Microlens Filter Array Layout for Real-Time Multispectral Imaging
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Solution Overview
Problem
Existing multispectral image sensors using filter switching or push-broom methods suffer from low real-time performance, resulting in inconsistent spectrum acquisition times and reduced imaging precision and efficiency.
Innovation Solution
A multispectral image sensor design featuring a microlens array, filter array, and photosensitive chip sequentially arranged to allow simultaneous acquisition of optical signals across different wave bands, ensuring real-time performance and improved precision and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If filter switching method is used to acquire multispectral images, then spectral information can be obtained, but different spectrums are acquired at different moments resulting in low real-time performance
Solution Approach 1:
The filter array is divided into multiple filter units, each containing multiple filters corresponding to different wavelengths. Each filter unit can be independently controlled to switch between different spectral bands, enabling simultaneous acquisition of multiple spectrums without requiring sequential switching of the entire filter array.
Solution Approach 2:
The patent implements dynamic switching capability where different filter units can switch between different spectral bands independently and simultaneously. This dynamic control allows the system to capture multiple spectral images at the same moment, resolving the timing issue while maintaining spectral information accuracy.
2Measurement precision
If filter switching method is used, then spectral imaging can be achieved, but imaging precision and efficiency are reduced due to non-simultaneous spectrum acquisition
Solution Approach 1:
By segmenting the filter array into multiple independently controllable filter units, the system can capture multiple spectral bands simultaneously, improving both imaging precision (through consistent timing) and efficiency (through parallel acquisition).
Solution Approach 2:
The patent combines multiple spectral acquisitions into a single exposure by coordinating the switching of different filter units. This merging of acquisition operations into simultaneous capture improves both precision and efficiency.
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 solution enables simultaneous acquisition of multispectral data across multiple channels, enhancing real-time performance and imaging precision and efficiency by allowing simultaneous capture of optical signals across various wave bands.
Implementation Method 1
the microlens array includes at least one microlens unit, and the at least one microlens unit is configured to converge the incident light, and focus the converged incident light on the photosensitive chip after passing through the filter array
Implementation Method 2
the filter array includes at least one filter unit set, each of the at least one filter unit set includes a plurality of filters corresponding to different wavelengths, and each of the plurality of filters is configured for a corresponding wavelength of the incident light to pass
Implementation Method 3
the photosensitive chip includes a plurality of pixel units
Data Source
AI summary
An image sensor includes a microlens array, a filter array, and a photosensitive chip sequentially arranged along a direction of incident light. The photosensitive chip includes a plurality of pixel units. The filter array includes at least one filter unit set. Each of the at least one filter unit set includes a plurality of filters corresponding to different wavelengths. Each of the plurality of filters is configured for a corresponding wavelength of the incident light to pass. The microlens array includes at least one microlens unit. The at least one microlens unit is configured to converge the incident light, and focus the converged incident light on the photosensitive chip after passing through the filter array.