Patent ID: 11953838
Assignee: ASML HOLDING N.V.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 26:
27. A method of removing a contaminant from a working surface comprising:
pressing a first cleaning substrate against a first portion of the working surface, the cleaning substrate comprising a base having a lateral surface and a first coating on at least part of the lateral surface including a single raised surface for removing the contaminant and the coating only covering a part of the base and having a lateral size and shape corresponding to a size and shape of the first portion, so that the contaminant transfers from the first portion to the first coating, wherein the working surface comprises a plurality of burls;
moving the first cleaning substrate away from the working surface to remove the contaminant from the first portion of the working surface;
pressing a second cleaning substrate against a second portion of the working surface, the second cleaning substrate comprising a base having a lateral surface and a second coating on at least part of the lateral surface including a single raised surface and having a lateral size and shape corresponding to a size and shape of the second portion, so that the contaminant transfers from the second portion to the second coating, wherein respective remaining parts of the lateral surface of the first cleaning substrate and the lateral surface of the second cleaning substrate are uncoated, and wherein the respective remaining parts are located in an inner portion of a confrontation area with the working surface; and
moving the second cleaning substrate away from the working surface to remove the contaminant from the second portion of the working surface.