Finger Vein Input Device Segmented Case Design
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Solution Overview
Problem
Existing finger vein authentication devices face challenges in maintaining high authentication accuracy and user comfort due to issues with outside light interference and the design of shielding mechanisms, which can cause unease and difficulty in positioning the finger.
Innovation Solution
A finger vein pattern inputting device with a partially closed case design, featuring a hood part and side parts that block outside light while allowing near-infrared radiation to pass through, and an open front and base for easy finger placement, ensuring high operability and accuracy by minimizing light interference and user discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed-type imaging space is used to block outside light, then authentication accuracy is improved, but user comfort deteriorates due to confined space feeling
Solution Approach 1:
The case is divided into multiple parts: a closed hood part for blocking light, open side parts for visibility, and an open base for finger insertion. This segmentation allows the device to provide both light shielding and user comfort simultaneously by closing only the necessary portions for authentication while leaving other areas open.
Solution Approach 2:
Different parts of the case have different opening/closing characteristics. The hood part is closed to block light, while the side parts and base remain open to maintain visibility and ease of finger placement. This local differentiation resolves the contradiction between light blocking and user comfort.
2Measurement precision
If complete light shielding is implemented, then image quality is improved, but finger positioning becomes difficult due to lack of visibility
Solution Approach 1:
The light shielding is segmented to cover only the imaging area through the hood part, while the side parts remain open to provide visibility for finger positioning. This allows the system to maintain image quality through selective light blocking while preserving visibility where needed.
Solution Approach 2:
The open side parts act as intermediaries that allow users to see and position their fingers while the hood part blocks extraneous light. This intermediary structure enables both functions to coexist without conflict.
3Ease of operation
If transparent shielding members are used to allow finger visibility, then ease of operation is improved, but light blocking effectiveness deteriorates
Solution Approach 1:
The shielding structure is segmented into transparent side parts for visibility and an opaque hood part for effective light blocking. This segmentation allows the device to provide both finger visibility and effective light blocking in different regions simultaneously.
Solution Approach 2:
Different materials are used in different regions: transparent materials in side parts for visibility and opaque materials in the hood part for light blocking. This local quality differentiation resolves the contradiction between visibility and light blocking effectiveness.
4Reliability
If outside light is blocked completely, then authentication accuracy is improved, but device complexity increases due to complete enclosure requirements
Solution Approach 1:
The enclosure is segmented into a closed hood part for light blocking and open side/base parts for accessibility. This segmentation achieves effective light blocking without requiring complete enclosure, thereby reducing device complexity while maintaining authentication accuracy.
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 achieves high authentication accuracy and user comfort by effectively blocking outside light and allowing easy finger placement, reducing image processing time and improving contrast, thus enhancing the reliability of finger vein pattern recognition.
Implementation Method 1
a second part for passing a near-infrared ray, which transmitted the finger and formed a finger vein pattern
Implementation Method 2
a hood part that is provided with a light emitting part
Data Source
AI summary
The present invention is adapted to form a finger table for supporting and locating a finger to be authenticated by touching the front part of the finger in a case, make the case closed at parts corresponding to the tip and the base of the finger to be authenticated and parts corresponding to left and right sides of the finger, make the case opened at parts corresponding to the front part and the backside of the finger, and form an imaging range of imaging means such as an imaging element in the parts corresponding to the left and right sides of the finger. With the configuration, a finger vein pattern inputting device with high operability and authentication accuracy reserved is provided.