Eight-Lens Camera Optical Lens Design for Ultra-Thin Wide-Angle Imaging
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Solution Overview
Problem
Current camera lenses with an eight-piece structure face challenges in achieving high optical performance while meeting requirements for ultra-thin, wide-angle lenses with a big aperture, due to irrational settings in refractive power, lens spacing, and lens shape.
Innovation Solution
A camera optical lens design comprising eight lenses, with specific refractive power and focal length conditions for each lens, including 3.50≤f1/f≤6.50, f2≤0, and 1.55≤n7≤1.70, to balance spherical aberration and field curvature, and achieve ultra-thin, wide-angle lenses with high optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an eight-piece lens structure is used to improve imaging quality, then optical performance is improved, but the lens structure becomes complex and difficult to optimize for ultra-thin, wide-angle designs
Solution Approach 1:
The patent applies parameter changes by establishing specific mathematical relationships between focal lengths (f1/f ratio), refractive powers (f2≤0), and refractive indices (n7 range) of different lens elements. These parameter constraints optimize the eight-piece lens structure to achieve ultra-thin, wide-angle imaging performance while maintaining high optical quality, resolving the contradiction between complex structure and performance optimization.
2Device complexity
If traditional three-piece or four-piece lens structures are used, then the lens structure is simple, but imaging quality is insufficient for high-pixel photosensitive devices
Solution Approach 1:
The patent applies segmentation by dividing the optical system into eight distinct lens elements with specific refractive power distributions (positive-negative-positive-negative patterns). This segmentation allows each lens element to correct specific aberrations, achieving high imaging quality suitable for high-pixel photosensitive devices while managing the complexity through systematic design.
3Ease of manufacture
If lens refractive power and spacing are traditionally configured, then manufacturing is straightforward, but the lens cannot achieve both ultra-thin profile and wide-angle with big aperture
Solution Approach 1:
The patent transforms traditional lens design parameters by enforcing specific constraints: f1/f ratio between 0.35-0.65, f2≤0 (negative focal length for second lens), and n7 between 1.55-1.70 (refractive index of seventh lens). These parameter changes enable the lens to achieve ultra-thin profile, wide-angle field of view, and big aperture simultaneously while remaining manufacturable.
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 design effectively corrects aberrations and achieves high imaging quality, making it suitable for mobile phone and webcam applications with high pixel imaging elements.
Implementation Method 1
n7 denotes a refractive index of the seventh lens, where 1.55≤n7≤1.70
Data Source
AI summary
The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: a first lens; a second lens; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; and an eighth lens. The camera optical lens satisfies following conditions: 3.50≤f1/f≤6.50; f2≤0; and 1.55≤n7≤1.70, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; and n7 denotes a refractive index of the seventh lens. The present disclosure can achieve ultra-thin, wide-angle lenses having a big aperture.