Six-Element Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact optical systems for portable electronic devices, such as smartphones and tablets, face challenges in achieving high image quality and resolution due to issues with lens element spacing and refractive power arrangement, leading to sensitivity and aberration problems.
Innovation Solution
A six-element optical image capturing lens assembly with specific refractive power configurations and surface shapes for each lens element, including aspheric surfaces, is designed to balance refractive power and correct aberrations, ensuring improved image quality and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a six-element lens structure is used to enhance image quality and resolution, then image quality is improved, but the axial distance between the first lens element and the second lens element becomes rather small causing assembly problems
Solution Approach 1:
The patent applies parameter changes by optimizing the curvature radii of lens surfaces (specifically R1, R2, R3, R4 relationships) and adjusting the axial distances between lens elements to achieve a balance between compact size and assembly feasibility. The specific parameter ranges defined in the patent allow for improved image quality while maintaining practical assembly characteristics.
2Measurement precision
If the refractive power of the second lens element is arranged to correct aberrations, then image quality is improved, but the sensitivity increases causing worse image quality
Solution Approach 1:
The patent applies local quality by giving different refractive power characteristics to different lens elements based on their specific positions and functions in the optical system. The second lens element is designed with specific refractive power parameters (R3, R4 relationships) that are optimized for its local role in correcting aberrations while maintaining overall system stability and reducing sensitivity.
Solution Approach 2:
The patent uses parameter changes by defining specific relationships between curvature radii (R3+R4)/(R3-R4) and other optical parameters to optimize the refractive power distribution. This allows the system to achieve better aberration correction while controlling sensitivity through mathematically defined parameter ranges.
3Volume of moving object
If a compact optical system is designed for portable devices, then device size is reduced, but the requirements for high resolution and image quality become harder to satisfy
Solution Approach 1:
The patent applies segmentation by dividing the optical system into six distinct lens elements, each with specific refractive power and surface curvature characteristics. This segmentation allows for better control of optical paths and aberration correction within a compact form factor, enabling high resolution imaging in portable devices.
Solution Approach 2:
The patent utilizes spheroidality by employing aspheric surfaces on multiple lens elements (including the sixth lens element with convex shape in off-axis region). This curvature optimization enables compact design while maintaining high image quality and resolution by controlling light paths more effectively than spherical surfaces alone.
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 corrects astigmatism and spherical aberrations, reduces sensitivity, and maintains a compact size, enabling superior image quality suitable for high-resolution applications in portable devices.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region thereof and an image-side surface being convex in a paraxial region thereof.
Implementation Method 2
an object-side surface and the image-side surface of the sixth lens element are aspheric. The image-side surface of the sixth lens element has at least one convex shape in an off-axis region thereof
Data Source
AI summary
An optical 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. The second lens element with negative refractive power has an object-side surface being concave in a paraxial region and an image-side surface being convex in a paraxial region. The third lens element has refractive power. The fourth lens element with refractive power has an object-side surface being convex in a paraxial region. The fifth lens element with positive refractive power has an image-side surface being convex in a paraxial region. The sixth lens element with refractive power has an image-side surface being concave in a paraxial region.