Optical Imaging Lens Aspherical Surface Design for Compact Aperture
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Solution Overview
Problem
The challenge is to design an optical imaging lens with a small F-number, large field of view, and high image height while maintaining a thin and short lens structure, which is essential for improving pixel resolution and imaging quality in applications like cell phones, cameras, and tablets.
Innovation Solution
The optical imaging lens is designed with specific convex and concave surface shapes and refracting powers for its lens elements, controlled to satisfy certain inequalities, which allows for a reduced system length, enlarged aperture, and increased field of view and image height, while maintaining good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the lens system is designed with traditional structures to achieve adequate imaging, then the system length and aperture are constrained, but reducing system length while enlarging aperture and field of view is required for modern applications
Solution Approach 1:
The patent employs aspherical surfaces on multiple lens elements (first, second, third, fourth, fifth, sixth, and seventh lens elements) to replace traditional spherical surfaces. This curvature optimization enables better control of light paths, allowing the system to achieve a smaller F-number (larger aperture) and reduced system length simultaneously by correcting spherical aberrations and improving optical efficiency within a compact form factor.
Solution Approach 2:
The patent optimizes multiple optical parameters including the focal lengths of individual lens elements (f1, f2, f3, f4, f5, f6, f7), refractive indices (n1, n2, n3, n4, n5, n6, n7), and Abbe numbers (V1, V2, V3, V4, V5, V6, V7) to achieve the desired balance between system length, aperture size, and imaging quality. Specific inequalities are established for these parameters to ensure optimal performance.
2Area of stationary object
If the image height is increased to improve pixel and resolution, then the field of view enlarges, but the system length tends to increase
Solution Approach 1:
The patent divides the optical system into seven distinct lens elements with specific refracting powers (positive or negative) arranged in sequence. This segmentation allows each element to contribute differently to the overall optical function, enabling the system to achieve a large image height and field of view while maintaining a compact total length through optimized distribution of optical power across multiple elements.
Solution Approach 2:
The patent utilizes the seventh dimension (aspherical coefficients) by implementing aspherical surfaces on multiple lens elements. This allows control of light rays in additional spatial dimensions, enabling the system to achieve large image height and field of view without proportionally increasing system length by optimizing the three-dimensional light path control.
3Illumination intensity
If the F-number is reduced to improve luminous flux, then the aperture enlarges, but the system complexity and length increase
Solution Approach 1:
The patent designs each lens element to serve multiple functions: the first lens element with positive refracting power not only converges light but also begins aberration correction; the second lens element with negative refracting power both diverges light and corrects field curvature. This multi-functionality allows the system to achieve a small F-number for high luminous flux while maintaining relatively simple structure through seven elements rather than requiring more complex arrangements.
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
This design effectively shortens the system length, broadens the field of view, and increases image height, enhancing imaging quality and assembly yield, addressing the limitations of traditional optical imaging lenses.
Implementation Method 1
Each of the first, second, third, fourth, fifth, sixth, seventh, and eighth lens element may have an object-side surface facing toward the object side and allowing imaging rays to pass through as well as an image-side surface facing toward the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens may include a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element, a seventh lens element, and an eighth lens element positioned in an order from an object side to an image side along an optical axis. Through designing concave and/or convex surface of the lens elements, the optical imaging lens may have improved imaging quality, reduced system length, enlarged aperture stop, broad field of view and increased image height.