Patent ID: 7938531
Filing Date: 2011-05-10
Classification: B41J,H04N

Abstract:
1. A handheld printer to be manipulated back and forth by an operator over a media during use to print an image on the media, comprising: a hand maneuverable housing for the operator; an inkjet printhead on or in the housing to print the image; a controller communicating with the printhead to cause printing or not; a position sensor for directing light at the media and communicating with the controller to provide a location of the printhead during use, an output of the position sensor providing information indicating a current location of the housing and over time a previous location of the housing; a reducer for altering a relative size of the output of the position sensor into a reduced current location and a reduced previous location, wherein the reducer twice alters the relative size of the previous location to obtain the reduced previous location but only once alters the relative size of the current location to obtain the reduced current version; and a comparator to compare the reduced current location to the reduced previous location and find the reduced previous location in the reduced current location, wherein the controller ascertains a relative location of the printhead to the image upon finding the reduced previous location in the reduced current location.