Seven-Lens Camera Optical Lens Design for Wide-Angle Imaging
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Solution Overview
Problem
Conventional camera optical lenses for handheld devices face challenges in achieving high optical performance while meeting design 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 seven-piece camera optical lens design with specific refractive power distributions and surface shapes for each lens, including aspherical surfaces, optimized refractive indices, and focal length ratios, which corrects aberrations and improves imaging quality by distributing refractive power effectively.
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 structure cannot achieve high optical performance while satisfying design requirements for wide-angle and ultra-thin lenses with big aperture due to irrational settings of refractive power, lens spacing and lens shape
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the seven lenses, setting specific focal length ratios (such as 0.15 < f2/f < 0.35 and -0.50 < f5/f < -0.20), and adjusting lens spacing parameters (such as 0.20 < d2/d1 < 0.50 and 0.30 < d4/d3 < 0.80). These parameter optimizations resolve the contradiction by making the lens structure rational while maintaining high imaging quality, enabling wide-angle and ultra-thin lens designs with big aperture.
2Volume of moving object
If the pixel area of photosensitive devices is reduced to meet thinner and smaller device dimensions, then device miniaturization is achieved, but the requirement for imaging quality improves constantly making the lens design more challenging
Solution Approach 1:
The patent applies segmentation by dividing the optical system into seven distinct lens elements with specific refractive power distributions (positive-negative-positive-positive-negative-positive-negative pattern). This segmentation allows each lens to be optimized for specific functions, enabling the system to achieve high imaging quality in miniaturized form factors by distributing the optical correction tasks across multiple specialized elements rather than requiring a single large lens.
Solution Approach 2:
The patent applies local quality by assigning different refractive powers, focal lengths, and shape characteristics to each of the seven lens elements based on their specific positions and functions in the optical path. Each lens element is locally optimized with specific parameters (such as aspherical coefficients and refractive indices) to address specific optical aberrations, enabling high imaging quality in a compact configuration that accommodates smaller pixel sizes.
3Device complexity
If traditional three-piece, four-piece, five-piece or six-piece lens structures are used, then the lens structure is simpler, but the imaging quality is insufficient for modern requirements with smaller pixel sizes
Solution Approach 1:
The patent applies segmentation by using a seven-piece lens structure that divides the optical system into seven functional elements with alternating refractive powers. This segmentation provides sufficient degrees of freedom to correct multiple types of optical aberrations (spherical, coma, astigmatism, field curvature, distortion) simultaneously, achieving high imaging quality that simpler lens structures cannot provide for modern small-pixel sensors.
Solution Approach 2:
The patent applies the concept of composite materials by combining seven lens elements made of different optical materials with varying refractive indices and Abbe numbers. This composite approach allows for sophisticated correction of chromatic and monochromatic aberrations, enabling the lens to achieve superior imaging quality that cannot be obtained with fewer elements or uniform materials.
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 with a field of view of at least 76.60 degrees and a total optical length to image height ratio of less than 1.57, ensuring excellent imaging quality for wide-angle and ultra-thin lenses with a big aperture.
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, and has an object side surface being a convex surface and an image side surface being a concave surface; the second lens L2 has a negative refractive power, and has an object side surface being a convex surface and an image side surface being a concave surface
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: 1.68≤n2≤2.20; and 15.00≤f3/f, where f denotes a focal length of the camera optical lens; n2 denotes a refractive index of the second lens; and f3 denotes a focal length of the third lens.