In the future, or perhapse you want to change the title now, what you're talking about are uaually refered to as "optical rotary joy" or just "optical rotary" will due just fine also.
The term "optical joy" generally refers to Happ's Perfect 360 which, in case you don't know, is an entirely different beast that uses beams of light instead of microswitches to detect the position of the handle in up to 8 directions.