Seven-Element Optical Lens Assembly for Wide Field of View
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Solution Overview
Problem
Conventional optical systems struggle to balance high image quality, low sensitivity, proper aperture size, miniaturization, and desirable field of view due to the scaling down of pixel size in image sensors and increasing functionality requirements.
Innovation Solution
An optical lens assembly comprising seven lens elements with specific refractive powers and surface configurations, including concave and convex surfaces with inflection points, and adherence to specific radius and Abbe number ratios, to optimize image quality and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the pixel size in image sensors is scaled down to improve manufacturing and integration, then device integration and cost are improved, but image quality deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of lens elements. Specifically, it sets the refractive index of the fourth lens element between 1.6 and 2.0, and the Abbe number between 20 and 40, while the seventh lens element has an Abbe number between 20 and 30. These parameter optimizations allow the optical system to maintain high image quality despite smaller pixel sizes by better controlling light refraction and reducing chromatic aberration.
Solution Approach 2:
The patent uses composite material principles by combining lens elements with different refractive indices and Abbe numbers. The optical system integrates seven lens elements made from different materials (with refractive indices ranging from 1.5 to 2.0), creating a composite optical system that compensates for the limitations of small pixel sizes through material diversity and complementary optical properties.
2Volume of moving object
If the optical system is miniaturized to meet compact device requirements, then device size is reduced, but image quality and field of view deteriorate
Solution Approach 1:
The patent applies segmentation by dividing the optical system into seven distinct lens elements instead of using fewer, larger elements. This segmentation allows for better distribution of optical functions across compact distances, with each element contributing to specific aberration corrections. The systematic division enables miniaturization while maintaining image quality through localized optimization of each element's refractive properties.
Solution Approach 2:
The patent optimizes geometric parameters including the curvature radii and axial distances between lens elements. By precisely controlling parameters such as the curvature radius of each surface and the axial distance between elements (with the total track length optimized for compactness), the system achieves miniaturization without sacrificing image quality or field of view.
3Volume of moving object
If the optical system is miniaturized to meet compact device requirements, then device size is reduced, but field of view deteriorates
Solution Approach 1:
The seven-element segmentation enables diverse angular deviations to be corrected across the field. Each lens element is positioned and configured to handle specific portions of the light cone, allowing the compact system to capture and properly focus light from a wide field of view angles that would be impossible with fewer, larger elements.
Solution Approach 2:
The patent optimizes geometric parameters including curvature radii and axial distances to expand the field of view. By carefully adjusting these parameters, the compact optical system achieves an optimized field of view that would be unattainable with conventional miniaturized designs.
4Device complexity
If conventional optical systems are used, then simplicity is maintained, but balance among image quality, aperture size, and field of view cannot be achieved
Solution Approach 1:
The patent systematically optimizes multiple parameters simultaneously: refractive indices (1.6-2.0 for fourth element, 20-40 Abbe number), axial distances, curvature radii, and element spacings. This multi-parameter optimization approach achieves the desired balance among image quality, aperture size, and field of view, demonstrating that increased complexity in parameter control yields superior overall performance.
Solution Approach 2:
The optical system uses a composite structure of seven lens elements with different refractive indices and Abbe numbers. This composite approach enables the system to simultaneously achieve high image quality through aberration correction, proper aperture control, and expanded field of view, balancing multiple performance requirements that cannot be met by simpler, single-material systems.
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 optical lens assembly achieves a wide field of view, reduced spherical and chromatic aberrations, and improved image quality while maintaining a compact size, suitable for various electronic devices.
Implementation Method 1
The seven lens elements are, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side.
Data Source
AI summary
An optical lens assembly includes seven lens elements which are, in order from an object side to an image side along an optical path: a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element. An object-side surface of the first lens element is concave in a paraxial region thereof. The third lens element has positive refractive power. An object-side surface of the sixth lens element is convex in a paraxial region thereof, and an image-side surface of the sixth lens element is concave in a paraxial region thereof. An image-side surface of the seventh lens element is concave in a paraxial region thereof, and the image-side surface of the seventh lens element has at least one inflection point.