Finger Vein Identification Device with Contact Detection Guide
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Solution Overview
Problem
Conventional finger vein identification devices face issues with erroneous insertion or deformation of fingers, especially by users not accustomed to the operation, and the potential for false finger insertion, leading to reduced recognition accuracy and reliability.
Innovation Solution
The device incorporates an image pickup unit, a light source, a guide unit, and detection mechanisms to ensure accurate finger positioning, including contact detection and variable light power control, along with display means for guiding correct usage and updating registration data, to prevent erroneous insertions and falsified patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a guide unit is used to fix the finger in position, then the reproducibility of finger vein image pickup is improved, but the risk of erroneous insertion or deformation of the finger by users increases
Solution Approach 1:
The patent employs a detection unit that provides real-time feedback by detecting whether the finger is correctly inserted into the guide unit. The system detects contact between the finger and guide unit, and only proceeds with image pickup when correct insertion is confirmed, preventing erroneous images while guiding users through the proper insertion process
Solution Approach 2:
The system performs preliminary detection of finger insertion correctness before actually capturing the vein image. The detection unit checks finger position and contact status in advance, ensuring proper alignment is achieved before the image pickup process begins, thereby preventing deformation and erroneous captures
2Ease of operation
If the finger is inserted at variable angles or with deformation, then the ease of operation is improved, but the recognition accuracy is reduced
Solution Approach 1:
The detection unit continuously monitors finger position and provides feedback to the control unit. When the finger is inserted at incorrect angles or with deformation, the system detects this through contact sensors and prevents image pickup, guiding the user to correct the insertion姿势 before proceeding
Solution Approach 2:
The system preemptively prevents erroneous image capture by detecting incorrect finger insertion angles or deformation before the image is taken. The detection unit identifies improper insertion patterns and blocks the imaging process, thereby preventing recognition errors from occurring in the first place
3Reliability
If contact detection is implemented to detect false finger insertion, then the reliability of identification is improved, but the device complexity increases
Solution Approach 1:
The guide unit itself serves dual purposes: it guides the finger into correct position and simultaneously acts as the detection element. The contact between finger and guide unit is detected through simple contact sensors integrated into the guide structure, eliminating the need for separate complex detection systems while maintaining high reliability
Solution Approach 2:
The patent merges the guide unit and detection unit into an integrated structure. The guide unit that physically guides the finger also contains the contact detection sensors, combining two functions into one component to reduce overall system complexity while enhancing reliability through contact-based verification
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 enhances the accuracy and reliability of finger vein identification by ensuring proper finger alignment and detecting false patterns, thereby reducing recognition errors and maintaining high reproducibility even with varying user proficiency and environmental conditions.
Implementation Method 1
the infrared light incident on a finger from the back or side surface thereof is scattered in the finger and radiated outside. In the process, the hemoglobin in the blood absorbs more infrared light than the surrounding tissue
Implementation Method 2
the infrared light incident on a finger from the back or side surface thereof is scattered in the finger and radiated outside
Data Source
AI summary
A personal identification device and method prevent the reduction in the finger vein recognition rate which otherwise occur due to erroneous insertion of a finger by a user not accustomed to operation or insertion of a false finger at low cost. The device includes an imager picking up an image of a finger vein pattern, a light source emitting light adapted to be transmitted through the finger, an image operating unit matches the image, guides indicating the position of picking up the finger image, a detector detecting the contact between the finger and the guides, another light source radiating light reflected from the thick of the finger, a switch which is depressed by the forward end of the finger, a further light source emitting light transmitted through the forward end of the finger, and a light-sensor receiving the light from the further light source through the finger.