Eight-Lens Optical Imaging Assembly for Compact Wide-Angle Design
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Solution Overview
Problem
The challenge is to design an optical imaging lens assembly for portable electronic devices that achieves a large image surface and high imaging quality while maintaining miniaturization, which is complicated by the need for ultra-wide angle, large focal length, and large aperture capabilities.
Innovation Solution
The optical imaging lens assembly consists of eight lenses with specific refractive powers and surface types, including aspheric surfaces, optimized to balance spherical aberration, chromatic aberration, and distortion, with carefully configured focal lengths, curvature radii, and spacing distances to ensure a large image surface and high imaging quality within a compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to adapt to portable electronic devices, then the device size is reduced, but the image surface size and imaging quality deteriorate
Solution Approach 1:
The lens assembly is divided into eight individual lens elements (first lens through eighth lens) with alternating positive and negative refractive powers. This segmentation allows each lens to contribute specifically to correcting aberrations and enabling the system to achieve a large image surface (ImgH≥7.0mm) while maintaining a compact overall form factor suitable for portable devices
Solution Approach 2:
The patent employs complex three-dimensional aspheric surface designs for all eight lens elements, utilizing higher-order aspheric coefficients (A4, A6, A8, A10, A12, A14, A16) to control light paths in multiple dimensions. This enables the compact lens assembly to achieve both miniaturization and large image surface coverage by precisely controlling ray trajectories through advanced surface geometry rather than simply increasing physical dimensions
2Volume of moving object
If the lens assembly is miniaturized, then the device size is reduced, but the machining and assembling complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for each lens element including curvature radii (R1-R16), thicknesses (d1-d8), air gaps (Air1-Air7), and aspheric coefficients (A4-A16) to optimize both manufacturability and optical performance. These controlled parameter variations enable the complex aspheric surfaces to be manufactured within standard tolerances while achieving the desired compact form factor and large image surface
3Reliability
If ultra-wide angle, large focal length, and large aperture capabilities are achieved, then the imaging performance is improved, but the lens assembly complexity increases
Solution Approach 1:
Each of the eight lens elements is designed with specific local optical properties: the first, third, fourth, sixth, and seventh lenses have positive refractive power with specific curvature configurations, while the second and fifth lenses have negative refractive power. The eighth lens features a convex image-side surface. This localized optimization of each element's refractive power and surface geometry enables the system to achieve ultra-wide angle coverage, large aperture, and long focal length simultaneously while managing overall complexity through functional specialization of each component
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 solution effectively achieves a larger image surface and high imaging quality, reducing ghost images and distortions, while facilitating easier machining and assembly, thus addressing the challenges of miniaturization and performance requirements.
Implementation Method 1
an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with refractive power respectively
Data Source
AI summary
The disclosure provides an optical imaging lens assembly, which sequentially includes, from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens with refractive power respectively. An image-side surface of the eighth lens is a convex surface. TTL is a distance from an object-side surface of the first lens to an imaging surface of the optical imaging lens assembly on the optical axis, ImgH is a half of a diagonal length of an effective pixel region on the imaging surface of the optical imaging lens assembly, and TTL and ImgH meet TTL/ImgH<1.2. An effective focal length f8 of the eighth lens and a curvature radius R16 of the image-side surface of the eighth lens meet 0.5<f8/R16<1.5.