Aspheric Imaging Lens Aberration Correction
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Solution Overview
Problem
Existing imaging lenses in compact devices face challenges in achieving a balance between low-profile design and low F-number while maintaining high optical performance, particularly in correcting aberrations at the peripheral area.
Innovation Solution
The proposed imaging lens configuration includes a specific arrangement of lenses with positive and negative refractive powers, utilizing double-sided aspheric lenses to correct aberrations such as astigmatism, field curvature, and chromatic aberration, with conditional expressions defining the optimal relationships between lens parameters to ensure proper optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional six-lens configuration is used, then the lens can achieve compact size, but it becomes very difficult to correct aberration at the peripheral area and excellent optical performance cannot be obtained
Solution Approach 1:
The patent applies local quality by making the fifth and sixth lenses double-sided aspheric lenses with specifically designed aspheric surfaces. The aspheric surfaces have different curvature radii at the center and peripheral portions, allowing different regions of the lens to have different optical properties. This enables effective correction of peripheral aberrations while maintaining the compact six-lens configuration.
Solution Approach 2:
The patent changes the geometric parameters of the lenses by introducing aspheric surfaces with specific curvature radius relationships. The conditional expressions (1) through (7) define optimal parameter ranges for the aspheric surfaces, including curvature radii at center and peripheral portions, to achieve both compact size and excellent aberration correction performance.
2Length of stationary object
If low-profileness and low F-number are pursued, then the lens becomes more compact and brighter, but aberration correction at the peripheral area deteriorates
Solution Approach 1:
The double-sided aspheric lenses (fifth and sixth lenses) have center and peripheral portions with different optical properties. The aspheric surfaces are designed with specific curvature radius relationships to locally correct peripheral aberrations while maintaining overall low-profile design and low F-number performance.
Solution Approach 2:
The patent uses aspheric surfaces instead of spherical surfaces for the fifth and sixth lenses. The aspheric surfaces have continuously varying curvature, allowing precise control of light ray paths at different field positions. This enables effective correction of peripheral aberrations in a compact, low-profile lens design with low F-number.
3Illumination intensity
If the F-number is reduced, then the lens achieves better low-light performance, but it becomes harder to maintain both low-profileness and excellent optical performance
Solution Approach 1:
The patent optimizes multiple parameters simultaneously including the aspheric surface curvature radii, lens thicknesses, and spacing between lenses. The conditional expressions define optimal parameter ranges that enable low F-number (Fno ≤ 2.0) for better low-light performance while maintaining low-profile design and excellent aberration correction across the entire field of view.
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 balanced low-profile and low F-number performance, effectively correcting aberrations and ensuring excellent optical quality across the field of view.
Implementation Method 1
a first lens having positive refractive power, a second lens having the positive refractive power, a third lens, a fourth lens, a fifth lens being a double-sided aspheric lens, and a sixth lens being a double-sided aspheric lens
Data Source
AI summary
There is provided an imaging lens with high resolution which satisfies in well balance the low-profileness and the low F-number and properly corrects aberrations.An imaging lens comprises a first lens having positive refractive power, a second lens having the positive refractive power, a third lens, a fourth lens, a fifth lens being a double-sided aspheric lens, and a sixth lens being double-sided aspheric lens and having a concave surface facing the image side near the optical axis, wherein the image-side surface of the sixth lens is an aspheric surface changing to the convex surface at a peripheral area.