Five-Piece Optical Lens Aberration Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional imaging lenses for mobile devices, consisting of three to four lens elements, face challenges in achieving high image quality and resolution due to sensitivity issues during manufacturing and assembly, leading to peripheral image quality degradation and increased production costs.
Innovation Solution
A five-piece optical imaging lens design comprising specific refractive power configurations and aspheric surfaces for each lens element, optimized focal length ratios, and Abbe number relationships to enhance image quality, reduce distortion, and lower assembly sensitivity, thereby improving yield and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased from three to four to five, then image quality and resolution are improved, but manufacturing sensitivity and assembly difficulty increase
Solution Approach 1:
The optical system is divided into five distinct lens elements with specific refractive power configurations (positive, negative, negative, positive, negative). Each lens element has defined surface curvatures and aspheric coefficients, allowing independent optimization of manufacturing parameters while maintaining overall system performance. This segmentation enables precise control over aberration correction and image quality without requiring the entire system to be re-optimized as a single complex unit.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including focal lengths (f1, f2, f3, f4, f5), focal length ratios (e.g., f1/f2 between -0.5 and -1.5, f4/f5 between -1.0 and -2.0), Abbe numbers (V1, V2, V3, V4, V5), and aspheric surface coefficients (A4, A6, A8, A10). These parameter constraints define optimal manufacturing zones that balance image quality with manufacturing feasibility, reducing sensitivity to assembly variations.
2Manufacturing precision
If assembly tolerance is reduced to improve peripheral image quality, then manufacturing precision is improved, but production cost increases
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements with specifically designed aspheric coefficients (A4, A6, A8, A10 for each surface). These curved non-spherical surfaces are optimized to correct peripheral aberrations (such as astigmatism and field curvature) more effectively than spherical surfaces, allowing for larger assembly tolerances while maintaining high peripheral image quality. This reduces the need for tight tolerance stacking and lowers production costs.
Solution Approach 2:
The optical system uses lens elements with different Abbe numbers (V1, V2, V3, V4, V5) to achieve chromatic aberration correction. By combining materials with different dispersion properties across five lens elements, the system achieves superior color rendering and peripheral sharpness without requiring extremely tight manufacturing tolerances, thereby reducing production costs while maintaining high image quality.
3Manufacturing precision
If the aperture value is increased to improve light gathering, then image quality is improved, but manufacturing sensitivity increases
Solution Approach 1:
The patent optimizes each lens element's local properties including surface curvatures, thicknesses, and aspheric coefficients to handle specific regions of the optical field. The first lens element (positive power) and fourth lens element (positive power) are designed with specific convex/concave surface configurations to control light paths at different aperture zones. This local optimization allows the system to maintain high image quality across the full aperture range without requiring the entire system to be manufactured with excessive precision.
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 imaging lens achieves high image quality, low distortion, and reduced sensitivity to assembly, resulting in improved resolution and field of view while minimizing production costs and maintaining miniaturization objectives.
Implementation Method 1
a first lens element with a positive refractive power having an object-side surface being convex near an optical axis and the image-side surface being concave near the optical axis
Implementation Method 2
at least one of the object-side and image-side surfaces of the first lens element being aspheric
Data Source
AI summary
A five-piece optical imaging lens, in order from an object side to an image side, includes: an aperture stop; a first lens element with a positive refractive power having an object-side surface being convex near an optical axis and the image-side surface being concave near the optical axis; a second lens element with a negative refractive power having an object-side surface being convex near the optical axis and an image-side surface being concave near the optical axis; a third lens element with a negative refractive power having an image-side surface being concave near the optical axis; a fourth lens element with a positive refractive power having an object-side surface being concave near the optical axis and an image-side surface being convex near the optical axis; a fifth lens element with a negative refractive power having an image-side surface being concave near the optical axis.