Seven-Element Optical Lens Assembly for Miniaturization and Aberration Control
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Solution Overview
Problem
Conventional optical systems face challenges in achieving a balance between high image quality, low sensitivity, proper aperture size, miniaturization, and a desirable field of view due to the limitations of existing lens designs.
Innovation Solution
An optical photographing lens assembly comprising seven lens elements with specific refractive powers and surface configurations, including convex and concave surfaces with inflection points, is designed to optimize image quality and size while maintaining a wide field of view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of lens elements is increased to improve image quality, then image quality is improved, but device complexity and size increase
Solution Approach 1:
The lens assembly is divided into seven distinct lens elements with specific refractive powers and surface configurations. Each lens element is optimized for specific aberration correction functions, allowing the system to achieve high image quality through distributed functional specialization rather than a single complex element.
Solution Approach 2:
Different regions of the lens elements have different surface configurations - convex in paraxial regions, concave in off-axis regions, with inflection points strategically placed. This local variation in surface quality allows each lens element to address specific aberration types in different field regions, optimizing overall image quality.
2Use of energy by moving object
If the aperture size is increased to improve light gathering capability, then light gathering capability is improved, but sensitivity increases which is undesirable
Solution Approach 1:
The lens assembly employs specific refractive index parameters and curvature configurations for each of the seven lens elements to optimize the balance between light gathering capability and sensitivity control. The conditional expressions involving Abbe numbers and thickness ratios ensure optimal optical parameters are maintained.
3Volume of moving object
If the lens assembly is miniaturized to reduce size, then device size is reduced, but image quality deteriorates
Solution Approach 1:
The seven lens elements are arranged in a compact sequence along the optical axis with optimized spacing. The conditional expressions for thickness ratios and axial distances ensure that each lens element is positioned to maximize its optical effect while minimizing the overall assembly length, achieving miniaturization without sacrificing image quality.
Solution Approach 2:
The lens elements utilize aspheric surfaces with inflection points in off-axis regions, adding surface complexity in the radial dimension rather than increasing axial length. This allows compact miniaturization along the optical axis while maintaining image quality through sophisticated surface profiling.
4Area of stationary object
If the field of view is widened to improve coverage, then field of view is improved, but aberrations increase which deteriorates image quality
Solution Approach 1:
The lens elements feature convex surfaces in paraxial regions for wide field coverage and concave surfaces in off-axis regions with inflection points to correct aberrations. This local differentiation of surface quality across the lens aperture allows simultaneous achievement of wide field of view and high image quality across the entire field.
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 balances image quality, sensitivity, and size, enhancing the performance of optical systems by correcting aberrations and reducing the overall size of the lens assembly while maintaining a wide field of view.
Implementation Method 1
The seven lens elements are, in order from an object side to an image side along an optical path... Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side
Data Source
AI summary
An optical photographing lens assembly includes seven lens elements which are, in order from an object side to an image side along an optical path, a first lens element through a seventh lens element. Each of the seven lens elements has an object-side surface facing toward the object side and an image-side surface facing toward the image side. The object-side surface of the second lens element is convex in a paraxial region thereof. The sixth lens element has positive refractive power. The object-side surface of the seventh lens element is convex in a paraxial region thereof. At least one of the object-side surface and the image-side surface of at least one of the seven lens elements has at least one inflection point in an off-axis region thereof.