Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1992-09-04
1993-06-15
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
356401, G01N 2186
Patent
active
052201767
ABSTRACT:
The apparatus is of the type which detects alignment marks formed on a mask and aligns the mask. The apparatus includes: a plurality of alignment optical systems to detect the plurality of alignment marks formed on the mask in predetermined detection areas; driving means for moving at least a part of the plurality of alignment optical systems in accordance with an arrangement of the alignment marks; and a projecting optical system to project a pattern on the mask onto a photosensitive substrate. In the apparatus, the relative positional relations among the detection areas of the plurality of alignment optical systems on the projection image plane of the projecting optical system are detected, and the position of the detection area of at least one of the plurality of alignment optical systems is corrected independent of the driving means so that the detected relative positional relations are set to predetermined positional relations.
REFERENCES:
patent: 4402596 (1983-09-01), Kanatani
patent: 4616130 (1986-10-01), Omata
patent: 4636626 (1987-01-01), Hazama et al.
patent: 4669867 (1987-06-01), Uda et al.
patent: 4710029 (1987-12-01), Katoh
Le Que T.
Nelms David C.
Nikon Corporation
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