Five-Lens Camera Optical Lens Design for Ultra-Thin Wide-Angle Imaging
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Solution Overview
Problem
Current camera optical lenses for handheld devices fail to meet the design requirements of large aperture, wide angle, and ultra-thinness while maintaining good optical performance.
Innovation Solution
A camera optical lens design comprising five lenses with specific refractive power distributions and curvature radius ratios, optimized to correct aberrations and achieve ultra-thinness, featuring a configuration where the first lens has a positive refractive power, the second has a negative power, and subsequent lenses have positive or negative powers, with precise focal length and curvature radius conditions to ensure optimal performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a five-piece lens structure is adopted to improve imaging quality, then optical performance is improved, but the lens thickness and complexity increase
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive powers (f1, f2, f3, f4, f5) and curvature radii (R1-R10) of the five lens elements to satisfy specific mathematical relationships. This allows the five-piece lens to achieve excellent optical performance while maintaining ultra-thin profile through optimized parameter selection rather than simply reducing the number of elements.
Solution Approach 2:
Each lens element is designed with specific local optical properties - the first lens has positive refractive power with specific curvature characteristics, the second has negative refractive power, and so on. This local optimization of each element's quality allows the overall system to achieve both thinness and high optical performance.
2Illumination intensity
If aperture is increased to improve light gathering capability, then imaging quality is improved, but lens complexity and difficulty of aberration correction increase
Solution Approach 1:
The patent controls the aperture and related parameters through precise mathematical relationships between the focal lengths and curvature radii of the five lens elements. The specified parameter ranges ensure that the lens can achieve large aperture with FNO≤2.30 while maintaining aberration correction and manageable complexity.
3Area of stationary object
If field of view is increased to achieve wide angle, then imaging coverage is improved, but optical performance and aberration control deteriorate
Solution Approach 1:
The patent achieves wide angle field of view (FOV≥75°) while maintaining excellent optical performance by carefully selecting and coordinating the parameters of all five lens elements. The mathematical relationships between focal lengths and curvature radii are optimized to expand the field of view without sacrificing image quality or introducing excessive aberrations.
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 design effectively meets the requirements of large aperture, wide angle, and ultra-thinness while providing excellent optical performance, suitable for high-pixel CCD and CMOS camera elements in mobile devices.
Implementation Method 1
A camera optical lens comprises, from an object side to an image side: a first lens having a positive refractive power; a second lens having a negative 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
Data Source
AI summary
The present disclosure provides a camera optical lens satisfying following conditions: −0.50≤f1/f2≤−0.3; 50.00≤f3/f≤75.0; −2.40≤(f2+f5)/f≤−2.00; 0.70≤(R3+R4)/(R3−R4)≤0.95; 1.30≤(R7+R8)/(R7−R8)≤1.60; and 0.40≤(R9+R10)/(R9−R10)≤0.75; where f denotes a focal length of the camera optical lens; f1, f2, f3 and f5 respectively denote a focal length of a first, second, third and fifth lenses; R3 and R4 respectively denote a curvature radius of an object-side surface and an image-side surface of the second lens; R7 and R8 respectively denote a curvature radius of an object-side surface and an image-side surface of a fourth lens; and R9 and R10 respectively denote a curvature radius of an object-side surface and an image-side surface of the fifth lens. The camera optical lens in the present disclosure satisfies a design requirement of large aperture, wide angle and ultra-thinness while having good optical performance.