Concave-Surface Eight-Element Lens Layout for Compact Imaging
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving a small F-number, large image height, and high imaging quality while maintaining a compact size.
Innovation Solution
The optical imaging lens design incorporates a specific arrangement of eight lens elements with concave-convex curved surfaces and refracting powers, satisfying conditions such as D52t81/D41t52≥1.950, D52t81/D41t52≥3.000, or D52t81/D41t52≥3.000, to achieve a small F-number and large image height with excellent imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens is designed to be light, thin, short, and small, then the device size is reduced, but the F-number increases and imaging quality deteriorates
Solution Approach 1:
The lens is divided into eight separate lens elements (first lens element, second lens element, third lens element, fourth lens element, fifth lens element, sixth lens element, seventh lens element, and eighth lens element) arranged sequentially along the optical axis. This segmentation allows each element to be optimized for specific optical functions while maintaining overall compactness, resolving the contradiction between small volume and good imaging quality.
Solution Approach 2:
The patent introduces a specific spatial arrangement dimension by defining the ratio relationship between distances D52t81 and D41t52 (where D52t81/D41t52≥1.950). This dimensional constraint on the spacing between lens elements enables optimization of optical paths within a compact volume, achieving both small F-number and high imaging quality without increasing overall lens size.
2Illumination intensity
If the F-number is reduced to increase luminous flux, then light gathering ability is improved, but the lens size and complexity increase
Solution Approach 1:
Different lens elements are assigned different refracting powers and surface curvatures tailored to their specific positions and functions. The second lens element has negative refracting power while the seventh has positive refracting power, and various surfaces are concave or convex in specific regions. This local optimization allows achieving small F-number with controlled complexity.
Solution Approach 2:
The patent optimizes specific parameters including the ratio D52t81/D41t52≥1.950, the refracting powers of individual elements, and the concave/convex configurations of specific surfaces. By carefully adjusting these parameters, the lens achieves small F-number and high luminous flux while maintaining manageable structural complexity through the eight-element design.
3Measurement precision
If the image height is increased to increase pixels and resolution, then resolution is improved, but the lens size and weight increase
Solution Approach 1:
The eight-element segmented structure allows the optical system to achieve high image height and resolution through coordinated action of individual elements, distributing the optical load and enabling compact, lightweight design while maintaining high resolution capability.
Solution Approach 2:
The patent utilizes the spatial dimension by optimizing the ratio D52t81/D41t52≥1.950 to achieve large image height within a compact lens volume. This dimensional optimization allows high resolution without proportionally increasing lens weight or size.
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 enables the lens to provide a small F-number, large image height, and good imaging quality, effectively addressing the challenges of compactness and resolution.
Implementation Method 1
Each of the first lens element to the eighth lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through
Data Source
AI summary
An optical imaging lens, including 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 sequentially along an optical axis from an object side to an image side, is provided. Each lens element includes an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The second lens element has negative refracting power. An optical axis region of the object-side surface of the third lens element is concave. An optical axis region of the image-side surface of the fourth lens element is concave. An optical axis region of the object-side surface of the fifth lens element is concave. The seventh lens element has positive refracting power.