Compact Spectral Imaging via Filter and Lens Array Integration
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Solution Overview
Problem
Conventional spectrometers are bulky and heavy, making them unsuitable for small, high-resolution applications, and there is a need for a more integrated and compact spectral imaging solution.
Innovation Solution
A spectral imaging apparatus featuring an optical filter with band filter units of different center wavelengths and an imaging lens array, both integrated on a transparent substrate or monolithically with a sensing device, which allows for compact and efficient spectral imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectrometers are used, then spectral imaging capability is achieved, but the device becomes bulky and heavy
Solution Approach 1:
The spectrometer is segmented into multiple independent components: a microlens array for light collection, an optical filter array with multiple band filter units for wavelength selection, and a pixel array for detection. Each component is miniaturized and integrated on a single substrate, transforming a bulky monolithic device into a compact modular system that maintains spectral imaging capability while dramatically reducing weight and size.
Solution Approach 2:
The patent transitions from traditional linear optical paths to a two-dimensional array configuration. Multiple band filter units are arranged in a matrix pattern corresponding to multiple pixels, enabling parallel spectral measurements across different spatial locations. This dimensional transformation allows the device to achieve high-resolution spectral imaging in a compact footprint, resolving the contradiction between imaging capability and device size.
2Volume of moving object
If multiple optical elements are integrated on a single substrate, then device size is reduced, but manufacturing complexity increases
Solution Approach 1:
The substrate serves multiple functions simultaneously: it supports the microlens array for light focusing, holds the optical filter array for wavelength selection, and provides structural integration for the pixel array. This multi-functional design consolidates what would traditionally require multiple separate components and assembly steps into a single manufacturing process, reducing overall device size while actually simplifying manufacturing through functional integration.
Solution Approach 2:
The patent employs standard semiconductor fabrication parameters and materials that can be precisely controlled during manufacturing. By designing the optical elements with parameters optimized for standard fabrication processes (such as specific thicknesses for filter layers and lens curvatures achievable through conventional lithography), the device achieves miniaturization without proportionally increasing manufacturing complexity. The systematic arrangement of elements follows regular patterns that facilitate automated fabrication.
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 the creation of a compact, high-resolution spectral imaging apparatus that can perform single-wavelength imaging across multiple regions, reducing optical crosstalk and facilitating easier fabrication, while maintaining the ability to handle various angles of incidence.
Implementation Method 1
Bragg reflection layers respectively provided on an upper surface and a lower surface of the cavity layer
Implementation Method 2
an optical filter including a plurality of band filter units having different center wavelengths
Implementation Method 3
an imaging lens array including a plurality of lens units which respectively correspond to the plurality of band filter
Implementation Method 4
Each of the plurality of lens units may include at least one convex lens
Implementation Method 5
a sensing device configured to receive light passing through the optical filter
Data Source
AI summary
Provided is a spectral imaging apparatus. The spectral imaging apparatus includes: an optical filter including a plurality of band filter units having different center wavelengths; a sensing device configured to receive light passing through the optical filter; an imaging lens array including a plurality of lens units which respectively correspond to the plurality of band filter units and each implement imaging on the sensing device; and a transparent substrate which is apart from the sensing device. At least one of the optical filter and the imaging lens array is provided on the transparent substrate.