Six-Element Optical Lens System Aberration Correction
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Solution Overview
Problem
Conventional compact optical lens systems, typically with four or five-element structures, fail to meet the increasing demands for higher image quality and megapixels in portable electronic devices, particularly in resolving power and peripheral field of view.
Innovation Solution
An image capturing optical lens system comprising six elements, with specific refractive powers and aspheric surfaces, including a first lens with positive power, a second with negative power, a third with refractive power, a fourth with positive power, a fifth with negative power, and a sixth with changing surface curvature, optimized to correct aberrations and maintain a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a four-element or five-element lens structure is used, then the device complexity is reduced, but the image quality and resolving power deteriorate
Solution Approach 1:
Each lens element is designed with multiple functions: the first lens element (positive power) both converges light and begins correcting spherical aberration; the second lens element (negative power) diverges light while correcting chromatic aberration; the third lens element refines focus and reduces astigmatism; the fourth lens element (aspheric) provides final focus adjustment and corrects remaining spherical aberration. This multi-functional design allows six elements to achieve superior image quality without proportionally increasing system complexity
Solution Approach 2:
The patent employs aspheric surfaces on the fourth lens element with specifically optimized curvature parameters. The aspheric coefficient and curvature radius are precisely controlled to correct spherical aberration that cannot be addressed by conventional spherical surfaces. Additionally, the refractive indices and Abbe numbers of different lens materials are carefully selected and varied to optimize chromatic aberration correction while maintaining compact dimensions
2Manufacturing precision
If a six-element lens structure is used, then the image quality improves, but the device complexity increases
Solution Approach 1:
The optical system is segmented into six distinct lens elements with clearly defined functional zones. The first three elements handle primary light convergence and initial aberration correction, while the fourth element (aspheric) addresses residual spherical aberration, and the fifth and sixth elements refine focus and correct peripheral field distortions. This segmentation allows each element to be optimized for its specific function, achieving high image quality without requiring all elements to be equally complex
Solution Approach 2:
The fourth lens element incorporates an aspheric surface with a specifically designed curvature profile that transitions from spherical near the optical axis to more pronounced asphericity at the periphery. This controlled deviation from spherical geometry enables effective correction of spherical aberration while maintaining manufacturability through standard aspheric molding techniques, thus improving image quality without excessive complexity increase
3Shape
If the fifth lens element has a meniscus with stronger curvature, then the peripheral field of view can be focused on the image plane, but the resolving power and image quality deteriorate
Solution Approach 1:
The fifth lens element is designed with differential surface properties: the object-side surface has a specific curvature to address peripheral field focus, while the image-side surface is optimized for resolving power. The aspheric coefficients are locally varied across the surface - stronger curvature correction at the periphery for field focus, and more gradual curvature near the axis for maintaining resolving power. This local optimization allows simultaneous achievement of both peripheral focus and high resolving power
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 improved image quality by correcting spherical aberration, astigmatism, and chromatic aberration, while maintaining a compact size, suitable for high-megapixel applications in portable electronics.
Implementation Method 1
The first lens element with positive refractive power has an object-side surface being convex at a paraxial region thereof. The second lens element has negative refractive power. The third lens element has refractive power. The fourth lens element has refractive power
Data Source
AI summary
An image capturing optical lens system 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, and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second lens element has refractive power. The third lens element with refractive power has a concave image-side surface. The fourth lens element has refractive power, and at least one surface thereof is aspheric. The fifth lens element with negative refractive power has a concave object-side surface and a convex image-side surface, and the surfaces thereof are aspheric. The sixth lens element with refractive power has a convex object-side surface, and an image-side surface changing from concave at a paraxial region thereof to convex at a peripheral region thereof, and the surfaces are aspheric.