Diffraction Grating Illumination for Biometric Uniformity
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Solution Overview
Problem
Existing biometric authentication systems face challenges in achieving uniform illumination due to inaccuracies in mounting light sources, leading to non-uniform light intensity distribution in the illumination area, which affects the accuracy of biometric data capture.
Innovation Solution
The use of paired light sources and diffraction grating elements, where each light source is aligned with a corresponding diffraction grating element on a separate substrate, allows for precise alignment and compensation of mounting position errors, ensuring uniform light intensity across the illumination area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light sources are mounted on a substrate to illuminate an area, then the illumination area can be covered, but mounting position inaccuracies cause non-uniform light distribution
Solution Approach 1:
A diffraction grating element is introduced as an intermediary component between the light sources and the illumination area. This diffraction grating element disperses the light from multiple light sources to create a uniform illumination pattern, compensating for mounting position inaccuracies of the light sources.
Solution Approach 2:
The patent changes the optical parameters by using a diffraction grating element with specific groove patterns and spacing. This transforms the light distribution pattern from non-uniform (direct emission) to uniform (diffracted and dispersed), addressing the mounting precision issue.
2Illumination intensity
If light sources are precisely aligned with diffraction grating elements, then uniform illumination is achieved, but the system complexity increases with separate substrates
Solution Approach 1:
The system is segmented into two separate substrates: one for mounting light sources and another for mounting the diffraction grating element. This segmentation allows independent optimization and adjustment of each component, facilitating uniform illumination while managing system complexity through modular design.
Solution Approach 2:
The diffraction grating element serves multiple functions: it disperses light from multiple sources, corrects non-uniform illumination patterns, and compensates for mounting position errors. This multi-functionality reduces the need for additional components, managing system complexity while achieving uniform illumination.
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 enhances the uniformity of light distribution, improving the accuracy of biometric data capture and reducing errors caused by light source mounting inaccuracies, thereby enhancing the reliability of biometric authentication systems.
Implementation Method 1
a second substrate that is disposed in an illumination direction of the light of the first and second light sources with respect to the first substrate, the second substrate having first and second diffraction grating elements formed integrally therewith
Data Source
AI summary
A disclosed illumination apparatus includes first and second light sources that generate light for an illumination area to be illuminated; a first substrate on which the first and second light sources are mounted; and a second substrate that is disposed in an illumination direction of the light of the first and second light sources with respect to the first substrate, the second substrate having first and second diffraction grating elements formed integrally therewith, the first diffraction grating element being provided for the first light source, and the second diffraction grating element being provided for the second light source.