Optics: measuring and testing – By alignment in lateral direction – With registration indicia
Reexamination Certificate
2007-04-12
2009-08-18
Chowdhury, Tarifur R. (Department: 2886)
Optics: measuring and testing
By alignment in lateral direction
With registration indicia
Reexamination Certificate
active
07576858
ABSTRACT:
A method for calculating a position of an image of an alignment mark formed on an object to be detected includes the steps of obtaining first information indicative of a center position in the alignment mark based on a detection signal, obtaining a waveform characteristic of the detection signal as second information, and correcting the first information based on the second information that has been obtained, and a measurement error of the center position of the alignment mark, which result from an optical system for detecting the alignment mark.
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Akanbi Isiaka O
Canon Kabushiki Kaisha
Chowdhury Tarifur R.
Rossi Kimms & McDowell LLP
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