Eight-Element Optical Imaging Lens for Large Aperture and Resolution
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Solution Overview
Problem
Existing optical imaging lenses face challenges in achieving high resolution, large aperture stop, and compact size due to difficulties in design complexity and increased pixel count, particularly when incorporating a large aperture stop.
Innovation Solution
An optical imaging lens design comprising eight lens elements with specific convex and concave surface configurations and refracting powers, including a concave optical axis region of the first lens element, negative refracting power of the second lens element, and positive refracting power of the seventh lens element, while adhering to specific inequalities to enhance resolution and image height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the aperture stop is enlarged to accept more imaging rays, then the resolution is improved, but the design complexity increases
Solution Approach 1:
The optical imaging lens is divided into eight lens elements with different refracting powers and surface configurations. Each lens element is optimized to perform specific functions: the first lens element with positive refracting power and concave optical axis region controls spherical aberration, the second and third lens elements with negative refracting power correct chromatic aberration, and subsequent elements fine-tune image quality. This segmentation allows the system to achieve high resolution with enlarged aperture stop while distributing design complexity across multiple specialized components rather than requiring one complex element.
2Measurement precision
If the number of pixel is increased to force the resolution of lens to be raised, then the resolution is improved, but the design becomes more difficult
Solution Approach 1:
Different regions of the lens elements are designed with specific surface configurations to address local optical quality requirements. The first lens element features a concave optical axis region on its image-side surface to control spherical aberration in the central field, while peripheral regions of various lens elements have convex or concave configurations to correct off-axis aberrations. This local optimization ensures high resolution across the entire image sensor array, accommodating increased pixel count without proportionally increasing overall design difficulty.
3Measurement precision
If lens elements are added to promote resolution and enlarge aperture stop, then the imaging quality is improved, but the system length increases
Solution Approach 1:
The patent utilizes aspherical surface configurations on multiple lens elements to achieve three-dimensional optimization of the optical path. By introducing complex surface geometries with varying curvature radii, the design compacts the optical system in the axial direction while maintaining large aperture stop and high resolution performance. The aspherical surfaces enable more efficient light ray control, reducing the required system length compared to traditional spherical lens designs with the same performance specifications.
4Measurement precision
If the aperture stop is enlarged, then more imaging rays are accepted, but the manufacturing precision requirements increase
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element to balance manufacturing feasibility with optical performance. The focal lengths are constrained within specific ranges (f1=3.800-4.200mm, f2=-2.800 to -3.200mm, f3=-2.800 to -3.200mm, f7=2.800-3.200mm), and the ratio of key parameters is controlled (0.800≤f1/f7≤1.200). These parameter constraints ensure that the enlarged aperture stop design remains manufacturable while achieving high resolution, as the standardized parameter ranges facilitate precision manufacturing processes.
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 achieves increased resolution, enlarged aperture stop, and improved imaging quality with a slim and compact appearance by optimizing lens element configurations and refracting powers, reducing aberrations and system length.
Implementation Method 1
Each of the first, second, third, fourth, fifth, sixth, seventh and eighth lens elements may also have an object-side surface facing toward the object side and allowing imaging rays to pass through. Each of the first, second, third, fourth, fifth, sixth, seventh and eighth lens elements may also have 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. Through designing concave and/or convex surfaces of the lens elements, the optical imaging lens may increase resolution, increase aperture stop and image height, and maintain well image quality.