Capacitive Force-Sensing Stylus for Non-Binary Input Detection
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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 surface 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
1Adaptability or versatility
If mechanical input devices (buttons, dials, switches) are incorporated into earphones, then input functionality is improved, but device complexity and ease of operation deteriorate due to difficulty of operation when worn and inability to see the devices
Solution Approach 1:
The patent replaces mechanical input devices (buttons, dials, switches) with a capacitive sensing system that detects touch and force applied to the housing. The housing itself becomes the input interface through capacitive electrodes that sense user input without requiring visible mechanical components, thus maintaining input functionality while dramatically improving ease of operation when the earphones are worn.
2Adaptability or versatility
If tapping is used to activate earphones, then input functionality is improved, but audio output quality deteriorates due to disruption of audio output and sound conduction
Solution Approach 1:
The patent substitutes mechanical tapping with capacitive force sensing. The capacitive electrodes detect the force and pressure of user input through changes in capacitance values, allowing activation without physical impact. This eliminates the harmful sound conduction and audio disruption caused by mechanical tapping while preserving full input functionality.
3Measurement precision
If force electrodes are moved closer together to increase sensitivity, then measurement precision is improved, but device structure deteriorates due to housing space constraints
Solution Approach 1:
The patent arranges force electrodes in different spatial dimensions and orientations within the housing. By utilizing three-dimensional space and multiple orientations, the system achieves high force detection sensitivity without requiring electrodes to be positioned close together in a single dimension, thus preserving housing structure and space.
4Adaptability or versatility
If multiple force electrodes are added to detect force from multiple directions, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent designs force electrodes that serve multiple functions simultaneously. Each electrode can detect force from multiple directions and can be used for both touch detection and force measurement. This multi-functionality approach enables multi-directional force detection capability while minimizing the total number of electrodes required, thus reducing overall device 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 disrupting audio output, improves power usage, and reduces false inputs by distinguishing intentional force applications from accidental ones, enhancing user experience and battery life.
Implementation Method 1
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
Implementation Method 2
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
Data Source
AI summary
An 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.