Four-Element Wide-Angle Lens Assembly Aberration Correction
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Solution Overview
Problem
Conventional compact optical lens systems for portable electronic devices face challenges in achieving superior image quality due to decentered and tilted doublet lenses during the cementing process, limited degrees of freedom, and inadequate aberration correction, which are not suitable for modern automotive and high-image-quality applications.
Innovation Solution
A wide-angle image capturing lens assembly comprising four non-cemented lens elements with specific refractive powers and aspheric surfaces, including a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, and a fourth lens with negative refractive power, arranged to satisfy specific curvature radius and axial distance relationships, enhancing image quality and correcting aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a four-element lens structure with cemented doublet lens is used, then the lens system can be compact, but the doublet lens becomes decentered and tilted during cementing, reducing manufacturing precision
Solution Approach 1:
The patent divides the lens system into four separate lens elements instead of cementing them into doublets. This segmentation eliminates the cementing process entirely, preventing the decentering and tilting problems that occur during doublet assembly. Each lens element can be independently manufactured and positioned, significantly improving manufacturing precision while maintaining a compact overall structure.
2Volume of moving object
If a conventional four-element lens structure is used, then the device can be compact, but the degrees of freedom are limited, making it difficult to correct aberrations
Solution Approach 1:
The patent applies aspheric surfaces to specific lens elements (the third and fourth lenses) rather than using uniform spherical surfaces across all elements. This local quality enhancement provides additional degrees of freedom for aberration correction. The aspheric surfaces allow for independent optimization of different regions of the lens system, enabling superior correction of spherical aberration and other optical defects while maintaining a compact four-element structure.
3Area of moving object
If the first lens element has negative refractive power with concave image-side surface, then the field of view can be enlarged, but spherical aberration and astigmatism increase
Solution Approach 1:
The patent transitions from spherical surfaces to aspheric surfaces on the third and fourth lens elements. This curvature modification allows for precise control of light ray paths, enabling the system to maintain a wide field of view (enlarged by the first negative lens) while correcting the spherical aberration and astigmatism that would otherwise result from the wide-angle configuration. The aspheric profiles provide the additional optical power needed to counteract the aberrations introduced by the wide-angle first element.
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 provides improved image quality, reduced spherical aberration and astigmatism, and a wider field of view, making it suitable for high-image-quality applications in digital cameras, mobile devices, and tablets, while also allowing for cost-effective manufacturing using glass or plastic materials.
Implementation Method 1
a first lens element (110), a second lens element (120), a third lens element (130) and a fourth lens element (140) with refractive power
Data Source
AI summary
A wide-angle image capturing lens assembly includes four lens elements with refractive power, in order from an object side to an image side, a first lens element, a second lens element, a third lens element and a fourth lens element and each of the first through fourth lens elements is single and non-cemented. The first lens element with negative refractive power has a concave image-side surface. The second lens element with refractive power has a concave object-side surface and a convex image-side surface. The third lens element with positive refractive power has a convex image-side surface. The fourth to lens element with negative refractive power has a concave object-side surface and a convex image-side surface, wherein both of the object-side surface and the image-side surface of the fourth lens element are aspheric.