| 摘要 |
<p>The invention relates to a device and a method of positioning an object with respect to a plane.
- the said plane is scanned by the axis of a light beam (6') between a source assembly (5-8) and a detection assembly (11-13),
- the object (1) is translated approximately perpendicularly to the said plane,
- the signal received is measured as a function of time,
- the translation of the object (1) is halted when the received signal has a particular shape.
<??>The sought after particular shape of the received signal corresponds to the position of the object (1) in which the shoulder (4) obscures a predetermined fixed portion of the light beam (6') during part of the scanning of the light beam.
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