Five-Lens Optical Assembly for Compact Wide-Field Imaging
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Solution Overview
Problem
Conventional optical lens assemblies face challenges in balancing image quality, sensitivity, aperture size, volume, and field of view, making it difficult to meet the diverse requirements of modern electronic devices.
Innovation Solution
An optical image capturing lens assembly comprising five lens elements with specific refractive powers and surface shapes, including negative and positive refractive powers, convex and concave surfaces, and inflection points, optimized by specific curvature radii and axial distances to satisfy the conditions that enhance field of view and compress volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional optical lens assemblies use traditional lens configurations, then manufacturing and design are simpler, but image quality, sensitivity, aperture size, volume, and field of view cannot be balanced effectively
Solution Approach 1:
The optical lens assembly is divided into five distinct lens elements, each with specific refractive power characteristics (negative, positive, and mixed). This segmentation allows each element to be optimized for specific optical functions, enabling the balance between field of view, volume, and image quality while managing complexity through modular design
Solution Approach 2:
Each lens element is assigned specific local optical properties: the first lens element has negative refractive power for wide field of view, the second and third elements have positive refractive power for focusing, and the fourth and fifth elements have mixed surfaces for aberration correction. This local quality differentiation enables optimized performance across multiple parameters simultaneously
2Illumination intensity
If the lens assembly is designed for wide field of view, then more light can be captured, but the volume of the lens assembly increases
Solution Approach 1:
The patent employs aspheric surfaces on multiple lens elements, particularly the object-side surface of the first lens element and the image-side surface of the fifth lens element. These curved surfaces enable wide field of view and efficient light capture while maintaining a compact lens assembly volume, resolving the contradiction between illumination intensity and volume
Solution Approach 2:
The patent specifies precise parameter ranges including focal length ratios (0.2<f1/f3<0.5), curvature radius relationships (0.5<R5/R6<2.0), and axial distance proportions (0.4<T12/T23<1.6). These parameter optimizations enable the lens assembly to achieve wide field of view with compact volume by carefully controlling the optical path and element spacing
3Manufacturing precision
If more lens elements are added to improve image quality, then aberrations can be corrected better, but the device complexity and volume increase
Solution Approach 1:
The patent extracts and applies inflection points specifically on the image-side surface of the fifth lens element to correct aberrations. This targeted approach allows effective aberration correction with a limited number of lens elements, avoiding the need for additional elements that would increase device complexity while maintaining high image quality
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 achieves a balance between field of view and volume, improving image quality and reducing aberrations, while allowing for compact design suitable for electronic devices.
Implementation Method 1
The first lens element has negative refractive power. The second lens element has the object-side surface being convex in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof. The third lens element with positive refractive power has the object-side surface being convex in a paraxial region thereof and the image-side surface being convex in a paraxial region thereof.
Data Source
AI summary
An optical image capturing lens assembly includes five lens elements, the five lens elements being, in order from an object side to an image side along an optical path, a first lens element, a second lens element, a third lens element, a fourth lens element and a fifth lens element, each of the five lens elements has an object-side surface towards the object side and an image-side surface towards the image side. The first lens element has negative refractive power. The second lens element has the image-side surface being concave in a paraxial region thereof. The third lens element with positive refractive power has the image-side surface being convex in a paraxial region thereof. The fifth lens element has the object-side surface being convex in a paraxial region thereof and the image-side surface being concave in a paraxial region thereof.