Thin Optical Lens Assembly Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional compact optical lens assemblies for electronic devices face challenges in reducing total length while maintaining image quality and correcting aberrations, as they often compromise on focal length and aberration adjustment.
Innovation Solution
A thin optical lens assembly comprising a bi-convex first lens element with positive refractive power and a second lens element with negative refractive power, both with aspheric surfaces, arranged along an optical axis, which satisfies specific equations to optimize refractive power distribution and surface curvature, reducing the total length and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a combination of positive-negative or negative-positive refractive power arrangements is adopted to reduce the length of the lens, then the total length of the lens is reduced effectively, but it is difficult to adjust the focus and correct or reduce the pronounced aberrations or image distortions
Solution Approach 1:
The patent changes the refractive power parameters by using a first lens with positive refractive power and a second lens with negative refractive power, where the negative lens has specific curvature radius relationships (R3 and R4) that optimize both compact length and aberration correction. This parameter optimization allows the system to achieve short focal length while maintaining good optical performance.
Solution Approach 2:
The patent employs a composite lens system combining two different lens elements with complementary refractive properties. The first lens (positive power) and second lens (negative power) work together as a composite optical system, where the combination of their refractive indices and curvatures achieves both compactness and aberration correction that neither lens could achieve alone.
2Length of moving object
If the focal length is shortened to meet compact design requirements, then the total length of the optical system is reduced, but the aberration adjustment and image quality deteriorate
Solution Approach 1:
The patent optimizes the curvature radii parameters of the second lens (R3 and R4) to satisfy specific relationships that correct aberrations while maintaining a short focal length. By carefully selecting these geometric parameters, the system achieves compact design without sacrificing optical quality.
Solution Approach 2:
The patent utilizes aspheric surfaces with specific curvature characteristics to correct optical aberrations. The second lens has a concave object-side surface and convex image-side surface with optimized curvatures that reduce spherical aberration and improve image quality while maintaining compact focal length.
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 effectively shortens the optical system's length, enhances field angle, and improves resolution by correcting aberrations, including chromatic and spherical aberrations, while maintaining high image quality and reducing manufacturing complexity.
Implementation Method 1
a first lens element with a positive refractive power, and its object-side surface and image-side surface are aspheric
Implementation Method 2
the second lens element with a negative refractive power has a concave object-side surface and a convex image-side surface, both the object-side surface and the image-side surface of the second lens element are aspheric
Data Source
AI summary
This invention discloses a thin optical lens assembly, comprising two lens elements with refractive power arranged from an object side to an image side along an optical axis, a bi-convex first lens element with a positive refractive power, a second lens element with a negative refractive power having a concave object-side surface and a convex image-side surface, and an image sensor on an image plane. Each of the two lens elements has two aspheric optical surfaces, and preferably is made of plastic. Additionally, the thin optical lens assembly satisfies the conditions of the present invention in order to reduce the total length and the sensitivity for its use in compact cameras and mobile phones with photographing functions.