Six-Lens Optical System Correcting Aberrations via Refractive Power Distribution
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Solution Overview
Problem
Conventional optical systems for portable electronic devices, such as smartphones and tablets, fail to meet the demands for high megapixels and improved image quality due to excessive aberrations and inadequate correction of astigmatism and off-axis aberrations, leading to suboptimal image quality.
Innovation Solution
A miniaturized optical image collecting system comprising six lens elements with specific refractive powers and surface configurations, including aspheric surfaces, is designed to reduce aberrations and improve image quality by optimizing the distribution of refractive power and correcting chromatic and astigmatic aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the refractive power of the fifth lens element is increased to improve resolving power, then the resolving power is improved, but excessive aberrations are generated which are not favorable for correction
Solution Approach 1:
The patent applies parameter changes by carefully controlling the refractive power of the fifth lens element within a specific range (0.3 < f5/f < 1.5) and adjusting the ratio of focal lengths of the fourth and fifth lens elements (0.3 < f4/f5 < 1.5). This optimization balances the resolving power improvement while preventing excessive aberration generation that would occur with higher refractive powers.
2Device complexity
If the optical system lacks a meniscus lens element with concave object-side surface, then the structure is simpler, but astigmatism and off-axis aberration cannot be corrected effectively
Solution Approach 1:
The patent applies local quality by introducing a meniscus lens element (fifth lens element) with specific surface curvature characteristics (concave object-side surface, convex image-side surface) at a specific position in the optical system. This localized structural modification targets the correction of astigmatism and off-axis aberration without requiring complete redesign of the entire optical system.
3Device complexity
If the angle of incidence onto the image sensor from the off-axis field is not reduced, then the optical path is simpler, but the responding efficiency of the image sensor is reduced which influences image quality
Solution Approach 1:
The patent applies dimensionality change by utilizing the meniscus lens element's dual-curved surface configuration (concave object-side, convex image-side) to alter the spatial distribution of light rays. This structural approach reduces the angle of incidence of off-axis light onto the image sensor by changing the ray paths in multiple dimensions, thereby improving sensor responding efficiency without significantly complicating the overall optical path.
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 system achieves improved resolving power, reduced aberrations, and enhanced image quality by effectively distributing refractive power and correcting aberrations, resulting in a compact and efficient optical design suitable for high-end camera functionalities in portable devices.
Implementation Method 1
The fifth lens element with refractive power has a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric. The sixth lens element with refractive power has a concave image-side surface at a paraxial region, wherein the image-side surface of the sixth lens element changes from concave at the paraxial region to convex at a peripheral region, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric.
Implementation Method 2
When an Abbe number of the first lens element is V1, and an Abbe number of the fifth lens element is V5, the following relationship is satisfied: 0.3<V5/V1<1.0. The said optical image collecting system has a total of six lens elements with refractive power.
Data Source
AI summary
An optical image collecting system 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, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has a convex object-side surface. The second through sixth lens elements all have refractive power. The fifth lens element has a concave object-side surface and a convex image-side surface, wherein at least one of the object-side surface and the image-side surface of the fifth lens element is aspheric. The sixth lens element has a concave image-side surface at a paraxial region, wherein the image-side surface of the sixth lens element changes from concave at the paraxial region to convex at a peripheral region, and both of an object-side surface and the image-side surface of the sixth lens element are aspheric.