Imaging Lens Aspheric Off-Axial Pole Aberration Correction
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Solution Overview
Problem
Conventional imaging lenses face difficulties in achieving a wide field of view, low-profileness, and low F-number while effectively correcting aberrations, particularly in the peripheral area.
Innovation Solution
The imaging lens configuration includes a first lens with positive refractive power and a convex surface, followed by lenses with negative and positive refractive powers, and aspheric surfaces with off-axial pole points to correct various aberrations, ensuring a balanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional lens configurations are used to achieve wide field of view and low F-number, then the lens can capture more light and broader scenes, but aberrations in the peripheral area cannot be effectively corrected
Solution Approach 1:
The lens is divided into six distinct lens elements, each with specific refractive power and surface curvature characteristics. This segmentation allows each element to contribute to correcting specific types of aberrations while collectively achieving wide field of view and low F-number performance.
Solution Approach 2:
Different lens elements are designed with locally optimized properties - the first lens has a convex object-side surface for wide field of view, the second lens has negative refractive power for correcting spherical and chromatic aberrations, and subsequent lenses have specific curvature configurations to correct coma, astigmatism, and distortion in different regions of the optical field.
2Measurement precision
If the lens is designed for wide field of view and low F-number, then the lens can achieve better imaging performance, but the lens profile becomes larger and more complex
Solution Approach 1:
The lens elements utilize aspheric surfaces with off-axial pole points instead of simple spherical surfaces. This curvature design allows for more efficient light path control, achieving wide field of view and high resolution while maintaining a more compact lens profile compared to conventional spherical lens designs.
Solution Approach 2:
The patent employs specific parameter relationships between lens elements - the refractive powers, focal lengths, and spacing between the six lens elements are optimized to achieve the desired imaging performance. The aspheric surface parameters are specifically configured to correct aberrations while controlling the overall lens length.
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 achieves high-resolution imaging with a wide field of view and low-profileness while effectively correcting spherical aberration, chromatic aberration, and distortion, maintaining excellent optical performance.
Implementation Method 1
the image-side surface of the sixth lens is formed as an aspheric surface having at least one off-axial pole point
Implementation Method 2
a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power near the optical axis
Data Source
AI summary
There is provided an imaging lens with high-resolution which satisfies demand of the wide field of view, the low-profileness and the low F-number, and excellently corrects aberrations. An imaging lens comprises in order from an object side to an image side, a first lens having positive refractive power and a convex surface facing the object side near an optical axis, a second lens having negative refractive power near the optical axis, a third lens, a fourth lens, a fifth lens having a concave surface facing the image side near the optical axis, and a sixth lens having a concave surface facing the image side near the optical axis, wherein an image-side surface of the sixth lens is formed as an aspheric surface having at least one off-axial pole point, the fifth lens has positive refractive power near the optical axis, an object-side surface of the sixth lens has a convex surface facing the object side near the optical axis, and predetermined conditional expressions are satisfied.