Aspheric Eight-Lens Imaging Optics for Wide-Angle Miniaturization
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and wide field of view requirements due to the scaling down of pixel size in image sensors and increasing functionality demands.
Innovation Solution
An imaging optical lens system comprising eight lens elements with specific refractive powers and surface shapes, including concave and convex surfaces with critical points in off-axis regions, and optimized focal length ratios to enhance field of view and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pixel size in image sensors is scaled down to improve resolution, then image quality is improved, but the optical system becomes more sensitive and requires smaller aperture sizes which reduces light gathering capability
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratios between lens elements (|f1/f2|≥0.60, |f3/f4|≥0.50, |f5/f6|≥0.60) and optimizing curvature radii relationships (R7/R8≥0.60, R15/R16≤0.60). These parameter optimizations allow the system to maintain high image quality with scaled-down pixels while managing sensitivity through balanced refractive power distribution across eight lens elements.
2Volume of moving object
If the optical system is miniaturized to reduce device size, then portability is improved, but the field of view and image quality become difficult to maintain
Solution Approach 1:
The patent segments the optical system into eight distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to contribute differently to the overall optical performance, enabling miniaturization while maintaining a wide field of view of 70 degrees or more through balanced refractive power distribution.
Solution Approach 2:
The patent employs asymmetric surface designs where at least one lens element has an aspheric surface with a critical point in the off-axis region. This dimensional change from symmetric to asymmetric surfaces enables compact sizing while expanding the effective field of view by utilizing off-axis optical paths.
3Ease of manufacture
If conventional optical systems are used, then manufacturing is simpler, but it is difficult to obtain a balance among high image quality, low sensitivity, proper aperture size, miniaturization and desirable field of view
Solution Approach 1:
The patent establishes specific parameter ranges that balance manufacturing feasibility with performance requirements: focal length ratios (|f1/f2|≥0.60, |f3/f4|≥0.50, |f5/f6|≥0.60), curvature radius ratios (R7/R8≥0.60, R15/R16≤0.60), and a comprehensive formula combining multiple parameters: 0.30≤(R7/R8)+(R15/R16)+(|f1/f2|+|f3/f4|+|f5/f6|)/3≤0.70. These parameter specifications enable manufacturers to achieve high image quality and wide field of view (70° or more) while maintaining reasonable manufacturing complexity.
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 system achieves a wide field of view, reduced size, and improved image quality by balancing refractive power distribution and correcting aberrations, while allowing for flexible design and material choices like glass or plastic.
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. The fourth lens element has negative refractive power. The fifth lens element has positive refractive power.
Data Source
AI summary
An imaging optical lens system includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element and an eighth lens element, in order from an object side to an image side along an optical path. The first lens element has an object-side surface being concave in a paraxial region thereof. The fourth lens element has negative refractive power. The fifth lens element has positive refractive power. At least one lens surface of at least one lens element of the imaging optical lens system has at least one critical point in an off-axis region thereof.