Five-Lens Camera Optical Lens Design for Ultra-Thin Wide-Angle Aperture
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Solution Overview
Problem
Traditional camera optical lenses fail to achieve high optical performance while meeting the requirements for ultra-thin, wide-angle, and large-aperture designs, particularly in handheld devices like smartphones and digital cameras.
Innovation Solution
A camera optical lens configuration comprising five lenses with specific refractive powers and curvature radii ratios, optimized to achieve improved imaging quality, including a negative first lens, positive second and third lenses, positive fourth lens, and negative fifth lens, with precise focal length and curvature radius relationships to correct aberrations and ensure ultra-thin, wide-angle performance.
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 optical system into five distinct lens elements with specific refractive power distributions (negative-positive-positive-positive-negative). This segmentation allows each lens to perform specific optical functions, correcting various aberrations independently and achieving superior imaging quality that cannot be obtained with fewer elements.
2Device complexity
If traditional five-piece lens settings are used, then the lens structure is established, but the optical performance deteriorates in ultra-thin wide-angle designs
Solution Approach 1:
The patent applies specific parameter constraints to optimize optical performance: focal length ratios (2.50≤f3/f≤6.00, −1.50≤f5/f4≤−1.00), curvature radius ratios (−2.00≤R4/R3≤−1.00), and thickness ratios (1.00≤d1/d2≤1.80). These parameter optimizations enable the lens to achieve high optical performance in ultra-thin wide-angle configurations.
Solution Approach 2:
The patent employs asymmetric lens design where the first and fifth lenses have negative refractive powers while the second, third, and fourth lenses have positive refractive powers. This asymmetric distribution of refractive powers allows for better correction of off-axis aberrations and enables wide-angle performance.
3Illumination intensity
If the aperture is increased, then the light gathering ability is improved, but the lens thickness increases
Solution Approach 1:
The patent optimizes the ratio of lens thickness to total optical length (0.04≤d1/TTL≤0.17) to achieve ultra-thin design while maintaining large aperture (FNO≤2.23). The specific thickness ratios and focal length relationships allow the lens to gather sufficient light without increasing overall thickness.
4Area of stationary object
If the field of view is widened, then the coverage is improved, but the aberration correction becomes more difficult
Solution Approach 1:
The five-lens segmented structure allows different lens elements to correct different types of aberrations. The negative-powered first and fifth lenses specifically address off-axis aberrations, enabling wide field of view (FOV≥119°) while maintaining good aberration correction.
Solution Approach 2:
The asymmetric refractive power distribution with negative-positive-positive-positive-negative configuration enables effective correction of coma and astigmatism across wide angles, achieving FOV≥119° with maintained 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 lens configuration achieves high optical performance with a large aperture and wide field of view, suitable for high-pixel camera systems, effectively addressing the limitations of traditional lenses in achieving ultra-thin, wide-angle, and large-aperture designs.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5, which are arranged sequentially from an object side to an image side. The first lens has a negative refractive power, the second lens has a positive refractive power, the third lens has a positive refractive power, the fourth lens has a positive refractive power, and the fifth lens has a negative refractive power
Data Source
AI summary
A camera optical lens includes, from an object side to an image side: a first lens having a negative refractive power; a second lens having a positive 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. 2.50≤f3/f≤6.00, −2.00≤R4/R3≤−1.00, and 1.00≤d1/d2≤1.80. f denotes a focal length of the camera optical lens; f3 denotes a focal length of the third lens; R3 denotes a curvature radius of an object-side surface of the second lens; R4 denotes a curvature radius of an image-side surface of the second lens; d1 denotes an on-axis thickness of the first lens; d2 denotes an on-axis distance from an image-side surface of the first lens to an object-side surface of the second lens. The camera optical lens can achieve good optical performance while achieving ultra-thin, wide-angle lenses having large apertures.