Plastic Aspherical Zoom Lens Aberration Correction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Traditional zoom lens systems fail to adequately modify spherical aberration to meet current standards, especially with increasing pixel density and smaller pixel sizes in digital cameras, leading to suboptimal image quality.
Innovation Solution
A lightweight zoom lens system comprising at least two plastic lenses, with specific optical power arrangements and curvature criteria, including aspherical lenses, to reduce weight and correct various optical aberrations, ensuring better image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional glass lenses are used in zoom lens systems, then optical aberration correction is adequate, but the system weight increases and cost increases
Solution Approach 1:
The patent changes the material parameter from traditional glass to plastic for lens elements L3 and L6, achieving weight reduction while maintaining optical performance through careful selection of plastic materials with appropriate refractive indices and Abbe numbers that satisfy the specified optical constraints
Solution Approach 2:
The patent employs composite lens designs where plastic lenses are combined with aspherical surfaces and specific curvature relationships (|R1/R2| constraints) to create a hybrid optical system that leverages both material advantages and geometric optimization to correct aberrations previously only achievable with glass
2Reliability
If plastic lenses are used to reduce weight, then manufacturing cost decreases and weight reduces, but spherical aberration correction becomes insufficient
Solution Approach 1:
The patent introduces aspherical surfaces on plastic lens elements, specifically making the second surface of lens L3 and the first surface of lens L6 aspherical, which provides additional degrees of freedom for correcting spherical aberration and other optical aberrations that cannot be corrected by spherical surfaces alone
Solution Approach 2:
The patent carefully selects and constrains optical parameters including curvature radii ratios (|R1/R2|), focal length relationships (fL3×fL6), and material properties (refractive index nd and Abbe number vd) to achieve optimal aberration correction with plastic materials
3Reliability
If lens curvature is increased to correct distortion, then distortion aberration improves, but wide-angle range is reduced
Solution Approach 1:
The patent uses aspherical surfaces to correct distortion aberration without requiring extreme curvature changes that would limit the wide-angle range, allowing the lens to maintain both good distortion correction and wide angular coverage
Solution Approach 2:
The patent optimizes the curvature radius ratio parameter |R1/R2| within specific bounds to balance distortion correction with wide-angle performance, preventing both excessive concavity that worsens distortion and insufficient curvature that reduces wide-angle capability
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 image quality by effectively reducing spherical aberration, distortion, and chromatic aberration, while maintaining a lightweight and cost-effective design, suitable for high-resolution digital cameras.
Implementation Method 1
the second negative lens is an aspherical plastic lens and is adjacent to the second lens group
Implementation Method 2
utilizes at least two plastic lenses capable of reducing the weight of the zoom lens system
Implementation Method 3
a first lens group with a negative optical power, a second lens group with a positive optical power, and a third lens group with a positive optical power
Data Source
AI summary
A zoom lens system is disclosed which includes a first lens group with negative optical power, a second lens group with positive optical power, and a third lens group with positive optical power, arranged in that order from an object side to an image side. The zoom lens system performs zooming by changing distances between the lens groups. The first lens group includes at least two negative lenses, and one of the negative lenses is adjacent to the second lens group and satisfies the following criteria0.08<R1R2<0.52,where R1 is the curvature radius of the first surface facing toward the object side, and R2 is the curvature radius of the second surface facing toward the image side.