Four-Lens Camera Optical Lens Wide-Angle Aberration Correction
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Solution Overview
Problem
Conventional camera optical lenses with a four-piece lens structure fail to meet the design requirements for wide-angle imaging due to unreasonable refractive power, lens spacing, and lens shape settings, resulting in suboptimal optical performance.
Innovation Solution
A camera optical lens configuration comprising four lenses with specific refractive powers and curvature radii, optimized by conditions such as -2.70≤f1/f≤−1.20, -3.00≤f2/f≤−1.50, -3.50≤f4/f≤−2.00, and FOV≥102.00°, to achieve improved optical performance and wide-angle capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional four-piece lens structure is used, then the lens can be manufactured with standard design, but the optical performance and wide-angle capability are insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios (f1/f, f2/f, f4/f) within specific ranges, curvature radius ratios (R3/R4), and thickness ratios (d5/d6) to simultaneously achieve wide-angle capability (FOV≥102°) and excellent optical performance, transforming a standard four-piece lens into a high-performance wide-angle lens
2Volume of moving object
If the pixel size of photosensitive devices is reduced, then the device dimensions can be minimized, but the imaging quality requirements become more stringent
Solution Approach 1:
The patent changes the optical parameters of the four-piece lens structure, specifically setting focal length ratios within -2.70≤f1/f≤-1.20, -3.00≤f2/f≤-1.50, -3.50≤f4/f≤-2.00, and curvature radius ratio 3.00≤R3/R4≤10.00, to achieve diffraction-limited imaging quality that meets the stringent requirements of small-pixel photosensitive devices
3Reliability
If the refractive power, lens spacing and lens shape are optimized for good optical performance, then imaging quality improves, but the wide-angle design requirement is not met
Solution Approach 1:
The patent simultaneously optimizes multiple parameters including focal length ratios, curvature radius ratios (R3/R4), and lens thickness ratios (d5/d6) within specific ranges to achieve a field of view of 102° or more while maintaining excellent imaging quality, resolving the conflict between optical performance and wide-angle capability
Solution Approach 2:
The patent addresses the field of view limitation by optimizing the lens shape parameters (curvature radii R3, R4 and their ratio), effectively changing the geometric dimensions and configuration of the lens system to expand the angular coverage while preserving image 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 lens configuration provides excellent optical characteristics, including corrected aberrations and ultra-thinness, making it suitable for high-pixel CCD and CMOS camera elements in mobile devices and web cameras.
Implementation Method 1
a first lens L1 having a negative refractive power; a second lens L2 having a negative refractive power; a third lens L3 having a positive refractive power; and a fourth lens L4 having a negative refractive power
Data Source
AI summary
The present disclosure discloses a camera optical lens satisfying following conditions: −2.70≤f1/f≤−1.20; −3.00≤f2/f≤−1.50; −3.50≤f4/f≤−2.00; 3.00≤R3/R4≤10.00; and 3.00≤d5/d6≤6.00; where f denotes a focal length of the camera optical lens; f1 denotes a focal length of the first lens; f2 denotes a focal length of the second lens; f4 denotes a focal length of the fourth lens; R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; d5 denotes an on-axis thickness of the third lens; and d6 denotes an on-axis distance from an image-side surface of the third lens L3 to an object-side surface of the fourth lens L4. The camera optical lens provided in the present disclosure satisfies a design requirement of wide angle while having good optical functions.