Patent ID: 11942345
Assignee: APPLIED MATERIALS, INC.
Field: Semiconductors (Electrical engineering)
Classification: CPC H  B  G | IPC B  G  H

Claim 0:
1. A method of centering a substrate in a chamber, comprising:
inserting the substrate into the chamber with a robot arm;
obtaining a delta time value for a second pyrometer relative to a first pyrometer, wherein the delta time value is a duration of time between when the first pyrometer is covered by the substrate and when the second pyrometer is covered by the substrate;
calculating a time offset value of the delta time value relative to an ideal delta time value, wherein the ideal delta time value is the delta time value when the substrate is perfectly centered in a first direction perpendicular to the motion of the substrate;
comparing the time offset value to a graph or a lookup table that correlates the time offset value to a distance offset value, wherein the distance offset value is how far off center the substrate is from being perfectly centered in the first direction;
retracting the substrate;
moving the robot arm by the distance offset value in the first direction; and
inserting the substrate into the chamber with the robot arm.