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Resonant Actuator Using Magnetic Interaction for Electric Toothbrush

A technology for electric toothbrushes and actuators, applied in dentistry, electrical components, electromechanical devices, etc., can solve the problems of reducing appliance life, increasing mechanical stress of springs, reducing appliance power output, etc.

Active Publication Date: 2016-12-14
KONINK PHILIPS ELECTRONICS NV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, attempting to reduce the size of the actuator and thus the appliance (which is often desirable) will often negatively affect the overall functionality and effectiveness of the appliance, and may reduce the lifetime of the appliance because reducing the resonance The size of the spring generally increases the mechanical stress on the spring, causing earlier failure and reducing the power output of the appliance

Method used

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  • Resonant Actuator Using Magnetic Interaction for Electric Toothbrush
  • Resonant Actuator Using Magnetic Interaction for Electric Toothbrush
  • Resonant Actuator Using Magnetic Interaction for Electric Toothbrush

Examples

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Embodiment Construction

[0014] figure 1 and figure 2 A first embodiment of an actuator 10 is shown which may be used to drive a power toothbrush with a vibrating rotational motion through a selected angle. The actuator 10 includes an elongated cylindrical housing 12 preferably but not necessarily having a small (i.e., thin) diameter of about 12-15 mm, 13.6 mm in the illustrated embodiment. the preferred diameter. Such elongated actuator housings are commercially desirable, and the actuator structures described herein enable such elongated configurations.

[0015] In the illustrated embodiment are two permanent magnet assemblies 14 and 16 located within a housing 12 which is preferably made of a metal with high magnetic permeability since the housing is the magnetic circuit The two permanent magnet assemblies are located near opposite ends of the housing 12 and are attached to the inner surface 15 of the housing 12 . The permanent magnet assembly includes magnet parts 18-18 that alternate circumf...

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PUM

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Abstract

A magnetic actuator system includes a housing (10) comprising a magnetizable material such as iron and a spindle (22) extending through the housing. The actuator also includes a pair of permanent magnet assemblies (14, 16) fixedly disposed within the housing with a longitudinal space therebetween, wherein the permanent magnet assemblies include alternating magnet assemblies extending longitudinally or circumferentially of the actuator. A plurality of north / south magnet assemblies (18). The actuator also includes a coil winding (24) around the main shaft between the two permanent magnet assemblies. A pole assembly (28, 30) attached to the spindle is located within the volume enclosed by the permanent magnet assembly such that alternating drive signals produce vibratory motion of the spindle at a desired frequency and amplitude.

Description

technical field [0001] The present invention relates generally to electric toothbrushes, and more particularly to actuators for electric toothbrushes that utilize magnetic action to generate vibratory output shaft motion having a selected angle of motion and frequency. Background technique [0002] Electric toothbrushes are typically arranged to include a resonant actuator to drive a mechanical spring-mass system, the action of which in turn produces the desired movement of the brush head for cleaning the user's teeth. In a resonant system, the drive frequency of the appliance is set close to or approximately equal to the resonant frequency of the spring-mass system. A resonant system enables the appliance to operate at maximum efficiency for a given power input, and is thus desirable for most appliances, including electric toothbrushes. [0003] The overall size of the actuator and the life expectancy of the appliance are important but sometimes conflicting considerations ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61C17/34H02K33/16H02K33/18
Inventor P·J·巴克斯J·H·B·德维莱斯J·B·R·勒维玲G·韦斯特拉普S·塞塔耶施F·维里杰伯格
Owner KONINK PHILIPS ELECTRONICS NV