Four-Lens Optical Imaging System for Chromatic Aberration Correction
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Solution Overview
Problem
Traditional optical imaging systems using CCD or CMOS sensors lack strict correction for monotonicity and color distortion, resulting in inaccurate optical flow orientation and insufficient wide-angle capabilities.
Innovation Solution
An optical imaging system comprising four lenses with specific refractive powers, surface types, and spacings, including a first lens with a concave object-side and convex image-side surface, and a fourth lens with inflection points, designed to correct chromatic aberrations and achieve high optical flow orientation accuracy while maintaining miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional optical imaging system is used, then the system structure is simple, but the optical flow orientation accuracy is insufficient due to lack of strict correction for monotonicity and color distortion
Solution Approach 1:
The optical imaging system is divided into four separate lens elements with different refractive powers and Abbe numbers. Each lens element is optimized for specific functions: the first lens (positive power, low Abbe number) corrects chromatic aberration, the second lens (positive power, high Abbe number) provides additional focusing, the third lens (negative power) corrects distortion, and the fourth lens (positive power) fine-tunes the image. This segmentation allows strict correction of monotonicity and color distortion while maintaining a manageable system structure.
Solution Approach 2:
Each lens element is assigned specific local optical properties: the first lens uses material with low Abbe number (V1<55) for strong chromatic aberration correction, the second lens uses material with high Abbe number (V2>55) for complementary correction, the third lens uses negative refractive power for distortion correction, and the fourth lens provides final image optimization. This local quality differentiation enables precise control over color distortion and monotonicity across the image field.
2Adaptability or versatility
If the field-of-view angle is increased to achieve wide-angle capability, then the spatial range is expanded, but the image quality and optical flow orientation accuracy deteriorate
Solution Approach 1:
The third lens element with negative refractive power is specifically designed to correct distortion across the wide field-of-view. The aspheric surfaces of all lens elements are optimized to maintain image quality from the center to the edges of the wide-angle field. The specific arrangement and optical parameters of the four lenses work together to control ray angles and correct off-axis aberrations, enabling wide-angle operation (field-of-view angle ≥60°) while maintaining high optical flow orientation accuracy.
Solution Approach 2:
The optical system is designed with flexible spacing between lens elements that can be optimized for different field-of-view requirements. The aspheric surface parameters and lens separations are configured to dynamically adapt to wide-angle imaging conditions, maintaining correction effectiveness across the expanded spatial range.
3Volume of moving object
If the photosensitive element size is reduced for miniaturization, then the device size is decreased, but the image quality and optical performance deteriorate
Solution Approach 1:
The use of four compact lens elements with optimized individual parameters allows the total system length to be minimized while maintaining correction effectiveness. Each lens element is designed with specific thickness and curvature parameters that enable miniaturization without sacrificing image quality. The segmented design allows precise control of optical paths within a compact form factor.
Solution Approach 2:
The optical parameters of each lens element (refractive power, Abbe number, surface curvatures, thickness) are precisely optimized to maintain image quality in a miniaturized configuration. The ratio constraints between lens parameters and the overall system focal length are carefully controlled to ensure that reducing device size does not compromise the strict correction of color distortion and monotonicity required for high-quality imaging.
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 system achieves excellent image quality, large field-of-view angle, and high optical flow orientation accuracy, effectively addressing the limitations of traditional systems.
Implementation Method 1
a first lens, a second lens, a third lens and a fourth lens... the first lens has a positive refractive power or a negative refractive power... both the second lens and the third lens may have positive refractive powers... the fourth lens has a positive refractive power or a negative refractive power
Data Source
AI summary
The present disclosure discloses an optical imaging system, the optical imaging system including sequentially, along an optical axis from an object side to an image side, a first lens, a second lens, a third lens and a fourth lens. The first lens has a positive refractive power or a negative refractive power, an object-side surface of the first lens is a concave surface, and an image-side surface of the first lens is a convex surface; both the second lens and the third lens have positive refractive powers; and the fourth lens has a positive refractive power or a negative refractive power, wherein an abbe number V1 of the first lens and an abbe number V4 of the fourth lens satisfy: |V1−V4|≤30; and the abbe number V1 of the first lens and an abbe number V2 of the second lens satisfy: 20≤|V1−V2|≤50.