Patent ID: 7104623
Filing Date: 2006-09-12
Classification: B41J

Abstract:
1. A printing system comprising: a page-wide-array printhead assembly including a plurality of photosensors and a first page-wide-array of ejection elements, each photosensor configured to generate an electrical signal when illuminated, each of the ejection elements configured to cause fluid to be ejected when the ejection element is activated, each one of the photosensors coupled to a respective one of the ejection elements for activating the ejection element; a first light source for emitting a light beam; a control system for scanning the light beam across the printhead assembly and selectively illuminating the photosensors, thereby activating the ejection elements coupled to the illuminated photosensors; and wherein the control system is configured to identify the position of the light beam based on outputs of at least a subset of the plurality of photosensors.