Patent ID: 11906898
Assignee: TAIWAN SEMICONDUCTOR MANUFACTURING COMPANY LTD.
Field: Optics (Instruments)
Classification: CPC G  H | IPC G  H

Claim 6:
7. An etching hard cover for a photo mask manufacturing operation, wherein:
the etching hard cover is a reusable ceramic comprising at least one of boron nitride, crystalline silicon nitride, silicon carbide, zirconia, and barium titanate, or a coating of silicon oxide or silicon nitride,
the etching hard cover has a rectangular frame shape having a rectangular opening and a rectangular frame portion defining the rectangular opening,
the frame portion includes a main cover portion that covers a border region of the photo mask to be manufactured, and
a bottom surface of the main cover portion includes an abutting portion to abut the photo mask, when the etching hard cover is placed on the photo mask, the border region of the photo mask is covered by the etching hard cover such that the etching hard cover is in contact with a light blocking layer disposed at the border region.