Headphone Assembly Pressure Sensor Wearing Detection
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Solution Overview
Problem
Existing headphone wearing detection methods, such as infrared, capacitance, and gravity sensors, face limitations including spatial constraints, complex system loads, and poor recognition rates, leading to unreliable detection results.
Innovation Solution
A headphone assembly incorporating a pressure sensor located in a groove of a speaker board, activated by a trigger element when pressure is applied, allowing for accurate control of functional elements like noise reduction or Bluetooth activation, with a compact design that avoids significant electrical loads and improves detection sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an infrared sensor is used for wearing detection, then detection capability is provided, but the sensor occupies a large area and requires openings in the headphone
Solution Approach 1:
The patent replaces optical sensing mechanisms (infrared sensors) with a mechanical pressure sensing system. The pressure sensor detects wearing through mechanical compression forces applied to the ear pad, eliminating the need for optical components and large openings while achieving reliable wearing detection.
Solution Approach 2:
The patent extracts the sensing function from the traditional optical sensor approach and relocates it to a mechanical pressure detection system. This extraction allows the sensor to be integrated into the ear pad structure without requiring large openings, as the pressure sensor only needs to detect the force applied during wearing.
2Reliability
If a capacitance sensor is used for wearing detection, then detection capability is provided, but complex system load increases temperature interference during long-term wearing
Solution Approach 1:
The patent replaces electrical capacitance sensing with mechanical pressure sensing. This substitution eliminates the electrical system load that generates heat during operation, thereby removing the source of temperature interference while maintaining reliable wearing detection through mechanical force detection.
3Reliability
If a gravity sensor is used for wearing detection, then detection capability is provided, but recognition rate is poor causing unreliable results
Solution Approach 1:
The patent replaces gravity-based detection with direct mechanical pressure detection. The pressure sensor directly measures the force applied to the ear pad during wearing, providing immediate and accurate detection feedback. This mechanical approach eliminates the indirect and less reliable gravity-based inference, achieving high recognition rates.
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 pressure sensor-based system provides reliable and efficient wearing detection with higher sensitivity and accuracy, enabling improved user experience and compact headphone design without compromising performance.
Implementation Method 1
a pressure sensor (12) accommodated in a groove (16) of a speaker board (14)... when detecting that pressure applied by the trigger element (20) reaches a predetermined range, the pressure sensor (12) switches on the switching element (143)
Data Source
AI summary
A headphone assembly, including: a switching element for controlling a switch of at least one functional element in a headphone; a pressure sensor accommodated in a groove of a speaker board; and an ear pad covering the groove, when the ear pad is pressed, a trigger element may be moved to press against the pressure sensor, when detecting that pressure applied by the trigger element reaches a predetermined range, the pressure sensor switches on the switching element, otherwise, the pressure sensor switches off the switching element.