Seven-Element Optical Lens Assembly for Compact Wide-Angle Imaging
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Solution Overview
Problem
Conventional optical lens assemblies face challenges in achieving a balance among image quality, photosensitivity, aperture size, volume, and field of view, making it difficult to develop a single lens assembly that meets diverse requirements.
Innovation Solution
The optical photographing lens assembly consists of seven lens elements with specific refractive powers and surface configurations, including air gaps between adjacent elements, to optimize image quality and compactness, featuring a first lens with negative power, a sixth lens with positive power, and a seventh lens with inflection points on its surfaces, while maintaining a compact design and wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical lens assembly designs are used, then manufacturing and design are simpler, but image quality, photosensitivity, aperture size, volume, and field of view cannot be balanced
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with specific refractive powers and surface configurations. Each lens element (first through seventh) has designated functions: the first lens element has negative refractive power, the sixth has positive refractive power, and the seventh includes inflection points on its surfaces. This segmentation allows independent optimization of each element to collectively achieve balanced image quality, photosensitivity, aperture size, volume, and field of view.
Solution Approach 2:
Different regions of the lens assembly are assigned different optical properties. Specifically, the first lens element uses negative refractive power for light convergence control, the sixth lens element uses positive refractive power for focal adjustment, and the seventh lens element incorporates inflection points on its object-side and/or image-side surfaces for aberration correction. This localized optimization of optical properties enables the overall system to balance multiple performance parameters simultaneously.
2Manufacturing precision
If lens elements are added to improve image quality and reduce aberrations, then image quality improves, but device volume increases
Solution Approach 1:
The patent specifies precise parameter relationships to control lens assembly volume while maintaining image quality. The conditions |f1/f7| ≤ 0.50, TL/ImgH ≤ 1.80, and (R5+R6)/(R5−R6) ≥ 0.05 establish quantitative constraints on focal length ratios, axial distance, and curvature radii. These parameter optimizations allow the seven-lens design to achieve high image quality without excessive volume increase, as the parameters are tuned to minimize the total track length TL relative to the maximum image height ImgH.
3Volume of stationary object
If a compact lens design is used, then volume is reduced, but field of view and image quality may be compromised
Solution Approach 1:
The lens design utilizes aspheric surfaces with inflection points to achieve wide field of view in a compact form. The seventh lens element specifically incorporates inflection points on its object-side and/or image-side surfaces, which allows for broader light angle acceptance and wider field of view without increasing the overall lens volume. This curvature optimization enables the compact seven-lens assembly to maintain adaptability across different viewing angles.
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
This configuration enhances image quality, reduces aberrations, and achieves a compact, wide-angle lens structure that balances image quality and field of view, suitable for various applications in electronic devices.
Implementation Method 1
The first lens element has negative refractive power
Implementation Method 2
The sixth lens element has positive refractive power
Implementation Method 3
At least one of an object-side surface and an image-side surface of the seventh lens element includes at least one inflection point
Data Source
AI summary
An optical photographing lens assembly includes seven lens elements, which are, 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, a sixth lens element and a seventh lens element. The first lens element has negative refractive power. The sixth lens element has positive refractive power. At least one of an object-side surface and an image-side surface of the seventh lens element includes at least one inflection point.