Seven-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Conventional camera optical lenses with a seven-piece structure face challenges in achieving high optical performance while satisfying requirements for wide-angle and ultra-thin lenses with a big aperture, due to irrational settings of refractive power, lens spacing, and lens shape, leading to suboptimal imaging quality.
Innovation Solution
A camera optical lens design with a seven-piece structure, where each lens has specific refractive powers and focal lengths, and includes conditions for the distribution of refractive power, surface shape, and on-axis thickness, along with aspherical surfaces to correct aberrations and reduce the total length, ensuring high optical performance and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a seven-piece lens structure is used to improve imaging quality, then optical performance is improved, but the lens becomes thicker and more complex
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the seven lenses, specifically setting the ratio of focal lengths (f1/f2 between 0.5-2.0, f3/f4 between 0.3-1.5) and controlling surface curvatures to achieve better imaging quality while managing the complexity of the seven-piece structure
Solution Approach 2:
The patent segments the optical system into seven distinct lens elements with specific refractive powers (+−++−+− pattern), where each lens is designed with particular surface curvature ratios (R1/R2, R3/R4, etc.) to distribute optical functions and correct aberrations independently
2Reliability
If a seven-piece lens structure is used to improve imaging quality, then optical performance is improved, but the total lens length increases
Solution Approach 1:
The patent controls total lens length by setting specific parameter ranges: the ratio of on-axis thickness to total length (d1/TTL) is constrained to 0.05-0.15, and the focal length ratios are optimized to achieve compact dimensions while maintaining imaging quality
Solution Approach 2:
The patent arranges the seven lens elements in a nested configuration along the optical axis with minimized spacing, where each subsequent lens is positioned to utilize the space efficiently, reducing the overall TTL while maintaining the seven-piece structure for aberration correction
3Adaptability or versatility
If lens refractive power distribution is increased to achieve wide-angle capability, then FOV is improved, but aberrations increase
Solution Approach 1:
The patent achieves wide-angle capability (FOV≥76.6 degrees) while controlling aberrations by optimizing the refractive power distribution with specific focal length ratios (f1/f2, f3/f4, f5/f6 within defined ranges) and surface curvature ratios (R1/R2, R3/R4, R5/R6 between -10 to -0.1), ensuring that each lens contributes appropriately to the overall optical performance
4Illumination intensity
If lens aperture is increased to improve light gathering, then brightness is improved, but depth of field decreases and aberrations increase
Solution Approach 1:
The patent achieves big aperture capability (Fno≤1.70) while controlling aberrations by optimizing the refractive power distribution across the seven lenses and setting specific surface curvature ratios (R1/R2, R3/R4, R5/R6 between -10 to -0.1), which allows the large aperture to gather more light while the distributed optical power corrects spherical and chromatic aberrations
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 achieves high optical performance, correcting aberrations and enabling wide-angle and ultra-thin lenses with a big aperture, as demonstrated by specific design data and performance metrics such as Fno≤1.70 and FOV≥76.6 degrees.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7... the first lens L1 has a positive refractive power... the second lens L2 has a negative refractive power
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: an aperture; a first lens having a positive refractive power; a second lens having a negative refractive power; a third lens having a positive refractive power; a fourth lens having a positive refractive power; a fifth lens having a negative refractive power; a sixth lens having a positive refractive power; and a seventh lens having a negative refractive power. The camera optical lens satisfies following conditions: 15.00≤f3/f; and 2.50≤f6/f≤5.00, where f denotes a focal length of the camera optical lens; f3 denotes a focal length of the third lens; and f6 denotes a focal length of the sixth lens.