Eight-Lens Imaging Assembly for Wide-Angle Aberration Control
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance among high image quality, low sensitivity, proper aperture size, miniaturization, and wide field of view due to the rapid advancements in semiconductor technology and increasing functionality requirements.
Innovation Solution
An imaging system lens assembly comprising eight lens elements with specific refractive powers and surface shapes, including inflection and critical points, to optimize field of view, size, and aberration correction, using glass or plastic materials with optional additives for light absorption and aspheric surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality and correct aberrations, then image quality and aberration correction are improved, but device complexity and size increase
Solution Approach 1:
The lens assembly is divided into eight distinct lens elements with specific refractive power configurations (−++++−−+ or −+++++−+ or −−+++−−+), where each element serves specific optical functions. This segmentation allows independent optimization of each element's shape and material properties to correct various aberrations while maintaining overall system performance.
Solution Approach 2:
Different lens elements are assigned different refractive powers and surface curvatures tailored to their specific positions in the optical path. For example, the first lens element has negative refractive power with specific curvature relationships (0.30 < R1/f1 < 0.90), while the eighth lens element has positive refractive power with specific curvature relationships (0.40 < (R15+R16)/f8 < 2.50). This local optimization enables precise control of light rays at different stages of the optical path.
2Adaptability or versatility
If the field of view is enlarged to improve functionality, then functionality and adaptability are improved, but optical aberrations and image quality deteriorate
Solution Approach 1:
The lens elements employ aspheric surfaces with inflection points to control light ray paths across wide field angles. The aspheric profiles enable precise correction of off-axis aberrations such as distortion and astigmatism, allowing the system to achieve 90-degree half-field-of-view while maintaining image quality across the entire field.
Solution Approach 2:
The lens design utilizes specific parameter relationships to balance wide field of view with image quality. Key parameters include the focal length ratios (0.40 < f4/f < 1.00, 0.80 < f5/f < 1.80), curvature radius ratios (0.30 < R1/f1 < 0.90, 0.40 < (R15+R16)/f8 < 2.50), and the positioning of inflection points on lens surfaces. These parameter optimizations enable the system to achieve 90-degree half-field-of-view while correcting optical aberrations.
3Volume of moving object
If the lens assembly is miniaturized to reduce device size, then device size is reduced, but aperture size and light gathering capability are limited
Solution Approach 1:
The eight lens elements are arranged in a compact nested configuration along the optical axis, with each element positioned to optimize space utilization. The alternating refractive power configuration (−++++−−+ or −+++++−+ or −−+++−−+) allows for efficient packing while maintaining proper optical spacing, achieving miniaturization without sacrificing aperture capability.
Solution Approach 2:
The design optimizes the axial distribution of lens elements and their thicknesses to achieve compact form factor. By carefully controlling the axial distances between elements and the central thicknesses of each element, the system achieves miniaturization in the axial dimension while maintaining adequate aperture size in the radial dimension.
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 enables a wide field of view up to 90 degrees while maintaining compact size and high image quality, reducing sensitivity and aberrations, and accommodating various environmental conditions.
Implementation Method 1
Each of the eight lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side, with specific refractive powers (−++++−−+, −+++++−+ or −−+++−−+) that refract light to achieve wide field of view and correct aberrations
Data Source
AI summary
An imaging system lens assembly includes eight lens elements which are, in order from an object side to an image side along an optical path, a first lens element through an eighth lens element. The first lens element has negative refractive power. The object-side surface of the first lens element is concave in a paraxial region thereof and has at least one inflection point in an off-axis region thereof. The eighth lens element has positive refractive power. The object-side surface of the eighth lens element is convex in a paraxial region thereof. The image-side surface of the eighth lens element is concave in a paraxial region thereof and has at least one inflection point in an off-axis region thereof. At least one of the lens surface of at least one of the second through seventh lens elements has at least one inflection point in an off-axis region thereof.