Six-Element Lens Assembly for Compact High-Aperture Imaging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
There is a need for a compact image capturing lens assembly with high image quality and large aperture that can be integrated into miniaturized electronic devices, while maintaining a compact size and efficient illumination.
Innovation Solution
The image capturing lens assembly consists of six lens elements, including a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with negative refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power, where specific refractive indices, curvature radii, and refractive powers are optimized to achieve compactness and high image quality, with the sixth lens having a negative refractive index between 1.60 and 1.77 and a curvature radius ratio within specific limits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens assembly is miniaturized to reduce size, then compactness is improved, but image quality and illumination efficiency deteriorate
Solution Approach 1:
The patent applies parameter changes by optimizing the refractive index distribution across lens elements (N1=1.56, N2=1.64, N3=1.56, N4=1.64, N5=1.56, N6=1.64) and controlling specific curvature radius ratios (0.5<R11/R12<2.0, 0.3<R21/R22<1.5, etc.) to maintain high image quality in a miniaturized form factor with total track length TTL controlled within specific ranges
Solution Approach 2:
The patent uses composite optical design by combining multiple lens elements with alternating refractive indices (1.56 and 1.64) and different optical powers (positive and negative), creating a composite lens system that achieves both compactness and high imaging performance through the synergistic effect of diverse optical materials
2Illumination intensity
If the aperture is enlarged to improve illumination, then light gathering ability is improved, but lens complexity and size increase
Solution Approach 1:
The patent controls the f-number within specific ranges (1.4<Fno<2.0) by adjusting aperture diameter relative to focal length, achieving high illumination efficiency without excessive size increase. The refractive index parameters and curvature ratios are optimized to maintain image quality at these aperture levels
Solution Approach 2:
The lens assembly achieves multi-functionality by simultaneously providing high illumination efficiency (f/1.4-f/2.0), compact form factor (controlled TTL), and high image quality (corrected aberrations), making it suitable for various electronic devices without requiring separate designs for different performance requirements
3Manufacturing precision
If the number of lens elements is increased to improve image quality, then imaging performance is improved, but assembly size and complexity increase
Solution Approach 1:
The patent uses six lens elements with precisely controlled refractive indices (alternating 1.56 and 1.64) and curvature radius ratios within specific ranges to correct aberrations effectively. This parameter optimization allows high image quality with only six elements, avoiding the need for more elements that would increase size
Solution Approach 2:
The patent applies local quality by assigning different refractive indices and optical powers to specific lens elements based on their positions in the optical path. Each element is optimized for its local function (e.g., positive power for convergence, negative power for divergence, specific refractive indices for dispersion control), achieving overall high image quality through localized optimization
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
This configuration allows for a compact lens assembly with improved image quality, reduced aberrations, and increased flexibility in design, enabling efficient illumination and a wider field of view, suitable for various electronic devices such as mobile devices and digital cameras.
Implementation Method 1
The first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element with positive refractive power, the fourth lens element with negative refractive power, the fifth lens element with positive refractive power, and the sixth lens element with negative refractive power
Data Source
AI summary
An image capturing 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 fifth lens element has an object-side surface being convex in a paraxial region thereof. The sixth lens element with negative refractive power has an image-side surface being concave in a paraxial region thereof and includes at least one convex shape in an off-axial region thereof.