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

Claim 12:
13. An etching hard cover for a photo mask manufacturing operation, wherein:
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 side end portion extending transversely from an end of the main cover portion,
at least one dimension of the side end portion is longer than dimensions of the main cover portion such that the side end portion contacts a mask stage of an etching apparatus when the etching hard cover is placed on the mask stage, and
surfaces of the main cover portion and the side end portion facing the photo mask each include a groove configured to receive an O-ring.