Optical Lens Diffractive Surface Chromatic Aberration Correction
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Solution Overview
Problem
Smart home surveillance cameras require optical lenses that are thinner, have high optical performance, low fabrication costs, large aperture, wide viewing angles, and 24-hours confocal image-capturing capability, which existing lenses fail to achieve effectively.
Innovation Solution
The optical lens design includes a first lens group with negative refractive power, a second lens group with positive refractive power and a diffractive optical surface, and an aperture stop, satisfying the condition 2<(Φd*V)/Φr<5, where Φd is the refractive power of the diffractive optical surface, Φr is the refractive power of the lens, and V is the Abbe number, to achieve lighter weight, lower fabrication costs, and good imaging quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a conventional optical lens design is used, then the lens can achieve basic imaging function, but the weight is heavy and fabrication cost is high
Solution Approach 1:
The patent combines refractive and diffractive optical functions into a single lens structure. The lens includes a refractive portion for bulk focusing and a diffractive optical element integrated on the lens surface, merging two optical correction mechanisms into one component to reduce overall system weight and complexity while maintaining imaging quality
Solution Approach 2:
The lens employs composite optical design combining refractive and diffractive optical elements. The refractive portion uses conventional glass materials while the diffractive element incorporates microstructured surfaces, creating a composite optical system that achieves superior performance with reduced weight and cost
2Adaptability or versatility
If the lens aperture is increased to improve viewing angle, then the viewing angle widens, but chromatic aberration increases
Solution Approach 1:
The diffractive optical element acts as an intermediary between the refractive portion and the image sensor. It introduces a phase compensation function that counteracts chromatic aberrations introduced by the refractive elements, enabling wider aperture while maintaining color accuracy through wavelength-dependent phase modulation
Solution Approach 2:
The patent changes the optical phase parameters by introducing a diffractive phase profile on the lens surface. This phase modulation is wavelength-dependent and can be designed to compensate for chromatic aberrations, allowing the lens to maintain sharp focus across different wavelengths while achieving wide viewing angles
3Reliability
If the lens is designed for 24-hours confocal image-capturing capability, then the imaging quality is maintained across different wavelengths, but the lens structure becomes more complex
Solution Approach 1:
The patent merges refractive and diffractive optical correction into a single integrated lens structure. The diffractive element is fabricated directly on the lens surface, combining multiple optical functions (focusing, chromatic correction, and confocal capability) into one component rather than requiring separate elements for each function
Solution Approach 2:
The lens design achieves multi-functionality by incorporating a diffractive optical element that can correct chromatic aberrations for multiple wavelengths simultaneously. This universal correction approach enables 24-hours confocal image-capturing capability across visible and infrared spectra without requiring multiple specialized lenses
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
This design enables the optical lens to achieve lighter weight, lower fabrication costs, and 24-hours confocal image-capturing capability while maintaining good imaging quality by effectively correcting chromatic aberrations across different wavelengths.
Implementation Method 1
a lens with a diffractive optical surface... Φd denotes refractive power of the diffractive optical surface
Implementation Method 2
Φr denotes refractive power of the lens... effectively correcting chromatic aberrations
Data Source
AI summary
An optical lens includes a first lens group, a second lens group and an aperture stop. The first lens group and the second lens group are arranged in order along a direction, and the aperture stop is disposed between the first lens group and the second lens group. The second lens group has positive refractive power and a lens with a diffractive optical surface, and the optical lens satisfies the condition: 2<(Φd*V)/Φr<5, 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.