Optical Imaging Lens Shortening Length and Expanding HFOV
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Solution Overview
Problem
Traditional optical imaging lenses with eight lens elements are bulky and heavy, lacking sufficient aperture and view angle, making it challenging to design a compact version while maintaining good optical characteristics.
Innovation Solution
The optical imaging lens design controls the convex or concave shape of the lens elements' surfaces and adheres to specific inequalities to shorten the lens length, broaden the high field of view (HFOV) and aperture, while maintaining good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the size of each lens element is proportionally decreased to shorten the lens length, then the lens length is reduced, but the imaging quality and optical characteristics deteriorate
Solution Approach 1:
The patent applies local quality by giving each lens element specific surface shape characteristics (convex or concave) tailored to its position in the optical sequence. The first lens element has a convex object-side surface, the second has a concave image-side surface, the third has a convex object-side surface, and so on. This localized optimization of surface geometry allows the compact lens to maintain proper optical performance despite the reduced overall size.
Solution Approach 2:
The patent utilizes parameter changes by precisely controlling the curvature radii, thicknesses, and refractive indices of each lens element. Specific inequalities are imposed on these parameters (e.g., curvature radius ratios, thickness constraints) to optimize the optical path and image quality within the shortened lens structure, transforming the design space to achieve compactness without sacrificing performance.
2Length of moving object
If the lens length is shortened to achieve compact size, then the aperture and view angle are reduced, but the desired aperture and HFOV cannot be achieved
Solution Approach 1:
The patent extensively employs curved surfaces with specific curvature radii for each lens element. By optimizing the curvature of the object-side and image-side surfaces of all eight lens elements, the design achieves broad aperture and high field of view within a compact length. The aspherical surfaces help control light paths more efficiently than simple spherical surfaces.
Solution Approach 2:
The patent compensates for the reduced axial length by optimizing parameters in other dimensions - specifically the radial aperture dimensions and field angles. By carefully designing the lens element diameters and their spacing, the system achieves a broad aperture ratio and high half-field of view (HFOV) despite the shortened overall length, effectively redistributing the optical performance across different dimensional parameters.
3Reliability
If the lens elements are arranged with sufficient spacing to maintain optical performance, then the lens length increases, but compact design is compromised
Solution Approach 1:
The patent merges the functions of multiple lens elements into a tightly integrated sequence with minimized spacing. By combining the optical functions of eight lens elements in a compact arrangement with controlled air gaps, the design achieves sufficient optical performance without requiring excessive length. The cumulative effect of the lens sequence compensates for the reduced individual element spacing.
Solution Approach 2:
The patent segments the optical system into eight distinct lens elements with specific functions assigned to each position in the sequence. This segmentation allows for optimized light control at each stage of the optical path, enabling compact spacing while maintaining overall optical performance. Each lens element segment contributes specifically to correcting aberrations and focusing light, allowing efficient use of the available axial space.
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 approach effectively shortens the optical imaging lens length, enlarges the HFOV, and reduces the f-number, achieving better imaging quality and system functionality.
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 and an image-side surface facing toward the image side and allowing the imaging rays to pass through
Data Source
AI summary
The present disclosure provides for various embodiments of optical imaging lenses. An optical imaging lens may comprise at least eight lens elements positioned in an order from an object side to an image side. By controlling the convex or concave shape of the surfaces of the lens elements and designing parameters satisfying at least an inequality, the optical imaging lens may exhibit improved optical characteristics, the total length of the optical imaging lens may be shortened, and the view angle and f-number may also be improved.