Five-Lens Camera Optical Lens Design for Wide-Angle Imaging
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Solution Overview
Problem
Conventional camera lenses with five-piece structures face challenges in achieving high optical performance while meeting requirements for wide-angle and ultra-thin lenses with large apertures due to irrational refractive power settings, lens spacing, and shape, leading to issues with aberrations and imaging quality.
Innovation Solution
A camera optical lens design comprising five lenses with specific refractive power distributions and curvature radii, including aspherical surfaces, to correct aberrations and optimize imaging quality, with conditions such as 0.80≤f1/f≤0.90 and 70.00≤f3/f≤120.00, and surface shapes that balance refractive power and lens thickness, allowing for a field of view of at least 76.9 degrees and a total optical length to image height ratio of ≤1.50.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a five-piece lens structure is used to improve imaging quality, then optical performance is enhanced, but the lens cannot achieve wide-angle and ultra-thin requirements with large aperture due to irrational refractive power settings and lens spacing
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive power distribution across the five lenses, specifically setting the focal length ratios (0.80≤f1/f≤0.90, 70.00≤f3/f≤120.00) and adjusting lens spacing parameters (0.20≤d2/d1≤0.60, 0.30≤d4/d3≤1.20). These parameter adjustments enable the lens to achieve wide-angle (76.9° field of view) and ultra-thin characteristics while maintaining large aperture (Fno≤2.05) and high imaging quality
Solution Approach 2:
The patent employs aspherical surfaces on multiple lens elements to correct aberrations and improve imaging quality. The aspherical design allows for better control of light rays, enabling the compact five-piece structure to achieve wide-angle performance and reduced thickness while maintaining optical excellence
2Device complexity
If traditional three-piece or four-piece lens structures are used, then the lens structure is simpler, but imaging quality is insufficient for modern photosensitive devices with smaller pixel sizes
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive power distributions, allowing each element to contribute to correcting different types of aberrations. This segmentation enables superior imaging quality for modern small-pixel sensors while maintaining a relatively compact structure compared to traditional designs
3Ease of manufacture
If lens spacing and shape are not optimized, then manufacturing is easier, but aberrations increase and imaging quality deteriorates
Solution Approach 1:
The patent establishes specific parameter ranges for lens spacing (d2/d1, d4/d3 ratios) and refractive power distributions that balance manufacturing feasibility with optical performance. These parameter optimizations ensure that standard manufacturing processes can produce the lens while achieving corrected aberrations and high 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
The design achieves high optical performance, correcting aberrations and enhancing imaging quality for wide-angle and ultra-thin lenses with large apertures, effectively addressing the limitations of conventional five-piece lens structures.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5... an object side surface of the first lens L1 is a convex surface and an image side surface of the first lens L1 is a concave surface
Data Source
AI summary
The present disclosure relates to the field of optical lenses and provides a camera optical lens. The camera optical lens includes, from an object side to an image side: an aperture; 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. The camera optical lens satisfies following conditions: 0.80≤f1/f≤0.90; 70.00≤f3/f≤120.00; and −450.00≤(R5+R6)/(R5−R6)≤−430.00, where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f3 denotes a focal length of the third lens; R5 denotes a curvature radius of an object side surface of the third lens; and R6 denotes a curvature radius of an image side surface of the third lens.