Five-Lens Camera Optical Lens Design for Aberration Correction
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Solution Overview
Problem
Conventional camera lenses for handheld devices face challenges in achieving a balance between large aperture, wide angle, and ultra-thinness while maintaining good optical performance, due to unreasonable design in focal power, lens spacing, and lens shape.
Innovation Solution
A five-lens camera optical lens design with specific refractive power configurations and curvature radius ratios, along with optimized focal lengths and thicknesses, is proposed to address these challenges, ensuring improved imaging quality and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a three-piece or four-piece lens structure is used, then good optical performance is achieved, but the lens cannot meet the requirements for large aperture, wide angle, and ultra-thinness simultaneously
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each lens to be optimized for specific functions: the first positive lens for light gathering, the negative lens for aberration correction, the second positive lens for focusing, and the final negative lens for field curvature correction. This five-element configuration enables simultaneous achievement of large aperture, wide angle, and ultra-thinness while maintaining excellent optical performance.
2Length of moving object
If the lens structure is made thinner to meet ultra-thinness requirements, then the overall device size is reduced, but optical performance deteriorates
Solution Approach 1:
The patent employs precise parameter optimization including specific curvature radius ratios ((R1+R2)/(R1-R2) between -0.40 and -0.20, (R3+R4)/(R3-R4) between 1.50 and 2.00, (R5+R6)/(R5-R6) between 1.20 and 1.80), thickness ratios (d3/d2 between 1.52 and 1.80), and focal length ratios (f1/f2 between -0.70 and -0.50). These parameter changes enable the ultra-thin lens structure to achieve excellent optical performance by optimizing the balance between lens thickness and aberration correction capabilities.
3Illumination intensity
If the aperture is increased to improve light gathering capability, then imaging quality in low light is improved, but lens complexity and difficulty in correcting aberrations increase
Solution Approach 1:
The patent converts the harmful effect of increased aberrations from large aperture into a benefit by strategically placing negative refractive power lenses at specific positions. The negative lenses, positioned after the positive light-gathering lenses, effectively correct the spherical and chromatic aberrations generated by the large aperture design. This configuration transforms the potential harm of high aperture-induced aberrations into a benefit where the aberrations are systematically corrected, enabling FNO≤1.95 with excellent optical performance.
4Area of moving object
If the field of view is widened to capture more scene, then the imaging coverage is increased, but distortion and aberration correction becomes more difficult
Solution Approach 1:
The patent uses a composite lens structure combining five different lens elements with alternating positive and negative refractive powers, each with specifically optimized curvature radii and thicknesses. This composite structure enables effective correction of spherical aberration, chromatic aberration, and field curvature while achieving a wide field of view (FOV≥79°). The combination of different lens types creates a synergistic effect that simultaneously achieves wide coverage and high imaging precision.
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 excellent optical performance, making it suitable for high-pixel imaging devices like smartphones and webcams, while effectively correcting spherical and chromatic aberrations.
Implementation Method 1
a first lens having a positive refractive power
Implementation Method 2
a second lens having a negative refractive power
Implementation Method 3
a third lens having a positive refractive power
Implementation Method 4
a fourth 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; and a fourth lens having a negative refractive power; the camera optical lens satisfies: −0.40≤(R1+R2)/(R1−R2)≤−0.20; 1.50≤(R3+R4)/(R3−R4)≤2.00; 1.20≤(R5+R6)/(R5−R6)≤1.80; and 1.52≤d3/d2≤1.80; where, R1 and R2 denote central curvature radii of object and image side surfaces of the first lens respectively; R3 and R4 denote central curvature radii of object and image side surfaces of the second lens respectively; R5 and R6 denote central curvature radii of object side surface and image side surface of the third lens respectively; d2 denotes an on-axis distance from image side surface of first lens to object side surface of second lens L2; and d3 denotes an on-axis thickness of the second lens.