Foot Vein Authentication Using Infrared Sensor
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Solution Overview
Problem
Existing vein biometric authentication technologies are limited to recognizing vein patterns on the back of the hand or wrist, restricting their application across various fields and failing to effectively utilize vein patterns from other body parts.
Innovation Solution
A foot vein authentication device is developed, featuring a sensor unit that detects vein patterns inside the foot using infrared rays and a controller for user authentication, with a tiltable light source and image acquisition unit, and an optical system to enhance pattern detection and security.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If vein biometric authentication is limited to back of hand or wrist only, then the authentication system is simple, but the application field is restricted and cannot be diversified
Solution Approach 1:
The patent applies universality by enabling the vein authentication device to work with multiple body parts (hand, wrist, foot, ankle) using the same basic sensor and light source configuration. The device structure remains consistent while the detection location varies, allowing one device design to serve multiple authentication purposes across different body sites.
2Measurement precision
If sensor unit is disposed at lower portion of front surface covered by body part, then the vein pattern detection is improved, but the light path requires transparent material and increases device complexity
Solution Approach 1:
The patent uses a light-transmissive layer as an intermediary component between the light source and the vein pattern. This transparent layer allows infrared light to pass through while maintaining the structural integrity of the device housing, enabling the sensor to detect vein patterns through the body part without direct exposure of the sensor.
3Ease of operation
If light source and image acquisition unit are integrated and tiltable, then the detection flexibility is improved, but the device structure becomes more complex
Solution Approach 1:
The patent implements dynamics by making the light source unit and image acquisition unit tiltable rather than fixed. This allows the optical components to be adjusted to different angles to accommodate various foot positions and orientations, improving the ease of operation and adaptability of the device to different users and conditions.
4Measurement precision
If infrared filter layer is added to selectively transmit infrared rays, then the vein pattern detection accuracy is improved, but the device complexity increases
Solution Approach 1:
The patent applies local quality by incorporating an infrared filter layer specifically in the region where infrared light passes through the body part. This filter is placed only where needed to enhance the transmission of infrared wavelengths while blocking other wavelengths, thereby improving vein pattern detection accuracy without adding unnecessary complexity to the entire device.
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 solution expands the application of vein biometric techniques, improving the effectiveness of vein pattern detection and authentication by allowing the use of vein patterns from the foot, enhancing the recognition rate and security through double authentication procedures.
Implementation Method 1
a light source unit to irradiate infrared rays to the inside of the user's foot
Implementation Method 2
a light-transmissive layer disposed on the front surface and made of a transparent material so as to allow movement of light between the sensor unit and the user's foot
Implementation Method 3
The light-transmissive layer may be provided with an infrared filter layer to selectively transmit the infrared rays
Data Source
AI summary
Disclosed is a foot vein authentication device comprising: a body part having a front surface and a rear surface and on which the foot of a user is placed on the front surface; a sensor unit arranged on any one area of the body part and formed so as to detect a vein pattern on the inside of the foot of the user; and a control unit for carrying out a user authentication procedure by comparing the vein pattern received from the sensor unit, with the pre-stored vein pattern of the user, wherein the sensor unit comprises: a light source unit for emitting infrared rays at the inside of the foot of the user; and an image acquisition unit for acquiring, as an image, the vein pattern on the inside of the foot of the user, at which the infrared rays are emitted, so as to transmit the same to the control unit.