Five-Lens Optical Assembly for Large Aperture and High Resolution
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Solution Overview
Problem
Current lens assemblies fail to simultaneously achieve a large field of view, large aperture, and high resolution while maintaining good optical performance.
Innovation Solution
A lens assembly comprising specific configurations of lenses with negative and positive refractive powers, including aspheric surfaces, arranged along an optical axis with a stop between certain lenses, satisfying specific conditions for curvature and focal lengths to enhance optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional lens assembly structures are used, then manufacturing and design are simpler, but the field of view, aperture, and resolution cannot simultaneously achieve large values with good optical performance
Solution Approach 1:
The lens assembly is divided into five distinct lens elements with alternating positive and negative refractive powers. Each lens element has specific surface curvature characteristics (convex or concave surfaces facing object/image sides) that are optimized independently to collectively achieve large field of view, large aperture, and high resolution while maintaining controllable aberrations
Solution Approach 2:
The patent applies multiple mathematical conditions involving radius of curvature (R values), effective focal lengths (f values), and refractive indices (Nd values) of different lens elements. These parameter relationships are carefully controlled to optimize optical performance, enabling the system to achieve large aperture and field of view while correcting aberrations through coordinated parameter adjustments across all lens elements
2Manufacturing precision
If lens configuration is optimized for large aperture and high resolution, then optical performance improves, but aberration correction becomes more difficult
Solution Approach 1:
The lens elements feature asymmetric surface configurations where specific surfaces are convex or concave relative to object or image sides. The fourth lens element is specified as an aspheric lens without inflection points, introducing asymmetric geometry to correct spherical aberration and other monochromatic aberrations that arise from high-aperture, high-resolution requirements
Solution Approach 2:
Multiple mathematical conditions are imposed on the system parameters including radius of curvature ratios, focal length relationships, and refractive index combinations. These parameter constraints are designed to balance and correct various types of aberrations while maintaining large aperture and high resolution capabilities
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 assembly achieves a larger field of view, higher resolution, and improved optical performance with corrected aberrations, meeting the requirements of a larger aperture and high resolution.
Implementation Method 1
The first lens has negative refractive power. The second lens has positive refractive power. The third lens has negative refractive power. The fourth lens has positive refractive power. The fifth lens has positive refractive power.
Data Source
AI summary
A lens assembly includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens are arranged in order from an object side to an image side along an optical axis. The first lens has negative refractive power. The second lens has positive refractive power. The third lens has negative refractive power and includes a convex surface facing the image side. The fourth lens has positive refractive power and includes a concave surface facing the object side. The fifth lens has positive refractive power and includes a concave surface facing the image side.