Five-Lens Camera Optical Lens Aberration Correction
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Solution Overview
Problem
Current camera lenses for handheld devices and imaging systems face challenges in achieving a balance between large aperture, ultra-thinness, and wide angle while maintaining good optical performance, particularly due to unreasonable design parameters in focal power, lens spacing, and shape in five-piece lens structures.
Innovation Solution
A camera optical lens design comprising five lenses with specific refractive powers and curvature radii, optimized by conditions such as 12.50≤f3/f≤20.00, 0.30≤(R3+R4)/(R3−R4)≤1.00, and 0.30≤d5/d6≤0.50, which includes a positive and negative refractive power sequence, and additional constraints for each lens to correct aberrations and ensure ultra-thin and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a five-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens structure cannot simultaneously achieve large aperture, ultra-thinness, and wide angle
Solution Approach 1:
The patent applies parameter changes by optimizing the focal lengths, curvature radii, and thickness ratios of the five lens elements. Specifically, it controls the ratio of the third lens focal length to total focal length (12.50≤f3/f≤20.00), the curvature radius ratio of the second lens (0.30≤(R3+R4)/(R3−R4)≤1.00), and the thickness ratio of the third lens (0.30≤d5/d6≤0.50). These parameter optimizations enable the lens to achieve large aperture (FNO≤1.90), ultra-thinness (TTL/IH≤1.40), and wide angle while maintaining good optical performance.
2Length of moving object
If the pixel size of photosensitive devices is reduced to enable thinner devices, then device thickness is reduced, but imaging quality requirements become more stringent
Solution Approach 1:
The patent divides the optical system into five separate lens elements with different refractive powers (positive, negative, positive, positive, negative). This segmentation allows each element to be optimized for specific functions: the first lens (positive power) captures light at large angles, the second lens (negative power) corrects aberrations, the third lens (positive power) focuses light, the fourth lens (positive power) enhances imaging quality, and the fifth lens (negative power) corrects residual aberrations. This segmented design enables high-quality imaging on small pixel surfaces while maintaining thin overall device thickness.
3Ease of manufacture
If traditional three-piece or four-piece lens structures are used, then manufacturing is simpler, but imaging quality is insufficient for high-pixel photosensitive devices
Solution Approach 1:
The patent employs a five-piece lens structure that segments the optical system into distinct functional elements. Each lens element is designed with specific refractive power and curvature characteristics to address particular optical challenges. The alternating positive and negative refractive powers enable effective aberration correction while maintaining a manageable manufacturing process for each individual element, thus achieving high imaging quality without excessive manufacturing complexity.
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 a large aperture, wide angle, and ultra-thinness with improved optical performance, suitable for high-pixel imaging devices like smartphones and webcams, effectively correcting aberrations and ensuring high-quality imaging.
Implementation Method 1
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; and a fifth lens having a negative refractive power
Data Source
AI summary
Disclosed is a camera optical lens, comprising, from an object side to an image side in sequence: 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; and a fifth lens having a negative refractive power; wherein, the camera optical lens satisfies: 12.50≤f3/f≤20.00; 0.30≤(R3+R4)/(R3−R4)≤1.00; and 0.30≤d5/d6≤0.50; where, f denotes a focus length of the camera optical lens; f3 denotes a focus length of the third lens; R3 and R4 denote central curvature radii of an object side surface and an image side surface of the second lens respectively; d5 denotes an on-axis thickness of the third lens; and d6 denotes an on-axis distance from the image side surface of the third lens to an object side surface of the fourth lens.