| 摘要 |
A laser scanner employing a reflective polyhedron which is rotatably supported relative to a stator shaft by means of a hydrostatic air bearing. The bearing is constructed to provide at least two axially spaced sets of high-pressure ports and exhaust passages on opposite sides of the ports and including an exhaust passage centrally between the sets of ports so as to effectively decouple the high-pressure regions in the vicinity of the ports and effectively divide the bearing into two portions each of which attains optimum compliance by having an effective length-to-diameter ratio of one.
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