Method of manufacturing a device and group of masks for this method
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United States of America Patent
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Feb 15, 1994
Issued Date -
N/A
app pub date -
Oct 26, 1992
filing date -
Dec 20, 1989
priority date (Note) -
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Abstract
A method and group of masks for manufacturing a device whereby illumination of a photoresist layer (4) takes place by subsequent illumination through partial masks (1) and 2). During these separate illuminations, complementary scales of grey are obtained in the connection region (7, 8) of the images (5, 6), the total illumination in the connection region (7, 8) being nevertheless complete. According to the invention, good results are obtained when the partial masks (1) and (2) have complementary transparency gradients in the ends (9, 10) corresponding to the scales of grey.
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