Photographing Lens Assembly With Air-Gapped Aspheric Lens Groups
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional optical systems in portable electronic devices struggle to balance high image quality with compact size, as they often require complex cemented lens elements that are difficult to manufacture and prone to displacement, leading to image quality issues.
Innovation Solution
A photographing optical lens assembly with non-cemented lens elements in the third lens group, featuring air gaps between adjacent lens elements, and a refractive power distribution across three lens groups to correct aberrations and maintain compactness, using aspheric surfaces and specific curvature conditions to enhance image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional cemented lens elements are used to achieve high image quality, then image quality can be improved, but manufacturing complexity and difficulty increase significantly
Solution Approach 1:
The optical lens assembly is divided into multiple independent lens elements (first through eighth lens elements) that are not cemented together. Each lens element can be manufactured and assembled separately, eliminating the complex cementing process while maintaining optical performance through precise spacing and alignment of individual elements.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements (including the seventh and eighth lens elements) to correct optical aberrations. These curved surfaces are designed with specific curvature radii relationships (such as the condition between f/R16 and f/R17) to achieve high image quality without requiring cemented constructions.
2Manufacturing precision
If cemented lens elements are used to correct aberrations, then image quality improves, but lens elements may displace leading to image quality issues
Solution Approach 1:
By using non-cemented independent lens elements with air gaps between them, the patent eliminates the displacement problems associated with cemented constructions. Each lens element remains stable in its own position, and the air gaps prevent mechanical stress and potential delamination that occur in cemented systems.
Solution Approach 2:
Air gaps serve as intermediaries between adjacent lens elements, providing mechanical separation while maintaining optical continuity. This intermediary space allows each lens element to be positioned and secured independently without relying on adhesive bonds, thereby improving reliability.
3Manufacturing precision
If more lens elements are added to improve image quality, then aberration correction improves, but device size increases
Solution Approach 1:
The patent uses aspheric surfaces on multiple lens elements to achieve superior aberration correction with a compact number of elements. The specific curvature relationships (such as the ratio conditions involving R16 and R17) allow for efficient optical power distribution, reducing the need for additional lens elements and thereby keeping the overall optical system size compact.
Solution Approach 2:
The patent optimizes various parameters including the curvature radii relationships (f/R16, f/R17), air gap dimensions, and refractive indices to achieve high image quality in a compact configuration. By carefully controlling these parameters, the optical system achieves excellent aberration correction without requiring a large physical size.
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 achieves improved image quality and compact size by effectively correcting aberrations and reducing manufacturing complexity, while allowing flexibility in design and material choice for lens elements.
Implementation Method 1
Both an object-side surface and an image-side surface of the seventh lens element are aspheric. Both an object-side surface and the image-side surface of the eighth lens element are aspheric.
Data Source
AI summary
A photographing optical lens assembly includes, in order from an object to an image side, a first lens group, a second lens group and a third lens group. The first lens group includes a first lens element and a second lens element. The second lens group includes a third lens element, a fourth lens element and a fifth lens element. The third lens group includes a sixth lens element, a seventh lens element and an eighth lens element. The first lens element has positive refractive power. The seventh lens element has an object-side surface and an image-side surface being both aspheric. The eighth lens element has an image-side surface being concave in a paraxial region thereof, wherein both an object-side surface and the image-side surface thereof are aspheric, and the image-side surface of the eighth lens element has at least one inflection point.