Five-Lens Imaging Optical Assembly for Miniaturization
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Solution Overview
Problem
Conventional imaging optical systems face challenges in achieving a balance among image quality, sensitivity, aperture size, volume, and viewing angle, making it difficult to meet diverse requirements in modern electronic devices.
Innovation Solution
An imaging optical lens assembly comprising five lens elements with specific refractive powers and axial distances, including a first lens element with positive refractive power, a second and third lens element with negative refractive power, and a fourth and fifth lens element with optimized Abbe numbers and curvature radii, along with an air gap between adjacent elements, to achieve balanced optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional imaging optical systems are used, then the structure is simple, but the image quality and sensitivity cannot meet high requirements
Solution Approach 1:
The imaging optical system is divided into five independent lens elements with different refractive powers and material properties. Each lens element is optimized for specific functions: the first lens element (positive power) for light convergence, the second and third lens elements (negative power) for aberration correction, and the fourth and fifth lens elements for fine-tuning optical performance. This segmentation allows complex optical functions to be achieved through coordinated simple elements.
Solution Approach 2:
The patent employs lens elements made from different materials with varying refractive indices and Abbe numbers. Specifically, the fourth lens element has an Abbe number V4 between 15-30 and the fifth lens element has an Abbe number V5 between 20-35, creating a composite optical system that leverages the complementary properties of different materials to correct chromatic aberrations while maintaining high image quality.
2Use of energy by moving object
If aperture size is increased to improve sensitivity, then sensitivity improves, but the volume and complexity of the lens assembly increases
Solution Approach 1:
The patent optimizes multiple parameters simultaneously to achieve high sensitivity in a compact form: the axial distances between lens elements (T12, T23, T34, T45) are precisely controlled, the focal length f is optimized relative to the entrance pupil diameter EPD (satisfying 0.50 < f/EPD < 2.40), and the Abbe numbers of the fourth and fifth lens elements are constrained to specific ranges. These parameter optimizations enable efficient light gathering without increasing overall volume.
3Manufacturing precision
If multiple lens elements are added to improve image quality, then image quality improves, but the manufacturing cost and assembly complexity increases
Solution Approach 1:
Each lens element in the five-element system is designed to perform multiple functions. For example, the second lens element with negative refractive power not only corrects spherical aberrations but also contributes to field curvature correction. The third lens element similarly addresses multiple aberration types. This multi-functionality reduces the need for additional specialized elements, simplifying the overall assembly process while maintaining high image quality.
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 provides improved image quality, sensitivity, and flexibility in design, allowing for a wider range of applications by balancing refractive power and correcting aberrations, while also simplifying the lens assembly process and reducing manufacturing costs.
Implementation Method 1
The five lens elements in order from an object side to an image side along an optical path are a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. Each of the five lens elements has an object-side surface facing the object side and an image-side surface facing the image side. The first lens element has positive refractive power, the second lens element has negative refractive power, and the third lens element has negative refractive power.
Data Source
AI summary
An imaging optical lens assembly includes five lens elements. The five lens elements in order from an object side to an image side along an optical path are a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element. Each of the five lens elements has an object-side surface facing the object side and an image-side surface facing the image side. The first lens element has positive refractive power, the second lens element has negative refractive power and the third lens element has negative refractive power. With specific conditions being satisfied, the imaging optical lens assembly can be miniaturized while providing good image quality.