Camera Optical Lens Aperture and Thinness Optimization
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Solution Overview
Problem
Conventional camera lenses for handheld devices and imaging systems face challenges in achieving large aperture, ultra-thinness, and wide angle while maintaining good optical functions, due to suboptimal optical focal degree, lens spacing, and shape settings.
Innovation Solution
A camera optical lens design comprising multiple lenses with specific refractive powers and curvature radii, adhering to defined ratios and ranges to optimize focal lengths, thicknesses, and curvature relationships, ensuring improved imaging quality and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a four-piece lens structure is used to achieve good optical functions, then imaging quality is improved, but the lens cannot satisfy large aperture, ultra-thinness and wide angle requirements
Solution Approach 1:
The patent applies parameter changes by optimizing the focal length ratios between lenses (f2/f, f3/f, f4/f), curvature radius ratios (R3/R4, (R5+R6)/(R5-R6)), and thickness ratios (d1/TTL, d3/TTL, d5/TTL). These parameter adjustments enable the four-piece lens to achieve large aperture (FNO≤1.34), wide angle (FOV≥70°), and ultra-thinness (TTL≤3.5mm) while maintaining good imaging quality through precise control of optical parameters.
2Volume of moving object
If the pixel area of photosensitive devices is reduced to achieve miniaturization, then device size is reduced, but imaging quality requirements become more stringent
Solution Approach 1:
The patent divides the optical system into four distinct lens components with specific refractive powers (first lens: positive, second lens: positive, third lens: positive, fourth lens: negative). Each lens segment is optimized with specific focal length ratios and curvature characteristics to collectively achieve high imaging quality suitable for small-pixel photosensitive devices while maintaining miniaturization.
Solution Approach 2:
The patent employs parameter changes by establishing specific ratio ranges for focal lengths (f2/f: 3.00-50.00, f3/f: 0.50-1.00, f4/f: -3.77 to -0.88), curvature radii (R3/R4: 5.00-50.00), and thicknesses (d1/TTL: 0.05-0.19, d3/TTL: 0.07-0.21). These parameter optimizations enable the lens to deliver excellent imaging performance for high-pixel-density photosensitive devices in compact form factors.
3Ease of manufacture
If traditional lens structure settings are used, then manufacturing is simpler, but optical focal degree, lens spacing and lens shape are suboptimal for modern requirements
Solution Approach 1:
The patent optimizes manufacturing parameters by defining specific ratio ranges for focal lengths, curvature radii, and thicknesses that balance manufacturing feasibility with optical performance. The four-piece lens structure with controlled parameter variations allows for standardized production processes while achieving superior optical functions including large aperture, wide angle, and ultra-thinness.
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 with a large aperture and wide angle, suitable for high-pixel CCD and CMOS camera elements, particularly in web camera and mobile phone applications, while maintaining a compact form factor.
Implementation Method 1
a first lens having a positive refractive power, a second lens having a positive refractive power, a third lens having a positive refractive power, and a fourth lens having a negative refractive power
Data Source
AI summary
The present disclosure relates to a camera optical lens satisfying following conditions: 3.00≤f2/f≤5.00, 13.00≤d5/d6≤25.00, 3.00≤(R5+R6)/(R5−R6)≤10.00, and 5.00≤R3/R4≤50.00; where f denotes an overall focal length of the camera optical lens, f2 denotes a focal length of a second lens, d5 denotes an on-axis thickness of a third lens, d6 denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of a fourth lens, R5 and R6 respectively denote a curvature radius of an object-side surface and the image-side surface of the third lens, and R3 and R4 respectively denote a curvature radius of an object-side surface and an image-side surface of the second lens. The camera optical lens in the present disclosure satisfies a design requirement of large aperture and wide angle while having good optical functions.