Seven-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
There is a need for ultra-thin wide-angle camera lenses with good optical characteristics and fully corrected aberration, particularly for handheld devices and imaging systems, as existing lenses struggle to achieve high imaging quality with smaller pixel sizes and increasing demands for thinner and more compact designs.
Innovation Solution
A seven-piece camera optical lens design is proposed, comprising specific materials and refractive power distributions for its lenses, including plastic and glass elements, with carefully defined focal lengths, refractive indices, and curvature radii to minimize total optical length and correct aberrations, ensuring high performance and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-piece or four-piece lens structure is used, then the device complexity is low, but the imaging quality deteriorates with smaller pixel sizes
Solution Approach 1:
The patent divides the optical system into seven separate lens elements with specific refractive powers (++-+--+ or ++-+++− or ++−−+−−), allowing each element to contribute to correcting different types of aberrations. This segmentation enables high imaging quality with small pixel sizes while maintaining a manageable overall structure.
Solution Approach 2:
The patent specifies different material types for different lens elements (plastic or glass with specific refractive indices and Abbe numbers), creating a composite optical system. This allows optimization of each element's material properties to achieve superior imaging quality that cannot be obtained with uniform materials.
2Manufacturing precision
If more lens elements are added to improve imaging quality, then the imaging quality improves, but the total optical length increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including focal length ratios (0.25≤f1/f≤0.45, −1.50≤f3/f4≤1.50), refractive indices (1.50≤n1≤1.70, 1.60≤n3≤1.80), and curvature radii relationships. These parameter optimizations enable compact element spacing and reduced overall length while maintaining seven elements for high imaging quality.
Solution Approach 2:
Each lens element is designed with specific local optical properties (refractive power, curvature radii ratios, thickness ratios) tailored to its position in the sequence. This localized optimization allows each element to contribute maximally to aberration correction while minimizing its contribution to overall length.
3Adaptability or versatility
If the lens is designed for wide-angle application, then the field of view increases, but the optical characteristics and aberration correction deteriorate
Solution Approach 1:
The seven-element structure with alternating refractive powers is specifically configured to handle wide-angle light rays. Each element's position and power are optimized to correct off-axis aberrations that become prominent in wide-angle applications, enabling both wide field of view and excellent optical characteristics.
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 excellent optical characteristics, including full correction of on-axis and off-axis aberrations, maintaining miniaturization characteristics with a short total optical length, thereby enhancing imaging quality and meeting the demands for wide-angle and ultra-thin lens requirements.
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 arranged from an object side to an image side along an optical axis of the camera optical lens
Data Source
AI summary
The present disclosure relates to the technical field of optical lens and discloses 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 and a seventh lens. The camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50, 1.70≤n4≤2.20, −2.00≤f3/f4≤2.00, −10.00≤(R13+R14)/(R13−R14)≤10.00 and 1.70≤n7≤2.20, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; f4 denotes a focal length of the fourth lens; n4 denotes a refractive index of the fourth lens; n7 denotes a refractive index of the seventh lens; R13 denotes a curvature radius of an object-side surface of the seventh lens; and R14 denotes a curvature radius of an image-side surface of the seventh lens.