Integrated Optical and Dielectric Microsystem for Security Feature Detection
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Solution Overview
Problem
Existing solutions for recognizing and authenticating security features on securities and documents are often complex and costly, requiring sophisticated sensor arrangements that are not easily integrated into various systems.
Innovation Solution
A miniaturized microsystem comprising a carrier substrate with a reflecting optical component and a capacitor, which uses LEDs or lasers as light sources and a segmented photodiode to detect optical and dielectric properties of security features, allowing for simultaneous and universal recognition of features without the need for complex alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple independent sensors are used to detect both optical and dielectric properties, then detection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the optical sensor (photodiode) and dielectric sensor (capacitor) onto a single carrier substrate, integrating multiple sensing functions into one unified device. This merging eliminates the need for separate sensor arrangements, reducing alignment complexity while maintaining the ability to detect both optical and dielectric properties of security features
Solution Approach 2:
The carrier substrate serves as a universal platform that supports both optical and dielectric sensing functions simultaneously. The integrated design allows a single device to perform multiple detection tasks (optical property detection via photodiode, dielectric property detection via capacitor) without requiring separate specialized sensors for each function
2Measurement precision
If sophisticated sensor arrangements are used to detect security features, then detection precision is improved, but ease of manufacture and integration deteriorates
Solution Approach 1:
The sensor is segmented into distinct functional components (photodiode for optical detection, capacitor for dielectric detection) that are independently fabricated on the carrier substrate. This segmentation allows each component to be optimized for its specific function while maintaining simple overall manufacturing and integration processes
Solution Approach 2:
The patent transitions from a mechanical alignment approach to an integrated circuit approach, where sensor components are positioned precisely through semiconductor fabrication processes rather than mechanical assembly. This dimensional shift from macro-scale mechanical alignment to micro-scale integrated circuit manufacturing dramatically simplifies the integration process while maintaining high detection precision
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
Enables reliable and cost-effective detection of security features, suitable for both optical and dielectric properties, with a compact design that can be easily integrated into existing or new systems, including mobile applications.
Implementation Method 1
The optical reflection component comprises at least one light source and at least one optical sensor. The light source is used to emit light onto the predetermined features to be recognized. The optical sensor detects the light reflected from the features.
Implementation Method 2
The capacitor is formed for example in the form of a stray field capacitor by electrodes and is used to detect dielectric properties or also to measure other electrical properties of the predetermined features to be recognized. The dielectric properties of the features to be recognized influence the capacitance of the capacitor
Implementation Method 3
The light source is preferably formed by at least one LED (light-emitting diode)
Data Source
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AI summary
The present invention relates to a microsystem for recognizing predetermined features of valuable papers, security documents, or other products, for example, for reliably recognizing security features on bank notes. The invention further relates to a testing device for testing the authenticity of valuable papers, security documents, or products. The microsystem according to the invention is based on a substrate (01), for example, in the form of a semiconductor chip. On the substrate (01), sensors in the form of at least one diffuse-reflection optical component (02) and one capacitor (03) are arranged directly or indirectly over layers (25) lying therebetween. The diffuse-reflection optical component (02) is used to detect optical characteristics of predetermined features that are arranged on or in the valuable papers, security documents, or other products to be recognized. The diffuse-reflection optical component (02) comprises at least one light source (04) and at least one optical sensor. The light source (04) is used to emit light onto the predetermined features to be recognized. The optical sensor (12) detects the light diffusely reflected by the features. The capacitor (03) is formed by electrodes (21, 22, 23, 24) and is used to detect dielectric characteristics or to measure other electrical characteristics of the predetermined features to be recognized.