Blood Flow Authentication Ring With Finger-Size Focus Compensation
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Solution Overview
Problem
Existing blood flow reader rings suffer from out-of-focus images due to varying finger sizes, reduced contrast from stray light reflection, and complex personal registration processes.
Innovation Solution
A blood flow authentication ring with a size compensation member and low reflection member, equipped with an irradiation device and imaging device, automatically registers users and maintains focus and contrast regardless of finger size, using near-infrared or red light, and incorporates a solar panel for power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a blood flow reader ring uses infrared light emission and reflection to capture blood flow images, then the authentication function can be performed, but the infrared light is reflected on the inner circumference of the ring causing stray light and reducing image contrast
Solution Approach 1:
A light-shielding member is introduced as an intermediary component between the infrared light source and the ring inner circumference. This member blocks the path of infrared light from reflecting off the inner circumference, thereby eliminating stray light while preserving the authentication function
Solution Approach 2:
The harmful reflection path is extracted and blocked by the light-shielding member. The member is positioned to intercept and block the infrared light before it can reflect off the inner circumference, separating the useful light path from the harmful reflection path
2Adaptability or versatility
If the distance from imaging surface to finger surface varies due to finger size differences, then the ring can accommodate different users, but out-of-focus images are produced
Solution Approach 1:
The ring incorporates an adjustable component that allows dynamic adaptation to different finger sizes. The component can be adjusted to maintain optimal focusing distance regardless of whether the user has a larger or smaller finger, thereby preserving image focus while accommodating size variations
Solution Approach 2:
The focusing parameter of the imaging system is made adjustable to compensate for variations in finger size. By changing the focusing distance parameter according to the user's finger dimensions, the system maintains sharp images across different user types
3Reliability
If a button is provided on the blood flow reader ring for registration operations, then personal authentication can be performed, but the registration operations become complicated and the button placement restricts ring size
Solution Approach 1:
The mechanical button component is removed from the ring design. Instead, automatic registration is achieved through contactless detection of the finger's blood flow characteristics, eliminating the need for physical buttons and simplifying the registration process
Solution Approach 2:
The mechanical button-based registration system is replaced with an optical/electromagnetic detection system. The system automatically detects and registers personal authentication information by analyzing blood flow patterns captured by the imaging device, eliminating mechanical interaction requirements
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 ring provides clear, focused blood flow images with high contrast and simplified registration, ensuring reliable authentication without external power sources and mechanical buttons.
Implementation Method 1
light emitted by the irradiation device is at least one of near-infrared light and red light
Implementation Method 2
an imaging device configured to capture an image of light transmitted through the finger
Implementation Method 3
the low reflection member has a reflectivity of less than 10%
Data Source
AI summary
Provided is a blood flow authentication ring that can achieve focus in a captured image regardless of finger size, can prevent reduction of contrast due to external light, or simplifies personal registration. A blood flow authentication ring in an embodiment of the present invention is a blood flow authentication ring having a ring-shaped cover member to be worn on a finger and configured to perform authentication with finger blood flow. The cover member at least includes an irradiation device to irradiate the finger with light and an imaging device to capture an image of light transmitted through the finger. An adjusting member is provided between an inner circumference of the cover member and the finger. The adjusting member has a function of at least one of a size compensation member and a low reflection member.