Patent ID: 7239050
Filing Date: 2007-07-03
Classification: G01B,H02K

Abstract:
1. A surface shape measuring apparatus, comprising: a measurement bed in which an object under test is set on; a column which is vertically erected on the measurement bed; a base plate which is vertically movable along the column; a drive unit which moves the base plate vertically along the column; a linear motor which includes a fixed part which is a rod-shaped magnet fixed to the base plate transversely and formed so that the N poles and the S poles are arranged alternately, and a moving part which is a ring-shaped member having a coil member, fitted on said fixed part, and capable of moving along said fixed part, a linear motion guide which is provided parallel to the base plate; a driving section which is slidable in the transverse direction along the linear motion guide, a winding motion transmission support member which is provided near ends of the linear motor; a winding motion transmission member, which is wound around the winding motion transmission support member, that connects the driving section to the moving part or a member fixed to the moving part and thereby transmits driving force of said linear motor to said driving section; and a detecting section which is fixed to the driving section, wherein the surface shape measuring apparatus measures a surface shape of an object under test by relatively moving the detecting section provided on the measurement bed along the surface of the object under test.