The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1999
Filed:
Oct. 02, 1996
Ushiodenki Kabushiki Kaisha, Tokyo, JP;
Abstract
To effect exposure of the peripheral area of a wafer to remove an unnecessary resist with a step shape in a development process with high precision and ease, even if the position has errors, in which a circuit pattern is formed on a semiconductor wafer in a preceding process, according to the invention, before exposing the unnecessary resist on a wafer outside of the area on which a pattern is formed, the position of a singular shaped area, such as an 'orientation flat' or the like is determined by a unit for determining the peripheral edge area of the wafer, and the rotating carrier is driven and the wafer is rotated until the singular shaped area is positioned in a predetermined position. Furthermore, according to the invention, a unit for determining the alignment marks computes and stores the positions of predetermined alignment marks, by which positional errors in the location in which the circuit pattern is formed are corrected. Then, the rotating carrier is driven again, and fine adjustment of the position of the exposure area on the wafer is performed.