| 摘要 |
PURPOSE:To make correction on the carrier error of an optical reader, by providing a mechanism which calculates the correcting value of the carrier error from the optically read results of marks provided on a medium at standard distances and a storage section which stores the correcting value. CONSTITUTION:By depressing a correcting value storage switch 107, a medium 200 for storing correcting value is carried in the direction of the arrow 105 and optically read. Marks 201 and 202 are printed on the medium 200 with a fixed distance between them and an optical reading section 106 carries out reading operations along a reading center line 203. The read results of the section 106 are processed at a control processing section 101. The processing section 101 calculates the optically read number of times until detecting the mark 202 by using the mark 201 in the leading edge section of the medium as a reference position for reading and calculates the carrier error correcting value of this carrier system from the difference between the calculated number of times and a previously calculated standard optically read number of times containing no carrier error. The correcting value thus calculated is stored in a nonvolatile storage section 108 and a carrier error is corrected. Therefore, the accuracy of the optically reading position of this carrier system can be improved without improving its mechanical accuracy.
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