Nine-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Conventional camera lenses for mobile devices face challenges in achieving optimal performance for large aperture, ultra-thinness, and wide angle while maintaining good imaging quality, especially with the increasing demand for miniature lenses and higher pixel density.
Innovation Solution
A camera optical lens design comprising nine lenses, with specific refractive power configurations and curvature radii, optimized to meet conditions such as 0.70≤f1/f≤1.80 and 2.00≤d15/d16≤10.00, which allows for improved aberration correction and ultra-thinness, enabling large aperture and wide angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of lenses is increased to nine lenses to improve imaging quality, then imaging quality is improved, but device complexity and total optical length increase, making it difficult to achieve ultra-thinness and large aperture
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive power distribution across the nine lenses, the thickness ratios (d15/d16 between 2.00-10.00), curvature radii ratios, and spacing relationships. These parameter optimizations enable the nine-lens system to achieve compact dimensions (TTL less than 5 times the focal length) while maintaining excellent imaging quality, resolving the contradiction between complexity and performance
2Measurement precision
If the pixel size of photosensitive devices is reduced to increase pixel density, then more lenses are needed to maintain image quality, but this further increases optical path requirements and conflicts with ultra-thinness requirements
Solution Approach 1:
The patent applies local quality by assigning different refractive power characteristics to different lenses in the sequence. Specifically, the first lens has positive refractive power, the second lens has negative refractive power, and subsequent lenses have varying powers. This localized optimization of optical properties at different positions in the optical path enables effective aberration correction for high-pixel-density sensors while keeping the total optical length compact
Solution Approach 2:
The patent implements a nested structure where multiple lens elements are tightly integrated in sequence with minimal spacing. The nine lenses are arranged in a compact configuration where each lens is positioned immediately after the previous one, creating a nested optical path that minimizes total length while accommodating the complex requirements of high-pixel-density imaging
3Adaptability or versatility
If lens spacing and shape are optimized to achieve large aperture and wide angle, then aperture and angle are improved, but imaging quality deteriorates due to increased aberrations
Solution Approach 1:
The patent applies segmentation by dividing the optical correction function across nine distinct lens elements rather than relying on a single or few lenses. Each lens segment handles specific portions of the optical path and aberration correction, allowing the system to achieve large aperture (F number ≤ 2.01) and wide field of view (greater than 71.50 degrees) while maintaining imaging quality through distributed correction of 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 lens design achieves excellent optical performance, supporting high-pixel CCD and CMOS imaging elements, with a field of view greater than 71.50° and F number less than or equal to 2.01, effectively addressing the limitations of conventional lenses.
Implementation Method 1
a first lens; a second lens having negative refractive power; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens
Data Source
AI summary
A camera optical lens is provided, including from an object side to an image side: a first lens; a second lens having negative refractive power; a third lens; a fourth lens; a fifth lens; a sixth lens; a seventh lens; an eighth lens; and a ninth lens, wherein the camera optical lens satisfies following conditions: 0.70≤f1/f≤1.80; and 2.00≤d15/d16≤10.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; d15 denotes an on-axis thickness of the eighth lens; and d16 denotes an on-axis distance from an image side surface of the eighth lens to an object side surface of the ninth lens. The above camera optical lens can meet design requirements for large aperture, wide angle and ultra-thinness, while maintaining good imaging quality.