Movable Optical Sensor for Stable Biometric Detection
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Solution Overview
Problem
The challenge is to maintain stable detection accuracy of biological information, such as blood flow, in head-mounted apparatuses without degrading the accuracy due to increased contact pressure between the sensor and the skin, which affects blood flow detection.
Innovation Solution
A head-mounted apparatus with an optical sensor and a supporting mechanism that allows movement perpendicular to the contact face, using a sensor supporting mechanism with an expansion and contraction unit to maintain moderate contact pressure, and a supporting unit to prevent strong pressing on the sensor, ensuring accurate detection of biological information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the head-mounted apparatus is tightly mounted on the user's head to ensure stability, then the mounting stability is improved, but the contact pressure between the optical sensor and the skin increases, degrading the detection accuracy of biological information
Solution Approach 1:
The patent applies the dynamics principle by making the optical sensor movable in the contact direction rather than fixed. The sensor supporting mechanism allows the optical sensor to move freely along the contact normal direction, enabling it to dynamically adjust its position to maintain optimal contact pressure with the skin despite changes in head shape or mounting tightness, thus resolving the contradiction between mounting stability and detection accuracy
Solution Approach 2:
The patent applies the parameter changes principle by changing the contact pressure parameter through the movable sensor design. Instead of maintaining a fixed contact pressure, the system allows the contact pressure to vary dynamically as the sensor moves, optimizing the detection accuracy across different mounting conditions and user head shapes
2Measurement precision
If the optical sensor is closely contacted with the skin to improve detection accuracy, then the detection accuracy of biological information is improved, but the contact pressure increases and influences blood flow, degrading measurement reliability
Solution Approach 1:
The movable sensor supporting mechanism enables the optical sensor to dynamically adjust its contact pressure with the skin. By allowing movement in the contact direction, the sensor can maintain close contact for accurate detection while automatically adjusting to avoid excessive pressure that would interfere with blood flow, thus resolving the contradiction between detection accuracy and minimizing harmful effects
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 improved detection accuracy of biological information by maintaining a moderate contact pressure, reducing the impact of increased tightening on the sensor's contact pressure and conforming to the user's forehead shape, thereby enhancing the reliability of blood flow and electroencephalogram measurements.
Implementation Method 1
Japanese Patent Laid-Open No. 2013-146371 discloses a sensor that uses light to detect a blood flow
Data Source
AI summary
Disclosed herein is a head-mounted apparatus, including: an optical sensor having a contact face for contacting with the head of a user; a supporting unit disposed around the optical sensor and configured to contact with the head of the user; and a sensor supporting mechanism configured to support the optical sensor so as to permit a movement of the optical sensor in a contact direction that is a direction perpendicular to the contact face.