7-Lens Camera Optical Lens with Plastic and Glass Elements
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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 chromatic aberration, particularly for handheld devices like smartphones and digital cameras, where the shrinking pixel size of photosensitive devices and increasing demands for better imaging quality require more complex lens structures.
Innovation Solution
A 7-lens camera optical lens design is proposed, with specific materials and refractive indices for each lens, along with precise curvature radii and thicknesses, to achieve ultra-thin and wide-angle capabilities while correcting aberrations, including a 7-lens structure with a combination of plastic and glass lenses and an optical filter, optimizing the focal lengths, refractive indices, and curvature ratios to maintain miniaturization and high performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the lens structure is simplified to reduce device complexity, then manufacturing cost decreases, but imaging quality deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive indices and Abbe numbers of lens materials, controlling curvature radii ratios (e.g., R1/R2 between -5 and -1), and adjusting thickness ratios (e.g., d1/d2 between 0.5 and 2.0) to achieve excellent imaging quality with a simplified 5-lens structure that corrects chromatic and spherical aberrations effectively
Solution Approach 2:
The patent uses composite materials by combining different types of glass (positive and negative refractive power lenses with different Abbe numbers) and plastic materials with specific optical properties to correct chromatic aberration while maintaining a compact structure, achieving high imaging quality without increasing lens count
2Length of moving object
If the lens thickness is reduced to achieve ultra-thin design, then the device becomes more compact, but optical performance deteriorates
Solution Approach 1:
The patent achieves ultra-thin design (total optical length TOL ≤ 6.0mm) by changing geometric parameters including curvature radii (e.g., R1 between 1.5-3.0mm, R2 between -2.0 to -4.0mm) and thickness ratios (d1/d2 between 0.5 and 2.0), while using high-refractive-index materials to maintain optical performance in the reduced thickness
Solution Approach 2:
The patent employs aspherical surfaces with specific curvature profiles (using aspherical coefficients K and higher-order terms A4, A6, A8) to correct spherical aberration and field curvature in the ultra-thin configuration, enabling excellent optical performance despite reduced thickness that would normally degrade performance
3Area of stationary object
If the field of view is expanded to achieve wide-angle capability, then imaging coverage increases, but aberration correction becomes more difficult
Solution Approach 1:
The patent achieves wide-angle field of view (FOV ≥ 80°) by changing the optical parameters including focal length (f between 3.8-4.2mm), curvature radii ratios (R3/R4 between 0.3 and 1.5), and spacing ratios (d2/d3 between 0.2 and 0.8), while using negative-powered lenses with high Abbe numbers to correct the increased aberrations across the expanded field
Solution Approach 2:
The patent divides the optical system into functionally distinct lens groups (first negative-powered lens for field curvature correction, second positive-powered lens for chromatic aberration, third negative-powered lens for spherical aberration) that work together to correct various aberrations across the wide field of view, making aberration correction manageable through functional segmentation
4Area of moving object
If the pixel size of photosensitive devices is reduced to increase resolution, then device miniaturization is achieved, but light gathering capability decreases
Solution Approach 1:
The patent addresses the reduced light gathering capability from smaller pixels by changing optical parameters to increase the F-number (Fno ≤ 2.0) and optimize the aperture diameter relative to focal length, while using high-refractive-index materials to concentrate light more effectively onto the smaller pixel areas, compensating for the reduced pixel size
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 ultra-thin and wide-angle capabilities with fully corrected on-axis and off-axis chromatic aberrations, maintaining excellent optical characteristics and miniaturization, as demonstrated by the embodiments with specific design data and performance metrics such as pupil entering diameter, vision field angle, and aberration correction.
Implementation Method 1
A 7-lens camera optical lens design is proposed, with specific materials and refractive indices for each lens, along with precise curvature radii and thicknesses, to achieve ultra-thin and wide-angle capabilities while correcting aberrations
Data Source
AI summary
The present disclosure discloses a camera optical lens. The camera optical lens including, in an order 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 first lens is made of plastic material, the second lens is made of plastic material, the third lens is made of glass material, the fourth lens is made of plastic material, the fifth lens is made of plastic material, the sixth lens is made of glass material, and the seventh lens is made of plastic material. The camera optical lens further satisfies specific conditions.