Eight-Lens Optical Imaging System with Aspherical Elements for Compact Design
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Solution Overview
Problem
Optical imaging lenses face challenges in achieving a balance between being thin, short, and lightweight while maintaining good image quality and a large field of view, as increasing the number of lenses can elongate the lens system, which is undesirable for mobile devices.
Innovation Solution
The design of an optical imaging lens with at least eight lens elements, where the convex or concave shape of the surfaces is controlled to shorten the lens length and expand the field of view, while maintaining good optical characteristics, by optimizing the thickness and refracting power of each lens element and adjusting air gaps between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of optical lenses is increased to improve image quality, then imaging quality is improved, but the distance from the object-side surface of the first lens to the image plane increases, making the lens system longer
Solution Approach 1:
The patent applies parameter changes by precisely controlling the thickness and refractive index of each lens element, as well as the air gaps between them. Specific parameter ranges are defined (e.g., 0.2mm < T1 < 0.5mm, 1.5 < n1 < 2.0) to optimize the optical path and reduce overall system length while maintaining imaging quality. This allows the lens system to achieve compact dimensions without sacrificing optical performance
Solution Approach 2:
The patent utilizes aspherical surfaces on multiple lens elements to correct optical aberrations more effectively than spherical surfaces. The aspherical design allows for better control of light rays, reducing the need for additional lens elements and enabling a more compact lens system while maintaining high imaging quality across the entire field of view
2Adaptability or versatility
If the number of optical lenses is increased to expand field of view, then field of view is enlarged, but the distance from the object-side surface of the first lens to the image plane increases
Solution Approach 1:
Aspherical surfaces are employed on multiple lens elements to effectively manage wide-angle light rays. The varying curvature allows for broader field of view coverage while maintaining image quality at the edges, and enables a shorter overall lens length compared to traditional spherical designs which would require more elements to achieve the same field of view
Solution Approach 2:
Different regions of the lens surfaces (optical axis region vs. peripheral region) are designed with different curvatures and refractive properties. This local optimization allows the lens to handle both on-axis and off-axis light rays effectively, expanding the usable field of view while keeping the lens system compact
3Length of stationary object
If the lens system is made thinner and shorter, then device compactness is improved, but image quality and aberration correction deteriorate
Solution Approach 1:
Aspherical surfaces provide superior aberration correction in a compact form factor. By using aspherical designs on multiple elements, the patent achieves effective control of spherical aberration, coma, and other distortions without requiring a long optical path, thus maintaining high image quality in a thin and short lens system
Solution Approach 2:
The patent employs precise parameter optimization including specific thickness ranges, refractive index ranges, and air gap dimensions to achieve compact size while correcting aberrations. The coordinated adjustment of these parameters across all lens elements enables effective aberration correction in a shortened optical path
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 lens system length and enlarges the field of view while maintaining excellent imaging quality, correcting spherical aberrations and reducing distortion, thus addressing the limitations of existing designs.
Implementation Method 1
The first lens element may have positive refracting power... n1 A refractive index of the first lens element... The optical imaging lens may comprise 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, a ninth lens element and an eighth lens element sequentially from an object side to an image side along an optical axis
Data Source
AI summary
An optical imaging lens may include a first, a second, a third, a fourth, a fifth, a sixth, a seventh, a ninth and an eighth lens elements positioned in an order from an object side to an image side. Through designing concave and/or convex surfaces of each lens elements, the optical imaging lens may provide improved imaging quality and optical characteristics, reduced length of the optical imaging lens and increased field of view while the optical imaging lens may satisfy at least one inequality.