Six-Element Optical Lens Assembly with Inflection Points
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, compactness, and a desirable field of view, making it difficult to meet the increasing functionality requirements of electronic devices with advanced image capturing capabilities.
Innovation Solution
An optical image lens assembly comprising six lens elements with specific refractive powers, surface curvatures, and inflection points, optimized by conditions such as Abbe numbers and focal lengths, which includes non-cemented lens elements with air gaps to enhance flexibility and reduce size, while ensuring proper aperture size and field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional optical systems are used, then manufacturing and assembly are simpler, but image quality and field of view performance are insufficient
Solution Approach 1:
The optical system is divided into six separate lens elements instead of using conventional cemented doublets or triplets. Each lens element is independently designed with specific refractive powers and surface curvatures, allowing for optimized correction of optical aberrations while maintaining manufacturing feasibility through modular assembly with air gaps between elements.
Solution Approach 2:
Each lens element is designed with non-uniform surface curvatures including inflection points at specific locations. The object-side and image-side surfaces of each element have different curvature characteristics tailored to correct specific aberrations in different regions of the optical field, achieving high image quality through localized optical properties.
2Manufacturing precision
If more lens elements are added to improve image quality, then optical performance increases, but assembly precision requirements increase
Solution Approach 1:
Air gaps are introduced as intermediary spaces between the six lens elements. These air gaps serve as tolerance buffers that reduce the cumulative effect of manufacturing and assembly errors, allowing each lens element to be manufactured and assembled with relaxed precision requirements while still achieving the desired optical performance.
Solution Approach 2:
The six lens elements are designed to collectively perform multiple optical functions: the first element provides initial light convergence, intermediate elements correct various aberrations (spherical, coma, astigmatism), and the sixth element with its specific convex-concave surface configuration provides final focus adjustment and field curvature correction. This distributed functional architecture reduces the precision burden on any single element.
3Ease of manufacture
If lens elements are cemented together, then assembly is simpler, but heat dissipation and sensitivity increase
Solution Approach 1:
The cement layer is extracted and removed from the optical system, replacing it with air gaps between lens elements. This eliminates the cement material that would otherwise act as a heat insulator and sensitivity mediator, allowing for improved heat dissipation from the image sensor and reduced thermal sensitivity of the optical system.
4Manufacturing precision
If aperture size is increased to improve light gathering, then image quality improves, but device size increases
Solution Approach 1:
The lens elements utilize optimized spherical and aspherical surface curvatures, including inflection points on the object-side and image-side surfaces. These curvature designs enable efficient light gathering and focusing with compact element dimensions, achieving high image quality and adequate aperture performance without proportionally increasing the overall device volume.
Solution Approach 2:
The optical system employs specific parameter relationships including the ratio of the sixth element's surface curvatures (R11-R12)/(R11+R12) constrained to 0.05-0.50, and the Abbe number ratio V5/V6 constrained to 0.10-0.30. These parameter optimizations enable compact design while maintaining image quality and aperture performance through efficient optical path management.
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 the achievement of high image quality, compactness, and varied field of view, supporting advanced image capturing capabilities in electronic devices with improved assembly yield and reduced sensitivity, thereby addressing the limitations of conventional optical systems.
Implementation Method 1
The first lens element has positive refractive power. The object-side surface of the sixth lens element is convex in a paraxial region thereof, and the image-side surface of the sixth lens element is concave in a paraxial region thereof.
Data Source
AI summary
An optical image lens assembly includes six lens elements which are, in order from an object side to an image side along an optical path: 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. The first lens element has positive refractive power. The sixth lens element has an object-side surface being convex in a paraxial region thereof and an image-side surface being concave in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one lens element of the optical image lens assembly has at least one inflection point. A thickness along an optical axis of the first lens element is a maximum value among thicknesses along the optical axis of all lens elements of the optical image lens assembly.