summary
An imaging lens substantially consists of six lenses of a negative first lens, a negative second lens, a positive third lens, a positive fourth lens, a negative fifth lens and a positive sixth lens in this order from an object side. An object-side surface of the second lens has a shape having negative refractive power at a center, and including a part having positive refractive power in an area between the center and an effective diameter edge, and having negative refractive power at the effective diameter edge (concave shape facing the object side), and the refractive power at the effective diameter edge being weaker than the refractive power at the center. Further, an object-side surface of the third lens is convex toward the object side. Further, a predetermined conditional formula about a combined focal length of the first lens, the second lens and the third lens is satisfied.