Patent ID: 6901314
Filing Date: 2005-05-31
Classification: H01L

Abstract:
1. An alignment apparatus for substrates, comprising: a first movement mechanism which moves a substrate to be treated in a horizontal direction; a second movement mechanism which moves the substrate in a vertical direction; a rotation mechanism which rotates the substrate in a horizontal plane; an illumination tool to irradiate the substrate with illumination light from a sidewise direction in a state in which the substrate is held in a desired height position by the second movement mechanism; an image sensor which picks up an image on a back surface of the substrate in an irradiated state with the illumination light; an edge position sensor which senses a plurality of edge positions of the substrate from an image obtained by the image sensor; and a control computer which obtains a positional shift of the substrate based on the edge positions sensed by the edge position sensor and which corrects a positional shift of the horizontal direction and a rotation direction by the first movement mechanism and the rotation mechanism.