Force-Activated Stylus Capacitance Sensing for Non-Binary Input
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Solution Overview
Problem
Conventional earphones with mechanical input devices are challenging 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 input 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 and controlled, but the devices become harder to operate when worn because users cannot see the input devices and tapping can disrupt audio output and conduct sound
Solution Approach 1:
The patent replaces mechanical input devices (buttons, dials, switches) with a force sensing system that detects applied force through capacitance changes. The force electrodes and spring member create a mechanical-to-electrical transduction system that eliminates the need for visible mechanical components, allowing users to activate earphones through force application without seeing buttons or dials.
Solution Approach 2:
The patent introduces a spring member as an intermediary between the force application point and the force electrode. The spring member transmits the applied force to the electrode while isolating the detection mechanism from direct contact with the external environment, preventing sound conduction while maintaining force sensing capability.
2Ease of operation
If force sensing is implemented using capacitance changes between electrodes, then activation can be achieved without mechanical input devices, but the device complexity increases due to the need for force electrodes and spring members
Solution Approach 1:
The spring member serves multiple functions: it transmits force to the electrode, provides mechanical isolation, enables capacitance change detection, and allows the system to distinguish between different force magnitudes. This multi-functionality reduces the need for separate components for each function, thereby managing complexity while achieving force-activated operation.
3Difficulty of detecting and measuring
If the spring member allows the first force electrode to move towards the second force electrode when force is applied, then force input can be detected through capacitance change, but the precision of force measurement may be affected by the movement mechanism
Solution Approach 1:
The patent utilizes changes in capacitance as a parameter to detect and measure applied force. The spring member's movement alters the capacitance between force electrodes, providing a measurable electrical parameter that correlates with the magnitude of applied force. This parameter change approach enables precise force detection through electrical measurement rather than mechanical positioning.
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 disrupting audio output, improves power usage, and reduces false inputs by distinguishing intentional from accidental force applications, enhancing user experience and battery life.
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 of the earphone is determinable using a change in a mutual capacitance between first and second force electrodes
Data Source
AI summary
A stylus 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.