7-Element Camera Lens for Ultra-Thin Wide-Angle Imaging
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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 demand for high imaging quality require advanced lens designs.
Innovation Solution
A 7-piece camera optical lens structure is designed, comprising lenses made of different materials (plastic and glass) with specific focal lengths, refractive powers, and curvature radii, optimized to achieve ultra-thin and wide-angle capabilities while correcting aberrations, with conditions such as 1≤f1/f≤1.5 and 1.7≤n3≤2.2 ensuring effective refractive power and shape control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality and chromatic aberration correction are insufficient
Solution Approach 1:
The lens system is divided into 7 distinct lens elements (L1-L7) with different materials and optical properties. Each lens element is independently designed with specific refractive indices, Abbe numbers, and curvature radii to correct various aberrations. This segmentation allows for precise control of optical characteristics while maintaining manageable manufacturing complexity through modular design.
Solution Approach 2:
The patent employs composite material construction with multiple lens elements made from different materials (plastic and glass with varying refractive indices and Abbe numbers). This composite approach enables effective correction of chromatic and spherical aberrations by combining materials with complementary optical properties, achieving superior imaging quality that cannot be obtained with homogeneous materials.
2Length of moving object
If the lens is designed to be ultra-thin, then the device size is reduced, but the optical performance and aberration correction may deteriorate
Solution Approach 1:
The patent utilizes parameter optimization by precisely controlling the refractive indices (n1-n7), Abbe numbers (v1-v7), and curvature radii (R1-R20) of each lens element. By adjusting these parameters within specific ranges, the design achieves ultra-thin total optical length while maintaining excellent optical performance and aberration correction through mathematical optimization of the lens configuration.
Solution Approach 2:
The lens elements incorporate aspherical surfaces with specific curvature radii (R1-R20) to correct spherical aberration and other optical defects. The aspherical design allows for compact lens geometry with optimized light path control, enabling ultra-thin form factor while maintaining high imaging quality and proper focal length characteristics.
3Adaptability or versatility
If a wide-angle design is implemented, then the field of view is increased, but the chromatic aberration and distortion increase
Solution Approach 1:
The 7-element lens structure segments the optical system to distribute aberration correction across multiple elements. Each lens element (L1-L7) is positioned and designed to specifically address different types of aberrations, with the wider the field of view, the more critical this segmentation becomes for maintaining image quality across the entire field.
Solution Approach 2:
The use of composite materials with different dispersion properties (varying Abbe numbers v1-v7) enables effective correction of chromatic aberration across the wide field of view. By combining materials with complementary dispersion characteristics, the patent achieves color correction throughout the expanded field of view that would be impossible with single-material designs.
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 results in a high-performance camera optical lens with a short total optical length, maintaining miniaturization characteristics and achieving excellent imaging quality by fully correcting on-axis and off-axis chromatic aberrations, suitable for ultra-thin and wide-angle applications.
Implementation Method 1
A 7-piece camera optical lens structure is designed, comprising lenses made of different materials (plastic and glass) with specific focal lengths, refractive powers, and curvature radii
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 camera optical lens further satisfies specific conditions.