Finger-vein Authentication Apparatus with Rear-mounted Camera
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Solution Overview
Problem
Conventional finger-vein authentication apparatuses face challenges in achieving a balance between small-size and thin-type implementation while maintaining high authentication accuracy, with issues related to light intensity, vein imaging quality, and external light interference degrading the imaging process.
Innovation Solution
The apparatus features a light source positioned on one side and a camera on the other, with a groove-shaped structure guiding the finger and providing a light-shielding mechanism to prevent external light interference, ensuring clear vein imaging and reducing pressure on the finger, thus enhancing authentication accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light source and camera are integrated on the finger's ball-side to eliminate protrusions, then the apparatus becomes more compact and space-saving, but the thickness of the entire apparatus increases
Solution Approach 1:
The patent repositions the camera from the ball-side to the rear-side of the finger, changing the spatial arrangement from a planar integration to a three-dimensional configuration. This allows the light source and camera to be separated along the thickness direction, reducing the lateral footprint while managing the thickness through strategic component placement on the rear surface.
2Volume of moving object
If the apparatus is designed as thin-type and small-size, then the convenience and security are enhanced, but the imaging quality degrades due to insufficient light intensity and external light interference
Solution Approach 1:
The patent extracts the camera from the ball-side integration and positions it on the rear-side of the finger. This separation allows the light source to be optimally positioned on the ball-side for illumination while the camera captures images from the rear, reducing external light interference and improving vein imaging quality in a compact form factor.
Solution Approach 2:
The patent implements different functional zones: the ball-side is optimized for light source placement and finger contact, while the rear-side is optimized for camera placement and image capture. This local differentiation allows each component to operate in its optimal environment, improving overall imaging quality while maintaining a thin profile.
3Measurement precision
If the light source is positioned on the ball-side for clear vein imaging, then the imaging quality improves, but external light interference degrades the authentication accuracy
Solution Approach 1:
The patent extracts the camera from the light source position and places it on the rear-side of the finger. This spatial separation allows the light source to illuminate the finger from the ball-side while the camera captures transmitted light from the rear, effectively isolating the imaging path from external light interference and improving 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
This configuration allows for a compact, high-convenience finger-vein authentication system with improved imaging quality and accuracy, reducing the risk of vein pattern distortion and enhancing security through precise vein pattern recognition.
Implementation Method 1
the finger is illuminated with near-infrared light, then being seen through with the near-infrared light which has passed through the inside of the finger... the near-infrared light is caused to enter the inside of the finger from a part of the ball side of the finger... using the light which travels in the inside of the finger while being scattered there
Implementation Method 2
hemoglobin in the blood which is flowing in the vein absorbs the near-infrared light. As a result, in the vein part, the light is weakened after transmitting there
Data Source
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AI summary
There is provided a finger-vein authentication apparatus including a light source (114) for illuminating one surface of both side-surfaces of a fingertip of a finger (102) with light, and an image sensor (112) for imaging the other surface of the fingertip, the light source (114) and the image sensor (112) being positioned at both sides of a nail of the fingertip with the nail sandwiched therebetween, wherein a fingertip guidance jig (104) for supporting the fingertip and a finger-root guidance jig (106) for supporting a finger-root of the finger (102) are disposed between the light source (114) and the image sensor (112), a light-shielding unit (116) being disposed on the light-source side, the light-shielding unit (116) being used for shielding the illumination light such that the illumination light will not travel to a ball side of the finger (102).