| 摘要 |
<P>PROBLEM TO BE SOLVED: To precisely detect color shift by a simple and low-cost configuration. <P>SOLUTION: Each patch is constituted of a plurality of lines formed by putting line images Bk in black being a reference color and line images C in a color other than the reference color, for example, cyan, one over the other, and an alignment pattern Pm is constituted by continuously forming patches of which the relative positional relations between line images in two colors are shifted from one another by an arbitrary amount. An alignment pattern detection sensor 40 includes a light emitting diode (LED) 40A and a photo diode (PD) 40B, these elements are disposed along the scanning direction of the alignment pattern Pm, and the photo diode 40B is disposed so as to receive only diffused reflection light of reflected light from the alignment pattern Pm. The spot 40A-1 of the light emitting diode 40A and the spot 40B-1 of the photo diode 40B are formed like squares. <P>COPYRIGHT: (C)2007,JPO&INPIT |
