| 摘要 |
PCT No. PCT/EP98/01484 Sec. 371 Date Jan. 5, 1997 Sec. 102(e) Date Jan. 5, 1997 PCT Filed Mar. 13, 1998 PCT Pub. No. WO98/41955 PCT Pub. Date Sep. 24, 1998The apparatus positions an area on the sheet material, the area being detected with high resolution. For this purpose a reflection device with a plurality of reflectors is provided for deflecting the light emitted by the area of the sheet material in the direction of a sheet material axis in the direction of a detector axis. An adjusting device is used to change the position of at least two reflectors for fixing the position of the area on the sheet material relative to the detection device. The reflectors are disposed so that the length of the optical path of the emitted light from the sheet material to the detection device is equal in the total area of the sheet material and at least in a plurality of positions of the reflection device adjustable by the adjusting device.
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