Earphone Proximity Sensor Cover for Ambient Light Interference
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Solution Overview
Problem
Bluetooth earphones with proximity sensors face interference from ambient light, which affects the accuracy of wearing status detection, leading to power inefficiencies.
Innovation Solution
An earphone with a non-porous, low light transmittance sensing cover is designed to reduce ambient light interference, featuring a 0.5-1 mm thick sensing cover made of materials like polyoxymethylene or transparent epoxy resin, combined with a proximity sensing package structure and an audio module connected to a control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the proximity sensor is exposed to detect reflected light, then the sensing function can be achieved, but ambient light interference occurs affecting measurement accuracy
Solution Approach 1:
A sensing cover is introduced as an intermediary component between the ambient light and the proximity sensor. This cover selectively blocks ambient light while allowing the specific wavelength of reflected light from the object to pass through, thereby mediating the interaction between light sources and the sensor to eliminate interference.
Solution Approach 2:
The sensing cover is designed with non-uniform optical properties - it has different light transmittance characteristics for different wavelengths. Specifically, it has low transmittance for ambient light wavelengths and high transmittance for the reflected light wavelength, creating local quality variations to achieve selective light transmission.
2Measurement precision
If a sensing cover is added to block ambient light, then ambient light interference is reduced, but the structure becomes more complex
Solution Approach 1:
The sensing cover is designed to perform multiple functions simultaneously: it blocks ambient light interference, protects the proximity sensor from environmental factors, and maintains optical transparency for the sensing wavelength. By integrating these functions into a single component, the overall device complexity is minimized.
Solution Approach 2:
The sensing cover is implemented as a thin film or shell structure that is optically transparent to the sensing wavelength while providing the necessary light blocking and protection functions. This thin-film approach reduces structural complexity compared to bulkier light-blocking mechanisms.
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 the accuracy of distance sensing while providing dustproof and waterproof benefits, improving the overall performance and reliability of the earphone's proximity sensing function.
Implementation Method 1
the sensing cover can reduce the interference of most of the ambient light
Implementation Method 2
the proximity sensing package structure still can sense the reflected light
Data Source
AI summary
This invention provides an earphone with a low light transmittance and a non-porous sensor cover. Covering the sensing cover on the proximity sensing device can reduce the interference of most of the ambient light and improve measurement accuracy.