Zoom Lens Segmentation for High-Ratio Chromatic Aberration Control
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Solution Overview
Problem
Existing zoom lenses for image pickup apparatuses face challenges in achieving a compact and lightweight design with high optical performance, high zoom ratio, and minimal chromatic aberration, particularly when incorporating large aperture diameters and high pixel densities in image sensors.
Innovation Solution
A zoom lens configuration with specific refractive power arrangements and glass material selection for lens units, including a first fixed lens unit, a moving second lens unit, and at least two moving lens units, with focal length and Abbe number constraints to minimize chromatic aberration and lens size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a zoom lens is designed with large aperture diameter and high zoom ratio, then the lens can capture more light and provide higher magnification, but chromatic aberration increases and optical performance deteriorates
Solution Approach 1:
The lens is divided into multiple lens units with specific refractive powers arranged in sequence. The first lens unit has positive refractive power, the second has negative refractive power, and the third has positive refractive power. This segmentation allows each unit to contribute to correcting different types of aberrations while achieving high zoom ratio and large aperture diameter.
Solution Approach 2:
The patent specifies precise parameter ranges for the refractive powers of each lens unit and the distances between them. By optimizing these parameters, the lens achieves high zoom ratio and large aperture while minimizing chromatic aberration. The specific refractive power values and spacing are tuned to balance magnification capability with optical performance.
2Weight of moving object
If the lens structure is made compact and lightweight, then the image pickup apparatus becomes smaller, but it becomes difficult to achieve high optical performance
Solution Approach 1:
Multiple lens units with different refractive powers are combined in a compact arrangement. The first, second, and third lens units are positioned close to each other with optimized spacing, allowing the lens to achieve high optical performance in a compact form factor. This merging of functional elements reduces overall lens size and weight while maintaining performance.
3Measurement precision
If the number of pixels in the image sensor is increased, then the resolution and detail capture improve, but the requirement for lens resolving power from central to peripheral portion increases
Solution Approach 1:
The lens design addresses different quality requirements at different locations (central vs. peripheral regions). By optimizing the refractive power distribution across the three lens units and their spacing, the lens achieves uniform resolving power from the central to peripheral portions of the image sensor, accommodating high pixel density sensors.
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 compact, lightweight zoom lens with high optical performance across the entire zoom range, effectively managing chromatic aberrations and maintaining image quality.
Implementation Method 1
a first lens unit that has a positive refractive power, a second lens unit that has a negative refractive power, at least two lens units that move in zooming, and a final lens unit that has a positive refractive power
Data Source
AI summary
A zoom lens includes, in order from an object side to an image side, a first lens unit that has a positive refractive power and does not move for zooming, a second lens unit that has a negative refractive power and moves in zooming, at least two lens units that move in zooming, and a final lens unit that has a positive refractive power, is disposed closest to the image side, and does not move for zooming. The first lens unit includes, in order from the object side to the image side, a first sub-lens unit that has a negative refractive power and does not move for focusing, a second sub-lens unit that has a negative refractive power and moves for focusing, and a third sub-lens unit having a positive refractive power. A distance between the second sub-lens unit and the third sub-lens unit changes for focusing.