Diffractive Optical Surface Lens for Smart Home Surveillance
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Solution Overview
Problem
Smart home surveillance cameras require optical lenses with low fabrication costs, large aperture, wide viewing angles, light weight, and 24-hours confocal image-capturing capability, which existing lenses fail to achieve effectively.
Innovation Solution
An optical lens design comprising a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop in between, featuring a lens with a diffractive optical surface that satisfies specific refractive power and Abbe number conditions, including 0<|(Φd*V)/Φr|<2, to achieve lighter weight, lower fabrication costs, and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If traditional optical lens designs are used, then imaging quality can be maintained, but weight and fabrication costs increase
Solution Approach 1:
The patent applies parameter changes by transitioning from traditional refractive optical surfaces to diffractive optical surfaces, fundamentally changing the optical parameter representation. The diffractive optical surface uses microlens arrays with specific pitch parameters (0.5-2.0 times the wavelength of light) to achieve optical functionality, replacing conventional curved surfaces and reducing material requirements while maintaining imaging performance
Solution Approach 2:
The patent employs composite material principles by integrating diffractive optical surfaces with microlens arrays into the lens structure. This composite approach combines refractive and diffractive optical elements in a single integrated component, achieving multi-functional optical performance with reduced weight and simplified fabrication compared to traditional multi-element lens systems
2Manufacturing precision
If more lens elements are added to improve imaging quality, then optical performance increases, but device complexity and weight increase
Solution Approach 1:
The patent merges multiple optical functions into a single diffractive optical surface structure. The microlens array integrates focusing, beam shaping, and spectral separation functions that would traditionally require multiple separate lens elements, thereby reducing structural complexity while maintaining or improving imaging quality through the unified diffractive optical design
Solution Approach 2:
The patent transitions from two-dimensional continuous curved surfaces to three-dimensional discrete microlens arrays with periodic structures. This dimensional transformation enables new optical functionality through the periodic modulation of the optical path, achieving complex imaging performance with simpler structural implementation compared to traditional multi-element designs
3Area of stationary object
If aperture is increased to improve light gathering, then viewing angle and low-light performance improve, but lens size and weight increase
Solution Approach 1:
The patent replaces traditional mechanical refractive optical surfaces with diffractive optical surfaces based on wave optics principles. The diffractive microlens arrays achieve light gathering and beam control through periodic structural modulation rather than large aperture mechanical structures, enabling equivalent optical performance with significantly reduced lens size and weight
4Adaptability or versatility
If 24-hours confocal image-capturing capability is achieved, then surveillance performance improves, but optical design complexity increases
Solution Approach 1:
The diffractive optical surface with microlens arrays achieves multi-functional performance including visible light imaging, infrared imaging, and confocal image capturing across different wavelengths and time conditions. This universal design replaces the need for separate optical systems for different surveillance requirements, maintaining adaptability while simplifying the overall optical design through a single integrated diffractive 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 optical lens design achieves lighter weight, lower fabrication costs, good imaging quality, and 24-hours confocal image-capturing capability while maintaining a wide field of view, effectively addressing the requirements of smart home surveillance cameras.
Implementation Method 1
the lens with a diffractive optical surface satisfies the condition: 0
Data Source
AI summary
An optical lens includes a first lens group with negative refractive power, a second lens group with positive refractive power, and an aperture stop disposed between the first lens group and the second lens group. A number of lenses with refractive power of the first lens group is smaller than three, and a number of lenses with refractive power of the second lens group is smaller than five. The second lens group has a lens with a diffractive optical surface, and the lens with a diffractive optical surface satisfies the condition: 0<|(Φd*V)/Φr|<2, where Φd denotes refractive power of the diffractive optical surface, Φr denotes refractive power of the lens, and V denotes an Abbe number of the lens with a diffractive optical surface.