Six-Element Optical Lens Assembly for Compact Imaging
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Solution Overview
Problem
Conventional optical lens assemblies face challenges in balancing image quality, sensitivity, aperture size, volume, and field of view, making it difficult to meet the diverse requirements of modern electronic devices with advanced image sensors.
Innovation Solution
A photographing optical lens assembly comprising six lens elements, each with specific refractive powers and surface shapes, including inflection points, that satisfy specific conditions for focal length, Abbe numbers, and axial distances to achieve a balance between image quality, size, and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but the volume and complexity of the optical lens assembly increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices, Abbe numbers, and curvature radii of each lens element. Specifically, the fifth lens element has a positive refractive power with an Abbe number V5 satisfying 20.0 < V5 < 60.0, and its object-side and image-side surfaces have specific curvature radii R9 and R10 that satisfy -10.0 < R10/f < -1.0 and -20.0 < R10/R9 < -0.5. These parameter optimizations enable high image quality with only six lens elements, reducing overall assembly volume.
Solution Approach 2:
The optical lens assembly is segmented into six lens elements with specific functional divisions. The first lens element has positive refractive power, the second has negative refractive power, the third has positive refractive power, the fourth has negative refractive power, the fifth has positive refractive power, and the sixth has positive refractive power. This segmentation allows each element to contribute specifically to aberration correction and focusing, achieving high image quality without excessive total element count.
2Use of energy by moving object
If the aperture size is increased to improve sensitivity, then sensitivity is improved, but the volume and difficulty of manufacture increase
Solution Approach 1:
The patent optimizes the aperture design by controlling the entrance pupil diameter EPD relative to the focal length f, satisfying 0.30 < EPD/f < 0.70. The fifth lens element's specific curvature radii (R9 and R10) and the axial distances between lens elements (T34, T45, T56) are precisely parameterized to enable large aperture design with f-number satisfying 1.5 < Fno < 3.0, improving sensitivity while maintaining manufacturability through controlled parameters.
3Area of stationary object
If the focal length is increased to improve field of view, then field of view is improved, but the axial distance and volume increase
Solution Approach 1:
The patent employs dynamic optical design where the axial distances between lens elements (T12, T23, T34, T45, T56) are optimized to satisfy specific ratios relative to the total axial distance TL and focal length f. The conditions 0.05 < T45+T56/T34 < 0.50 and 0.30 < TL/f < 1.20 enable the system to achieve a balanced field of view (half maximum field of view satisfying 10.0° < HFOV < 45.0°) with controlled axial distance, effectively managing the trade-off between field of view and compactness.
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 compact optical lens assembly that enhances image quality, sensitivity, and field of view while maintaining a balanced size, effectively addressing the limitations of conventional designs.
Implementation Method 1
Each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has positive refractive power. The fourth lens element has negative refractive power. The fifth lens element has positive refractive power
Data Source
AI summary
A photographing optical lens assembly includes six lens elements, which are, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. Each of the six lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has positive refractive power. The image-side surface of the fourth lens element is concave in a paraxial region thereof. The fifth lens element has positive refractive power, the object-side surface of the fifth lens element is convex in a paraxial region thereof, and the image-side surface of the fifth lens element is convex in a paraxial region thereof.