Five-Element Wide-Angle Lens Assembly Aberration Control
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Solution Overview
Problem
Conventional compact optical lens systems for portable electronic devices face challenges in achieving high resolution and better image quality while maintaining a compact size, as they often result in a larger size due to excessive air distances between lens elements and loose structures, which are not favorable for miniaturization.
Innovation Solution
A wide-angle image capturing lens assembly comprising five non-cemented lens elements with specific refractive powers and surface curvatures, including a first lens with negative refractive power, a second lens with concave and convex surfaces, a third lens with positive refractive power, a fourth lens with negative refractive power, and a fifth lens with positive refractive power, optimized to reduce aberrations and maintain a compact size by adjusting axial distances and thicknesses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four-element lens structure is used, then the lens assembly is compact, but the image quality and resolution are insufficient
Solution Approach 1:
The lens assembly is divided into five separate lens elements (first through fifth lens elements) with different refractive powers and surface curvatures. Each lens element is independently designed with specific optical properties (positive or negative refractive power, convex or concave surfaces) to correct different types of aberrations, thereby improving overall image quality while maintaining a compact form factor through optimized spacing relationships.
2Manufacturing precision
If an optical lens system with five-element lens structure is used to obtain better image quality and larger field of view, then the total track length becomes too long resulting in a larger size optical system
Solution Approach 1:
The patent optimizes specific parameter relationships between lens elements to achieve compact dimensions. Key parameter relationships include: Dr2r3/CT1 within a specific range, ΣCT/Td within a specific range, and Dr1r4/Dr5r10 within a specific range. These parameter optimizations allow the five-element lens system to achieve better image quality and larger field of view while controlling the total track length to maintain a compact size.
3Adaptability or versatility
If an optical lens system with five-element lens structure is used, then a larger field of view is obtained, but the excessive air distance between lens elements results in a loose structure
Solution Approach 1:
The patent establishes specific parameter relationships to control air distances between lens elements. By constraining Dr2r3/CT1 and ΣCT/Td within specific ranges, the design ensures that lens elements are positioned at optimal distances from each other. This maintains structural compactness and stability while still achieving a larger field of view through the optimized optical configuration of the five lens elements.
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 aberrations, and a compact size by optimizing the refractive powers and surface curvatures of the lens elements, allowing for a larger field of view while maintaining a compact form factor suitable for portable electronic devices.
Implementation Method 1
a first lens element 110 with negative refractive power, a second lens element 120 with refractive power, a third lens element 130 with positive refractive power, a fourth lens element 140 with negative refractive power, and a fifth lens element 150 with positive refractive power
Data Source
AI summary
A wide-angle image capturing lens assembly 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 and a fifth lens element and each of the first through fifth 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 has positive refractive power. The fourth lens element has negative refractive power, wherein at least one of an object-side surface and an image-side surface of the fourth lens element is aspheric. The fifth lens element with positive refractive power has a convex image-side surface, wherein at least one of an object-side surface and the image-side surface of the fifth lens element is aspheric.