Hybrid Micromirror Array Lens Reducing Chromatic Aberration
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Solution Overview
Problem
Micromirror Array Lenses experience significant chromatic aberration when dealing with broadband wavelength ranges due to the inability to satisfy the same phase condition for multiple wavelengths, leading to increased profile discontinuity and aberration, especially when requiring large optical power.
Innovation Solution
The Hybrid Micromirror Array Lens combines the power of a continuous reflective lens with a conventional Micromirror Array Lens, using rotational and translational motions of micromirrors to simulate a curved surface profile, minimizing profile discontinuity and chromatic aberration by controlling the optical surface profile to satisfy the periodic phase matching condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If micromirror array uses translational motion to satisfy same phase condition for monochromatic light, then phase matching is achieved, but chromatic aberration increases for broadband wavelength range
Solution Approach 1:
The invention segments the optical power into two independent components: (1) rotational motion of micromirrors provides one component of optical power, and (2) translational motion provides another component. This segmentation allows the rotational degree of freedom to handle phase matching for monochromatic light while minimizing the translational displacement needed, thereby reducing profile discontinuity and chromatic aberration for broadband light.
Solution Approach 2:
The invention makes the micromirror array dynamic by enabling both rotational and translational motions. The rotational motion dynamically adjusts the orientation of each micromirror to satisfy phase matching conditions, while the translational motion dynamically compensates for optical path differences. This dynamic control allows the system to optimize performance for both monochromatic phase matching and broadband chromatic aberration reduction.
2Object-affected harmful factors
If micromirror array makes continuous reflective lens profile, then chromatic aberration is eliminated, but huge translation is required which is impractical
Solution Approach 1:
The optical power is segmented into rotational and translational components. The rotational motion of micromirrors provides a significant portion of the optical power, reducing the burden on translational motion. This segmentation enables achieving continuous reflective lens profile effects with much smaller translational distances, making the system practical while maintaining low chromatic aberration.
Solution Approach 2:
The invention adds rotational degree of freedom (another dimension) to the traditional translational micromirror adjustment. By utilizing rotation in addition to translation, the system can achieve the same optical power with reduced translational displacement, effectively trading one dimensional movement for another to solve the practical implementation problem.
3Power
If micromirror array lens requires large optical power, then optical power is increased, but number of profile discontinuity increases causing increased chromatic aberration
Solution Approach 1:
The system uses dynamic rotational motion of micromirrors to provide optical power without creating profile discontinuities. The rotational adjustment allows each micromirror to contribute to the optical power while maintaining a continuous effective reflective profile across the array, enabling large optical power with minimal chromatic aberration.
Solution Approach 2:
The invention changes the control parameters from purely translational displacement to a combination of rotational angle and translational displacement. By adjusting the rotational parameter, the system can achieve the required optical power while keeping translational displacement small, thereby maintaining profile continuity and reducing chromatic aberration even at high optical powers.
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 approach reduces chromatic aberration and allows for the generation of large optical power with minimal translational requirements, enabling variable optical properties such as focal length, optical axis, and aberration correction, while maintaining a flat micromirror arrangement.
Implementation Method 1
The micromirrors make all the light rays converged which are scattered by one point of an object into one point of an image plane by rotational motion of micromirrors
Implementation Method 2
translating each micromirror to make all converging light rays to have the same phase
Data Source
AI summary
This invention provides a Hybrid Micromirror Array Lens with reduced chromatic aberration over a broadband wavelength range of light. Conventional micromirror array lens uses phase matching condition. Therefore, the optical surface profile of Micromirror Array Lens using the same phase condition has a discontinuous surface profile. As the required optical power of Micromirror Array Lens is increased, the number of profile discontinuity of Micromirror Array Lens is increased. Therefore, the chromatic aberration is increased. To minimize the chromatic aberration, the number of profile discontinuity should be minimized. The number of discontinuity is reduced when the optical surface profile has a simulating base curve, called a translation contour with optical power. Hybrid Micromirror Array Lens is invented to reduce a large translational amount and chromatic aberration for large optical power lens.