Rolled Fingerprint Capture with Interactive Surface Guidance
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Solution Overview
Problem
Current fingerprint recording technologies face challenges in achieving high-quality, error-free rolled fingerprint recordings due to user behavior and the lack of interactive guidance, leading to suboptimal image quality and increased maintenance costs.
Innovation Solution
A device with a laminated body containing a sensor layer and a light source that generates visually visible patterns for user information, allowing for interactive guidance during the rolling process, ensuring correct positioning, speed, and direction, while minimizing ambient light influence through controlled illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a device with moving components is used for image recording, then image recording quality is improved, but device reliability deteriorates due to intensive maintenance requirements and failure proneness
Solution Approach 1:
The patent replaces mechanical moving components with a stationary sensor array that captures the entire fingerprint image at once. Instead of using mechanical scanners or moving parts to record the fingerprint, the invention uses a fixed contact surface with embedded sensors that detect the fingerprint pattern statically, eliminating maintenance issues while preserving high-quality image capture
2Ease of operation
If user guidance is provided via external screens, then user information is delivered, but operation complexity increases due to repeated gaze switching between contact surface and screen
Solution Approach 1:
The patent combines the guidance display functionality directly into the contact surface itself. The contact surface can display visual information, instructions, or feedback directly where the user places their finger, eliminating the need for separate external screens and reducing the complexity of operating the device by keeping all information in one location
3Adaptability or versatility
If ambient light is present during recording, then recording environment is flexible, but image quality deteriorates due to interference with optical detection
Solution Approach 1:
The patent implements selective illumination where specific regions of the contact surface are illuminated with controlled light sources during the recording process. This localized lighting approach ensures that the fingerprint area receives adequate illumination for high-quality detection while minimizing ambient light interference, and the illumination can be adjusted based on environmental conditions to maintain flexibility
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 high-quality, error-free rolled fingerprint recordings by providing real-time user guidance and improved image quality, reducing the need for trained personnel and maintaining device reliability.
Implementation Method 1
a light source is present, which has lighting elements that can be controlled individually or in groups, in such a way that light components from the light source can pass through the support surface
Implementation Method 2
optical arrangements are currently used, which work according to the principle of 'frustrated total internal reflection' (Frustrated Total Internal Reflection - FTIR - often just called TIR)
Data Source
Figure 1a~1b
Figure 2a~3
Figure 4a~4b
AI summary
The invention relates to a device and a method for directly capturing fingerprints of a rolled finger. The object of providing a means for the optimal capture of rolled fingerprints by a user through visually indicated influence on the rolling motion during the rolling process is achieved according to the invention by directly capturing the rolled finger using a layered body with a sensor layer consisting of a two-dimensional matrix of sensor elements and a parallel, opposite support surface on which the finger can be rolled. This is achieved by ensuring that the distance between the sensor layer and the support surface is less than five times the center-to-center distance of two adjacent sensor elements. A light source is also provided, from which light components can be generated through the support surface as visually perceptible patterns for user information with spatial and temporal reference to the rolling finger, using individually or group-controllable light elements.and an electronic control system that controls the light source in different areas of the surface to generate a time-varying pattern.