Geometrical instruments – Gauge – Collocating
Reexamination Certificate
2008-01-01
2008-01-01
Fulton, Christopher W (Department: 2859)
Geometrical instruments
Gauge
Collocating
C257S797000, C438S401000, C356S400000
Reexamination Certificate
active
11489896
ABSTRACT:
A surface position measuring method wherein measurement light is obliquely projected onto a substrate surface and on the basis of a position of the detected measurement light and a predetected offset, the position of the substrate surface with respect to a direction of an optical axis of the projection optical system is measured, memorizing a first position of a point on the substrate while using a reference mark provided on a substrate stage, measuring the position of the measurement light as a first measurement position; rotating the substrate by 180 deg. in a plane perpendicular to the optical axis; memorizing a second position of the measurement point on the rotated substrate with reference to the reference mark; measuring the position of the measurement light as a second measurement position; and detecting of the offset at the measurement point on the basis of the first and second measurement position.
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Ina Hideki
Oishi Satoru
Canon Kabushiki Kaisha
Cowan Liebowitz & Latman P.C.
Fulton Christopher W
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