Five-Piece Optical Lens System Wide Field of View
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Solution Overview
Problem
Conventional four-piece optical lens systems used in electronic products, such as digital cameras and biomedicine, suffer from limited field of view and low yield rate, which are not adequately addressed by existing technologies.
Innovation Solution
A five-piece optical lens system is designed with specific refractive power relationships and aspheric surface configurations between lens elements, including a first negative refractive power lens with a convex object-side surface, a second negative refractive power lens with a concave image-side surface, a third positive refractive power lens with a convex object-side surface, a fourth positive refractive power lens with a convex image-side surface, and a fifth negative refractive power lens with a concave object-side surface, optimizing focal length ratios to achieve a wide field of view and high yield rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conventional four-piece optical lens system is used, then the device complexity is reduced, but the field of view becomes small and the yield rate decreases
Solution Approach 1:
The patent divides the optical lens system into five distinct lens elements with specific refractive power configurations (first negative, second negative, third positive, fourth positive, fifth negative). This segmentation allows each element to contribute differently to the overall optical performance, enabling a wider field of view while maintaining manageable complexity through modular design
Solution Approach 2:
The patent introduces aspheric surfaces on at least one surface of each lens element, adding a dimensional aspect to the lens design. This aspheric configuration enables better control over light rays across a wider field of view, effectively expanding the optical performance dimension without proportionally increasing structural complexity
2Device complexity
If a conventional four-piece optical lens system is used, then the device complexity is reduced, but the yield rate becomes low
Solution Approach 1:
The patent specifies precise parameter relationships between lens elements, including focal length ratios (|f1|/|f2|=2.5-5.0, |f2|/|f3|=0.3-0.8, |f3|/|f4|=1.0-2.5, |f4|/|f5|=0.5-1.5) and the overall focal length to total length ratio (|f/TL|=0.1-0.3). These controlled parameter changes optimize manufacturing tolerances and assembly precision, thereby improving yield rate while maintaining a relatively simple five-piece structure
3Adaptability or versatility
If more lens elements are added to increase field of view, then the field of view becomes wide, but the device complexity increases
Solution Approach 1:
Each of the five lens elements is designed with multi-functionality: they collectively provide wide field of view coverage, correct optical aberrations, and maintain compact overall length. The aspheric surfaces on multiple elements serve universal purposes of both expanding field of view and controlling spherical aberration, reducing the need for additional specialized components
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 five-piece optical lens system provides a wide field of view and high yield rate by maintaining optimal refractive power ratios between lens elements, enhancing performance and resolution while maintaining cost-effectiveness through the use of plastic or glass materials.
Implementation Method 1
a first lens element with a negative refractive power having a convex object-side surface; a second lens element with a negative refractive power having a concave image-side surface
Data Source
AI summary
A five-piece optical lens system comprises, in order from the object side to the image side: a first lens element with a negative refractive power having a convex object-side surface; a second lens element with a negative refractive power having a concave image-side surface; a third lens element with a positive refractive power having a convex object-side surface; a stop; a fourth lens element with a positive refractive power having a convex image-side surface; a fifth lens element with a negative refractive power having a concave object-side surface, each of the second, third, fourth and fifth lens elements has at least one aspheric surface. Thereby, such a system has a wide field of view and can improve the yield rate when being applied to biomedicine, car recorder, camera or other electronic products.