Multi-Group Photographing Lens Assembly for Compact Imaging
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Solution Overview
Problem
Conventional optical systems in portable electronic devices struggle to balance high image quality and compact size, particularly in devices with high-end specifications like smartphones and tablets, due to limitations in lens design and manufacturing processes.
Innovation Solution
A photographing optical lens assembly with a specific configuration of lens elements, including air gaps between adjacent lens elements, aspheric surfaces, and controlled refractive powers, to correct aberrations and maintain a compact size while enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but the optical system size increases
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power, and third lens group with positive refractive power). This segmentation allows each group to contribute differently to aberration correction while maintaining a compact overall structure, resolving the contradiction between image quality and system size.
Solution Approach 2:
The patent introduces air gaps between adjacent lens elements in the third lens group, creating spatial separation in a dimension that doesn't increase the overall optical path length. This allows for better aberration control without proportionally increasing the system volume.
2Volume of moving object
If conventional lens structures are used to maintain compact size, then optical system size is reduced, but image quality deteriorates
Solution Approach 1:
Different lens groups are assigned different refractive powers and structural characteristics locally. The first lens group has positive refractive power for convergence, the second has negative refractive power for divergence and aberration correction, and the third has positive refractive power. This local differentiation allows compact design while maintaining high image quality through targeted aberration correction in each region.
Solution Approach 2:
The patent employs aspheric surfaces on multiple lens elements, including the object-side and image-side surfaces of the seventh lens element, and both surfaces of the eighth lens element. These curved surfaces enable better light ray control and aberration correction within a compact form factor, overcoming the limitations of conventional spherical lens designs.
3Volume of moving object
If lens elements are placed closer together to reduce size, then optical system size is reduced, but aberration correction capability deteriorates
Solution Approach 1:
The air gaps between lens elements in the third lens group are designed in advance to provide sufficient space for aberration correction without requiring larger overall dimensions. This preliminary spatial arrangement allows the lens elements to work together more effectively in correcting aberrations while maintaining a compact system.
Solution Approach 2:
The patent optimizes specific parameters including the curvature radius of the image-side surface of the eighth lens element (R16) relative to the focal length (f), satisfying the condition 0 < f/R16 ≤ 0.5. This parameter optimization enables effective aberration correction in a compact configuration by precisely controlling the optical properties of each lens element.
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 lens assembly achieves improved image quality and compactness by effectively correcting aberrations and optimizing refractive power distribution, suitable for various electronic devices with high image resolution requirements.
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.