Multispectral Optical Element Aperture Centroid Alignment
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Solution Overview
Problem
Existing optical systems face challenges in capturing high-quality multispectral images due to image deviation and double images caused by defocus, particularly when the centroid of aperture regions does not align with the optical axis.
Innovation Solution
The optical element and imaging apparatus employ a configuration where optical filters with different wavelength ranges are mounted in aperture regions with corresponding shapes and sizes, ensuring the centroid of each filter aligns with the optical axis, and polarizing filters are used to manage polarization directions, thereby minimizing image shift during defocus and enhancing image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If aperture regions are positioned away from the optical axis to capture multispectral images, then spectral diversity is improved, but image deviation and double images occur due to defocus
Solution Approach 1:
The patent employs symmetric arrangement of aperture regions around the optical axis, where each aperture region is positioned at equal distances from the optical axis. This symmetric configuration ensures that image deviations and double images caused by defocus are minimized, as the optical paths from symmetric positions converge properly on the image sensor plane
Solution Approach 2:
The patent positions multiple aperture regions at equivalent optical distances from the optical axis, creating equipotential conditions for light paths. By ensuring that all aperture regions are equidistant from the optical axis, the system achieves uniform focus characteristics across different spectral bands, preventing image deviation while maintaining spectral diversity
2Loss of information
If multiple optical filters with different wavelength ranges are used, then spectral information is improved, but image shift increases during defocus
Solution Approach 1:
The patent divides the optical system into multiple aperture regions, each equipped with optical filters for different wavelength ranges. By segmenting the aperture into symmetric regions around the optical axis, each filter can capture specific spectral information while the symmetric arrangement ensures that all segments maintain consistent focus, preventing image shift during defocus
Solution Approach 2:
The patent assigns different optical filter characteristics to different aperture regions based on their positional relationships with the optical axis. Each region is optimized for specific wavelength ranges while maintaining symmetric positioning, ensuring that local spectral information is captured without compromising overall image stability
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 configuration effectively suppresses image shift and double images across a wide defocus range, enabling the capture of high-quality multispectral images by aligning aperture centroids with the optical axis and managing polarization directions.
Implementation Method 1
a plurality of optical filters that are mounted in the plurality of aperture regions, the plurality of optical filters including at least two types of filters having different wavelength ranges of transmitted light
Implementation Method 2
polarizing filters are used to manage polarization directions
Data Source
AI summary
One embodiment according to the technology of the present disclosure provides an optical element, an optical device, and an imaging apparatus, which can acquire a multispectral image having a good image quality. An optical element according to one aspect of the present invention includes: a frame having a plurality of aperture regions; and a plurality of optical filters that are mounted in the plurality of aperture regions, the plurality of optical filters including at least two types of filters having different wavelength ranges of transmitted light, and centroids of at least two types of aperture regions coincide with each other.