Resonant actuator using magnetic action for a power toothbrush

A technology for electric toothbrushes and actuators, applied in electric components, AC motor control, dentistry, etc., can solve the problems of increasing the mechanical stress of the spring, reducing the life of the appliance, and reducing the power output of the appliance

Active Publication Date: 2013-06-05
KONINKLIJKE 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 action for a power toothbrush
  • Resonant actuator using magnetic action for a power toothbrush
  • Resonant actuator using magnetic action for a power toothbrush

Examples

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Embodiment Construction

[0014] figure 1 with 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 circum...

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Abstract

A magnetic actuator system which includes a case (10) and a spindle (22) which extends through the case comprising a magnetizable material such as iron. The actuator further includes a pair of permanent magnet assemblies (14, 16) positioned fixedly within the casing with a longitudinal space there between, wherein the permanent magnet assemblies comprise an alternating plurality of north pole/south magnet sections (18) which extend longitudinally or circumferentially of the actuator. The actuator further includes a coil winding (24) which surrounds the spindle, positioned between the two permanent magnet assemblies. Magnetic pole assemblies (28, 30) attached to the spindle are positioned within the volume encompassed by the permanent magnet assemblies, such that an alternating drive signal produces an oscillating action of the spindle of 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 Applications(China)
IPC IPC(8): A61C17/34H02K33/16H02K33/18
CPCH02K2201/18A61C17/3445H02P25/027H02K33/18H02K33/16A61C17/3418H02P25/032
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 KONINKLIJKE PHILIPS ELECTRONICS NV
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