Contactless Biometric Capture Device with Hand Positioning Stop
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Solution Overview
Problem
Existing biometric print capture devices require contact with the user's hand, which is not hygienic and does not encourage natural positioning, leading to suboptimal image quality.
Innovation Solution
A contactless biometric print capture device with a user compartment featuring a frontal opening, lateral openings for thumb passage, and a positioning stop to guide the hand into a natural positioning plane, along with lighting and blocking hoods for optimal image acquisition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If contact-based acquisition is used to ensure good image quality, then image quality is improved, but hygiene is compromised due to surface contamination
Solution Approach 1:
The patent replaces contact-based mechanical image acquisition with contactless optical scanning. The hand moves through a defined path in space without touching the device surface, and optical sensors capture the palmprint from a distance, eliminating contamination while maintaining image quality through optical field interaction instead of physical contact.
Solution Approach 2:
The patent introduces an optical field as an intermediary between the hand and the imaging system. Light interacts with the palmprint features and carries this information to sensors without requiring direct contact, serving as a mediator that transfers biometric information while maintaining hygiene separation between user and device.
2Object-affected harmful factors
If contactless acquisition is used to improve hygiene, then hygiene is improved, but intuitive hand positioning is lost leading to poor image quality
Solution Approach 1:
The patent pre-defines a specific hand movement path and positioning geometry before acquisition occurs. The system establishes predetermined spatial coordinates, lighting angles, and sensor positions that guide the user's hand through the correct trajectory, ensuring optimal positioning is achieved intuitively without requiring contact or manual adjustment.
Solution Approach 2:
The patent transitions from two-dimensional contact surface positioning to three-dimensional spatial path positioning. Instead of requiring the hand to contact a marked surface, the system defines a volumetric acquisition zone with specific trajectory requirements, adding the dimension of depth and movement path to guide intuitive hand placement while maintaining contactless operation.
3Ease of operation
If flat surface contact is used to acquire biometric print, then acquisition is achieved, but the curved palm cannot maintain contact over entire surface
Solution Approach 1:
The patent eliminates the mechanical requirement for complete surface contact by using optical sensing from a distance. The flat sensor surface no longer needs to conform to the curved palm, as optical fields can capture biometric features from a spatial offset, resolving the geometric incompatibility between flat devices and curved hands.
Solution Approach 2:
The patent moves the imaging function from the contact plane to a third dimension in space. By positioning sensors above the hand and using optical projection, the system creates a volumetric acquisition zone that accommodates the palm's natural curvature without requiring flattening or complete surface contact.
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 device ensures hygienic contactless operation and intuitive hand positioning, resulting in high-quality biometric print images without the need for manual guidance.
Implementation Method 1
the electronic compartment comprises lighting means able to generate at least one beam of light shining towards the user compartment
Implementation Method 2
the user compartment comprises an upper face comprising a transparent portion allowing the user to see at least a portion of the hand part
Implementation Method 3
the user compartment comprises a blocking hood able to block a beam of light coming from the electronic compartment at least at one of the openings that are the lateral opening, the frontal opening and the through-orifice
Data Source
AI summary
A device for capturing a biometric print of a user, the user compartment including a frontal opening designed for the passage of part of a hand into said user compartment and a lateral opening allowing the passage of the thumb of the user's hand, the lateral opening extending as far as the frontal opening to form a continuous open space, the lateral opening being delimited in a direction of insertion of the user's hand into the user compartment by a user hand positioning stop.