Zoom Lens Segmented Units for Wide Angle and Miniaturization
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Solution Overview
Problem
Existing zoom lenses for image pickup systems, particularly in monitoring cameras, face challenges in achieving a wide angle of field with high optical performance while being miniaturized, and in meeting the requirements of full HD to 4K resolution and low F-number for adequate low-light imaging.
Innovation Solution
A zoom lens configuration with a first lens unit having negative refractive power and a second lens unit with positive refractive power, where both units move along distinct loci during zooming, and specific conditional expressions are satisfied to ensure a wide angle of field, miniaturization, and high optical performance across all zoom regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the zoom lens is miniaturized to fit monitoring cameras, then the device size is reduced, but the angle of field becomes narrow and optical performance deteriorates
Solution Approach 1:
The zoom lens is divided into multiple lens units (first lens unit with negative refractive power, second lens unit with positive refractive power, and subsequent lens units) that move independently along different loci during zooming. This segmentation allows each unit to contribute differently to the overall optical performance, enabling wide angle of field coverage while maintaining a compact form factor suitable for monitoring cameras.
2Volume of moving object
If the zoom lens is miniaturized, then the device size is reduced, but the optical performance and resolution capability deteriorate
Solution Approach 1:
Different lens units are designed with specific local optical characteristics - the first lens unit has negative refractive power with specific curvature radii relationships (|R1|/|R2| between 2.0-5.0), while subsequent units have positive refractive power. This local optimization of optical properties in different segments allows high-resolution imaging performance to be achieved within a miniaturized lens structure.
3Illumination intensity
If the F number is reduced for low-light imaging, then luminosity is improved, but the lens structure becomes more complex and size increases
Solution Approach 1:
The lens units are designed to move dynamically along different loci during zooming operations. The first lens unit moves along a locus that allows effective control of light transmission, while subsequent units move along different loci. This dynamic movement configuration enables the lens to maintain low F number for improved luminosity in low-light conditions without requiring excessive structural complexity.
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 zoom lens with a wide angle of field, high optical performance, and miniaturization, capable of capturing high-resolution images from full HD to 4K with low F-number, suitable for both perimeter and diagonal fish-eye types, effectively addressing the limitations of existing lenses.
Implementation Method 1
a first lens unit having a negative refractive power and a second lens unit having a positive refractive power, in order from an object side to an image side, wherein the first lens unit and the second lens unit move along respective loci different from each other during zooming
Data Source
AI summary
A zoom lens includes in order from an object side: a first lens unit having a negative refractive power, and a second lens unit having a positive refractive power, wherein the first and second lens units move along respective loci different from each other during zooming; the first lens unit has two negative lenses arranged continuously from the object side; and a focal length of the first lens unit, a focal length of the second lens unit, a focal length of the zoom lens at a wide angle end, a focal length of a negative lens G11 arranged on most object side in the negative lenses contained in the first lens unit, and a focal length of a negative lens arranged on second most object side in the negative lenses contained in the first lens unit.