Five-Element Camera Lens for Large Aperture and Ultra-Thin Design
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Solution Overview
Problem
Current camera lenses for handheld devices and imaging systems face challenges in achieving optimal optical performance, particularly in meeting design requirements for large aperture, wide angle, and ultra-thin configurations while maintaining good imaging quality.
Innovation Solution
A five-piece camera optical lens design is proposed, comprising lenses with specific refractive powers and curvature radii, optimized through precise focal length and on-axis distance ratios, and material selection to balance spherical aberration, field curvature, and chromatic aberration, ensuring a large aperture, wide angle, and ultra-thin form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a three-piece or four-piece lens structure is used, then the device complexity is reduced, but the imaging quality deteriorates
Solution Approach 1:
The patent divides the lens system into five distinct lens elements with alternating positive and negative refractive powers. This segmentation allows each element to perform specific optical functions, correcting various aberrations independently and achieving superior imaging quality that cannot be obtained with fewer elements.
Solution Approach 2:
The patent specifies precise parameter ranges for each lens element including focal length ratios (f1/f, f2/f4, f5/f), curvature radii ratios ((R1+R2)/(R1-R2), (R3+R4)/(R3-R4)), and thickness ratios (d1/TTL, d3/TTL, d5/TTL). By optimizing these parameters within defined ranges, the patent achieves excellent optical performance while maintaining reasonable structural complexity.
2Illumination intensity
If the aperture is increased to improve light gathering, then the lens diameter increases, but the device thickness increases
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements, defined by conic coefficients and higher-order aspheric coefficients. These curved surfaces enable better light control and reduced aberrations, allowing for a larger effective aperture without proportionally increasing the overall lens thickness.
Solution Approach 2:
The patent optimizes the ratio of lens thickness to total track length (TTL) for each element, specifying that d1/TTL should be between 0.06-0.21, d3/TTL between 0.02-0.07, and d5/TTL between 0.04-0.12. These parameter constraints ensure the lens achieves large aperture while maintaining ultra-thin profile.
3Adaptability or versatility
If the field of view is widened to capture more scene, then the angle increases, but the distortion and aberration increase
Solution Approach 1:
The five-element structure with alternating positive and negative powers allows different zones of the lens system to correct different types of aberrations. The negative power elements specifically counteract the distortion and field curvature introduced by the wide-angle design, enabling FOV≥79° while maintaining image quality.
Solution Approach 2:
The patent defines specific parameter ranges including focal length ratios (f2/f4 between 0.55-1.00, f5/f between 5.50-10.00) and curvature ratios ((R3+R4)/(R3-R4) between 0.01-2.72, (R7+R8)/(R7-R8) between 0.28-6.44) that optimize the lens for wide-angle performance while controlling distortion and aberration.
4Length of stationary object
If the lens elements are moved closer to reduce thickness, then the device thickness is reduced, but the optical performance deteriorates
Solution Approach 1:
The patent specifies precise spacing ratios between lens elements: d6/d8 should be between 1.80-3.20, d4/d2 should be between 2.50-7.00, where d2, d4, d6 represent on-axis distances between consecutive lens elements. These optimized spacing ratios allow compact arrangement while maintaining proper optical path for aberration correction.
Solution Approach 2:
The aspherical surfaces on the lens elements enable more compact spacing between elements by providing better wavefront control. The conic coefficients and aspheric coefficients allow the light rays to be properly directed even with reduced element spacing, maintaining optical performance in the ultra-thin configuration.
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 excellent optical performance, meeting the requirements for a large aperture, wide angle, and ultra-thinness, making it suitable for high-pixel CCD and CMOS camera lenses, with improved imaging quality and reduced 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 fourth lens having a negative refractive power
Implementation Method 4
a fifth lens having a positive refractive power
Data Source
AI summary
A camera optical lens includes five-piece lenses, from an object side to an image side, the five-piece lenses are: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens, a fourth lens having a negative refractive power and a fifth lens having a positive refractive power. The camera optical lens satisfies conditions of 0.60≤f1/f≤0.90, 1.80≤d6/d8≤3.20, 0.55≤f2/f4≤1.00, and 5.50≤f5/f≤10.00. Here f denotes a focal length of the camera optical lens, d6 denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of the fourth lens, and d8 denotes an on-axis distance from an image-side surface of the fourth lens to an object-side surface of the fifth lens. The camera optical lens of the present disclosure has excellent optical performances, and meanwhile can meet design requirements of a large aperture, a wide angle and ultra-thin.