Zoom Lens System Aberration Correction Design
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Solution Overview
Problem
Existing zoom lens systems face challenges in achieving compactness and excellent optical performance while maintaining low cost, as they often require multiple lenses to correct aberrations, leading to increased size and complexity.
Innovation Solution
A zoom lens system comprising a negative first lens group with a meniscus-shaped lens and a positive second lens group, including an aperture stop, a biconvex lens, and a meniscus-shaped lens, coaxially disposed to optimize refracting power and correct aberrations, allowing for a compact design with fewer lenses and improved optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a two group zoom lens system employs three or more lenses in the negative lens group to correct chromatic aberration, then optical performance is improved, but device complexity and cost increase
Solution Approach 1:
The patent combines multiple lens functions into fewer elements. Specifically, the negative lens group uses only two lenses (first and second lenses) but achieves effective chromatic aberration correction by optimizing their powers and dispersions, merging the corrective functions that would traditionally require three or more lenses into this compact configuration.
Solution Approach 2:
The patent employs precise parameter optimization of the two lenses in the negative group, including their powers, dispersions, and positional relationships. By carefully selecting and adjusting these parameters, the system achieves effective aberration correction with minimal lens count, transforming the trade-off between complexity and performance.
2Reliability
If a zoom lens system employs thicker lens elements to satisfy predetermined zoom ratio and FNo., then optical performance is improved, but length of the lens system increases
Solution Approach 1:
The patent employs a collapsible zoom mechanism where the lens groups can extend and retract. During operation, the lens system extends to provide the necessary optical path length for zoom functionality and FNo. requirements. When not in use, the entire lens assembly retracts into a compact form factor, dynamically adapting between performance and compactness states.
Solution Approach 2:
The lens system is divided into separable groups (positive first lens group and negative second lens group) that can move independently. This segmentation allows the optical elements to be positioned optimally during operation for performance, while enabling complete retraction into a compact configuration when zooming is not required.
3Ease of manufacture
If the number of lenses is reduced to lower cost, then manufacturing cost is improved, but optical performance deteriorates due to insufficient aberration correction
Solution Approach 1:
The patent achieves cost-effective manufacturing by using only two lenses in the negative group, reducing material and assembly costs. Simultaneously, it maintains optical performance through precise parameter optimization of these lenses, including their powers, dispersions, and positional relationships, which effectively correct aberrations despite the reduced lens count.
Solution Approach 2:
The patent specifies different glass types for the lenses (e.g., first lens with specific dispersion, second lens with different dispersion characteristics) to achieve chromatic aberration correction. By selecting appropriate material combinations with complementary optical properties, the system achieves effective aberration correction with minimal lens count.
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 enables a compact zoom lens system that effectively corrects fundamental aberrations, reduces lens count for lower costs, and minimizes focus shift due to temperature changes, maintaining high optical performance and portability.
Implementation Method 1
a meniscus-shaped first lens 110 having a concave surface facing the image side and having negative refracting power and a second lens 120 aligned in that order from the object side to the image side. The second lens group 200 comprises an aperture stop 210, a biconvex third lens 220 with positive refracting power
Implementation Method 2
The second lens group 200 comprises an aperture stop 210, a biconvex third lens 220 with positive refracting power
Data Source
AI summary
An exemplary zoom lens system includes a negative first lens group and a positive second lens group. The first lens group includes a meniscus-shaped first lens with negative refracting power and a second lens with positive refracting power. The first lens has a concave surface facing an image side. The second lens group includes an aperture stop, a biconvex third lens with positive refracting power, and a meniscus-shaped fourth lens with negative refracting power. The fourth lens has a concave surface facing an object side. The first lens, the second lens, the aperture stop, the third lens and the fourth lens are aligned in that order from the object side to the image side.