A recording sheet for use in image forming apparatus, a method and an apparatus for forming an image

摘要

The present invention provides a recording sheet used with an image forming apparatus comprising: an optical functional portion disposed along at least one edge of the recording sheet and arranged asymmetrically with respect to a center of the edge and having a functional feature regarding light different from that of an image forming portion of the recording sheet. Such optical functional portion can be used to provide a machine detectable indication of the surface, being either front or back surface, presented. A compatible image forming apparatus and its operation are described.