Direct Magnetic Drive Toothbrush Refill for High Frequency Low Noise
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Solution Overview
Problem
Conventional oscillating/rotating toothbrushes are limited in operating frequency due to noise issues and gear systems, which restrict their ability to provide effective cleaning and fluid dynamics at higher frequencies.
Innovation Solution
A toothbrush design with a direct drive system and magnetic attachment between the handle and refill, operating at frequencies between 150 Hz to 175 Hz with reduced noise levels, achieved by eliminating gearing and using a drive system that connects directly to the refill without intermediate components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional oscillating/rotating toothbrushes use gear systems to convert motor rotation, then they can provide oscillating motion, but they are limited in operating frequency due to noise and mechanical constraints
Solution Approach 1:
The patent removes the gear system from the drive train, eliminating the mechanical components that generate noise and limit operating frequency. The motor directly drives the refill without intermediate gearing, allowing operation at higher frequencies (150-175 Hz) with reduced noise levels (less than 75 dB(A)).
Solution Approach 2:
The patent replaces the mechanical gear conversion system with a direct magnetic drive system. The motor's magnetic field directly interacts with the refill's magnetic elements, eliminating mechanical gears and enabling higher frequency operation with reduced mechanical noise.
2Productivity
If conventional oscillating/rotating toothbrushes operate at higher frequencies, then cleaning efficiency would improve, but noise levels increase significantly
Solution Approach 1:
By removing the gear system, the patent eliminates the primary noise source that prevents high-frequency operation. This allows the brush to operate at 150-175 Hz for improved cleaning efficiency while maintaining noise levels below 75 dB(A).
Solution Approach 2:
The patent changes the operating parameters by eliminating mechanical constraints, enabling operation at higher frequencies (150-175 Hz compared to conventional 40-100 Hz) with correspondingly reduced noise levels, achieving both improved productivity and reduced harmful factors.
3Speed
If conventional toothbrushes use gearing to convert rotational motion, then they can control oscillation amplitude, but they cannot achieve frequencies greater than 100 Hz
Solution Approach 1:
The patent extracts and removes the entire gear conversion system from the drive train, simplifying the device architecture. The direct magnetic drive eliminates complex mechanical conversions, enabling frequencies greater than 100 Hz with reduced structural complexity.
Solution Approach 2:
The patent replaces the mechanical gear conversion system with a direct magnetic field interaction system. This substitution eliminates the need for complex mechanical components while achieving the desired oscillation frequencies and simplifying the overall device structure.
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 design allows for improved cleaning efficiency and reduced noise, maintaining effective tip speeds of at least 1.5 m/s while producing sound intensity levels of less than 75 dB(A), enhancing user experience and cleaning effectiveness.
Implementation Method 1
The attachment element comprise a permanent magnet or a magnetisable material
Data Source
AI summary
A personal care device having a handle having an engagement portion and a persona care attachment are described. The personal care attachment has a housing attached to the engagement portion and a contact element carrier. The contact element carrier is movably coupled to the housing. A plurality of contact elements is arranged on the contact element carrier, and wherein the personal care attachment is driven at a frequency of between about 150 Hz to about 175 Hz and has a sound intensity level of less than about 75 dB(A).