Bio-information Measurement Assembly with Nested Optical and Force Sensors
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Solution Overview
Problem
Current bio-information measurement devices are not adequately miniaturized for wearable and mobile applications, leading to reduced measurement accuracy and increased complexity, while also being limited in their ability to non-invasively measure bio-signals in various environments.
Innovation Solution
A compact bio-information measurement assembly featuring a finger contact interface with a force sensor and a bio-sensor, supported by a guide hole and non-slip structure, which includes a light receiver and emitter for PPG signal measurement, and a processor for estimating bio-information, allowing for accurate and non-invasive measurement on various electronic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the bio-information measurement device is miniaturized for wearable and mobile applications, then the device size is reduced and portability is improved, but measurement accuracy deteriorates
Solution Approach 1:
The patent implements nesting by placing the light receiver inside the support structure, with the guide hole passing through the support to receive the interface shaft. The force sensor is positioned around the guide hole, creating a compact nested arrangement where multiple functional components occupy overlapping spatial volumes, thereby reducing overall device size while maintaining measurement capabilities
Solution Approach 2:
The patent transitions from a planar two-dimensional sensor arrangement to a three-dimensional configuration by positioning the light receiver at a different depth level within the support, with the interface shaft extending through the guide hole. This vertical stacking in the third dimension allows compact integration of optical and force sensing functions without compromising measurement accuracy
2Volume of moving object
If the bio-information measurement device is miniaturized, then the device becomes more portable, but device complexity increases
Solution Approach 1:
The support structure serves multiple functions simultaneously: it provides mechanical support for the light receiver, contains the guide hole for interface shaft movement, and positions the force sensor around the guide hole. This multi-functionality reduces the number of separate components needed, simplifying the overall device architecture while achieving miniaturization
Solution Approach 2:
The patent merges the support structure with the optical measurement function by integrating the light receiver mounting and guide hole formation into a single support component. The force sensor is also integrated around the guide hole, combining structural support and sensing functions in one unified assembly, thereby reducing component count and simplifying device complexity
3Ease of operation
If the finger contact interface is designed for non-invasive measurement, then user comfort is improved, but measurement reliability deteriorates
Solution Approach 1:
The force sensor provides real-time feedback on the contact force applied by the user's finger to the interface shaft. This feedback mechanism allows the system to monitor and maintain optimal contact pressure for accurate optical measurements, ensuring measurement reliability while keeping the interface comfortable for non-invasive use
Solution Approach 2:
The guide hole and interface shaft are designed to preliminarily establish proper alignment and contact between the finger and sensor before measurement begins. The linear guidance of the interface shaft within the guide hole ensures that the finger is correctly positioned and applies force in the intended direction, pre-conditioning the measurement setup for reliable results
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 solution enhances measurement accuracy and compactness, enabling reliable bio-information measurement on wearable and mobile devices, improving user convenience and applicability in diverse environments.
Implementation Method 1
a light receiver mounted on the support, and that is configured to receive light reflected from an irradiated tissue of the finger in contact with the finger contact interface
Implementation Method 2
The light receiver comprises a photodetector mounted on the support
Implementation Method 3
a force sensor configured to measure the contact force of the finger applied to the finger contact interface
Implementation Method 4
The support comprises a guide hole through which a part of the finger contact interface is inserted, and that is configured to linearly guide the movement of the finger contact interface
Implementation Method 5
a lens configured to collect incident light and transmit the incident light to the photodetector
Implementation Method 6
an optical filter configured to receive the incident light and pass light of a specific wavelength range to the photodetector
Data Source
AI summary
An assembly for measuring bio-information includes a finger contact interface configured to move based on a contact force applied by a finger of a user to the finger contact interface; a bio-sensor configured to measure the bio-information of the user based on the finger being in contact with the finger contact interface; a force sensor configured to measure the contact force of the finger applied to the finger contact interface; and a support configured to guide movement of the finger contact interface and support the force sensor against the finger contact interface.