Four-Lens Camera Optical Lens for Wide-Angle Imaging
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Solution Overview
Problem
Current camera lenses for handheld devices and imaging systems face challenges in achieving optimal imaging quality due to improper lens distance and shape, which hinder the design requirements for large aperture and ultra-thin, wide-angle capabilities, especially with the increasing demand for smaller pixel sizes and improved imaging performance.
Innovation Solution
A four-piece camera optical lens structure is designed, with specific refractive power distributions and curvature radii for each lens, along with an optical filter, to balance spherical aberration, field curvature, and deflection, achieving an ultra-thin and wide-angle lens with improved imaging quality and large aperture capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a traditional three-piece lens structure is used, then the device can be kept simple, but the imaging quality deteriorates when pixel size decreases
Solution Approach 1:
The lens system is divided into four separate lens elements (first lens L1, second lens L2, third lens L3, fourth lens L4) with specific refractive power distributions. This segmentation allows each lens element to be optimized for specific optical functions, correcting various aberrations that cannot be corrected with a simple three-piece structure, thereby maintaining high imaging quality in miniaturized systems.
2Measurement precision
If a normal four-piece lens structure is used, then good optical characteristics are achieved, but the lens distance and shape are improper for large aperture and ultra-thin requirements
Solution Approach 1:
The patent optimizes specific parameters of the four-piece lens structure including the refractive powers of each lens element, their relative positions, and curvature radii. By carefully controlling parameters such as the ratio of focal lengths and distances between lens elements, the system achieves large aperture and ultra-thin profile while maintaining excellent optical characteristics. The conditional expressions define precise parameter ranges that enable this optimization.
3Ease of manufacture
If lens distance and shape are not optimized, then manufacturing is easier, but the system cannot satisfy large aperture and ultra-thin design requirements
Solution Approach 1:
Each lens element is designed with specific local characteristics including particular refractive powers, curvature radii, and positional relationships. The first lens has positive refractive power with specific object-side and image-side surface curvatures, while the second lens has negative refractive power with optimized local shape. This local optimization of each lens element's quality enables the overall system to meet stringent design requirements for large aperture and ultra-thin profile.
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 results in excellent optical performance, correcting aberrations and maintaining miniaturization, making it suitable for high-pixel camera elements in mobile devices and web cameras with a large aperture and wide-angle capabilities.
Implementation Method 1
a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4... the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, and the fourth lens L4 has a negative refractive power
Data Source
AI summary
The present invention relates to the technical field of optical lens and discloses a camera optical lens. The camera optical lens includes, 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, and a fourth lens having a negative refractive power. The camera optical lens satisfies following conditions: −3.50≤f2/f≤−1.50; 3.00≤(R3+R4)/(R3−R4)≤8.00; 8.00≤d1/d2≤15.00; 0.50≤f3/f≤0.75; −5.00≤R2/R1≤−2.50; −0.70≤f4/f≤−0.40. The camera optical lens can achieve excellent optical characteristics with a large aperture, wide-angle, and being ultra-thin.