FIELD: optics.
SUBSTANCE: device has, serially placed at one optical axis, light source, collimator, ring optical mark forming means and multi-element photo-detector, connected to photo-detector signal processing block, as well as assembly for displacing part along axis. At optical axis before photo-detector ring mark projector is mounted with optical localizer of its position.
EFFECT: broader functional capabilities, higher speed and precision.
5 cl, 5 dwg
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