Seven-Element Camera Lens for Wide-Angle Aberration Correction
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Solution Overview
Problem
The challenge is to develop a miniaturized camera optical lens with excellent optical characteristics such as large aperture, wide-angle, ultra-thin, and sufficient aberration correction, suitable for handheld devices like smartphones and digital cameras, while meeting the demands of high sensor matching and diversified structural design.
Innovation Solution
A camera optical lens design comprising seven lenses, each with specific refractive powers and surface curvatures, adhering to a set of relational expressions to optimize aberration correction, aperture size, and structural design, including the use of glass and plastic materials for lenses to reduce chromatic aberration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-lens structure is used to improve imaging quality, then aberration correction is improved, but device complexity increases
Solution Approach 1:
The optical lens system is divided into seven individual lens elements with alternating positive and negative refractive powers. Each lens element is designed with specific surface curvatures and materials to correct particular types of aberrations, allowing the complex correction task to be distributed across multiple specialized components rather than requiring a single complex lens.
Solution Approach 2:
The patent employs different glass materials with varying refractive indices and Abbe numbers for different lens elements. Specifically, lenses with positive refractive power use materials with higher Abbe numbers while lenses with negative refractive power use materials with lower Abbe numbers, creating a composite material system that effectively corrects chromatic and spherical aberrations across the entire optical system.
2Volume of moving object
If the pixel size of the optical sensor is reduced to achieve miniaturization, then device size is reduced, but imaging quality deteriorates
Solution Approach 1:
The patent employs aspheric surfaces for multiple lens elements, where the surface curvature varies continuously from the optical axis to the periphery. This allows for more precise control of light ray paths compared to spherical surfaces, enabling effective aberration correction in a compact seven-lens configuration that maintains high imaging quality despite reduced sensor size.
3Length of moving object
If an ultra-thin design is implemented to meet portability requirements, then device thickness is reduced, but optical performance deteriorates
Solution Approach 1:
The patent compensates for the limited thickness in the optical path direction by optimizing the lateral dimensions and surface curvatures of each lens element. The aspheric surfaces provide additional degrees of freedom in the radial dimension, allowing effective aberration correction without requiring increased lens thickness, thus maintaining ultra-thin profile while preserving optical performance.
4Adaptability or versatility
If a wide-angle design is used to increase field of view, then angular coverage is improved, but aberration correction becomes more difficult
Solution Approach 1:
The patent applies different material properties and surface curvature characteristics to different lens elements based on their specific functional requirements. Lenses closer to the object side have different design parameters than those closer to the image side, with each element optimized for its local position in the optical path. This localized optimization allows the system to achieve wide-angle coverage while maintaining effective aberration correction across the entire field of view.
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 achieves high definition imaging with effective aberration correction, large aperture, and wide-angle capabilities, suitable for mobile phone cameras, web cameras, and vehicle-mounted lenses, while ensuring a compact form factor and improved sensor matching.
Implementation Method 1
a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power
Data Source
AI summary
The present disclosure relates to the field of optical lens, and discloses a camera optical lens, including from an object side to an image side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having negative refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, a sixth lens having positive refractive power, and a seventh lens having negative refractive power; and the following relational expressions are satisfied: −0.300≤Sin(A1.0out14)*R14/f7≤0.003; 1.05≤(f1+f2+f3+f4)/(f5+f6+f7)≤2.30; −1.40≤Sin(A0.8out8)*R8/f4≤0.10. The camera optical lens according to the present disclosure has excellent optical characteristics of sufficient aberration correction, large aperture, wide-angle, ultra-thin, diversified structural design, and high sensor matching, and is particularly suitable for a mobile phone camera lens assembly and a WEB camera lens which are composed of camera elements such as CCD, CMOS with high definition and a vehicle-mounted lens.