Zoom Lens Light Splitting and Aperture Design
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Solution Overview
Problem
Existing zoom lenses face challenges in adapting to complex scenarios due to short back focal lengths, small apertures, and poor photosensitivity, limiting their ability to effectively split light and provide high-resolution imaging, especially in low luminance conditions.
Innovation Solution
A zoom lens design comprising multiple lens groups with specific refractive powers and a splitting unit using prisms to split light into different wavelengths, ensuring large apertures and target planes, and high resolution, with movable lens groups to adjust focal lengths and improve adaptability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If existing zoom lenses use short back focal length design, then the lens structure is compact, but the ability to split light is insufficient
Solution Approach 1:
The zoom lens is divided into five distinct lens groups (G1-G5) with different functions. The first lens group (G1) with negative refractive power is specifically designed to handle light splitting, while the other groups handle focusing and image formation. This segmentation allows the lens to achieve both compact size and effective light splitting capability.
2Area of stationary object
If existing zoom lenses use small aperture design, then the lens size is reduced, but photosensitivity deteriorates
Solution Approach 1:
The zoom lens design incorporates multiple lens groups that serve multiple functions simultaneously. The first lens group (G1) with negative refractive power contributes to both aperture control and light gathering, while the subsequent groups (G2-G5) with positive refractive power enhance both the aperture effect and photosensitivity. This multi-functional design allows the lens to achieve large aperture and high photosensitivity together.
3Device complexity
If existing zoom lenses use fixed lens groups, then the structure is simple, but adaptability to different scenarios is limited
Solution Approach 1:
The zoom lens incorporates movable lens groups (G2, G3, G4, G5) that can be positioned at different locations along the optical axis to achieve different focal lengths and adapt to various imaging scenarios. The first lens group (G1) remains fixed to maintain the light splitting function, while the other groups are dynamically adjustable. This dynamic design enables the lens to adapt to different scenarios while maintaining a relatively simple overall structure.
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 design achieves high imaging performance under low luminance and diverse environmental conditions, enhancing adaptability and image quality in applications like video surveillance and intelligent traffic monitoring.
Implementation Method 1
a splitting unit; wherein the splitting unit may include at least two prisms, wherein two adjacent surfaces of the at least two prisms are covered by materials configured to split different wavelengths of light
Implementation Method 2
a first lens having negative refractive power; a second lens having positive refractive power
Data Source
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AI summary
Provided are a zoom lens and an optical device using the same. The zoom lens may include in order from an object side to an image side: a first lens group (G1), a second lens group (G2), a third lens group (G3), a fourth lens group (G4); and a fifth lens group (G5). The zoom lens may satisfy the following conditions: -2.28≤f 2/f w '≤-1.08, and 0.15≤TTL/ (BFL *f w ')≤0.45, wherein f 2 denotes a focal length of the second lens group, f w 'denotes a focal length of the zoom lens at a wide angle end, TTL denotes a total track length of the zoom lens, and BFL denotes a back focal length of the zoom lens.