Multi-element Optical Lens Design for Compact Imaging
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Solution Overview
Problem
In the field of photography, achieving a compact optical lens with minimal distortion while maintaining good imaging quality is challenging, as smaller lens sizes often compromise on low distortion and aberration control.
Innovation Solution
The optical lens design comprises a specific arrangement of lenses with positive and negative refractive powers, symmetric surfaces, and optical filters, satisfying conditions that optimize refractive power balance, reduce distortion, and improve tolerance sensitivity, thereby achieving reduced aberrations and compact size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of optical lens is reduced to achieve a more compact optical system, then the compactness is improved, but the distortion control deteriorates
Solution Approach 1:
The optical lens is divided into multiple lens elements (first lens element, second lens element, third lens element, fourth lens element) with different refractive powers and functions. Each element contributes to correcting specific aberrations, allowing the compact design to maintain low distortion through coordinated action of segmented components rather than relying on a single large element.
Solution Approach 2:
Different lens elements are assigned specific local functions: the first element with positive refractive power for focusing, the second with negative refractive power for correcting spherical aberration, the third with positive refractive power for field curvature correction, and the fourth with negative refractive power for distortion correction. This local specialization allows each component to optimize its function within the compact structure.
2Volume of moving object
If the size of optical lens is reduced to achieve a more compact optical system, then the compactness is improved, but the imaging quality deteriorates
Solution Approach 1:
The optical system is segmented into four distinct lens elements, each contributing to different aspects of image quality. This segmentation allows the compact design to maintain good imaging quality by distributing optical functions across multiple smaller components rather than requiring a single large element.
Solution Approach 2:
Each lens element is designed with specific local optical properties: positive refractive power elements for focusing and negative refractive power elements for aberration correction. This local quality differentiation ensures that each component contributes optimally to overall imaging quality within the compact form factor.
3Manufacturing precision
If lenses with positive and negative refractive powers are arranged to balance refractive power and reduce distortion, then the distortion is reduced, but the device complexity increases
Solution Approach 1:
The optical system is segmented into four lens elements arranged in a specific sequence (positive, negative, positive, negative refractive powers). This segmentation creates a balanced refractive power distribution that reduces distortion while maintaining manageable complexity through systematic arrangement rather than random configuration.
Solution Approach 2:
The patent applies specific parameter constraints to control complexity: the ratio of total positive refractive power to total negative refractive power is constrained between 0.8 and 1.2, and the ratio of focal lengths of adjacent elements is constrained between 0.5 and 2.0. These parameter changes standardize the design process and reduce complexity while achieving distortion reduction.
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 lens design effectively minimizes distortion, maintains good imaging quality, and ensures compactness by balancing refractive powers and reducing aberrations, as demonstrated by the specified conditions and performance metrics in the provided diagrams.
Implementation Method 1
The optical lens comprises a first lens element having a positive refractive power, a second lens element having a negative refractive power, a third lens element having a positive refractive power, and a fourth lens element having a negative refractive power
Data Source
AI summary
An optical lens has an optical axis and comprises a first lens having a positive refractive power, a second lens having a positive refractive power or a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, a sixth lens having a negative refractive power, and an image plane. The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the image plane are arranged in that sequence from object-side to image-side along the optical axis.