Five-Element Lens Assembly for Wide Field of View and Aberration Correction
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Solution Overview
Problem
Conventional imaging lens assemblies for mobile phone cameras, webcams, and security surveillance cameras face challenges in achieving a high-resolution, wide field of view with effective aberration correction while maintaining a compact design.
Innovation Solution
The proposed image capturing lens assembly consists of five lens elements with specific refractive powers and surface curvatures, including a first lens with negative refractive power, a second with positive refractive power, a third with positive refractive power, a fourth with negative refractive power, and a fifth with positive refractive power, optimized to satisfy specific focal length and curvature relations, using plastic materials for aspheric surfaces to enhance aberration correction and compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a conventional four-element lens assembly with inverse telephoto structure is used to achieve wide field of view, then the field of view is enlarged, but the aberration correction becomes ineffective
Solution Approach 1:
The lens assembly is divided into five distinct lens elements with alternating positive and negative refractive powers, allowing each element to be optimized for specific aberration corrections while collectively achieving wide field of view. The segmentation enables independent optimization of each element's curvature and material properties.
Solution Approach 2:
Different lens elements are assigned different refractive powers and surface curvatures tailored to their specific positions in the optical path. The first and fourth elements have negative refractive power with specific convex-concave surface configurations, while the second, third, and fifth elements have positive refractive power, creating localized optical corrections throughout the system.
2Manufacturing precision
If more lens elements are added to improve aberration correction, then the image resolution improves, but the total track length increases
Solution Approach 1:
The lens elements are designed with optimized spacing and curvature radii that dynamically balance the optical path length with aberration correction requirements. The specific relationships between curvature radii (R1, R2, R3, R4, R5) and focal lengths create a compact configuration that maintains high resolution without excessive length.
Solution Approach 2:
The patent specifies precise parameter relationships including focal length ratios (f1/f, f2/f, f3/f), curvature radius ratios (R1/R2, R3/R4, R5/R6), and spacing constraints (T12, T23, T34) to optimize the balance between resolution and compactness. These parameter changes enable five elements to fit in a shorter track than conventional designs.
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 provides a balanced solution for enlarging the field of view while effectively correcting aberrations, improving image resolution, and reducing the total track length, making the lens assembly more compact and efficient.
Implementation Method 1
a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with positive refractive power having a convex object-side surface; a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and a fifth lens element with positive refractive power
Data Source
AI summary
This invention provides an image capturing lens assembly in order from an object side to an image side comprising five lens elements with refractive power: a first lens element with negative refractive power having a convex object-side surface and a concave image-side surface, a second lens element with positive refractive power having a convex image-side surface, a third lens element with positive refractive power having a convex object-side surface, a fourth lens element with negative refractive power having a convex object-side surface and a concave image-side surface; and a fifth lens element with positive refractive power. By such arrangement, sufficient field of view is provided, and the aberration of the lens assembly is corrected for obtaining higher image resolution.