Conductive Eartips for Biometric Sensing in Sleep Masks
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Solution Overview
Problem
Individuals face challenges in relaxing and falling asleep due to racing thoughts and mind wandering, which are often exacerbated by stress and anxiety, and existing relaxation techniques may not consistently effectively address these issues without adverse effects.
Innovation Solution
A smart relaxation mask equipped with biometric sensors and electrically conductive eartips that monitor biometric parameters to identify racing mind states, adjusting auditory, haptic, or visual stimuli using AI to guide users into a relaxation state, incorporating a closed-loop system to optimize sensory outputs based on historical data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electrically conductive material is added to the eartip to enable biometric sensing, then the functionality for detecting racing mind state is improved, but the material complexity and manufacturing difficulty increase
Solution Approach 1:
The eartip is constructed using composite materials: an elastomeric base material combined with electrically conductive particles or conductive elastomer. This composite structure provides both the mechanical properties needed for ear canal comfort and sealing, and the electrical conductivity required for biometric sensing. The combination of insulating elastomer with conductive additives creates a material that simultaneously achieves electrical functionality and mechanical performance.
Solution Approach 2:
The electrically conductive properties are applied locally to specific portions of the eartip rather than the entire structure. The conductive material is concentrated in the second portion that contacts the ear canal, while the first portion that interfaces with the earbud may use different material properties. This localized application reduces overall material complexity while maintaining sensing capability where needed.
2Manufacturing precision
If a two-shot molding process is used to form the eartip with different material portions, then the manufacturing precision and material property distribution are improved, but the manufacturing process complexity increases
Solution Approach 1:
The eartip is divided into two distinct portions formed in separate molding steps: a first portion that provides structural support and interfaces with the earbud, and a second portion that provides sealing and biometric sensing functionality. This segmentation allows each portion to be optimized with appropriate material properties and formed using molding parameters suited to that specific function, achieving superior material property distribution.
Solution Approach 2:
The two-shot molding process forms the second portion by molding material directly over the first portion, creating a nested structure where one material layer is integrated with another. This nesting approach ensures precise alignment and bonding between the two portions while maintaining the advantages of separate material optimization for each functional region.
3Ease of operation
If the second portion is made softer with lower durometer for comfort, then the ease of operation and user comfort are improved, but the structural strength may be reduced
Solution Approach 1:
Different durometer values are assigned to different portions of the eartip based on local functional requirements. The second portion that contacts the ear canal is made softer (lower durometer) to provide comfort and conformability, while the first portion that provides structural support maintains higher strength (higher durometer). This local differentiation of material properties optimizes both comfort and structural integrity.
Solution Approach 2:
The eartip uses composite construction with elastomeric materials of different durometers bonded together. The softer elastomeric portion provides comfort and sealing, while the harder elastomeric portion provides structural strength. The composite structure allows each material to perform its optimal function without compromising the other.
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 smart relaxation mask effectively helps users relax and fall asleep by adapting sensory outputs in real-time to address racing thoughts, improving sleep quality and reducing stress without unnecessary stimulation.
Implementation Method 1
a second portion that overlies the aperture and is formed of an electrically conductive material. An electrically conductive plug has a first end disposed within the aperture and a second end coupled to the second portion to provide an electrically conductive path between the second portion and the cavity
Data Source
AI summary
An eartip includes a first portion that defines a cavity for receiving an earbud and an aperture. The eartip also includes a second portion that overlies the aperture and is formed of an electrically conductive material. An electrically conductive plug has a first end disposed within the aperture and a second end is coupled to the second portion to provide an electrically conductive path between the second portion and the cavity.