Reed sensors in Motor direction changing in Electric Toothbrushes
Electric toothbrushes are designed to make the brush head and bristles move in rapid motions, either in a back-and-forth motion, or in a back and forth motion that also rotates both clockwise and anti-clockwise. The basic design of an electric toothbrush is that the whole working assembly is sealed within a water proof body with an O-ring sealed battery compartment which protects the battery from moisture. Most of the controls for operating the electric toothbrush and turning it on or off require sealed switches that will not be affected by water. This is where ultra-miniature reed switches help. The switches and buttons that are encased in the the rubber body use magnets that trigger the reed switches inside that require multiple presses to change speed and a single short press or a long press of the power button to turn the electric toothbrush on and off. This is achieved by mounting tiny magnets under these buttons that activate or signal cycle the reed switches mounted inside the toothbrush assembly.