Data reading apparatus and method,申请号US19980053505-传众专利搜索

Data reading apparatus and method

申请公布号：US6134026(A)

申请号：US19980053505

申请日期：1998.04.01

申请公布日期：2000.10.17

申请人：

CANON KABUSHIKI KAISHA

发明人：WADA, TOSHIHIDE

分类号：H04N1/028;H04N1/04;H04N1/19;H04N1/401;(IPC1-7):H04N1/40

主分类号：H04N1/028

摘要：White reference data can be read regardless of where a white reference sheet traverses an area traversed by a document. This is accomplished by setting the amount A of movement of a carrier, which is for necessary for entering the white reference data, so as to satisfy the condition: D>A>/=D-C+Bwhere B represents amount of movement necessary for the carrier, which mounts a scanner head, to read one item of white reference data, C represents the width of the white reference sheet in the carrier traveling direction, and D represents the width within which the document can be placed.