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Hitachi Ltd
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Hitachi Ltd
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Application filed by Hitachi LtdfiledCriticalHitachi Ltd
Priority to JP10157577ApriorityCriticalpatent/JPS5436754A/en
Publication of JPS5436754ApublicationCriticalpatent/JPS5436754A/en
PURPOSE: To remarkably shorten the detecting time for the optically positioning purpose by providing a stationary sensor having a light receiving element in a perpendicular direction to a rotating laser beam so as to control a movable sensor which is made movable in parallel.