Patent ID: 6608320
Filing Date: 2003-08-19
Classification: G01B,H01L,H05K

Abstract:
A method for providing a height of a feature on a reflective object, the object situated along an optical axis, the method comprising:projecting light into a line focus, the line focus perpendicular to the optical axis; causing the line focus and the object to relatively move with respect to each other along the optical axis; collecting a first assembled image of the object before the relative movement and substantially sequentially collecting a second assembled image of the object after the relative movement of the line focus and the object, each step of collecting comprising the steps of: 1) capturing a plurality of partial images of the object from a linear detector, as the linear detector and the object move relative to each other in a scan direction; 2) assembling the plurality of partial images into an assembled image of the object; and computing the height of at least one feature as a function of the two assembled images.