Six-Element Aspheric Lens Assembly for Compact Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems fail to meet the demands for high resolution and image quality due to excessive volume and inadequate light focusing ability, particularly in mobile devices with high-end specifications, and six-element lens structures do not effectively correct aberrations.
Innovation Solution
A six-element lens structure with specific refractive powers and aspheric surfaces for each lens element, including a convex object-side surface for the first lens and aspheric surfaces for all elements, with air spaces between adjacent lenses, ensuring no relative displacement, to achieve compact size and improved image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element or five-element lens structure is used, then the device complexity is low, but the image quality and resolution requirements cannot be satisfied
Solution Approach 1:
The lens system is divided into six distinct lens elements with specific refractive powers arranged in sequence. Each lens element is designed with specific characteristics (convex or concave surfaces) to perform particular optical functions, allowing the system to achieve high image quality while maintaining manageable complexity through modular segmentation.
Solution Approach 2:
Different lens elements are assigned different local properties - the first lens has positive refractive power with convex surfaces, while subsequent lenses have negative refractive power with concave surfaces. This local differentiation allows each element to optimize its function for specific aberration correction, achieving overall high image quality.
2Manufacturing precision
If a conventional six-element lens structure is used, then the image quality is enhanced, but the volume and total track length become excessive
Solution Approach 1:
The patent optimizes critical parameters including the axial distances between lens elements (TD and BL), the refractive powers of individual lenses, and the curvature of surfaces. By carefully controlling these parameters within specific ranges, the system achieves compact volume while maintaining high image quality and proper light focusing ability.
Solution Approach 2:
The lens elements are arranged in a compact configuration where the optical path folds back on itself through the use of negative refractive power lenses. This dimensional arrangement allows the system to achieve the required optical functions within a compact volume by utilizing three-dimensional spatial optimization.
3Reliability
If the first lens element has positive refractive power, then the light focusing ability is provided, but the arrangement of refractive power cannot provide adequate focusing without excessive volume
Solution Approach 1:
The first lens element with positive refractive power acts as an intermediary that provides the necessary light focusing ability. Subsequent lens elements with negative refractive power then serve as mediators to correct aberrations and control the optical path, allowing the system to achieve proper focusing within compact dimensions by distributing the optical function across multiple elements.
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 provides a compact optical system with enhanced image quality, corrected aberrations, and reduced volume, suitable for high-resolution imaging in mobile devices.
Implementation Method 1
a first lens element with positive refractive power, a second lens element with negative refractive power, a third lens element with positive refractive power, a fourth lens element with negative refractive power, a fifth lens element with positive refractive power, and a sixth lens element with negative refractive power
Data Source
AI summary
A photographing optical lens assembly includes, 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 and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. Each of the third through sixth lens elements has refractive power and an object-side surface and an image-side surface being both aspheric. The photographing optical lens assembly has a total of six lens elements with refractive power.