Today’s invention is a simple visor wiper for motorcycle helmets.
There are some unattractive designs inevitably based on conventional car windscreen wipers. Imagine, however, placing a small bristlebot, of the type in the image, on the inside of your visor. This would have embedded in it a piece of ferromagnetic material
The bot is held in place by a rubber-coated magnetic disc on the outside of the visor.
When the bristlebot motor is activated, it will buzz around the inside visor surface, whilst held to that surface by the external magnet. As the bot hits the side of the visor, it changes direction randomly.
The exterior disc thus is moved all over the visor, removing the film of rain from the surface.