Camera Optical Lens Design for Large Aperture and Ultra-Thinness
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Solution Overview
Problem
Conventional camera lenses for handheld devices struggle to achieve a balance between large aperture, wide angle, and ultra-thinness while maintaining good imaging performance, particularly in miniature camera lens designs for smartphones and digital cameras.
Innovation Solution
A camera optical lens configuration comprising three lenses with specific refractive power and curvature radius conditions, including a first lens with positive refractive power, a second lens with negative refractive power, and a third lens with positive refractive power, optimized to satisfy conditions such as focal length ratios, curvature radius ratios, and on-axis distances to achieve a large aperture, wide angle, and ultra-thinness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a camera lens is designed with large aperture and wide angle, then imaging quality is improved, but the lens thickness increases and cannot achieve ultra-thinness
Solution Approach 1:
The patent applies parameter changes by precisely controlling the focal length ratios (f1/f, f3/f, f2/f) and curvature radius ratios ((R1+R2)/(R1-R2), (R3+R4)/(R3-R4), (R5+R6)/(R5-R6)) within specific ranges. These parameter optimizations enable the lens to achieve large aperture (FNO≤2.54) and wide angle (FOV≥77°) while maintaining ultra-thin total optical length (TTL≤3.50mm), resolving the contradiction between imaging quality and thickness.
2Illumination intensity
If the lens configuration is optimized for large aperture, then aperture size is improved, but the lens complexity increases and cannot maintain simple structure
Solution Approach 1:
The patent applies local quality by assigning specific optical properties to each lens element: the first lens has positive refractive power with specific curvature ratios, the second lens has negative refractive power with specific curvature ratios, and the third lens has positive refractive power with specific curvature ratios. This localized optimization of each element's properties enables the system to achieve large aperture while maintaining manageable complexity through systematic design.
3Adaptability or versatility
If the lens is designed for wide angle, then field of view is improved, but the distortion and aberration increase and imaging performance deteriorates
Solution Approach 1:
The patent applies segmentation by dividing the optical system into three distinct lens elements with different refractive power characteristics. The first lens (positive power) handles initial light convergence, the second lens (negative power) corrects aberrations and expands field of view, and the third lens (positive power) provides final image formation. This segmentation allows each element to be optimized for specific functions, achieving wide angle (FOV≥77°) while controlling distortion and maintaining imaging performance.
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 configuration results in excellent optical performance with a large aperture, wide angle, and ultra-thinness, making it suitable for high-pixel CCD, CMOS, and WEB camera lenses, effectively addressing the design requirements for improved imaging quality in compact devices.
Implementation Method 1
a first lens L1 having positive refractive power
Implementation Method 2
a second lens L2 having negative refractive power
Implementation Method 3
a third lens L3 having positive refractive power
Data Source
AI summary
A camera optical lens is provided, including from an object side to an image side: a first lens having positive refractive power; a second lens having negative refractive power; and a third lens having positive refractive power, wherein the camera optical lens satisfies following conditions: 0.75≤f1/f≤0.95; 1.20≤f3/f≤2.00; 0≤(R1+R2)/(R1−R2)≤0.80; −3.50≤(R3+R4)/(R3−R4)≤−1.50; −8.00≤(R5+R6)/(R5−R6)≤−2.50; and 1.50≤d5/d4≤4.00. The above camera optical lens can meet design requirements for large aperture, wide angle and ultra-thinness while maintaining good imaging performance.