Patent ID: 9099508
Filing Date: 2015-08-04
Classification: H01L

Abstract:
1. A method for automatic measurement and for recording of location positions of objects having a curved contour within a substrate processing system by moving a sensor carrier by means of a robot grab in that sensor units of the sensor carrier are moved along straight movement lines across edges of the object, each of the sensor units outputting at least one sensor signal which changes its value upon detection of an edge, and by determining from the positions of the signal changes along the respective straight movement lines, a location position of the object, the method comprising the step of determining a center of the curved contour by moving at least one sensor along a first straight movement line across an edge forming the curved contour, wherein the at least one sensor outputs a first sensor signal which changes its value upon detection of the edge, setting up a second straight movement line by subsequently parallel displacing the first straight movement line, moving the at least one sensor along the second straight movement line across the edge wherein the at least one sensor outputs a second sensor signal which changes its value upon detection of the edge, calculating a position difference of the first and the second signal change, calculating from the position difference a new straight movement line which is parallel displaced with respect to the second straight movement line, and moving the at least one sensor along the new straight movement line, and repeating the calculation of the position difference of the last and the second last signal change, the calculation of the new straight movement line, and the moving of the at least one sensor along the new straight movement line until the position difference of the last two signal changes along the new straight movement line lies below a specified threshold, and calculating from the positions of these last two signal changes the center of the curved contour.