Patent ID: 6115117
Filing Date: 2000-09-05
Classification: G01N

Abstract:
A method for inspecting a surface of an object to be measured, comprising the steps of:projecting a light beam from a light source on the surface of the object by means of an optical system;sensing a scattered light beam reflected from the surface of the object;sensing a mirror-reflected light beam mirror-reflected from the surface of the object when the object is irradiated by said irradiating optical system;moving the object relative to the optical system;inspecting a foreign matter on the surface of the object;detecting a height of the object from the mirror-reflected light beam; andrecording position coordinates of the foreign matter, wherein the height of the object is measured so as to produce a height signal of the object when the foreign matter on the surface of the object is inspected, and then the position coordinates of the foreign matter are corrected on the basis of the height signal of the object without adjusting the object.