How it works: electric toothbrush

electric toothbrush for dummiesElisa Bagein

Today

Sonic toothbrushTypes

Rotating toothbrush (oscillating)Types

ToothbrushBraunRotating toothbrush

Whats inside a toothbrush?

Whats inside a toothbrush?Exploded view

The coilIs a part of the transformerTransformer: makes the toothbrush can recharge its batteries without any metal contact between the recharger and the toothbrush.

batteries

Rechargable batteriesStore the energy from the transformerNI-MH-batteries - high energy density- less memory effect than NiCad3V

MotoRDC-motorConverts electric fluxinto mechanical movement

Cam and Gears

Converts rotation (from the motor) into an oscillating movement

Cam and Gears

Cam and Gears

Brush head inside

MaterialsOuter caserubberrubber => for grip, elasticABS=> high thixotropy

MaterialsBrushhead: ABSBristles: nylon and rubberGears: POM=> great fabricability=> precise tolerance on dimensionsHolder parts: POM=> very strong but also resilient/elastic

How it works