Earbud Infrared Insertion Sensing for Battery Management
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Solution Overview
Problem
Small and lightweight earbuds have limited battery life due to unintentional power consumption when accidentally powered on or removed from the ear without terminating audio playback, and there is a need for automatic control of audio playback when inserted or removed from the ear.
Innovation Solution
Incorporating infrared (IR) transmitters and receivers in earbuds to detect insertion and removal, allowing for automatic shutdown or pausing of audio playback, and using sensors to manage battery life and enhance user experience by determining if the earbud is in use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If earbuds are made small and lightweight, then comfort and portability are improved, but battery capacity is reduced leading to limited battery life
Solution Approach 1:
The earbud system automatically monitors its own insertion state via infrared sensors and autonomously controls audio playback and power states without user intervention. The system self-manages battery consumption by detecting when earbuds are inserted or removed and automatically pausing or stopping audio playback, eliminating the need for user awareness or manual control.
Solution Approach 2:
The infrared transmitter and receiver create a feedback loop that continuously monitors earbud insertion status. The transmitter emits infrared light and the receiver detects whether the light path is blocked by the user's ear, providing real-time feedback about insertion state that triggers automatic playback control and power management.
2Ease of operation
If automatic playback control is implemented, then user convenience is improved, but device complexity increases due to additional sensors and control circuitry
Solution Approach 1:
The patent replaces mechanical or manual insertion detection methods with an optical infrared detection system. Instead of using mechanical switches, pressure sensors, or complex arrays of detection elements, the system uses infrared light transmission through the ear canal to detect insertion status, simplifying the sensing mechanism while maintaining accuracy.
Solution Approach 2:
The infrared transmitter and receiver serve multiple functions: they detect earbud insertion status, enable automatic playback control, and can potentially be used for other wireless communication purposes. This multi-functionality reduces the need for separate dedicated components for each function.
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
Significantly reduces battery waste by automatically turning off or pausing audio when not in use, improving battery life and enabling features like music control, calls, and virtual personal assistant functions.
Implementation Method 1
an infrared transmitter and an infrared receiver disposed in the earbud
Data Source
Figure 1a~1b
Figure 2a
Figure 2b
AI summary
An earbud includes an infrared light transmitter, an infrared light detector, and a controller configured to provide an indication of insertion of the earbud into an ear of a user responsive to detection of a pattern of signals from the transmitter at the detector.