Six-element Optical Lens Design for Aberration Correction
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Solution Overview
Problem
In the field of photography, there is a need for compact optical systems with reduced optical aberration and improved tolerance endurance, particularly as image sensors with smaller pixel sizes require more precise optical design to maintain image quality.
Innovation Solution
The optical lens design incorporates a symmetrical arrangement of lens elements with specific aspheric surfaces and refractive indices, adhering to specific parameters and formulas to minimize color aberration and maintain image quality, including the use of an optical filter to filter infrared light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the size of image sensor is reduced to make the optical system more compact, then the length of optical system is reduced, but the color aberration becomes more significant
Solution Approach 1:
The optical lens is divided into multiple lens elements (at least six lens elements) with different optical powers and materials. This segmentation allows each element to contribute to correcting specific types of aberrations, particularly color aberration, while maintaining a compact overall system length suitable for small pixel size sensors.
Solution Approach 2:
The patent employs lens elements made of different glass materials with specific refractive indices and Abbe numbers (e.g., positive lens elements with higher refractive indices and negative lens elements with lower refractive indices). This composite material approach enables effective correction of color aberration by compensating for chromatic dispersion across different wavelengths.
2Length of moving object
If the pixel size is reduced to maintain resolution in a compact system, then the optical system length is reduced, but the optical aberration correction becomes more difficult
Solution Approach 1:
The optical system is segmented into multiple specialized lens elements, each designed to address specific aberration types. This segmentation makes the complex task of aberration correction more manageable by distributing the correction function across multiple elements rather than requiring extreme precision from fewer elements.
Solution Approach 2:
The patent incorporates aspheric surfaces on certain lens elements to correct spherical aberration and other monochromatic aberrations. The aspheric profiles provide additional degrees of freedom for optimizing image quality without requiring increased system length, thereby maintaining compactness while achieving precise aberration correction.
3Object-generated harmful factors
If more lens elements are added to reduce color aberration, then the color aberration is reduced, but the device complexity increases
Solution Approach 1:
The optical lens is segmented into at least six lens elements arranged in a specific configuration from object side to image side. This segmentation into manageable units with defined optical powers and material properties enables effective color aberration correction while keeping the overall design systematic and manufacturable.
Solution Approach 2:
The patent optimizes specific parameters of each lens element (refractive index, Abbe number, focal length, thickness) to achieve effective aberration correction. By carefully controlling these parameters within specified ranges, the system achieves high performance without excessive complexity, balancing correction capability with design simplicity.
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 reduces longitudinal spherical aberration, lateral color aberration, field curvature, and distortion, ensuring high image quality for small-pixel-size sensors while maintaining a compact optical system.
Implementation Method 1
an optical filter to filter infrared light
Implementation Method 2
The optical lens design incorporates a symmetrical arrangement of lens elements with specific aspheric surfaces and refractive indices
Data Source
AI summary
An optical lens of the present disclosure 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, a sixth lens element, an optical filter and a sensor. The optical lens also has an axis. The first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are symmetrical about the axis.