Earphone Force-Sensing Housing for Tap-Free Audio Control
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Solution Overview
Problem
Conventional earphones with mechanical input devices are difficult to operate when worn, as users cannot see the devices and tapping to activate them can disrupt audio output and conduct sound, leading to unpleasant experiences and potential microphone interference.
Innovation Solution
The implementation of force-activated earphones that determine non-binary amounts of force applied to a housing using a change in capacitance between first and second force electrodes, with a spring member biasing the first force electrode towards the housing, allowing it to move towards the second electrode when force is applied, enabling activation without external mechanical devices or tapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If mechanical input devices (buttons, dials, switches) are incorporated into earphones, then the earphones can be activated without external devices, but the devices become difficult to operate when worn and may conduct sound disrupting audio output
Solution Approach 1:
The patent replaces mechanical input devices (buttons, dials, switches) with a capacitive sensing system that detects force applied to the housing. The housing itself serves as the input surface, and force electrodes detect changes in capacitance caused by applied force, eliminating the need for separate mechanical components that could conduct sound or interfere with microphones.
Solution Approach 2:
The housing of the earphone serves multiple functions: it provides structural protection, defines the acoustic chamber, and acts as the input surface for force detection. The force electrodes are integrated into the housing structure, allowing the housing to simultaneously serve as both the enclosure and the sensing element, eliminating the need for separate mechanical input devices.
2Ease of operation
If force electrodes are integrated into the housing, then activation can occur without external mechanical devices, but the device complexity increases due to additional sensing components
Solution Approach 1:
The force electrodes are merged with the housing structure, integrating the sensing function directly into the existing enclosure. This consolidation eliminates the need for separate mechanical input devices and reduces overall device complexity while maintaining the ability to detect force input for activation.
3Measurement precision
If the first force electrode is biased towards the housing with a spring member, then the electrode can move towards the second electrode when force is applied, but the device complexity increases due to the spring mechanism
Solution Approach 1:
The spring member provides automatic biasing of the first force electrode towards the housing, creating a self-regulating mechanism that requires no external control. The spring automatically returns the electrode to its initial position after force application, enabling continuous operation without additional complexity.
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 solution allows for efficient activation of earphones by force without tapping, improving power usage and reducing false inputs, while maintaining audio output quality by preventing interference from the user's head or face.
Implementation Method 1
a spring member disposed within the housing biases the first force electrode towards the housing and allows it to move towards the second force electrode when the force is applied
Implementation Method 2
A non-binary amount of a force applied to a force input surface defined by a housing is determinable using a change in a mutual capacitance between first and second force electrodes
Data Source
AI summary
An earphone includes a housing that defines a force input surface opposite a touch input surface. A spring member in the housing includes a first arm that biases a touch sensor toward the touch input surface. The spring member also includes a second arm that biases a first force electrode toward the housing and allows the first force electrode to move toward a second force electrode when a force is applied to the force input surface. A non-binary amount of the force is determinable using a change in a mutual capacitance between the first force electrode and the second force electrode. The mutual capacitance between the first force electrode and the second force electrode may be measured upon detecting a touch using the touch sensor.