Zoom Lens Design for Large Image Circle and Wide Angle
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Solution Overview
Problem
There is a demand for a zoom lens that offers a large image circle, wide angle of view, and small size with favorable optical performance, which existing technologies have not adequately addressed.
Innovation Solution
A zoom lens configuration comprising a first lens group with positive refractive power, a negative group with two or fewer lens groups, an N lens group with negative power, a P lens group with positive power, and a final lens group, where spacings between adjacent lens groups change during zooming, with specific focal length and curvature radius conditions to maintain optical performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a zoom lens is designed with a large image circle and wide angle of view, then the coverage and field of view are improved, but the lens size and complexity increase
Solution Approach 1:
The zoom lens is divided into five distinct lens groups (first lens group, negative group, N lens group, P lens group, and final lens group) with specific refractive power characteristics. This segmentation allows each group to perform specific optical functions, enabling the achievement of a large image circle and wide angle of view while controlling the overall lens size through optimized group arrangements and movements during zooming.
2Reliability
If multiple lens groups are used to achieve wide angle and large image circle, then optical performance is improved, but the number of components and device complexity increase
Solution Approach 1:
The lens groups are designed to perform multiple functions simultaneously. For example, the negative group and N lens group work together to control both the wide angle of view and the image circle, while also correcting various optical aberrations. The P lens group and final lens group contribute to both image quality and compactness. This multi-functionality reduces the need for additional dedicated components, thereby controlling device complexity while maintaining high optical performance.
3Adaptability or versatility
If all spacings between adjacent lens groups change during zooming, then zoom flexibility is improved, but the mechanical complexity and precision requirements increase
Solution Approach 1:
The zoom lens employs dynamic spacing adjustments between all adjacent lens groups during zooming operations. This dynamic configuration allows the lens to adapt its optical parameters continuously across the zoom range, achieving high zoom flexibility. The mechanical system is designed to coordinate the movements of the five lens groups, with each group's position being dynamically adjusted to maintain optimal optical performance throughout the zoom transition.
4Device complexity
If the first lens group remains stationary during zooming, then mechanical simplicity is improved, but the ability to correct aberrations throughout the zoom range may be limited
Solution Approach 1:
The negative group acts as an intermediary between the stationary first lens group and the other moving lens groups (N lens group, P lens group, and final lens group). This intermediary group, with its negative refractive power, helps to compensate for the limited movement capability of the first lens group, enabling effective aberration correction across the entire zoom range while maintaining the mechanical simplicity of having the first lens group stationary.
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 provides a zoom lens with a large image circle, wide angle of view, and small size while ensuring favorable optical performance by adhering to specific conditional expressions that stabilize lens groups and correct aberrations during zooming and focusing.
Implementation Method 1
a first lens group G1 that is disposed to be closest to an object side and has a positive refractive power, a negative group UN that is disposed to be adjacent to an image side of the first lens group G1 and has a negative refractive power as a whole
Data Source
AI summary
A zoom lens includes: a first lens group that is disposed to be closest to an object side and that has a positive refractive power; a negative group that is disposed to be adjacent to an image side of the first lens group, that consists of two or fewer lens groups, and that has a negative refractive power as a whole; an N lens group that is disposed to be closer to the image side than the negative group and that has a negative refractive power; a P lens group that is disposed to be closer to the image side than the negative group and that has a positive refractive power; and a final lens group that is disposed to be closest to the image side. During zooming, all the spacings of adjacent lens groups change. The zoom lens satisfies predetermined conditional expressions.