Capacitance Touch Amplitude Control for Oral Care Brushheads
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Solution Overview
Problem
Current oral care appliances, such as power toothbrushes, lack the ability to adjust the amplitude of brushhead movement, which can lead to inadequate cleaning in some areas and potential soft tissue damage in others due to varying gum sensitivity and the inability to change settings during operation.
Innovation Solution
A touch-sensitive amplitude control system that allows users to adjust the amplitude of the brushhead movement by varying their touch on a capacitance-sensing array, with a controller processing this input to modify the drive signal and adjust the brushhead amplitude accordingly, enabling continuous adjustment during use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed amplitude setting is used in the power toothbrush, then the device structure remains simple, but it cannot accommodate different gum sensitivities and mouth regions requiring different brushing intensities
Solution Approach 1:
The patent implements a dynamic amplitude control system where the brushhead amplitude can be adjusted in real-time during operation. A controller receives input from a user interface (buttons, touch screen, or voice recognition) and dynamically modifies the drive signal parameters to change the oscillation amplitude of the brushhead, allowing adaptation to different gum sensitivities and mouth regions while the device is running.
Solution Approach 2:
The system changes the physical parameters of the drive signal (amplitude, frequency, or duty cycle) based on user input to control the brushhead oscillation amplitude. The controller adjusts these electrical parameters to produce different mechanical amplitudes, enabling versatile amplitude control without requiring complex mechanical adjustment mechanisms.
2Ease of operation
If amplitude adjustment capability is added to the power toothbrush, then user comfort and cleaning efficacy improve, but the device complexity and manufacturing cost increase
Solution Approach 1:
The system provides self-service amplitude adjustment through intuitive user interfaces that allow users to independently control the brushhead amplitude according to their needs. The controller processes user input from various interfaces (buttons, touch screens, voice recognition) and automatically adjusts the drive signal parameters, enabling users to customize their brushing experience without requiring professional intervention or complex mechanical adjustments.
Solution Approach 2:
The control system is designed to be universal by supporting multiple input methods (physical buttons, touch screen displays, voice recognition) and multiple output modes (different amplitude levels, pulsing modes). This multi-functional approach allows a single control system to serve various user preferences and requirements, reducing the need for separate specialized components.
3Adaptability or versatility
If the amplitude cannot be changed during operation, then the control system remains simple, but it is impossible to adapt to different mouth regions or address gum sensitivity issues that arise during brushing
Solution Approach 1:
The system implements dynamic real-time amplitude adjustment during brush operation. The controller continuously monitors user input and dynamically modifies the drive signal parameters on-the-fly, allowing the brushhead amplitude to change during brushing sessions to address different mouth regions or gum sensitivity issues that arise during use, without requiring the device to be turned off or restarted.
Solution Approach 2:
The system incorporates feedback mechanisms where the controller receives continuous input from user interfaces (button presses, touch screen selections, voice commands) and adjusts the drive signal parameters accordingly. This closed-loop control enables real-time adaptation to user needs, with the system responding to user feedback by modifying the brushhead amplitude dynamically during operation.
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
Enables users to customize the brushing amplitude over a selected range, accommodating different mouth regions without stopping the appliance, thereby improving cleaning efficacy and reducing the risk of tissue damage.
Implementation Method 1
a capacitance sensor which detects a specific capacitance from the capacitance array produced by a position of a user's finger on the array
Data Source
AI summary
The amplitude control assembly for an oral care appliance includes a capacitance-sensing touch array (26) responsive to the position of a user's touch thereon to change the value of capacitance from the array, as determined by a sensor (30). A control assembly (24), responsive to the change of capacitance, changes an operating characteristic of the drive signal for the appliance, to change the amplitude of motion of a workpiece portion of the oral care appliance.