Five-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Conventional camera lenses struggle to achieve optimal optical performance for large aperture, wide angle, and ultra-thinness, due to irrationality in optical power distribution and lens spacing.
Innovation Solution
A camera optical lens design comprising five lenses with specific refractive powers and curvature radii, along with precise on-axis distances and thicknesses, is implemented to correct aberrations and meet the requirements of a large aperture, wide angle, and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional five-lens structure is used, then optical performance is improved, but the lens structure cannot meet the design requirements of large aperture, wide angle and ultra-thinness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratios (f1/f, f2/f, f3/f, f4/f, f5/f), distances between lenses (d4/d6, d8/d9), curvature radii ratios (R3/R4), and thickness ratios (d1/TTL, d3/TTL, d5/TTL, d7/TTL, d9/TTL) to optimize the lens system. These parameter optimizations enable the lens to achieve large aperture, wide angle, and ultra-thinness simultaneously while maintaining good optical performance.
Solution Approach 2:
The patent segments the lens system into five distinct lens elements with specific refractive powers (positive, positive, negative, positive, negative) arranged in sequence. Each lens element is designed with specific curvature radii and thicknesses to perform particular optical functions, allowing the system to balance aperture, angle of view, and thickness requirements through distributed optical power.
2Measurement precision
If the pixel size of the photosensitive device decreases, then the imaging quality requirement increases, but the lens structure becomes more complex
Solution Approach 1:
The patent optimizes parameters including the focal length ratios of individual lenses, distances between lens elements, curvature radii, and thicknesses to achieve high imaging quality with a five-lens structure. This parameter optimization allows the lens to correct aberrations effectively while maintaining a manageable structure complexity suitable for mobile devices.
Solution Approach 2:
The patent assigns different refractive powers and optical characteristics to specific lens elements (first lens: positive, second lens: positive, third lens: negative, fourth lens: positive, fifth lens: negative) to locally correct different types of aberrations. This localized optimization of optical properties enables high imaging quality without requiring excessive complexity throughout the entire lens system.
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 wide angle and large aperture, suitable for handheld devices, while ensuring ultra-thinness and effective aberration correction.
Implementation Method 1
a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power
Data Source
AI summary
A camera optical lens includes, from an object side to an image side, a first lens having a positive refractive power; a second lens having a positive refractive power; a third lens; a fourth lens having a positive refractive power; and a fifth lens having a negative refractive power, and satisfies: 2.10≤f1/f≤4.00; 1.00≤d4/d6≤3.00; 0.20≤d8/d9≤0.90, and where f and f1 respectively denote focal lengths of the camera optical lens and the first lens; d4 denotes an on-axis distance between the second lens and the third lens; d6 denotes an on-axis distance between the third lens and the fourth lens; d8 denotes an on-axis distance between the fourth lens and the fifth lens; and d9 denotes an on-axis thickness of the fifth lens, thereby achieving good optical performance while satisfying design requirements for ultra-thinness, a wide angle and a large aperture.