| 摘要 |
A sheet thickness detection apparatus is provided for detecting the thickness of a sheet document on a document transport path. The apparatus comprises: a first detector unit having a sheet document contact point adjacent the document transport path, the detector unit comprising a piezoelectric element, a first portion of the piezoelectric element being fixed relative to the document transport path, and the piezoelectric element being arranged such that contact between a sheet document and the sheet document contact point as a sheet document passes the detector unit along the document transport path causes flexing of a second portion of the piezoelectric element relative to its first portion; and a sensing circuit connected to the piezoelectric element for outputting an electric signal based on the charge generated by the piezoelectric element upon flexing, the outputted signal being related to the thickness of the sheet document. A corresponding method is also provided. |
