Six-Lens Aspheric Optical Assembly for Compact Imaging
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Solution Overview
Problem
Conventional compact photographing lens assemblies for mobile electronic devices fail to meet the requirements of high image quality and miniaturization, as they do not effectively correct aberrations and maintain a compact size while being lightweight.
Innovation Solution
A photographing optical lens assembly comprising multiple lens elements with specific refractive powers and aspheric surfaces, including a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with an inflection point, a fourth lens element with positive refractive power, a fifth lens element with concave and convex surfaces, and a sixth lens element with negative refractive power and an inflection point, optimized to satisfy specific conditions for focal length, axial distance, and central thickness to improve image quality and reduce size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-lens assembly is used, then the device structure is simple, but the image quality and resolution are insufficient
Solution Approach 1:
The lens assembly is divided into six separate lens elements with different refractive powers and surface characteristics. Each lens element is designed to perform specific optical functions, with the first lens element having positive refractive power, the second and sixth having negative refractive power, and the third through fifth having varying characteristics. This segmentation allows for sophisticated aberration correction while maintaining a compact overall structure.
Solution Approach 2:
The patent employs composite optical design by combining lens elements with different materials and properties. The lens elements have varying refractive indices and aberration characteristics, with at least one lens element having an inflection point in its surface profile. This composite approach enables the system to correct multiple types of optical aberrations simultaneously, achieving high image quality in a compact form factor.
2Volume of moving object
If the lens assembly is miniaturized, then the device size is reduced, but the aberration correction becomes more difficult
Solution Approach 1:
The patent extensively uses aspheric surfaces in the lens element design. The third, fourth, and fifth lens elements each have aspheric object-side and/or image-side surfaces, and at least one lens element includes an inflection point. These curved and complex surface geometries enable sophisticated optical path control within a compact volume, allowing for effective correction of spherical aberration, coma, and other optical defects without requiring excessive lens size.
Solution Approach 2:
The patent optimizes multiple parameters including the refractive power of each lens element, the axial distances between elements, the central thicknesses of specific elements (particularly elements 2, 3, and 4), and the surface curvatures. By carefully adjusting these parameters, the system achieves compact miniaturization while maintaining excellent aberration correction performance across the visible spectrum.
3Measurement precision
If more lens elements are added to improve image quality, then the resolution increases, but the device becomes heavier and more complex
Solution Approach 1:
Each lens element is designed with specific local optical characteristics tailored to its position and function in the sequence. The first lens element has positive refractive power for initial light convergence, while the second and sixth elements have negative refractive power for aberration correction. The third through fifth elements have aspheric surfaces optimized for specific optical paths. This localized optimization allows six elements to achieve high resolution without requiring a heavier, more complex design.
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 effectively corrects aberrations, improves image quality, and miniaturizes the lens assembly, allowing it to be integrated into lightweight and thin-body electronic devices while maintaining a compact size.
Implementation Method 1
a first lens element with positive refractive power, a second lens element, a third lens element, a fourth lens element, a fifth lens element with positive refractive power and a sixth lens element with negative refractive power
Data Source
AI summary
An photographing optical lens assembly includes, 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 with positive refractive power and a sixth lens element with negative refractive power and a image plane. The third lens element, the fourth lens element, the fifth lens element and the sixth lens element each has an aspheric object-side surface and an aspheric image-side surface. The object-side surface of the first lens element is convex. The sixth lens element further comprises at least one inflection point and is made of plastic. By adjusting the refractive power of the first lens element and the photographing optical lens assembly, and adjusting the total length of the photographing optical lens assembly, the total volume of the lens assembly is reduced, and the image quality is improved.