专利名称：Optical sensor for plotter pen verification发明人：Robert W. Beauchamp,Isidre R. Martos,Luis F.
Granda
申请号：US07/763098申请日：19910920公开号：US05170047A公开日：19921208
摘要：An optical sensor for monitoring plotter pen performance by sensing thequality of lines drawn on a medium. An LED emitting green light beam is angularlydirected toward an underlying line so as to reflect into an optical sensor which measuresthe print contrast ratio of a point on the line. Circuit means amplifies and filters the signalgenerated by the optical sensor.
申请人：HEWLETT-PACKARD COMPANY
代理人：David S. Romney
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