Six-Lens Imaging System for Compact Wide-Angle Optical Correction
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Solution Overview
Problem
Current 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 existing solutions either being costly due to specialized cementing materials or limited in their angle of view.
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 refractive power arrangements to minimize size and cost while enhancing optical performance and correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cemented lenses are used to reduce chromatic aberrations and improve sensitivity, then optical performance is improved, but cost increases due to special cementing material and processing requirements
Solution Approach 1:
The lens system divides the optical correction function into separate air-spaced lens elements rather than using cemented combinations. Each lens element is independently positioned and adjusted, allowing standard manufacturing processes to be used while achieving the desired optical performance through strategic placement of positive and negative lenses.
Solution Approach 2:
The patent employs conventional, easily manufacturable lens elements with standard coatings rather than expensive specialized cemented lens combinations. By using air-spaced design with standard glass or plastic materials, the system achieves cost-effective production while maintaining adequate optical performance for the application.
2Volume of moving object
If lens size is reduced to match small imaging devices, then compactness is improved, but achieving wide angle of view becomes more difficult
Solution Approach 1:
The patent achieves wide angle of view in a compact lens by strategically arranging lens elements along the optical axis in a multi-element configuration. The specific sequence of positive and negative lenses creates a telescopic effect that expands the effective field of view without increasing the physical footprint of the lens assembly.
Solution Approach 2:
The system utilizes specific refractive index combinations and curvature radii of the lens elements to optimize the balance between size and angle of view. By carefully selecting the focal lengths and spacing of the six lenses, the patent achieves a wide field of view while maintaining a compact overall length suitable for small imaging devices.
3Device complexity
If the number of lenses is reduced to lower cost and simplify structure, then manufacturing complexity is reduced, but optical performance may deteriorate
Solution Approach 1:
Each lens element in the six-element system is designed to perform multiple functions simultaneously: correcting specific aberrations, controlling focal length, and optimizing the overall field of view. The strategic combination of positive and negative lenses allows a relatively small number of elements to achieve comprehensive optical correction that would otherwise require more 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 proposed lens system achieves a compact size, low cost, and a wide angle of view while maintaining high optical performance, effectively correcting various aberrations and providing excellent image quality even in peripheral areas.
Implementation Method 1
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 is concave, and an object-side surface of the third lens is concave. A predetermined conditional formula about a combined focal length of the fourth lens and the fifth lens is satisfied.