Eight-Element Optical Imaging Lens for Large Aperture and Compact Size
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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 and enlarged image height.
Innovation Solution
An optical imaging lens design comprising eight lens elements with specific convex and concave surface configurations and refracting powers, including positive and negative refracting powers for certain elements, to enhance resolution and image height while maintaining a slim and compact appearance.
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 for specific functions: the first lens element with positive refracting power and concave periphery region controls spherical aberration, the second and fourth 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 overly complex element.
2Measurement precision
If the number of pixels is increased to force higher resolution, 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 periphery region of the first lens element is made concave to control spherical aberration at the edges, while the optical axis region maintains convexity for proper focusing. The third lens element has a convex optical axis region on its image-side surface, and the fourth lens element has a concave optical axis region on its object-side surface. These localized surface configurations ensure high resolution across the entire image sensor area, accommodating increased pixel counts without proportionally increasing overall design difficulty.
3Measurement precision
If lens elements are added to promote resolution and enlarge aperture stop, then the resolution and aperture stop are improved, but the system length increases
Solution Approach 1:
The patent utilizes aspherical surface configurations in multiple lens elements to achieve three-dimensional control of light paths. The object-side and image-side surfaces of various lens elements incorporate aspherical profiles with different curvature radii and conic constants, enabling resolution and aperture stop enhancement without simply extending the optical path length. This dimensional approach to surface design allows compact system length while maintaining eight lens elements for high resolution.
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 image quality with a slim and compact form factor, addressing the challenges of traditional lens designs.
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, enlarge aperture stop and image height, and maintain well image quality.