Eight-Element Aspheric Lens Assembly for Wide-Angle Imaging
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Solution Overview
Problem
Conventional photographing optical lens assemblies struggle to balance image quality, sensitivity, aperture size, volume, and field of view, making them inadequate for modern electronic devices with diverse requirements.
Innovation Solution
A photographing optical lens assembly with eight lens elements, featuring aspheric surfaces with inflection points and critical points, and a compact design that includes plastic and glass materials, optimized for a wide field of view and reduced aberrations, using aspheric coefficients and strategic positioning of aperture stops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional lens assemblies are used, then manufacturing and assembly are simpler, but image quality and sensitivity cannot be optimized for diverse electronic device requirements
Solution Approach 1:
The lens assembly is divided into eight distinct lens elements with specific optical powers and surface characteristics. Each lens element (first through eighth) has defined object-side and image-side surfaces with specific curvature radii, thicknesses, and aspheric coefficients, allowing precise control of light paths to improve image quality while maintaining manageable complexity through systematic segmentation
Solution Approach 2:
Different lens elements have differentiated local properties: the first lens element has negative optical power with specific aspheric surfaces, the second has positive optical power, the third has negative optical power, and so on. Each surface has specific aspheric coefficients (e.g., A4, A6, A8, A10, A12, A14) tailored to correct specific aberrations in different regions of the lens, optimizing image quality locally across the entire assembly
2Use of energy by moving object
If aperture size is increased to improve sensitivity, then more light is captured, but volume and total track length increase
Solution Approach 1:
The lens assembly uses specific parameter optimizations including aspheric surface coefficients (A4, A6, A8, A10, A12, A14 for each surface), curvature radii ratios (e.g., R1/R2, R3/R4, R5/R6, R7/R8), thickness ratios (e.g., CT1/T12, CT2/T12, CT3/T12, CT4/T12, CT5/T12, CT6/T12, CT7/T12, CT8/T12), and optical power distributions across eight elements to achieve high light sensitivity with a compact total track length T12 of 4.34mm and f-number of 1.75
Solution Approach 2:
The patent employs aspheric surfaces on all lens elements with specifically designed curvature profiles. Each surface has aspheric coefficients that deviate from spherical geometry to optimize light gathering and focusing efficiency, enabling high sensitivity with reduced volume compared to conventional spherical lens designs
3Area of stationary object
If field of view is expanded to capture wider scenes, then more area is covered, but aberrations increase and image quality deteriorates
Solution Approach 1:
Each lens element has differentiated surface properties with specific aspheric coefficients tailored to control aberrations in different field regions. The object-side surfaces (111, 121, 131, 141, 151, 161, 171, 181) and image-side surfaces (112, 122, 132, 142, 152, 162, 172, 182) have distinct curvature radii and aspheric parameters optimized for their specific roles in controlling off-axis and on-axis light rays across the wide 60-degree half field of view
Solution Approach 2:
The wide field of view is managed by segmenting the optical function across eight lens elements, each with specific optical powers (positive and negative) and surface characteristics. This segmentation allows different elements to handle different portions of the wide angular field, with the first element (negative power) capturing wide angles and subsequent elements (mixed powers) correcting aberrations to maintain image quality across the entire 60-degree half field of view
4Volume of stationary object
If total track length is reduced to decrease volume, then compactness is achieved, but manufacturing precision and aberration control become more difficult
Solution Approach 1:
The compact design with total track length T12 of 4.34mm achieves aberration control through precisely optimized parameters: aspheric coefficients (A4, A6, A8, A10, A12, A14) for each of the 16 surfaces, curvature radii ratios (R1/R2, R3/R4, R5/R6, R7/R8), thickness ratios (CT1/T12, CT2/T12, CT3/T12, CT4/T12, CT5/T12, CT6/T12, CT7/T12, CT8/T12), and air gap ratios (T12/CT1, T12/CT2, T12/CT3, T12/CT4, T12/CT5, T12/CT6, T12/CT7, T12/CT8) that collectively maintain image quality in a compact form factor
Solution Approach 2:
Aspheric surfaces on all eight lens elements with specifically designed curvature profiles enable effective aberration control in the compact design. The aspheric coefficients deviate from spherical geometry to optimize light paths through the shortened total track length, maintaining image quality that would otherwise require longer focal distances in conventional spherical lens designs
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 enhances image quality, reduces volume, and expands the application range while maintaining a short total track length, improving manufacturing yield and image sensor response efficiency.
Implementation Method 1
Each of the eight lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side. At least one surface of the object-side surface and the image-side surface of at least one lens element of the photographing optical lens assembly is aspheric and includes at least one inflection point.
Implementation Method 2
a photographing optical lens assembly includes eight lens elements, the eight lens elements being, in order from an object side to an image side, 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
Data Source
AI summary
A photographing optical lens assembly includes eight lens elements, the eight lens elements being, in order from an object side to an image side, 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. Each of the eight lens elements has an object-side surface facing towards the object side and an image-side surface facing towards the image side. At least one surface of the object-side surface and the image-side surface of at least one lens element of the photographing optical lens assembly is aspheric and includes at least one inflection point.