Changing amplitude of movement by changing the drive frequency of a toothbrush brushhead
US7979938B2 · kind B2 · utility
11Cited by
7References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 9, 2004 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Feb 16, 2027 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61C17/32
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The drive system drives a brushhead at a driving frequency. The drive system includes a frequency modulation system which changes. the driving frequency about a center frequency in such a manner, with selected frequency deviation and modulation frequency, which interacts with the resonance of the brushhead to produce a change of amplitude in the movement of the brushhead within a range of 5-30%.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.