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:
Aug. 12, 1997
Filed:
Aug. 21, 1995
Takashi Kasuga, Kanagawa, JP;
Sony Corporation, , JP;
Abstract
This invention provides an alignment method in which alignment correction coefficients are calculated by a method of least squares in reference to the coordinates of each of the alignment marks and the coordinates of the rational grid points, corrected coordinates of the alignment marks from the coordinates of the rational grid points on the basis of the alignment mark correction coefficients and each of their statistical functions are calculated, the differences of these coordinates are calculated, the residuals at each of the alignment marks are calculated in reference to a difference between the alignment displacement tolerance values in the predetermined directions X and Y and their coordinates, and the corrected coordinates of the alignment marks associated with the first pattern for optically exposing the second pattern from the alignment mark correction coefficients and their random number elements when the residual sum of squares becomes a minimum value, thereby the most optimal correction of the alignment can be carried out even in the case that the random elements in the alignment mark displacement components from the rational grid point do not follow a normal distribution.