Six-Lens Optical Imaging System for Wide Field of View
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Solution Overview
Problem
Conventional optical imaging lenses face challenges in achieving a wide field of view with minimal distortion aberration and low back focal length variation across varying temperatures, particularly in applications like vehicle imaging systems, where blind spots and dark corners are common due to limited horizontal field of view and temperature-induced focal length changes.
Innovation Solution
The design of an optical imaging lens with specific refractive power arrangements and surface shapes, including convex and concave portions on lens elements made of plastic and glass, optimized to ensure a horizontal field of view greater than 175 degrees without dark corners, while maintaining low back focal length variation through precise control of lens thickness and air gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the field of view is increased to capture wider imaging angles, then the horizontal field of view coverage is improved, but distortion aberration increases
Solution Approach 1:
The optical imaging lens is divided into multiple lens elements (first through sixth lens elements), each with specific refractive powers and surface shapes. This segmentation allows each element to contribute to different aspects of light control, enabling wide field of view while managing distortion aberration through coordinated design of individual elements.
Solution Approach 2:
Different lens elements are assigned different refractive powers (positive and negative) and specific surface shape characteristics (convex/concave portions at different locations). This local differentiation of optical properties enables precise control over light paths across different field angles, achieving wide coverage with minimized distortion.
2Length of moving object
If the lens size is reduced to meet miniaturization demands, then the device thickness is decreased, but back focal length variation under temperature changes increases
Solution Approach 1:
The patent specifies precise parameter ranges for lens element thicknesses, air gaps, and refractive powers that remain stable across temperature variations. By controlling these parameters within defined ranges, the design achieves miniaturization while maintaining back focal length stability despite thermal expansion effects.
Solution Approach 2:
The optical lens system combines multiple lens elements made of different materials with varying thermal expansion coefficients and refractive indices. This composite structure compensates for temperature-induced changes, as the differential responses of various materials counterbalance each other to maintain overall focal length stability.
3Adaptability or versatility
If the lens design is optimized for wide field of view with specific surface shapes, then the viewing angle is improved, but manufacturing complexity increases
Solution Approach 1:
The lens elements incorporate aspheric surfaces with specific curvature profiles (convex and concave portions) rather than simple spherical shapes. These curved surface designs enable wide field of view and distortion control, while the standardized aspheric profiles facilitate modern manufacturing techniques, balancing optical performance with manufacturability.
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 enhances the viewing angle, reduces distortion aberration, and maintains image quality across temperature changes, ensuring no blind spots or dark corners in the image sensor's field of view.
Implementation Method 1
the first lens with refractive power from the object side to the image side is defined as a first lens element, the second lens with refractive power from the object side to the image side is defined as a second lens element
Data Source
AI summary
An optical imaging lens including a first lens element to a sixth lens element arranged in sequence from an object side to an image side along an optical axis is provided. The first lens element to the third lens elements are respectively arranged to be lens elements in a first, a second and a third order from the object side to the image side. The fourth lens element to the sixth lens element are respectively arranged to be lens elements in a first, a second and a third order from an aperture to the image side.