Patent ID: 6497047
Filing Date: 2002-12-24
Classification: G01B

Abstract:
A flatness measuring equipment, comprising;an elongated member being provided above and parallel to a surface of a planar member to be measured; a movable member being provided to said elongated member and capable of moving along said elongated member; means for measuring distance between said movable member and the surface of said planar member, said measuring means being provided to said movable member so as to measure said distance at positions where said movable member is located; means for emitting a laser beam, at a fixed level, toward said movable member on said elongated member; means for detecting a variation of a level of said movable member with respect of the fixed level of the laser beam; and means for detecting a longitudinal position of the movable member including detecting a longitudinal distance between the movable member and the means for emitting the laser beam by evaluating the laser beam.