| 摘要 |
PURPOSE:To improve the reading position precision by installing a mechanism for correcting the transport error from the optically readed results for the marks on a medium which keeps a standard distance. CONSTITUTION:Marks 201 and 202 are printed, keeping a prescribed interval, onto a medium, and an optical reading part 106 performs reading operation along a reading center line 203, and the results are memorized into the memory part 108 in a control processing part 101. A control processing part 101 searches the optically readed results memorized into the memory part 108 and detects the mark 201 at the head part of the medium, and sets said mark as a reading standard position. Then, the mark 202 is detected by searching the vicinity of the standard position on the optically readed results of the mark 202, and the number of times of optical reading ranging from the mark 201 and 202 is calculated, and the transport quantity error in the reading at this time is calculated from the difference between the number of times of standard optical reading which is previously calculated, and the transport quantity error is corrected according to said error. Thus, the precision for the optical reading position is improved.
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