Patent ID: 6377866
Filing Date: 2002-04-23
Classification: H01L

Abstract:
A device for engraving an identification mark on a semiconductor wafer, comprising:a table movably supporting a semiconductor wafer; a laser head opposed to said table and engraving the identification mark on the semiconductor wafer supported on said table in accordance with engraving information; an information output engraving device operable to automatically provide adjusted engraving information to the laser head, wherein said adjusted engraving information is based on error information; a reading camera opposed to said table and reading the identification mark on the semiconductor wafer engraved by said laser head as read information; and an information processing device comparing the read information with the engraving information and deriving said error information as a result of said comparison, wherein the engraving operation of said laser head is automatically controlled in accordance with said adjusted engraving information and the engraving operation is automatically stopped if the error information exceeds a predetermined value.