Seven-Lens Optical Imaging System Aberration Control
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Solution Overview
Problem
The challenge is to design an optical imaging lens that balances lightness, thinness, high imaging quality, and large aperture for portable electronic devices, while meeting the demands of high pixel, high resolution, and miniaturization, while also reducing aberrations and improving performance in diverse application scenarios.
Innovation Solution
The optical imaging lens is composed of seven lenses with specific refractive powers, surface types, and axial distances, including aspherical surfaces, which are strategically arranged to optimize focal lengths, entrance pupil diameters, and field of view, ensuring effective light convergence and improved processing and assembly characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the number of lenses is increased to improve imaging quality and reduce aberrations, then imaging quality is improved, but device complexity and thickness increase
Solution Approach 1:
The optical imaging lens divides the imaging system into seven independent lens elements with specific refractive powers and surface configurations. Each lens element (first lens L1 through seventh lens L7) is designed with specific curvature radii, thicknesses, and spacing to collectively achieve high imaging quality while managing overall system complexity through modular segmentation
Solution Approach 2:
Different lens elements are assigned specific local optical properties: the third lens L3 and fourth lens L4 are designed with convex-concave surface configurations to correct specific aberrations, while the sixth lens L6 is assigned positive refractive power for focal convergence. Each lens element has optimized curvature radii (R1-R14) and thicknesses (CT1-CT7) tailored to its position and function within the overall optical system
2Illumination intensity
If the aperture is increased to improve light gathering capability, then brightness is improved, but aberrations increase
Solution Approach 1:
The patent optimizes multiple parameters simultaneously: the f-number is controlled within 1.8-3.0 to balance aperture size with aberration control, the focal length f is optimized relative to entrance pupil diameter EPD (0.95<f/EPD≤1.30), and the ratio of total track length to focal length (TTL/f) is controlled within 1.20-1.60. These parameter changes enable large aperture operation while maintaining imaging quality through precise control of focal ratio and optical path geometry
Solution Approach 2:
The patent converts the potential harm of large aperture-induced aberrations into benefits by using the increased light gathering capability to improve signal-to-noise ratio in low-light conditions, while the specifically designed seven-lens configuration with varied refractive powers and surface curvatures compensates for and corrects the introduced aberrations, turning the trade-off into a performance advantage
3Length of moving object
If the focal length is decreased to achieve miniaturization, then device thickness is reduced, but field of view and imaging quality are compromised
Solution Approach 1:
The patent achieves miniaturization not by simply reducing focal length in one dimension, but by optimizing the three-dimensional arrangement of seven lens elements along the optical axis. The total track length TTL is controlled within 2.50-4.50mm through precise control of spacing distances (T12, T23, T34, T45, T56, T67) and center thicknesses (CT1-CT7), while the field of view is maintained at 40°-60° through the collective optical power distribution of all lens elements
Solution Approach 2:
Each lens element serves multiple functions: the first lens L1 with negative refractive power provides both initial light convergence and aberration correction, the third lens L3 with convex-convex configuration provides both focusing power and distortion correction, and the seventh lens L7 provides both image plane positioning and final aberration compensation. This multi-functionality allows compact design without sacrificing field of view or imaging quality
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
This configuration results in a lens with a large aperture, wide field of view, and excellent imaging quality, reducing aberrations and enhancing performance in both bright and dark environments, while maintaining a compact form factor.
Implementation Method 1
The optical imaging lens sequentially comprises the following components from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens has a refractive power; the second lens has a refractive power; the third lens has a refractive power
Implementation Method 2
the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy the following relation: f/EPD
Data Source
AI summary
The application discloses an optical imaging lens, and the optical imaging lens sequentially comprises the following components from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, wherein the first lens has a refractive power; the second lens has a refractive power; the third lens has a refractive power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a convex surface; the fourth lens has a refractive power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens is a concave surface; the fifth lens has a refractive power; the sixth lens has a positive refractive power; and the seventh lens has a refractive power, and the object side surface of the seventh lens is a convex surface. Wherein, the total effective focal length f of the optical imaging lens and the entrance pupil diameter EPD of the optical imaging lens satisfy the following relation: f/EPD<1.7; and the total effective focal length f of the optical imaging lens and the maximum semi field of view Semi-FOV of the optical imaging lens meet the following relation: 4 mm<tan(Semi-FOV)×f<5 mm.