Five-Element Aspheric Lens Assembly for Mobile Device Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact photographing lenses used in mobile electronic devices fail to meet the demand for high-resolution and high-quality images, particularly with the increasing performance and miniaturization requirements of smartphones and PDAs, as they are unable to effectively correct aberrations and maintain image quality in limited spaces.
Innovation Solution
A photographing optical lens assembly comprising five lens elements with specific refractive powers and surface curvatures, including aspheric surfaces, arranged to satisfy certain conditions that optimize focal lengths, curvature ratios, and Abbe numbers, which correct chromatic and spherical aberrations, and miniaturize the lens while maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional four lens assembly is used, then the device structure is simple, but the image quality and resolution are insufficient for high-performance mobile devices
Solution Approach 1:
The patent divides the optical system into five distinct lens elements with specific refractive powers and surface curvatures. Each lens element is designed with particular characteristics (positive or negative refractive power, concave or convex surfaces) to correct specific aberrations. This segmentation allows systematic correction of optical aberrations while maintaining a compact overall structure suitable for mobile devices.
2Length of stationary object
If the lens assembly is miniaturized to fit mobile devices, then the device size is reduced, but the ability to correct aberrations and maintain image quality deteriorates
Solution Approach 1:
The patent applies local quality by giving each lens element specific local characteristics tailored to its position and function in the optical system. For example, the first lens element has positive refractive power with specific surface curvatures, while the second has negative refractive power. Each element's surfaces (object-side and image-side) are designed with particular curvature radii to correct specific aberrations locally, allowing effective aberration correction in a miniaturized configuration.
Solution Approach 2:
The patent utilizes parameter changes by optimizing specific optical parameters including curvature radii (R1, R2, R3, R4, etc.), axial distances (T1, T2, T3, T4), refractive indices, and Abbe numbers. The design satisfies specific mathematical relationships between these parameters (e.g., 0.3 < (R3+R4)/(R3-R4) × f2/f < 0.7) to achieve both miniaturization and aberration correction. The aspheric surfaces further enable parameter optimization by allowing more flexible control of light paths.
3Manufacturing precision
If multiple lens elements are added to improve image quality, then the aberration correction is enhanced, but the overall optical length and device size increase
Solution Approach 1:
The patent employs spheroidality by incorporating aspheric surfaces on the object-side and/or image-side of at least one lens element. The aspheric surfaces are defined by specific mathematical equations with coefficients (A4, A6, A8, A10, A12) that control the surface curvature variation. This allows more efficient control of light rays, enabling better aberration correction with reduced optical length compared to traditional spherical surfaces. The aspheric design enables compact configuration while maintaining high image quality.
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 lens assembly effectively corrects various aberrations, reduces the overall optical length, and enhances image quality across different wavelengths, achieving improved performance and miniaturization suitable for high-performance mobile devices.
Implementation Method 1
a third lens element with positive refractive power having a concave object-side surface and a convex image-side surface, a fourth lens element with negative refractive power having a concave object-side surface and a convex image-side surface
Data Source
AI summary
An photographing optical lens assembly includes, in order from an object side to an image side, a first lens element with positive refractive power, a second lens element with negative refractive power having a concave object-side surface and a concave image-side surface, a plastic third lens element with positive refractive power having a concave aspheric object-side surface and a convex aspheric image-side surface, a plastic fourth lens element with negative refractive power having a concave aspheric object-side surface and a convex aspheric image-side surface and a plastic fifth lens element having an aspheric object-side surface and an aspheric image-side surface. By adjusting the focal lengths of the second and the fourth lens element and the photographing optical lens assembly, and the curvature radii of the object-side and the image-side surface of the second lens element, the photographing optical lens assembly is miniaturized, and the image quality is improved.