A fluid ejection system includes a fluid ejection assembly including a plurality of photosensors and a first array of fluid ejection elements. Each of the fluid ejection elements is configured to cause fluid to be ejected when the fluid ejection element is activated. Each one of the photosensors is coupled...http://www.google.de/patents/US7104623?utm_source=gb-gplus-sharePatent US7104623 - Fluid ejection system with photosensor activation of ejection element
